CN104650837A - Blocking remover for removing blockage in polymer flooding well region and its preparation method and use - Google Patents
Blocking remover for removing blockage in polymer flooding well region and its preparation method and use Download PDFInfo
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- CN104650837A CN104650837A CN201310575155.3A CN201310575155A CN104650837A CN 104650837 A CN104650837 A CN 104650837A CN 201310575155 A CN201310575155 A CN 201310575155A CN 104650837 A CN104650837 A CN 104650837A
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Abstract
The invention discloses a blocking remover for removing blockage in a polymer flooding well region. The blocking remover comprises 1.0-10.0% of ferrous chloride (FeCl2.4H2O), 0.2-2.0% of polyferric sulfate, 0.1-1.0% of aminosulfonic acid, 0.5-2.0% of an acid inhibitor, 0.5-2.0% of potassium chloride and the balance water. The preparation method comprises the following steps of adding clear water into a reactor, carrying out pre-heating to a temperature of 65-70 DEG C, keeping the temperature for 15min, orderly adding the acid inhibitor, aminosulfonic acid, potassium chloride and polyferric sulfate into the reactor, carrying out stirring reaction for 1-1.5h, and carrying out cooling to a room temperature for next use. Various polymer gel products prepared from common polyacrylamide are added with an optimal amount of the blocking remover at a temperature of 20-70 DEG C and the mixture undergoes a reaction for 4h so that a gel degradation rate is 90% or more and solution viscosity after degradation is less than 5MPa.s.
Description
Technical field
The present invention relates to oil extraction in oil field technical field, particularly a kind of chemical agent being specifically designed to process polymer flooding and causing immediate vicinity of wellbore to block.
Background technology
Current polyacrylamide gel transfer drive technology has become each oil field and has improved one of dominant technology of waterflooding development effect, but through application for many years, the effect of transfer drive progressively declines, major cause is that polyacrylamide gel is constantly migrated and mixes with stratum clay material, blocking stratum filtration passage damages, and particularly the immediate vicinity of wellbore of oil well is often blocked causes production declining.
Along with polymer in injection wells problem becomes increasingly conspicuous, domestic and international oil field is considered by adopting the method for strong oxidizer oxidative degradation polymkeric substance to solve, as the chemical agent such as hydrogen peroxide, Chlorine Dioxide Oxidation.But when actual application, hydrogen peroxide is very easily blasted and is caused security incident in transportation and construction process; Also there is the danger of blast in the gas effusion generated in chlorine dioxide method construction, very easily damages simultaneously, and have corrosion to equipment installation to workmen's eyes, skin.
Summary of the invention
The object of the invention is: a kind of unblocking agent removing the blocking of polymer flooding immediate vicinity of wellbore is provided, reducing substances fast degradation polyacrylamide gel molecular is used under the condition of limited oxygen, remove polymer plugging, do not produce obnoxious flavour in use procedure, site operation is safe and simple.
The technical scheme that the present invention takes for its technical problem of solution is:
This unblocking agent is filled a prescription, and each weight percentages of components is:
Host: iron protochloride (FeCl
24H
2o), consumption 1.0% ~ 10.0%;
Stablizer: bodied ferric sulfate, consumption 0.2 ~ 2.0%;
Stablizer: thionamic acid, consumption 0.1 ~ 1.0%;
Inhibiter: acid inhibitor, consumption 0.5 ~ 2.0%;
Auxiliary agent: Repone K, consumption 0.5 ~ 2.0%;
Surplus is water.
Preparation method:
In reactor, add clear water, be preheated to 65 ~ 70 DEG C, constant temperature 15 minutes, adds acid inhibitor, thionamic acid, iron protochloride, bodied ferric sulfate, Repone K successively, and stirring reaction 1 ~ 1.5 hour, is cooled to room temperature for subsequent use.
Using method:
On-the-spot employing movable type is joined, note unit connects surface pipeline to Christmas tree casing mouth, injects continuously.
Construction procedure:
(1) flow process is changed into well-flushing flow process, slowly open sleeve gate, inject 3 ~ 10 side's water flushings, close the valve that enters the station.
(2) movable type is joined, note unit 1 overlap connect surface pipeline to Christmas tree casing mouth, pipeline and more than testing pressure of well head 25MPa, do not sting and do not leak for qualified.
(3) injected clear water asks water injectivity index, operational discharge capacity 3 ~ 10m
3/ h, well head squeeze pressure should lower than formation-parting pressure.
(4) inject cracking agent, operational discharge capacity is determined according to water injectivity index.
(5) to construct complete can driving a well.
Working conditions:
Use temperature: 20 DEG C ~ 70 DEG C, the complete reaction time: 4 hours.
The effect of invention.
Beneficial effect of the present invention: the present invention starts with from the degradation method of research transfer drive host polyacrylamide, in oilfield injection water with limited oxygen, makes the C-C chain chain-scission degradation of polyacrylamide by adding the material with reductibility.By formula indoor screening experiment and compatibleness experiment, optimal proportion experiment is carried out to the auxiliary agent such as stablizer, inhibiter, obtain stable ripe unblocking agent basic recipe, propose the de-plugging arrangement and method for construction that a kind of on-site construction operations is simple, safe, realize the problem removing immediate vicinity of wellbore polymer gel blocking.
Laboratory experiment result verification, adopt all kinds of polymer gels of conventional polyacrylamide preparation, under 20 DEG C ~ 70 DEG C scopes, add the optimum amount of unblocking agent, react and gel degradation rate within 4 hours, can be made to reach more than 90%, after degraded, soltion viscosity is lower than 5MPas.
Embodiment
In the present embodiment, the raw material adopted is technical grade, adds than being all weight percentage.
Embodiment 1
This unblocking agent is filled a prescription, and each weight percentages of components is:
Host: iron protochloride (FeCl
24H
2o), consumption 5.0%;
Stablizer: bodied ferric sulfate, consumption 1.0%;
Stablizer: thionamic acid, consumption 0.5%;
Inhibiter: acid inhibitor, consumption 1.0%;
Auxiliary agent: Repone K, consumption 0.5%;
Surplus is water.
Preparation method:
920kg clear water is added in reactor, be preheated to 70 ~ 75 DEG C, constant temperature 15 minutes, add acid inhibitor 10kg, thionamic acid 5kg, iron protochloride 50kg, bodied ferric sulfate 10kg, Repone K 5kg successively, stirring reaction 1 ~ 1.5 hour, is cooled to room temperature for subsequent use.
Field conduct method:
On-the-spot employing movable type is joined, note unit connects surface pipeline to Christmas tree casing mouth, injects continuously.
Construction procedure:
(1) flow process is changed into well-flushing flow process, slowly open sleeve gate, inject 3 ~ 10 side's water flushings, close the valve that enters the station.
(2) movable type is joined, note unit 1 overlap connect surface pipeline to Christmas tree casing mouth, pipeline and more than testing pressure of well head 25MPa, do not sting and do not leak for qualified.
(3) injected clear water asks water injectivity index, operational discharge capacity 3 ~ 10m
3/ h, well head squeeze pressure should lower than formation-parting pressure.
(4) inject note blocking agent, operational discharge capacity is determined according to water injectivity index.
(5) to construct complete can driving a well.
Working conditions:
Use temperature: 20 DEG C ~ 70 DEG C, the complete reaction time: 4 hours.
The formula of 1st ~ 18 embodiments adopts list mode to represent, is listed as follows:
The unblocking agent formula of polymer plugging removed by table 1
In view of factors such as the special oil reservoir of difference, temperature and water quality, when selecting unblocking agent of the present invention, need to test targetedly, to adjust to best effect.
Recommendation formula is embodiment 5 or adjusts targetedly on the basis of embodiment 10.
Claims (3)
1. remove a unblocking agent for polymer flooding immediate vicinity of wellbore blocking, it is characterized in that: this unblocking agent is filled a prescription, and each compositions in weight percentage is:
2. the preparation method of the unblocking agent of a releasing polymer flooding immediate vicinity of wellbore according to claim 1 blocking, it is characterized in that: in reactor, add clear water, be preheated to 65 ~ 70 DEG C, constant temperature 15 minutes, add acid inhibitor, thionamic acid, iron protochloride, bodied ferric sulfate, Repone K successively, stirring reaction 1 ~ 1.5 hour, is cooled to room temperature for subsequent use.
3. an application for the unblocking agent of releasing polymer flooding immediate vicinity of wellbore according to claim 1 blocking, is characterized in that:
(1) flow process is changed into well-flushing flow process, slowly open sleeve gate, inject 3 ~ 10 side's water flushings, close the valve that enters the station;
(2) movable type is joined, note unit 1 overlap connect surface pipeline to Christmas tree casing mouth, pipeline and testing pressure of well head 25MPa, do not sting and do not leak for qualified;
(3) injected clear water asks water injectivity index, operational discharge capacity 3 ~ 10m
3/ h, well head squeeze pressure should lower than formation-parting pressure;
(4) inject unblocking agent, operational discharge capacity is determined according to water injectivity index;
(5) to construct complete can driving a well.
Use temperature: 20 DEG C ~ 70 DEG C, the complete reaction time: 4 hours.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310575155.3A CN104650837B (en) | 2013-11-15 | 2013-11-15 | It is a kind of to release the de-plugging agent and its preparation and application that polymer flooding near wellbore zone blocks |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310575155.3A CN104650837B (en) | 2013-11-15 | 2013-11-15 | It is a kind of to release the de-plugging agent and its preparation and application that polymer flooding near wellbore zone blocks |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN104650837A true CN104650837A (en) | 2015-05-27 |
| CN104650837B CN104650837B (en) | 2018-07-13 |
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| CN201310575155.3A Active CN104650837B (en) | 2013-11-15 | 2013-11-15 | It is a kind of to release the de-plugging agent and its preparation and application that polymer flooding near wellbore zone blocks |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105298458A (en) * | 2015-11-28 | 2016-02-03 | 东北石油大学 | Method for relieving downward lag of polymer flooding production well sucker rod |
| 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 |
| CN113403055A (en) * | 2021-08-18 | 2021-09-17 | 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 | Low-temperature demulsifier for dehydration of produced liquid by polymer flooding 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 |
-
2013
- 2013-11-15 CN CN201310575155.3A patent/CN104650837B/en active Active
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 | Low-temperature demulsifier for dehydration of produced liquid by polymer flooding 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 |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105298458A (en) * | 2015-11-28 | 2016-02-03 | 东北石油大学 | Method for relieving downward lag of polymer flooding production well sucker rod |
| 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 |
| CN113403055A (en) * | 2021-08-18 | 2021-09-17 | 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 |
| 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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| Publication number | Publication date |
|---|---|
| CN104650837B (en) | 2018-07-13 |
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