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Cross-linking agent capable of forming crosslinking jelly with CJ2-9 densifier and preparation method thereof

A technology of cross-linking agent and thickener, which is applied in the direction of chemical instruments and methods, drilling compositions, etc., can solve the problems of reduced performance of additives, easy to generate adsorption, and affect the effect of fracturing reconstruction, so as to avoid secondary precipitation , Change the effect of rock wettability

Active Publication Date: 2012-10-24
西安长庆化工集团有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] ② The matching is mainly cationic additives, which are prone to adsorption, causing changes in the wettability of formation rocks and degradation of additive performance;
[0006] The above factors greatly affect the effect of fracturing, especially for alkali-sensitive formations, which will cause greater damage to the reservoir

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] Proportioning the following materials according to parts by weight:

[0034] Chromium trioxide 140 parts

[0035] Concentration is 20% sulfuric acid solution 1500 parts

[0036] Sulfosalicylic acid 660 parts

[0037] Ethylenediamine 100 parts

[0038] 30 parts of formic acid

[0039] After proportioning the substances according to the above weight parts, add 20% sulfuric acid solution into the airtight container with agitator, start the agitator, slowly add chromium trioxide, stir for 30 minutes, then raise the temperature to 50°C and add sulfo water For salicylic acid, keep this temperature for 1 hour, then raise the temperature to 70°C, add 100 parts of ethylenediamine, keep the temperature for 2 hours, then add formic acid in turn, and react for 1 hour to form an orange-yellow homogeneous liquid, which is acidic crosslinking agent.

Embodiment 2

[0041] Proportioning the following materials according to parts by weight:

[0042] Chromium trioxide 146 parts

[0043] Concentration is 20% sulfuric acid solution 1750 parts

[0044] Sulfosalicylic acid 730 parts

[0045] Ethylenediamine 150 parts

[0046] 450 parts of acetic acid

[0047] After proportioning the substances according to the above weight parts, add 20% sulfuric acid solution into the airtight container with agitator, start the agitator, slowly add chromium trioxide, stir for 30 minutes, then raise the temperature to 50°C and add sulfo water For ylicic acid, keep this temperature for 1 hour, then raise the temperature to 70°C, add 100 parts of ethylenediamine, keep the temperature for 2 hours, then add acetic acid in turn, and react for 1 hour to form an orange-yellow homogeneous liquid, which is acidic crosslinking agent.

Embodiment 3

[0049] Proportioning the following materials according to parts by weight:

[0050] Chromium trioxide 152 parts

[0051] Concentration is 20% sulfuric acid solution 2000 parts

[0052] Sulfosalicylic acid 800 parts

[0053] Ethylenediamine 200 parts

[0054] 600 parts of formic acid

[0055] After proportioning the substances according to the above weight parts, add 20% sulfuric acid solution into the airtight container with agitator, start the agitator, slowly add chromium trioxide, stir for 30 minutes, then raise the temperature to 50°C and add sulfo water For salicylic acid, keep this temperature for 1 hour, then raise the temperature to 70°C, add 100 parts of ethylenediamine, keep the temperature for 2 hours, then add formic acid in turn, and react for 1 hour to form an orange-yellow homogeneous liquid, which is acidic crosslinking agent.

[0056] serial number Test items unit test result 1 Exterior / Yellow-green homogeneous liquid 2 Den...

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Abstract

The invention relates to a cross-linking agent capable of forming a crosslinking jelly with a CJ2-9 densifier and a preparation method thereof. Currently, a water base fracturing fluid is more likely to be selected for crushing of a reservoir bed home and abroad; but the water base fracturing fluid system has a high pH value and potential damage to a stratum. The cross-linking agent of the invention comprises 140-152 parts of chromic oxide, 1500-2000 parts of sulphuric acid solution with a concentration of 20%, 660-800 parts of sulfosalicylic acid, 100-200 parts of ethidene diamine and 300-600 parts of organic acid. The preparation method comprises steps of: adding the sulphuric acid solution with a concentration of 20% into an enclosed container with a stirrer; starting the stirrer; adding chromic oxide slowly and stirring for 30 min; then heating to 50 DEG C and adding sulfosalicylic acid; maintaining the temperature and reacting for 1 h; heating to 70 DEG C; adding 100 parts of ethidene diamine, maintaining the temperature and reacting for 2 h; and adding organic acids successively and reacting for 1 h to form an orange homogeneous liquid of the acidic cross-linking agent. The invention avoids adsorption between the additive and the stratum to change rock wettability and ensure the realization of additive performances in stratum.

Description

technical field [0001] The invention relates to a cross-linking agent for acidic fracturing fluid that synthesizes a CJ2-9 thickener to form a cross-linked jelly by chemical reaction and a preparation method thereof. technical background [0002] Due to the reliability and economy of the technology, water-based fracturing fluids are mainly used in the fracturing of most reservoirs at home and abroad, and Changqing Oilfield is no exception. Conventional water-based fracturing fluids mainly use the alkali of the guar gum series. Sexual cross-linking system, it has the deficiencies in the following aspects: [0003] ① The pH value of the system is high, and there is potential formation damage after encountering formation ions; [0004] ② The matching is mainly cationic additives, which are prone to adsorption, causing changes in the wettability of formation rocks and degradation of additive performance; [0005] ③The system residue content is high, generally above 300mg / l. ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09K8/68
Inventor 杜彪谢璇杨海燕赵文丁里万华邓卫珍赵燕红郭军吕俊华叶智胡鹏飞李鹏薛小佳吴江吕海燕李强
Owner 西安长庆化工集团有限公司
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