CN206410979U - Core holder for simulating hydraulic fracturing and permeability test - Google Patents
Core holder for simulating hydraulic fracturing and permeability test Download PDFInfo
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- CN206410979U CN206410979U CN201720097303.9U CN201720097303U CN206410979U CN 206410979 U CN206410979 U CN 206410979U CN 201720097303 U CN201720097303 U CN 201720097303U CN 206410979 U CN206410979 U CN 206410979U
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Abstract
The utility model relates to a rock core holder for simulating hydraulic fracturing and permeability test, which comprises an axial compression barrel and a rock sample wrapping component, wherein the axial compression barrel is provided with a left pressure head axial compression component and a right pressure head axial compression component, and a loading channel axially runs through the left pressure head axial compression component and the right pressure head axial compression component; the rock sample wrapping component comprises an outer rubber sleeve and an inner rubber sleeve, and a confining pressure cavity is formed between the outer rubber sleeve and the axial compression cylinder; the inner wall surface of the inner rubber sleeve is provided with a plurality of edges; the left end of the inner rubber sleeve is provided with a left sealing gasket adhered to the left end surface of the rock sample, and the left sealing gasket is provided with a central hole; the right-hand member of interior gum cover is provided with the right side of pasting on the rock specimen right-hand member and seals up the pad, and annular guiding gutter has been seted up to the left end portion of right pressure head axial compression part, and the space between the adjacent both edges of interior gum cover link up with this annular guiding gutter, and this annular guiding gutter passes through water conservancy diversion hole intercommunication with loading passageway. The scheme solves the problem that the similar equipment cannot complete hydraulic fracturing and permeability test in a triaxial stress environment.
Description
Technical field
The utility model is related to core test equipment, specifically a kind of rock for being used to simulate hydraulic fracturing and permeability test
Heart clamp holder.
Background technology
Developed for current oil and gas reservoir, particularly unconventional hypotonic oil and gas reservoir exploitation, hydraulic fracturing technology into
For the technology of main raising recovery ratio.Research seems most important with Optimum Hydraulic pressure break parameters and Related Mechanism,
Particularly in the every hydraulic fracturing technology of research, experiment initial condition and rock form can not be changed, before and after comparing pressure break
Effect is particularly significant to studying, wherein, permeability is exactly to characterize one of important parameter of hydraulic fracturing before and after pressure break.
Currently, laboratory research fracturing effect, mainly goes to characterize from macrostate, lays particular emphasis on splitting in research fracturing process
Slit state, crack are extended.Permeability test in before and after pressure break also rests on released state, it is difficult to reach in same experiment condition
Under do not change basic experimental conditions measurement pressure break before and after permeability.The main cause for being difficult to realize this effect be currently without
One kind can the environment such as simulated ground stress and temperature, while for simulate hydraulic fracturing and permeability test core holding unit.
Existing rock core accommodates device and is primarily present following shortcoming：(1) part rock core blessing device is unable to simulated ground stress environment.(2) partly not
Can be under simulated ground stress environment, the permeability before and after mini-frac can only test rock sample permeability under the conditions of without crustal stress.
(3) part energy simulated ground stress environmental testing rock sample permeability, but do not reach the effect of simulation hydraulic fracturing.
The content of the invention
The purpose of this utility model is a kind of core holding unit for being used to simulate hydraulic fracturing and permeability test of offer,
It can solve the problem that the problem of same category of device can not complete hydraulic fracturing under triaxial stress environment and permeability is tested.
The technical solution of the utility model is as follows：
A kind of core holding unit for being used to simulate hydraulic fracturing and permeability test, including axle pressure cylinder body and it is arranged on institute
The rock sample packaging components in axle pressure cylinder body are stated, the left end of the axle pressure cylinder body is provided with left ram shaft splenium part, axle pressure cylinder body
Right part is provided with right ram shaft splenium part, and loading passage is axially through the left ram shaft splenium part and right ram shaft splenium
Part；The rock sample packaging components include outer gum cover and interior gum cover, the two ends correspondence right ram shaft splenium part of the outer gum cover,
Offered on left ram shaft splenium part connection and the formation confined pressure chamber between the axle pressure cylinder body, axle pressure cylinder body and the confined pressure chamber connects
Logical confined pressure supply opening.The outside wall surface of the interior gum cover is cylinder and internal face phase when under confined pressure state with the outer gum cover
Laminating, the internal face of interior gum cover is evenly distributed along the periphery the trapezoidal rib in a plurality of section, and these ribs are parallel with interior gum cover and court
The top surface of inside gum cover central shaft is rock sample contact surface.The left side of interior gum cover and left ram shaft splenium part are in sealing contact, interior glue
The left end of set is provided with the left sealing gasket sticked on rock sample left side, and the center of the left sealing gasket offers one and added with described
Carry passage just to centre bore；The right side of interior gum cover and right ram shaft splenium part are in sealing contact, and the right-hand member of interior gum cover is provided with
The right sealing gasket sticked on rock sample right side, the left part of right ram shaft splenium part offers the ring around the right sealing gasket
Shape guiding gutter, interior gum cover it is adjacent it is digonous between space and the annular diversion trench insertion, the annular diversion trench and right ram shaft pressure
The loading passage of part is connected by pod apertures.
Further, the axle pressure cylinder body has left end cover, and the left ram shaft splenium part includes left pressure head, left taper
Set, left packing ring, adapter sleeve and axle pressure piston, the head of the left pressure head is towards the right side, and the axle pressure piston is set in the bar of left pressure head
In portion, axle pressure piston and left pressure head left part run through axle pressure cylinder body left end cover, axle pressure piston left end side wall with
It is tightly connected and is tightly connected between the right end sidewalls and axle pressure cylinder inboard wall of axle pressure piston between left end cover so that axle pressure is lived
Formed to offer in an axle means of press seals chamber, left end cover between the right-hand member of plug and the left end cover and connect the axle means of press seals chamber
Axial compressive force supply opening；Axle is pressed to be offseted between piston and the head of left pressure head by the left packing ring, and left packing ring is set in a left side
In the bar portion of pressure head, the left coning sleeve is located in the axle pressure cylinder body and is set in the left part of left packing ring, left coning sleeve
Right part is interference fitted with the outer gum cover, the external connection of the adapter sleeve on the outer surface of axle pressure cylinder body, adapter sleeve
The internal left side with left coning sleeve offsets.
Further, the left sealing gasket has O-ring seal towards projection on the end face of the left pressure head.
Further, the right ram shaft splenium part includes right pressure head, right packing ring, small pressure cap, big pressure cap and right coning sleeve,
The head of the right pressure head is towards a left side, and the small pressure cap is set in the bar portion of right pressure head, leads between small pressure cap and the head of right pressure head
Cross the right packing ring to offset, right packing ring is set in the bar portion of right pressure head, the right coning sleeve be located at the axle pressure cylinder body in and
The left part of right packing ring is set in, the left part of right coning sleeve is interference fitted with the outer gum cover, and the big pressure cap is set in the right side
The left part of packing ring and it is connected between small pressure cap and axle pressure cylinder body.
Further, the right sealing gasket has O-ring seal towards projection on the end face of the right pressure head.
Further, a height of 2mm of the rib of the interior gum cover, a length of 4mm in bottom of rib, a length of 2mm in top of rib.
This programme designs gas-liquid seal structure in the end of rock sample packaging components, is led by left and right sealing gasket and annular
The design of chute is sealed to axially and radially corner, can prevent gas or liquid from boundary leakage, makes gas or fluid from adding
The left end for carrying passage enters after core holding unit, the central part full of rock sample, radial direction pressure break or infiltration, finally from interior gum cover inwall
Space through annular diversion trench water conservancy diversion, from the right-hand member outflow of loading passage；Also it can avoid producing in boundary during simulation hydraulic fracturing
Raw mechanics weak spot.
This core holding unit can either simulate the hydraulic fracturing under condition of triaxial stress, can not move again or change rock sample
Permeability before and after experimental situation mini-frac, solve same category of device can not be completed under triaxial stress environment hydraulic fracturing and
The problem of permeability test, can preferably evaluate the effect of hydraulic fracturing.
Brief description of the drawings
Fig. 1 is structural representation of the present utility model；
Fig. 2 is the schematic cross-section of rock sample packaging components of the present utility model；
Fig. 3 is interior gum cover expanded schematic diagram of the present utility model；
Fig. 4 is the top view of structure shown in Fig. 3；
The enlarged drawing that Fig. 5 is part A in Fig. 1；
Fig. 6 is sectional views of the B-B " on direction in Fig. 1.
Embodiment
The utility model will be further described with reference to the accompanying drawings and examples.
A kind of core holding unit for being used to simulate hydraulic fracturing and permeability test, a kind of concrete structure as shown in Figure 1,
It includes axle pressure cylinder body 2 and the rock sample packaging components being arranged in the axle pressure cylinder body 2, and the left end of the axle pressure cylinder body 2 is set
Left ram shaft splenium part is equipped with, the right part of axle pressure cylinder body 2 is provided with right ram shaft splenium part, and loading passage is axially through institute
State left ram shaft splenium part and right ram shaft splenium part, left port 13 of the loading passage on left ram shaft splenium part for gas or
The entrance of liquid loading, the outlet that right output port 17 of the loading passage on right ram shaft splenium part loads for gas or liquid.Institute
Stating rock sample packaging components includes outer gum cover 8 and interior gum cover 9, the two ends correspondence right ram shaft splenium part of the outer gum cover 8, a left side
Ram shaft splenium part connects and formed to offer on confined pressure chamber, axle pressure cylinder body 2 between the axle pressure cylinder body 2 to be connected with the confined pressure chamber
Logical confined pressure supply opening 15.
Difference and prior art, as shown in Figures 2 to 4, the outside wall surface of the interior gum cover 9 is for cylinder and in confined pressure shape
Internal face when under state with the outer gum cover 8 fits, and the internal face of interior gum cover 9 has been evenly distributed along the periphery a plurality of section in ladder
The rib of shape, these ribs it is parallel with interior gum cover 9 and towards the interior central shaft of gum cover 9 top surface be rock sample contact surface.Axle pressure is applied with confined pressure
Plus after, the top surface of rib is close to rock sample, supports confined pressure, the space between rib and rib provides flow channel for liquids and gases.Interior glue
The left side of set 9 and left ram shaft splenium part are in sealing contact, and the left end of interior gum cover 9 is provided with the left side sticked on rock sample left side
Sealing gasket 7, the center of the left sealing gasket 7 offer one with the loading passage just to centre bore；The right side of interior gum cover 9
In sealing contact with right ram shaft splenium part, the right-hand member of interior gum cover 9 is provided with the right sealing gasket 16 sticked on rock sample right side, right
The left part of ram shaft splenium part offers the annular diversion trench 18 around the right sealing gasket 16, interior gum cover 9 it is adjacent it is digonous it
Between space and the insertion of annular diversion trench 18, the loading passage of the annular diversion trench 18 and right ram shaft splenium part passes through water conservancy diversion
Hole 19 is connected, as shown in Figure 5, Figure 6.
The loading of triaxial stress is pressurizeed by hydraulic oil, and pressure size provides device regulation by outer liquid force feed.Promote
The forward axle pressure that provides of left and right ram shaft splenium part acts directly on rock sample end face, and confined pressure passes through the confined pressure in the middle part of core holding unit
The hydraulic oil that supply opening 15 injects is provided, and is acted on outer gum cover 8, is transferred to interior gum cover 9 through outer gum cover 8 and realizes.It is supplied to rock
The triaxial stress of sample is all internal force, it is not necessary to which external component is supported.Outer gum cover 8 is made using the slightly larger rubber of rigidity, interior glue
Set 9 is made using hard rubber, and interior gum cover 9 can be changed at any time.By parts such as interior gum cover 9, left sealing gasket 7, right sealing gaskets 16 more
Conventional permeability test component is changed to, the axial dispersion rate of rock sample when can test non-drill centers.
The diameter of rock sample centre drill one about Φ 3-5mm circular hole, core holding unit center provide a diameter of phi 2mm liquid with
Gas-loaded passage.Rock sample axial dispersion rate experimental method is comprised the following steps that：
Step A1, prepares rock sample.By rock sample cutting machine, Φ 50mm, long 100mm sample are produced.
Step B1, changes experimental part.Interior gum cover 9, left part sealing gasket, right part sealing gasket in core holding unit are taken
Go out, be replaced by the sealing gasket of conventional core permeability test.
Step C1, applies axle pressure and confined pressure.By external pressurized device, rock sample retainer shaft to radial through hydraulic pressure
Oil applies pressure, and reaches experiment axle pressure and confined pressure predetermined value.
Step D1, tests permeability method testing rock core axial dispersion rate according to conventional core, axle is laid down after the completion of test
Pressure and confined pressure, take out rock sample.
Radial direction permeability experimental method comprises the following steps that before and after rock sample pressure break：
Step A2, brill Φ 3-5mm circular hole in the middle of the rock sample for having tested axial dispersion rate and through rock sample, is superscribed interior
Gum cover 9, and be put into rock sample clamper.
Step B2, applies axle pressure and confined pressure.By external pressurized device, rock sample retainer shaft to radial through hydraulic pressure
Oil applies pressure, and reaches experiment axle pressure and confined pressure predetermined value.
Step C2, permeability before test rock sample hydraulic fracturing.The gas that two ends connect permeability test device is clamped in rock sample
Fluid line, the parameter such as pressure value, flow in record experimentation the same with normal experiment test permeability method, further according to
Radial Flow Through Porous Media formula calculates rock sample permeability value before pressure break.
Step D2, simulates hydraulic fracturing.Permeability test gas line is removed, hydraulic fracturing high-pressure fluid is directly connected to
Pipeline, starts hydraulic fracturing experiments, completes after hydraulic fracturing experiments, lays down hydraulic pressure, removes hydraulic fracturing high pressure line.
Step E2, permeability after test rock sample hydraulic fracturing.Method is with step C2.
Rock sample is observed after step F2, hydraulic fracturing.Slowly lay down simultaneously after confined pressure and axle pressure, take out real from interior gum cover 9 is interior
Rock sample is tested to observe and describe.
Specifically, the axle pressure cylinder body 2 has left end cover, the left ram shaft splenium part includes left pressure head 1, left taper
Set 5, left packing ring 6, adapter sleeve 4 and axle pressure piston 3, the head of the left pressure head 1 is towards the right side, and the axle pressure piston 3 is set in left pressure
In first 1 bar portion, the left end cover of axle pressure cylinder body 2 is run through in the left part of axle pressure piston 3 and left pressure head 1, axle pressure piston 3
It is tightly connected between left end side wall and left end cover and the company of sealing between the right end sidewalls and the inwall of axle pressure cylinder body 2 of axle pressure piston 3
Connect so that form the company of offering in an axle means of press seals chamber, left end cover between the right-hand member and the left end cover of axle pressure piston 3
Lead to the axial compressive force supply opening 14 of the axle means of press seals chamber；Axle is pressed passes through the left packing ring 6 between piston 3 and the head of left pressure head 1
Offset, left packing ring 6 is set in the bar portion of left pressure head 1, the left coning sleeve 5 is located in the axle pressure cylinder body 2 and is set in a left side
The left part of packing ring 6, the right part of left coning sleeve 5 is interference fitted with the outer gum cover 8, and the external connection of the adapter sleeve 4 exists
On the outer surface of axle pressure cylinder body 2, the inside of adapter sleeve 4 and the left side of left coning sleeve 5 offset.The left sealing gasket 7 is towards described
Projection has O-ring seal to be used to seal on the end face of left pressure head 1.
The right ram shaft splenium part includes right pressure head 10, right packing ring 21, small pressure cap 12, big pressure cap 11 and right coning sleeve
20, the head of the right pressure head 10 is towards a left side, and the small pressure cap 12 is set in the bar portion of right pressure head 10, small pressure cap 12 and right pressure head 10
Head between offseted by the right packing ring 21, right packing ring 21 is set in the bar portion of right pressure head 10, the right coning sleeve 20
In the axle pressure cylinder body 2 and it is set in the left part of right packing ring 21, the left part of right coning sleeve 20 and the outer mistake of gum cover 8
It is full of cooperation, the big pressure cap 11 is set in the left part of right packing ring 21 and is connected between small pressure cap 12 and axle pressure cylinder body 2.Institute institute
State right sealing gasket 16 has O-ring seal to be used to seal towards projection on the end face of the right pressure head 10.
A height of 2mm of the rib of the interior gum cover 9, a length of 4mm in bottom of rib, a length of 2mm in top of rib.Interior gum cover 9 can wrap up examination
Part size is Φ 50mm × 100mm rock sample, can be by adjusting gum cover thickness moderately adjustment, diameter to adapt to different cavity sizes
Effective adjusting range is 45-65mm, and the effective adjusting range of length is 45mm-105mm.
Claims (6)
1. a kind of core holding unit for being used to simulate hydraulic fracturing and permeability test, including axle pressure cylinder body and it is arranged on described
Rock sample packaging components in axle pressure cylinder body, the left end of the axle pressure cylinder body is provided with left ram shaft splenium part, the right side of axle pressure cylinder body
End is provided with right ram shaft splenium part, and loading passage is axially through the left ram shaft splenium part and right ram shaft splenium
Part；The rock sample packaging components include outer gum cover and interior gum cover, the two ends correspondence right ram shaft splenium part of the outer gum cover,
Offered on left ram shaft splenium part connection and the formation confined pressure chamber between the axle pressure cylinder body, axle pressure cylinder body and the confined pressure chamber connects
Logical confined pressure supply opening, it is characterised in that：The outside wall surface of the interior gum cover be cylinder and when under confined pressure state with the outer glue
The internal face of set fits, and the internal face of interior gum cover is evenly distributed along the periphery the trapezoidal rib in a plurality of section, these ribs with it is interior
Gum cover it is parallel and towards interior gum cover central shaft top surface be rock sample contact surface；
The left side of interior gum cover and left ram shaft splenium part are in sealing contact, and the left end of interior gum cover, which is provided with, sticks in rock sample left side
On left sealing gasket, the center of the left sealing gasket offer one with the loading passage just to centre bore；The right side of interior gum cover
End face and right ram shaft splenium part are in sealing contact, and the right-hand member of interior gum cover is provided with the right sealing gasket sticked on rock sample right side,
The left part of right ram shaft splenium part offers the annular diversion trench around the right sealing gasket, interior gum cover it is adjacent it is digonous between
Space and the annular diversion trench insertion, the annular diversion trench are connected with the loading passage of right ram shaft splenium part by pod apertures.
2. a kind of core holding unit for being used to simulate hydraulic fracturing and permeability test according to claim 1, its feature
It is：The axle pressure cylinder body has left end cover, and the left ram shaft splenium part includes left pressure head, left coning sleeve, left packing ring, company
Female connector and axle pressure piston, the head of the left pressure head is towards the right side, and the axle pressure piston is set in the bar portion of left pressure head, axle pressure piston
It is close between the left end side wall and left end cover of axle pressure piston and the left end cover of axle pressure cylinder body is run through in the left part of left pressure head
Envelope connection and axle pressure piston right end sidewalls and axle pressure cylinder inboard wall between be tightly connected so that axle pressure piston right-hand member with it is described
The axial compressive force feed flow for being offered in an axle means of press seals chamber, left end cover and connecting the axle means of press seals chamber is formed between left end cover
Mouthful；Axle is pressed to be offseted between piston and the head of left pressure head by the left packing ring, and left packing ring is set in the bar portion of left pressure head, institute
State the left part that left coning sleeve is located in the axle pressure cylinder body and is set in left packing ring, the right part of left coning sleeve and the outer glue
Set interference fit, the external connection of the adapter sleeve is on the outer surface of axle pressure cylinder body, the inside of adapter sleeve and left coning sleeve
Left side offsets.
3. a kind of core holding unit for being used to simulate hydraulic fracturing and permeability test according to claim 2, its feature
It is：The left sealing gasket has O-ring seal towards projection on the end face of the left pressure head.
4. a kind of core holding unit for being used to simulate hydraulic fracturing and permeability test according to claim 1, its feature
It is：The right ram shaft splenium part includes right pressure head, right packing ring, small pressure cap, big pressure cap and right coning sleeve, the right pressure head
Head is towards a left side, and the small pressure cap is set in the bar portion of right pressure head, passes through the right packing ring between small pressure cap and the head of right pressure head
Offset, right packing ring is set in the bar portion of right pressure head, the right coning sleeve is located in the axle pressure cylinder body and is set in right packing ring
Left part, the left part of right coning sleeve is interference fitted with the outer gum cover, and the big pressure cap is set in the left part of right packing ring
And be connected between small pressure cap and axle pressure cylinder body.
5. a kind of core holding unit for being used to simulate hydraulic fracturing and permeability test according to claim 4, its feature
It is：The right sealing gasket has O-ring seal towards projection on the end face of the right pressure head.
6. a kind of rock core folder for being used to simulate hydraulic fracturing and permeability test according to any one of claim 1 to 5
Holder, it is characterised in that：A height of 2mm of the rib of the interior gum cover, a length of 4mm in bottom of rib, a length of 2mm in top of rib.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201720097303.9U CN206410979U (en) | 2017-01-25 | 2017-01-25 | Core holder for simulating hydraulic fracturing and permeability test |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201720097303.9U CN206410979U (en) | 2017-01-25 | 2017-01-25 | Core holder for simulating hydraulic fracturing and permeability test |
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| Publication Number | Publication Date |
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| CN206410979U true CN206410979U (en) | 2017-08-15 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201720097303.9U Expired - Fee Related CN206410979U (en) | 2017-01-25 | 2017-01-25 | Core holder for simulating hydraulic fracturing and permeability test |
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