CN112094389A - High-temperature-resistant liquid bridge plug, preparation method and construction method - Google Patents
High-temperature-resistant liquid bridge plug, preparation method and construction method Download PDFInfo
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- CN112094389A CN112094389A CN202011026253.8A CN202011026253A CN112094389A CN 112094389 A CN112094389 A CN 112094389A CN 202011026253 A CN202011026253 A CN 202011026253A CN 112094389 A CN112094389 A CN 112094389A
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- 239000007788 liquid Substances 0.000 title claims abstract description 83
- 238000010276 construction Methods 0.000 title claims abstract description 32
- 238000002360 preparation method Methods 0.000 title claims abstract description 13
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 33
- 239000003431 cross linking reagent Substances 0.000 claims abstract description 23
- 239000003999 initiator Substances 0.000 claims abstract description 19
- 239000000178 monomer Substances 0.000 claims abstract description 17
- 238000003756 stirring Methods 0.000 claims abstract description 13
- 125000000129 anionic group Chemical group 0.000 claims abstract description 9
- 230000000903 blocking effect Effects 0.000 claims abstract description 7
- 239000012295 chemical reaction liquid Substances 0.000 claims abstract description 6
- 239000000203 mixture Substances 0.000 claims abstract description 5
- 238000010438 heat treatment Methods 0.000 claims abstract description 4
- 239000000243 solution Substances 0.000 claims description 20
- 238000000034 method Methods 0.000 claims description 13
- 239000012530 fluid Substances 0.000 claims description 9
- HRPVXLWXLXDGHG-UHFFFAOYSA-N Acrylamide Chemical compound NC(=O)C=C HRPVXLWXLXDGHG-UHFFFAOYSA-N 0.000 claims description 8
- ROOXNKNUYICQNP-UHFFFAOYSA-N ammonium persulfate Chemical compound [NH4+].[NH4+].[O-]S(=O)(=O)OOS([O-])(=O)=O ROOXNKNUYICQNP-UHFFFAOYSA-N 0.000 claims description 8
- 238000006073 displacement reaction Methods 0.000 claims description 8
- 238000012360 testing method Methods 0.000 claims description 8
- 238000006243 chemical reaction Methods 0.000 claims description 6
- 229910001870 ammonium persulfate Inorganic materials 0.000 claims description 4
- 238000002347 injection Methods 0.000 claims description 4
- 239000007924 injection Substances 0.000 claims description 4
- 238000004519 manufacturing process Methods 0.000 claims description 3
- 230000008439 repair process Effects 0.000 claims description 3
- 125000006850 spacer group Chemical group 0.000 claims description 3
- PQUXFUBNSYCQAL-UHFFFAOYSA-N 1-(2,3-difluorophenyl)ethanone Chemical compound CC(=O)C1=CC=CC(F)=C1F PQUXFUBNSYCQAL-UHFFFAOYSA-N 0.000 claims description 2
- LCPVQAHEFVXVKT-UHFFFAOYSA-N 2-(2,4-difluorophenoxy)pyridin-3-amine Chemical compound NC1=CC=CN=C1OC1=CC=C(F)C=C1F LCPVQAHEFVXVKT-UHFFFAOYSA-N 0.000 claims description 2
- SMZOUWXMTYCWNB-UHFFFAOYSA-N 2-(2-methoxy-5-methylphenyl)ethanamine Chemical compound COC1=CC=C(C)C=C1CCN SMZOUWXMTYCWNB-UHFFFAOYSA-N 0.000 claims description 2
- NIXOWILDQLNWCW-UHFFFAOYSA-N 2-Propenoic acid Natural products OC(=O)C=C NIXOWILDQLNWCW-UHFFFAOYSA-N 0.000 claims description 2
- PKQIZTGHFBCYEN-UHFFFAOYSA-N 4-(4,6-dimethylpyrimidin-2-yl)sulfanyl-2,3,5,6-tetrafluorobenzenesulfonamide Chemical compound CC1=CC(C)=NC(SC=2C(=C(F)C(=C(F)C=2F)S(N)(=O)=O)F)=N1 PKQIZTGHFBCYEN-UHFFFAOYSA-N 0.000 claims description 2
- CERQOIWHTDAKMF-UHFFFAOYSA-N Methacrylic acid Chemical compound CC(=C)C(O)=O CERQOIWHTDAKMF-UHFFFAOYSA-N 0.000 claims description 2
- BRXCDHOLJPJLLT-UHFFFAOYSA-N butane-2-sulfonic acid Chemical compound CCC(C)S(O)(=O)=O BRXCDHOLJPJLLT-UHFFFAOYSA-N 0.000 claims description 2
- FGRVOLIFQGXPCT-UHFFFAOYSA-L dipotassium;dioxido-oxo-sulfanylidene-$l^{6}-sulfane Chemical compound [K+].[K+].[O-]S([O-])(=O)=S FGRVOLIFQGXPCT-UHFFFAOYSA-L 0.000 claims description 2
- FQPSGWSUVKBHSU-UHFFFAOYSA-N methacrylamide Chemical compound CC(=C)C(N)=O FQPSGWSUVKBHSU-UHFFFAOYSA-N 0.000 claims description 2
- USHAGKDGDHPEEY-UHFFFAOYSA-L potassium persulfate Chemical compound [K+].[K+].[O-]S(=O)(=O)OOS([O-])(=O)=O USHAGKDGDHPEEY-UHFFFAOYSA-L 0.000 claims description 2
- 238000005086 pumping Methods 0.000 claims description 2
- 229940047670 sodium acrylate Drugs 0.000 claims description 2
- CHQMHPLRPQMAMX-UHFFFAOYSA-L sodium persulfate Substances [Na+].[Na+].[O-]S(=O)(=O)OOS([O-])(=O)=O CHQMHPLRPQMAMX-UHFFFAOYSA-L 0.000 claims description 2
- AKHNMLFCWUSKQB-UHFFFAOYSA-L sodium thiosulfate Chemical group [Na+].[Na+].[O-]S([O-])(=O)=S AKHNMLFCWUSKQB-UHFFFAOYSA-L 0.000 claims description 2
- 235000019345 sodium thiosulphate Nutrition 0.000 claims description 2
- 230000008901 benefit Effects 0.000 abstract description 2
- 238000003860 storage Methods 0.000 abstract description 2
- 239000003795 chemical substances by application Substances 0.000 description 11
- 229920001971 elastomer Polymers 0.000 description 10
- 239000007864 aqueous solution Substances 0.000 description 8
- 229920002907 Guar gum Polymers 0.000 description 6
- 229960002154 guar gum Drugs 0.000 description 6
- 235000010417 guar gum Nutrition 0.000 description 6
- 239000000665 guar gum Substances 0.000 description 6
- 239000000084 colloidal system Substances 0.000 description 5
- 238000005516 engineering process Methods 0.000 description 5
- 229920002401 polyacrylamide Polymers 0.000 description 5
- 230000005465 channeling Effects 0.000 description 4
- KMUONIBRACKNSN-UHFFFAOYSA-N potassium dichromate Chemical compound [K+].[K+].[O-][Cr](=O)(=O)O[Cr]([O-])(=O)=O KMUONIBRACKNSN-UHFFFAOYSA-N 0.000 description 4
- 239000000843 powder Substances 0.000 description 4
- 239000007787 solid Substances 0.000 description 4
- 239000000126 substance Substances 0.000 description 4
- 230000015556 catabolic process Effects 0.000 description 3
- 238000006731 degradation reaction Methods 0.000 description 3
- 230000018044 dehydration Effects 0.000 description 3
- 238000006297 dehydration reaction Methods 0.000 description 3
- 238000011049 filling Methods 0.000 description 3
- 238000010528 free radical solution polymerization reaction Methods 0.000 description 3
- 238000006116 polymerization reaction Methods 0.000 description 3
- 239000011435 rock Substances 0.000 description 3
- 239000004576 sand Substances 0.000 description 3
- 239000008399 tap water Substances 0.000 description 3
- 235000020679 tap water Nutrition 0.000 description 3
- 230000008719 thickening Effects 0.000 description 3
- 238000010521 absorption reaction Methods 0.000 description 2
- 230000015572 biosynthetic process Effects 0.000 description 2
- 230000008859 change Effects 0.000 description 2
- 230000006835 compression Effects 0.000 description 2
- 238000007906 compression Methods 0.000 description 2
- 238000004132 cross linking Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 239000000806 elastomer Substances 0.000 description 2
- 238000010008 shearing Methods 0.000 description 2
- 244000275012 Sesbania cannabina Species 0.000 description 1
- 229920001938 Vegetable gum Polymers 0.000 description 1
- 230000032683 aging Effects 0.000 description 1
- 229910021538 borax Inorganic materials 0.000 description 1
- 125000002091 cationic group Chemical group 0.000 description 1
- 238000001914 filtration Methods 0.000 description 1
- 239000003292 glue Substances 0.000 description 1
- 230000036571 hydration Effects 0.000 description 1
- 238000006703 hydration reaction Methods 0.000 description 1
- 238000002955 isolation Methods 0.000 description 1
- 238000002156 mixing Methods 0.000 description 1
- 238000011056 performance test Methods 0.000 description 1
- 238000003825 pressing Methods 0.000 description 1
- 238000011085 pressure filtration Methods 0.000 description 1
- 230000008569 process Effects 0.000 description 1
- 239000002994 raw material Substances 0.000 description 1
- 239000004328 sodium tetraborate Substances 0.000 description 1
- 235000010339 sodium tetraborate Nutrition 0.000 description 1
- XJDNKRIXUMDJCW-UHFFFAOYSA-J titanium tetrachloride Chemical compound Cl[Ti](Cl)(Cl)Cl XJDNKRIXUMDJCW-UHFFFAOYSA-J 0.000 description 1
Classifications
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08F—MACROMOLECULAR COMPOUNDS OBTAINED BY REACTIONS ONLY INVOLVING CARBON-TO-CARBON UNSATURATED BONDS
- C08F291/00—Macromolecular compounds obtained by polymerising monomers on to macromolecular compounds according to more than one of the groups C08F251/00 - C08F289/00
-
- 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
- C09K8/504—Compositions based on water or polar solvents
- C09K8/506—Compositions based on water or polar solvents containing organic compounds
- C09K8/508—Compositions based on water or polar solvents containing organic compounds macromolecular compounds
- C09K8/5083—Compositions based on water or polar solvents containing organic compounds macromolecular compounds obtained by reactions only involving carbon-to-carbon unsaturated bonds
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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
- C09K8/504—Compositions based on water or polar solvents
- C09K8/506—Compositions based on water or polar solvents containing organic compounds
- C09K8/508—Compositions based on water or polar solvents containing organic compounds macromolecular compounds
- C09K8/512—Compositions based on water or polar solvents containing organic compounds macromolecular compounds containing cross-linking agents
-
- 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
- C09K8/60—Compositions for stimulating production by acting on the underground formation
- C09K8/84—Compositions based on water or polar solvents
- C09K8/86—Compositions based on water or polar solvents containing organic compounds
- C09K8/88—Compositions based on water or polar solvents containing organic compounds macromolecular compounds
- C09K8/882—Compositions based on water or polar solvents containing organic compounds macromolecular compounds obtained by reactions only involving carbon-to-carbon unsaturated bonds
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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
- C09K8/60—Compositions for stimulating production by acting on the underground formation
- C09K8/84—Compositions based on water or polar solvents
- C09K8/86—Compositions based on water or polar solvents containing organic compounds
- C09K8/88—Compositions based on water or polar solvents containing organic compounds macromolecular compounds
- C09K8/887—Compositions based on water or polar solvents containing organic compounds macromolecular compounds containing cross-linking agents
-
- 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
-
- 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
- E21B33/134—Bridging plugs
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- Chemical & Material Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Engineering & Computer Science (AREA)
- Organic Chemistry (AREA)
- Materials Engineering (AREA)
- Mining & Mineral Resources (AREA)
- Geology (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Fluid Mechanics (AREA)
- Physics & Mathematics (AREA)
- Environmental & Geological Engineering (AREA)
- Geochemistry & Mineralogy (AREA)
- Polymers & Plastics (AREA)
- Medicinal Chemistry (AREA)
- Health & Medical Sciences (AREA)
- Sealing Material Composition (AREA)
Abstract
The invention discloses a high-temperature-resistant liquid bridge plug, a preparation method and a construction method, wherein the liquid bridge plug is a mixture of 13-16.5% of anionic monomer, 4.5-5.5% of cross-linking agent, 0.06-0.08% of initiator and 78-82% of water in percentage by mass; the preparation method comprises the following steps: dissolving an anionic monomer in water, stirring until the monomer is completely dissolved, placing the obtained reaction liquid in a constant-temperature water bath kettle, heating to 30 ℃, adding a cross-linking agent and an initiator into the reaction liquid, and stirring until the cross-linking agent and the initiator are completely dissolved to obtain a high-temperature-resistant temporary blocking liquid bridge plug; the high-temperature-resistant temporary plugging liquid bridge plug has the characteristics of convenience in preparation, high temperature resistance, strong pressure resistance, high gel breaking speed and capability of being constructed for a long time, is polymerized and crosslinked into gel at the temperature of 60-70 ℃, so that the gel forming time is controllable, the temperature resistance can reach 160 ℃, the storage time at normal temperature is long, effective plugging can be realized in the aspect of plugging of oil and gas wells, particularly, construction operations such as replacing a pipe column and the like in a longer construction period can be fully performed, and the advantage of high thermal stability can be fully exerted.
Description
Technical Field
The invention relates to the technical field of oilfield chemistry, in particular to a high-temperature-resistant liquid bridge plug, a preparation method and a construction method.
Background
The conventional temporary well killing technology has the problems that the well killing is always leaked in the conventional temporary well killing technology, the well head pressure is quickly recovered to the position before the well killing, and the subsequent construction operation cannot be carried out under the specific geological conditions, such as serious stratum leakage, quick gas channeling, complex well conditions, high stratum temperature and high well head pressure. A liquid bridge plug which can be polymerized within 70-90 ℃ is gelled, has good high-temperature stability at 160 ℃, does not have changes such as dehydration, degradation and shrinkage after being placed for 100 days, can effectively plug an oil-gas well under the geological conditions, can be broken by adopting different gel breaking methods after construction is completed, and provides a new chemical temporary plugging method for killing the oil-gas well with serious high temperature and stratum loss.
Published patent CN1182112A discloses a liquid rubber plug plugging agent, which is prepared by preparing guar gum powder from guar gum and borax, preparing guar gum base liquid from the guar gum powder and water, and reacting the guar gum base liquid with potassium dichromate powder to generate the liquid rubber plug plugging agent. The plugging agent can bear certain pressure when in use, has the temperature resistance up to 120 ℃, has adjustable gelling time, can bear the pressure difference of 45MPa under the condition of adding sand, can improve the plugging effect and reduce the damage of well fluid to the stratum. However, the temporary plugging agent has low strength, the strength is usually increased by filling sand during construction, the construction difficulty is increased, and the temporary plugging agent can only resist high temperature of 120 ℃, so that the application range is limited.
Published patent CN1047686A discloses a high-temperature resistant temporary plugging agent for completion of a well, which uses sesbania gum and guar gum powder in vegetable gum as raw materials, adopts titanium tetrachloride and potassium dichromate as cross-linking agents, is applied under the conditions of the well depth of 3750m and the well temperature of 143 ℃, and has good temporary plugging effect. However, the temporary plugging agent has low strength, and the strength is increased by filling sand in construction as in patent CN1182112A, which increases construction difficulty, and the temporary plugging agent can only be applied in a vertical well.
Published patent CN102061152A discloses a high-strength controllable gel-breaking chemical temporary plugging liquid rubber plug, which is formed by solution crosslinking polymerization of amphoteric polyacrylamide, cationic monomer, anionic monomer, crosslinking agent, initiator and water in water according to a certain weight ratio; the liquid rubber plug can resist the temperature of 60 ℃, the gelling time can be adjusted within 2-50 min, the pressure difference of fracturing construction above 15MPa can be borne, the liquid rubber plug can replace a mechanical packer to effectively plug a target layer and then carry out conventional fracturing construction, and the gel breaking hydration can be controlled within the required time. However, the rubber plug can only be used in wells with formation temperature below 60 ℃, namely, the well depth is less than 2000m, which greatly limits the application range.
Disclosure of Invention
The invention aims to provide a high-temperature-resistant temporary plugging liquid bridge plug prepared by the preparation method of the high-temperature-resistant temporary plugging liquid bridge plug, so as to solve the problems that the conventional temporary plugging technology cannot solve the problems that the conventional temporary plugging technology is always leaked when well killing is carried out, the well head pressure is quickly recovered before well killing, subsequent construction operation cannot be carried out and the like under specific geological conditions such as serious stratum leakage, quick gas channeling, complex well conditions, high stratum temperature and high well head pressure.
The invention also aims to provide a preparation method of the high-temperature-resistant temporary plugging liquid bridge plug.
The invention also aims to provide a construction method for temporarily plugging the kill shaft, which is implemented by adopting the high-temperature-resistant temporarily-plugging liquid bridge plug.
Therefore, the technical scheme of the invention is as follows:
a high-temperature-resistant temporary blocking liquid bridge plug is a mixture of 13-16.5% of anionic monomer, 4.5-5.5% of cross-linking agent, 0.06-0.08% of initiator and 78-82% of water in percentage by mass; wherein the anionic monomer is at least one of acrylamide, methacrylamide, sodium acrylate, acrylic acid, methacrylic acid, acrylamide and methyl propane sulfonic acid; the initiator is sodium thiosulfate, potassium thiosulfate, ammonium persulfate, sodium persulfate, potassium persulfate or V50; the cross-linking agent is a CLB type cross-linking agent with the number average molecular weight of 700.
A preparation method of the high-temperature-resistant temporary plugging liquid bridge plug comprises the following steps:
s1, dissolving the anionic monomer in water, and stirring until the monomer is completely dissolved to obtain a reaction solution;
and S2, placing the reaction liquid in a constant-temperature water bath kettle, heating to 30 ℃, adding a cross-linking agent and an initiator into the reaction liquid, and stirring until the cross-linking agent and the initiator are completely dissolved to obtain the high-temperature-resistant temporary blocking liquid bridge plug.
A construction method of the high-temperature-resistant temporary plugging liquid bridge plug prepared by the preparation method of the high-temperature-resistant temporary plugging liquid bridge plug comprises the following steps:
s1: connecting pipelines and testing pressure to ensure that the pipelines are not punctured and leak-proof;
s2: back injecting clear water to reduce the well temperature to 70 ℃;
s3: the clear water is injected to ensure that the oil pressure is reduced to 0 MPa;
s4: injecting a spacer fluid positively;
s5: injecting a high-temperature-resistant liquid bridge plug solution;
s6: positive injection of displacement liquid for displacement construction to make the high temperature resistant liquid bridge plug solution enter the designed position and form a section of liquid seal on the upper pipe column;
s7: injecting clear water well killing fluid and closing the well for at least 24 hours;
s8: workover operation;
s9: after well repair is finished, the coiled tubing is lowered to inject gel breaking liquid for plug removal, and flowback is started after at least 10 hours, so that normal production is realized.
Preferably, in steps S2 to S9, the pump displacement of the liquid is 1m3/min。
Compared with the prior art, the high-temperature-resistant temporary plugging liquid bridge plug has the characteristics of convenience in preparation, high temperature resistance, strong pressure resistance, high gel breaking speed and long-time construction, and polymerization crosslinking gelling is started when the temperature is raised to about 60-70 ℃ during use, so that gelling time is controllable, and good high-temperature-resistant stability is still kept at 160 ℃; the change of dehydration, degradation, shrinkage and the like is avoided even if the product is stored for 100 days at normal temperature; the method can realize effective plugging in the aspect of plugging of oil and gas wells, particularly can realize construction operation such as replacement of pipe columns and the like in a longer construction period, can fully exert the advantage of high thermal stability, can carry out gel breaking by adopting different gel breaking methods after the construction is finished, ensures that the viscosity of gel breaking liquid in the well is less than 3mPa.s and the breakthrough pressure is more than 0.5MPa/m after the gel breaking, and provides a new chemical temporary plugging method for the stratum to kill the oil and gas wells with serious high temperature and stratum loss.
Detailed Description
The present invention will be further described with reference to the following examples, which are not intended to limit the invention in any way.
Example 1
A high-temperature-resistant temporary plugging liquid bridge plug is prepared by the following steps:
s201: adding 430g of tap water into a beaker by adopting an open system aqueous solution polymerization method, then adding 70g of acrylamide, and uniformly stirring until all monomers are dissolved;
s202: and (3) placing the beaker in a constant-temperature water bath kettle, adding 25g of CLB type cross-linking agent with the molecular weight of 700 and 0.4g of initiator ammonium persulfate when the temperature of the reaction solution rises to 30 ℃, and stirring until the CLB type cross-linking agent and the initiator ammonium persulfate are completely dissolved to obtain the high-temperature-resistant temporary plugging liquid bridge plug.
The viscosity of the low-molecular-weight solution of the high-temperature-resistant temporary plugging liquid bridge plug is 1 mPa.s.
Standing the high temperature resistant liquid bridge plug in a constant temperature water bath kettle at 60 ℃, thickening the liquid at 25min, forming gel in 32min and deforming, wherein the gel in 52min is not deformable;
example 2
A high-temperature-resistant temporary plugging liquid bridge plug is prepared by the following steps:
s201: adding 430g of tap water into a beaker by adopting an open system aqueous solution polymerization method, then adding 70g of acrylamide, and uniformly stirring until all monomers are dissolved;
s202: and (3) placing the beaker in a constant-temperature water bath kettle, adding 25g of CLB type cross-linking agent with the molecular weight of 700 and 0.3g of initiator V50 when the temperature of the reaction solution rises to 30 ℃, and stirring until the CLB type cross-linking agent and the initiator V50 are completely dissolved to obtain the high-temperature-resistant temporary blocking liquid bridge plug.
The viscosity of the low-molecular-weight solution of the high-temperature-resistant temporary plugging liquid bridge plug is 1 mPa.s.
Standing the high temperature resistant liquid bridge plug in a constant temperature water bath kettle at 60 ℃, thickening the liquid at 36min, forming gel for 50min to be deformable, and forming gel for 62min to be non-deformable.
Example 3
A high-temperature-resistant temporary plugging liquid bridge plug is prepared by the following steps:
s201: adding 430g of tap water into a beaker by adopting an open system aqueous solution polymerization method, then adding 90g of acrylamide, and uniformly stirring until all monomers are dissolved;
s202: and (3) placing the beaker in a constant-temperature water bath kettle, adding 30g of CLB type cross-linking agent with the molecular weight of 700 and 0.4g of initiator V50 when the temperature of the reaction solution rises to 30 ℃, and stirring until the CLB type cross-linking agent and the initiator V50 are completely dissolved to obtain the high-temperature-resistant temporary blocking liquid bridge plug.
The viscosity of the low-molecular-weight solution of the high-temperature-resistant temporary plugging liquid bridge plug is 1 mPa.s.
Standing the high temperature resistant liquid bridge plug in a constant temperature water bath kettle at 60 ℃, thickening the liquid at 13min, forming gel for deformation in 22min, and not deforming the gel for 30 min.
And (3) performance testing:
the temperature resistance test of the liquid bridge plug comprises the following steps:
and (3) placing the liquid bridge plug elastomer at a high temperature of 160 ℃ to observe the state change of the liquid bridge plug elastomer at different times. After experimental liquid bridging plug is gelled, the high-temperature-resistant rubber has good high-temperature-resistant stability at the temperature of 160 ℃.
Experimental results show that after the high-temperature-resistant temporary plugging liquid bridge plug prepared in the embodiment 1-3 is gelled at 60 ℃, the bridge plug still keeps a colorless and transparent solid colloid state at 160 ℃, and after the bridge plug is placed for 100 days, the bridge plug still keeps the transparent solid colloid state except that the bridge plug is changed into light brown, and the bridge plug has no changes such as dehydration, degradation and shrinkage.
(II) testing compression resistance of liquid bridge plug
The viscosity of the high-temperature resistant temporary plugging agent is increased firstly, and is gradually degraded along with the prolonging of high-temperature aging time, the viscosity is gradually reduced, and the temperature is gradually reduced, so that the plugging time is longer. Shearing the synthesized product into small pieces, putting the small pieces into a high-temperature high-pressure filtration apparatus after the small pieces are fully absorbed and expanded, heating the filtration apparatus to 160 ℃, boosting the temperature to 4.5MPa, keeping the temperature and the pressure constant for 4 hours, taking out the small pieces, and observing the rubber blocks without water loss and breakage.
Experimental results show that after the high-temperature-resistant temporary plugging liquid bridge plug prepared in the embodiment 1-3 is gelled at 60 ℃, the difference value of the diameters of the solid colloids before and after the high-temperature treatment at 160 ℃ is about 0.1cm, and the difference value of the heights of the solid colloids is about 0.1 cm.
And then, filling the liquid bridge plug solution into a rock core holder, placing the rock core holder in a 90 ℃ oven for 30min, and then taking out the rock core holder for carrying out a pressure-bearing test. And (5) pressing from one end of the core holder, and observing the glue outlet condition of the other end of the core holder.
The test results are shown in table 1 below.
Table 1:
the experimental result of the bearing capacity of the liquid bridge plug shows that the colloid length of 10cm can bear 0.2MPa, the bearing capacity can reach 2MPa/m after conversion, the state of the temporary plugging agent after water absorption and expansion is not changed, the compression resistance of the temporary plugging agent is good, and the liquid bridge plug provides a new chemical temporary plugging method for the oil-gas well killing well with high temperature and serious stratum leakage for the stratum.
In conclusion, the liquid bridge plug has good pressure resistance, stable performance under high temperature, temperature resistance of 160 ℃, long effective plugging period, low-molecular solution viscosity of only 1mPa.s, good injection property, good pressure bearing performance after gelling, capability of effectively reducing connectivity between a stratum and a pipe column, and capability of effectively plugging a water layer due to certain water absorption capacity.
(III) gel breaking performance test of liquid bridge plug
Shearing the gelled large liquid bridge plug into small gel blocks of about 1cm, and mixing with gel breaking liquid (8 wt.% of H)2O2The aqueous solution) is mixed according to the volume ratio of 1:3, then the mixture is placed in an oven at 140 ℃, the mixture is taken out after reacting for 2 hours, the gel breaking property is observed, the gel block is completely degraded, and the gel breaking solution is clear aqueous solution without viscosity.
Example 4
The stratum leakage of a certain well of the gas storage of the oil field in North China is serious, and the requirement of the working condition of temporary plugging and pipe column taking operation cannot be met by the conventional plugging well killing; the gas channeling is fast, and the pressure channeling is less than 2 hours; the well condition is complex, the construction difficulty is large, and the well depth is more than 4000 meters; the formation temperature is as high as 156 ℃ and the wellhead pressure is as high as 30 Mpa; the working period is long, more than 4 days. The conventional plugging and killing technology is utilized, 550 square plugging and killing fluid is injected, 4 times of plugging is carried out, 2 months are consumed, and plugging cannot be carried out. The method is adopted to carry out well killing construction in 2019 and 4 months.
The amounts of the components and the pumping procedure in this construction are shown in table 2 below.
Table 2:
the site concrete construction process comprises the following steps:
s1: preparing a liquid; 3600kg of clear water is injected into the liquid preparation tank, and then 600kg of acrylamide is added; stirring uniformly and dissolving all the monomers; then 200kg of CLB type cross-linking agent and 2.8kg of initiator V50 are added and stirred until the CLB type cross-linking agent is completely dissolved;
s2: connecting pipelines, and testing the pressure under the pressure of 25MPa to ensure that the pipelines are not punctured and leak-proof;
s3: back-injecting clear water to reduce the well temperature to about 70 ℃ so as to ensure that the high-temperature-resistant liquid bridge plug solution is polymerized normally and prevent sudden polymerization;
s4: the clear water is injected to ensure that the oil pressure is reduced to 0 MPa;
s5: injecting a spacer fluid positively; the isolation liquid adopts 1 wt.% polyacrylamide aqueous solution, and the molecular weight of polyacrylamide is 1000-1500 ten thousand;
s6: injecting a high-temperature-resistant liquid bridge plug solution;
s7: positive injection of displacement liquid for displacement construction to make the high temperature resistant liquid bridge plug solution enter the designed position and form a section of liquid seal on the upper pipe column; the displacement fluid adopts 1 wt.% of polyacrylamide aqueous solution, and the molecular weight of polyacrylamide is 1000-1500 ten thousand;
s8: injecting clear water well killing fluid;
s9: workover operation;
s10: after well repair is finished, injecting a gel breaking solution into the lower coiled tubing for unblocking, and after 10 hours, starting to flow back for normal production; the gel breaking liquid adopts 8 wt.% of H2O2An aqueous solution of (a).
Before the construction, the oil casing pressure is 27MPa, the oil pressure after the construction is 0MPa, and the casing pressure is 0 MPa; the oil pressure is still 0MPa after 24 hours, the casing pressure is slightly increased to 0.5MPa after 48 hours, the casing pressure is slightly increased to 3.0MPa after 72 hours, and clear water is injected for 10m3The oil casing pressure is changed to 0 MPa; injecting a gel breaking liquid after repairing the well for one week, and starting flowback after 10 hours, wherein the viscosity of the flowback liquid is 5 mPa.s; in conclusion, the invention can block the well with serious stratum leakage and the stratum temperature as high as 156 ℃ and can quickly unblock the well.
Claims (4)
1. The high-temperature-resistant temporary blocking liquid bridge plug is characterized by being a mixture of 13-16.5% of anionic monomer, 4.5-5.5% of cross-linking agent, 0.06-0.08% of initiator and 78-82% of water in percentage by mass; wherein the anionic monomer is at least one of acrylamide, methacrylamide, sodium acrylate, acrylic acid, methacrylic acid, acrylamide and methyl propane sulfonic acid; the initiator is sodium thiosulfate, potassium thiosulfate, ammonium persulfate, sodium persulfate, potassium persulfate or V50; the cross-linking agent is a CLB type cross-linking agent with the number average molecular weight of 700.
2. A method for preparing a high temperature resistant temporary plugging liquid bridge plug as claimed in claim 1, characterized by the steps of:
s1, dissolving the anionic monomer in water, and stirring until the monomer is completely dissolved to obtain a reaction solution;
and S2, placing the reaction liquid in a constant-temperature water bath kettle, heating to 30 ℃, adding a cross-linking agent and an initiator into the reaction liquid, and stirring until the cross-linking agent and the initiator are completely dissolved to obtain the high-temperature-resistant temporary blocking liquid bridge plug.
3. The construction method of the high-temperature-resistant temporary plugging liquid bridge plug prepared by the preparation method of the high-temperature-resistant temporary plugging liquid bridge plug as claimed in claim 2 is characterized by comprising the following steps:
s1: connecting pipelines and testing pressure to ensure that the pipelines are not punctured and leak-proof;
s2: back injecting clear water to reduce the well temperature to 70 ℃;
s3: the clear water is injected to ensure that the oil pressure is reduced to 0 MPa;
s4: injecting a spacer fluid positively;
s5: injecting a high-temperature-resistant liquid bridge plug solution;
s6: positive injection of displacement liquid for displacement construction to make the high temperature resistant liquid bridge plug solution enter the designed position and form a section of liquid seal on the upper pipe column;
s7: injecting clear water well killing fluid and closing the well for at least 24 hours;
s8: workover operation;
s9: after well repair is finished, the coiled tubing is lowered to inject gel breaking liquid for plug removal, and flowback is started after at least 10 hours, so that normal production is realized.
4. The construction method according to claim 3, wherein the pumping volumes of the liquids are all 1m in steps S2-S93/min。
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| CN112983374A (en) * | 2021-02-05 | 2021-06-18 | 中国石油天然气股份有限公司 | Liquid bridge plug under-pressure operation method |
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| CN116606637A (en) * | 2023-07-21 | 2023-08-18 | 东营市汇友石油新技术开发有限责任公司 | Liquid bridge plug and preparation method thereof |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN112983374A (en) * | 2021-02-05 | 2021-06-18 | 中国石油天然气股份有限公司 | Liquid bridge plug under-pressure operation method |
| CN113234196A (en) * | 2021-05-13 | 2021-08-10 | 陕西科技大学 | Self-adaptive controllable liquid rubber plug and preparation method and application thereof |
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