CN109294541B - Fire flooding well self-degradation temporary plugging agent and preparation method and application thereof - Google Patents
Fire flooding well self-degradation temporary plugging agent and preparation method and application thereof Download PDFInfo
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- CN109294541B CN109294541B CN201811113327.4A CN201811113327A CN109294541B CN 109294541 B CN109294541 B CN 109294541B CN 201811113327 A CN201811113327 A CN 201811113327A CN 109294541 B CN109294541 B CN 109294541B
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- temporary plugging
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- 239000003795 chemical substances by application Substances 0.000 claims abstract description 102
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- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 22
- 229920005989 resin Polymers 0.000 claims abstract description 20
- 239000011347 resin Substances 0.000 claims abstract description 20
- 239000000654 additive Substances 0.000 claims abstract description 14
- 230000000996 additive effect Effects 0.000 claims abstract description 14
- 230000000844 anti-bacterial effect Effects 0.000 claims abstract description 12
- 239000003899 bactericide agent Substances 0.000 claims abstract description 12
- 239000003431 cross linking reagent Substances 0.000 claims abstract description 10
- 239000012760 heat stabilizer Substances 0.000 claims abstract description 10
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- 102000004190 Enzymes Human genes 0.000 claims description 17
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- 238000000034 method Methods 0.000 claims description 14
- 229920003171 Poly (ethylene oxide) Polymers 0.000 claims description 12
- DPXJVFZANSGRMM-UHFFFAOYSA-N acetic acid;2,3,4,5,6-pentahydroxyhexanal;sodium Chemical compound [Na].CC(O)=O.OCC(O)C(O)C(O)C(O)C=O DPXJVFZANSGRMM-UHFFFAOYSA-N 0.000 claims description 11
- 239000001768 carboxy methyl cellulose Substances 0.000 claims description 11
- 235000019812 sodium carboxymethyl cellulose Nutrition 0.000 claims description 11
- 229920001027 sodium carboxymethylcellulose Polymers 0.000 claims description 11
- 150000003863 ammonium salts Chemical class 0.000 claims description 10
- 229920002239 polyacrylonitrile Polymers 0.000 claims description 10
- WSFSSNUMVMOOMR-UHFFFAOYSA-N Formaldehyde Chemical compound O=C WSFSSNUMVMOOMR-UHFFFAOYSA-N 0.000 claims description 9
- 235000014113 dietary fatty acids Nutrition 0.000 claims description 8
- RTZKZFJDLAIYFH-UHFFFAOYSA-N ether Substances CCOCC RTZKZFJDLAIYFH-UHFFFAOYSA-N 0.000 claims description 8
- 239000000194 fatty acid Substances 0.000 claims description 8
- 229930195729 fatty acid Natural products 0.000 claims description 8
- 239000000203 mixture Substances 0.000 claims description 8
- 229910021538 borax Inorganic materials 0.000 claims description 6
- VKYKSIONXSXAKP-UHFFFAOYSA-N hexamethylenetetramine Chemical compound C1N(C2)CN3CN1CN2C3 VKYKSIONXSXAKP-UHFFFAOYSA-N 0.000 claims description 6
- 229920013818 hydroxypropyl guar gum Polymers 0.000 claims description 6
- 239000004328 sodium tetraborate Substances 0.000 claims description 6
- 235000010339 sodium tetraborate Nutrition 0.000 claims description 6
- AKHNMLFCWUSKQB-UHFFFAOYSA-L sodium thiosulfate Chemical compound [Na+].[Na+].[O-]S([O-])(=O)=S AKHNMLFCWUSKQB-UHFFFAOYSA-L 0.000 claims description 6
- 235000019345 sodium thiosulphate Nutrition 0.000 claims description 6
- 239000007864 aqueous solution Substances 0.000 claims description 5
- 238000004132 cross linking Methods 0.000 claims description 5
- 238000013268 sustained release Methods 0.000 claims description 5
- 239000012730 sustained-release form Substances 0.000 claims description 5
- 229920000178 Acrylic resin Polymers 0.000 claims description 4
- 239000004925 Acrylic resin Substances 0.000 claims description 4
- 239000004372 Polyvinyl alcohol Substances 0.000 claims description 4
- 229920000180 alkyd Polymers 0.000 claims description 4
- 150000005215 alkyl ethers Chemical class 0.000 claims description 4
- 125000005037 alkyl phenyl group Chemical group 0.000 claims description 4
- 150000004665 fatty acids Chemical class 0.000 claims description 4
- 235000010299 hexamethylene tetramine Nutrition 0.000 claims description 4
- 229920000728 polyester Polymers 0.000 claims description 4
- 229920006306 polyurethane fiber Polymers 0.000 claims description 4
- 229920002451 polyvinyl alcohol Polymers 0.000 claims description 4
- 229920002907 Guar gum Polymers 0.000 claims description 3
- 239000000665 guar gum Substances 0.000 claims description 3
- 229960002154 guar gum Drugs 0.000 claims description 3
- 235000010417 guar gum Nutrition 0.000 claims description 3
- 239000008399 tap water Substances 0.000 claims description 3
- 235000020679 tap water Nutrition 0.000 claims description 3
- DZSVIVLGBJKQAP-UHFFFAOYSA-N 1-(2-methyl-5-propan-2-ylcyclohex-2-en-1-yl)propan-1-one Chemical compound CCC(=O)C1CC(C(C)C)CC=C1C DZSVIVLGBJKQAP-UHFFFAOYSA-N 0.000 claims description 2
- 150000001639 boron compounds Chemical class 0.000 claims description 2
- DDXLVDQZPFLQMZ-UHFFFAOYSA-M dodecyl(trimethyl)azanium;chloride Chemical compound [Cl-].CCCCCCCCCCCC[N+](C)(C)C DDXLVDQZPFLQMZ-UHFFFAOYSA-M 0.000 claims description 2
- 239000002351 wastewater Substances 0.000 claims 1
- 239000003921 oil Substances 0.000 abstract description 21
- 238000004519 manufacturing process Methods 0.000 abstract description 12
- 238000005086 pumping Methods 0.000 abstract description 3
- 230000006978 adaptation Effects 0.000 abstract description 2
- 239000000499 gel Substances 0.000 description 13
- 230000035699 permeability Effects 0.000 description 10
- 230000006378 damage Effects 0.000 description 9
- 230000000593 degrading effect Effects 0.000 description 9
- 238000001514 detection method Methods 0.000 description 9
- 238000004090 dissolution Methods 0.000 description 8
- 239000010865 sewage Substances 0.000 description 8
- 238000012360 testing method Methods 0.000 description 7
- 239000010779 crude oil Substances 0.000 description 6
- 230000008569 process Effects 0.000 description 6
- 230000015572 biosynthetic process Effects 0.000 description 5
- 230000000694 effects Effects 0.000 description 5
- 239000011435 rock Substances 0.000 description 5
- 239000000126 substance Substances 0.000 description 5
- 238000010276 construction Methods 0.000 description 4
- 108010066429 galactomannanase Proteins 0.000 description 4
- 230000002147 killing effect Effects 0.000 description 4
- 239000007788 liquid Substances 0.000 description 4
- 239000000463 material Substances 0.000 description 4
- 239000011259 mixed solution Substances 0.000 description 4
- 230000005465 channeling Effects 0.000 description 3
- 238000006073 displacement reaction Methods 0.000 description 3
- 239000012530 fluid Substances 0.000 description 3
- 238000007689 inspection Methods 0.000 description 3
- 235000015110 jellies Nutrition 0.000 description 3
- 239000008274 jelly Substances 0.000 description 3
- 239000003350 kerosene Substances 0.000 description 3
- 239000011148 porous material Substances 0.000 description 3
- 229920003169 water-soluble polymer Polymers 0.000 description 3
- 229920000536 2-Acrylamido-2-methylpropane sulfonic acid Polymers 0.000 description 2
- XHZPRMZZQOIPDS-UHFFFAOYSA-N 2-Methyl-2-[(1-oxo-2-propenyl)amino]-1-propanesulfonic acid Chemical compound OS(=O)(=O)CC(C)(C)NC(=O)C=C XHZPRMZZQOIPDS-UHFFFAOYSA-N 0.000 description 2
- BTBUEUYNUDRHOZ-UHFFFAOYSA-N Borate Chemical compound [O-]B([O-])[O-] BTBUEUYNUDRHOZ-UHFFFAOYSA-N 0.000 description 2
- ZOXJGFHDIHLPTG-UHFFFAOYSA-N Boron Chemical compound [B] ZOXJGFHDIHLPTG-UHFFFAOYSA-N 0.000 description 2
- ZRALSGWEFCBTJO-UHFFFAOYSA-N Guanidine Chemical compound NC(N)=N ZRALSGWEFCBTJO-UHFFFAOYSA-N 0.000 description 2
- 239000002253 acid Substances 0.000 description 2
- 230000009471 action Effects 0.000 description 2
- 229910052796 boron Inorganic materials 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 238000011156 evaluation Methods 0.000 description 2
- 238000002474 experimental method Methods 0.000 description 2
- 239000008398 formation water Substances 0.000 description 2
- 230000007774 longterm Effects 0.000 description 2
- 239000013110 organic ligand Substances 0.000 description 2
- 239000000843 powder Substances 0.000 description 2
- 239000000047 product Substances 0.000 description 2
- 230000002829 reductive effect Effects 0.000 description 2
- 239000011734 sodium Substances 0.000 description 2
- CHJJGSNFBQVOTG-UHFFFAOYSA-N N-methyl-guanidine Natural products CNC(N)=N CHJJGSNFBQVOTG-UHFFFAOYSA-N 0.000 description 1
- FAPWRFPIFSIZLT-UHFFFAOYSA-M Sodium chloride Chemical compound [Na+].[Cl-] FAPWRFPIFSIZLT-UHFFFAOYSA-M 0.000 description 1
- 208000027418 Wounds and injury Diseases 0.000 description 1
- 239000012752 auxiliary agent Substances 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000000903 blocking effect Effects 0.000 description 1
- 239000012267 brine Substances 0.000 description 1
- VTYYLEPIZMXCLO-UHFFFAOYSA-L calcium carbonate Substances [Ca+2].[O-]C([O-])=O VTYYLEPIZMXCLO-UHFFFAOYSA-L 0.000 description 1
- 229910000019 calcium carbonate Inorganic materials 0.000 description 1
- 238000004364 calculation method Methods 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 238000004891 communication Methods 0.000 description 1
- 238000007796 conventional method Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- SWSQBOPZIKWTGO-UHFFFAOYSA-N dimethylaminoamidine Natural products CN(C)C(N)=N SWSQBOPZIKWTGO-UHFFFAOYSA-N 0.000 description 1
- 239000012738 dissolution medium Substances 0.000 description 1
- 238000009826 distribution Methods 0.000 description 1
- 238000009472 formulation Methods 0.000 description 1
- 238000002347 injection Methods 0.000 description 1
- 239000007924 injection Substances 0.000 description 1
- 208000014674 injury Diseases 0.000 description 1
- 230000000670 limiting effect Effects 0.000 description 1
- WSFSSNUMVMOOMR-NJFSPNSNSA-N methanone Chemical compound O=[14CH2] WSFSSNUMVMOOMR-NJFSPNSNSA-N 0.000 description 1
- 239000003129 oil well Substances 0.000 description 1
- 230000036961 partial effect Effects 0.000 description 1
- 229920000642 polymer Polymers 0.000 description 1
- 239000002861 polymer material Substances 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 230000002441 reversible effect Effects 0.000 description 1
- 229920006395 saturated elastomer Polymers 0.000 description 1
- 238000009738 saturating Methods 0.000 description 1
- 238000004088 simulation Methods 0.000 description 1
- 239000011780 sodium chloride Substances 0.000 description 1
- HPALAKNZSZLMCH-UHFFFAOYSA-M sodium;chloride;hydrate Chemical compound O.[Na+].[Cl-] HPALAKNZSZLMCH-UHFFFAOYSA-M 0.000 description 1
Classifications
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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
- C09K8/514—Compositions based on water or polar solvents containing organic compounds macromolecular compounds of natural origin, e.g. polysaccharides, cellulose
-
- 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
-
- 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
- C09K8/5086—Compositions based on water or polar solvents containing organic compounds macromolecular compounds obtained otherwise than 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
- C09K2208/00—Aspects relating to compositions of drilling or well treatment fluids
- C09K2208/08—Fiber-containing well treatment fluids
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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
- C09K2208/00—Aspects relating to compositions of drilling or well treatment fluids
- C09K2208/18—Bridging agents, i.e. particles for temporarily filling the pores of a formation; Graded salts
-
- 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
- C09K2208/00—Aspects relating to compositions of drilling or well treatment fluids
- C09K2208/24—Bacteria or enzyme containing gel breakers
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- Chemical & Material Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Organic Chemistry (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Colloid Chemistry (AREA)
- Fire-Extinguishing Compositions (AREA)
Abstract
The invention provides a fireflood well self-degradation temporary plugging agent and a preparation method and application thereof, wherein the fireflood well self-degradation temporary plugging agent is prepared from the following raw materials in percentage by weight of 100 percent: 0.3 to 0.8 percent of main agent; 0.01 to 0.05 percent of cross-linking agent; 0.5-2% of oil-soluble resin; fiber particles 0.2-0.6%; 0.02 to 0.1 percent of heat stabilizer; 0.1 to 0.5 percent of bactericide; 0.2 to 0.6 percent of cleanup additive; 1-3% of filtrate reducer; 0.001-0.004% of slow-release gel breaker; and the balance water. The self-degradation temporary plugging agent for the fireflood well has the characteristics of good pumping performance, good temperature resistance, simplicity in preparation, low cost and the like, is adjustable in gel breaking time, strong in plugging capability, wide in adaptation to oil reservoir types, not prone to polluting strata, capable of entering deep portions of the strata and capable of effectively solving the production problems of difficult operation and the like caused by large gas production rate of the fireflood production well.
Description
Technical Field
The invention relates to a fireflood well self-degradation temporary plugging agent and a preparation method and application thereof, belonging to the technical field of oilfield development.
Background
The fire flooding effect is acted when the fire flooding well is repaired, the communication condition of block planes is complex, the gas channeling interference is serious, the pressure of a shaft cannot be exhausted, the construction preparation time is increased by more than 5 days on average compared with that of a common well, and the well repairing efficiency and the production time rate are seriously influenced. The conventional means is to kill the well by using saline water and use a powder temporary plugging agent, but both have certain technical limitations. In particular, the brine well killing is adopted, because the formation pressure coefficient is low, the well killing fluid is seriously leaked, the formation cannot be balanced, and the excessive injected well killing fluid can cause pollution to the formation. Although the well killing effect is good by adopting the powder temporary plugging agent, the phenomenon of pump blockage after well opening exists on a pump well and a pump inspection well in a fireflood area.
Aiming at the series of problems, shielding temporary plugging agents and temporary plugging technologies are developed at home and abroad in recent years, which mainly utilize water-soluble polymer jelly, acid-soluble particles and high polymer materials to shield and temporarily plug a borehole wall perforation section, and then carry out operations such as pump detection or pipe detection columns and the like, thereby avoiding the safety risk and the increase of operation cost caused by operation under pressure, but also have the following problems: firstly, the water-soluble polymer jelly plugging agent often preferentially enters a pore canal without oil, even if a small amount of the water-soluble polymer jelly plugging agent enters an oil-containing pore canal, the plugging is difficult to be automatically removed, so that the formation permeability is reduced, and the blast hole and the near-well stratum zone can not be effectively plugged. Secondly, the acid-soluble temporary plugging agent is mainly CaCO3Acid liquor is needed to be adopted for plugging removal after the operation of similar products is finished, and the acid liquor injection not only can damage the reservoir, but also increases the operation process and the construction operation cost. Thirdly, the high polymer temporary plugging agent has more applications, good temporary plugging effect, difficult plugging removal and great damage to low-porosity and low-permeability oil fields.
Therefore, the provision of a fireflood well self-degradation temporary plugging agent, and a preparation method and application thereof have become technical problems to be solved urgently in the field.
Disclosure of Invention
In order to solve the defects and shortcomings, the invention aims to provide a self-degradation temporary plugging agent for a fireflood well.
The invention also aims to provide a preparation method of the fireflood well self-degradation temporary plugging agent.
The invention also aims to provide the application of the self-degradation temporary plugging agent for the fireflood well in pump detection or detection column operation of the fireflood well.
In order to achieve the above object, in one aspect, the present invention provides a fireflood well self-degradation temporary plugging agent, wherein the raw materials for preparing the fireflood well self-degradation temporary plugging agent comprise, by weight, 100% of the total weight of the fireflood well self-degradation temporary plugging agent:
0.3 to 0.8 percent of main agent;
0.01 to 0.05 percent of cross-linking agent;
0.5-2% of oil-soluble resin;
fiber particles 0.2-0.6%;
0.02 to 0.1 percent of heat stabilizer;
0.1 to 0.5 percent of bactericide;
0.2 to 0.6 percent of cleanup additive;
1-3% of filtrate reducer;
0.001-0.004% of slow-release gel breaker;
and the balance water.
According to a specific embodiment of the invention, in the fireflood well self-degradation temporary plugging agent, the fireflood well self-degradation temporary plugging agent is prepared by a preparation method comprising the following steps:
(1) adding the main agent into water, and fully stirring and dissolving to obtain a solution A;
(2) adding a bactericide, oil-soluble resin, fiber particles, a heat stabilizer, a cleanup additive, a filtrate reducer and a sustained-release gel breaker into the solution A to obtain a solution B;
(3) and stirring the solution B to uniformly mix the components, adding a cross-linking agent, and continuously stirring to prevent local cross-linking, thereby obtaining the self-degradation temporary plugging agent for the fireflood well.
According to a specific embodiment of the invention, in the fireflood well self-degradation temporary plugging agent, the main agent comprises one or a combination of two of industrial super guar gum or hydroxypropyl guar gum.
According to a specific embodiment of the invention, in the fireflood well self-degradation temporary plugging agent, the crosslinking agent comprises one or a combination of two of borax or organic boron compounds.
The organoboron used in the present invention is a conventional material, which can be prepared by commercially available or conventional methods of preparation in the art, and in the present embodiment is prepared using borate (e.g., Na)2B4O7) With organic ligands (e.g. LGD (OH))6) Stable organic complex formed under the action of chemical assistant.
According to the specific embodiment of the invention, in the fireflood well self-degradation temporary plugging agent, the particle size of the oil-soluble resin is 0.1-2 mm.
According to a specific embodiment of the invention, in the fireflood well self-degradation temporary plugging agent, the oil-soluble resin comprises one or more of alkyd resin, acrylic resin and synthetic fatty acid resin.
The temporary plugging principle of the oil-soluble resin is as follows: in the process of leakage from the leakage channel to the stratum, the temporary plugging material forms a shielding temporary plugging layer near the pore channel to prevent liquid from further leaking into the stratum, so that the well repairing operation is smoothly completed, the external fluid in the shaft can be prevented from invading and polluting the oil layer or temporarily plugging the stratum, the influence of gas channeling of the fireflood well on the operation is avoided, the operation is smoothly performed, the production of crude oil is recovered after the operation is completed, the temporary plugging material is dissolved by the crude oil, the temporary plugging layer is unblocked, and the production channel is unblocked.
According to the specific embodiment of the invention, in the fireflood well self-degradation temporary plugging agent, the fiber length of the fiber particles is 3-15mm, the tensile strength of the fiber is 20-800MPa, and the diameter of the fiber is 10-100 μm.
According to a specific embodiment of the invention, in the fireflood well self-degradation temporary plugging agent, the fiber particles comprise one or more of polyvinyl alcohol fibers, modified polyester fibers and polyurethane fibers.
According to a specific embodiment of the invention, in the fireflood well self-degradation temporary plugging agent, the heat stabilizer comprises one or a combination of two of 2-acrylamido-2-methylpropanesulfonic acid and sodium thiosulfate.
According to a specific embodiment of the invention, in the fireflood well self-degradation temporary plugging agent, the bactericide comprises one or a combination of two of formaldehyde and urotropin.
According to a specific embodiment of the invention, in the fireflood well self-degradation temporary plugging agent, the cleanup additive comprises one or a combination of more of polyoxyethylene alkyl phenyl ether, polyoxyethylene alkyl ether, polyoxyethylene fatty acid ether ester and dodecyl trimethyl ammonium chloride.
According to the specific embodiment of the invention, in the fireflood well self-degradation temporary plugging agent, the fluid loss additive is a mixture obtained by mixing low-viscosity sodium carboxymethylcellulose and hydrolyzed polyacrylonitrile ammonium salt according to the mass ratio of 1:2-2: 1;
preferably, the fluid loss additive is a mixture obtained by mixing low-viscosity sodium carboxymethyl cellulose and hydrolyzed polyacrylonitrile ammonium salt according to a mass ratio of 1: 1.
The low-viscosity sodium carboxymethyl cellulose and the hydrolyzed polyacrylonitrile ammonium salt used in the application are conventional substances and can be obtained commercially, and the viscosity of the low-viscosity sodium carboxymethyl cellulose is less than 1000 mPa.
According to a specific embodiment of the invention, in the fireflood well self-degradation temporary plugging agent, the slow-release gel breaker is a biological enzyme.
According to a specific embodiment of the invention, in the fireflood well self-degradation temporary plugging agent, the biological enzyme is a biological enzyme of which the main component is galactomannanase.
According to a specific embodiment of the invention, in the fireflood well self-degradation temporary plugging agent, the biological enzyme is the enzyme doctor dr.
Among them, the biological enzymes used in the present application are conventional substances which are commercially available, as in the present embodiment, the enzyme used, Dr. Nzyme200, is a product manufactured by Baiott technologies, Inc., Dalian.
On the other hand, the invention also provides a preparation method of the fireflood well self-degradation temporary plugging agent, which comprises the following steps:
(1) adding the main agent into water, and fully stirring and dissolving to obtain a solution A;
(2) adding a bactericide, oil-soluble resin, fiber particles, a heat stabilizer, a cleanup additive, a filtrate reducer and a sustained-release gel breaker into the solution A to obtain a solution B;
(3) and stirring the solution B to uniformly mix the components, adding a cross-linking agent, and continuously stirring to prevent local cross-linking, thereby obtaining the self-degradation temporary plugging agent for the fireflood well.
According to a specific embodiment of the present invention, the preparation method further comprises an operation of preparing the bactericide into an aqueous solution having a mass concentration (calculated by taking the total weight of the aqueous solution as 100%) of 37 to 40%, and adding the aqueous solution to the solution a.
According to a specific embodiment of the present invention, in the preparation method, in the step (1), the temperature of the water is not higher than 50 ℃.
According to a specific embodiment of the present invention, in the preparation method, in the step (1), the water includes clean water, tap water or oilfield sewage.
According to a specific embodiment of the invention, in the preparation method, the stirring is performed at a speed of 50-200r/min for 10-15 min.
According to the specific embodiment of the invention, in the step (2) of the preparation method, firstly, the bactericide is added into the solution A, and finally, the sustained-release gel breaker is added; the adding sequence of the oil-soluble resin, the fiber particles, the heat stabilizer, the cleanup additive and the fluid loss additive is not required to be specific, and the adding sequence of the substances can be reasonably adjusted by a person skilled in the art according to the field operation requirement as long as the aim of the invention can be realized.
According to the specific embodiment of the invention, in the step (3) of the preparation method, after the cross-linking agent is added, stirring is continuously carried out to prevent local cross-linking, so that incomplete gelling of the temporary plugging agent can be avoided.
In another aspect, the invention also provides application of the fireflood well self-degradation temporary plugging agent in fireflood well temporary plugging. The fireflood well self-degradation temporary plugging agent can effectively avoid the influence of gas channeling of an adjacent well on operations such as pump detection of a fireflood production well and the like in the application process.
Tests prove that the plugging rate of the self-degradation temporary plugging agent for the fireflood well can reach more than 90 percent, the temperature can be up to 150 ℃, and the effective period can reach more than 3 d; the damage rate of the temporary plugging agent to the permeability of the rock core is lower than 11 percent; the viscosity after gelling is 8000-15000 mPa.s, and the plugging strength can reach more than 15 MPa/m. The fire flooding well self-degradation temporary plugging agent has the characteristics of good pumping performance, temperature resistance, long-term effectiveness, simplicity in preparation, low cost and the like, is strong in plugging capability, wide in adaptation to oil deposit types, and not easy to pollute stratum, and can effectively avoid the production problems that a fire flooding production well inspection pump or inspection pipe column has large gas production rate and cannot be taken off and put down the pipe column and the like.
The fireflood well self-degradation temporary plugging agent and the application thereof in the operation of fireflood well pump detection or pipe column and the like have the beneficial effects that: 1. the oil-soluble particles are easy to reversely discharge due to high oil solubility, convenient to construct and small in stratum damage, and are suitable for different stratum temperatures; the oil-soluble particles (oil-soluble resin particles) have wide particle size distribution range, and can effectively plug operation wells with different permeability; 2. the dissolution rate in crude oil is high, the self-dissolution can be realized under the stratum condition, the pollution to the stratum is not caused, and the stratum permeability is quickly recovered; 3. the particles can effectively and temporarily block the blast hole of the oil layer, and can also effectively block the large-hole water outlet channel, thereby reducing the formation water outlet, effectively releasing the oil production capacity of the low-permeability formation and achieving the effects of water reduction and oil increase. Compared with other temporary blocking methods, the method has the advantages of small damage, high efficiency, simple process, strong practicability and the like.
Detailed Description
In order to clearly understand the technical features, objects and advantages of the present invention, the following detailed description of the technical solutions of the present invention will be made with reference to the following specific examples, which should not be construed as limiting the implementable scope of the present invention.
Example 1
The embodiment provides a fireflood well is from degrading temporary plugging agent, use the total weight of fireflood well is 100% of degrading temporary plugging agent, and the raw materials of this fireflood well is from degrading temporary plugging agent include:
0.3 percent of industrial grade super guanidine gum;
0.01 percent of borax;
0.5% of alkyd resin (with the particle size of 0.1 mm);
0.2 percent of polyvinyl alcohol fiber (the fiber length is 3mm, the fiber tensile strength is 20MPa, and the fiber diameter is 10 mu m);
0.02 percent of 2-acrylamide-2-methyl propane sulfonic acid;
0.1 percent of formaldehyde;
polyoxyethylene alkyl phenyl ether 0.2%;
1% of mixed solution obtained by mixing low-viscosity sodium carboxymethylcellulose and hydrolyzed polyacrylonitrile ammonium salt according to the mass ratio of 1: 1;
enzyme doctor dr. nzyme200 (galactomannanase) 0.001%;
and the balance of oil field sewage at 40 ℃.
The fire flooding well self-degradation temporary plugging agent is prepared by the following specific steps:
(1) adding industrial grade super guar gum into oil field sewage at 40 ℃, fully stirring and dissolving for 10-15min, wherein the stirring speed is 100 r/min;
(2) adding formaldehyde, alkyd resin, polyvinyl alcohol fiber, 2-acrylamido-2-methylpropanesulfonic acid, polyoxyethylene alkyl phenyl ether, mixed solution of low-viscosity sodium carboxymethyl cellulose and hydrolyzed polyacrylonitrile ammonium salt in a mass ratio of 1:1, and doctor Dr. Nzyme200 into the solution in sequence;
(3) and continuously stirring for 5min, adding borax, and continuously stirring to obtain the fireflood well self-degradation temporary plugging agent.
The prepared fireflood well self-degradation temporary plugging agent is subjected to a core single tube simulation experiment, the permeability change and the breakthrough strength of the core before and after the core is treated by the fireflood well self-degradation temporary plugging agent are inspected, and the experimental data are shown in table 1. The procedure for the determination was as follows:
firstly, saturating a rock core with water;
injecting a certain amount of fireflood well self-degradation temporary plugging agent at a certain flow, wherein the test flow is a conventional flow with constant-temperature water bath and can be pressurized externally;
putting the core injected into the fireflood well self-degradation temporary plugging agent into a closed container, and placing the core in a constant-temperature water bath at a set temperature for a period of time;
and fourthly, under the conditions that the temperature is set and the external pressure is the same, injecting water at a certain flow rate until the first drop of liquid flows down from the outlet end of the core holder and then the liquid continuously flows out, and reading of a pressure gauge at the inlet end is the breakthrough pressure of the self-degradation temporary plugging agent of the fireflood well.
TABLE 1
Experimental results show that the fireflood well self-degradation temporary plugging agent provided by the embodiment 1 of the invention has very strong stratum plugging capability, the effective plugging rate can reach more than 90%, the breakthrough pressure gradient can reach more than 15MPa/m, and the plugging effect is ideal.
Example 2
The embodiment provides a fireflood well is from degrading temporary plugging agent, use the total weight of fireflood well is 100% of degrading temporary plugging agent, and the raw materials of this fireflood well is from degrading temporary plugging agent include:
0.8% of hydroxypropyl guar gum;
0.05 percent of borax;
2% of acrylic resin (with the particle size of 2 mm);
0.6 percent of modified polyester fiber (the fiber length is 15mm, the fiber tensile strength is 800MPa, and the fiber diameter is 100 mu m);
0.1 percent of sodium thiosulfate;
0.5 percent of urotropin;
polyoxyethylene alkyl ether 0.6%;
3% of mixed solution obtained by mixing the low-viscosity sodium carboxymethylcellulose and the hydrolyzed polyacrylonitrile ammonium salt according to the mass ratio of 1: 1;
enzyme doctor dr. nzyme200 (galactomannanase) 0.004%;
and the balance of oil field sewage at 40 ℃.
The fire flooding well self-degradation temporary plugging agent is prepared by the following specific steps:
(1) adding hydroxypropyl guar gum into oil field sewage at 40 ℃, fully stirring and dissolving for 10-15min, wherein the stirring speed is 100 r/min;
(2) sequentially adding urotropine, acrylic resin, modified polyester fiber, sodium thiosulfate, polyoxyethylene alkyl ether, low-viscosity sodium carboxymethyl cellulose and hydrolyzed polyacrylonitrile ammonium salt into the solution, mixing the materials according to the mass ratio of 1:1, and adding enzyme doctor Dr.Nzyme200;
(3) and continuously stirring for 5min, adding borax, and continuously stirring to obtain the fireflood well self-degradation temporary plugging agent.
The fireflood well self-degradation temporary plugging agent prepared in the embodiment is subjected to a long-term stability experiment, and the experimental data are shown in table 2.
TABLE 2
| Time of settling | 1d | 2d | 3d | 4d | 5d | 6d |
| Gel breaking condition | Without breaking the gel | Without breaking the gel | Without breaking the gel | Partial gel breaking | Basic gel breaking | Complete gel breaking |
As can be seen from Table 2, the fireflood well self-degradation temporary plugging agent prepared in example 2 can maintain no gel breaking for 3d at 90 ℃, which indicates that the fireflood well self-degradation temporary plugging agent has good temperature resistance and can completely meet the field operation requirements.
Example 3
The embodiment provides a fireflood well is from degrading temporary plugging agent, use the total weight of fireflood well is 100% of degrading temporary plugging agent, and the raw materials of this fireflood well is from degrading temporary plugging agent include:
0.6% of hydroxypropyl guar gum;
0.03% of organic boron;
the organoboron used in this example was borate (Na)2B4O7) With organic ligands (LGD (OH)6) A stable organic complex formed under the action of a chemical auxiliary agent;
1% of synthetic fatty acid resin (with the grain diameter of 1 mm);
0.3 percent of polyurethane fiber (the fiber length is 10mm, the fiber tensile strength is 500MPa, and the fiber diameter is 50 mu m);
0.05 percent of sodium thiosulfate;
0.25 percent of urotropin;
0.3% of polyoxyethylene fatty acid ether ester;
2% of mixed solution obtained by mixing the low-viscosity sodium carboxymethylcellulose and the hydrolyzed polyacrylonitrile ammonium salt according to the mass ratio of 1: 1;
enzyme doctor dr. nzyme200 (galactomannanase) 0.002%;
and the balance of oil field sewage at 40 ℃.
The fire flooding well self-degradation temporary plugging agent is prepared by the following specific steps:
(1) adding hydroxypropyl guar gum into oil field sewage at 40 ℃, fully stirring and dissolving for 10-15min, wherein the stirring speed is 100 r/min;
(2) sequentially adding urotropine, synthetic fatty acid resin, polyurethane fiber, sodium thiosulfate, polyoxyethylene fatty acid ether ester, mixed liquid obtained by mixing low-viscosity sodium carboxymethylcellulose and hydrolyzed polyacrylonitrile ammonium salt according to the mass ratio of 1:1, and enzyme doctor Dr. Nzyme200 into the solution;
(3) and (3) continuously stirring for 5min, and then adding organic boron to continuously stir to obtain the self-degradation temporary plugging agent for the fireflood well.
The fireflood well self-degradation temporary plugging agent prepared in the embodiment is used for core temporary plugging and damage evaluation experiments: measuring initial permeability K by positive displacement of kerosene after the rock core is saturated with formation water0(ii) a Temporary plugging agent reverse displacement for 2 hours, and forward kerosene test core permeability K1；
Positive kerosene displacement for 72 hours, core permeability Kod；
Calculating the temporary plugging rate Rzd＝(K0-K1)/K0；
Calculating the blockage removal rate Rd＝Kod/K0；
Calculation of Permeability injury Rate Rs＝100-RdThe data of the temporary plugging and damage evaluation test of the rock core are shown in table 3.
TABLE 3
| Core numbering | K0(md) | K1(md) | Kod(md) | Rzd(％) | Rd(％) | Rs(％) |
| 2018-a | 6.3 | 0.25 | 5.8 | 92.9 | 92.1 | 7.9 |
| 2018-b | 7.5 | 0.48 | 6.7 | 90.8 | 89.3 | 10.7 |
| 2018-c | 5.7 | 0.21 | 5.1 | 92.5 | 89.5 | 10.5 |
As can be seen from table 3, the temporary plugging rate of the self-degradable temporary plugging agent for a fireflood well prepared in example 3 is above 90% at a constant temperature of 60 ℃, and after 72 hours, the damage rate of the self-degradable temporary plugging agent for the fireflood well on the permeability of the rock core is lower than 11%.
Example 4
The viscosity and the highest temperature resistance of the fireflood well self-degradation temporary plugging agent prepared in example 3 after gelling are tested, and experimental data are shown in table 4.
TABLE 4
| Sample numbering | Temperature (. degree.C.) | Viscosity after gelling (mPa. s) | Thermostability (h) |
| 1# | 100 | 14520 | 78 |
| 2# | 110 | 13360 | 71 |
| 3# | 120 | 12530 | 67 |
| 4# | 130 | 11480 | 63 |
| 5# | 140 | 10600 | 52 |
| 6# | 150 | 8870 | 44 |
| 7# | 160 | 5600 | 32 |
As can be seen from table 4, the fireflood well self-degradation temporary plugging agent provided in example 3 has strong gelling strength below 150 ℃, and can play a plugging role in blastholes or zones near the wellbore.
Example 5
The dissolution performance of the oil-soluble particles (oil-soluble resin particles) used in the formulation of the fireflood well self-degrading temporary plugging agent in example 3 was tested, and the experimental data are shown in table 5.
TABLE 5
| Dissolution temperature (. degree.C.) | Name (R) | Dissolution medium | Mass before dissolution (g) | Mass after dissolution (g) | Dissolution rate (%) |
| 60 | Oil-soluble particles | Tap water | 3 | 2.4 | 20 |
| 60 | Oil-soluble particles | Oil field sewage | 3 | 1.3 | 57 |
| 60 | Oil-soluble particles | Crude oil | 3 | 0.9 | 70 |
As can be seen from table 5, the dissolution rate of the oil-soluble particles (oil-soluble resin particles) used for preparing the self-degradation temporary plugging agent for the fireflood well in example 3 in crude oil at 60 ℃ for 24 hours reaches 70%, which indicates that the oil-soluble particles used for preparing the temporary plugging agent in example 3 can be produced together with crude oil, no pollution is caused to an oil layer, and the oil-soluble particles entering a water layer can play a role in plugging a water outlet layer.
Example 6
In 2018, the fireflood well self-degradation temporary plugging agent prepared in example 3 is applied to the site of an oil production plant in an oil field of Liaohe river, a site test of 4 wells is carried out, the test effect is very ideal, and the obtained test data are shown in Table 6
TABLE 6
As can be seen from Table 6, the maximum oil jacket pressure of the four-port fire flooding first-line well is 4MPa before pump detection, the pressure is reduced to 0MPa after temporary plugging construction is finished, no gas is produced in the pump detection process, the construction process is very smooth, the average drainage period is 2d after the pump detection and pumping are finished, and the oil well is normally produced.
Claims (14)
1. The fireflood well self-degradation temporary plugging agent is characterized in that the total weight of the fireflood well self-degradation temporary plugging agent is 100%, and raw materials for preparing the fireflood well self-degradation temporary plugging agent comprise:
0.3 to 0.8 percent of main agent;
0.01 to 0.05 percent of cross-linking agent;
0.5-2% of oil-soluble resin;
fiber particles 0.2-0.6%;
0.02 to 0.1 percent of heat stabilizer;
0.1 to 0.5 percent of bactericide;
0.2 to 0.6 percent of cleanup additive;
1-3% of filtrate reducer;
0.001-0.004% of slow-release gel breaker;
and the balance water;
the main agent comprises one or the combination of two of industrial super guar gum or hydroxypropyl guar gum;
the cross-linking agent comprises one or the combination of borax and organic boron compound;
the oil-soluble resin comprises one or a combination of a plurality of alkyd resin, acrylic resin and synthetic fatty acid resin;
the fiber particles comprise one or a combination of more of polyvinyl alcohol fibers, modified polyester fibers and polyurethane fibers;
the heat stabilizer comprises one or the combination of two of 2-acrylamide-2-methyl propane sulfonic acid and sodium thiosulfate;
the slow-release gel breaker is biological enzyme, and the biological enzyme is biological enzyme with galactomannase as the main component.
2. The fireflood well self-degrading temporary plugging agent according to claim 1, wherein the fireflood well self-degrading temporary plugging agent is prepared by a preparation method comprising the following steps:
(1) adding the main agent into water, and fully stirring and dissolving to obtain a solution A;
(2) adding a bactericide, oil-soluble resin, fiber particles, a heat stabilizer, a cleanup additive, a filtrate reducer and a sustained-release gel breaker into the solution A to obtain a solution B;
(3) and stirring the solution B to uniformly mix the components, adding a cross-linking agent, and continuously stirring to prevent local cross-linking, thereby obtaining the self-degradation temporary plugging agent for the fireflood well.
3. The fireflood well self-degrading temporary plugging agent according to claim 1 or 2, wherein the particle size of the oil-soluble resin is 0.1-2 mm.
4. The fireflood well self-degrading temporary plugging agent according to claim 1 or 2, wherein the fiber length of the fiber particles is 3-15mm, the tensile strength of the fiber is 20-800MPa, and the fiber diameter is 10-100 μm.
5. The fireflood well self-degrading temporary plugging agent according to claim 1 or 2, wherein the bactericide comprises one or a combination of two of formaldehyde or urotropin.
6. The fireflood well self-degradation temporary plugging agent according to claim 1 or 2, wherein the cleanup additive comprises one or a combination of polyoxyethylene alkyl phenyl ether, polyoxyethylene alkyl ether, polyoxyethylene fatty acid ether ester and dodecyl trimethyl ammonium chloride.
7. The fireflood well self-degradation temporary plugging agent according to claim 1 or 2, wherein the fluid loss additive is a mixture obtained by mixing low-viscosity sodium carboxymethyl cellulose and hydrolyzed polyacrylonitrile ammonium salt according to a mass ratio of 1:2-2: 1.
8. The fireflood well self-degrading temporary plugging agent according to claim 1, wherein said biological enzyme is the enzyme Dr.
9. A method of preparing a fireflood well self-degrading temporary plugging agent according to any one of claims 1-8, comprising the steps of:
(1) adding the main agent into water, and fully stirring and dissolving to obtain a solution A;
(2) adding a bactericide, oil-soluble resin, fiber particles, a heat stabilizer, a cleanup additive, a filtrate reducer and a sustained-release gel breaker into the solution A to obtain a solution B;
(3) and stirring the solution B to uniformly mix the components, adding a cross-linking agent, and continuously stirring to prevent local cross-linking, thereby obtaining the self-degradation temporary plugging agent for the fireflood well.
10. The method according to claim 9, further comprising an operation of preparing the bactericide into an aqueous solution having a mass concentration of 37 to 40% and adding the aqueous solution to the solution a.
11. The method of claim 9 or 10, wherein the water has a temperature of not higher than 50 ℃oC。
12. The method of claim 11, wherein the water comprises clean water, tap water, or oilfield wastewater.
13. The method of claim 9 or 10, wherein the stirring is performed at a speed of 50 to 200r/min for 10 to 15 min.
14. Use of a fireflood well self-degrading temporary plugging agent according to any one of claims 1-8 in fireflood well pump or string operations.
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| CN110804427B (en) * | 2019-12-04 | 2022-02-01 | 中国石油天然气集团有限公司 | Degradable temporary plugging material for low-pressure gas well killing and preparation method thereof |
| CN111592867B (en) * | 2020-06-17 | 2021-05-25 | 西南石油大学 | Oil-based selective temporary plugging agent |
| CN111690391A (en) * | 2020-07-03 | 2020-09-22 | 北京金圣奥能源技术有限公司 | High-temperature-resistant tough degradable temporary plugging agent and preparation method thereof |
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| CN115678521B (en) * | 2022-11-03 | 2023-07-18 | 西南石油大学 | Temporary plugging agent for reservoir protection and preparation method thereof |
| CN116103027B (en) * | 2023-03-06 | 2024-07-02 | 深圳海程油田技术服务有限公司 | Liquid bridge plug and preparation method and application thereof |
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