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Shear-resistant salt-tolerant fracturing fluid thickening agent

A thickening agent and fracturing fluid technology, applied in chemical instruments and methods, drilling compositions, etc., can solve problems such as poor shear resistance and salt resistance, and achieve strong antibacterial ability, high elastic modulus, excellent The effect of temperature and shear resistance

Active Publication Date: 2020-10-02
SOUTHWEST PETROLEUM UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to provide a shear-resistant and salt-resistant fracturing fluid thickener for the problems of poor shear resistance and salt resistance in the existing cross-linked fracturing fluid system

Method used

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  • Shear-resistant salt-tolerant fracturing fluid thickening agent
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  • Shear-resistant salt-tolerant fracturing fluid thickening agent

Examples

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Effect test

Embodiment 1

[0028] This implementation provides a synthetic and optimized formula of a shear-resistant and salt-resistant fracturing fluid thickener:

[0029] The thickener is made of raw material components acrylamide, acryl glycinamide, N,N'-methylenebisacrylamide, ammonium persulfate, tetramethylethylenediamine, and deionized water. Wherein, the mass of acrylamide and acryloylglycylamide both account for 1.5% of the total mass of all raw materials. The mass of N,N'-methylenebisacrylamide, ammonium persulfate and tetramethylethylenediamine accounted for 0.5% of the total mass of the two monomers of acrylamide and acryloylglycinamide.

[0030] Preparation method: Add deionized water, acrylamide, and acryl glycinamide in turn to the reactor, stir for 10 minutes, then add N,N'-methylenebisacrylamide and ammonium persulfate, stir and dissolve for 5 minutes, and pour into the reactor Introduce nitrogen, stop nitrogen after 20 minutes and add tetramethylethylenediamine, stir for 5 minutes, r...

Embodiment 2

[0034] This implementation provides a synthetic and optimized formula of a shear-resistant and salt-resistant fracturing fluid thickener:

[0035] The thickener is made of raw material components acrylamide, acryl glycinamide, N,N'-methylenebisacrylamide, ammonium persulfate, tetramethylethylenediamine, and deionized water. Among them, the mass of acrylamide and acryloyl glycinamide accounted for 1.5% and 1.55% of the total mass of all raw materials respectively. The mass of N,N'-methylenebisacrylamide, ammonium persulfate and tetramethylethylenediamine accounted for 0.5% of the total mass of the two monomers of acrylamide and acryloylglycinamide.

[0036] The preparation method is the same as in Example 1.

[0037] The shear-resistant and salt-resistant thickener obtained in Example 2 was formulated to compare with the viscoelasticity of ordinary polyacrylamide at the same concentration (3% by mass). see test results figure 2 and image 3 .

[0038] Such as figure 2 a...

Embodiment 3

[0040] This implementation provides a synthetic and optimized formula of a shear-resistant and salt-resistant fracturing fluid thickener:

[0041] The thickener is made of raw material components acrylamide, acryl glycinamide, N,N'-methylenebisacrylamide, ammonium persulfate, tetramethylethylenediamine, and deionized water. Among them, the mass of acrylamide and acryloyl glycinamide accounted for 1.5% and 1.60% of the total mass of all raw materials respectively. The mass of N,N'-methylenebisacrylamide accounts for 0.51% of the total mass of the two monomers of acrylamide and acrylglycylamide. The respective masses of ammonium persulfate and tetramethylethylenediamine account for 0.5% of the total mass of the two monomers of acrylamide and acryloylglycinamide.

[0042] The preparation method is the same as in Example 1.

[0043] The shear-resistant and salt-resistant thickener obtained in Example 3 and common polyacrylamide were respectively prepared into solutions with a co...

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Abstract

The invention discloses a shear-resistant salt-tolerant fracturing fluid thickening agent, which is prepared by carrying out polymerization reaction on raw material monomers, namely acrylamide and a monomer A, in solvent deionized water under the action of a cross-linking agent N,N'-methylene bisacrylamide and an initiator, wherein the monomer A is one of acryloyl glycine amide, acryloyl glycineor vinyl guanidine amine, the initiator is ammonium persulfate or 2-hydroxyl-2-methyl propyl benzene ketone, and the thickening agent is a colloidal thickening agent prepared by carrying out polymerization reaction on acrylamide and a monomer A at the heating temperature of 40-50 DEG C or under the condition of ultraviolet lamp irradiation initiation. According to the thickening agent, a stable network structure is formed by introducing a reversible multi-hydrogen bond supramolecular structure, permanent damage of high-speed shearing to a system structure is effectively resisted, and meanwhilethe salt tolerance of the thickening agent is improved.

Description

technical field [0001] The invention belongs to the technical field of oilfield chemistry, and in particular relates to a shear-resistant and salt-resistant fracturing fluid thickener. Background technique [0002] With the increasing global demand for oil and natural gas and the continuous improvement of oil and gas exploration and development, unconventional oil and gas reservoirs have become the main goal and technical research object of exploration and development. Large-scale hydraulic fracturing technology is an important technical measure to realize the commercial exploitation of unconventional oil and gas. Compared with conventional oil reservoirs, the fracturing fluid used to stimulate tight reservoirs needs to be injected at a higher pumping rate to maximize To optimize the control of reservoir volume, the fracturing fluid system must have a more stable network to maintain sufficient viscosity to resist extreme shear damage during pumping. However, the existing fr...

Claims

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Application Information

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IPC IPC(8): C08F220/56C08F222/38C08F220/60C08F226/06C09K8/68C09K8/88
CPCC08F220/56C08F220/60C08F226/06C09K8/685C09K8/882C09K8/887C08F222/385
Inventor 马应娴朱智郭建春熊雨佳马乐瑶赖杰任冀川
Owner SOUTHWEST PETROLEUM UNIV
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