CN112696184A - Fracturing construction method for oil and gas well - Google Patents
Fracturing construction method for oil and gas well Download PDFInfo
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- CN112696184A CN112696184A CN202110311202.8A CN202110311202A CN112696184A CN 112696184 A CN112696184 A CN 112696184A CN 202110311202 A CN202110311202 A CN 202110311202A CN 112696184 A CN112696184 A CN 112696184A
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- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B43/00—Methods or apparatus for obtaining oil, gas, water, soluble or meltable materials or a slurry of minerals from wells
- E21B43/25—Methods for stimulating production
- E21B43/26—Methods for stimulating production by forming crevices or fractures
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- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B33/00—Sealing or packing boreholes or wells
- E21B33/10—Sealing or packing boreholes or wells in the borehole
- E21B33/13—Methods or devices for cementing, for plugging holes, crevices or the like
- E21B33/138—Plastering the borehole wall; Injecting into the formation
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- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B43/00—Methods or apparatus for obtaining oil, gas, water, soluble or meltable materials or a slurry of minerals from wells
- E21B43/11—Perforators; Permeators
- E21B43/116—Gun or shaped-charge perforators
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- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B43/00—Methods or apparatus for obtaining oil, gas, water, soluble or meltable materials or a slurry of minerals from wells
- E21B43/16—Enhanced recovery methods for obtaining hydrocarbons
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Abstract
The invention discloses an oil and gas well fracturing construction method, which adopts a biological knot plugging perforation technology to operate. The fracturing construction process uses the biological knot to replace the staged temporary plugging effect of a bridge plug, the technology of plugging the perforation hole by the biological knot can solve the construction of a casing section, can be used in a normal full well section, and can be used for steering during fracturing. The invention adopts the environment-friendly biological knot staged temporary plugging process, reduces the bridge plug construction risk, uniformly fractures the reservoir, can perform staged fracturing on the casing deformation section, and reduces the yield influence on the well caused by casing deformation.
Description
Technical Field
The invention belongs to the field of geological exploration and development, and particularly relates to an oil-gas well fracturing construction method.
Background
Along with the continuous deepening of oil exploration and development, unconventional oil and gas reservoirs with low permeability, low porosity and the like are increased continuously, the development requirements cannot be met by a conventional vertical well, and a horizontal well gradually becomes a necessary means for improving the comprehensive benefits of the oil exploration and development. The horizontal well has the advantages of large oil drainage area, high single well yield, large penetration degree, high reserve utilization degree, capability of effectively avoiding obstacles and harsh environment zones and the like, and the staged fracturing technology of the horizontal well becomes the main technology of unconventional oil and gas development.
Shale gas is a typical unconventional oil and gas reservoir resource, has the characteristics of low porosity, extremely low matrix permeability and the like, and the implementation of staged fracturing modification of horizontal wells becomes a key technology for realizing efficient development of shale gas reservoirs. The clustering perforation and staged fracturing technology becomes a key technology for shale gas horizontal well development, and the technology achieves the purpose of volume fracturing by staged and staged fracturing in the horizontal well, so that the shale gas yield is improved.
The bridge plug clustering perforation combined operation technology is characterized in that on the premise that a shaft and a stratum are effectively communicated, a perforation pipe string and a bridge plug are conveyed to a target layer by a cable conveying mode according to a pumping design program, the setting and multi-cluster perforation combined operation is completed, and the drift diameter of the bridge plug is plugged by throwing balls to perform staged fracturing. The combination of the bridge plug and the clustering perforation is an important process for realizing the segmentation in a shaft and providing effective perforation tunnels for the segmented fracturing, the process has unlimited staged fracturing stages, can realize large-displacement fracturing, has high reservoir transformation strength and strength, is suitable for low-permeability reservoirs, can be matched with industrial fracturing (including zipper type fracturing and synchronous fracturing), and can greatly improve the operation aging. The bridge plug clustering perforation combination technology comprises the use of drillable composite bridge plugs and soluble bridge plugs.
However, after the construction operation of the composite bridge plug, a tool needs to be set down for drilling and removing; the use of a soluble bridge plug also does not completely ensure that the soluble bridge plug is sufficiently soluble, and in most cases, also requires the removal of a tool for drilling and grinding operations. Therefore, whether a composite bridge plug or a soluble bridge plug is used, the construction period is increased. The problems of drill sticking, casing abrasion, difficult operation of a large-depth well and the like exist during drilling and removing operation, and a large amount of labor and financial cost is consumed in the whole construction process. Meanwhile, the well spacing density and the construction process of the shale gas well easily cause casing deformation, and the casing deformation limits the bridge plug construction process. When the casing pipe is deformed, the bridge plug with smaller diameter is usually replaced for construction, but when the casing pipe is seriously deformed, the bridge plug with small diameter can not solve the construction problem. If the temporary plugging ball and the temporary plugging agent are used, the construction is also insufficient, and the temporary plugging ball is easy to fall off after the pressure application is stopped, so that stable sealing cannot be maintained; the temporary plugging agent is easy to accumulate, and has poor temporary plugging effect on the upper eyelet. And the polylactic acid temporary plugging material used at present has the problems of slow gel breaking, incomplete flowback and certain damage to the stratum.
CN1201511015214.7 discloses a method for realizing temporary plugging steering multi-fracture fracturing in a horizontal well section, which comprises the steps of firstly preparing temporary plugging steering working fluid, wherein the temporary plugging steering working fluid comprises a degradable temporary plugging agent, degradable fibers and low-viscosity carrier fluid; performing segmented fracturing, wherein the sequence of pumping is front liquid → sand carrying liquid → temporary plugging steering working liquid; and after all fracturing is finished, the temporary plugging steering working fluid is degraded and drained.
CN201811620397.9 discloses a staged temporary plugging fracturing method for a horizontal well, which is characterized in that a perforation hole of the horizontal well is temporarily plugged, new cracks are formed around the temporarily plugged perforation hole, the process is repeated, staged fracturing effect on a well section of the horizontal well is achieved, and a more effective and rapid mode is provided for development of the horizontal well. Meanwhile, after the temporary plugging agent is degraded, a support can be formed on the fracture port, the fracturing success rate is improved, the temporary plugging agent cannot be remained in a shaft, and the temporary plugging agent has a high degradation rate in fracturing fluid.
To sum up, the drillable composite bridge plug is used, and the coiled tubing is required to be used for drilling and grinding the bridge plug during later production. The drilling and grinding process is limited by the length of the coiled tubing, a certain time is consumed in the drilling and grinding process, and a certain safety risk exists. By using the soluble bridge plug, the soluble bridge plug can not be completely dissolved after fracturing is finished, and oil is still required to be used for drilling and grinding in the later stage. The bridge plug clustering perforation combination technology is limited by the length of the continuous oil pipe, and the number of stages of the segmentation is limited; the risk of later drilling and grinding is large, the operation time efficiency is long, and the cost is high.
In addition, due to geological well spacing of shale oil and gas reservoirs, the distance between wells is short, and large-scale fracturing enables adjacent well casings which are not fractured to be easy to deform; and the tools are lifted down for many times in the field fracturing construction process, so that the integrity of partial shale oil-gas well shafts is also caused to be in a problem, even the casing is deformed, the bridge plug cannot be smoothly lowered in the later fracturing operation, the bridge plug cannot be smoothly drilled and ground by a continuous oil pipe, even partial well sections are forced to give up the fracturing operation, and the single well yield of the shale oil-gas well is influenced.
The residue after dissolution of the later soluble bridge plug can cause damage to the formation and the pipeline. Due to the fact that the composite bridge plug or the soluble bridge plug is not sufficiently dissolved, a coiled tubing is needed to be used for drilling and grinding, drilling and grinding risks are high, operation timeliness is long, and cost is high.
In order to solve the problems, the invention provides an oil-gas well fracturing construction method.
Disclosure of Invention
Aiming at the problems in the bridge plug perforation combined operation technology, the invention provides a fracturing construction method for an oil-gas well, aiming at shortening the construction period and solving the problem that a bridge plug cannot be put in after casing deformation, and the fracturing construction method adopts an environment-friendly biological junction segmented temporary plugging process, reduces the construction risk of the bridge plug, uniformly fractures a reservoir stratum, can perform segmented fracturing on a casing deformation section and reduces the yield influence on the well caused by casing deformation.
The present invention provides the following scheme:
a fracturing construction method for oil and gas wells is characterized in that a first section of the fracturing construction method uses an oil connecting or toe end sliding sleeve to complete perforation, and the construction is carried out in a sleeve deformation section by adopting the following steps:
step (1), completing perforation of a coiled tubing under a casing deformation section of a horizontal well;
step (2), preparing biological knots and strengthening liquid according to the number of perforation holes, and plugging the perforation section of the previous section;
step (3), using a coiled tubing to put a perforating gun, and completing construction;
step (4), repeating the steps (2) and (3) to complete multi-section perforation;
step (5), according to the construction progress of one section of the continuous oil pipe per day, after 3 sections of construction, injecting a strengthening liquid to block the 1/2 th layer;
step (6), repeating the steps to complete the construction of the deformed section of the sleeve;
and (7) injecting a neutralizing agent by using a continuous oil pipe, completely hydrating the strengthening liquid, and dissolving the biological knots.
Preferably, sufficient biological knots are added during the first construction, the situation is displayed through the discharge capacity and pressure, and the construction operation is carried out after the stratum is successfully plugged.
Preferably, when the first section of the sealing of the strengthening liquid is pumped, 3-5 quick dissolving biological knots are thrown in, dissolved for about 3 days, the discharge capacity can be established, and the strengthening liquid is pumped in place; and pumping the reinforcing liquid 3 days after construction, slowing dissolving the biological nodule in the reinforcing liquid, plugging the gap after the biological nodule is dissolved, and keeping the plugging state for 15-20 days.
Preferably, when the strengthening liquid is pumped, the capsule particles and the hydrating agent are added into the strengthening liquid, and after the strengthening liquid enters the stratum, the capsules are broken under the action of the ground stress, so that the strengthening liquid is hydrated, and the stratum is not damaged.
Preferably, the neutralizing agent contains high molecular and vegetable gum components, and does not pollute stratum.
Preferably, the strengthening liquid is formed by mixing two liquids, the two liquids are respectively injected into a shaft, the liquid is injected to a designed position by a pump, the liquid is in a jelly shape after standing for 2 hours, a gap with the diameter smaller than 2mm can be blocked, 70MPa pressure difference can be borne in the gap with the diameter of 2mm, the biological knot can be suspended in a strengthening agent, and the effective blocking performance can be ensured by matching the two liquids.
Preferably, the reinforcing liquid is modified polyacrylamide modified copolymer.
Preferably, the hydration time of the strengthening liquid is 15-20s, the coiled tubing can be directly put in without waiting for the hydration gel breaking of the strengthening liquid, the viscosity after gel breaking is less than 5mpa · s, and the flowback is not influenced.
Preferably, the biological knot is designed in a rope knot mode, degradable polyglycolic acid fiber materials with tensile strength of more than 120MPa are woven into a rope, then the rope knot is made, weaving lines with certain lengths are reserved at two ends of the rope knot, and the diameter of the biological knot is prepared according to the size of the plugging holes. The structure design is beneficial to preventing biological knots from leaving again after entering the perforation holes, and the biological knots are pressed more and more tightly after entering the perforation holes, so that the fracturing fluid and the propping agent are prevented from entering, and the function of temporary blocking and steering is achieved; the rope knot type structure prevents biological knots from being accumulated in the well, and the biological knots cannot be separated from the perforation holes even if the discharge capacity is reduced after the biological knots enter the perforation holes; according to the characteristics of well conditions and the requirements of construction process, the rope knot mode can be adjusted, including the length, the number and the like of the reserved textile lines.
Preferably, the nodules are contained in a dissolvable shell which ensures that the nodules are not prematurely dissolved within the dispenser and prevents entanglement of individual nodules after dispensing. When the biological knots are pumped to the position for plugging the perforation holes, the dissolvable shell can be broken under the impact force to release the biological knots to plug the perforation holes.
Preferably, the biological knot is slowly dissolved in the strengthening liquid, can keep effective plugging for 30 days, and can keep the plugging performance of the front section at the later construction stage. After the construction of the strengthening liquid is finished, a hydrating agent is injected into the strengthening liquid by using the coiled tubing, so that the strengthening liquid is liquefied into a liquid state, and the biological knots are dissolved.
Preferably, the throwing amount of the biological knots is 1-1.1 times of the number of the perforation, and the pumping displacement is 1-4m3And/min, wherein the specific displacement is determined according to well conditions, section positions and pumping equipment, and the pumping volume is 1 time of the volume of the upper casing of the target section position.
Preferably, a biological knot can be used as a steering tool in the construction process to steer and fracture the unpressurized stratum; and (5) finishing construction.
Preferably, the reinforcing agent is an acrylamide modified copolymer.
The environment-friendly biological structure is applied to a volume fracturing system of an oil-gas well, can be used in different conditions, and selects different construction processes according to different working conditions. The device can be used as a sectional tool when the sleeve deformation occurs and the bridge plug cannot be used; the temporary plugging ball can be replaced as a temporary plugging steering tool; the bridge plug can also be used for performing staged fracturing on a normal well instead of a bridge plug.
The construction process for the sleeve deformation section comprises the following steps: and (4) seriously sleeving the sleeve and preventing the bridge plug from being inserted, and adopting the environment-friendly biological knot and strengthening liquid plugging process. And meanwhile, selecting biological knots with different temperature grades according to different well temperatures and construction schedules.
Before construction, the whole construction period is estimated, high-grade series biological knots are selected in the early stage of construction according to the well temperature (for example, the well temperature is 90 ℃, and the high-grade series biological knots are selected in the early stage), and the dissolution grade is gradually reduced in the midway of construction. Namely, the biological knots with slower dissolution are selected for the first fracturing section of each well, and the biological knots with faster dissolution can be gradually selected for the subsequent sections. Therefore, the biological knot can be guaranteed to effectively plug the early-stage fractured hole, and the used organisms can be guaranteed to be completely dissolved in a short time after one well completes fracturing.
In order to improve the biological plugging effect, the construction process prepares strengthening liquid matched with biological knots for use. The strengthening liquid is used as the environment-friendly biological node pressure-bearing auxiliary product, is in a jelly state in the well, and can bear a certain pressure difference under a long distance. The environment-friendly biological knots can keep long-acting plugging performance in the strengthening liquid, and the environment-friendly biological knots which are put into the strengthening liquid at the beginning still keep effective plugging at the later construction stage, so that the overall layered construction effect is guaranteed. The biological nodule is dissolved more slowly in the strengthening liquid, so that the plugging time of the biological nodule can be prolonged; meanwhile, certain fine gaps can appear along with the slow dissolution of the biological knots, and the reinforcing liquid can block the fine gaps, so that the blocking effect of the process is ensured.
And (3) fracturing construction:
and (3) a perforation process: taking a certain well as an example, the well body is divided into 6 clusters of perforation holes, the length of each cluster of perforation holes is 0.5m, the hole density is 16 holes/m, and the total number of holes in a single segment is 48 holes; 3 clusters are shot at the first section, the length of each cluster of the shot sections is 1m, the hole density is 16 holes/m, and the total hole number of a single section is 48 holes; the section 1 adopts a coiled tubing perforation, and the subsequent section adopts a cable pumping bridge plug perforation; and (3) adopting the perforating charge with equal aperture. The average bullet hole size is 9.9 mm.
Front section plugging: the environmental-friendly biological knot is used for sheathing and transforming section construction, and the early construction part needs to be plugged. And (4) plugging by using a strengthening liquid, injecting a strengthening liquid with the volume of 1 square, replacing the strengthening liquid with the top layer of the upper-section perforation, and waiting for 2 hours for crosslinking. And after the waiting is finished, carrying out perforation and subsequent construction operation.
The environment-friendly biological knot temporary blocking steering: designing 16 environment-friendly biological knots to be put into each section of the main body section; the natural cracks and the high risk section of the sleeve are temporarily blocked for two times, 100kg of temporary blocking agent is added for the first time, and 16 environment-friendly biological knots are added for the second time. And according to the design of each section, putting a corresponding number of the environment-friendly biological knots under corresponding working conditions. The amount of the environment-friendly biological knot is 4-5m 3/min.
Plugging the environment-friendly biological knots: after the construction is finished, different environment-friendly biological knot input modes are adopted according to the perforation modes: and (4) carrying out pumping perforation by using a cable, putting 20 environment-friendly biological knots, and taking the rest 12 holes as pumping channels. Perforating the continuous oil pipe, and putting 36 environment-friendly biological knots, wherein the total input number of the environment-friendly biological knots is 1.1 times of the number of perforation holes.
The discharge capacity requirement is as follows: firstly, when the environment-friendly biological knots are put into construction midway for temporary blocking steering operation, the discharge capacity is reduced to be less than or equal to 10m3And/min, after the ball throwing is finished, pumping at least one shaft volume, and then carrying out displacement increasing operation. Controlling the discharge capacity to be less than or equal to 4m when the environment-friendly biological knots are pumped by other operations3And/min, after the ball is thrown, keeping the discharge volume unchanged, judging the in-place situation according to the change of the pump pressure, or pumping into a shaft with the volume of +10m3Then, the next operation is performed.
The invention adopts the technical scheme, and has the beneficial effects that:
1. the fracturing construction method for the oil and gas well reduces the bridge plug construction risk, uniformly fractures the reservoir, can perform staged fracturing on the casing deformation section, cannot cause section loss on the casing deformation section, can perform staged fracturing on the casing deformation section according to design, and reduces the yield influence on the well caused by casing deformation.
2. The invention relates to an oil-gas well fracturing construction method, which adopts a knot type design biological knot, wherein two ends of the knot are respectively provided with a braided wire with a certain length, the structural design is favorable for preventing the biological knot from leaving again after entering a perforation hole, and the biological knot is pressed more and more tightly after entering the perforation hole so as to prevent fracturing fluid and propping agent from entering; the steering temporary blocking function is realized; the rope knot type structure prevents biological knots from being accumulated in the well, and the biological knots cannot be separated from the perforation holes even if the discharge capacity is reduced after the biological knots enter the perforation holes; according to the characteristics of well conditions and the requirements of construction process, the rope knot mode can be adjusted, including the length, the number and the like of the reserved textile lines.
3. The fracturing construction method of the oil and gas well adopts knot type design biological knots and selects a degradable fiber material which has enough tensile strength and compressive strength and can bear high pressure during fracturing construction, and meanwhile, the temperature resistance range can reach 40-180 ℃. The material can be completely degraded under the well condition, the degradation time can be customized according to different material formulas, and the degradation product is CO2And water, is nontoxic and harmless, and cannot cause damage to stratum and casing.
Drawings
FIG. 1 is a schematic diagram of a knotted design biological knot in the oil and gas well pressure construction method of the present invention.
FIG. 2 is a mass dissolution curve of a knot type design biological knot in the presence of a modified acrylamide copolymer in the oil and gas well pressure construction method.
FIG. 3 is a pressure-bearing curve of an ultrahigh pressure wellbore in the presence of a modified acrylamide copolymer by adopting a knot type design biological knot in the oil and gas well pressure construction method.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present application clearer, the technical solutions in the embodiments of the present application will be clearly and completely described below in conjunction with the embodiments of the present application, and it is obvious that the described embodiments are only a part of the embodiments of the present application, and not all the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments of the present application without making any creative effort, shall fall within the protection scope of the present application.
Example 1
A fracturing construction method for oil and gas wells is characterized in that a first section of the fracturing construction method uses an oil connecting or toe end sliding sleeve to complete perforation, and the construction is carried out in a sleeve deformation section by adopting the following steps:
step (1), completing 48 perforations by a coiled tubing under a casing deformation section of the horizontal well,
step (2), preparing 48 biological knots and 1 square strengthening liquid according to the number of the perforation holes, and plugging the perforation section of the previous section;
step (3), using a coiled tubing to put a perforating gun, and completing 48 perforating constructions;
step (4), repeating the steps (2) and (3) to finish 3 sections of perforation;
pumping reinforcing liquid to block the 1/2 th layer, slowing down the dissolution of the biological nodule in the reinforcing liquid, blocking the gap after the biological nodule is dissolved, and keeping the blocking state for 15-20 days;
step (6), repeating the steps to complete the construction of the whole sleeve deformation section;
and (7) injecting a neutralizing agent by using a continuous oil pipe, completely hydrating the strengthening liquid for 15-20s, dissolving the biological nodule, and reducing the viscosity to be less than 5mpa & s after gel breaking.
Example 2
The same method as in example 1 was used, except that the capsule particles and the hydrating agent were added to the pumped enhancement fluid, and after entering the formation, the capsules broke under the action of the ground stress, hydrating the enhancement fluid, and not damaging the formation.
Example 3
Preparation of biological knots in examples 1 and 2 degradable polyglycolic acid material with molecular weight of 80w and tensile strength of 120MPa was selected, polyglycolic acid material was spun and woven into a rope, the polyglycolic acid rope was then used to make a knot with diameter of 17-20mm, the diameter of the knot was adjusted according to the eyelet to be plugged, and the ends of the knot were left with braided threads with length of 20-25 mm.
And (3) carrying out a dissolution test on the biological knots, wherein the test temperature is 90 ℃, and the medium is clear water.
And (3) test results: at 90 deg.C, under clear water, the solution began to dissolve for 4 days, the knotted portion was completely broken for 6 days, and the solution was completely dissolved on day 11. After drying, weighing is carried out, and the integral dissolution rate reaches 98.8%.
Example 4
The bioknot prepared in example 3 was mixed with an acrylamide modified copolymer enhancer, and the plugging device was subjected to a dissolution test at 90 ℃ with a medium of clear water. The result shows that the biological nodule is slowly dissolved in the reinforcer, can keep effective plugging for 20 days, and can keep the plugging performance at the later construction stage.
Example 5
The bearing performance of the biological knot prepared in example 3 in the strengthening liquid is verified.
Summary of the tests: the maximum outer diameter of the plugging device is measured to be 19.42mm, the minimum outer diameter is measured to be 15.36mm, and the hole diameter is measured as follows: 9 mm.
Connecting a test tool, adding 1L of jelly strengthening liquid, standing for 30min, and adding clear water;
heating to 90 ℃, keeping the temperature for 2h, pressurizing to 52.26MPa, stabilizing the pressure for 24h, and relieving the pressure for 51.26MPa for 3 times;
heating to 120 ℃, pressurizing to 50.45MPa, stabilizing the pressure for 8h, and releasing the pressure for 4 times during the period of 51.06 MPa;
heating to 130 ℃, stabilizing the pressure for 9h at the pressure of 51.06MPa and relieving the pressure for 2 times at the pressure of 52.31 MPa;
the temperature is increased to 140 ℃, the pressure is 52.31MPa, the pressure is stabilized for 8h, the pressure is 50.92MP, and the pressure is released for 2 times.
The test result shows that: the biological nodule is successfully stabilized for 24 hours under the condition of pressing at 90 ℃ and 51 +/-1.5 MPa, the pressure is successfully stabilized for 8 hours under the condition of heating at 120 ℃ and 51.5 +/-1.5 MPa, the pressure is successfully stabilized for 9 hours under the condition of heating at 130 ℃ and 51.5 +/-1.5 MPa, and the pressure is successfully stabilized for 9 hours under the condition of heating at 140 ℃ and 51.5 +/-1.5 MPa in the strengthening solution.
The above-mentioned embodiments only express the specific embodiments of the present application, and the description thereof is more specific and detailed, but not construed as limiting the scope of the present application. It should be noted that, for those skilled in the art, without departing from the technical idea of the present application, several changes and modifications can be made, which are all within the protection scope of the present application.
Claims (9)
1. A fracturing construction method for oil and gas wells is characterized by comprising the following steps:
estimating the whole construction period before construction, selecting a proper series of biological knots in the early construction period according to well temperature, gradually reducing the dissolution grade during construction, selecting the biological knots with slower dissolution for the first fracturing section of each well, and gradually selecting the biological knots with faster dissolution speed for the subsequent sections;
the first section completes perforation by using a sliding sleeve at the end of connecting oil or toe;
the construction is carried out at the deformation section of the sleeve by adopting the following steps:
step (1), completing perforation of a coiled tubing under a casing deformation section of a horizontal well;
step (2), preparing biological knots and strengthening liquid according to the number of perforation holes, and plugging the perforation section of the previous section;
step (3), using a coiled tubing to put a perforating gun, and completing construction;
step (4), repeating the steps (2) and (3) to complete multi-section perforation;
step (5), according to the construction progress of one section of the continuous oil pipe per day, after 3 sections of construction, injecting a strengthening liquid to block the 1/2 th layer;
step (6), repeating the steps to complete the construction of the deformed section of the sleeve;
injecting a neutralizer by using a coiled tubing, completely hydrating the strengthening liquid, dissolving the biological nodule, and performing fracturing exploitation;
when the first section of the reinforced liquid sealing is pumped, 3-5 biological knots are thrown in and dissolved in about 3 days, so that the discharge capacity can be established, and the reinforced liquid is pumped in place; and pumping the reinforcing liquid 3 days after construction, slowing dissolving the biological nodule in the reinforcing liquid, plugging the gap after the biological nodule is dissolved, and keeping the plugging state for 15-20 days.
2. The fracturing construction method of oil and gas well as claimed in claim 1, characterized in that sufficient biological knots are put in the first stage of perforation construction, the situation is displayed through the displacement pressure, and the construction operation is carried out after the success of the formation plugging is determined.
3. The fracturing construction method of oil and gas well as claimed in claim 1, wherein during pumping the strengthening liquid, capsule particles are added into the strengthening liquid, and a hydrating agent is added, so that after entering the stratum, the capsule is broken under the action of the ground stress to hydrate the strengthening liquid.
4. The oil and gas well fracturing construction method of claim 1, wherein the hydration time of the strengthening liquid in the step (6) is 15-20s, the coiled tubing can be directly put in without waiting for the hydration and gel breaking of the strengthening liquid, the viscosity after gel breaking is less than 5 mpa-s, and the flowback is not influenced.
5. The fracturing construction method of oil and gas well as claimed in claim 1, wherein said biological knot is made in the form of a knot by spinning degradable polyglycolic acid fiber material having a tensile strength of more than 120MPa into a rope and then making the rope knot, wherein a certain length of braided thread is left at each end of the rope knot, and the diameter of said biological knot is made according to the size of the hole to be plugged.
6. The fracturing construction method of oil and gas well as claimed in claim 1, wherein the amount of the biological nodules is 1-1.1 times of the number of the perforation, and the pumping capacity is 1-4m3And/min, the pumping volume is 1 time of the volume of the upper sleeve of the target section.
7. The fracturing construction method of oil and gas well as claimed in claim 1, characterized in that if the construction needs to be turned, the biological knot can be used as a turning tool to block the stratum.
8. The fracturing construction method of oil and gas well as claimed in claim 1, characterized in that when an emergency occurs during construction, a corresponding strengthening liquid is injected to slow down the dissolution of biological knots.
9. The fracturing construction method of oil and gas well as claimed in claim 1, characterized in that when an emergency occurs during construction, the biological knots are thrown again to re-block the formation.
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| CN114622886A (en) * | 2022-02-10 | 2022-06-14 | 中国石油化工集团有限公司 | Cross fracturing gas testing construction method for well factory |
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