CN104650837B - Blocking remover for removing blockage of polymer flooding near wellbore zone and preparation and application thereof - Google Patents
Blocking remover for removing blockage of polymer flooding near wellbore zone and preparation and application thereof Download PDFInfo
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- CN104650837B CN104650837B CN201310575155.3A CN201310575155A CN104650837B CN 104650837 B CN104650837 B CN 104650837B CN 201310575155 A CN201310575155 A CN 201310575155A CN 104650837 B CN104650837 B CN 104650837B
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- plugging agent
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Abstract
The invention relates to a blocking remover for removing blockage of a polymer flooding near wellbore zone; ferrous chloride (FeCl)2·4H2O), 1.0-10.0%; 0.2-2.0% of polymeric ferric sulfate; 0.1-1.0% of sulfamic acid; 0.5-2.0% of acid corrosion inhibitor; 0.5-2.0% of potassium chloride; adding clear water into the reaction kettle, preheating to 65-70 ℃, keeping the temperature for 15 minutes, sequentially adding an acid corrosion inhibitor, sulfamic acid, ferrous chloride and polymeric ferric sulfate, stirring for reaction for 1-1.5 hours, and cooling to room temperature for later use; various polymer gels prepared from common polyacrylamide are adopted, the optimal dosage of the blocking remover is added at the temperature of 20-70 ℃, the gel degradation rate can reach more than 90 percent after reaction for 4 hours, and the viscosity of the degraded solution is lower than 5 MPa.s.
Description
Technical field
The present invention relates to oil extraction in oil field technical field, more particularly to it is a kind of dedicated for processing polymer flooding with causing nearly well
With the chemical agent blocked.
Background technology
Polyacrylamide gel transfer drive technology has become one of the dominant technology that waterflooding development effect is improved in each oil field at present,
However pass through application for many years, the application effect of transfer drive gradually declines, and main cause is that polyacrylamide gel is constantly migrated simultaneously
It is mixed with stratum clay material, blocks stratum filtration channel and damage, especially the near wellbore zone of oil well is often blocked and makes
Decline at yield.
As polymer in injection wells problem becomes increasingly conspicuous, domestic and international oil field considers to polymerize by using strong oxidizer oxidative degradation
The method of object solves, such as hydrogen peroxide, Chlorine Dioxide Oxidation chemical agent.However in actual application, hydrogen peroxide is being transported
Explosion easily occurs in defeated process and work progress and causes safety accident；The gas effusion generated in chlorine dioxide method construction
There are the danger of explosion, while easily being damaged to construction personnel's eyes, skin, and have corrosion to equipment installation.
Invention content
The purpose of the present invention is：A kind of de-plugging agent that releasing polymer flooding near wellbore zone blocks is provided, in the item of limited oxygen
Reducing substances fast degradation polyacrylamide gel molecular is used under part, is released polymer plugging, is not produced during use
Raw pernicious gas, site operation are safe and simple.
By solution, its technical problem adopts the technical scheme that the present invention：
The de-plugging agent prescription, each component weight percent are：
Host agent：Frerrous chloride（FeCl2·4H2O）, dosage 1.0%~10.0%；
Stabilizer：Bodied ferric sulfate, dosage 0.2~2.0%；
Stabilizer：Sulfamic acid, dosage 0.1~1.0%；
Corrosion inhibiter：Acid inhibitor, dosage 0.5~2.0%；
Auxiliary agent：Potassium chloride, dosage 0.5~2.0%；
Surplus is water.
Preparation method：
Clear water is added into reaction kettle, is preheated to 65~70 DEG C, constant temperature 15 minutes sequentially adds acid inhibitor, amino sulphur
Acid, frerrous chloride, bodied ferric sulfate, potassium chloride are stirred to react 1~1.5 hour, are cooled to room temperature spare.
Application method：
Scene is matched using movable type, notes unit connection surface line to Christmas tree casing mouth, is continuously injected into.
Construction procedure：
（1）Flow is changed into well-flushing flow, slowly opens sleeve gate, injects 3~10 side's water flushings, closes the valve that enters the station
Door.
（2）Movable type is matched, notes 1 set of connection surface line of unit to Christmas tree casing mouth, pipeline and testing pressure of well head 25MPa
More than, it does not pierce and does not leak for qualification.
（3）Injected clear water asks injectivity index, 3~10m of operational discharge capacity3/ h, well head squeeze pressure should be less than formation fracture pressure
Power.
（4）Decomposition agent is injected, operational discharge capacity is determined according to injectivity index.
（5）Construction is finished and can be driven a well.
Use condition：
Temperature in use：20 DEG C~70 DEG C, the complete reaction time：4 hours.
The effect of invention.
Beneficial effects of the present invention：The present invention starts with from the biodegrading process of research transfer drive host agent polyacrylamide, in oil
Field is injected in water in the case of limited oxygen, and the C-C chain chain ruptures of polyacrylamide are made by substance of the addition with reproducibility
Degradation.It is tested by formula indoor screening experiment and compatibility, optimal proportion experiment is carried out to auxiliary agents such as stabilizer, corrosion inhibiter,
The de-plugging agent basic recipe for obtaining stablizing maturation proposes a kind of de-plugging arrangement and method for construction that on-site construction operations are simple, safe, realizes
Release the problem of near wellbore zone polymer gel blocks.
Laboratory experiment result verification, all kinds of polymer gels prepared using common polyacrylamide, 20 DEG C~70 DEG C models
Under enclosing, the optimum amount of de-plugging agent is added, reaction can make gel degradation rate reach 90% or more in 4 hours, solution viscosity after degradation
Less than 5MPas.
Specific implementation mode
In the present embodiment, used raw material is technical grade, and ratio is added and is weight percentage.
Embodiment 1
The de-plugging agent prescription, each component weight percent are：
Host agent：Frerrous chloride（FeCl2·4H2O）, dosage 5.0%；
Stabilizer：Bodied ferric sulfate, dosage 1.0%；
Stabilizer：Sulfamic acid, dosage 0.5%；
Corrosion inhibiter：Acid inhibitor, dosage 1.0%；
Auxiliary agent：Potassium chloride, dosage 0.5%；
Surplus is water.
Preparation method：
920kg clear water is added into reaction kettle, is preheated to 70~75 DEG C, constant temperature 15 minutes sequentially adds acid inhibitor
10kg, sulfamic acid 5kg, frerrous chloride 50kg, bodied ferric sulfate 10kg, potassium chloride 5kg are stirred to react 1~1.5 hour, cold
But spare to room temperature.
Field conduct method：
Scene is matched using movable type, notes unit connection surface line to Christmas tree casing mouth, is continuously injected into.
Construction procedure：
（1）Flow is changed into well-flushing flow, slowly opens sleeve gate, injects 3~10 side's water flushings, closes the valve that enters the station
Door.
（2）Movable type is matched, notes 1 set of connection surface line of unit to Christmas tree casing mouth, pipeline and testing pressure of well head 25MPa
More than, it does not pierce and does not leak for qualification.
（3）Injected clear water asks injectivity index, 3~10m of operational discharge capacity3/ h, well head squeeze pressure should be less than formation fracture pressure
Power.
（4）Blocking agent is explained in injection, and operational discharge capacity is determined according to injectivity index.
（5）Construction is finished and can be driven a well.
Use condition：
Temperature in use：20 DEG C~70 DEG C, the complete reaction time：4 hours.
The formula of 1st~18 embodiment is indicated using list mode, is listed as follows：
Table 1 releases the de-plugging agent prescription of polymer plugging
When selecting de-plugging agent of the present invention be directed in view of factors such as different special oil reservoirs, temperature and water quality
The experiment of property, to be adjusted to optimum efficiency.
Formula is recommended to be embodiment 5 or targetedly adjusted on the basis of embodiment 10.
Claims (3)
1. a kind of de-plugging agent for releasing polymer flooding near wellbore zone and blocking, it is characterised in that：The de-plugging agent prescription, each component is by weight
Measuring percentage is：
2. a kind of preparation method described in claim 1 releasing the de-plugging agent that polymer flooding near wellbore zone blocks, feature exist
In：Clear water is added into reaction kettle, is preheated to 65~70 DEG C, constant temperature 15 minutes sequentially adds acid inhibitor, sulfamic acid, chlorine
Change ferrous iron, bodied ferric sulfate, potassium chloride, is stirred to react 1~1.5 hour, is cooled to room temperature spare.
3. a kind of application described in claim 1 releasing the de-plugging agent that polymer flooding near wellbore zone blocks, it is characterised in that：
(1) flow is changed into well-flushing flow, slowly opens sleeve gate, inject 3~10 side's water flushings, close the valve that enters the station；
(2) movable type matched, note 1 set of connection surface line of unit to Christmas tree casing mouth, pipeline and testing pressure of well head 25MPa, no
Thorn does not leak for qualification；
(3) injected clear water asks injectivity index, 3~10m3/h of operational discharge capacity, well head squeeze pressure that should be less than formation fracture pressure；
(4) de-plugging agent is injected, operational discharge capacity is determined according to injectivity index；
(5) construction is finished and can be driven a well；
Temperature in use：20 DEG C~70 DEG C, the complete reaction time：4 hours.
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| CN201310575155.3A CN104650837B (en) | 2013-11-15 | 2013-11-15 | Blocking remover for removing blockage of polymer flooding near wellbore zone and preparation and application thereof |
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| CN201310575155.3A CN104650837B (en) | 2013-11-15 | 2013-11-15 | Blocking remover for removing blockage of polymer flooding near wellbore zone and preparation and application thereof |
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| CN104650837A CN104650837A (en) | 2015-05-27 |
| CN104650837B true CN104650837B (en) | 2018-07-13 |
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Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105298458B (en) * | 2015-11-28 | 2018-08-14 | 东北石油大学 | A kind of method that poly- drive produced well sucker rod downlink lag releases |
| CN109485163A (en) * | 2018-12-29 | 2019-03-19 | 河北峻极化工科技有限公司 | For releasing the polymer grease dispersing agent and preparation method of ground flow sludge |
| CN112746829A (en) * | 2019-10-30 | 2021-05-04 | 中国石油化工股份有限公司 | Water-plugging viscosity-reducing exploitation method for thick oil in high water-cut period |
| CN113403055B (en) * | 2021-08-18 | 2021-11-09 | 北京石大瑞伽石油技术开发有限公司 | Water-soluble polymer degradation agent and preparation and application thereof |
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| CN101078343A (en) * | 2007-07-06 | 2007-11-28 | 郝东 | Fracturing technique for relieving fracturing fluid pollution |
| CN101580736A (en) * | 2009-05-27 | 2009-11-18 | 中国石油天然气股份有限公司 | Polymer flooding crude oil produced liquid dehydration low-temperature demulsifier and preparation method thereof |
| CN101691839A (en) * | 2009-09-30 | 2010-04-07 | 陕西中孚石油技术有限责任公司 | Ultra-low resistance acid-type microemulsion plugging removal and stimulation technology for low permeability oil well |
| CN103159346A (en) * | 2013-03-27 | 2013-06-19 | 北京矿冶研究总院 | Pretreatment method and equipment for oilfield fracturing flowback fluid |
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Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101078343A (en) * | 2007-07-06 | 2007-11-28 | 郝东 | Fracturing technique for relieving fracturing fluid pollution |
| CN101580736A (en) * | 2009-05-27 | 2009-11-18 | 中国石油天然气股份有限公司 | Polymer flooding crude oil produced liquid dehydration low-temperature demulsifier and preparation method thereof |
| CN101691839A (en) * | 2009-09-30 | 2010-04-07 | 陕西中孚石油技术有限责任公司 | Ultra-low resistance acid-type microemulsion plugging removal and stimulation technology for low permeability oil well |
| CN103159346A (en) * | 2013-03-27 | 2013-06-19 | 北京矿冶研究总院 | Pretreatment method and equipment for oilfield fracturing flowback fluid |
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