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Sol enhanced composite acid unplugging liquid and preparation method thereof

A technology for enhancing compounding and sol, applied in chemical instruments and methods, drilling compositions, etc., can solve the problems of inability to simultaneously remove multiple blockages, backward technology of blocking removal measures, and ineffective production enhancement measures, etc. Permeability, eliminate formation pollution, improve the effect of original permeability

Inactive Publication Date: 2018-11-23
兰州凯宏中原石油科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although a variety of measures such as acidizing and fracturing have been used to remove clogging and increase production, none of them can fundamentally solve the problem of clogging in oil reservoirs
The existing production increase measures are ineffective or unsatisfactory. Some plugging removal measures are relatively outdated in technology, and the plugging removal is not thorough. Generally, only one type of plugging can be simply relieved, and multiple types of blockages cannot be relieved at the same time. After the measures, the recovery of production capacity is limited, and the validity period short

Method used

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  • Sol enhanced composite acid unplugging liquid and preparation method thereof
  • Sol enhanced composite acid unplugging liquid and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] A sol-enhanced composite acid plugging solution, which is composed of the following raw materials in parts by weight:

[0031] Main acid 120, sol-modified micellar acid solution 13, corrosion inhibitor 3.5, dispersant 1.5, organic acid 20, clay stabilizer 1.5.

[0032] The organic acid is composed of fluoboric acid, acetic acid and stearic acid in a weight ratio of 17:3.5:1.

[0033] Described dispersant is polysorbate.

[0034] The corrosion inhibitor is composed of calcium ricinoleate and dodecenylsuccinic acid in a weight ratio of 7:3.5.

[0035] The clay stabilizer ammonium chloride.

[0036] Described sol modified micellar acid solution is made up of the raw material of following weight part:

[0037] Orthosilicate 35, hyaluronic acid 14, fluoroboric acid 5, ricinoleic acid polyoxyethylene ether 0.7, ammonium molybdate 1.5, ethyl acetate 25, lanolin 4.

[0038] The preparation method of described sol modified micellar acid solution, comprises the following step...

Embodiment 2

[0046]A sol-enhanced composite acid plugging solution, which is composed of the following raw materials in parts by weight:

[0047] Main acid 140, sol-modified micellar acid solution 15, corrosion inhibitor 5, dispersant 2, organic acid 30, clay stabilizer 2.

[0048] The organic acid is a mixture of fluoboric acid, acetic acid and stearic acid in a weight ratio of 20:4:1.

[0049] Described dispersant is polysorbate.

[0050] The corrosion inhibitor is composed of calcium ricinoleate and dodecenylsuccinic acid in a weight ratio of 9:4.

[0051] The clay stabilizer ammonium chloride.

[0052] Described sol modified micellar acid solution is made up of the raw material of following weight part:

[0053] Tetraethyl orthosilicate 40, hyaluronic acid 17, fluoroboric acid 6, ricinoleic acid polyoxyethylene ether 1, ammonium molybdate 2, ethyl acetate 30, lanolin 5.

[0054] The preparation method of described sol modified micellar acid solution, comprises the following steps: ...

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Abstract

The invention discloses sol enhanced composite acid unplugging liquid, which is prepared from the following raw materials in parts by weight: 100 to 140 parts of main body acid, 10 to 15 parts of solmodified micellar acid solution, 2 to 5 parts of corrosion inhibitors, 1 to 2 parts of dispersing agents, 10 to 30 parts of organic acid and 1 to 2 parts of clay stabilizing agents. According to the method, ethyl orthosilicate is used as a precursor, hydrolysis is performed in a water solution containing hyaluronic acid and fluoboric acid to obtain sol modified micellar acid; the micellar acid hasgood surface viscosity and absorption performance; the filtrate loss controllability of the acidification liquid and friction resistance during pumping can be improved; the residue acid viscosity isimproved, so that the suspension and carrying performance on solid residues can be improved.

Description

technical field [0001] The invention belongs to the technical field, and in particular relates to a sol-reinforced composite acid plugging solution and a preparation method thereof. Background technique [0002] The multi-component acid technology for low-permeability reservoirs is an optimized and improved acid system based on the advantages of organic acids and retarded acid systems, and for the characteristics of acid-sensitive sandstone reservoirs. The acid liquid system comprehensively considers multi-component plugging removal of oil layers, reduces formation damage, improves oil displacement effect, adjusts inter-layer contradictions, and pays attention to compatibility and synergistic efficiency between multi-component plugging removal systems. In this acid solution system, acetic acid is a weak acid, and the reaction speed between acetic acid and rock is relatively slow, and the rock minerals are uniformly dissolved, which can not only expand and dredge the pore thr...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K8/52
CPCC09K8/52C09K2208/28C09K2208/34
Inventor 袁海滨程宝生张慧敏袁建国
Owner 兰州凯宏中原石油科技有限公司
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