CN113337262A - Composite descaling method for split-injection water injection well - Google Patents
Composite descaling method for split-injection water injection well Download PDFInfo
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- CN113337262A CN113337262A CN202110629957.2A CN202110629957A CN113337262A CN 113337262 A CN113337262 A CN 113337262A CN 202110629957 A CN202110629957 A CN 202110629957A CN 113337262 A CN113337262 A CN 113337262A
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- injecting
- water
- injection
- scale
- remover
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- 238000002347 injection Methods 0.000 title claims abstract description 51
- 239000007924 injection Substances 0.000 title claims abstract description 51
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 title claims abstract description 42
- 238000000034 method Methods 0.000 title claims abstract description 17
- 239000002131 composite material Substances 0.000 title claims abstract description 8
- 238000005260 corrosion Methods 0.000 claims abstract description 9
- 230000007797 corrosion Effects 0.000 claims abstract description 9
- 239000002283 diesel fuel Substances 0.000 claims abstract description 8
- 239000003112 inhibitor Substances 0.000 claims abstract description 8
- 238000002955 isolation Methods 0.000 claims abstract description 8
- 230000003472 neutralizing effect Effects 0.000 claims abstract description 4
- HEMHJVSKTPXQMS-UHFFFAOYSA-M sodium hydroxide Inorganic materials [OH-].[Na+] HEMHJVSKTPXQMS-UHFFFAOYSA-M 0.000 claims description 15
- VEXZGXHMUGYJMC-UHFFFAOYSA-N Hydrochloric acid Chemical compound Cl VEXZGXHMUGYJMC-UHFFFAOYSA-N 0.000 claims description 8
- PPBRXRYQALVLMV-UHFFFAOYSA-N Styrene Chemical compound C=CC1=CC=CC=C1 PPBRXRYQALVLMV-UHFFFAOYSA-N 0.000 claims description 8
- 238000010276 construction Methods 0.000 claims description 6
- CTQNGGLPUBDAKN-UHFFFAOYSA-N O-Xylene Chemical compound CC1=CC=CC=C1C CTQNGGLPUBDAKN-UHFFFAOYSA-N 0.000 claims description 4
- 239000003513 alkali Substances 0.000 claims description 4
- DBMJMQXJHONAFJ-UHFFFAOYSA-M Sodium laurylsulphate Chemical compound [Na+].CCCCCCCCCCCCOS([O-])(=O)=O DBMJMQXJHONAFJ-UHFFFAOYSA-M 0.000 claims description 3
- -1 benzyl quinoline quaternary ammonium salt Chemical class 0.000 claims description 3
- 230000015572 biosynthetic process Effects 0.000 claims description 3
- 239000003795 chemical substances by application Substances 0.000 claims description 3
- 238000006073 displacement reaction Methods 0.000 claims description 3
- 238000006386 neutralization reaction Methods 0.000 claims description 3
- 235000010482 polyoxyethylene sorbitan monooleate Nutrition 0.000 claims description 3
- 229920000053 polysorbate 80 Polymers 0.000 claims description 3
- 230000008901 benefit Effects 0.000 abstract description 9
- 230000020477 pH reduction Effects 0.000 abstract description 7
- 150000001875 compounds Chemical class 0.000 abstract description 6
- 239000010779 crude oil Substances 0.000 abstract description 4
- 239000001993 wax Substances 0.000 description 6
- 239000003921 oil Substances 0.000 description 4
- 239000003599 detergent Substances 0.000 description 2
- 238000004090 dissolution Methods 0.000 description 2
- 239000003814 drug Substances 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000002474 experimental method Methods 0.000 description 2
- 238000005259 measurement Methods 0.000 description 2
- 239000012188 paraffin wax Substances 0.000 description 2
- 239000008096 xylene Substances 0.000 description 2
- 230000000052 comparative effect Effects 0.000 description 1
- 238000000605 extraction Methods 0.000 description 1
- 239000000376 reactant Substances 0.000 description 1
- 238000000926 separation method Methods 0.000 description 1
- 239000000243 solution Substances 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 230000002195 synergetic effect Effects 0.000 description 1
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Classifications
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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
- C09K8/524—Compositions for preventing, limiting or eliminating depositions, e.g. for cleaning organic depositions, e.g. paraffins or asphaltenes
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B37/00—Methods or apparatus for cleaning boreholes or wells
- E21B37/06—Methods or apparatus for cleaning boreholes or wells using chemical means for preventing or limiting, e.g. eliminating, the deposition of paraffins or like substances
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- Life Sciences & Earth Sciences (AREA)
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Mining & Mineral Resources (AREA)
- Geology (AREA)
- Chemical Kinetics & Catalysis (AREA)
- General Chemical & Material Sciences (AREA)
- Physics & Mathematics (AREA)
- Environmental & Geological Engineering (AREA)
- Fluid Mechanics (AREA)
- Organic Chemistry (AREA)
- Materials Engineering (AREA)
- Geochemistry & Mineralogy (AREA)
- Production Of Liquid Hydrocarbon Mixture For Refining Petroleum (AREA)
Abstract
The invention discloses a composite descaling method for a split injection water injection well, which comprises the following steps: step S1, injecting diesel oil of 0.5m3(ii) a Step S2, injecting wax remover 1m3(ii) a Step S3, injecting isolation slug water 5m3(ii) a Step S4, injecting inorganic scale remover 5m3(ii) a Step S5, injecting isolation slug water 5m3(ii) a Step S6, injecting corrosion inhibitor 1m3(ii) a Step S7, injecting neutralizing lye of 0.2m3(ii) a And step S8, recovering water injection. The compound descaling method for the separate injection water injection well aims at removing complex scale in a pipe column, crude oil on the surface of the scale is removed by diesel oil, wax components in the scale are removed by a wax remover, and inorganic scale is removed by an inorganic scale remover. Compared with a single acidification descaling mode, the method has the advantages of obvious cost reduction and synergy, and can obviously improve the benefit of oilfield development.
Description
Technical Field
The invention relates to a descaling method for oil extraction in an oil field, in particular to a composite descaling method for a split-injection water injection well.
Background
Generally, for the concentric separate injection water injection well of the oil field, because of the lengthening of water injection time, the reduction of water quality of water injection and other reasons, scale with complex components is easily formed in a pipe column, the downward movement of an instrument is difficult, and the measurement and adjustment power of the concentric separate injection well is reduced. Starting from the oil field requirements, aiming at improving the concentric separate injection well measurement and adjustment power and descaling the pipe column, the scale in the pipe column is usually removed in an acidification mode, but because the components of the scale are complex, the conventional acidification generally has stronger capability of removing inorganic scale and poorer capability of removing other types of scale, the problems are that the acidification descaling efficiency is lower and the descaling is not thorough.
Disclosure of Invention
The invention mainly solves the technical problems in the prior art, and provides a composite descaling method for a split injection water injection well.
The technical problem of the invention is mainly solved by the following technical scheme:
a composite descaling method for a split-injection water injection well comprises the following steps:
step S1, injecting diesel oil of 0.5m3The injection rate is 3-5m3/s；
Step S2, injecting wax remover 1m3The injection rate is3-5m3The paraffin remover comprises, by mass, 20-30% of xylene, 10-15% of OP-10, 10-15% of styrene tar, 10-15% of OP-10, 5-10% of Tween 80 and the balance of water;
step S3, injecting isolation slug water 5m3Injecting the maximum displacement under the condition of allowable pressure, and controlling the construction pressure to make the construction pressure be 80% of the small value of the ground wellhead pressure bearing pressure and the formation fracture pressure;
step S4, injecting inorganic scale remover 5m3The injection rate is 3-5m3The inorganic scale remover is kept stand for 4 hours, and the inorganic scale remover comprises 25-40% of hydrochloric acid, 5-10% of benzyl quinoline quaternary ammonium salt chloride, 3-5% of sodium dodecyl sulfate and the balance of water according to the mass ratio;
step S5, injecting isolation slug water 5m3；
Step S6, injecting corrosion inhibitor 1m3The injection rate is 10-15m3The corrosion inhibitor is 65-75% of imidazoline quaternary ammonium derivative, 10-15% of alkynol and the balance of water according to the mass ratio;
step S7, injecting neutralizing lye of 0.2m3The injection rate is 10-15m3The neutralization alkali liquor is 10 percent of sodium hydroxide by mass ratio, and the balance is water;
and step S8, recovering water injection.
The compound descaling method for the separate injection water injection well has the following advantages: the compound descaling method for the separate injection water injection well aims at removing complex scale in a pipe column, crude oil on the surface of the scale is removed by diesel oil, wax components in the scale are removed by a wax remover, and inorganic scale is removed by an inorganic scale remover. Compared with a single acidification descaling mode, the method has the advantages of obvious cost reduction and synergy, and can obviously improve the benefit of oilfield development.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.
FIG. 1 is a flow chart of a compound descaling method for a separate injection water injection well according to the present invention.
Detailed Description
The preferred embodiments of the present invention will be described in detail below with reference to the accompanying drawings so that the advantages and features of the present invention can be more easily understood by those skilled in the art, and the scope of the present invention will be more clearly and clearly defined.
The compound descaling method for the separate injection water injection well comprises the following steps:
step S1, injecting diesel oil of 0.5m3The injection rate is 3-5m3/s；
Step S2, injecting wax remover 1m3The injection rate is 3-5m3The paraffin remover comprises, by mass, 20-30% of xylene, 10-15% of OP-10, 10-15% of styrene tar, 10-15% of OP-10, 5-10% of Tween 80 and the balance of water;
step S3, injecting isolation slug water 5m3Injecting the maximum displacement under the condition of allowable pressure, and controlling the construction pressure to make the construction pressure be 80% of the small value of the ground wellhead pressure bearing pressure and the formation fracture pressure;
step S4, injecting inorganic scale remover 5m3The injection rate is 3-5m3The inorganic scale remover is kept stand for 4 hours, and the inorganic scale remover comprises 25-40% of hydrochloric acid, 5-10% of benzyl quinoline quaternary ammonium salt chloride, 3-5% of sodium dodecyl sulfate and the balance of water according to the mass ratio;
step S5, injecting isolation slug water 5m3；
Step S6, injecting corrosion inhibitor 1m3The injection rate is 10-15m3The corrosion inhibitor is 65-75% of imidazoline quaternary ammonium derivative, 10-15% of alkynol and the balance of water according to the mass ratio;
step S7, injecting neutralizing lye of 0.2m3The injection rate is 10-15m3The neutralization alkali liquor is 10 percent of sodium hydroxide by mass ratio, and the balance is water;
and step S8, recovering water injection.
The diesel oil in the step S1 can dissolve crude oil on the surface of the scale, the surface of the scale is cleaned by a small dosage, the contact area of the later-stage agent and the scale is increased, and the scale removal efficiency is improved.
The effect of this separation section stopper water is the performance interference who prevents between the different medicaments, plays the effect of carrying simultaneously, takes away the reactant of medicament and dirt from the tubular column.
The corrosion inhibitor and the neutralized alkali liquor have the functions of protecting the inner wall of the pipe column and reducing later-stage corrosion.
As shown in Table 1 below, comparative data of dissolution experiments for the conventional detergent (25% hydrochloric acid) and the complex detergent are shown.
TABLE 1 Scale sample dissolution experiment
Obviously, compared with a single acidification descaling mode, the composite descaling agent has obvious cost reduction and synergistic advantages.
The compound descaling method for the separate injection water injection well aims at removing complex scale in a pipe column, crude oil on the surface of the scale is removed by diesel oil, wax components in the scale are removed by a wax remover, and inorganic scale is removed by an inorganic scale remover. Compared with a single acidification descaling mode, the method has the advantages of obvious cost reduction and synergy, and can obviously improve the benefit of oilfield development.
Without being limited thereto, any changes or substitutions that are not thought of through the inventive work should be covered within the scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope defined by the claims.
Claims (1)
1. A composite descaling method for a split-injection water injection well comprises the following steps:
step S1, injecting diesel oil of 0.5m3The injection rate is 3-5m3/s；
Step S2, injecting wax remover 1m3The injection rate is 3-5m3The wax removing agent comprises 20-30% of dimethylbenzene, 10-15% of OP-10, 10-15% of styrene tar and 10-15% of styrene tar in mass ratio% OP-10, 5-10% Tween 80 and the balance water;
step S3, injecting isolation slug water 5m3Injecting the maximum displacement under the condition of allowable pressure, and controlling the construction pressure to make the construction pressure be 80% of the small value of the ground wellhead pressure bearing pressure and the formation fracture pressure;
step S4, injecting inorganic scale remover 5m3The injection rate is 3-5m3The inorganic scale remover is kept stand for 4 hours, and the inorganic scale remover comprises 25-40% of hydrochloric acid, 5-10% of benzyl quinoline quaternary ammonium salt chloride, 3-5% of sodium dodecyl sulfate and the balance of water according to the mass ratio;
step S5, injecting isolation slug water 5m3；
Step S6, injecting corrosion inhibitor 1m3The injection rate is 10-15m3The corrosion inhibitor is 65-75% of imidazoline quaternary ammonium derivative, 10-15% of alkynol and the balance of water according to the mass ratio;
step S7, injecting neutralizing lye of 0.2m3The injection rate is 10-15m3The neutralization alkali liquor is 10 percent of sodium hydroxide by mass ratio, and the balance is water;
and step S8, recovering water injection.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110629957.2A CN113337262B (en) | 2021-06-07 | 2021-06-07 | Composite descaling method for split-injection water injection well |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110629957.2A CN113337262B (en) | 2021-06-07 | 2021-06-07 | Composite descaling method for split-injection water injection well |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN113337262A true CN113337262A (en) | 2021-09-03 |
| CN113337262B CN113337262B (en) | 2022-05-03 |
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Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105754567A (en) * | 2014-12-17 | 2016-07-13 | 中国石油天然气股份有限公司 | Water injection well scale remover and preparation method and application thereof |
| CN106854461A (en) * | 2016-12-11 | 2017-06-16 | 周益铭 | A kind of preparation method of Thief zone fast water injection well scale remover |
| CN108005615A (en) * | 2017-11-22 | 2018-05-08 | 中国石油集团渤海钻探工程有限公司 | A kind of de-plugging construction technology for being used to release the pollution of barium strontium calcium compound scale |
-
2021
- 2021-06-07 CN CN202110629957.2A patent/CN113337262B/en active Active
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105754567A (en) * | 2014-12-17 | 2016-07-13 | 中国石油天然气股份有限公司 | Water injection well scale remover and preparation method and application thereof |
| CN106854461A (en) * | 2016-12-11 | 2017-06-16 | 周益铭 | A kind of preparation method of Thief zone fast water injection well scale remover |
| CN108005615A (en) * | 2017-11-22 | 2018-05-08 | 中国石油集团渤海钻探工程有限公司 | A kind of de-plugging construction technology for being used to release the pollution of barium strontium calcium compound scale |
Non-Patent Citations (2)
| Title |
|---|
| 侯艳宏等: "典型油田用缓蚀剂的热分解特性研究", 《石油炼制与化工》 * |
| 战风涛等: "高效缓蚀性氯化苄基喹啉衍生物制备与表征", 《石油学报》 * |
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| CN113337262B (en) | 2022-05-03 |
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