CN107739599A - A kind of high temperature low-density water shutoff agent and preparation method thereof and onsite application method - Google Patents
A kind of high temperature low-density water shutoff agent and preparation method thereof and onsite application method Download PDFInfo
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- CN107739599A CN107739599A CN201710950623.9A CN201710950623A CN107739599A CN 107739599 A CN107739599 A CN 107739599A CN 201710950623 A CN201710950623 A CN 201710950623A CN 107739599 A CN107739599 A CN 107739599A
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- high temperature
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- density
- water shutoff
- shutoff agent
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- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 title claims abstract description 177
- 239000003795 chemical substances by application Substances 0.000 title claims abstract description 84
- 238000002360 preparation method Methods 0.000 title claims abstract description 13
- 238000000034 method Methods 0.000 title claims abstract description 9
- 229920005989 resin Polymers 0.000 claims abstract description 21
- 239000011347 resin Substances 0.000 claims abstract description 21
- 229920000742 Cotton Polymers 0.000 claims abstract description 20
- VTYYLEPIZMXCLO-UHFFFAOYSA-L Calcium carbonate Chemical compound [Ca+2].[O-]C([O-])=O VTYYLEPIZMXCLO-UHFFFAOYSA-L 0.000 claims abstract description 16
- 239000003431 cross linking reagent Substances 0.000 claims abstract description 16
- 239000000835 fiber Substances 0.000 claims abstract description 3
- 229910000019 calcium carbonate Inorganic materials 0.000 claims abstract 2
- 238000010276 construction Methods 0.000 claims description 15
- 239000000243 solution Substances 0.000 claims description 12
- 238000013461 design Methods 0.000 claims description 10
- 239000007788 liquid Substances 0.000 claims description 9
- 239000002245 particle Substances 0.000 claims description 8
- 238000003756 stirring Methods 0.000 claims description 8
- QTBSBXVTEAMEQO-UHFFFAOYSA-N Acetic acid Chemical compound CC(O)=O QTBSBXVTEAMEQO-UHFFFAOYSA-N 0.000 claims description 6
- HEMHJVSKTPXQMS-UHFFFAOYSA-M Sodium hydroxide Chemical compound [OH-].[Na+] HEMHJVSKTPXQMS-UHFFFAOYSA-M 0.000 claims description 6
- 239000002253 acid Substances 0.000 claims description 6
- 238000006243 chemical reaction Methods 0.000 claims description 6
- 238000005516 engineering process Methods 0.000 claims description 6
- 238000000227 grinding Methods 0.000 claims description 6
- 239000000463 material Substances 0.000 claims description 6
- 230000008859 change Effects 0.000 claims description 5
- KRHYYFGTRYWZRS-UHFFFAOYSA-N Fluorane Chemical compound F KRHYYFGTRYWZRS-UHFFFAOYSA-N 0.000 claims description 4
- VEXZGXHMUGYJMC-UHFFFAOYSA-N Hydrochloric acid Chemical compound Cl VEXZGXHMUGYJMC-UHFFFAOYSA-N 0.000 claims description 4
- NBIIXXVUZAFLBC-UHFFFAOYSA-N Phosphoric acid Chemical compound OP(O)(O)=O NBIIXXVUZAFLBC-UHFFFAOYSA-N 0.000 claims description 4
- BRPQOXSCLDDYGP-UHFFFAOYSA-N calcium oxide Chemical group [O-2].[Ca+2] BRPQOXSCLDDYGP-UHFFFAOYSA-N 0.000 claims description 4
- 239000008235 industrial water Substances 0.000 claims description 4
- VTHJTEIRLNZDEV-UHFFFAOYSA-L magnesium dihydroxide Chemical compound [OH-].[OH-].[Mg+2] VTHJTEIRLNZDEV-UHFFFAOYSA-L 0.000 claims description 4
- 239000000347 magnesium hydroxide Substances 0.000 claims description 4
- 229910001862 magnesium hydroxide Inorganic materials 0.000 claims description 4
- 238000005259 measurement Methods 0.000 claims description 4
- 238000002156 mixing Methods 0.000 claims description 4
- 239000012267 brine Substances 0.000 claims description 3
- 239000000292 calcium oxide Substances 0.000 claims description 3
- ODINCKMPIJJUCX-UHFFFAOYSA-N calcium oxide Inorganic materials [Ca]=O ODINCKMPIJJUCX-UHFFFAOYSA-N 0.000 claims description 3
- 238000005553 drilling Methods 0.000 claims description 3
- 239000010865 sewage Substances 0.000 claims description 3
- HPALAKNZSZLMCH-UHFFFAOYSA-M sodium;chloride;hydrate Chemical compound O.[Na+].[Cl-] HPALAKNZSZLMCH-UHFFFAOYSA-M 0.000 claims description 3
- FYYHWMGAXLPEAU-UHFFFAOYSA-N Magnesium Chemical compound [Mg] FYYHWMGAXLPEAU-UHFFFAOYSA-N 0.000 claims description 2
- KWYUFKZDYYNOTN-UHFFFAOYSA-M Potassium hydroxide Chemical compound [OH-].[K+] KWYUFKZDYYNOTN-UHFFFAOYSA-M 0.000 claims description 2
- 229910000147 aluminium phosphate Inorganic materials 0.000 claims description 2
- RQPZNWPYLFFXCP-UHFFFAOYSA-L barium dihydroxide Chemical compound [OH-].[OH-].[Ba+2] RQPZNWPYLFFXCP-UHFFFAOYSA-L 0.000 claims description 2
- 229910001863 barium hydroxide Inorganic materials 0.000 claims description 2
- QVQLCTNNEUAWMS-UHFFFAOYSA-N barium oxide Inorganic materials [Ba]=O QVQLCTNNEUAWMS-UHFFFAOYSA-N 0.000 claims description 2
- CSSYLTMKCUORDA-UHFFFAOYSA-N barium(2+);oxygen(2-) Chemical compound [O-2].[Ba+2] CSSYLTMKCUORDA-UHFFFAOYSA-N 0.000 claims description 2
- AXCZMVOFGPJBDE-UHFFFAOYSA-L calcium dihydroxide Chemical compound [OH-].[OH-].[Ca+2] AXCZMVOFGPJBDE-UHFFFAOYSA-L 0.000 claims description 2
- 239000000920 calcium hydroxide Substances 0.000 claims description 2
- 229910001861 calcium hydroxide Inorganic materials 0.000 claims description 2
- 238000004132 cross linking Methods 0.000 claims description 2
- 238000004090 dissolution Methods 0.000 claims description 2
- 238000000703 high-speed centrifugation Methods 0.000 claims description 2
- 239000003350 kerosene Substances 0.000 claims description 2
- 239000011777 magnesium Substances 0.000 claims description 2
- 229910052749 magnesium Inorganic materials 0.000 claims description 2
- 229920003002 synthetic resin Polymers 0.000 claims description 2
- 239000000057 synthetic resin Substances 0.000 claims description 2
- 238000010792 warming Methods 0.000 claims description 2
- 240000007594 Oryza sativa Species 0.000 claims 1
- 235000007164 Oryza sativa Nutrition 0.000 claims 1
- WJEIYVAPNMUNIU-UHFFFAOYSA-N [Na].OC(O)=O Chemical compound [Na].OC(O)=O WJEIYVAPNMUNIU-UHFFFAOYSA-N 0.000 claims 1
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 claims 1
- 235000013339 cereals Nutrition 0.000 claims 1
- 229910052760 oxygen Inorganic materials 0.000 claims 1
- 239000001301 oxygen Substances 0.000 claims 1
- 235000009566 rice Nutrition 0.000 claims 1
- 239000003921 oil Substances 0.000 abstract description 33
- 230000015572 biosynthetic process Effects 0.000 abstract description 20
- 239000012530 fluid Substances 0.000 abstract description 17
- 238000004519 manufacturing process Methods 0.000 abstract description 17
- 230000005465 channeling Effects 0.000 abstract description 14
- 238000011161 development Methods 0.000 abstract description 7
- 238000011084 recovery Methods 0.000 abstract description 7
- 239000000295 fuel oil Substances 0.000 abstract description 6
- 150000003839 salts Chemical class 0.000 abstract description 4
- 239000003208 petroleum Substances 0.000 abstract description 2
- 238000007789 sealing Methods 0.000 abstract description 2
- 238000000605 extraction Methods 0.000 description 14
- 239000002981 blocking agent Substances 0.000 description 13
- 238000007711 solidification Methods 0.000 description 13
- 230000008023 solidification Effects 0.000 description 13
- 238000010793 Steam injection (oil industry) Methods 0.000 description 7
- 230000000694 effects Effects 0.000 description 7
- 230000018109 developmental process Effects 0.000 description 6
- 238000002347 injection Methods 0.000 description 6
- 239000007924 injection Substances 0.000 description 6
- 239000003129 oil well Substances 0.000 description 5
- 230000008901 benefit Effects 0.000 description 4
- 239000006260 foam Substances 0.000 description 4
- 238000010795 Steam Flooding Methods 0.000 description 3
- 239000010779 crude oil Substances 0.000 description 3
- 150000004676 glycans Chemical class 0.000 description 3
- 230000000813 microbial effect Effects 0.000 description 3
- 229920001282 polysaccharide Polymers 0.000 description 3
- 239000005017 polysaccharide Substances 0.000 description 3
- 230000008719 thickening Effects 0.000 description 3
- OYPRJOBELJOOCE-UHFFFAOYSA-N Calcium Chemical compound [Ca] OYPRJOBELJOOCE-UHFFFAOYSA-N 0.000 description 2
- 229920002558 Curdlan Polymers 0.000 description 2
- 239000001879 Curdlan Substances 0.000 description 2
- CPLXHLVBOLITMK-UHFFFAOYSA-N Magnesium oxide Chemical compound [Mg]=O CPLXHLVBOLITMK-UHFFFAOYSA-N 0.000 description 2
- CDBYLPFSWZWCQE-UHFFFAOYSA-L Sodium Carbonate Chemical compound [Na+].[Na+].[O-]C([O-])=O CDBYLPFSWZWCQE-UHFFFAOYSA-L 0.000 description 2
- 230000009471 action Effects 0.000 description 2
- WQZGKKKJIJFFOK-VFUOTHLCSA-N beta-D-glucose Chemical compound OC[C@H]1O[C@@H](O)[C@H](O)[C@@H](O)[C@@H]1O WQZGKKKJIJFFOK-VFUOTHLCSA-N 0.000 description 2
- 239000011575 calcium Substances 0.000 description 2
- 229910052791 calcium Inorganic materials 0.000 description 2
- 229940078035 curdlan Drugs 0.000 description 2
- 235000019316 curdlan Nutrition 0.000 description 2
- 238000002474 experimental method Methods 0.000 description 2
- 238000005189 flocculation Methods 0.000 description 2
- 230000016615 flocculation Effects 0.000 description 2
- 239000004088 foaming agent Substances 0.000 description 2
- JEGUKCSWCFPDGT-UHFFFAOYSA-N h2o hydrate Chemical compound O.O JEGUKCSWCFPDGT-UHFFFAOYSA-N 0.000 description 2
- 238000010438 heat treatment Methods 0.000 description 2
- 229910017053 inorganic salt Inorganic materials 0.000 description 2
- 230000007774 longterm Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 230000035699 permeability Effects 0.000 description 2
- 239000007787 solid Substances 0.000 description 2
- 238000012360 testing method Methods 0.000 description 2
- 229920001187 thermosetting polymer Polymers 0.000 description 2
- 230000007704 transition Effects 0.000 description 2
- KXGFMDJXCMQABM-UHFFFAOYSA-N 2-methoxy-6-methylphenol Chemical compound [CH]OC1=CC=CC([CH])=C1O KXGFMDJXCMQABM-UHFFFAOYSA-N 0.000 description 1
- PEDCQBHIVMGVHV-UHFFFAOYSA-N Glycerine Chemical compound OCC(O)CO PEDCQBHIVMGVHV-UHFFFAOYSA-N 0.000 description 1
- 230000032683 aging Effects 0.000 description 1
- 239000003513 alkali Substances 0.000 description 1
- 238000013459 approach Methods 0.000 description 1
- 230000000903 blocking effect Effects 0.000 description 1
- BVKZGUZCCUSVTD-UHFFFAOYSA-N carbonic acid Chemical compound OC(O)=O BVKZGUZCCUSVTD-UHFFFAOYSA-N 0.000 description 1
- 150000001875 compounds Chemical class 0.000 description 1
- 238000010924 continuous production Methods 0.000 description 1
- 238000012937 correction Methods 0.000 description 1
- 239000000839 emulsion Substances 0.000 description 1
- 238000005265 energy consumption Methods 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 239000003822 epoxy resin Substances 0.000 description 1
- 206010016256 fatigue Diseases 0.000 description 1
- 239000007789 gas Substances 0.000 description 1
- 230000005484 gravity Effects 0.000 description 1
- 230000036541 health Effects 0.000 description 1
- 229930195733 hydrocarbon Natural products 0.000 description 1
- 150000002430 hydrocarbons Chemical class 0.000 description 1
- 239000001257 hydrogen Substances 0.000 description 1
- 229910052739 hydrogen Inorganic materials 0.000 description 1
- 238000002513 implantation Methods 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 230000008595 infiltration Effects 0.000 description 1
- 238000001764 infiltration Methods 0.000 description 1
- 238000001802 infusion Methods 0.000 description 1
- 229910003480 inorganic solid Inorganic materials 0.000 description 1
- 150000002500 ions Chemical class 0.000 description 1
- 239000000395 magnesium oxide Substances 0.000 description 1
- 230000014759 maintenance of location Effects 0.000 description 1
- 239000000025 natural resin Substances 0.000 description 1
- 238000005325 percolation Methods 0.000 description 1
- 229920001568 phenolic resin Polymers 0.000 description 1
- 239000005011 phenolic resin Substances 0.000 description 1
- 239000002574 poison Substances 0.000 description 1
- 231100000614 poison Toxicity 0.000 description 1
- 229920000647 polyepoxide Polymers 0.000 description 1
- 229920000642 polymer Polymers 0.000 description 1
- 230000008569 process Effects 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- 239000002994 raw material Substances 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 230000000630 rising effect Effects 0.000 description 1
- 238000005204 segregation Methods 0.000 description 1
- 238000000926 separation method Methods 0.000 description 1
- 239000002002 slurry Substances 0.000 description 1
- 229910000029 sodium carbonate Inorganic materials 0.000 description 1
- 230000006641 stabilisation Effects 0.000 description 1
- 238000011105 stabilization Methods 0.000 description 1
- 238000010025 steaming Methods 0.000 description 1
- 238000003860 storage Methods 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 239000000725 suspension Substances 0.000 description 1
- 230000009466 transformation Effects 0.000 description 1
- 235000020681 well water Nutrition 0.000 description 1
- 239000002349 well water Substances 0.000 description 1
Classifications
-
- 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
-
- 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
-
- 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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- Life Sciences & Earth Sciences (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Geology (AREA)
- Mining & Mineral Resources (AREA)
- Fluid Mechanics (AREA)
- Environmental & Geological Engineering (AREA)
- Geochemistry & Mineralogy (AREA)
- Physics & Mathematics (AREA)
- Materials Engineering (AREA)
- Organic Chemistry (AREA)
- Edible Oils And Fats (AREA)
Abstract
The invention discloses a kind of high temperature low-density water shutoff agent and preparation method thereof and onsite application method, belong to petroleum works technical field.A kind of high temperature low-density water shutoff agent, including following components：Agstone, 100 parts by weight；Cotton fiber, 5~15 parts by weight；Oxide, 10~50 parts by weight；Oil-soluble resin, 5~15 parts by weight；High-temperature cross-linking agent, 1~3 parts by weight；The grain diameter of above each component is less than 47 microns, and the content of calcium carbonate is more than 95%wt in the agstone, and the content of fiber is more than 85%wt in the cotton fiber, and the content of the oxide is more than 95%wt.The high temperature prepared using water shutoff agent is low with low-density water shutoff agent fluid system viscosity, good fluidity, can carry out deep plugging adjustment；Salt tolerant, heatproof, effective time length, voltage endurance capability are strong；With selective water plugging function, the not stifled oil of water blockoff；More than 98% is reached to current permeable formation, channeling permeable formation sealing ratiod；Heavy oil production more than 50% is improved, reduces aquifer yield, improves recovery ratio, reduces development cost.
Description
Technical field
The present invention relates to a kind of high temperature low-density water shutoff agent and preparation method thereof and onsite application method, belong to oil work
Journey technical field.
Background technology
China's viscous crude resource reserve enriches, and about 250 × 108t, accounts for the 28% of total petroleum resources.Heavy crude producing and super-viscous oil
The best way of resource is oil recovery by heating, including steam soak and steam drive.But due to steam and viscous crude mobility difference and steaming
The factors such as the gravity segregation of vapour, in actual production, easily cause steam and fingering and channeling occur in high permeability formation, so as to reduce
Steam swept volume, has influence on steam utilization, and it is poor to ultimately result in thermal recovery effect, reduces heavy crude heat extraction yield and increase energy
Consumption.Channeling, water breakthrough, side bottom water coning etc. have turned into heavy oil development the most in stubborn problem, and thickened oil recovery urgently
The difficulty of solution.In the technical measures for solving these problems, water-plugging technique is that oil field improves waterflooding development effect, realizes oil reservoir
The effective means of stable yields.
Water blockoff is exactly to control water-oil factor or water production control, its essence is the flow behavior of water in the earth formation is changed, that is, is changed
The Percolation Law of water in the earth formation, prevent current by or change the direction of a stream of water.Water-blocking operation divides according to the difference of construction object
For oil well (producing well) water blockoff and the class of well (injection well) profile control two.The blocking agent type that the country mainly uses at present includes：It is inorganic
Salt blocking agent, Ploymer Gel Plugging Agent, resinae blocking agent, foam class profile-controlling and plugging agent etc..In the oil reservoir for high salinity
In water plugging profile control agent system, cross-linked polymeric species blocking agent due to its salt is quick, the flocculation of temperature-sensitive and multivalent ion etc. and make its application
Scope is restricted；Inorganic solid particles class envelope, which alters agent, has extraordinary heat resistance, but injection is poor, it is impossible to enters ground
Layer depth portion, block apart from short, steam continues coning after streaming；After particle plugging action, still there is fine gap, steam can still alter
Stream；Caused closure is non-selective permanent closure, oil reservoir is injured big.Its shortcoming of foam type blocking agent be shut-off capacity compared with
It is low；Foam stability is poor, to obtain preferable plugging effect, it is necessary to which implantation dosage is big, to maintain foam stabilization and processing week
Phase；Domestic alternative foaming agent is less, and foaming agent cost is higher.Resin type blocking agent be using phenolic resin, epoxy resin,
The materials such as Lauxite, by being formulated adjustment and setting, resin blocking agent is set to solidify within the default period of underground, formation has
High intensity and good heatproof, salt tolerant, the induration of ageing-resistant performance.The most of field application are thermosetting resins.Heat curing-type
Chemical change, gradual hardened forming are produced after resin heating, then is heated and does not also soften, can not be dissolved.Thermosetting resin shortcoming
It is that mechanical performance is poor.For microbial polysaccharide polymer profile-controlling and plugging agent system, the formula used at present has microbial polysaccharide
Curdlan is compounded with hydrogen bonding power accelerator or microbial polysaccharide curdlan and flocculation aid compound system.
The content of the invention
In order to solve the problems, such as water breakthrough, channeling present in heavy crude heat extraction production, carried by research and many experiments, the present invention
Going out a kind of there are raw material sources extensively to send out, simple production process, easy for construction, safety and environmental protection, meet heavy oil thermal recovery fleeing proof water blockoff
The high temperature of construction requirement low-density water shutoff agent, the high temperature low-density water shutoff agent fluid system viscosity prepared using water shutoff agent
It is low, good fluidity, deep plugging adjustment can be carried out；Salt tolerant, heatproof, effective time length, voltage endurance capability are strong；With selective water plugging work(
Can, the not stifled oil of water blockoff；More than 98% is reached to current permeable formation, channeling permeable formation sealing ratiod；Heavy oil production more than 50% is improved,
Aquifer yield is reduced, improves recovery ratio, reduces development cost.
In being produced the present invention relates to a kind of high temperature oil gas well, thick oil thermal extraction, for blocking high-temperature oil reservoir channeling layer, water breakthrough
Layer, water-yielding stratum；For adjusting the high-temperature steam swept volume of steam injection well；Adjust the intake profile of water injection well, oil-producing well
The water-plugging technique that water blockoff and oily edge water, bottom water, current are altered.
A kind of high temperature low-density water shutoff agent and preparation method thereof is provided, to solve water present in heavy crude heat extraction production
The problem of altering channeling.
The present invention is achieved by the following technical solution：A kind of high temperature low-density water shutoff agent, including following components：
Agstone, 100 parts by weight；Cotton fiber, 5~15 parts by weight；Oxide, 10~50 parts by weight；Oil-soluble resin, 5~15 weights
Measure part；High-temperature cross-linking agent, 1~3 parts by weight；The grain diameter of above each component is less than 47 microns, carbonic acid in the agstone
The content of calcium is more than 95%wt, and the content of fiber is more than 85%wt in the cotton fiber, and the content of the oxide is more than 95%
wt。
Further, the oil-soluble resin is natural resin and/or synthetic resin, and softening point is 100~300 Celsius
Degree, the dissolution rate in anhydrous kerosene are more than 90%wt；
Further, the oxide is calcium oxide, magnesia, barium monoxide, calcium hydroxide, magnesium hydroxide and barium hydroxide
At least one of；
A kind of preparation method present invention also offers high temperature with low-density water shutoff agent, comprises the following steps：
(1) appropriate agstone is taken, ultra-fine grinding to particle diameter is less than 47 microns；
(2) oxide is taken to be mixed with high-temperature cross-linking agent, ultra-fine grinding to particle diameter is less than 47 microns；
(3) cotton fiber is prepared：Cotton linter is taken, cotton linter is immersed in the acid solution of concentration 5~10%, it is warming up to 80~
90 degrees Celsius, soak 6~8 hours, by acid-treated cotton linter after high speed centrifugation dries, with the alkali that concentration is 15~30%
Solution is neutralized between pH value reaches 7~9, is dried；
(4) after dried cotton fiber is well mixed with oil-soluble resin by design flow, ultra-fine grinding to particle diameter is less than
47 microns；
(5) material made from the step of above-mentioned (1)-(4) is well mixed with design quantity, you can obtain high temperature low-density
Water shutoff agent；
(6) finally weigh, pack.
Further, after high-temperature cross-linking agent and oil-soluble resin cross-linking reaction, liquid volume increase by more than 5%, and 120
Occur fast chemical reaction more than degree Celsius, more than 360 degrees Celsius of the cross-linking agent heatproof of high-temperature cross-linking agent and oil-soluble resin.
Further, agstone：100 parts by weight, cotton fiber：13 parts by weight, oxide：40 parts by weight, oil-soluble tree
Fat：13 parts by weight, high-temperature cross-linking agent：2 parts by weight.
Further, the acid solution at least selects following one kind：Hydrochloric acid, phosphoric acid, hydrofluoric acid, acetic acid；Aqueous slkali is at least
Selection is following a kind of：Sodium hydroxide solution, sodium carbonate liquor, potassium hydroxide solution, magnesium hydroxide solution.
High temperature of the present invention with low-density water shutoff agent it is specific the advantages of it is as follows：
(1) high temperature prepared by the present invention is strong with low-density water shutoff agent heat-resisting ability, and water plugging effect is good, can effectively adjust
Steam injection profile, expand high-temperature steam swept volume, improve heavy oil production and thick oil recovery ratio, reduce heavy oil development cost.
(2) for the high temperature prepared by the present invention with low-density water shutoff agent in sour environment, most of material is acidified de-plugging, raw
Into soluble inorganic salt, preferable permeability is kept；
(3) present invention prepared by high temperature with low-density water shutoff agent in underground crude oil oil reservoir environment, high-temperature cross-linking agent etc.
Coated by crude oil, lather collapse, form " Water-In-Oil " reversed-phase emulsion, blocked high temperature low-density water shutoff agent to be chemically crosslinked
The approach of reaction, phase transformation will not be produced, not block oil flow channel, ground city is discharged during production of hydrocarbons, be advantageous to protection storage
Layer, has selective water plugging function；
(4) high temperature prepared by the present invention adds part oil-soluble resin with low-density water shutoff agent, and oil-soluble resin can be with
Dissolved in crude oil, do not block oil reservoir；
(5) the high temperature low-density water shutoff agent prepared by the present invention is detained and undergone phase transition in water breakthrough passage, is turned by liquid
Become solid, permanent plugging action is played to water stream channel；
(6) the high temperature low-density water shutoff agent prepared by the present invention can give full play to low density advantage, make it in oil reservoir
Separation layer is formed with water layer interface, effectively blocks the quick coning of bottom water.
(7) high temperature prepared by the present invention is simple with low-density water shutoff agent preparation technology, and Costco Wholesale is cheap.
Construction technology of the high temperature of the present invention with low-density water shutoff agent at the scene is as follows：
(a) industrial water of design flow is injected in 20~40 side's agitator tanks；
(b) under 100~500 revs/min of stirring, 20%wt~35%wt high temperature low-density water blockoff is added
Agent, charging rate are 25~50kg/ minutes；
(c) after high temperature has been added with low-density water shutoff agent, the performance such as stirring 30 minutes, measurement apparent viscosity, density is continued；
It is required that apparent viscosity 15mpa.s~80mpa.s；Density is less than 0.95g/cm3Adjusting performance；
(d) apparent viscosity increases high temperature low-density water shutoff agent dosage, wanted until reaching design if less than 15mpa.s
Ask；Apparent viscosity increases industrial water consumption, until reaching design requirement if greater than 80mpa.s；Density is more than 0.95g/cm3,
Increase mixing speed；
(e) and then according to tune deblocking technology, drilling leakage blockage construction is required.
In summary, after high temperature proposed by the present invention is stirred with low-density water shutoff agent in water, high temperature is formed with low
Density water shutoff agent fluid system, the system have preferable suspension stability, and density is low, can be stood for a long time under room temperature environment
Occur without obvious layering within more than two weeks, can meet that site operation blocking agent injection link and later stage long-acting closure link are noted to blocking agent
Enter the long-time stability requirement of fluid.
Fluid system of the high temperature proposed by the present invention after the preparation of low-density water shutoff agent, starts to be thickened more than 120 DEG C, with
The rising of temperature, thickening time shorten, are finally reached and are transformed into solid by liquid, play good plugging function.In high temperature bar
Under part, undergoing phase transition the time can adjust between 10 hours to 72 hours, can meet that the long-time closure of deep-well and ultradeep well is made
Industry construction requirement.Site operation safety, is widely used, economic benefit, social benefit are notable.
High temperature low-density water shutoff agent proposed by the present invention can be high by adjusting according to specific plugging construction job requirements
The temperature effective content of low-density water shutoff agent component, change the performances such as plugging agent bodying temperature, thickening time, thickening intensity and refer to
Mark.
Described heavy crude heat extraction high temperature after the completion of preparation, is injected into viscous crude steam with low-density water shutoff agent fluid system
Drive thermal production well and carry out water plugging and profile controlling, heavy crude heat extraction high temperature proposed by the present invention with low-density water shutoff agent fluid system at the scene
Using.
Described heavy crude heat extraction high temperature has preferable mobility, viscosity at normal temperatures with low-density water shutoff agent fluid system
15mPa.s-80mPa.s, 0.85~0.95g/cm3 of density, it is easy to prepare, is easy to infusion, is easy to construct, is easy to deep plugging adjustment.
For described heavy crude heat extraction high temperature with low-density water shutoff agent fluid system because viscosity is relatively low, density is low, can quickly note
Enter into thick oil steam drive thermal production well, because the viscosity differences of viscous crude and stratum water are big, blocking agent fluid selectivity enters oil
Water breakthrough passage in well, under the promotion of rear injection fluid, water shutoff agent fluid enters the deep of water breakthrough passage, small in formation temperature
In the environment of 100 DEG C, the long-term retention property of blocking agent fluid is stable.After injecting steam, formation temperature rise, with oil well production
Process continues several cycles, and edge-bottom water starts to coning around producing well, promotes blocking agent fluid to be flowed to the higher environment of temperature.
Blocking agent crosslinks reaction, viscosity rapid increase, forms induration, block the generation of water breakthrough under the exciting of high temperature, so as to rise
To the effect blocked for a long time.
Site operation can select industry water, stratum sewage, high-salinity brine etc. with liquid water.Stratum sewage is next
From the oil-polluted water during oil development.The total salinity of high-salinity brine is less than 200,000 mg/L, wherein calcium and magnesium ore deposit
Change degree is less than 10,000 mg/L.Adjust stifled slurry performance unaffected with low-density high temperature using the heavy crude heat extraction of above liquid dosage, adjust stifled
Performance indications can meet construction operation requirement.Therefore, described heavy crude heat extraction high temperature low-density water shutoff agent fluid system pair
Requirement with liquid stream body is relatively low, and the profile control and water plugging construction operation and drilling well that can be widely applied to the region such as ocean, desert oil well block up
Leakage.Described heavy crude heat extraction high temperature is low with low-density water shutoff agent fluid system density, can be widely applied to low pressure reservoir, bottom water
The plug water constructions such as oil reservoir.Described heavy crude heat extraction high temperature low-density water shutoff agent fluid system does not have any poison secondary to human body
Effect, so as to ensure that the requirement of the health and safety of construction worker.
Embodiment
Below by non-limiting embodiment, the present invention is further illustrated：
Test data when being each component different content in high temperature low-density water shutoff agent of the present invention below.
(1) embodiment 1
1) preparing high-temp low-density water shutoff agent is matched somebody with somebody according to following different component content：Agstone, 100 parts by weight；Cotton is fine
(the two 1 with oil-soluble resin for dimension：1)：20 parts by weight；(the two 40 with high-temperature cross-linking agent for calcium oxide：2)：42 parts by weight；Will be above-mentioned
Material mixing, stir, obtain high temperature low-density water shutoff agent.
2) high temperature is prepared with low-density water shutoff agent water blockoff system：In the water of metering, be separately added into 10%, 13%, 15%,
18%th, 20%, 25%, 30%, 35%, 40% high temperature low-density water shutoff agent.
3) high temperature low-density water shutoff agent is added in water, 100-500 revs/min of rotating speed, is persistently stirred 2 hours, to each group
Divide dispersed, measurement performance.
4) gained high temperature is measured into apparent viscosity, density with low-density water blockoff system at room temperature, is shown in Table 1；
The different dosage viscosity/density values at room temperature of table 1
Middle gained high temperature is stood, after constant temperature 48 hours under confined conditions with low-density water blockoff system at 80 DEG C.Its is cold
But to room temperature, stir 2 hours respectively, measure apparent viscosity/density, be shown in Table 2；
Different dosage viscosity/density values under the conditions of 2 80 DEG C of table
The dosage of high temperature low-density water shutoff agent is can be seen that from table 1, the data of table 2 to be controlled below 30%, make it
Preferable mobility is kept, reaches the purpose of deep plugging adjustment.
5) gained high temperature is being stood, after constant temperature 24 hours under confined conditions with low-density water blockoff system at 150 DEG C, by it
Room temperature is cooled to, observes respectively, measure the high temperature solidification situation of low-density water blockoff system, be shown in Table 3；
Different dosage viscosity/density values under the conditions of 3 150 DEG C of table
As can be seen from Table 3, the dosage of high temperature low-density water shutoff agent, formation temperature is under the conditions of 150 DEG C, it should
Control makes it keep preferable mobility below 25%, reaches the purpose of deep plugging adjustment.
6) gained high temperature is being stood, after constant temperature 24 hours under confined conditions with low-density water blockoff system at 250 degree, by it
Room temperature is cooled to, observes respectively, measure the high temperature solidification situation of low-density water blockoff system, be shown in Table 4；
Different dosage viscosity/density values under the conditions of 4 250 DEG C of table
As can be seen from Table 4, the dosage of high temperature low-density water shutoff agent, should under the conditions of formation temperature is 250 DEG C
The control makes it keep preferable mobility below 20%, reaches the purpose of deep plugging adjustment.
7) gained high temperature is being stood, after constant temperature 24 hours under confined conditions with low-density water blockoff system at 360 degree, by it
Room temperature is cooled to, observes respectively, measure the high temperature solidification situation of low-density water blockoff system, be shown in Table 5；
Different dosage viscosity/density values under the conditions of 5 360 DEG C of table
As can be seen from Table 5, the dosage of high temperature low-density water shutoff agent, should under the conditions of formation temperature is 360 DEG C
The control makes it keep preferable mobility below 15%, reaches the purpose of deep plugging adjustment.
8) gained high temperature is being stood, after constant temperature 24 hours under confined conditions with low-density water blockoff system at 400 DEG C, by it
Room temperature is cooled to, observes respectively, measure the high temperature solidification situation of low-density water blockoff system, be shown in Table 6；
Different dosage viscosity/density values under the conditions of 6 400 DEG C of table
As can be seen from Table 6, the dosage of high temperature low-density water shutoff agent, should under the conditions of formation temperature is 400 DEG C
The control makes it keep preferable mobility below 13%, reaches the purpose of deep plugging adjustment.
9) gained high temperature is being stood, after constant temperature 24 hours under confined conditions with low-density water blockoff system at 360 DEG C, by it
Room temperature is cooled to, observes respectively, measure the high temperature solidification situation of low-density water blockoff system, be shown in Table 7；
Solidify situation under the conditions of 7 360 DEG C of table
As can be seen from Table 7, the dosage of high temperature low-density water shutoff agent reaches 20%, is 360 DEG C in formation temperature
Under the conditions of, there is very strong solidification intensity, fully meet high temperature water blockoff envelope and alter requirement.
(2) embodiment 2
1) high temperature low-density water shutoff agent is produced according to following different component content：Agstone, 100 parts by weight；Cotton is fine
(the two 1 with oil-soluble resin for dimension：1), 10 parts by weight；(the two 40 with high-temperature cross-linking agent for calcium oxide：2), 21 parts by weight；Will be above-mentioned
Material mixing, stir, obtain high temperature low-density water shutoff agent.
2) high temperature is prepared with low-density water shutoff agent system：In the water of metering, be separately added into 10%, 13%, 15%,
18%th, 20%, 25%, 30%, 35%, 40% high temperature low-density water shutoff agent.
3) high temperature low-density water shutoff agent is added in water, 100-500 revs/min of rotating speed, is persistently stirred 2 hours, to each group
Divide dispersed, measurement performance.
4) gained high temperature is measured into apparent viscosity/density with low-density water blockoff system at room temperature, is shown in Table 8；
The different dosage viscosity/density values at room temperature of table 8
4) gained high temperature is being stood, after constant temperature 48 hours under confined conditions with low-density water blockoff system at 80 DEG C, respectively
Stirring 2 hours, is cooled to room temperature, observes respectively, measures the high temperature solidification situation of low-density water blockoff system, is shown in Table 9；
Different dosage viscosity/density values under the conditions of 9 80 DEG C of table
The dosage of high temperature low-density water shutoff agent is can be seen that from table 8, the data of table 9 to be controlled below 35%, make it
Preferable mobility is kept, reaches the purpose of deep plugging adjustment.
5) gained high temperature is being stood, after constant temperature 24 hours under confined conditions with low-density water blockoff system at 150 DEG C, by it
Room temperature is cooled to, observes respectively, measure the high temperature solidification situation of low-density water blockoff system, be shown in Table 10；
Different dosage viscosity/density values under the conditions of 10 150 DEG C of table
As can be seen from Table 10, the dosage of high temperature low-density water shutoff agent, formation temperature, should under the conditions of 150 DEG C
The control makes it keep preferable mobility below 35%, reaches the purpose of deep plugging adjustment.
6) gained high temperature is being stood, after constant temperature 24 hours under confined conditions with low-density water blockoff system at 250 degree, by it
Room temperature is cooled to, observes respectively, measure the high temperature solidification situation of low-density water blockoff system, be shown in Table 11；
Different dosage viscosity/density values under the conditions of 11 250 DEG C of table
The dosage of high temperature low-density water shutoff agent is can be seen that from the data of table 11, under the conditions of formation temperature is 250 DEG C,
It should control below 25%, it is kept preferable mobility, reach the purpose of deep plugging adjustment.
7) gained high temperature is being stood, after constant temperature 24 hours under confined conditions with low-density water blockoff system at 360 degree, by it
Room temperature is cooled to, observes respectively, measure the high temperature solidification situation of low-density water blockoff system, be shown in Table 12；
Different dosage viscosity/density values under the conditions of 12 360 DEG C of table
The dosage of high temperature low-density water shutoff agent is can be seen that from the data of table 12, under the conditions of formation temperature is 360 DEG C,
It should control below 20%, it is kept preferable mobility, reach the purpose of deep plugging adjustment.
8) gained high temperature is stood, after constant temperature 24 hours under confined conditions with low-density water blockoff system at 400 DEG C, its is cold
But to room temperature, observe respectively, measure the high temperature solidification situation of low-density water blockoff system, be shown in Table 13；
Different dosage viscosity/density values under the conditions of 13 400 DEG C of table
The dosage of high temperature low-density water shutoff agent is can be seen that from the data of table 13, under the conditions of formation temperature is 400 DEG C,
It should control below 15%, it is kept preferable mobility, reach the purpose of deep plugging adjustment.
9) gained high temperature is stood, after constant temperature 24 hours under confined conditions with low-density water blockoff system at 360 DEG C, its is cold
But to room temperature, observe respectively, measure the high temperature solidification situation of low-density water blockoff system, be shown in Table 14；
Solidify situation under the conditions of 14 360 DEG C of table
The dosage that high temperature low-density water shutoff agent is can be seen that from the data of table 14 reaches 30%, is 360 DEG C in formation temperature
Under the conditions of, there is very strong solidification intensity, fully meet high temperature water blockoff envelope and alter requirement.
Analyzed from embodiment 1 and the correction data of embodiment 2, embodiment 1, dosage is few, and water plugging effect is good；
Embodiment 2, dosage is big, and cost is high.
(3) field test situation is as follows：
(1) the water blockoff experiment of side water water logging dead well
C puts down 17 wells：Development layer position shop one, net horizontal section perforating length 150m, the horizontal well are in side waterside edge.
Well steam injection in July, 2005, for opening well and making production after 153 days, water content rises to 100% by 56%, is forced to stop production.
Stop production day before yesterday liquid 83.1t/d, day oil 0t/d, and aqueous 100%.Through analyzing the well influenceed by the block south water coning, it is horizontal
Section multi-stage outlet.
On December 1st, 2015,17 wells are put down to C and carry out suppressing side water plug water construction, inject water shutoff agent system 280m3, row altogether
10-20m3/h is measured, injection pressure is increased to 6.5MPa from 4MPa.
On December 20th, 2015, after steam injection is gone into operation, day at initial stage 10.2 tons of oil-producing, current 5.0 tons or so of day oil-producing, water content
Less than 70%, continuous production nearly two year, water layer are effectively blocked.
(2) oil reservoir bottom water water logging oilwell water shutoff is tested
Qinghe M-X16 wells are gone into operation for 2009,1700 tons of oil-producing are tired out in December, 2010, because oil reservoir bottom water coning, aqueous
Amount is quickly increased to 100%, is forced long-term shutdowns by the 22% of producing initial stage.In July, 2016 uses high temperature low-density water blockoff
System implementation bottom water plugging is constructed, and the well injects high temperature low-density water blockoff system 150m3 altogether, after operation, produces liquid peak period daily
36.2t/d, day oil 18.4t/d, aqueous 49.2%.To in June, 2017, well day oil-producing 7.6t/d, aqueous 78%.
(3) oil well channeling passage plugging is tested
41 meters of B509-X100 wells and B509-X51 well target spots distance, occur channeling during heat extraction by steam injection, 2016 3
The moon in September, 2016, is influenceed, B509-X51 wells stop production 200 days, influence 450 tons of crude output by B509-X100 channelings.2017
January in year is constructed using high temperature with low-density water blockoff system implementation bottom water plugging, and the well injects high temperature low-density water blockoff system altogether
80m3, B509-X100 well steam injection pressures grow steadily in steam injection process, 16.3 MPas are risen to by 15 MPas, by channeling well
B509-X51 wells are normally produced, and do not influence yield, end in August, 2017, and still normal production, channeling passage is effectively blocked.
Therefore, high temperature low-density water shutoff agent system can be extensively using the plug water construction under following complex situations：(1) side water
It is quick-fried to flood water exit interval water blockoff；(2) the quick-fried waterflooding of bottom water section water blockoff layer by layer；(3) macropore water layer section water blockoff；(4) heavy crude heat extraction is taken turns more
Handle up well water exit interval water blockoff；(5) steam drives the closure of section has channeling layer；(6) high, middle infiltration water-yielding stratum water blockoff；(7) casing damage leaks
Lose the closure of layer position；(7) sleeve pipe has channeling passage plugging etc..
The embodiment of the present invention is the foregoing is only, is not intended to limit the invention, for this area
For technical staff, the present invention can have various modifications and variations.That is made within the spirit and principles of the invention is any
Modification, equivalent substitution, improvement etc., should be included in the scope of the protection.
Claims (9)
1. a kind of high temperature low-density water shutoff agent, it is characterised in that including following components：
Agstone, 100 parts by weight；
Cotton fiber, 5~15 parts by weight；
Oxide, 10~50 parts by weight；
Oil-soluble resin, 5~15 parts by weight；
High-temperature cross-linking agent, 1~3 parts by weight；
For the grain diameter of above each component less than 47 microns, the content of calcium carbonate is more than 95%wt in the agstone, described
The content of fiber is more than 85%wt in cotton fiber, and the content of the oxide is more than 95%wt.
2. high temperature according to claim 1 low-density water shutoff agent, it is characterised in that the oil-soluble resin is natural tree
Fat and/or synthetic resin, softening point are 100~300 degrees Celsius, and the dissolution rate in anhydrous kerosene is more than 90%wt.
3. high temperature according to claim 1 low-density water shutoff agent, it is characterised in that the oxide is calcium oxide, oxygen
Change at least one of magnesium, barium monoxide, calcium hydroxide, magnesium hydroxide and barium hydroxide.
4. the high temperature preparation method of low-density water shutoff agent described in a kind of any one of claims 1 to 3, comprises the following steps：
(1) appropriate agstone is taken, ultra-fine grinding to particle diameter is less than 47 microns；
(2) oxide is taken to be mixed with high-temperature cross-linking agent, ultra-fine grinding to particle diameter is less than 47 microns；
(3) cotton fiber is prepared：Cotton linter is taken, cotton linter is immersed in the acid solution of concentration 5~10%, 80~90 is warming up to and takes the photograph
Family name's degree, soak 6~8 hours, by acid-treated cotton linter after high speed centrifugation dries, with the aqueous slkali that concentration is 15~30%
It is neutralized between pH value reaches 7~9, dries；
(4) after dried cotton fiber is well mixed with oil-soluble resin by design flow, it is micro- that ultra-fine grinding to particle diameter is less than 47
Rice；
(5) material made from the step of above-mentioned (1)-(4) is well mixed with design quantity, you can obtain high temperature low-density water blockoff
Agent；
(6) finally weigh, pack.
5. the high temperature according to claim 4 preparation method of low-density water shutoff agent, it is characterised in that high-temperature cross-linking agent with
After oil-soluble resin cross-linking reaction, liquid volume increase by more than 5%, and fast chemical reaction occurs more than 120 degrees Celsius, it is high
More than 360 degrees Celsius of the cross-linking agent heatproof of warm crosslinking agent and oil-soluble resin.
6. the high temperature according to claim 4 preparation method of low-density water shutoff agent, it is characterised in that agstone：100
Parts by weight, cotton fiber：13 parts by weight, oxide：40 parts by weight, oil-soluble resin：13 parts by weight, high-temperature cross-linking agent：2 weight
Part.
7. the high temperature according to claim 4 preparation method of low-density water shutoff agent, it is characterised in that the acid solution is extremely
Few selection is following a kind of：Hydrochloric acid, phosphoric acid, hydrofluoric acid, acetic acid；Aqueous slkali at least selects following one kind：Sodium hydroxide solution, carbonic acid
Sodium solution, potassium hydroxide solution, magnesium hydroxide solution.
8. the onsite application method of the high temperature low-density water shutoff agent prepared by a kind of claim 4, it is characterised in that specific
Construction technology is as follows：
(a) industrial water of design flow is injected in 20~40 side's agitator tanks；
(b) under 100~500 revs/min of stirring, 20%wt~35%wt high temperature low-density water shutoff agent is added,
Charging rate is 25~50kg/ minutes；
(c) after high temperature has been added with low-density water shutoff agent, the performance such as stirring 30 minutes, measurement apparent viscosity, density is continued；It is required that
Apparent viscosity 15mpa.s~80mpa.s；Density is less than 0.95g/cm3 adjusting performances；
(d) apparent viscosity increases high temperature low-density water shutoff agent dosage, until reaching design requirement if less than 15mpa.s；Table
Viscosity is seen if greater than 80mpa.s, increases industrial water consumption, until reaching design requirement；Density is more than 0.95g/cm3, increase
Mixing speed；
(e) and then according to tune deblocking technology, drilling leakage blockage construction is required.
9. the onsite application method of high temperature according to claim 8 low-density water shutoff agent, it is characterised in that the industry
Stratum sewage or high-salinity brine are replaced with water.
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| CN111592867A (en) * | 2020-06-17 | 2020-08-28 | 西南石油大学 | Oil-based selective temporary plugging agent |
| CN112500841A (en) * | 2020-12-15 | 2021-03-16 | 济源市宏鑫实业有限公司 | Efficient plugging agent for offshore oil exploitation and preparation method thereof |
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| CN114316931A (en) * | 2021-11-22 | 2022-04-12 | 中国海洋石油集团有限公司 | Selective organic particle plugging agent for high-temperature high-salinity fractured oil reservoir and preparation method thereof |
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| CN109113698A (en) * | 2018-10-20 | 2019-01-01 | 西南石油大学 | A kind of profile control method based on temperature control phase-change material |
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| CN112983343A (en) * | 2019-12-17 | 2021-06-18 | 中国石油化工股份有限公司 | Water plugging method for oil well of carbonate rock solution-breaking oil reservoir |
| CN111592867A (en) * | 2020-06-17 | 2020-08-28 | 西南石油大学 | Oil-based selective temporary plugging agent |
| CN111592867B (en) * | 2020-06-17 | 2021-05-25 | 西南石油大学 | Oil-based selective temporary plugging agent |
| CN112500841A (en) * | 2020-12-15 | 2021-03-16 | 济源市宏鑫实业有限公司 | Efficient plugging agent for offshore oil exploitation and preparation method thereof |
| CN112500841B (en) * | 2020-12-15 | 2022-09-13 | 济源市宏鑫实业有限公司 | Efficient plugging agent for offshore oil exploitation and preparation method thereof |
| CN113403049A (en) * | 2021-07-06 | 2021-09-17 | 东营汇聚丰石油科技有限公司 | Low-density water shutoff agent for high temperature and preparation method and field use method thereof |
| CN114316931A (en) * | 2021-11-22 | 2022-04-12 | 中国海洋石油集团有限公司 | Selective organic particle plugging agent for high-temperature high-salinity fractured oil reservoir and preparation method thereof |
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