CN105295879A - Oil well slow blocking remover suitable for acid-sensitive reservoir - Google Patents

Oil well slow blocking remover suitable for acid-sensitive reservoir Download PDF

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Publication number
CN105295879A
CN105295879A CN201510717409.XA CN201510717409A CN105295879A CN 105295879 A CN105295879 A CN 105295879A CN 201510717409 A CN201510717409 A CN 201510717409A CN 105295879 A CN105295879 A CN 105295879A
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acid
ammonium chloride
citric acid
reservoir
blocking
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CN201510717409.XA
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CN105295879B (en
Inventor
董光
李嘉瑞
屈玉凤
张永春
何青
刘威
王迁伟
王帆
高志军
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China Petroleum and Chemical Corp
Petroleum Engineering Technology Research Institute of Sinopec North China oil and Gas Co
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China Petroleum and Chemical Corp
Petroleum Engineering Technology Research Institute of Sinopec North China oil and Gas Co
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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
    • C09K8/52—Compositions for preventing, limiting or eliminating depositions, e.g. for cleaning
    • C09K8/528—Compositions for preventing, limiting or eliminating depositions, e.g. for cleaning inorganic depositions, e.g. sulfates or carbonates
    • 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
    • C09K8/52—Compositions for preventing, limiting or eliminating depositions, e.g. for cleaning
    • C09K8/524—Compositions for preventing, limiting or eliminating depositions, e.g. for cleaning organic depositions, e.g. paraffins or asphaltenes
    • 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
    • C09K2208/12—Swell inhibition, i.e. using additives to drilling or well treatment fluids for inhibiting clay or shale swelling or disintegrating
    • 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
    • C09K2208/32—Anticorrosion additives

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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)
  • Inorganic Chemistry (AREA)
  • Fats And Perfumes (AREA)
  • Detergent Compositions (AREA)

Abstract

The invention discloses oil well slow blocking remover suitable for an acid-sensitive reservoir, and belongs to the technical field of oilfield exploitation. The slow blocking remover is composed of preprocessing liquid, main processing liquid and post-processing liquid, the preprocessing liquid is prepared from glacial acetic acid, ammonium chloride, citric acid, water block removal agents, inhibitors and butyl cellosolve, the main processing liquid is prepared from citric acid, fluoroboric acid, ammonium chloride, water block removal agents, inhibitors and butyl cellosolve, and the post-processing liquid is prepared from glacial acetic acid, ammonium chloride, citric acid, water block removal agents, inhibitors and butyl cellosolve. According to the blocking remover, blocking removal treatment is conducted on the reservoir by means of acetic acid and the citric acid in three phases, the purpose of increasing the blocking removal depth is achieved by delaying the acidic rock reaction speed, blocking is removed, and damage caused to hydrochloric acid and hydrofluoric acid sensitive reservoir can be avoided simultaneously, efficient blocking removal to the reservoir is achieved, and single well yield is recovered and increased.

Description

Be applicable to the slow unblocking agent of oil well of acid-sensitive reservoir
Technical field
The present invention relates to the slow unblocking agent of oil well, be specifically related to a kind of slow unblocking agent of oil well being applicable to acid-sensitive reservoir, belong to oilfield exploitation technical field.
Background technology
In oil-field development drilling process, drilling fluid will certainly come in contact with the rock of reservoir and fluid, and the leakage of drilling fluid to reservoir may occur sometimes, especially for the horizontal well adopting staged fracturing to go into operation, enters reservoir by having a large amount of fracturing liquids.After reservoir and outside fluid come in contact, easily cause wettability modification, water lock, capillary pressure change etc., thus cause oil relative permeability to reduce, also likely cause clay swelling, fine migration, produce inorganic salt precipitation, emulsification of crude oil, there is wax and bituminous matter precipitation etc., these consequences all can cause blocking in various degree to reservoir throat, affect the seepage flow of crude oil to well, cause oil well output to decline.
Current oil field conventional with hydrochloric acid or hydrofluoric acid for main ingredient, the unblocking agent of collocation respective additive can remove the contamination and plugging of adjacent to oil well area, but this type of unblocking agent is not also suitable for acid-sensitive reservoir, if this type of unblocking agent is used to acid-sensitive reservoir, not only cannot reach the object removing contamination and plugging, also can produce secondary pollution blocking, if acid-rock reaction is too fast, also by causing the destruction of reservoir rock skeleton, secondary injury is caused to reservoir.Such as, disclosed in the patent of invention of publication No. CN103740353A a kind of composite blockage relieving agent, by pre-process liquid, main treatment solution, active blockages relieving fluid and subsequent fluid composition, wherein pre-process liquid and main treatment solution all comprise organic acid and inorganic acid constituent, organic acid is acetic acid, mineral acid is hydrochloric acid and hydrofluoric acid, this unblocking agent can be removed by conventional colloid, the blocking that bituminous matter and inorganic solid phase particle cause, retardative property is good, can also effectively prevent precipitation of iron ions and acid sludge from generating, be applicable to the de-plugging process of ultralow permeable reservoir staged fracturing operation horizontal well, but acid-sensitive reservoir can not be used for.
Summary of the invention
The object of this invention is to provide a kind of slow unblocking agent of oil well being applicable to acid-sensitive reservoir, this unblocking agent energy efficient solution is except adjacent to oil well area blocking, by slowing down acid-rock reaction speed, increasing plug removal radius raising plugging removal effect, and secondary injury can not be caused to reservoir.
In order to realize above object, the technical solution adopted in the present invention is:
Be applicable to the slow unblocking agent of oil well of acid-sensitive reservoir, by volume ratio be the pre-process liquid of 40 ~ 60:140 ~ 160:40 ~ 60, main body treatment solution and postpositive disposal liquid forms; Pre-process liquid is made up of the component of following mass percent: Glacial acetic acid 9 ~ 11%, ammonium chloride 0.8 ~ 1.2%, and citric acid 0.4 ~ 0.6%, Xie Shui locks agent 0.4 ~ 0.6%, inhibiter 0.4 ~ 0.6%, butyl glycol ether 0.4 ~ 0.6%, and surplus is water; Main body treatment solution is made up of the component of following mass percent: citric acid 3 ~ 5%, fluoroboric acid 3 ~ 5%, and ammonium chloride 0.8 ~ 1.2%, Xie Shui locks agent 0.4 ~ 0.6%, inhibiter 0.4 ~ 0.6%, butyl glycol ether 0.4 ~ 0.6%, and surplus is water; Postpositive disposal liquid is made up of the component of following mass percent: Glacial acetic acid 8 ~ 12%, ammonium chloride 0.8 ~ 1.2%, and citric acid 0.4 ~ 0.6%, Xie Shui locks agent 0.4 ~ 0.6%, and inhibiter 0.4 ~ 0.6%, butyl glycol ether 0.4 ~ 0.6%, surplus is water.
Preferably, in slow unblocking agent, pre-process liquid, postpositive disposal liquid are made up of the component of following mass percent respectively: Glacial acetic acid 10%, ammonium chloride 1%, and citric acid 0.5%, Xie Shui locks agent 0.5%, inhibiter 0.5%, butyl glycol ether 0.5%, and surplus is water; Main body treatment solution is made up of the component of following mass percent: citric acid 4%, fluoroboric acid 4%, and ammonium chloride 1%, Xie Shui locks agent 0.5%, and inhibiter 0.5%, butyl glycol ether 0.5%, surplus is water.
The agent of described Xie Shui lock is AS-3, AS-3 is a kind of tensio-active agent, and trade name: AS-3 water blocking damage treating agent, numbering: 1003, the added date: on August 10th, 2011, purchased from Dongying City Ao Sheng Chemical Co., Ltd..AS-3 can effectively reduce rock surface tension force and oil water interfacial tension, and reduction capillary resistance and working fluid return row pressure power, improves permeability to oil.
Described inhibiter is SJ-21, SJ-21 is a kind of quaternary ammonium salt, trade name: SJ-21 normal temperature acidification corrosion inhibitor, numbering: 2005, purchased from Shengli Oil Field circumference Chemical Co., Ltd..SJ-21 can effectively prevent unblocking agent to the corrosion of preparation of construction and metal pipe line.
Each section for the treatment of solution and each component effect are summarized as follows:
In pre-process liquid, acetic acid is mainly used in removing inorganic scale precipitation, and formation carries out pre-treatment, dissolves carbonate cementing matter and part in oil reservoir calcareous etc., avoids hydrofluoric acid to contact with it insolubless such as generating Calcium Fluoride (Fluorspan) and cause new blocking.
In main body treatment solution, citric acid can play the effect of Fe stabilizer, can play again the effect of corrosion rock, and simultaneously citric acid can multiple ionization, slows down acid-rock reaction speed, reaches and increase de-plugging EFFECTIVE RANGE object; Fluoroboric acid is hydrolyzed to low concentration hydrofluoric acid in water, and corrosion clay mineral and precipitation blocking, reach the object removing blocking.
In postpositive disposal liquid, acetic acid is for the residual carbon Carbonate Rocks cementing matter after dissolving pre-process liquid and main body treatment solution formation and processing and throw out.
Ammonium chloride is a kind of clay stabilizer, for suppressing clay swelling.
Butyl glycol ether is a kind of breakdown of emulsion mutual solvent, has anti-newborn demulsification, can eliminate the blocking of emulsification of crude oil thing, also the tensio-active agent desorption being adsorbed on reservoir rock surface can be got off, recover the wetting ability on reservoir rock surface, improve permeability to oil.
Beneficial effect of the present invention:
The present invention considers emphatically the blocking injury that may exist in oil development process, for hydrochloric acid and hydroflouric acid sensitivity reservoir characteristics optimization solution blocking agent component, acetic acid, citric acid and fluoroboric acid is utilized to divide three phases to carry out de-plugging process to reservoir, the object increasing the de-plugging degree of depth is reached by delaying acid-rock reaction speed, can avoid damaging hydrochloric acid and hydroflouric acid sensitivity reservoir while releasing blocking, realize the efficient de-plugging to reservoir, recover and improve per-well production.
Embodiment
Following embodiment is only described in further detail the present invention, but does not form any limitation of the invention.
Embodiment 1
Being applicable to the slow unblocking agent of oil well of acid-sensitive reservoir in the present embodiment, is 43m by volume 3, 155m 3, 40m 3pre-process liquid, main body treatment solution and postpositive disposal liquid composition; Pre-process liquid is made up of the component of following mass percent: Glacial acetic acid 9%, ammonium chloride 0.8%, citric acid 0.4%, AS-3 water blocking damage treating agent 0.4%, SJ-21 normal temperature acidification corrosion inhibitor 0.4%, butyl glycol ether 0.4%, and surplus is water; Main body treatment solution is made up of the component of following mass percent: citric acid 4%, fluoroboric acid 4%, ammonium chloride 1%, AS-3 water blocking damage treating agent 0.5%, SJ-21 normal temperature acidification corrosion inhibitor 0.5%, butyl glycol ether 0.5%, and surplus is water; Postpositive disposal liquid is made up of the component of following mass percent: Glacial acetic acid 12%, ammonium chloride 1.2%, and citric acid 0.6%, AS-3 water blocking damage treating agent 0.6%, SJ-21 normal temperature acidification corrosion inhibitor 0.6%, butyl glycol ether 0.6%, surplus is water.The compound method of each section for the treatment of solution is identical, stirs evenly by after each component mixing and get final product.
Using method is: for HH36P2 oil well, first with 0.6m during construction 3/ min discharge capacity injects pre-process liquid, 43m 3after pre-process liquid has all injected, with 1.1m 3/ min discharge capacity injects main body treatment solution, 155m 3after main body treatment solution has all injected, with 0.5m 3/ min discharge capacity injects 40m 3postpositive disposal liquid, and utilize active water postpositive disposal liquid all to be replaced closing well behind stratum to react 15 hours, trip out de-plugging tubing string, lower sucker rod post after reaction terminates.Before de-plugging, HH36P2 oil well day produce oil 0.15t/d, day produce oil 2.93t/d after de-plugging, increase day by day oily 2.78t/d.
Embodiment 2
Being applicable to the slow unblocking agent of oil well of acid-sensitive reservoir in the present embodiment, is 51m by volume 3, 153m 3, 49m 3pre-process liquid, main body treatment solution and postpositive disposal liquid composition; Pre-process liquid is made up of the component of following mass percent: Glacial acetic acid 10%, ammonium chloride 1.2%, citric acid 0.5%, AS-3 water blocking damage treating agent 0.6%, SJ-21 normal temperature acidification corrosion inhibitor 0.5%, butyl glycol ether 0.4%, and surplus is water; Main body treatment solution is made up of the component of following mass percent: citric acid 3%, fluoroboric acid 5%, ammonium chloride 0.8%, AS-3 water blocking damage treating agent 0.6%, SJ-21 normal temperature acidification corrosion inhibitor 0.4%, butyl glycol ether 0.6%, and surplus is water; Postpositive disposal liquid is made up of the component of following mass percent: Glacial acetic acid 10%, ammonium chloride 0.8%, and citric acid 0.6%, AS-3 water blocking damage treating agent 0.5%, SJ-21 normal temperature acidification corrosion inhibitor 0.4%, butyl glycol ether 0.5%, surplus is water.The compound method of each section for the treatment of solution is identical, stirs evenly by after each component mixing and get final product.
Using method is: for HH36P18 oil well, first with 0.7m during construction 3/ min discharge capacity injects pre-process liquid, 51m 3after pre-process liquid has all injected, with 1.3m 3/ min discharge capacity injects main body treatment solution, 153m 3after main body treatment solution has all injected, with 0.7m 3/ min discharge capacity injects 49m 3postpositive disposal liquid, and utilize active water postpositive disposal liquid all to be replaced closing well behind stratum to react 12 hours, trip out de-plugging tubing string, lower sucker rod post after reaction terminates.Before de-plugging, HH36P18 oil well day produce oil 0.85t/d, day produce oil 3.01t/d after de-plugging, increase day by day oily 2.16t/d.
Embodiment 3
Being applicable to the slow unblocking agent of oil well of acid-sensitive reservoir in the present embodiment, is 54m by volume 3, 157m 3, 46m 3pre-process liquid, main body treatment solution and postpositive disposal liquid composition; Pre-process liquid, postpositive disposal liquid are made up of the component of following mass percent respectively: Glacial acetic acid 10%, ammonium chloride 1%, citric acid 0.5%, AS-3 water blocking damage treating agent 0.5%, SJ-21 normal temperature acidification corrosion inhibitor 0.5%, butyl glycol ether 0.5%, surplus is water; Main body treatment solution is made up of the component of following mass percent: citric acid 4%, fluoroboric acid 4%, and ammonium chloride 1%, AS-3 water blocking damage treating agent 0.5%, SJ-21 normal temperature acidification corrosion inhibitor 0.5%, butyl glycol ether 0.5%, surplus is water.The compound method of each section for the treatment of solution is identical, stirs evenly by after each component mixing and get final product.
Using method is: for HH36P23 oil well, first with 0.8m during construction 3/ min discharge capacity injects pre-process liquid, 54m 3after pre-process liquid has all injected, with 1.2m 3/ min discharge capacity injects main body treatment solution, 157m 3after main body treatment solution has all injected, with 0.5m 3/ min discharge capacity injects 46m 3postpositive disposal liquid, and utilize active water postpositive disposal liquid all to be replaced closing well behind stratum to react 10 hours, trip out de-plugging tubing string, lower sucker rod post after reaction terminates.Before de-plugging, HH36P23 oil well day produce oil 0.35t/d, day produce oil 3.47t/d after de-plugging, increase day by day oily 3.12t/d.
Embodiment 4
Being applicable to the slow unblocking agent of oil well of acid-sensitive reservoir in the present embodiment, is 55m by volume 3, 156m 3, 52m 3pre-process liquid, main body treatment solution and postpositive disposal liquid composition; Pre-process liquid is made up of the component of following mass percent: Glacial acetic acid 11%, ammonium chloride 0.8%, citric acid 0.6%, AS-3 water blocking damage treating agent 0.5%, SJ-21 normal temperature acidification corrosion inhibitor 0.6%, butyl glycol ether 0.6%, and surplus is water; Main body treatment solution is made up of the component of following mass percent: citric acid 5%, fluoroboric acid 3%, ammonium chloride 1.2%, AS-3 water blocking damage treating agent 0.4%, SJ-21 normal temperature acidification corrosion inhibitor 0.6%, butyl glycol ether 0.4%, and surplus is water; Postpositive disposal liquid is made up of the component of following mass percent: Glacial acetic acid 8%, ammonium chloride 0.8%, and citric acid 0.4%, AS-3 water blocking damage treating agent 0.4%, SJ-21 normal temperature acidification corrosion inhibitor 0.5%, butyl glycol ether 0.4%, surplus is water.The compound method of each section for the treatment of solution is identical, stirs evenly by after each component mixing and get final product.
Using method is: for HH36P107 oil well, first with 0.6m during construction 3/ min discharge capacity injects pre-process liquid, 55m 3after pre-process liquid has all injected, with 1.0m 3/ min discharge capacity injects main body treatment solution, 156m 3after main body treatment solution has all injected, with 0.5m 3/ min discharge capacity injects 52m 3postpositive disposal liquid, and utilize active water postpositive disposal liquid all to be replaced closing well behind stratum to react 12 hours, trip out de-plugging tubing string, lower sucker rod post after reaction terminates.Before de-plugging, HH36P107 oil well day produce oil 0.88t/d, day produce oil 2.35t/d after de-plugging, increase day by day oily 1.47t/d.
In above-described embodiment 1 ~ 4, Glacial acetic acid (98%), ammonium chloride, citric acid, fluoroboric acid (30%) etc. are technical grade.
De-plugging benchmark test
Test method: take off formation core shown in table 1, the slow unblocking agent adopting embodiment 3 to prepare carries out de-plugging process, and measure core permeability change before and after de-plugging, and calculate resume permeability rate, test-results sees the following form 1.
Core permeability before and after table 1 de-plugging

Claims (4)

1. be applicable to the slow unblocking agent of oil well of acid-sensitive reservoir, it is characterized in that: by volume ratio be the pre-process liquid of 40 ~ 60:140 ~ 160:40 ~ 60, main body treatment solution and postpositive disposal liquid forms; Pre-process liquid is made up of the component of following mass percent: Glacial acetic acid 9 ~ 11%, ammonium chloride 0.8 ~ 1.2%, and citric acid 0.4 ~ 0.6%, Xie Shui locks agent 0.4 ~ 0.6%, inhibiter 0.4 ~ 0.6%, butyl glycol ether 0.4 ~ 0.6%, and surplus is water; Main body treatment solution is made up of the component of following mass percent: citric acid 3 ~ 5%, fluoroboric acid 3 ~ 5%, and ammonium chloride 0.8 ~ 1.2%, Xie Shui locks agent 0.4 ~ 0.6%, inhibiter 0.4 ~ 0.6%, butyl glycol ether 0.4 ~ 0.6%, and surplus is water; Postpositive disposal liquid is made up of the component of following mass percent: Glacial acetic acid 8 ~ 12%, ammonium chloride 0.8 ~ 1.2%, and citric acid 0.4 ~ 0.6%, Xie Shui locks agent 0.4 ~ 0.6%, and inhibiter 0.4 ~ 0.6%, butyl glycol ether 0.4 ~ 0.6%, surplus is water.
2. slow unblocking agent according to claim 1, it is characterized in that: pre-process liquid, postpositive disposal liquid are made up of the component of following mass percent respectively: Glacial acetic acid 10%, ammonium chloride 1%, citric acid 0.5%, Xie Shui locks agent 0.5%, inhibiter 0.5%, butyl glycol ether 0.5%, surplus is water; Main body treatment solution is made up of the component of following mass percent: citric acid 4%, fluoroboric acid 4%, and ammonium chloride 1%, Xie Shui locks agent 0.5%, and inhibiter 0.5%, butyl glycol ether 0.5%, surplus is water.
3. slow unblocking agent according to claim 1 and 2, is characterized in that: it is AS-3 that described Xie Shui locks agent.
4. slow unblocking agent according to claim 1 and 2, is characterized in that: described inhibiter is SJ-21.
CN201510717409.XA 2015-10-28 2015-10-28 Suitable for the slow de-plugging agent of oil well of acid-sensitive reservoir Active CN105295879B (en)

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Cited By (7)

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CN106367054A (en) * 2016-07-29 2017-02-01 中国石油集团川庆钻探工程有限公司工程技术研究院 Water block removing agent and preparation method thereof
CN107805493A (en) * 2017-11-10 2018-03-16 中石化石油工程技术服务有限公司 A kind of acetic acid mixture, retarded acidizing liquid and its compound method for being used to prepare retarded acidizing liquid
CN107987816A (en) * 2017-11-27 2018-05-04 延长油田股份有限公司 A kind of layer dredge method and selective acidizing additive
CN108822819A (en) * 2018-06-14 2018-11-16 兰州凯宏中原石油科技有限公司 A kind of super low percolation oilfield oil-water well combined removing plug by acid liquid
CN109181669A (en) * 2018-10-18 2019-01-11 陕西新奥石油工程有限公司 A kind of mating medicament and technique releasing reservoir water lock, blocking
CN112111258A (en) * 2019-06-19 2020-12-22 中国石油化工股份有限公司 Water-lock injury blocking remover, use method thereof and water-lock injury acidizing fluid
CN116591649A (en) * 2023-05-24 2023-08-15 固安国勘石油技术有限公司 Reservoir blocking and water locking agent for gas well, design method, preparation method and application

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Cited By (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN106367054A (en) * 2016-07-29 2017-02-01 中国石油集团川庆钻探工程有限公司工程技术研究院 Water block removing agent and preparation method thereof
CN106367054B (en) * 2016-07-29 2019-09-24 中国石油集团川庆钻探工程有限公司工程技术研究院 A kind of Xie Shui lock agent and preparation method
CN107805493A (en) * 2017-11-10 2018-03-16 中石化石油工程技术服务有限公司 A kind of acetic acid mixture, retarded acidizing liquid and its compound method for being used to prepare retarded acidizing liquid
CN107987816A (en) * 2017-11-27 2018-05-04 延长油田股份有限公司 A kind of layer dredge method and selective acidizing additive
CN108822819A (en) * 2018-06-14 2018-11-16 兰州凯宏中原石油科技有限公司 A kind of super low percolation oilfield oil-water well combined removing plug by acid liquid
CN109181669A (en) * 2018-10-18 2019-01-11 陕西新奥石油工程有限公司 A kind of mating medicament and technique releasing reservoir water lock, blocking
CN112111258A (en) * 2019-06-19 2020-12-22 中国石油化工股份有限公司 Water-lock injury blocking remover, use method thereof and water-lock injury acidizing fluid
CN112111258B (en) * 2019-06-19 2022-12-06 中国石油化工股份有限公司 Water-lock injury blocking remover, use method thereof and water-lock injury acidizing fluid
CN116591649A (en) * 2023-05-24 2023-08-15 固安国勘石油技术有限公司 Reservoir blocking and water locking agent for gas well, design method, preparation method and application
CN116591649B (en) * 2023-05-24 2023-11-21 固安国勘石油技术有限公司 Reservoir blocking and water locking agent for gas well, design method, preparation method and application

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