CN104650837A - 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
- Publication number
- 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
- Authority
- CN
- China
- Prior art keywords
- polymer flooding
- blocking
- unblocking agent
- water
- temperature
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Links
- 229920000642 polymer Polymers 0.000 title claims abstract description 14
- 230000000903 blocking effect Effects 0.000 title claims abstract description 10
- 238000002360 preparation method Methods 0.000 title claims description 5
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 20
- 239000002253 acid Substances 0.000 claims abstract description 12
- WCUXLLCKKVVCTQ-UHFFFAOYSA-M Potassium chloride Chemical compound [Cl-].[K+] WCUXLLCKKVVCTQ-UHFFFAOYSA-M 0.000 claims abstract description 7
- 239000003112 inhibitor Substances 0.000 claims abstract description 7
- NMCUIPGRVMDVDB-UHFFFAOYSA-L iron dichloride Chemical compound Cl[Fe]Cl NMCUIPGRVMDVDB-UHFFFAOYSA-L 0.000 claims abstract description 7
- RUTXIHLAWFEWGM-UHFFFAOYSA-H iron(3+) sulfate Chemical compound [Fe+3].[Fe+3].[O-]S([O-])(=O)=O.[O-]S([O-])(=O)=O.[O-]S([O-])(=O)=O RUTXIHLAWFEWGM-UHFFFAOYSA-H 0.000 claims abstract description 7
- 229910000360 iron(III) sulfate Inorganic materials 0.000 claims abstract description 7
- 238000006243 chemical reaction Methods 0.000 claims abstract description 6
- 238000003756 stirring Methods 0.000 claims abstract description 4
- 238000000034 method Methods 0.000 claims description 17
- 239000003795 chemical substances by application Substances 0.000 claims description 14
- 238000011010 flushing procedure Methods 0.000 claims description 6
- 241000191291 Abies alba Species 0.000 claims description 5
- 238000012360 testing method Methods 0.000 claims description 4
- 206010016825 Flushing Diseases 0.000 claims description 3
- 230000035484 reaction time Effects 0.000 claims description 3
- 239000000203 mixture Substances 0.000 claims 1
- 239000000499 gel Substances 0.000 abstract description 8
- 229920002401 polyacrylamide Polymers 0.000 abstract description 7
- 230000015556 catabolic process Effects 0.000 abstract description 5
- 238000006731 degradation reaction Methods 0.000 abstract description 5
- 230000007797 corrosion Effects 0.000 abstract description 3
- 238000005260 corrosion Methods 0.000 abstract description 3
- 229960002089 ferrous chloride Drugs 0.000 abstract 2
- LNOPIUAQISRISI-UHFFFAOYSA-N n'-hydroxy-2-propan-2-ylsulfonylethanimidamide Chemical compound CC(C)S(=O)(=O)CC(N)=NO LNOPIUAQISRISI-UHFFFAOYSA-N 0.000 abstract 2
- 238000001816 cooling Methods 0.000 abstract 1
- 235000011164 potassium chloride Nutrition 0.000 abstract 1
- 239000001103 potassium chloride Substances 0.000 abstract 1
- 238000010276 construction Methods 0.000 description 6
- MHAJPDPJQMAIIY-UHFFFAOYSA-N Hydrogen peroxide Chemical compound OO MHAJPDPJQMAIIY-UHFFFAOYSA-N 0.000 description 4
- OSVXSBDYLRYLIG-UHFFFAOYSA-N dioxidochlorine(.) Chemical compound O=Cl=O OSVXSBDYLRYLIG-UHFFFAOYSA-N 0.000 description 4
- 230000000694 effects Effects 0.000 description 4
- 239000012752 auxiliary agent Substances 0.000 description 3
- 238000005516 engineering process Methods 0.000 description 3
- 238000002474 experimental method Methods 0.000 description 3
- 238000012546 transfer Methods 0.000 description 3
- 239000004155 Chlorine dioxide Substances 0.000 description 2
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 2
- 239000013043 chemical agent Substances 0.000 description 2
- 235000019398 chlorine dioxide Nutrition 0.000 description 2
- 238000002347 injection Methods 0.000 description 2
- 239000007924 injection Substances 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 239000001301 oxygen Substances 0.000 description 2
- 229910052760 oxygen Inorganic materials 0.000 description 2
- 239000000126 substance Substances 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 239000002981 blocking agent Substances 0.000 description 1
- 238000012668 chain scission Methods 0.000 description 1
- 239000004927 clay Substances 0.000 description 1
- 238000005336 cracking Methods 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 238000000605 extraction Methods 0.000 description 1
- 238000001914 filtration Methods 0.000 description 1
- 239000000796 flavoring agent Substances 0.000 description 1
- 235000019634 flavors Nutrition 0.000 description 1
- 239000007789 gas Substances 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 238000009533 lab test Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 239000003129 oil well Substances 0.000 description 1
- 239000007800 oxidant agent Substances 0.000 description 1
- 230000003647 oxidation Effects 0.000 description 1
- 238000007254 oxidation reaction Methods 0.000 description 1
- 238000010525 oxidative degradation reaction Methods 0.000 description 1
- 239000002994 raw material Substances 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 238000012216 screening Methods 0.000 description 1
- 239000000243 solution Substances 0.000 description 1
- 238000003786 synthesis reaction Methods 0.000 description 1
- 238000012795 verification Methods 0.000 description 1
Landscapes
- Addition Polymer Or Copolymer, Post-Treatments, Or Chemical Modifications (AREA)
- Preventing Corrosion Or Incrustation Of Metals (AREA)
- Detergent Compositions (AREA)
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, 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 | Blocking remover for removing blockage of polymer flooding near wellbore zone and preparation and application thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| 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 |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN104650837A true CN104650837A (en) | 2015-05-27 |
| CN104650837B CN104650837B (en) | 2018-07-13 |
Family
ID=53242496
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201310575155.3A Active CN104650837B (en) | 2013-11-15 | 2013-11-15 | Blocking remover for removing blockage of polymer flooding near wellbore zone and preparation and application thereof |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN104650837B (en) |
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 |
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 |
-
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 | 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 |
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 |
Also Published As
| Publication number | Publication date |
|---|---|
| CN104650837B (en) | 2018-07-13 |
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