Development of controllable cross-linking agent for methanol-based fracturing fluid

A cross-linking agent and fracturing fluid technology, applied in the direction of drilling compositions, chemical instruments and methods, etc., can solve the problems of difficult liquid flowback, blockage of formation pores, low permeability, etc., and achieve wide application range and use The effect of small amount and high crosslinking strength

Inactive Publication Date: 2012-06-13
北京希涛技术开发有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] At present, more than 90% of the fracturing fluids used in gas field fracturing are water-based fracturing fluids with water as the dispersion medium. It is a highly water-sensitive gas layer. Since the formation pressure coefficient is much low

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Example Embodiment

[0019] Example 1

[0020] Selection: Select zirconium sulfate as the zirconium source, the mixed solution of water and isopropanol (mass ratio 1:3) as the solvent, and the mixture of triethanolamine, sodium gluconate and xylitol as the ligand.

[0021] Weighing: Weigh 8g zirconium sulfate, 15g water, 45g isopropanol, 1g triethanolamine, 3g sodium gluconate, 3g xylitol.

[0022] Reaction: Add zirconium sulfate to a mixed solvent of water and isopropanol, stir until fully dissolved, adjust the pH to 2, then add it to a three-necked flask equipped with a reflux condenser, heat up to 50°C, and stir to react for 2 hours. Add triethanolamine, sodium gluconate and xylitol, continue to stir and react for 2 hours.

[0023] Neutralization: neutralize the reaction product to pH=4

[0024] Dilution: Add low molecular weight polyacrylic acid and sodium polyacrylate mixture to dilute.

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PUM

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Abstract

The invention relates to a cross-linking agent for alcohol-based fracturing fluids, in particular to the development of a controllable cross-linking agent for methanol-based fracturing fluid, and the cross-linking time of the controllable cross-linking agent can be adjusted. For certain natural gas wells or oil wells with low formation pressure, low permeability and strong water-locking characteristic, the controllable cross-linking agent for methanol-based fracturing fluid can be used in the fracturing stimulation process. Inorganic zirconium or zirconate ester is adopted as a raw material, isopropanol or water or the mixture of isopropanol and water is adopted as solvent, suitable ligand is added, the materials react according to a certain material proportion under certain conditions for 4 hours, neutralizer is then added for neutralization, and finally, a moderate amount of diluent is added, so that the controllable cross-linking agent for methanol-based fracturing fluid is prepared. The cross-linking agent can be cross-linked with polymer with 60 to 100 percent of methanol content, the application range is wide, the dosage is little, and the controllable cross-linking agent cannot harm the environment. The biggest difference between the cross-linking agent disclosed by the invention and organic zirconium series cross-linking agents sold on the market is that mixed diluent formed by low-molecular weight sodium polyacrylate and low-molecular weight polyacrylic acid is adopted as the diluent of the controllable cross-linking agent.

Description

technical field [0001] The invention relates to an alcohol-based fracturing fluid cross-linking agent, in particular to the development of a methanol-based fracturing fluid controllable cross-linking agent with adjustable cross-linking time, which can be used as a cross-linking agent for some formations with low pressure, low permeability and strong Alcohol-based fracturing fluid cross-linking agent for oil and gas field stimulation with water-locking characteristics. Background technique [0002] At present, more than 90% of the fracturing fluids used in gas field fracturing are water-based fracturing fluids with water as the dispersion medium. It is a highly water-sensitive gas layer. Because the formation pressure coefficient is much lower than the pressure coefficient of water in the wellbore, it is easy to cause difficulty in liquid flowback; due to the water locking effect of the formation, it is easy to cause blockage of formation pores and make fracturing stimulation...

Claims

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Application Information

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IPC IPC(8): C09K8/68
Inventor 郝春玲唐富刚
Owner 北京希涛技术开发有限公司
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