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Cross-linking agent for fracturing and preparation method thereof

A cross-linking agent, fracturing technology

Inactive Publication Date: 2020-12-25
SICHUAN WELDON CHEM
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] In view of the problems that the delay time of the cross-linking agent is not adjustable and the adaptability is narrow, this application proposes a cross-linking agent for fracturing and its preparation method, by adding a delay regulator to the component raw materials for making the cross-linking agent , while controlling the dosage ratio between the delay regulator and other components, so that the crosslinking agent and 0.15% to 0.45% of various PAM aqueous solutions have the effect of freely adjusting the delay time in 10-150 seconds. The stabilizer makes the crosslinking agent more adaptable, and has good compatibility with most polyacrylamide and its derivatives on the market

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] A crosslinking agent for fracturing, comprising the following components in parts by weight, 5 parts of zirconium oxychloride, 5 parts of n-butyl titanate, 5 parts of aluminum trichloride, and 35 parts of deionized water , 5 parts of ethylene glycol, 0.5 parts of sodium hydroxide, 5 parts of acetic acid, 0.1 parts of xylitol, and 1 part of PEG400. After mixing 0.3 parts of the synthetic product with 100 parts of 0.4% aqueous solution of anionic polyacrylamide from manufacturer A, the effect of delaying crosslinking for 180s can be achieved at 70°C, and the compatibility is good.

[0029] The preparation method comprises the following steps:

[0030] (1) Add zirconium oxychloride, n-butyl titanate, aluminum trichloride, and deionized water into the four-necked flask in proportion, raise the temperature of the water bath to 55-85°C, and install a condensate in the four-necked flask Tube, keep reflux for 10-30 minutes;

[0031] (2) Add ethylene glycol in proportion to th...

Embodiment 2

[0036] A crosslinking agent for fracturing, comprising the following components in parts by weight, 15 parts of zirconium oxychloride, 15 parts of titanium tetrachloride, 15 parts of aluminum sulfate, 65 parts of deionized water, 45 parts of of isopropanol, 2 parts of potassium hydroxide, 35 parts of citric acid, 3 parts of mannitol, and 5 parts of PEG800. After mixing 0.3 parts of the synthetic product with 100 parts of a 0.6% aqueous solution of cationic PAM from manufacturer B, the effect of delaying crosslinking for 50s can be achieved at 70°C, and the compatibility is good.

[0037] The preparation method specifically comprises the following steps:

[0038] (1) Add zirconium oxychloride, titanium tetrachloride, aluminum sulfate, and deionized water to the four-necked flask in proportion, raise the temperature of the water bath to 55-85°C, install a condenser in the four-necked flask, and keep Reflux for 10-30 minutes;

[0039] (2) Add isopropanol in proportion to the so...

Embodiment 3

[0044] A crosslinking agent for fracturing, comprising the following components in parts by weight, 8 parts of zirconium oxychloride, 8 parts of titanium dioxide, 8 parts of potassium aluminum sulfate dodecahydrate, 45 parts of deionized water, 10 parts 1 part of triethanolamine, 1 part of sodium carbonate, 10 parts of salicylic acid, 0.5 part of maltitol, 2 parts of PEG10000. After mixing 0.5 parts of the synthetic product with 100 parts of a 0.3% aqueous solution of the manufacturer C zwitterionic polyacrylamine, the effect of delaying crosslinking for 40s can be achieved at 70°C, and the compatibility is good.

[0045] The preparation method specifically comprises the following steps:

[0046](1) Add zirconium oxychloride, titanium dioxide, potassium aluminum sulfate dodecahydrate, and deionized water into the four-necked flask in proportion, raise the temperature of the water bath to 55-85° C., install a condenser in the four-necked flask, Keep reflux for 10-30 minutes; ...

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PUM

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Abstract

The invention relates to the technical field of shale gas fracturing, in particular to a cross-linking agent for fracturing and a preparation method thereof , which are used for solving the problems that the delay time of a conventional polyacrylamide and derivative cross-linking agent thereof is not adjustable and the adaptability is relatively narrow. The cross-linking agent comprises the following components in parts by weight: 5-15 parts of zirconium oxychloride, 5-15 parts of a titanium compound, 5-15 parts of an aluminum salt, 35-65 parts of deionized water, 5-45 parts of polyol, 0.5-2 parts of a hydrolysis reaction catalyst, 5-35 parts of an organic acid, 0.1-3 part of a delay regulator, and 1-5 parts of a dispersion stabilizer. The preparation method comprises the following steps of: mixing the raw materials, and carrying out reflux treatment under certain conditions. According to the cross-linking agent, the delay regulator is added into the component raw materials for preparing the cross-linking agent, meanwhile, the dosage ratio of the delay regulator to the other components is controlled, so that the delay time of the cross-linking agent is freely adjusted to be 10-150seconds, and meanwhile, the added dispersion stabilizer enables the cross-linking agent to have wider adaptability and good compatibility with most polyacrylamide and derivatives thereof in the market.

Description

technical field [0001] The invention relates to the technical field of shale gas fracturing, and is used to solve the problems of non-adjustable delay time and narrow adaptability of conventional polyacrylamide and its derivative cross-linking agents, in particular to a cross-linking agent for fracturing and a preparation method thereof . Background technique [0002] Shale has extremely low permeability and porosity, so the production of natural gas requires the existence of a natural fracture network. In shale areas, fracturing is to form a natural fracture network and create natural gas migration channels. When fracturing, the compatibility of the fracturing fluid needs to be considered, in which the crosslinking agent is the main component. [0003] At present, there are also some studies on cross-linking agents used in fracturing. For example, the overview of delayed cross-linking profile control technology published in "Guangzhou Chemical Industry" No. 01, 2006, expou...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K8/68
CPCC09K8/685C09K8/887C09K8/882
Inventor 何伟王彬刘畅潘铮代友勋
Owner SICHUAN WELDON CHEM