Method of producing acidic crosslinking agent for CO2 foam compression fracture

A cross-linking agent and acidic technology, which is applied in the field of preparation of acidic cross-linking agents for CO2 foam fracturing, can solve the problem of high concentration of hydroxypropyl guar gum, poor hanging performance of cross-linked jelly, and low cross-linking strength. High-level problems, easy to operate, low cost, simple preparation process

Active Publication Date: 2008-07-16
BC P INC CHINA NAT PETROLEUM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

CO cross-linked using AC-8 2 Foam fracturing fluid can basically meet the requirements of on-site fracturing construction, but there are also problems such as low cross-linking strength, poor hanging performance of cross-linked jelly, and high concentration of hydroxypropyl guar gum used.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment approach 1

[0019] Embodiment 1: CO of the present invention 2 The acidic crosslinking agent for foam fracturing is a mixture with the weight percentage of the following components:

[0020] Inorganic zirconium salt zirconium sulfate 15.0%; organic auxiliary agent acetylacetone 7.0%; inorganic auxiliary agent hydrochloric acid 3.0%; water 75.0%.

[0021] In the examples, inorganic zirconium salts, organic additives, and inorganic additives belong to commercially available industrial products. The use concentration of inorganic zirconium salts can be selected from 90% to 100%, and the concentration of organic additives can be selected from 50% to 100%. The use concentration of inorganic additives can be selected from 50% to 100%.

Embodiment 1

[0022] Embodiment 1 is the best solution.

Embodiment approach 2

[0023] Embodiment 2: CO of the present invention 2 The acidic crosslinking agent for foam fracturing is a mixture with the weight percentage of the following components:

[0024] Inorganic zirconium salt zirconium tetrachloride 5.0%; organic auxiliary agent glyoxal 10.0%; inorganic auxiliary agent nitric acid 10.0%; water 75.0%.

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PUM

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Abstract

The invention relates to a fracturing liquid system for an oil and gas field, in particular to a manufacturing method of acid crosslinking agent used for CO2 foam fracturing. The invention is characterized in that the acid crosslinking agent is produced by confecting the raw material in the following weight percentage: 5.0 to 30.0 percent of inorganic zirconium salt; 1.0 to 10.0 percent of organic assistant; 0.1 to 20.0 percent of inorganic assistant; 40.0 to 95.0 percent of water. The invention has the advantages of high crosslinking intensity, low cost, easy manufacturing technique, and being easy to operate. .

Description

technical field [0001] The invention relates to an oil and gas field fracturing fluid system, in particular to a CO 2 A method for preparing an acidic crosslinking agent for foam fracturing. Background technique [0002] CO 2 Foam fracturing fluid is a high-quality and low-damage fracturing fluid system. It has the characteristics of high viscosity, strong sand-carrying ability, low filtration loss, clean fracturing fractures, little damage to reservoirs, and easy flowback. Fracturing stimulation of seepage, low pressure and water sensitive reservoirs. Due to CO 2 The pH value of the foam fracturing fluid is between 3 and 4. Therefore, acidic crosslinks are CO 2 Key technology of foam fracturing fluid. Conventional water-based fracturing fluids cross-link under alkaline or neutral conditions, and break gel under acidic conditions. Aiming at the problem of acidic crosslinking, Lu Yongjun et al. used zirconium oxychloride as a crosslinking agent for acidic crosslinking ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K8/70
Inventor 吴金桥宋振云李志航李勇李养池
Owner BC P INC CHINA NAT PETROLEUM CORP
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