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Preparation method of macromolecular crosslinking agent for guanidine gum fracturing fluid

A macromolecular cross-linking agent, guar gum fracturing fluid technology, applied in chemical instruments and methods, drilling composition and other directions, can solve the problem of low temperature resistance of fracturing fluid system, large amount of cross-linking agent, guar gum The problem of large dosage, etc., to achieve the effect of reducing dosage, improving utilization efficiency, and small dosage

Inactive Publication Date: 2019-01-18
CHINA UNIV OF PETROLEUM (EAST CHINA)
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] Compared with traditional inorganic boron and organic boron crosslinking agents, the performance of the crosslinking agent prepared above has been improved to a certain extent, and can meet the technical requirements of on-site fracturing construction to a certain extent, but there are still some shortcomings, such as the amount of guar gum Large size, low temperature resistance of fracturing fluid system, large amount of cross-linking agent, high cost, etc.

Method used

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  • Preparation method of macromolecular crosslinking agent for guanidine gum fracturing fluid

Examples

Experimental program
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preparation example Construction

[0011] (1) Preparation of hydroxymethyl tannic acid

[0012] Add tannic acid, formaldehyde solution (40% concentration), sodium carbonate, water and methanol into a three-neck glass bottle equipped with a stirrer and a spherical condenser, pass N 2 Stir for 30min, control the temperature at 35~65℃, react for 1~20h, evaporate the solvent to dryness, and get it; the molecular weight of tannic acid is 800~2500; the mass of tannic acid, formaldehyde solution, sodium carbonate, water and methanol The ratio is 1:(0.1~5):(0.02~0.35):(0.1~10):(3~40).

[0013] (2) Preparation of Aminated Tannic Acid Matrix

[0014] Add hydroxymethyl tannic acid, polyethylene polyamine, methanol and n-butanol into a three-necked glass bottle equipped with a stirrer and a spherical condenser, pass N 2 Stir for 30min, control the temperature at 60~110°C, react for 1~15h, and evaporate the solvent to dryness to obtain; the mass ratio of hydroxymethyl tannic acid, polyvinylpolyamine, methanol and n-butano...

specific Embodiment approach

[0037] The experimental methods used in the following examples are conventional methods unless otherwise specified.

[0038] The materials, reagents, etc. used in the following examples can be obtained from commercial sources unless otherwise specified.

[0039] The present invention will be further described below with reference to specific embodiments, but the protection scope of the present invention is not limited thereto.

Embodiment 1

[0041] A preparation method of a macromolecular cross-linking agent for guar gum fracturing fluid, comprising the following steps:

[0042] (1) Preparation of hydroxymethyl tannic acid

[0043] Add 10g tannic acid (molecular weight is 1300), 12g formaldehyde solution (40% concentration), 1g sodium carbonate, 5g water, 150g methanol into the three-neck glass bottle equipped with agitator and spherical condenser, pass N 2 Stir for 30min, control the temperature at 45°C, react for 6h, and evaporate the solvent to dryness to obtain hydroxymethyl tannic acid.

[0044] (2) Preparation of Aminated Tannic Acid Matrix

[0045] Add 10g of hydroxymethyl tannic acid, 20g of tetraethylenepentamine, 40g of methanol, and 100g of n-butanol into a three-neck glass bottle equipped with a stirrer and a spherical condenser, pass N 2Stir for 30min, control the temperature at 80°C, react for 4h, and evaporate the solvent to dryness to obtain an aminoated tannic acid matrix.

[0046] (3) Preparat...

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Abstract

The invention relates to a preparation method of a macromolecular crosslinking agent for a guanidine gum fracturing fluid and belongs to the technical field of oilfield chemistry. The preparation method comprises the following steps of by taking tannic acid, formaldehyde and polyethylene polyamine as raw materials, preparing aminated tannic acid as a matrix of the crosslinking agent; performing reaction with polyol and boronic acid, and preparing an organic borate compound; and performing reaction on the organic borate compound and a modified tannic acid matrix, preparing a macromolecular crosslinking agent product capable of crosslinking guanidine gum molecules. Through tests, the product has good solubility in a solution; when being used as the crosslinking agent for the guanidine gum fracturing fluid, the product is relatively small in use amount self, can also remarkably lower the use amount of guanidine gum in a fracturing fluid system and has the certain effect of improving the heat resistance of the fracturing fluid system.

Description

technical field [0001] The invention relates to a preparation method of a macromolecular cross-linking agent for guar gum fracturing fluid, and belongs to the technical field of oilfield chemistry. Background technique [0002] Petroleum is an important strategic resource, and its exploration and development are related to the security and development of the national economy. In recent years, oil exploration and development technology has achieved rapid development, but with the sharp increase in people's demand for energy, the overall supply and demand gap is gradually expanding. Under these conditions, fracturing of oil and gas reservoirs is one of the main measures to increase production and injection of oil and gas wells. Fracturing fluid is a general term for the liquids used in the fracturing process. As the blood of the fracturing process, the performance of the fracturing fluid directly affects the effect of the fracturing construction. Guar gum fracturing fluid sy...

Claims

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Application Information

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IPC IPC(8): C08G79/08C09K8/68C09K8/88
CPCC08G79/08C09K8/685C09K8/882C09K8/887
Inventor 曹杰张建贝宋志峰钟汉毅江琳孙明波雷天猛米恒坤
Owner CHINA UNIV OF PETROLEUM (EAST CHINA)
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