Low-friction gelled acid and preparation method thereof

A technology of gelled acid and low friction, which is applied in the direction of chemical instruments and methods, drilling compositions, etc., can solve the problems of increasing the cost of fracturing and acidification, high pressure of high-pressure pump trucks, and large frictional resistance, etc., to save acidification Cost, reduction of frictional resistance, effect of reducing frictional resistance

Inactive Publication Date: 2018-02-02
PETROCHINA CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The gelled acid liquid provided by the prior art has relatively high frictional resistance, that is, the frictional resistance between the gelled acid liquid and the tubing wall is relatively large. When it is necessary to press the gelled acid liquid from the ground into the oil reservoir , the high-pressure pump truck requires a higher pressure, which increases the cost of fracturing and acidizing
At the same time, the gelled acid solution provided by the prior art has serious corrosion on the oil pipe at high temperature, and there is a serious risk of acidification corrosion

Method used

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preparation example Construction

[0050] In the second aspect, the embodiment of the present invention also provides a preparation method of low-friction gelling acid, the preparation method comprising the following steps:

[0051] According to the ratio of each component in the gelling acid, add hydrochloric acid, corrosion inhibitor, corrosion inhibitor synergist, and iron ion stabilizer to the liquid mixing container in sequence, stir evenly, then add water and gelling agent, and stir for 15- After 25 minutes, add drainage aid and mix evenly to obtain low-friction gelling acid.

Embodiment 1

[0067] This embodiment provides a low-friction gelled acid, which comprises the following components in weight percent:

[0068] Gelling agent: 0.2%; Corrosion inhibitor: 2.5%; Corrosion synergist: 0.2%; Iron ion stabilizer: 1.3%; Drainage aid: 1.8%; Hydrochloric acid: 15%; The balance is water.

[0069] Wherein, the gelling agent is composed of a homopolymer of methacryloyloxyethyltrimethylammonium chloride and polyethylene glycol diacrylate, and polyethylene glycol diacrylate is used as a chain extender in the gelling agent The mass fraction of the gelling agent is 0.001%, and the viscosity-average molecular weight of the gelling agent is greater than 10 million. The corrosion inhibitor is quinoline quaternary ammonium salt, the corrosion inhibitor synergist is propynyl alcohol, and the iron ion stabilizer is citric acid and sodium erythorbate. The drainage aid comprises the following components in weight percentage: 65% of polyoxyethylene ether, 10% of ethylene glycol mono...

Embodiment 2

[0074] This embodiment provides a low-friction gelled acid, which comprises the following components in weight percent:

[0075] Gelling agent: 0.5%; Corrosion inhibitor: 2.5%; Corrosion synergist: 1.0%; Iron ion stabilizer: 1.5%; Drainage aid: 1.5%; Hydrochloric acid: 20%; The balance is water.

[0076] Wherein, the gelling agent is composed of a homopolymer of methacryloyloxyethyltrimethylammonium chloride and polyethylene glycol diacrylate, and polyethylene glycol diacrylate is used as a chain extender in the gelling agent The mass fraction of the gelling agent is 0.005%, and the viscosity-average molecular weight of the gelling agent is greater than 10 million. The corrosion inhibitor is Mannich base quaternary ammonium salt, the corrosion synergist is pyroantimonate, and the iron ion stabilizer is sodium nitrilotriacetate and sodium erythorbate. The drainage aid comprises the following components in weight percentage: 75% of polyoxyethylene ether, 10% of ethylene glycol ...

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Abstract

The invention discloses a low-friction gelled acid and a preparation method thereof, and belongs to the field of acidification of oil wells. The low-friction gelled acid is prepared from: by weight, 0.2-0.5% of a gelling agent, 1-4% of a corrosion inhibitor, 0.1-1% of corrosion inhibition synergist, 1-2 % of an iron ion stabilizer, 1-2% of a cleanup additive, 15-23% of hydrochloric acid and the balance water, wherein the gelling agent is composed of a homopolymer of methacryloxyethyl trimethyl ammonium chloride and a chain extender, and the mass fraction of the chain extender in the gelling agent is 0.001-0.005%. According to the low-friction gelled acid provided in the embodiment of the invention, the molecular weight of the homopolymer in the gelling agent is effectively increased by adding the chain extender, so that the tackifying capability and resistance reduction performance of the gelling agent are improved; therefore, the friction of the gelled acid is reduced, the pressure required by a high-pressure pump truck during fracture acidizing is reduced, and energy and the cost of fracture acidizing are saved; meanwhile, by forming a chemical adsorption layer on the surface ofmetal through the cooperation of the corrosion inhibitor and the corrosion inhibition synergist, the corrosion to metal is slowed down.

Description

technical field [0001] The invention relates to the field of oil well acidification, in particular to a low-friction gelling acid and a preparation method thereof. Background technique [0002] Fracturing and acidizing is a commonly used measure for carbonate reservoir improvement. A high-pressure pump truck is used to inject acid liquid into carbonate reservoirs to form large acid-etched fractures with a certain conductivity and eliminate reservoirs. The clogging in the reservoir can communicate with the natural fractures and pores in the reservoir, so as to expand the seepage range of oil and gas in the reservoir and realize the increase of oil or natural gas production. With the increase of oil and gas production depth, the bottomhole pressure of some deep and ultra-deep wells is as high as 130MPa, and the bottomhole temperature is as high as 160°C. Acidification, leading to inefficient increase in production. Therefore, it is very important to provide an acid solution ...

Claims

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Application Information

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IPC IPC(8): C09K8/74C09K8/68
CPCC09K8/68C09K8/74C09K2208/28C09K2208/32
Inventor 吴文刚刘友权王道成张燕向超
Owner PETROCHINA CO LTD
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