A kind of fracturing fluid crosslinking agent and its preparation and application

A technology of cross-linking agent and fracturing fluid, which is applied to chemical instruments and methods, drilling compositions and other directions, can solve the problems of cumbersome procedures, unfavorable construction, combined with the description of reaction methods, etc., and achieves simple preparation process and improved economic benefits. , the effect of low price of raw materials

Active Publication Date: 2018-09-04
PETROCHINA CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The cross-linking agent used in it is usually ferric salt, trivalent aluminum salt, ferric complex compound, all mentioned ferric or trivalent aluminum as cross-linking agent in U.S. Patent US5571315, US5647900, US5271464, domestic Commonly used oil-based fracturing fluids mainly use sodium metaaluminate, and the commonly used cross-linking agents generally have the following deficiencies in the application process: (1) Directly combining ferric solution with amines or polycarboxylic acids does not affect Combined with the description of the reaction mode; (2) In the process of forming fracturing fluid, it is necessary to add additives such as alkali for adjustment, and the process is cumbersome, which is not conducive to construction

Method used

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  • A kind of fracturing fluid crosslinking agent and its preparation and application
  • A kind of fracturing fluid crosslinking agent and its preparation and application
  • A kind of fracturing fluid crosslinking agent and its preparation and application

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0045] Mix 9 parts of ethylene glycol with 27 parts of water to form a composite solvent, place it in a 250ml four-neck flask equipped with a mechanical stirrer, a condenser, and a thermometer, then add 30 parts of iron sulfate and 7 parts of triethanolamine in sequence at 60°C The reaction was carried out for 4 hours. After the reaction was completed, it was left to stand. When the temperature dropped to about 30°C, 3 parts of fatty alcohol polyoxyethylene ether AEO-09 were added and stirred evenly to obtain a crosslinking agent.

Embodiment 2

[0047] Mix 16 parts of glycerol with 52 parts of water to form a composite solvent, place it in a 250ml four-neck flask equipped with a mechanical stirrer, a condenser, and a thermometer, then add 50 parts of iron nitrate and 7 parts of triethanolamine in sequence at 60°C The reaction was carried out for 4 hours. After the reaction was completed, it was left to stand. When the temperature dropped to about 30° C., 8 parts of polyoxyethylene fatty acid ester (produced by Haian Petrochemical Factory in Jiangsu Province) were added and stirred evenly to obtain a crosslinking agent.

Embodiment 3

[0049] Mix 18 parts of glycerol with 35 parts of water to form a composite solvent, place it in a 250ml four-necked flask equipped with a mechanical stirrer, a condenser, and a thermometer, then add 40 parts of iron sulfate and 21 parts of ethanolamine in sequence at 60°C React for 4 hours, let stand after the reaction, and when the temperature drops to about 30°C, add 5 parts of alkylphenol polyoxyethylene ether (OP-10, produced by Shenzhen Qiyanglong Technology Co., Ltd.), and stir evenly to obtain a crosslinking agent .

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Abstract

The invention relates to a fracturing fluid cross-linking agent and a preparation method and application thereof. The cross-linking agent prepared by the invention can rapidly react with dialkyl phosphate, so that gelled fracturing fluid is formed by lower alkanes. The preparation method of the cross-linking agent comprises the following steps: (1) preparing a complex solvent, namely mixing an alcohol and water according to the mass ratio of 1:2-1:4, stirring uniformly, thereby obtaining the complex solvent; (2) sequentially adding the following components in parts by mass into a reaction container: 40-70 parts of the complex solvent, 30-60 parts of a trivalent iron salt and 6-25 parts of a complexing agent, and stirring and reacting at the temperature of 50-70 DEG C for 3-4 hours; and (3) cooling the reaction solution to the temperature of 30 DEG C, adding 2-8 parts of a cross-linking accelerator, uniformly stirring, thereby obtaining the lower alkane anhydrous fracturing fluid cross-linking agent.

Description

technical field [0001] The invention relates to the petroleum field, in particular to a fracturing fluid crosslinking agent and its preparation and application. Background technique [0002] With the deepening of oil and gas reservoir development at home and abroad, especially unconventional reservoirs are becoming the current development hotspot, including tight gas, shale gas and coalbed methane and other unconventional gases are becoming the current and future gas supply and its important components . However, the development of these gas reservoirs faces many special challenges. Water-based fracturing fluids commonly used in low-permeability reservoirs may cause loss of effective fracture half-length due to phase trapping and retention of water injected into the formation. Most tight gas reservoirs (with no original mobile hydrocarbon saturation) are water-wet, exacerbating this problem due to the strong water dispersion coefficient. Therefore, the adoption of low-carb...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09K8/64
CPCC09K8/64
Inventor 卢拥军方波侯向前邱晓惠管保山崔伟香
Owner PETROCHINA CO LTD
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