CN108801870B - The experimental provision and method of reservoir rock imbibition under a kind of analog formation condition - Google Patents
The experimental provision and method of reservoir rock imbibition under a kind of analog formation condition Download PDFInfo
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- CN108801870B CN108801870B CN201810250602.0A CN201810250602A CN108801870B CN 108801870 B CN108801870 B CN 108801870B CN 201810250602 A CN201810250602 A CN 201810250602A CN 108801870 B CN108801870 B CN 108801870B
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- 239000011435 rock Substances 0.000 title claims abstract description 111
- 238000005213 imbibition Methods 0.000 title claims abstract description 56
- 230000015572 biosynthetic process Effects 0.000 title claims abstract description 47
- 238000000034 method Methods 0.000 title claims abstract description 25
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 94
- QSHDDOUJBYECFT-UHFFFAOYSA-N mercury Chemical compound [Hg] QSHDDOUJBYECFT-UHFFFAOYSA-N 0.000 claims abstract description 71
- 229910052753 mercury Inorganic materials 0.000 claims abstract description 71
- 238000002347 injection Methods 0.000 claims abstract description 47
- 239000007924 injection Substances 0.000 claims abstract description 47
- 238000010521 absorption reaction Methods 0.000 claims abstract description 38
- 238000004088 simulation Methods 0.000 claims abstract description 34
- 238000001035 drying Methods 0.000 claims abstract description 14
- 239000012530 fluid Substances 0.000 claims description 15
- 238000010998 test method Methods 0.000 claims description 10
- 230000001133 acceleration Effects 0.000 claims description 6
- 230000005484 gravity Effects 0.000 claims description 6
- 238000013016 damping Methods 0.000 claims description 5
- 238000012360 testing method Methods 0.000 claims description 3
- 238000005259 measurement Methods 0.000 abstract description 22
- 238000002474 experimental method Methods 0.000 description 16
- 239000007788 liquid Substances 0.000 description 16
- 239000007789 gas Substances 0.000 description 13
- 230000008569 process Effects 0.000 description 9
- 239000013505 freshwater Substances 0.000 description 8
- 230000002269 spontaneous effect Effects 0.000 description 8
- 238000006073 displacement reaction Methods 0.000 description 7
- 230000035699 permeability Effects 0.000 description 7
- 239000012634 fragment Substances 0.000 description 6
- 238000010586 diagram Methods 0.000 description 5
- 238000011160 research Methods 0.000 description 5
- 238000007796 conventional method Methods 0.000 description 4
- 238000011156 evaluation Methods 0.000 description 4
- 239000011521 glass Substances 0.000 description 4
- 230000008859 change Effects 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- 230000000087 stabilizing effect Effects 0.000 description 3
- 239000004575 stone Substances 0.000 description 3
- 238000004458 analytical method Methods 0.000 description 2
- 239000004927 clay Substances 0.000 description 2
- 230000006378 damage Effects 0.000 description 2
- 238000001514 detection method Methods 0.000 description 2
- 230000008595 infiltration Effects 0.000 description 2
- 238000001764 infiltration Methods 0.000 description 2
- 230000007246 mechanism Effects 0.000 description 2
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 description 2
- 238000012351 Integrated analysis Methods 0.000 description 1
- 208000027418 Wounds and injury Diseases 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000000903 blocking effect Effects 0.000 description 1
- 238000005056 compaction Methods 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 230000007812 deficiency Effects 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 238000005553 drilling Methods 0.000 description 1
- JEGUKCSWCFPDGT-UHFFFAOYSA-N h2o hydrate Chemical compound O.O JEGUKCSWCFPDGT-UHFFFAOYSA-N 0.000 description 1
- 208000014674 injury Diseases 0.000 description 1
- 238000009533 lab test Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 239000003345 natural gas Substances 0.000 description 1
- 238000011084 recovery Methods 0.000 description 1
- 238000005070 sampling Methods 0.000 description 1
- 238000007789 sealing Methods 0.000 description 1
- 230000003068 static effect Effects 0.000 description 1
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N15/00—Investigating characteristics of particles; Investigating permeability, pore-volume or surface-area of porous materials
- G01N15/08—Investigating permeability, pore-volume, or surface area of porous materials
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N15/00—Investigating characteristics of particles; Investigating permeability, pore-volume or surface-area of porous materials
- G01N15/08—Investigating permeability, pore-volume, or surface area of porous materials
- G01N2015/0866—Sorption
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- General Health & Medical Sciences (AREA)
- General Physics & Mathematics (AREA)
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- Investigating Strength Of Materials By Application Of Mechanical Stress (AREA)
- Investigation Of Foundation Soil And Reinforcement Of Foundation Soil By Compacting Or Drainage (AREA)
Abstract
The present invention provides the experimental provisions and method of reservoir rock imbibition under a kind of analog formation condition.The experimental provision includes baking oven, and oven interior is provided with drying room and measuring chamber；High pressure core holding unit is provided in measuring chamber, one end of high pressure core holding unit is connect with sink pipeline, is disposed with water pump and first pressure gauge between sink and high pressure core holding unit；The other end of high pressure core holding unit is connect with mercury pipeline, and the high-precision pressure gauge that precision is 0.1% is provided between high pressure core holding unit and mercury tube；Confining pressure injection hole is offered on the side wall of high pressure core holding unit, confining pressure injection hole is connect with confining pressure injection pump pipeline, is provided with second pressure gauge between confining pressure injection hole and confining pressure injection pump.The experimental provision realize core temperature environment under formation condition, in confining pressure environment and gap pressure flow body environment controllable simulation, make the measurement result of rock core water absorption closer to actual conditions.
Description
Technical field
The invention belongs to oil-gas field development technical field, it is related to a kind of reality of reservoir rock imbibition under analog formation condition
Experiment device and method.
Background technique
Constantly verifying and experimentally developing with unconventional gas resource, for the research of unconventional gas resource
It is deepening continuously.Currently, evaluating the spontaneous imbibition of reservoir rock when studying compact reservoir, especially clay shale with low permeability gas reservoir
Intensity is one of the emphasis of research.Firstly, since low permeability reservoir hole throat is small, spontaneous imbibition phenomena is more than conventional reservoir
Obviously, capillary force caused by the effect can have a huge impact reservoir.Secondly, low permeability reservoir is to Different Strata or manually
The suction capacity of the liquid of injection is different, and needs assessment Different Strata or the liquid being artificially injected hurt the reservoir of low permeability formation
Evil.Again, the universal heterogeneity of low permeability reservoir is stronger, during developing shale gas, needs to Different Strata under well section or same
The shale of one stratum different location carries out repeatedly sampling evaluation.
From the point of view of engineering viewpoint, carried out in fracturing work for reservoir, fracturing fluid recovery (backflow) rate is closed in fracturing work
One of numerous emphasis parameters of note.Conventional pressure break returns the halfway mechanism study of row, main to consider that high pressure caused by pressure break makes
Fracturing fluid enters after the seam of stratum, is acted on by hole throat trapping and partial open liquid is trapped in rock.In hyposmosis
In Gas Reservoir, especially clay shale with low permeability gas reservoir, since blowhole throat is narrow, hollow billet effect is obvious.Even if pressure break
When there is no high pressure, fracturing fluid can also be entered in rock by spontaneous imbibition effect.How research, which evaluates the spontaneous imbibition of liquid, enters
This phenomenon of rock can provide basic research to the injury analysis of natural gas reservoirs for fracturing work, also be low permeability gas reservoir
Fracturing fluid design provides guidance instruction.
Currently, the laboratory test of studies in China imbibition mainly utilizes weight method, i.e., by the way that rock sample is processed into Standard rock sample
Afterwards, rock sample is placed in closed core barrel, measures the water suction situation of rock.It will soak in core barrel in general, and
The glass tube of the height of water can be measured in a termination one of cylinder, is then monitored for glass level of the liquid in the tube.When
Liquid level decline after rock sample water suction, in glass tube.It is changed with time by recording liquid level falling head, and passed through again
The product of glass tube cross-sectional area and liquid level falling head, the quality for calculating rock sucking water change with time.The method is adopted
Experimental provision has the following deficiencies: that (1) experimental provision can not simulate in rock water absorption course under simulation stratum condition
Rock core has the formation condition of confining pressure, and experimentation is caused to differ greatly with actual conditions；(2) experimental provision can only realize measurement
The experiment of the spontaneous imbibition of rock core, can not under simulation stratum condition rock core stitch in fluid have pressure in the case where rock water suction feelings
Condition (3) device is easy to be influenced to acquire experimental data by temperature and human factor in liquid level experiment data read process
Great error is caused, the accuracy of experimental result is reduced, and tries that posterior information is single rationally cannot really to explain infiltration
Mechanism is inhaled, there is significant limitation；(4) experimental provision is in the experimentation of measurement rock water absorption, due to rock sheet
Body may have part resid vol during the displacement of reservoir oil is dried to be existed, thus cannot be guaranteed that measured water absorption is entirely
The quality of water.
Therefore, it is necessary to invent a kind of equipment, the equipment can quickly, it is easy, maximize reservoir rock under simulation stratum condition
The spontaneous imbibition ability of the shale gas reservoir rock of Different Strata or same stratum different location is economically evaluated in the imbibition of stone.
Summary of the invention
The shortcomings that in view of the above-mentioned prior art, the purpose of the present invention is to provide reservoir rocks under a kind of analog formation condition
The experimental provision and method of stone imbibition.The experimental provision can simulate reservoir rock under the formation condition of different confining pressures, different temperatures
The water suction situation and water absorption of stone imbibition.This method can be avoided in liquid level experiment data read process, temperature and it is artificial because
Element causes great error.
In order to realize aforementioned invention purpose, the present invention provides a kind of realities of reservoir rock imbibition under analog formation condition
Experiment device, the experimental provision include baking oven, and the oven interior is provided with drying room and measuring chamber；
High pressure core holding unit is provided in the measuring chamber, one end of the high pressure core holding unit and sink pipeline connect
It connects, is disposed with water pump and first pressure gauge between the sink and high pressure core holding unit；
The other end of the high pressure core holding unit is connect with mercury pipeline, the high pressure core holding unit and mercury tube
Between be provided with precision be 0.1% high-precision pressure gauge；
Confining pressure injection hole, the confining pressure injection hole and confining pressure injection pump are offered on the side wall of the high pressure core holding unit
Pipeline connection, is provided with second pressure gauge between the confining pressure injection hole and confining pressure injection pump；
The drying room provides heat to the measuring chamber, the temperature environment of rock core under simulation stratum condition；
The water pump is filled the water with setting pressure core sample into the high pressure core holding unit, rock under simulation stratum condition
The fluid environment of the heart；
Confining pressure injection pump core sample into the high pressure core holding unit applies pressure, rock under simulation stratum condition
The confining pressure environment of the heart.
According to a particular embodiment of the invention, it is preferable that the mercury tube includes U-shaped mercury tube or L-type mercury tube.The U
Type mercury tube or L-type mercury tube can be placed in a fixed device, keep stablizing.It is the high-precision of 10kPa in conjunction with range
The fine measurement of pressure gauge and the detection of U-shaped mercury tube are spent, the measurement accuracy of core sample water absorption can achieve 1mg or more,
In conjunction with the detection of high-precision pressure gauge and L-type mercury tube that range is 10kPa, the measurement accuracy of core sample water absorption can reach
To 20mg or more, and there is the ground environment of hydraulic pressure in the suitable simulation core sample one end of U-shaped mercury tube, and L-type mercury tube is suitble to simulate
There is the ground environment of hydraulic pressure at core sample both ends, i.e., U-shaped mercury tube is suitble to simulate unidirectional imbibition process, and L-type mercury tube is suitble to mould
Intend two-way imbibition process.
The experimental provision of reservoir rock imbibition, can use high-precision pressure gauge and finely surveys under above-mentioned analog formation condition
The pressure value of mercury tube calculates mercury liquid level in mercury tube then by static pressure equation Δ P=ρ g Δ h when measuring pressure stabilizing
Change in displacement calculates the water absorption of core sample indirectly, avoids in conventional method and directly read in conjunction with the caliber of mercury tube
Liquid level data in the mobile displacement of U-tube mercury or L-type pipe and caused by artificially read data error, substantially increase reality
The measurement accuracy tested.In addition, generating hot gas by the drying room in baking oven, and heat is provided to measuring chamber, realizes stratum item
The controllable simulation of core temperature environment under part；Controllably apply confining pressure to core sample by confining pressure injection pump, and passes through water pump
It is filled the water with setting pressure core sample into high pressure core holding unit, realizes under formation condition that fluid has pressure ring in rock core gap
The controllable simulation in border, makes measurement result closer to actual conditions, and by the way of controlling pressure into high pressure core holding unit
Core sample water filling can further be discharged oil that may be remaining in rock core, be further ensured that the accuracy of experimental result.
According to a particular embodiment of the invention, it is preferable that the high pressure rock core aid device includes outer cylinder shell, the outer cylinder
Enclosure interior is nested with rock core seal sleeve, and outer cylinder shell both ends are respectively arranged with closure plug, and the rock core seals
Filter disc is respectively arranged between sleeve both ends and the closure plug, it is equal that the rock core seal sleeve inner wall is provided with a circle thickness
Even rubber sheet gasket forms ring and presses chamber between the outer cylinder shell and the rock core seal sleeve.
According to a particular embodiment of the invention, it is preferable that the high pressure core holding unit can be born under the conditions of 10 DEG C -40 DEG C
The confining pressure of 0-20MPa.
According to a particular embodiment of the invention, it is preferable that the confining pressure injection hole is provided with the side wall of the outer cylinder shell
On, the confining pressure injection pump presses chamber to inject confining pressure by the confining pressure injection hole to the ring.
According to a particular embodiment of the invention, it is preferable that the confining pressure injection pump is hand pump；The aperture of the filter disc is
10-20 mesh.It is highly preferred that the hand pump is hand fresh water pump.
According to a particular embodiment of the invention, it is preferable that between the high pressure core holding unit and the first pressure gauge
It is provided with the first valve, the second valve, the high pressure rock core are provided between the confining pressure injection hole and the second pressure gauge
Third valve is provided between clamper and the high-precision pressure gauge.In use water pump constantly to core sample the injecting process
In, the gas expanded in crack and hole in core sample, which is urged, produces by boasting, and the expanding gas produced by boasting passes through conduit water of compaction
Mercury in silver-colored pipe makes mercury liquid level generate displacement, forms pressure, is all urged and being produced by boasting when the expanding gas in core sample
Afterwards, core sample reaches maximum water absorption, and infiltration experiment terminates, and extra water can pass through pipeline flow-direction mercury in core sample
Therefore pipe third valve is arranged before high-precision pressure gauge, can prevent water from entering high-precision pressure gauge in time, be also prevented from water
Travel further into mercury tube, equally, the first valve be set between high pressure core holding unit and first pressure gauge, can with and time control
The circulation and blocking of water flow processed, are arranged the second valve between confining pressure injection hole and second pressure gauge, can prevent water from entering the
Two pressure gauges, damage second pressure gauge.
According to a particular embodiment of the invention, it is preferable that the baking oven bottom is provided with damping device.The damping device can
Think the common damping device in this field, facilitates the experimental provision of reservoir rock imbibition under the analog formation condition of body structure
It can carry as a whole, can adapt to situ of drilling well complex environment, it is simple and practical, facilitate in-site measurement to analyze while ensure that
The precision of measurement data.
According to a particular embodiment of the invention, it is preferable that the first pressure gauge, high-precision pressure gauge and second pressure gauge
It is digital display manometer.
According to a particular embodiment of the invention, it is preferable that the range of the high-precision pressure gauge is 10KPa-30MPa, institute
The range for stating first pressure gauge is 10KPa-30MPa；The range of the second pressure gauge is 10KPa-30MPa.
The present invention also provides the test method of the experimental provision of reservoir rock imbibition under above-mentioned analog formation condition,
The following steps are included:
Step 1: being prepared by a conventional method core sample, is packed into be measured in high pressure core holding unit；
Step 2: adjusting oven temperature, the temperature environment of rock core under simulation stratum condition；Then using confining pressure injection pump to
Core sample applies pressure in the high pressure core holding unit, the confining pressure environment of rock core under simulation stratum condition；Subsequent start-up water
Water injection pressure core sample water filling into the high pressure core holding unit to set is pumped, the fluid of rock core under simulation stratum condition
Environment；
Step 3: the pressure value that high-precision pressure gauge measures is recorded at set time intervals, until the high-precision pressure
Power table shows steady pressure；
Step 4: the water pump, confining pressure injection pump are closed, and the rock core under each time interval is calculated according to formula (1)
The water absorption of sample,
In the formula (1), Δ Q indicate time interval in the core sample water absorption, unit be gram, Δ P indicate
The pressure value that the high-precision pressure gauge measures in time interval, unit Pa, ρ1It indicates in oven temperature and confining pressure pressure strip
The density that part is lauched, unit g/cm3, ρ2Indicate the density of the mercury under oven temperature and confining pressure pressure condition, unit g/
cm3, d is the diameter of mercury tube, and unit cm, g are acceleration of gravity.
According to a particular embodiment of the invention, it is preferable that the test method further includes between calculating the time according to formula (2)
Every the rate of water absorption of the interior core sample,
In the formula (2), Δ V indicates that the rate of water absorption in time interval, Δ t indicate time interval.
According to a particular embodiment of the invention, it is preferable that the test method further includes being calculated according to formula (3) or (4)
The water suction total amount of the core sample,
In the formula (3), Q indicates the water suction total amount of the core sample, and unit is gram that P indicates the high-precision pressure
The steady pressure that power table is shown, unit Pa, ρ1Indicate the density being lauched in oven temperature and confining pressure pressure condition, unit g/
cm3, ρ2Indicate the density of the mercury under oven temperature and confining pressure pressure condition, unit g/cm3, d is the diameter of mercury tube, single
Position is cm, and g is acceleration of gravity；
In the formula (4), Δ QiIndicate the water absorption of the core sample in i-th of time interval, unit is gram k
Indicate time interval number.
In formula (1) and formula (2), ρ1And ρ2It can be obtained by looking into the density meter of corresponding water and mercury, generally,
ρ1Take 1g/cm3, ρ2Take 13.60g/cm3, g takes 9.8N/m3。
According to a particular embodiment of the invention, it is preferable that the test method further includes in different oven temperatures, confining pressure
Under pressure and water injection pressure the step of testing rock core sample water absorption.After the imbibition measurement experiment for terminating core sample, close
Second and third valve, it switches off the pump, confining pressure injection pump, high-precision pressure gauge is reset and etc..Then measurement experiment is obtained
The data obtained carry out comprehensive analysis and evaluation.
Compared with prior art, the experimental provision of reservoir rock imbibition and side under analog formation condition provided by the invention
Method has the advantages that
(1) under analog formation condition provided by the invention reservoir rock imbibition experimental provision, realize formation condition
The controllable simulation of pressure flow body environment, makes the measurement result of rock core water absorption in lower core temperature environment, confining pressure environment and gap
Closer to actual conditions；
(2) under analog formation condition provided by the invention reservoir rock imbibition experimental provision, reached using precision
The pressure value of mercury tube, avoids and directly reads U-tube in conventional method when 0.1% high-precision pressure gauge finely measures pressure stabilizing
Liquid level data in the mobile displacement of mercury or L-type pipe and caused by artificially read data error, substantially increase experiment
Measurement accuracy；
(3) under analog formation condition provided by the invention reservoir rock imbibition method, utilize analog formation condition
The experimental provision of lower reservoir rock imbibition realizes core temperature environment under formation condition, pressure flow in confining pressure environment and gap
The controllable simulation of body environment；The pressure that mercury tube is finely measured by high-precision pressure gauge utilizes public affairs in conjunction with the diameter of mercury tube
Formula calculates the water absorption of core sample, rate of water absorption in certain time period indirectly, avoids artificial reading mercury tube liquid level number
According to error, substantially increase the measurement accuracy of experiment；
(4) under analog formation condition provided by the invention reservoir rock imbibition method, can be with analog study core sample
Water absorption changes with time relationship product under formation conditions, has in the rock core water suction phenomenon of confining pressure from, further analyzes
Core sample rate of water absorption, capillarity phenomenon and water absorption；In addition, experimental provision provided by the invention and method can be used for mould
After quasi- research purpose layer fracturing work, fracturing fluid enters the spontaneous imbibition phenomena generated in reservoir.
Detailed description of the invention
Fig. 1 is the structural schematic diagram of the experimental provision of reservoir rock imbibition under 1 analog formation condition of embodiment；
Fig. 2 is the structural schematic diagram of 1 experimental provision mesohigh core holding unit of embodiment；
Fig. 3 is the partial cross-section sectional view of 1 high pressure core holding unit of embodiment；
Fig. 4 is U-shaped mercury tube structural schematic diagram in 1 experimental provision of embodiment；
Fig. 5 is L-type mercury tube structural schematic diagram in 1 experimental provision of embodiment.
Symbol description:
1 baking oven, 101 temperature detect switch (TDS)s, 102 display screens,
10 drying rooms, 20 measuring chambers,
201 sinks, 202 water pumps, 203 first pressure gauges, 204 high pressure rock cores accommodate device, and 205 second pressure gauges, 206 is hand
Fresh water pump, 207 high-precision pressure gauges, 208 mercury tubes；
41 outer cylinder shells, 42 rock core seal sleeves, 43 closure plugs, 44 filter discs, 45 rubber sheet gaskets, 46 core samples, 47
Ring presses chamber, 48 confining pressure injection holes.
Specific embodiment
In order to which technical characteristic of the invention, purpose and beneficial effect are more clearly understood, now to skill of the invention
Art scheme carries out following detailed description, but should not be understood as the restriction to enforceable range of the present invention.
Embodiment 1
Present embodiments provide a kind of experimental provision of reservoir rock imbibition under analog formation condition, structure such as Fig. 1
Shown, which includes baking oven 1, and the outer surface of baking oven 1 is provided with temperature detect switch (TDS) 101 and display screen 102, is surveyed to show
The real time temperature in room 20 is measured, oven interior is provided with drying room 10 and measuring chamber 20；
High pressure core holding unit 204, the input end and sink 201 of high pressure core holding unit 204 are provided in measuring chamber 20
Pipeline connection, is disposed with water pump 202 and first pressure gauge 203 between sink 201 and high pressure core holding unit 204；High pressure
The outlet end of core holding unit 204 is connect with 208 pipeline of mercury tube, and mercury tube 208 can be placed in stable fixation device, high
The high-precision pressure gauge 207 that precision is 0.1% is provided between pressure core holding unit 204 and mercury tube 208；The clamping of high pressure rock core
Confining pressure injection hole 48 is offered on the side wall of device 204, confining pressure injection hole 48 is connect with hand 206 pipeline of fresh water pump, confining pressure injection
Second pressure gauge 205 is provided between hole 48 and hand fresh water pump 206；Drying room 10 provides heat, simulation ground to measuring chamber 20
The temperature environment of rock core under the conditions of layer；Water pump 202 is filled the water with setting pressure core sample into high pressure core holding unit 204, shape
At the fluid environment for the rock core for having certain imbibition displacement pressure under simulation stratum condition；Hand fresh water pump 206 is infused by confining pressure
Enter outer cylinder shell 41 of the hole 48 into high pressure core holding unit 204 and squeeze into water between rock core seal sleeve 42, promotes sealing shroud
Cylinder inwardly squeezes the confining pressure that core sample 46 forms package rock core, the confining pressure environment of rock core under simulation stratum condition；
In addition, be provided with the first valve between high pressure core holding unit 204 and first pressure gauge 203, confining pressure injection hole with
It is provided with the second valve between second pressure gauge 205, is provided between high pressure core holding unit 204 and high-precision pressure gauge 207
Third valve；First pressure gauge 203, high-precision pressure gauge 204 and second pressure gauge 205 are digital display manometer；High-precision is pressed
The range of power table 204 is 10KPa-30MPa, and the range of first pressure gauge 203 is 10KPa-30MPa；The amount of second pressure gauge 205
Journey is 10KPa-30MPa, and 1 bottom of baking oven is additionally provided with damping device.
High pressure core holding unit 204 can be customized using corrosion-resistant heatproof material, go structure as shown in Fig. 2, the high pressure rock
It includes outer cylinder shell 41 that the heart, which accommodates device 204, and outer cylinder shell 41 is nested inside with rock core seal sleeve 42,41 both ends of outer cylinder shell point
It is not provided with and blocks plug 43, and be respectively arranged with the filter of 10-20 mesh between 42 both ends of rock core seal sleeve and closure plug 43
Piece 44,42 inner wall of rock core seal sleeve are provided with circle rubber sheet gasket 45 in homogeneous thickness, as shown in figure 3, rubber sheet gasket 45 will
Core sample 46 in rock core seal sleeve 42 tightly wraps up, and forms ring between outer cylinder shell 41 and rock core seal sleeve 42 and presses chamber
47；The high pressure core holding unit 204 can bear the confining pressure of 10 DEG C -40 DEG C He 0-20MPa.It is opened up on the side wall of outer cylinder shell 41
Confining pressure injection hole, hand fresh water pump 206 presses 47 injection pressure of chamber to ring by confining pressure injection hole, as shown in figure 3, pressure passes through filter
Piece 44 enters rock core seal sleeve 42, and simulation confining pressure is formed around core sample.
Fig. 4 is the structural schematic diagram of mercury tube 208 used by the present embodiment experimental provision, and the mercury tube of the present embodiment can
To use U-shaped mercury tube, the pressure inlets end of the U-shaped mercury tube is level vial, to 207 pipeline of high-precision pressure gauge
Connection, there is the ground environment of hydraulic pressure in simulation core sample one end, that is, simulates unidirectional imbibition process.Alternatively, the mercury of the present embodiment
Pipe can use L-type mercury tube, as shown in figure 5, the horizontal of the L-type mercury tube can manage into pressure mouth with high-precision pressure gauge 207
Road connection, simulation core sample both ends have the ground environment of hydraulic pressure to simulate two-way imbibition process.In Fig. 4 and Fig. 5 mercury tube
Black portions indicate mercury.
The experimental provision that the present embodiment also provides reservoir rock imbibition under above-mentioned analog formation condition carries out imbibition measurement
Experiment comprising following steps:
(1) core sample is prepared, is packed into be measured in high pressure core holding unit:
Then collection in worksite rock fragment to be measured first is selected sizeable rock fragment and is cleaned, and puts
Enter drying room to be dried, the temperature of drying room 10 is set as 105 DEG C, and drying time is general to dry depending on the size of rock fragment
The quality of rock fragment no longer changes after dry six hours, it can be considered that rock fragment drying；By the rock after drying
Fragment is fitted into be measured in high pressure core holding unit 204；
(2) switch of high-precision pressure gauge 207 is opened, and to the zeros data of high-precision pressure gauge 207, it is ensured that experiment dress
It is normal to set connection；
(3) temperature for adjusting baking oven 1, until display screen 102, which is shown as temperature, stabilizes to required formation temperature, simulated formation
Under the conditions of rock core temperature environment；The core sample in high pressure core holding unit 204 is applied using hand fresh water pump 206
It presses, the confining pressure environment of rock core under simulation stratum condition starts water pump 202, it is filled the water according to the constant water pressure of setting to core sample,
The fluid environment of rock core under simulation stratum condition；
(4) pressure value that record high-precision pressure gauge 207 measures at set time intervals, until the high-precision pressure
Table shows steady pressure；
(5) it repeats the above steps (1)-(4) under different oven temperatures and confining pressure pressure condition, measures and records not equality of temperature
The pressure value that high-precision pressure gauge 207 measures in each time interval under the conditions of degree, confining pressure；
(6) after the imbibition measurement experiment for terminating core sample, second and third valve is closed, 202 is switched off the pump, is hand
Fresh water pump 206 and baking oven 1, by the zeros data of high-precision pressure gauge 204, the data then obtained to measurement experiment are integrated
Analysis and evaluation；
(7) under same temperature and pressure condition, the suction of the core sample under each time interval is calculated according to formula (1)
Water,
The rate of water absorption of the core sample in time interval is calculated according to formula (2),
The water suction total amount of core sample is calculated according to formula (3) or (4),
In formula (1), Δ Q indicate time interval in the core sample water absorption, unit be gram, Δ P indicate the time
The pressure value that the high-precision pressure gauge measures in being spaced, unit Pa, ρ1It indicates under oven temperature and confining pressure pressure condition
The density of water, unit g/cm3, ρ2Indicate the density of the mercury under oven temperature and confining pressure pressure condition, unit g/cm3, d
For the diameter of mercury tube, unit cm, g are acceleration of gravity；
In formula (2), Δ V indicates that the rate of water absorption in time interval, Δ t indicate time interval.
In formula (3), Q indicates the water suction total amount of the core sample, and unit is gram that P indicates the high-precision pressure gauge
The steady pressure of display, unit Pa, ρ1Indicate the density being lauched in oven temperature and confining pressure pressure condition, unit g/cm3,
ρ2Indicate the density of the mercury under oven temperature and confining pressure pressure condition, unit g/cm3, d is the diameter of mercury tube, and unit is
Cm, g are acceleration of gravity；
In formula (4), Δ QiIndicate the water absorption of the core sample in i-th of time interval, unit is gram that k is indicated
Time interval number.
In formula (1) and formula (4), ρ1And ρ2It can be obtained by looking into the density meter of corresponding water and mercury, generally, ρ1
Take 1g/cm3, ρ2Take 13.60g/cm3, g takes 9.8N/m3。
(8) data such as water absorption and rate of water absorption for calculating according to step (7) and arranging different temperatures and pressure condition, and
Analyze water absorption at any time, with temperature and with the situation of change of confining pressure, complete under the core sample formation condition simulation scene
Lab-evaluation.
As can be seen from the above embodiments, under analog formation condition provided by the invention reservoir rock imbibition experimental provision,
Realize core temperature environment under formation condition, in confining pressure environment and gap pressure flow body environment controllable simulation, inhale rock core
The measurement result of water is closer to actual conditions；Water when finely measuring pressure stabilizing using the high-precision pressure gauge that precision reaches 0.1%
The pressure value of silver-colored pipe avoids and directly reads liquid level data in the mobile displacement of U-tube mercury or L-type pipe in conventional method
Data error is artificially read caused by and, substantially increases the measurement accuracy of experiment；And U-shaped mercury tube can be with simulation core sample
There is the ground environment of hydraulic pressure in one end, and L-type mercury tube can have the ground environment of hydraulic pressure, i.e., U-shaped mercury with simulation core sample both ends
Pipe can simulate unidirectional imbibition process, and L-type mercury tube can simulate two-way imbibition process.Analog stratum provided by the invention item
The method of reservoir rock imbibition under part realizes stratum using the experimental provision of reservoir rock imbibition under analog formation condition
Under the conditions of core temperature environment, in confining pressure environment and gap pressure flow body environment controllable simulation；Pass through high-precision pressure gauge essence
The pressure of thin measurement mercury tube calculates core sample in certain time period using formula in conjunction with the diameter of mercury tube indirectly
Water absorption, rate of water absorption avoid the artificial error for reading mercury tube fluid level data, substantially increase the measurement accuracy of experiment；
Furthermore, it is possible to which water absorption changes with time relationship analog study core sample under formation conditions, there is the rock of confining pressure from
The heart absorbs water in phenomenon, further analyzes core sample rate of water absorption, capillarity phenomenon and water absorption；In addition, provided by the invention
After experimental provision and method can be used for analog study target zone fracturing work, fracturing fluid enters the spontaneous imbibition generated in reservoir
Phenomenon.
Claims (14)
1. the experimental provision of reservoir rock imbibition under a kind of analog formation condition, it is characterised in that: the experimental provision includes
Baking oven, the oven interior are provided with drying room and measuring chamber；
High pressure core holding unit is provided in the measuring chamber, one end of the high pressure core holding unit is connect with sink pipeline,
Water pump and first pressure gauge are disposed between the sink and high pressure core holding unit；
The other end of the high pressure core holding unit is connect with mercury pipeline, between the high pressure core holding unit and mercury tube
It is provided with the high-precision pressure gauge that precision is 0.1%；
Confining pressure injection hole, the confining pressure injection hole and confining pressure injection pump pipeline are offered on the side wall of the high pressure core holding unit
Connection, is provided with second pressure gauge between the confining pressure injection hole and confining pressure injection pump；
The drying room provides heat to the measuring chamber, the temperature environment of rock core under simulation stratum condition；
The water pump is filled the water with setting pressure core sample into the high pressure core holding unit, rock core under simulation stratum condition
Fluid environment；
Confining pressure injection pump core sample into the high pressure core holding unit applies pressure, rock core under simulation stratum condition
Confining pressure environment.
2. the experimental provision of reservoir rock imbibition under analog formation condition according to claim 1, it is characterised in that: institute
Stating mercury tube includes U-shaped mercury tube or L-type mercury tube.
3. the experimental provision of reservoir rock imbibition under analog formation condition according to claim 1, it is characterised in that: institute
Stating high pressure core holding unit includes outer cylinder shell, and the outer cylinder enclosure interior is nested with rock core seal sleeve, the outer cylinder shell
Both ends are respectively arranged with closure plug, and are respectively arranged with filter between rock core seal sleeve both ends and the closure plug
Piece, the rock core seal sleeve inner wall are provided with circle rubber sheet gasket in homogeneous thickness, and the outer cylinder shell and the rock core are close
Ring is formed between big envelope cylinder presses chamber.
4. the experimental provision of reservoir rock imbibition under analog formation condition according to claim 3, it is characterised in that: institute
The confining pressure of 0-20MPa under the conditions of stating high pressure core holding unit and capable of bearing 10 DEG C -40 DEG C.
5. the experimental provision of reservoir rock imbibition under analog formation condition according to claim 3, it is characterised in that: institute
It states confining pressure injection hole to be provided on the side wall of the outer cylinder shell, the confining pressure injection pump is by the confining pressure injection hole to described
Ring presses chamber to inject confining pressure.
6. the experimental provision of reservoir rock imbibition under analog formation condition according to claim 3, it is characterised in that: institute
Stating confining pressure injection pump is hand pump；The aperture of the filter disc is 10-20 mesh.
7. the experimental provision of reservoir rock imbibition under analog formation condition according to claim 1, it is characterised in that: institute
It states and is provided with the first valve between high pressure core holding unit and the first pressure gauge, the confining pressure injection hole and second pressure
It is provided with the second valve between power table, is provided with third valve between the high pressure core holding unit and the high-precision pressure gauge
Door.
8. the experimental provision of reservoir rock imbibition under analog formation condition according to claim 1, it is characterised in that: institute
It states baking oven bottom and is provided with damping device.
9. the experimental provision of reservoir rock imbibition under analog formation condition according to claim 1, it is characterised in that: institute
Stating first pressure gauge, high-precision pressure gauge and second pressure gauge is digital display manometer.
10. the experimental provision of reservoir rock imbibition under analog formation condition according to claim 9, it is characterised in that:
The range of the high-precision pressure gauge is 10KPa-30MPa, and the range of the first pressure gauge is 10KPa-30MPa；Described
The range of two pressure gauges is 10KPa-30MPa.
11. the test side of the experimental provision of reservoir rock imbibition under any one of the claim 1-10 analog formation condition
Method comprising following steps:
Step 1: preparing core sample, is packed into be measured in high pressure core holding unit；
Step 2: adjusting oven temperature, the temperature environment of rock core under simulation stratum condition；Then using confining pressure injection pump to described
Core sample applies pressure in high pressure core holding unit, the confining pressure environment of rock core under simulation stratum condition；Subsequent start-up water pump with
The water injection pressure of setting core sample into the high pressure core holding unit fills the water, the fluid ring of rock core under simulation stratum condition
Border；
Step 3: the pressure value that high-precision pressure gauge measures is recorded at set time intervals, until the high-precision pressure gauge
Show steady pressure；
Step 4: the water pump, confining pressure injection pump are closed, and the core sample under each time interval is calculated according to formula (1)
Water absorption,
In the formula (1), Δ Q indicate time interval in the core sample water absorption, unit be gram, Δ P indicate the time
The pressure value that the high-precision pressure gauge measures in being spaced, unit Pa, ρ1It indicates under oven temperature and confining pressure pressure condition
The density of water, unit g/cm3, ρ2Indicate the density of the mercury under oven temperature and confining pressure pressure condition, unit g/cm3, d
For the diameter of mercury tube, unit cm, g are acceleration of gravity.
12. the test method of the experimental provision of reservoir rock imbibition under analog formation condition described in claim 11, special
Sign is: the test method further includes the rate of water absorption that the core sample in time interval is calculated according to formula (2),
In the formula (2), Δ V indicates that the rate of water absorption in time interval, Δ t indicate time interval.
13. the test method of the experimental provision of reservoir rock imbibition under analog formation condition described in claim 11, special
Sign is: the test method further includes that the water suction total amount of the core sample is calculated according to formula (3) or (4),
In the formula (3), Q indicates the water suction total amount of the core sample, and unit is gram that P indicates the high-precision pressure gauge
The steady pressure of display, unit Pa, ρ1Indicate the density being lauched in oven temperature and confining pressure pressure condition, unit g/cm3,
ρ2Indicate the density of the mercury under oven temperature and confining pressure pressure condition, unit g/cm3, d is the diameter of mercury tube, and unit is
Cm, g are acceleration of gravity；
In the formula (4), Δ QiIndicate the water absorption of the core sample in i-th of time interval, unit is gram, when k is indicated
Between be spaced number.
14. the test method of the experimental provision of reservoir rock imbibition under analog formation condition described in claim 11, special
Sign is: the test method further includes the testing rock core sample suction under different oven temperatures, confining pressure pressure and water injection pressure
The step of water.
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