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 reservoi

Method used

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  • Low-friction gelled acid and preparation method thereof
  • Low-friction gelled acid and preparation method thereof
  • Low-friction gelled acid and preparation method thereof

Examples

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Example Embodiment

[0050] In the second aspect, embodiments of the present invention also provide a method for preparing low-friction gelling acid, which includes the following steps:

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

Example Embodiment

[0066] Example 1

[0067] This embodiment provides a low-friction gelling acid, which includes the following components by weight percentage:

[0068] Gelling agent: 0.2%; corrosion inhibitor: 2.5%; corrosion inhibitor synergist: 0.2%; iron ion stabilizer: 1.3%; drainage aid: 1.8%; hydrochloric acid: 15%; the balance is water.

[0069] Among them, the gelling agent is composed of a homopolymer of methacryloxyethyl trimethylammonium 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 propynol, and the iron ion stabilizer is citric acid and sodium erythorbate. The drainage aid includes the following components by weight percentage: polyoxyethylene ether 65%, ethylene gly...

Example Embodiment

[0073] Example 2

[0074] This embodiment provides a low-friction gelling acid, which includes the following components by weight percentage:

[0075] Gelling agent: 0.5%; corrosion inhibitor: 2.5%; corrosion inhibitor synergist: 1.0%; iron ion stabilizer: 1.5%; drainage aid: 1.5%; hydrochloric acid: 20%; the balance is water.

[0076] Among them, the gelling agent is composed of a homopolymer of methacryloxyethyl trimethylammonium 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 inhibitor synergist is pyroantimonate, and the iron ion stabilizer is sodium triacetate and sodium erythorbate. The drainage aid includes the following components in weight percentage: polyoxyethylene ether 75...

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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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