Preparation method of organic aluminum cross-linking agent capable of being cross-linked with W/O inverse emulsion type drag reducer

An inverse emulsion and organoaluminum technology, applied in chemical instruments and methods, drilling compositions, etc., can solve problems such as difficulty in online mixing, reduce labor intensity, facilitate on-site operation, and simplify liquid dispensing process. Effect

Active Publication Date: 2021-02-19
中石化石油工程技术服务有限公司 +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The glue is mainly pre-mixed with a powder-type thickener and stored in a liquid tank. During fracturing, it is pumped to the bottom of the well by a sand mixer truck, and it is difficult to achieve online mixing.

Method used

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  • Preparation method of organic aluminum cross-linking agent capable of being cross-linked with W/O inverse emulsion type drag reducer
  • Preparation method of organic aluminum cross-linking agent capable of being cross-linked with W/O inverse emulsion type drag reducer

Examples

Experimental program
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Effect test

Embodiment 1

[0022] A preparation method of an organoaluminum crosslinking agent crosslinkable with a W / O inverse emulsion type drag reducer, comprising the following steps:

[0023] (1) 6g of polyaluminum chloride and 2g of aluminum hypoacetate are dissolved in 92g of potassium chloride brine with a mass fraction of 1% in a reactor, stirred until completely dissolved, and mixed solution I is prepared;

[0024] (2) Heat the mixed solution I in step (1) to 80° C., slowly add 6 g of sodium gluconate to the mixed solution I while stirring to obtain the mixed solution II;

[0025] (3) The mixed solution II in step (2) was reacted at 80° C. for 3 hours at a constant temperature and then cooled to room temperature to obtain a light yellow uniform transparent clear liquid which was the organoaluminum crosslinking agent.

[0026] The polyaluminum chloride and aluminum hypoacetate in the preparation method are organoaluminum and provide chloride ions; sodium gluconate is an organic matter and provi...

Embodiment 2

[0028] A preparation method of an organoaluminum crosslinking agent crosslinkable with a W / O inverse emulsion type drag reducer, comprising the following steps:

[0029] (1) Dissolve 5g of polyaluminum chloride and 1g of aluminum hypoacetate in 94g of sodium chloride brine with a mass fraction of 1% in a reactor, stir until completely dissolved, and prepare mixed solution I;

[0030] (2) Heat the mixed solution I in step (1) to 90° C., slowly add 5 g of sodium gluconate and 1 g of triethanolamine to the mixed solution I while stirring to obtain the mixed solution II;

[0031] (3) The mixed liquid II in step (2) was reacted at 90° C. for 4 hours at a constant temperature and then cooled to room temperature to obtain a light yellow uniform transparent clear liquid which was the organoaluminum crosslinking agent.

[0032] The polyaluminum chloride and aluminum hypoacetate in the preparation method are organoaluminum, providing chloride ions; sodium gluconate and triethanolamine a...

Embodiment 3

[0034] A preparation method of an organoaluminum crosslinking agent crosslinkable with a W / O inverse emulsion type drag reducer, comprising the following steps:

[0035] (1) 6g of polyaluminum chloride and 2g of aluminum hypoacetate are dissolved in 92g of potassium chloride brine with a mass fraction of 2% in a reactor, stirred until completely dissolved, and mixed solution I is prepared;

[0036] (2) Heat the mixed solution I in step (1) to 80° C., slowly add 5 g of sodium gluconate, 1 g of triethanolamine and 1 g of sodium acetate to the mixed solution I while stirring to obtain the mixed solution II;

[0037] (3) The mixed solution II in step (2) was reacted at 80° C. for 3 hours at a constant temperature and then cooled to room temperature to obtain a light yellow uniform transparent clear liquid which was the organoaluminum crosslinking agent.

[0038] The polyaluminum chloride and aluminum hypoacetate in the preparation method are organoaluminum, providing chloride ions...

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Abstract

The invention relates to a preparation method of an organic aluminum cross-linking agent capable of being cross-linked with a W / O inverse emulsion type drag reducer. The preparation method comprises the following steps: (1) dissolving organic aluminum in water in a reaction kettle, and stirring until the organic aluminum is completely dissolved to prepare a mixed solution I, wherein the mass fraction of first organic aluminum in the mixed solution I is 6-7%, and the mass fraction of second organic aluminum in the mixed solution I is 1-2%; (2) heating the mixed solution I in the step (1) to 50-90 DEG C, dropwise adding an organic complex ligand into the mixed solution I while stirring to obtain a mixed solution II, and ensuring that the mass fraction of organic matters serving as the complex ligand in the mixed solution II is 5-6%; and (3) reacting the mixed solution II in the step (2) at a constant temperature of 50-90 DEG C for 3-5 hours, and cooling to room temperature to obtain a faint yellow uniform transparent clear liquid, namely the organic aluminum cross-linking agent. According to the invention, online mixing of the glue solution can be realized, the fracturing transformation difficulty of the shale oil and gas reservoir is reduced, and the transformation efficiency is improved.

Description

technical field [0001] The invention relates to the technical field of oil and gas reservoir fracturing reconstruction, and more specifically relates to a preparation method of an organoaluminum crosslinking agent which can be crosslinked with a W / O inverse emulsion type drag reducer. Background technique [0002] As the burial depth of shale gas and the length of the horizontal section continue to increase, the amount of fracturing fluid used in the process of reservoir stimulation is increasing. Viscosity and other properties to meet the needs of different sanding and other processes. At present, shale gas exploitation mainly adopts the sand fracturing mode of "pre-acid + slick water + glue", in which the amount of pre-acid is relatively small, and acid skids are used to remove near-well pollution and reduce fracture pressure. Slippery water mainly adopts W / O inverse emulsion type drag reducer to realize online mixing. Viscosity can be realized by adjusting the amount of ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K8/68C09K8/88
CPCC09K8/685C09K8/887C09K2208/28
Inventor 闫秀王冰郝玉芬胡光钟涛袁凯胡泽文张黄鹤
Owner 中石化石油工程技术服务有限公司
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