Anti-scaling agent and preparation method thereof

A technology of anti-scaling agent and descaling agent, which is applied in the direction of chemical instruments and methods, drilling compositions, etc., can solve the problems of complex construction process, inability to reach deep strata for descaling, and the inability of descaling agent to remove organic impurity clogging, etc. , to achieve the effect of simple construction process, improved measure effect, and improved measure effect

Inactive Publication Date: 2017-06-13
PETROCHINA CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, there are three main problems in this treatment method: one is that the cleaning agent cannot remove the blockage of organic impurities near the wellbore; thirdly, after the cleaning is completed, the scale residue needs to be discharged back, and the construction process is complicated

Method used

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Examples

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Comparison scheme
Effect test

preparation example Construction

[0024] The preparation method of the chelating acid is as follows: according to the above mass percentage, ethylenediaminetetraacetic acid, nitrilotriacetic acid, dichloroethane, ethanol, sodium hydroxide, carbon disulfide, citric acid, acetic acid and water are mixed uniformly.

[0025] Chelating acid injection volume is among them, Is the porosity of the formation; r a To set the processing radius; h is the perforation thickness. Nitrilotriacetic acid is a chelating agent. The chelating acid has the characteristics of online injection, precipitation inhibition and no need for flowback, which is based on its high-efficiency chelating agent.

[0026] 2. Isolation slug construction

[0027] Since the antiscaling agent is alkaline, it is necessary to insert an isolation slug (the medium is water) after acidification. The injection volume of the isolation slug is 80% to 110% of the daily injection volume of the water injection well. Later, if the formation water absorption capacity i...

Embodiment 1

[0048] 1) Online acidification

[0049] A pipeline is connected to the wellhead of the water injection well, and the chelating acid is injected simultaneously with the injected water through the injection pump to acidify the impurities in the vicinity of the well; the chelating acid is calculated by mass percentage, including the following components: ethylene diamine Tetraacetic acid 5.0%; Nitrilotriacetic acid 15.0%; Dichloroethane 8.0%; Ethanol 14.0%; Sodium hydroxide 10.0%; Carbon disulfide 5.0%; Citric acid 3.0%; Acetic acid 1%; The rest is water;

[0050] Chelating acid injection volume is among them, Is the porosity of the formation; r a To set the processing radius; h is the perforation thickness.

[0051] 2) Isolation slug construction

[0052] After acidification, an isolation slug is inserted, the medium is water, and the injection volume of the isolation slug is 80% to 110% of the daily injection volume of the water injection well;

[0053] Specifically, if the water abso...

Embodiment 2

[0070] 1) Online acidification

[0071] A pipeline is connected to the wellhead of the water injection well, and the chelating acid is injected simultaneously with the injected water through the injection pump to acidify the impurities in the vicinity of the well; the chelating acid is calculated by mass percentage, including the following components: ethylene diamine Tetraacetic acid 10.0%; Nitrilotriacetic acid 20.0%; Dichloroethane 5.0%; Ethanol 10.0%; Sodium hydroxide 20.0%; Carbon disulfide 7.0%; Citric acid 2.0%; Acetic acid 0.5%; The rest is water;

[0072] Chelating acid injection volume is among them, Is the porosity of the formation; r a To set the processing radius; h is the perforation thickness.

[0073] 2) Isolation slug construction

[0074] After acidification, an isolation slug is inserted, the medium is water, and the injection volume of the isolation slug is 80% to 110% of the daily injection volume of the water injection well;

[0075] Specifically, if the water a...

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PUM

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Abstract

The invention relates to an anti-scaling agent and a preparation method thereof. The anti-scaling agent comprises the following components by weight percent: 15.0%-20.0% of a barium sulfate anti-scaling agent, 0.10%-0.30% of a wetting inversion agent, 0.10%-0.30% of a surface active agent, 10.0%-15.0% of a mutual solvent, 10.0%-15.0% of a chelating agent and the balance of water. After the anti-scaling agent provided by the invention is injected, the deep part of the ground layer can be cleaned; the back flow is not required; the construction process is simple. The anti-scaling agent provided by the invention has the advantages of wide raw material source, low cost, stable product performance, long service life and long-term storage and use.

Description

Technical field [0001] The invention relates to a scale cleaning and anti-scaling agent and a preparation method thereof, and belongs to the technical field of oil and gas field development. Background technique [0002] During the water injection development process of the oilfield, the incompatibility of the injected water and the formation water in some blocks led to deep formation scaling, resulting in the occurrence of high-pressure under-injection in the water injection well. At present, when treating such under-injection wells, it is usually used to inject scale cleaning agents into the water wells. Through the action of the scale cleaning agents in the formation, part of the formation scale is dissolved to achieve the purpose of reducing pressure and increasing injection. However, there are three main problems with this treatment method: one is that the cleaning agent cannot remove the clogging of organic impurities in the near-well zone; the other is that the cleaning ag...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K8/524C09K8/528
CPCC09K8/524C09K8/528
Inventor 王勇张随望陆小兵隋蕾宋昭杰王尔珍邓志颖李楼楼范希良
Owner PETROCHINA CO LTD
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