CN108019192B - A kind of hydroexpanding body blocking agent profile control blocking removal of bridge formation method - Google Patents
A kind of hydroexpanding body blocking agent profile control blocking removal of bridge formation method Download PDFInfo
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- CN108019192B CN108019192B CN201610942445.0A CN201610942445A CN108019192B CN 108019192 B CN108019192 B CN 108019192B CN 201610942445 A CN201610942445 A CN 201610942445A CN 108019192 B CN108019192 B CN 108019192B
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- Prior art keywords
- blocking agent
- profile control
- well
- gel breaker
- hydroexpanding body
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Classifications
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- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21B—EARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B43/00—Methods or apparatus for obtaining oil, gas, water, soluble or meltable materials or a slurry of minerals from wells
- E21B43/16—Enhanced recovery methods for obtaining hydrocarbons
- E21B43/20—Displacing by water
Abstract
The invention discloses a kind of hydroexpanding body blocking agent profile controls to block removal of bridge formation method, comprising the following steps: (1) is blocked by plunger pump to hydroexpanding body blocking agent profile control and generally inject oxidation gel breaker in well, reinject the water of equivalent, closing well reacts 6 days；(2) into hydroexpanding body blocking agent profile control blocking well, generally injection aoxidizes gel breaker again, reinjects the water of equivalent, and closing well reacts 5 days；(3) nitrogen is injected into hydroexpanding body blocking agent profile control blocking well；(4) hydrochloric acid is injected into hydroexpanding body blocking agent profile control blocking well；(5) mud acid is injected into hydroexpanding body blocking agent profile control blocking well；The water of equivalent is reinjected, is reacted 1 hour；(6) row of returning；(7) restore water filling.Hydroexpanding body profile control blocking well is handled using method of the invention, aoxidize gel breaker can it is degradable fall near wellbore zone hydroexpanding body blocking agent in organic principle, inorganic constituents in hydrochloric acid and mud acid energy corrosion hydroexpanding body blocking agent thoroughly eliminates blocking of the hydroexpanding body blocking agent to stratum.
Description
Technical field
The present invention relates to a kind of removal of bridge formation methods more particularly to a kind of hydroexpanding body blocking agent profile control to block removal of bridge formation side
Method.
Background technique
Due to the influence of the heterogeneity and Development Factors of water-drive pool itself, the generally existing injection water in each oil field in China
Involve the lower problem of degree.The many waterflooding oil fields of east China enter ultra-high water cut stage, and a large amount of water that injects is along height
Permeable formation channelling, and less permeable layer is seldom fed through to, and the utilization rate of injection water is greatly reduced.Profile control technique is that oil field improves
Waterflooding development effect, the effective means for realizing oil reservoir stable yields.
The use of hydroexpanding body blocking agent profile control is a kind of novel Novel technique of in-depth profile control, primarily directed to heterogeneity strong, High water cut,
Oil field deep profile control, improving ecology development effectiveness and the innovative technology researched and developed of macropore development.Hydroexpanding body blocking agent particle meets oil
Constancy of volume and water-absorbing body is swollen softens (but insoluble), can deform migrate to earth formation deep under external force, hypertonic
Flow resistance is generated in layer or macropore, makes to be subsequently implanted into the steering of moisture stream, effectively change earth formation deep long-period water drive is formed fixed
The pressure field and streamline field of gesture achieve the purpose that realize deep profile controlling, improve swept volume, improving ecology development effectiveness.Water is swollen
Body blocking agent particle contains it in height because of its excellent performance, extensive oil reservoir conformability and completely new " amoeba " mechanism of action
Effect in water, macropore oil field deep profile control is widely recognized as, it has also become China's High water cut, high recovery percent of reserves oil field carry out deep
Portion taps the latent power, realizes the important technical of stable yields.
But exactly because also hydroexpanding body blocking agent has excellent stability under formation conditions, in hydroexpanding body blocking agent tune
In the mining site practice cutd open, it is commonly encountered hydroexpanding body blocking agent blocking stratum, causes the well injection pressure in later period high and stops infusing.Existing skill
There has been no the open reports about varicosity blocking agent profile control blocking removal of bridge formation method in art.For this reason, it may be necessary to invent a kind of hydroexpanding body
Blocking agent profile control blocks removal of bridge formation method, formation blockage when solving the problems, such as hydroexpanding body blocking agent profile control.
Summary of the invention
For the above-mentioned prior art, the present invention provides a kind of hydroexpanding body blocking agent profile controls to block removal of bridge formation method, with solution
The problem of certainly formation blockage causes subsequent note not intake when hydroexpanding body blocking agent profile control.
The present invention is achieved by the following technical solutions:
A kind of hydroexpanding body blocking agent profile control blocking removal of bridge formation method, comprising the following steps:
(1) it is blocked by plunger pump to hydroexpanding body blocking agent profile control and generally injects oxidation gel breaker in well, infused the broken glue of oxidation
After agent, the water of equivalent is reinjected, the oxidation gel breaker in pit shaft is all headed into stratum, closing well reacts 6 days, allows itself and stratum
In hydroexpanding body blocking agent reaction, organic principle therein of degrading.
The oxidation gel breaker, is disclosed by the prior art, is documented in a kind of patent of invention " injection well oxidation gel breaker
And preparation method thereof " in (patent No. 201310351923.7, Authorization Notice No. CN 103881673B), it may be assumed that oxidation gel breaker,
Be grouped as by the group of following weight percentage: persulfate oxidation agent 12~25%, alkaline pH adjusting agent 3.1~8.5% delay
Agent 0.5~2% is lost, mutual solvent 2~5%, surplus is water；The alkaline pH adjusting agent is by according to mass ratio are as follows: borax: carbonic acid
Sodium: sodium hydroxide=(0.1~0.5): (1~3): (2~5) composition.The persulfate oxidation agent is ammonium persulfate, persulfuric acid
One or both of potassium.The corrosion inhibiter is the anti-oxidation corrosion inhibiter of steel.The mutual solvent is ethyl alcohol.The preparation method comprises the following steps: In
Alkaline pH adjusting agent is added to being completely dissolved in stirring in water, then successively persulfate oxidation agent, mutual solvent and inhibition is added in stirring
Agent extremely dissolution is completely to obtain the final product.
The dosage of the oxidation gel breaker are as follows: every meter of 5~15m of core intersection3, injection rate is 5~15m3/h。
The injection rate of the water is 5~15m3/h。
(2) into hydroexpanding body blocking agent profile control blocking well, generally injection aoxidizes gel breaker again, after having infused oxidation gel breaker, then
The water for injecting equivalent, the oxidation gel breaker in pit shaft is all headed into stratum, and closing well reacts 5 days, allows itself and the water in stratum
The reaction of varicosity blocking agent, organic principle therein of thoroughly degrading.
The dosage of the oxidation gel breaker are as follows: every meter of 5~15m of core intersection3, injection rate is 5~15m3/h。
The injection rate of the water is 5~15m3/h。
(3) nitrogen (injecting by oil pipe) is injected into hydroexpanding body blocking agent profile control blocking well, injection rate are as follows: every rice bran oil thickness
Degree 0.5 × 104~1 × 104m3Nitrogen (under the status of criterion).
(4) hydrochloric acid that implantation quality score is 10~15% into hydroexpanding body blocking agent profile control blocking well (is infused by oil pipe
Enter), injection rate are as follows: every meter of 5~10m of core intersection3, injection rate is 5~15m3/h。
(5) mud acid, injection rate are injected into hydroexpanding body blocking agent profile control blocking well are as follows: every meter of 10~15m of core intersection3, note
Entering speed is 5~15m3/h；The water of equivalent is reinjected, injection rate is 5~15m3Mud acid in pit shaft is all headed into ground by/h
In layer, react 1 hour.
The mud acid (mixed acid of hydrofluoric acid and hydrochloric acid) is conventional products in the prior art, can conventional market purchase
It obtains.
(6) draining varicosity blocking agent profile control blocking well residual solution is returned.
Return the residual solution in discharge stratum.Tapping line uses hard tube line, and one end is connected with the oil pipe of well head, anchoring pipe
The tail portion of line and intermediate position.Residual solution is discharged into special glass reinforced plastic pond.Sleeve gate connects high pressure pressure windmill, another termination
700 type cementing trucks.Oil pipe gate is slowly opened, gas and residual solution self-spray in pit shaft is allowed to open when self-spray energy deficiency
700 type cementing trucks, with 10~30m3The discharge capacity of/h injects 40~60m3Water return row's residual solution, until inflow and outflow water quality one
Until cause.
(7) restore normally to fill the water into treated hydroexpanding body blocking agent profile control blocking well.
Hydroexpanding body blocking agent profile control of the invention blocks removal of bridge formation method, design principle are as follows: the complicated component of hydroexpanding body, no
Only contain organic matter (such as polymer), also (such as carbonate, calcium soil ingredient) containing organic/inorganic substance, therefore, when de-plugging needs to it
In organic matter degrade, so that it is become water-soluble small molecule and inorganic matter and carry out corrosion processing；It is poly- in hydroexpanding body
It is small to close object surface area, concentration is high, goes back the package of organic/inorganic substance, these factors influence reaction speed, when profile control tamper de-plugging, needs
Guarantee enough oxidation gel breaker amounts and enough degradation reaction time；After being acidified corrosion inorganic matter, by remaining residual solution
Discharge stratum is returned, eliminates residual solution to the adverse effect on stratum.Hydroexpanding body profile control blocking well is carried out using method of the invention
Processing, oxidation gel breaker can it is degradable fall near wellbore zone hydroexpanding body blocking agent in organic principle, hydrochloric acid and mud acid energy corrosion water
Inorganic constituents in varicosity blocking agent, nitrogen supplement stratum energy for promoting into the subsequent row of returning, and thoroughly eliminate hydroexpanding body blocking agent to stratum
Blocking.
Specific embodiment
Below with reference to embodiment, the present invention is further illustrated.
Instrument involved in following embodiments, reagent, material etc. are unless otherwise noted existing in the prior art
Conventional instrument, reagent, material etc., can be obtained by regular commercial sources.Experimental method involved in following embodiments, inspection
Survey method etc. is unless otherwise noted existing routine experiment method in the prior art, detection method etc..
A kind of hydroexpanding body blocking agent profile control of embodiment 1 blocks removal of bridge formation method, and steps are as follows:
(1) it is blocked by plunger pump to hydroexpanding body blocking agent profile control and generally injects oxidation gel breaker in well, infused the broken glue of oxidation
After agent, the water of equivalent is reinjected, the oxidation gel breaker in pit shaft is all headed into stratum, closing well reacts 6 days, allows itself and stratum
In hydroexpanding body blocking agent reaction, organic principle therein of degrading.
The oxidation gel breaker, is disclosed by the prior art, is documented in a kind of patent of invention " injection well oxidation gel breaker
And preparation method thereof " in (patent No. 201310351923.7, Authorization Notice No. CN 103881673B), the present invention is using in fact
Apply the formula of example 2, it may be assumed that oxidation gel breaker is grouped as: ammonium persulfate 20%, potassium peroxydisulfate by the group of following weight percentage
5%, borax 0.5%, sodium carbonate 3%, sodium hydroxide 5%, the anti-oxidation corrosion inhibiter of JHS-1 steel is (by China University Of Petroleum Beijing's petroleum
Chemical engineering institute provides) 2%, ethyl alcohol 5%, surplus is water.Preparation step is as follows: borax, sodium carbonate and hydrogen is added in stirring in water
Sodium oxide molybdena to being completely dissolved, then successively stirring be added ammonium persulfate, potassium peroxydisulfate, ethyl alcohol and corrosion inhibiter to dissolution perfect solution at
Homogeneous transparent shape to obtain the final product.
The dosage of the oxidation gel breaker are as follows: every meter of core intersection 10m3, injection rate 10m3/h。
The injection rate of the water is 10m3/h。
(2) into hydroexpanding body blocking agent profile control blocking well, generally injection aoxidizes gel breaker again, after having infused oxidation gel breaker, then
The water for injecting equivalent, the oxidation gel breaker in pit shaft is all headed into stratum, and closing well reacts 5 days, allows itself and the water in stratum
The reaction of varicosity blocking agent, organic principle therein of thoroughly degrading.
The dosage of the oxidation gel breaker are as follows: every meter of core intersection 10m3, injection rate 10m3/h。
The injection rate of the water is 10m3/h。
(3) nitrogen (injecting by oil pipe) is injected into hydroexpanding body blocking agent profile control blocking well, injection rate are as follows: every rice bran oil thickness
Degree 0.8 × 104m3Nitrogen (under the status of criterion).
(4) hydrochloric acid (being injected by oil pipe) that implantation quality score is 13% into hydroexpanding body blocking agent profile control blocking well, note
Enter amount are as follows: every meter of core intersection 8m3, injection rate 10m3/h。
(5) mud acid, injection rate are injected into hydroexpanding body blocking agent profile control blocking well are as follows: every meter of core intersection 13m3, injection speed
Degree is 10m3/h；Reinject the water of equivalent, injection rate 10m3/ h all heads into the mud acid in pit shaft in stratum, reaction 1
Hour.
(6) draining varicosity blocking agent profile control blocking well residual solution is returned.
Return the residual solution in discharge stratum.Tapping line uses hard tube line, and one end is connected with the oil pipe of well head, anchoring pipe
The tail portion of line and intermediate position.Residual solution is discharged into special glass reinforced plastic pond.Sleeve gate connects high pressure pressure windmill, another termination
700 type cementing trucks.Oil pipe gate is slowly opened, gas and residual solution self-spray in pit shaft is allowed to open when self-spray energy deficiency
700 type cementing trucks, with 20m3The discharge capacity of/h injects 40~60m3Water return row's residual solution, until inflow and outflow water quality is unanimously
Only.
(7) restore normally to fill the water into treated hydroexpanding body blocking agent profile control blocking well.
A kind of hydroexpanding body blocking agent profile control of embodiment 2 blocks removal of bridge formation method, and steps are as follows:
(1) it is blocked by plunger pump to hydroexpanding body blocking agent profile control and generally injects oxidation gel breaker in well, infused the broken glue of oxidation
After agent, the water of equivalent is reinjected, the oxidation gel breaker in pit shaft is all headed into stratum, closing well reacts 6 days, allows itself and stratum
In hydroexpanding body blocking agent reaction, organic principle therein of degrading.
The oxidation gel breaker, is disclosed by the prior art, is documented in a kind of patent of invention " injection well oxidation gel breaker
And preparation method thereof " in (patent No. 201310351923.7, Authorization Notice No. CN 103881673B), the present invention is using in fact
Apply the formula of example 2.
The dosage of the oxidation gel breaker are as follows: every meter of core intersection 5m3, injection rate 5m3/h。
The injection rate of the water is 5m3/h。
(2) into hydroexpanding body blocking agent profile control blocking well, generally injection aoxidizes gel breaker again, after having infused oxidation gel breaker, then
The water for injecting equivalent, the oxidation gel breaker in pit shaft is all headed into stratum, and closing well reacts 5 days, allows itself and the water in stratum
The reaction of varicosity blocking agent, organic principle therein of thoroughly degrading.
The dosage of the oxidation gel breaker are as follows: every meter of core intersection 5m3, injection rate 5m3/h。
The injection rate of the water is 5m3/h。
(3) nitrogen (injecting by oil pipe) is injected into hydroexpanding body blocking agent profile control blocking well, injection rate are as follows: every rice bran oil thickness
Degree 0.5 × 104m3Nitrogen (under the status of criterion).
(4) hydrochloric acid (being injected by oil pipe) that implantation quality score is 10% into hydroexpanding body blocking agent profile control blocking well, note
Enter amount are as follows: every meter of core intersection 10m3, injection rate 15m3/h。
(5) mud acid, injection rate are injected into hydroexpanding body blocking agent profile control blocking well are as follows: every meter of core intersection 10m3, injection speed
Degree is 5m3/h；Reinject the water of equivalent, injection rate 5m3/ h all heads into the mud acid in pit shaft in stratum, and reaction 1 is small
When.
(6) draining varicosity blocking agent profile control blocking well residual solution is returned.
Return the residual solution in discharge stratum.Tapping line uses hard tube line, and one end is connected with the oil pipe of well head, anchoring pipe
The tail portion of line and intermediate position.Residual solution is discharged into special glass reinforced plastic pond.Sleeve gate connects high pressure pressure windmill, another termination
700 type cementing trucks.Oil pipe gate is slowly opened, gas and residual solution self-spray in pit shaft is allowed to open when self-spray energy deficiency
700 type cementing trucks, with 10m3The discharge capacity of/h injects 40~60m3Water return row's residual solution, until inflow and outflow water quality is unanimously
Only.
(7) restore normally to fill the water into treated hydroexpanding body blocking agent profile control blocking well.
A kind of hydroexpanding body blocking agent profile control of embodiment 3 blocks removal of bridge formation method, and steps are as follows:
(1) it is blocked by plunger pump to hydroexpanding body blocking agent profile control and generally injects oxidation gel breaker in well, infused the broken glue of oxidation
After agent, the water of equivalent is reinjected, the oxidation gel breaker in pit shaft is all headed into stratum, closing well reacts 6 days, allows itself and stratum
In hydroexpanding body blocking agent reaction, organic principle therein of degrading.
The oxidation gel breaker, is disclosed by the prior art, is documented in a kind of patent of invention " injection well oxidation gel breaker
And preparation method thereof " in (patent No. 201310351923.7, Authorization Notice No. CN 103881673B), the present invention is using in fact
Apply the formula of example 2.
The dosage of the oxidation gel breaker are as follows: every meter of core intersection 15m3, injection rate 15m3/h。
The injection rate of the water is 15m3/h。
(2) into hydroexpanding body blocking agent profile control blocking well, generally injection aoxidizes gel breaker again, after having infused oxidation gel breaker, then
The water for injecting equivalent, the oxidation gel breaker in pit shaft is all headed into stratum, and closing well reacts 5 days, allows itself and the water in stratum
The reaction of varicosity blocking agent, organic principle therein of thoroughly degrading.
The dosage of the oxidation gel breaker are as follows: every meter of core intersection 15m3, injection rate 15m3/h。
The injection rate of the water is 15m3/h。
(3) nitrogen (injecting by oil pipe) is injected into hydroexpanding body blocking agent profile control blocking well, injection rate are as follows: every rice bran oil thickness
Degree 1.0 × 104m3Nitrogen (under the status of criterion).
(4) hydrochloric acid (being injected by oil pipe) that implantation quality score is 15% into hydroexpanding body blocking agent profile control blocking well, note
Enter amount are as follows: every meter of core intersection 5m3, injection rate 5m3/h。
(5) mud acid, injection rate are injected into hydroexpanding body blocking agent profile control blocking well are as follows: every meter of core intersection 15m3, injection speed
Degree is 15m3/h；Reinject the water of equivalent, injection rate 15m3/ h all heads into the mud acid in pit shaft in stratum, reaction 1
Hour.
(6) draining varicosity blocking agent profile control blocking well residual solution is returned.
Return the residual solution in discharge stratum.Tapping line uses hard tube line, and one end is connected with the oil pipe of well head, anchoring pipe
The tail portion of line and intermediate position.Residual solution is discharged into special glass reinforced plastic pond.Sleeve gate connects high pressure pressure windmill, another termination
700 type cementing trucks.Oil pipe gate is slowly opened, gas and residual solution self-spray in pit shaft is allowed to open when self-spray energy deficiency
700 type cementing trucks, with 30m3The discharge capacity of/h injects 40~60m3Water return row's residual solution, until inflow and outflow water quality is unanimously
Only.
(7) restore normally to fill the water into treated hydroexpanding body blocking agent profile control blocking well.
Above-mentioned, although specific embodiments of the present invention have been described in conjunction with the embodiments, not protects to the present invention
The limitation of range, those skilled in the art should understand that, based on the technical solutions of the present invention, those skilled in the art
The various modifications or changes that can be made are not needed to make the creative labor still within protection scope of the present invention.
Claims (3)
1. a kind of hydroexpanding body blocking agent profile control blocks removal of bridge formation method, it is characterised in that: the following steps are included:
(1) it is blocked by plunger pump to hydroexpanding body blocking agent profile control and generally injects oxidation gel breaker in well, after having infused oxidation gel breaker,
The water for reinjecting equivalent all heads into the oxidation gel breaker in pit shaft in stratum, and closing well reacts 6 days；
The dosage of the oxidation gel breaker are as follows: aoxidized based on 5~15 cubic metres of gel breaker by 1 meter of injection of core intersection, injection rate
It is 5~15 cubic metres per hour；
The injection rate of the water is 5~15 cubic metres per hour；
(2) into hydroexpanding body blocking agent profile control blocking well, generally injection oxidation gel breaker reinjects after having infused oxidation gel breaker again
The water of equivalent all heads into the oxidation gel breaker in pit shaft in stratum, and closing well reacts 5 days；
The dosage of the oxidation gel breaker are as follows: aoxidized based on 5~15 cubic metres of gel breaker by 1 meter of injection of core intersection, injection rate
It is 5~15 cubic metres per hour；
The injection rate of the water is 5~15 cubic metres per hour；
(3) nitrogen, injection rate are injected into hydroexpanding body blocking agent profile control blocking well are as follows: press 1 meter of injection nitrogen 0.5 × 10 of core intersection4
~1 × 104Cubic meter meter；
(4) hydrochloric acid that implantation quality score is 10~15% into hydroexpanding body blocking agent profile control blocking well, injection rate are as follows: thick by oil reservoir
5~10 cubic metres of hydrochloric acid of 1 meter of injection meters are spent, injection rate is 5~15 cubic metres per hour；
(5) mud acid, injection rate are injected into hydroexpanding body blocking agent profile control blocking well are as follows: press 1 meter of injection mud acid 10~15 of core intersection
Cubic meter meter, injection rate are 5~15 cubic metres per hour；The water of mud acid equivalent is reinjected, injection rate is per hour 5~15
Cubic meter, the mud acid in pit shaft is all headed into stratum, is reacted 1 hour；
(6) draining varicosity blocking agent profile control blocking well residual solution is returned；
(7) restore normally to fill the water into treated hydroexpanding body blocking agent profile control blocking well.
2. hydroexpanding body blocking agent profile control according to claim 1 blocks removal of bridge formation method, it is characterised in that: the step
(6) in, tapping line used by the row of returning is hard tube line, and one end is connected with the oil pipe of well head, be anchored pipeline tail portion and in
Between position；Sleeve gate connects high pressure pressure windmill；When the row of returning, oil pipe gate is opened, allows gas and residual solution self-spray in pit shaft, when
When self-spray energy deficiency, row's residual solution is returned with the water that 10~30 cubic metres per hour of discharge capacity injects 40~60 cubic metres, until
Until inflow and outflow water quality is consistent.
3. hydroexpanding body blocking agent profile control according to claim 1 or 2 blocks removal of bridge formation method, it is characterised in that: specific step
It is rapid as follows:
(1) it is blocked by plunger pump to hydroexpanding body blocking agent profile control and generally injects oxidation gel breaker in well, after having infused oxidation gel breaker,
The water for reinjecting equivalent all heads into the oxidation gel breaker in pit shaft in stratum, and closing well reacts 6 days；
The dosage of the oxidation gel breaker are as follows: aoxidized based on 10 cubic metres of gel breaker by 1 meter of injection of core intersection, injection rate is every
10 cubic metres of hour；
The injection rate of the water is 10 cubic metres per hour；
(2) into hydroexpanding body blocking agent profile control blocking well, generally injection oxidation gel breaker reinjects after having infused oxidation gel breaker again
The water of equivalent all heads into the oxidation gel breaker in pit shaft in stratum, and closing well reacts 5 days；
The dosage of the oxidation gel breaker are as follows: aoxidized based on 10 cubic metres of gel breaker by 1 meter of injection of core intersection, injection rate is every
10 cubic metres of hour；
The injection rate of the water is 10 cubic metres per hour；
(3) nitrogen, injection rate are injected into hydroexpanding body blocking agent profile control blocking well are as follows: press 1 meter of injection nitrogen 0.8 × 10 of core intersection4
Cubic meter meter；
(4) hydrochloric acid that implantation quality score is 13% into hydroexpanding body blocking agent profile control blocking well, injection rate are as follows: press core intersection 1
8 cubic metres of hydrochloric acid meters of rice injection, injection rate are 10 cubic metres per hour；
(5) mud acid, injection rate are injected into hydroexpanding body blocking agent profile control blocking well are as follows: press 1 meter of core intersection, 13 cubes of mud acid of injection
Rice meter, injection rate are 10 cubic metres per hour；The water of mud acid equivalent is reinjected, injection rate is 10 cubic metres per hour, will
Mud acid in pit shaft all heads into stratum, reacts 1 hour；
(6) draining varicosity blocking agent profile control blocking well residual solution is returned；
(7) restore normally to fill the water into treated hydroexpanding body blocking agent profile control blocking well.
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| CN201610942445.0A CN108019192B (en) | 2016-11-01 | 2016-11-01 | A kind of hydroexpanding body blocking agent profile control blocking removal of bridge formation method |
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| US7287586B2 (en) * | 2005-02-01 | 2007-10-30 | Halliburton Energy Services, Inc. | Compositions and methods for plugging and sealing a subterranean formation |
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| CN104100224A (en) * | 2013-04-03 | 2014-10-15 | 中国石油天然气股份有限公司 | Oil well water plugging method |
| CN103881674A (en) * | 2013-10-18 | 2014-06-25 | 中国石油化工股份有限公司 | Combined blocking remover for polymer injection blocking well section plug and preparation method and application of combined blocking remover |
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