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Retarded-acid acidizing fluid

A technology of acidizing fluid and slow acid, which is applied in the direction of chemical instruments and methods, drilling compositions, etc., can solve problems such as clogging, affecting normal production of oil fields, and failing to achieve deep acidizing effects

Inactive Publication Date: 2013-12-11
CHINA UNIV OF PETROLEUM (EAST CHINA)
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

During the acidizing process, although some blockages can be removed, the distance between the wells is relatively large, and the formation particles near the water injection wells gradually migrate to the depth of the formation, and finally gather at a certain position between the wells, resulting in blockage. The formation is completely blocked, and the water injection well cannot inject water, which affects the normal production of the oil field
In conventional soil acidizing, due to the fast reaction rate between the acid liquid and the formation minerals, the penetration distance of the acid is short, resulting in excessive dissolution near the wellbore, and the effect of deep acidizing cannot be achieved.
Therefore, conventional soil acid is not suitable for deep acid treatment of low-permeability reservoirs with high clay content, and only deep acid treatment can obtain better production and injection effects

Method used

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Effect test

Embodiment 1

[0020] Hydrochloric acid, hydrofluoric acid, acidification retarder, acidification corrosion inhibitor, iron ion stabilizer, demulsification aid and clay stabilizer are used to prepare an aqueous solution. The weight percentage of each component in the aqueous solution is: hydrochloric acid, hydrofluoric acid, EL-21 acidification retarder, YHS-2 oil and gas well acidification corrosion inhibitor, CX-301 high temperature and powerful iron ion stabilizer, CX-307 broken Milk drainage aid, potassium chloride and water are 12%, 4%, 3%, 1%, 0.2%, 0.5%, 1% and 78.3% respectively. Mix the components at room temperature, shake well and let stand to prepare slow acid acidification solution.

Embodiment 2

[0022] Hydrochloric acid, hydrofluoric acid, acidification retarder, acidification corrosion inhibitor, iron ion stabilizer, demulsification aid and clay stabilizer are used to prepare an aqueous solution. The parts by weight of the components in the aqueous solution are: hydrochloric acid, hydrofluoric acid, EL-21 acidification retarder, YHS-2 oil and gas well acidification corrosion inhibitor, CX-301 high temperature and powerful iron ion stabilizer, CX-307 demulsification Drainage aid, potassium chloride and water were 14%, 4%, 2%, 1%, 0.2%, 0.5%, 1% and 77.3% respectively. Mix the components at room temperature, shake well and let stand to prepare slow acid acidification solution.

Embodiment 3

[0024] Hydrochloric acid, hydrofluoric acid, acidification retarder, acidification corrosion inhibitor, iron ion stabilizer, demulsification aid and clay stabilizer are used to prepare an aqueous solution. The parts by weight of the components in the aqueous solution are: hydrochloric acid, hydrofluoric acid, EL-21 acidification retarder, YHS-2 oil and gas well acidification corrosion inhibitor, CX-301 high temperature and powerful iron ion stabilizer, CX-307 demulsification Drainage aid, potassium chloride and water were 14%, 4%, 3%, 1%, 0.2%, 0.5%, 1% and 76.3% respectively. Mix the components at room temperature, shake well and let stand to prepare slow acid acidification solution.

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Abstract

The invention relates to the field of oilfield chemical applications and discloses retarded-acid acidizing fluid which is applied to the injection increase of water injection. The formula of the retarded-acid acidizing fluid comprises the following ingredients in percentage by mass: 10-14% of hydrochloric acid, 1-4% of hydrofluoric acid, 1-4% of acidification retarder, 1-2% of acidification a corrosion inhibitor, 0.1-0.5% of an iron ion stabilizer, 0.2-1% of a demulsification and discharge aiding agent, 1-2% of a clay stabilizer and 72.5-85.7% of water. According to the retarded-acid acidizing fluid, the acidification retarder is added into acid liquor, so that the acid-rock reaction time can be prolonged, the effective acting distance of active acids is increased, the effective rate of acidification is increased, and the aim of deep acidification can be achieved; the problem that the deep acidification cannot be achieved because a zone near a well is excessively corroded caused by the fact that the reaction rate between the conventional mud acids and stratum minerals is high can be solved.

Description

technical field [0001] The invention relates to the application field of oil field chemistry, in particular to an acidizing fluid for water injection. Background technique [0002] Acidizing is one of the main measures for oil and gas wells to stabilize and increase production, and water injection wells to stabilize and increase injection. It uses acid liquid to remove pollution near the bottom of production wells and water injection wells, restore formation permeability or dissolve formation rock cement Improve the permeability of the formation and dredge the fluid seepage channels, thereby restoring and improving the productivity of the well. [0003] Most of my country's oil fields are multi-thin layers, with unstable plane distribution and poor physical properties. They are low-porosity and ultra-low-permeability reservoirs. The wells have high water injection pressure, and some wells cannot be injected with water. After being treated by conventional acidification syste...

Claims

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Application Information

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IPC IPC(8): C09K8/74
Inventor 张宏玉曹淑霞张永宁刘志鹏魏金霞高晶王泳华马高红朱昆伦高闯
Owner CHINA UNIV OF PETROLEUM (EAST CHINA)
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