CN1415688A - Chemical blocking remover for water injection well in oil field - Google Patents
Chemical blocking remover for water injection well in oil field Download PDFInfo
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- CN1415688A CN1415688A CN 02144525 CN02144525A CN1415688A CN 1415688 A CN1415688 A CN 1415688A CN 02144525 CN02144525 CN 02144525 CN 02144525 A CN02144525 A CN 02144525A CN 1415688 A CN1415688 A CN 1415688A
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- water injection
- oil field
- blocking remover
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Abstract
A chemical deblocking agent for water injecting well is oil field contains ClO2 (15-25 wt.%), HCl or HF or their imxture (50-70), corrosion inhibitor (ZUC-5) (5-15), and surfactant (OT-10)(5-15). It can quickly degradate polymer and dissolve polymer mass.
Description
The technical field is as follows: the invention relates to a chemical blocking remover, in particular to a chemical blocking remover for a polymer-containing sewage injection well in an oil field.
Background art: along with the increase of polymer concentration of water injection in an oil field, theproblem of water well blockage is more prominent, and part of water injection wells cannot be injected in a matched mode, even injection under super-fracture pressure, and oil field development is seriously influenced. In 2000 compared with 1998, under the condition that the average single-well water injection pressure is increased by 0.65MPa and the injection allocation is unchanged, the average water shortage of a single well is 48.7m3Meanwhile, the starting pressure is increased from 10.08MPa before injection to 11.87 MPa. The conventional chemical blocking remover can not achieve the purpose of blocking removal.
The invention content is as follows: the invention aims to solve the problem of blockage of an oil field water injection well and develops a chemical blocking remover for the oil field water injection well. The chemical blocking remover consists of the following components in percentage by volume: ClO215 to 25, 50 to 70 acid, 5 to 15 corrosion inhibitor and 5 to 15 surfactant. The acid used is HCl, HF or a mixture of HCl and HF. The corrosion inhibitor is ZUC-5. The surfactant used was OT-10. The invention carries out assay analysis on the water sample containing the polymer sewage well and the water well return (refer to the first table and the second table).
Table one: assay analysis of polymer-containing sewage water sample
| Analysis item | Sample one (ppm) | Sample two (ppm) | Sample three (ppm) |
| Polyacrylamide | 107.7 | 188.9 | 278.0 |
| Sulfate radical | 16.7 | 36.31 | 22.19 |
| Iron ion | 0.43 | 8.32 | 1.72 |
| Magnesium ion | 3.77 | 2.45 | 1.96 |
| Calcium ion | 55.27 | 47.57 | 35.1 |
| Sodium and potassium ions | 1830.8 | 1581.2 | 1913.2 |
| Oil and organic matter | 1100 | 1149 | 959 |
Table two: experimental analysis of flowback of polymer-containing sewage well
| Analysis of Item | Polypropylene Amides of carboxylic acids | Clay and mechanical impurities | Iron sulfide | Iron carbonate | Magnesium carbonate | Calcium carbonate | Sodium oxide and potassium oxide | Oil and organic matter | Unknown substance |
| Content (wt.) ％ | 5 | 53.17 | 1.43 | 2.17 | 1.26 | 0.18 | 6.87 | 24.61 | 5.26 |
According to analysis results, the polymer-containing sewage contains a large amount of sulfate, so that sulfate reducing bacteria in the water are greatly increased, the content of iron sulfide is increased, flocculent precipitates are generated with polyacrylamide, and the blockage of the stratum can be caused. The blocking remover is developed by optimizing the blocking remover aiming at the reasons of stratum blockage, and the main blocking removing mechanism is as follows: due to the oxidizing agent ClO2Has strong oxidizability, and can oxidize polyacrylamide residues and ferrous sulfide into small-molecular polyacrylamide and Fe in an acidic medium3+And SO2 2-： ； . When PAM and FeS are oxidized to form soluble salts, other components in the scale or plug lose their ability to adhere to the pipe or rock and are easily carried away. Via ClO2The oil in the treated liquid is ClO due to the emulsifying material2So oxidized and can not form stable emulsion with water. The blocking remover can degrade and hydrate polymer solutions with different concentrations in a short time, and specific test results are shown in Table III. The blocking remover of the present invention can also dissolve polymer micelles. And (3) placing the micelle in 0.1% of the composite blocking remover to observe the dissolution condition of the micelle, wherein the micelle is completely dissolved after 5 hours, and the specific test result is shown in the fourth table. The blocking remover thoroughly solves the blocking problem of the water injection well in the oil field, and increases the water injection amount of the water well.
Table three: degradation test of composite blocking remover on polymer solution at different times
| Concentration of composite blocking remover (％) | Viscosity (mpa.s) at different times (h) | |||||
| 0 | 0.5 | 1 | 3 | 5 | 7 | |
| 0.03 | 87 | 34.2 | 18.7 | 9.5 | 5.2 | 4.3 |
| 0.05 | 87 | 26.5 | 13.2 | 6.4 | 4.3 | 3.6 |
| 0.08 | 87 | 11.9 | 7.2 | 4.6 | 3.1 | 2.3 |
| 0.1 | 87 | 4.2 | 3.1 | 2 | 1 | 1 |
| 0.5 | 87 | 3.5 | 2.3 | 1 | 1 | 1 |
Table four: degradation test of composite blocking remover on polymers with different viscosities
| Concentration of composite blocking remover (％) | At different times(h) Viscosity (mpa.s) | |||||
| 0 | 0.5 | 1 | 3 | 5 | 7 | |
| 0.1 | 87 | 4.2 | 3.1 | 2 | 1 | 1 |
| 0.1 | 98 | 5.5 | 4.3 | 3.6 | 2 | 1 |
| 0.1 | 134 | 9.8 | 6.4 | 4.6 | 3.1 | 2.3 |
| 0.1 | 176 | 19.2 | 14.5 | 6.7 | 4.2 | 3.2 |
The first embodiment is as follows: the chemical blocking remover of the embodiment comprises the following components in percentage by volume: ClO215-20 parts of acid, 60-70 parts of corrosion inhibitor and 5-10 parts of surfactant. The acid used was a mixture of HCl and HF. The corrosion inhibitor is ZUC-5. The surfactant used was OT-10. The components in the blocking remover are mixed and added into the injection water, so that the blocking remover can reach 3000-5000 ppm in the injection water. And (3) plugging removal is carried out on two polymer-containing sewage injection wells by using the plugging removal agent, wherein the first well (11-252): the well is divided into 6 sections for water injection, and the total well is injected with 200m3D, oil pressure 12.8MPa, practical 110m2The effective thickness of the deblocking layer (PI4-II7-93) is 5.5 m; under the same water injection pressure, under the condition of single-layer water injection, the target layer is formed by 15m before deblocking3D is increased to 59m after blockage removal3D; under the condition that all layers are simultaneously injected with water, the water absorption of the target layer is increased to 39m after the blockage removal from the non-water-absorption state before the blockage removal3And d. Second well (13-2522): the well is divided into 3 sections for water injection, and the total well is filled with 160m3D, oil pressure 14.6MPa, practice 102m3D; unblocking layer (SIII 3)2-III9+102) The effective thickness is 2.9m, under the same waterinjection pressure and under the condition of single-layer water injection, the target layer is increased from non-water-absorption before deblocking to 29m after deblocking3D; under the condition that all layers are simultaneously injected with water, the non-water absorption of the target layer before deblocking is increased to 21m after deblocking3/d。
The second embodiment is as follows: the difference between the first embodiment and the second embodiment is that the chemical blocking remover comprises the following components in percentage by volume: ClO221 to 25, 51 to 59 acid, 5 to 9 corrosion inhibitor and 11 to 15 surfactant. Other components are the same as those in the first embodiment.
Claims (6)
1. The chemical blocking remover for the water injection well of the oil field is characterized by comprising the following components in percentage by volume: ClO215 to 25, 50 to 70 acid, 5 to 15 corrosion inhibitor and 5 to 15 surfactant.
2. The chemical blocking remover for the water injection well in the oil field according to the claim 1, characterized in that it is composed of the following components by volume percentage: ClO215-20 parts of acid, 60-70 parts of corrosion inhibitor and 5-10 parts of surfactant.
3. The chemical blocking remover for the water injection well in the oil field according to the claim 1, characterized in that it is composed of the following components by volume percentage: ClO221 to 25, 51 to 59 acid, 5 to 9 corrosion inhibitor and 11 to 15 surfactant.
4. Chemical deblocking agent for oilfield water injection wells according to claim 1, 2 or 3, characterized in that the acid used is HCl, HF or a mixture of HCl and HF.
5. A chemical deblocking agent for oil field water injection wells according to claim 1, 2 or 3, characterized in that the corrosion inhibitor used is ZUC-5.
6. A chemical deblocking agent for oilfield water injection wells according to claim 1, 2 or 3, characterized in that the surfactant used is OT-10.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 02144525 CN1415688A (en) | 2002-10-31 | 2002-10-31 | Chemical blocking remover for water injection well in oil field |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 02144525 CN1415688A (en) | 2002-10-31 | 2002-10-31 | Chemical blocking remover for water injection well in oil field |
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| CN1415688A true CN1415688A (en) | 2003-05-07 |
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| CN 02144525 Pending CN1415688A (en) | 2002-10-31 | 2002-10-31 | Chemical blocking remover for water injection well in oil field |
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Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1297626C (en) * | 2003-12-22 | 2007-01-31 | 吐哈石油勘探开发指挥部技术监测中心 | Anticorrosion preservative agent special for sleeve for oilfield well drilling and well cementing |
| CN102061154A (en) * | 2010-12-21 | 2011-05-18 | 大庆百晟石油科技有限公司 | Nano high-efficiency composite blockage removing liquid |
| CN101285378B (en) * | 2008-05-09 | 2012-02-01 | 大庆汇联技术开发有限公司 | Activator composite plug removal technology |
| CN102808183A (en) * | 2012-08-21 | 2012-12-05 | 陕西省石油化工研究设计院 | Corrosion inhibitor for inhibiting chlorine dioxide corrosion and preparation method thereof |
| CN103396777A (en) * | 2013-07-22 | 2013-11-20 | 郝占元 | Application of chlorine dioxide blocking remover in coal bed modification |
| CN104194755A (en) * | 2014-08-06 | 2014-12-10 | 党庆功 | Superstrong pincerlike scale dissolving liquid |
| CN105219366A (en) * | 2014-06-18 | 2016-01-06 | 中国石油化工股份有限公司 | A kind of polymer chemistry unblocking agent |
| CN111607376A (en) * | 2020-04-23 | 2020-09-01 | 大庆宇涵井下作业技术服务有限公司 | Ternary composite flooding blockage removal agent for ternary flooding injection well augmented injection technology |
| CN112048292A (en) * | 2020-08-17 | 2020-12-08 | 中海油田服务股份有限公司 | Blockage removing liquid and application thereof |
-
2002
- 2002-10-31 CN CN 02144525 patent/CN1415688A/en active Pending
Cited By (12)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1297626C (en) * | 2003-12-22 | 2007-01-31 | 吐哈石油勘探开发指挥部技术监测中心 | Anticorrosion preservative agent special for sleeve for oilfield well drilling and well cementing |
| CN101285378B (en) * | 2008-05-09 | 2012-02-01 | 大庆汇联技术开发有限公司 | Activator composite plug removal technology |
| CN102061154A (en) * | 2010-12-21 | 2011-05-18 | 大庆百晟石油科技有限公司 | Nano high-efficiency composite blockage removing liquid |
| CN102061154B (en) * | 2010-12-21 | 2012-12-05 | 大庆百晟石油科技有限公司 | Nano high-efficiency composite blockage removing liquid |
| CN102808183A (en) * | 2012-08-21 | 2012-12-05 | 陕西省石油化工研究设计院 | Corrosion inhibitor for inhibiting chlorine dioxide corrosion and preparation method thereof |
| CN103396777A (en) * | 2013-07-22 | 2013-11-20 | 郝占元 | Application of chlorine dioxide blocking remover in coal bed modification |
| CN105219366A (en) * | 2014-06-18 | 2016-01-06 | 中国石油化工股份有限公司 | A kind of polymer chemistry unblocking agent |
| CN104194755A (en) * | 2014-08-06 | 2014-12-10 | 党庆功 | Superstrong pincerlike scale dissolving liquid |
| CN104194755B (en) * | 2014-08-06 | 2017-02-08 | 党庆功 | Superstrong pincerlike scale dissolving liquid |
| CN111607376A (en) * | 2020-04-23 | 2020-09-01 | 大庆宇涵井下作业技术服务有限公司 | Ternary composite flooding blockage removal agent for ternary flooding injection well augmented injection technology |
| CN112048292A (en) * | 2020-08-17 | 2020-12-08 | 中海油田服务股份有限公司 | Blockage removing liquid and application thereof |
| CN112048292B (en) * | 2020-08-17 | 2023-02-28 | 中海油田服务股份有限公司 | Blockage removing liquid and application thereof |
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