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Low-damage viscous acid and preparation method and application thereof

A technology of thickening acid and acid liquid thickener, which is applied in the direction of chemical instruments and methods, drilling compositions, etc., can solve the problems of poor temperature resistance and salt resistance, easy residue, damage to the formation, etc., to achieve less damage to the formation, Easy to break the gel and delay the effect of acid rock reaction

Active Publication Date: 2019-03-12
陕西志详拓实业有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] Aiming at the problem that the existing polymer thickened acid has poor temperature resistance and salt resistance, and is easy to remain in the formation and damage the formation, the present invention provides a low-damage thickened acid and its preparation method and application. The thickened acid system has Simple operation, easy to break the gel, little damage to the formation, no cross-linking agent added, easy to flow back

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  • Low-damage viscous acid and preparation method and application thereof
  • Low-damage viscous acid and preparation method and application thereof
  • Low-damage viscous acid and preparation method and application thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0022] A low-damage thickened acid, its components by mass fraction: acid thickener 4%, acidification corrosion inhibitor 1%, iron ion stabilizer 1%, hydrochloric acid 18%, calculated as pure acid, and the rest is water;

[0023] The acid thickener is a mixture of oleamidopropyl dimethylamine (FLY) and hexadecyl dimethyl tertiary amine (FL16), with a mass ratio of 2.75:1.25;

[0024] The iron ion stabilizer is a mixture of citric acid and sodium isotretinoin with a mass ratio of 4:1.

[0025] The preparation method of low-harm thickened acid is realized through the following steps:

[0026] Mix the mixture of oleamidopropyl dimethylamine (FLY) and hexadecyl dimethyl tertiary amine (FL16) with the acid solution in the container evenly in proportion, then add 1% acidification corrosion inhibitor and 1% iron in sequence Ionic stabilizer, after mixing, stir evenly to form a thickened acid solution.

[0027] On the HAKKE MARSⅢ rheometer, the product in embodiment 1 is evaluated f...

Embodiment 2

[0030] A low-damage thickened acid, its components by mass fraction: 2% acid thickener, 2% acidification corrosion inhibitor, 2% iron ion stabilizer, 18% hydrochloric acid, calculated as pure acid, and the rest is water;

[0031] The acid thickener is a mixture of oleamidopropyl dimethylamine (FLY) and hexadecyl dimethyl tertiary amine (FL16), with a mass ratio of 2.75:1.25;

[0032] The iron ion stabilizer is a mixture of citric acid and sodium isotretinoin with a mass ratio of 4:1.

[0033] The preparation method of low-harm thickened acid is realized through the following steps:

[0034] Mix the mixture of oleyl amidopropyl dimethylamine (FLY) and hexadecyl dimethyl tertiary amine (FL16) with the acid solution in the container evenly, then add 2% acidification corrosion inhibitor and 2% iron in sequence Ionic stabilizer, after mixing, stir evenly to form a thickened acid solution.

[0035] On the HAKKE MARSⅢ rheometer, the product in embodiment 2 is evaluated for shear st...

Embodiment 3

[0037] A low-damage thickened acid, its components by mass fraction: acid thickener 3%, acidification corrosion inhibitor 2%, iron ion stabilizer 1%, hydrochloric acid 15%, calculated as pure acid, and the rest is water;

[0038] The acid thickener is a mixture of oleamidopropyl dimethylamine (FLY) and hexadecyl dimethyl tertiary amine (FL16), with a mass ratio of 2.5:1.5;

[0039] The iron ion stabilizer is a mixture of citric acid and sodium isotretinoin with a mass ratio of 4:1.

[0040] The preparation method of low-harm thickened acid is realized through the following steps:

[0041] Mix the mixture of oleamidopropyl dimethylamine (FLY) and hexadecyl dimethyl tertiary amine (FL16) with the acid solution in the container evenly, then add 2% acidification corrosion inhibitor and 1% iron in sequence Ionic stabilizer, after mixing, stir evenly to form a thickened acid solution.

[0042] On the HAKKE MARSⅢ rheometer, the product in embodiment 3 is evaluated for shear stabili...

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Abstract

The invention discloses low-damage viscous acid. Based on the total weight of viscous acid liquid, the low-damage viscous acid is prepared from the following components in percentage by mass: 2-10% ofan acid liquid thickener, 1-4% of an acidizing corrosion inhibitor, 1-3% of an iron ion stabilizer, 10-28% of acid and the balance of water. A viscoelastic surfactant serves as the thickener to be used in acidizing, thus the reaction rate of acid rock can be effectively decreased, acid wormholes with good flow conductivity are generated, and deep acidification is achieved; and compared with polymer-type viscous acid, a surfactant-type viscous acid system has the advantages that raw materials are easy to obtain, preparation is easy, gel breaking is easy, damage to a formation is small, no crosslinking agent is added, and flowback is easy.

Description

technical field [0001] The invention relates to a low-damage viscous acid and its preparation method and application, belonging to the technical field of oil and gas field acidizing and fracturing. technical background [0002] With the rapid development of the economy, the demand for oil and gas in my country is increasing. In addition, the development of old oil fields in the east has entered the middle and late stages, and the effect of conventional production increase measures has become negligible. Therefore, unconventional oil and gas fields have become a hot spot for exploration and development. Acidification technology is widely used as an effective measure to increase production, and the effect of acidification mainly depends on the performance of the acidification working fluid. [0003] However, conventional acid solutions have many disadvantages, such as the acid-rock reaction is too fast, causing the acid solution to be consumed prematurely and fail to reach the...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K8/74
CPCC09K8/74
Inventor 毛金成王晨杨小江毛金桦张恒
Owner 陕西志详拓实业有限公司
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