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Combined integrated water injection well plug removal process method

A process method and technology for water injection wells, applied in chemical instruments and methods, drilling compositions, earthwork drilling and production, etc., can solve problems such as failure to ensure smooth wellbore, secondary blockage, corrosion, etc., and achieve smooth flow and technological process Safe and good compatibility

Inactive Publication Date: 2018-09-28
长春市华泰石油科技开发有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The purpose of the present invention is to solve the technical problem that the existing well flushing method cannot ensure the smooth flow of the wellbore and is prone to corrosion to cause secondary blockage, and provides a combined and integrated water injection well plugging removal process, which can reduce the scale and stratum in the wellbore of the water injection well. Scale and other impurities are dispersed, dissolved and scraped by chemical agents, cyclically cleaned, and synchronously returned to the ground filtration system

Method used

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  • Combined integrated water injection well plug removal process method
  • Combined integrated water injection well plug removal process method
  • Combined integrated water injection well plug removal process method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] The preparation of embodiment 1 inorganic blocking agent

[0026] Weigh 6 parts of hydrochloric acid, 2 parts of hydrofluoric acid, 0.1 part of drainage aid, 1 part of corrosion inhibitor and 0.1 part of iron ion stabilizer into the reaction kettle, add 60 parts of water and stir, raise the temperature to 37°C, and continue stirring for 15 minutes. Then weigh 0.5 parts of surfactant and add it into the reaction kettle, continue to stir for 15 minutes, and then let it stand to obtain an inorganic plug-removing agent.

Embodiment 2

[0027] The preparation of embodiment 2 inorganic blocking agent

[0028] Weigh 8 parts of hydrochloric acid, 4 parts of hydrofluoric acid, 1 part of drainage aid, 2 parts of corrosion inhibitor and 1 part of iron ion stabilizer into the reaction kettle, add 80 parts of water and stir, raise the temperature to 40°C, and continue stirring for 10 minutes. Then weigh 2 parts of the surfactant and add it into the reaction kettle, continue to stir for 15 minutes, and then let it stand to obtain the inorganic plug-removing agent.

Embodiment 3

[0029] Example 3 Combined and integrated water injection well plugging removal process

[0030] S1: pump the inorganic plug-removing agent prepared in Example 1 into the well, and close the well for 12 hours;

[0031] S2: Use a rotary scraper to scrape to the bottom of the well;

[0032] S3: Utilize the skid-mounted filter well-washing vehicle on the ground to wash the well in a circular manner, and filter the fine particle impurities that disperse and dissolve the scale into the skid-mounted well-washing vehicle;

[0033] S4: Circulating the inorganic plugging remover into the well;

[0034] S5: Open the well for water injection, and use the water injection system to unblock the formation.

[0035] Through the above steps, the scale and other impurities formed on the inner wall of the wellbore during the long-term water injection of the water injection well are removed, the wellbore is kept unblocked, and there is no corrosion.

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Abstract

The invention discloses a combined integrated water injection well plug removal process method, and relates to the technical field of oil production engineering. The technical problem that the existing well washing method can not guarantee the unblocking of a shaft and is prone to causing secondary plugging due to corrosion. The process method comprises the following steps that S1, inorganic plugremoval agents are pumped into the well, and the well is shut for 12-24 hours; S2, a rotary scraper is used for scraping from a wellhead to the bottom of the well; S3, a skid-mounted filter well-washing truck on the ground is used for circularly washing the well, and fine particles after dispersing and dissolving are filtered into the skid-mounted filter well-washing truck; S4, the inorganic plugremover agents are circulated into the well; and S5: the well is opened, water is injected, and a water injection system is used for removing the plug of a stratum. The process is safe, environment friendly and reasonable, and does not produce waste liquids, no corrosion exists, the compatibility is good, and the plug of the shaft is removed while the plug of the stratum is removed.

Description

technical field [0001] The invention belongs to the technical field of oil production engineering, and in particular relates to a combined and integrated water injection well plugging removal process method. Background technique [0002] At present, during the long-term water injection process of water injection wells, due to poor water quality compatibility, drilling, repairs, testing, pipeline damage, dynamic shut-off and other factors, the suspended impurities in the water, calcium carbonate and a small amount of magnesium carbonate scale precipitate and adhere to the wellbore. On the inner wall, the diameter of the inner wall of the tubing becomes smaller or even blocked. At present, the main technical means of daily management is to adopt the methods of conventional well flushing and technological well flushing, both of which cannot guarantee the smooth flow of the wellbore, and the use of hydrochloric acid and hydrofluoric acid to remove plugs is prone to corrosion, se...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E21B37/06C09K8/524C09K8/528E21B37/02
CPCC09K8/524C09K8/528E21B37/02E21B37/06
Inventor 邴长智孟志钢
Owner 长春市华泰石油科技开发有限公司
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