CN114961638A - Supermolecule gel-low-temperature high-strength gel casing damage sand consolidation leakage stopping method - Google Patents
Supermolecule gel-low-temperature high-strength gel casing damage sand consolidation leakage stopping method Download PDFInfo
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- 239000004576 sand Substances 0.000 title claims abstract description 37
- 238000000034 method Methods 0.000 title claims abstract description 32
- 238000007596 consolidation process Methods 0.000 title claims abstract description 16
- 239000002002 slurry Substances 0.000 claims abstract description 43
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 34
- 238000004140 cleaning Methods 0.000 claims abstract description 21
- 239000007788 liquid Substances 0.000 claims abstract description 14
- 238000005553 drilling Methods 0.000 claims abstract description 11
- 238000005406 washing Methods 0.000 claims abstract description 10
- 230000000694 effects Effects 0.000 claims abstract description 8
- 238000002955 isolation Methods 0.000 claims abstract description 4
- 238000003756 stirring Methods 0.000 claims description 31
- 238000006073 displacement reaction Methods 0.000 claims description 10
- 230000008569 process Effects 0.000 claims description 9
- 238000002156 mixing Methods 0.000 claims description 8
- 239000000463 material Substances 0.000 claims description 5
- 230000000903 blocking effect Effects 0.000 claims description 4
- 230000008439 repair process Effects 0.000 claims description 4
- 238000007789 sealing Methods 0.000 claims description 4
- 230000004888 barrier function Effects 0.000 claims description 2
- 230000008021 deposition Effects 0.000 claims description 2
- 238000009775 high-speed stirring Methods 0.000 claims description 2
- 238000002360 preparation method Methods 0.000 claims description 2
- 238000010276 construction Methods 0.000 abstract description 6
- 230000009471 action Effects 0.000 abstract description 3
- 239000008398 formation water Substances 0.000 abstract description 2
- 230000000717 retained effect Effects 0.000 abstract 1
- 239000012530 fluid Substances 0.000 description 8
- 230000006872 improvement Effects 0.000 description 8
- 239000003208 petroleum Substances 0.000 description 7
- 238000005516 engineering process Methods 0.000 description 6
- 238000005086 pumping Methods 0.000 description 6
- 229910052500 inorganic mineral Inorganic materials 0.000 description 5
- 239000011707 mineral Substances 0.000 description 5
- 239000012752 auxiliary agent Substances 0.000 description 4
- 239000003795 chemical substances by application Substances 0.000 description 4
- 239000000203 mixture Substances 0.000 description 4
- 238000004519 manufacturing process Methods 0.000 description 3
- 125000006850 spacer group Chemical group 0.000 description 3
- 238000012360 testing method Methods 0.000 description 3
- 230000008719 thickening Effects 0.000 description 3
- 238000011161 development Methods 0.000 description 2
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 description 2
- 239000000126 substance Substances 0.000 description 2
- 239000010426 asphalt Substances 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000015271 coagulation Effects 0.000 description 1
- 238000005345 coagulation Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 239000007789 gas Substances 0.000 description 1
- 150000002430 hydrocarbons Chemical class 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 239000003345 natural gas Substances 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
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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
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09K—MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE
- C09K8/00—Compositions for drilling of boreholes or wells; Compositions for treating boreholes or wells, e.g. for completion or for remedial operations
- C09K8/50—Compositions for plastering borehole walls, i.e. compositions for temporary consolidation of borehole walls
- C09K8/516—Compositions for plastering borehole walls, i.e. compositions for temporary consolidation of borehole walls characterised by their form or by the form of their components, e.g. encapsulated material
-
- 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
- E21B29/00—Cutting or destroying pipes, packers, plugs or wire lines, located in boreholes or wells, e.g. cutting of damaged pipes, of windows; Deforming of pipes in boreholes or wells; Reconditioning of well casings while in the ground
- E21B29/10—Reconditioning of well casings, e.g. straightening
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E10/00—Energy generation through renewable energy sources
- Y02E10/10—Geothermal energy
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- General Life Sciences & Earth Sciences (AREA)
- Mining & Mineral Resources (AREA)
- Chemical & Material Sciences (AREA)
- Physics & Mathematics (AREA)
- Environmental & Geological Engineering (AREA)
- Fluid Mechanics (AREA)
- Geochemistry & Mineralogy (AREA)
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- Organic Chemistry (AREA)
- Consolidation Of Soil By Introduction Of Solidifying Substances Into Soil (AREA)
Abstract
The invention discloses a damage sand consolidation leakage stopping method of a supermolecule gel-low temperature high-strength gel sleeve, which comprises the following steps: firstly, washing sand, drilling down to the bottom of a casing damage point, cleaning a well hole, sequentially injecting a pre-posed liquid, an isolation liquid, a post-posed cleaning liquid and clear water into the well, standing, preparing low-temperature high-strength gel plugging slurry, injecting the low-temperature high-strength gel plugging slurry into the well for sand consolidation and plugging, finally cleaning each construction device, observing the plugging effect after the low-temperature high-strength gel plugging slurry is cured; the supermolecule gel is directly extruded and injected, so that the supermolecule gel reacts with formation water and forms high-concentration and high-strength gel under the action of airflow disturbance, and can be coalesced and retained near casing damage to achieve better retaining and water-proof effects, and provide support for injecting low-temperature and high-strength gel later.
Description
Technical Field
The invention relates to the technical field of oil exploitation, in particular to a damage sand consolidation and leakage stoppage method of a supermolecule gel-low-temperature high-strength gel sleeve.
Background
Petroleum is a fluid mineral buried underground, and initially, people refer to oily liquid minerals generated in nature as petroleum, combustible gas as natural gas and solid combustible oily minerals as asphalt, and with the intensive research on the minerals, the petroleum is generally called petroleum as the result of recognizing that the minerals belong to hydrocarbon compounds in composition and are connected with one another in cause, and petroleum exploitation refers to the action of excavating and extracting petroleum in places where the petroleum is stored.
In the process of oil exploitation, with the increase of the exploitation years of multi-oil-layer oil fields and the influence of geological conditions and engineering factors, casing damage and casing fluid leakage frequently occur, the development of main oil fields in China enters the middle and later stages at present, the number of casing damage wells and the casing damage degree are synchronously increased, casing damage becomes one of important factors influencing the normal operation of the oil industry in China, the number of casing damage wells is increased year by year, a plurality of concentrated casing damage areas are caused, the development well network is incomplete, the great loss of oil field assets is caused, the normal production of the oil field is seriously influenced, the casing damage well repair rate is low, the difficult and complicated well proportion is high, and the repair difficulty is increased.
At present, common casing damage well treatment modes comprise a small casing cementing process, a chemical plugging technology, a casing patching technology and a casing replacing technology, wherein the small casing cementing process sacrifices the inner diameter of a shaft, the chemical plugging technology has low pressure test and cannot meet the plugging operation of an old well, the casing patching technology reduces the inner diameter of a casing, the implementation of a well completion process is limited, the casing replacing technology has long construction period and high cost, and therefore, the traditional casing damage well treatment modes have certain defects, and therefore the supermolecule gel-low-temperature high-strength gel casing damage sand consolidation plugging method is provided for solving the problems in the prior art.
Disclosure of Invention
Aiming at the problems, the invention aims to provide a supermolecule gel-low-temperature high-strength gel casing damage sand consolidation plugging method, which solves the problems that the casing damage well treatment mode in the existing oil exploitation process is low in pressure test, cannot meet the plugging operation of an old well, limits the implementation of a well completion process, and is long in construction period and high in cost.
In order to achieve the purpose of the invention, the invention is realized by the following technical scheme: a damage sand consolidation plugging method of a supermolecule gel-low temperature high strength gel sleeve comprises the following steps:
the method comprises the following steps: firstly, washing sand, drilling down to the bottom of a casing damage point, cleaning a well hole in a large-displacement circular cleaning mode, and then tripping to a wellhead;
step two: firstly, preparing enough white oil, supermolecule low-temperature high-strength gel and clear water in advance according to actual plugging requirements, then using a pump truck connecting pipeline to inject half of the white oil as a front liquid into a well, using the pump truck to inject the supermolecule gel as an isolation liquid into the well, then using the pump truck to inject the other half of the white oil as a rear cleaning liquid into the well, then using the pump truck to inject the clear water into the well, and finally closing the well and standing;
step three: preparing low-temperature high-strength gel plugging slurry in a stirring tank, injecting the prepared low-temperature high-strength gel plugging slurry into a well after standing, and replacing the slurry with clear water after the low-temperature high-strength gel plugging slurry is completely injected;
step four: and after the low-temperature high-strength gel plugging slurry in the well waits for 12 hours, the plug is drilled and drilled in a circulating mode, and the sealing condition is observed so as to obtain the plugging effect of the sleeve damage part.
The further improvement lies in that: in the first step, when sand washing and drilling are carried out, the sand washing and drilling are carried out until the position below the damaged position of the casing, the well is cleaned, no sand deposition is ensured, and the damaged position is kept exposed.
The further improvement lies in that: in the second step, the pump truck is 0.2-0.4 m 3 The displacement of/min is sequentially injected into the pad liquid of 0.2m 3 4m of barrier liquid 3 0.2m of post-cleaning solution 3 And clear water 0.1m 3 The concentration of the white oil and the concentration of the supermolecule gel are both 100 percent.
The further improvement lies in that: in the second step, before injecting materials into the well, a pump truck is adopted to inspect and repair each device and ensure the device to be intact, and the time for closing the well and standing is 12 hours.
The further improvement lies in that: in the third step, the stirring tank is a rectangular tank body, the periphery of the stirring tank is subjected to circular arc treatment, and two high-power stirrers are prepared, wherein the high-power stirrers are electrodeless speed-adjustable stirrers.
The further improvement lies in that: in the third step, the specific preparation steps of the low-temperature high-strength gel plugging slurry are as follows: the supermolecule low-temperature high-strength gel and clear water are uniformly mixed, then poured into a stirring tank at a constant speed for high-speed stirring, and the plugging slurry is prepared after the mixing and stirring are finished.
The further improvement lies in that: the clear water dosage in the process of preparing the low-temperature high-strength gel plugging slurry is 4m 3 The dosage of the supermolecule low-temperature high-strength gel is 2.8t, the concentration is 60-80%, and the density is 1.25-1.35 g/cm 3 The rotating speed of the stirring tank is 3000r/min, and the stirring time is 40-60 min.
The further improvement lies in that: in the third step, the discharge capacity of the low-temperature high-strength gel plugging slurry injected into the well is 0.2m 3 The volume of the clear water replacing slurry is 0.2m 3 。
The invention has the beneficial effects that: the invention directly extrudes and injects supermolecule gel to react with formation water and form high-concentration and high-strength gel under the action of airflow disturbance, and the gel can be coalesced and detained near casing damage to achieve better detention and water isolation effects, and provides support for injecting low-temperature and high-strength gel later.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without creative efforts.
FIG. 1 is a schematic flow diagram of the process of the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Example one
Referring to fig. 1, the embodiment provides a method for plugging a damaged and solidified sand by using a supramolecular gel-low-temperature high-strength gel sleeve, which includes the following steps:
the method comprises the following steps: firstly, washing sand, drilling down to a position below a damaged position of a casing, cleaning a borehole in a large-displacement circulating cleaning mode to ensure that the borehole has no settled sand and a damaged position is exposed, and then tripping to a wellhead;
step two: firstly, white oil of 0.4m is prepared in advance according to the actual plugging requirement 3 Supermolecule low-temperature high-strength gel 4m 3 And clear water 0.1m 3 The main agent and the auxiliary agent of the supermolecule low-temperature high-strength gel are prepared according to the sand spitting condition caused by the leakage of a shaft in proportion, the main agent is self-made, the auxiliary agent is commercially available, the concentrations of the white oil and the supermolecule gel are both 100 percent, and then a pump truck is used for connecting pipelines and the pump truck is used for connecting the pipelines at the speed of 0.2m 3 The discharge volume of/min is 0.2m 3 The white oil is used as pad fluid to be injected into a well, and a pump truck is used for pumping 4m 3 Injecting supermolecule gel as spacer fluid into well, and pumping with pump truck to obtain a gel with a thickness of 0.2m 3 The white oil is used as a post-cleaning solution to be injected into the well, and then 0.1m is pumped by a pump truck 3 The clean water is injected into the well, the well is closed and kept still for 12 hours, and before materials are injected into the well, all equipment is repaired and is ensured to be intact;
step three: firstly, uniformly mixing the low-temperature high-strength gel with clear water, then pouring the mixture into a stirring tank at a constant speed so as toStirring at 3000r/min at high speed, mixing and stirring for 40min to obtain plugging slurry with clear water content of 4m 3 The dosage of the supermolecule low-temperature high-strength gel is 2.8t, the concentration is 60 percent, and the density is 1.25g/cm 3 Then the prepared low-temperature high-strength gel plugging slurry is added by 0.2m 3 Injecting the gel plugging slurry into a well after standing at a displacement of/min, and replacing the slurry with clear water for 0.2m after the low-temperature high-strength gel plugging slurry is completely injected 3 Wherein the stirring tank is a rectangular tank body, the periphery of the stirring tank is subjected to circular arc treatment, and two high-power stirrers are prepared, and the high-power stirrers are stepless speed-adjustable stirrers;
step four: and after the low-temperature high-strength gel plugging slurry in the well waits for 12 hours, the plug is drilled and drilled in a circulating mode, and the sealing condition is observed so as to obtain the plugging effect of the sleeve damage part.
Example two
Referring to fig. 1, the embodiment provides a method for plugging a damaged and solidified sand by using a supramolecular gel-low-temperature high-strength gel sleeve, which includes the following steps:
the method comprises the following steps: firstly, washing sand, drilling down to a position below a damaged position of a casing, cleaning a borehole in a large-displacement circulating cleaning mode to ensure that the borehole has no settled sand and a damaged position is exposed, and then tripping to a wellhead;
step two: firstly, white oil of 0.4m is prepared in advance according to the actual plugging requirement 3 Supermolecule low-temperature high-strength gel 4m 3 And clear water 0.1m 3 Wherein the main agent and the auxiliary agent of the supermolecule low-temperature high-strength gel are prepared according to the proportion of the condition of sand spouting caused by the leakage of a shaft, the concentration of white oil and the concentration of the supermolecule gel are both 100 percent, and then a pump truck is used for connecting pipelines and the pump truck is used for connecting the pipelines at the speed of 0.3m 3 The discharge capacity per min will be 0.2m 3 The white oil is used as pad fluid to be injected into the well, and then a pump truck is used for pumping 4m 3 Injecting supermolecule gel as spacer fluid into well, and pumping with pump truck to obtain a gel with a thickness of 0.2m 3 The white oil is used as a post-cleaning solution to be injected into the well, and then 0.1m is pumped by a pump truck 3 Injecting clear water into the well, closing the well and standing for 12 hours, and overhauling and protecting each device before injecting materials into the wellThe equipment is proved to be intact;
step three: uniformly mixing low-temperature high-strength gel and clear water, uniformly pouring the mixture into a stirring tank, stirring at a high speed of 3000r/min, and mixing and stirring for 50min to obtain plugging slurry, wherein the clear water is used in an amount of 4m 3 The dosage of the supermolecule low-temperature high-strength gel is 2.8t, the concentration is 70%, and the density is 1.30g/cm 3 Then the prepared low-temperature high-strength gel plugging slurry is added by 0.2m 3 Injecting the gel plugging slurry into a well after standing at a displacement of/min, and replacing the slurry with clear water for 0.2m after the low-temperature high-strength gel plugging slurry is completely injected 3 Wherein the stirring tank is a rectangular tank body, the periphery of the stirring tank is subjected to circular arc treatment, and two high-power stirrers are prepared, and the high-power stirrers are stepless speed-adjustable stirrers;
step four: and after the low-temperature high-strength gel plugging slurry in the well waits for 12 hours, the plug is drilled and drilled in a circulating mode, and the sealing condition is observed so as to obtain the plugging effect of the sleeve damage part.
EXAMPLE III
Referring to fig. 1, the embodiment provides a method for plugging a damaged and solidified sand by using a supramolecular gel-low-temperature high-strength gel sleeve, which includes the following steps:
the method comprises the following steps: firstly, washing sand, drilling down to a position below a damaged position of a casing, cleaning a borehole in a large-displacement circulating cleaning mode to ensure that the borehole has no settled sand and a damaged position is exposed, and then tripping to a wellhead;
step two: firstly, white oil of 0.4m is prepared in advance according to the actual plugging requirement 3 Supermolecule low-temperature high-strength gel 4m 3 And clear water 0.1m 3 Wherein the main agent and the auxiliary agent of the supermolecule low-temperature high-strength gel are prepared according to the proportion of the condition of sand spouting caused by the leakage of a shaft, the concentration of white oil and the concentration of the supermolecule gel are both 100 percent, and then a pump truck is used for connecting pipelines and the pump truck is used for connecting the pipelines at the speed of 0.4m 3 The discharge capacity per min will be 0.2m 3 The white oil is used as pad fluid to be injected into the well, and then a pump truck is used for pumping 4m 3 Injecting supermolecule gel as spacer fluid into well, and pumping with pump truck to obtain a gel with a thickness of 0.2m 3 The white oil is injected as a post-cleaning liquidIn the well, then use the pump truck to drive 0.1m 3 The clean water is injected into the well, the well is closed and kept still for 12 hours, and before materials are injected into the well, all equipment is repaired and is ensured to be intact;
step three: uniformly mixing low-temperature high-strength gel and clear water, uniformly pouring the mixture into a stirring tank, stirring at a high speed of 3000r/min, and mixing and stirring for 60min to obtain plugging slurry, wherein the clear water is used in an amount of 4m 3 The dosage of the supermolecule low-temperature high-strength gel is 2.8t, the concentration is 80 percent, and the density is 1.35g/cm 3 Then the prepared low-temperature high-strength gel plugging slurry is added by 0.2m 3 Injecting the gel plugging slurry into a well after standing at a displacement of/min, and replacing the slurry with clear water for 0.2m after the low-temperature high-strength gel plugging slurry is completely injected 3 Wherein the stirring tank is a rectangular tank body, the periphery of the stirring tank is subjected to circular arc treatment, and two high-power stirrers are prepared, and the high-power stirrers are stepless speed-adjustable stirrers;
step four: and (3) cleaning residual low-temperature high-strength gel plugging slurry in the pipeline, the pump truck and the stirring tank by adopting clean water after replacing slurry, and after the low-temperature high-strength gel plugging slurry in the well waits for 12 hours for coagulation, drilling and circularly probing and plugging, and observing the blocking condition to obtain the plugging effect of the sleeve damage part.
Before the construction, the construction method comprises the following steps of,
1 #: adding 210g of low-temperature high-strength gel into 300ml of production water, observing thickening time under the stirring (rotating speed: 80 revolutions per minute), pouring the thickened gel into a plastic cup, and observing curing time and strength;
2 #: then, 240g of the low-temperature high-strength gel was added to 300ml of the production water, and the thickening time was observed under stirring (rotation speed: 80 rpm), and after thickening, the gel was poured into a plastic cup to observe the curing time and strength, and the results are shown in Table 1 below.
TABLE 1
The flow pattern and the strength of the low-temperature high-strength gel are obtained through the test before construction, so that the flow pattern and the strength are qualified.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and should not be taken as limiting the scope of the present invention, which is intended to cover any modifications, equivalents, improvements, etc. within the spirit and scope of the present invention.
Claims (8)
1. A damage sand consolidation plugging method of a supermolecule gel-low temperature high strength gel sleeve is characterized by comprising the following steps:
the method comprises the following steps: firstly, washing sand, drilling down to the bottom of a casing damage point, cleaning a well hole in a large-displacement circular cleaning mode, and then tripping to a wellhead;
step two: firstly, preparing enough white oil, supermolecule low-temperature high-strength gel and clear water in advance according to actual plugging requirements, then using a pump truck connecting pipeline to inject half of the white oil as a front liquid into a well, using the pump truck to inject the supermolecule gel as an isolation liquid into the well, then using the pump truck to inject the other half of the white oil as a rear cleaning liquid into the well, then using the pump truck to inject the clear water into the well, and finally closing the well and standing;
step three: preparing low-temperature high-strength gel plugging slurry in a stirring tank, injecting the prepared low-temperature high-strength gel plugging slurry into a well after standing, and replacing the slurry with clear water after the low-temperature high-strength gel plugging slurry is completely injected;
step four: and after the low-temperature high-strength gel plugging slurry in the well waits for 12 hours, the plug is drilled and drilled in a circulating mode, and the sealing condition is observed so as to obtain the plugging effect of the sleeve damage part.
2. The supramolecular gel-low-temperature high-strength gel casing damage sand consolidation leakage stopping method as claimed in claim 1, characterized in that: in the first step, when sand washing and drilling are carried out, the sand washing and drilling are carried out until the position below the damaged position of the casing, the well is cleaned, no sand deposition is ensured, and the damaged position is kept exposed.
3. According toThe damage sand consolidation plugging method of the supramolecular gel-low-temperature high-strength gel sleeve as claimed in claim 1, characterized in that: in the second step, the pump truck is 0.2-0.4 m 3 The displacement of/min is sequentially injected into the pad liquid of 0.2m 3 4m of barrier liquid 3 0.2m of post-cleaning solution 3 And clear water 0.1m 3 The concentration of the white oil and the concentration of the supermolecule gel are both 100 percent.
4. The supramolecular gel-low-temperature high-strength gel casing damage sand consolidation leakage blocking method according to claim 1, characterized in that: in the second step, before injecting materials into the well, a pump truck is adopted to inspect and repair each device and ensure the device to be intact, and the time for closing the well and standing is 12 hours.
5. The supramolecular gel-low-temperature high-strength gel casing damage sand consolidation leakage blocking method according to claim 1, characterized in that: in the third step, the stirring tank is a rectangular tank body, the periphery of the stirring tank is subjected to circular arc treatment, and two high-power stirrers are prepared, wherein the high-power stirrers are electrodeless speed-adjustable stirrers.
6. The supramolecular gel-low-temperature high-strength gel casing damage sand consolidation leakage blocking method according to claim 1, characterized in that: in the third step, the specific preparation steps of the low-temperature high-strength gel plugging slurry are as follows: the supermolecule low-temperature high-strength gel and clear water are uniformly mixed, then poured into a stirring tank at a constant speed for high-speed stirring, and the plugging slurry is prepared after the mixing and stirring are finished.
7. The supramolecular gel-low-temperature high-strength gel casing damage sand consolidation leakage stopping method as claimed in claim 6, characterized in that: the clear water dosage in the process of preparing the low-temperature high-strength gel plugging slurry is 4m 3 The dosage of the supermolecule low-temperature high-strength gel is 2.8t, the concentration is 60-80%, and the density is 1.25-1.35 g/cm 3 The rotating speed of the stirring tank is 3000r/min, and the stirring time is 40-60 min.
8. The supramolecular gel-low-temperature high-strength gel casing damage sand consolidation leakage stopping method as claimed in claim 1, characterized in that: in the third step, the discharge capacity of the low-temperature high-strength gel plugging slurry injected into the well is 0.2m 3 The volume of the clear water replacing slurry is 0.2m 3 。
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| CN202210792190.XA CN114961638B (en) | 2022-07-07 | 2022-07-07 | Supermolecule gel-low-temperature high-strength gel casing damage sand-fixing plugging method |
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