Self-polymerization fracturing sand modifier based on supramolecular elastomer and preparation method of self-polymerization fracturing sand modifier

A technology of supramolecular elastomers and modifiers, which is applied in the direction of chemical instruments and methods, drilling compositions, etc., can solve the problems of short effective period, storage of modified fracturing sand, inconvenient transportation and feeding, etc., and achieve prolongation Duration, anti-adhesion, anti-reflux effect

Active Publication Date: 2021-06-25
CHINA UNIV OF PETROLEUM (EAST CHINA)
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Aiming at the deficiencies of the prior art, especially the inconvenient storage, transportation and feeding of modified fracturing sand, and the short effective period of action, the present invention proposes a self-polymerizing fracturing sand modifier based on supramolecular elastomer and its Preparation

Method used

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  • Self-polymerization fracturing sand modifier based on supramolecular elastomer and preparation method of self-polymerization fracturing sand modifier
  • Self-polymerization fracturing sand modifier based on supramolecular elastomer and preparation method of self-polymerization fracturing sand modifier
  • Self-polymerization fracturing sand modifier based on supramolecular elastomer and preparation method of self-polymerization fracturing sand modifier

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0047] The preparation of the self-polymerizing fracturing sand modifier based on the supramolecular elastomer comprises the following steps:

[0048] (1) Preparation of amide prepolymer: using dibasic acid, unit acid and diamine as raw materials, the amide prepolymer is obtained through polycondensation reaction, and its specific preparation steps include:

[0049] ①Put 0.3mol adipic acid, 0.03mol acetic acid and 0.315mol hexamethylenediamine in a three-necked flask, and the molar ratio of the three is 1:0.1:1.05;

[0050] ②Under the protection of nitrogen, gradually raise the temperature to 200°C, and continuously separate the water generated in the flask;

[0051] ③Insulation reaction for 2h to obtain amide prepolymer.

[0052](2) Preparation of supramolecular elastomer: using amide prepolymer and isocyanate as raw materials, the supramolecular elastomer is obtained through grafting reaction, and its specific preparation steps include:

[0053] ① Take 0.3mol amide prepoly...

Embodiment 2

[0057] The preparation of the self-polymerizing fracturing sand modifier based on the supramolecular elastomer comprises the following steps:

[0058] (1) Preparation of amide prepolymer: using dibasic acid, unit acid and diamine as raw materials, the amide prepolymer is obtained through polycondensation reaction, and its specific preparation steps include:

[0059] ① Take 0.3mol phthalic acid, 0.036mol n-hexanoic acid and 0.33mol p-phenylenediamine in a three-necked flask, and the molar ratio of the three is 1:0.12:1.1;

[0060] ②Under the protection of nitrogen, gradually raise the temperature to 210°C, and continuously separate the water generated in the flask.

[0061] ③Insulation reaction for 3h to obtain amide prepolymer;

[0062] (2) Preparation of supramolecular elastomer: using amide prepolymer and isocyanate as raw materials, the supramolecular elastomer is obtained through grafting reaction, and its specific preparation steps include:

[0063] ① Put 0.3mol amide p...

Embodiment 3

[0067] The preparation of the self-polymerizing fracturing sand modifier based on the supramolecular elastomer comprises the following steps:

[0068] (1) Preparation of amide prepolymer: using dibasic acid, unit acid and diamine as raw materials, the amide prepolymer is obtained through polycondensation reaction, and its specific preparation steps include:

[0069] ① Take 0.3 mol of octadecadienoic acid, 0.048 mol of n-butyric acid and 0.345 mol of butanediamine in a three-necked flask, and the molar ratio of the three is 1:0.16:1.15;

[0070] ②Under the protection of nitrogen, gradually raise the temperature to 220°C, and continuously separate the water generated in the flask.

[0071] ③ insulation reaction 5h to obtain amide prepolymer;

[0072] (2) Preparation of supramolecular elastomer: using amide prepolymer and isocyanate as raw materials, the supramolecular elastomer is obtained through grafting reaction, and its specific preparation steps include:

[0073] ①Take 0....

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Abstract

The invention provides a self-polymerization fracturing sand modifier based on a supramolecular elastomer and a preparation method of the self-polymerization fracturing sand modifier. The self-polymerization fracturing sand modifier is prepared by compounding 10%-50% of a supramolecular elastomer, 0.3%-4% of a plasticizer and 46%-89.7% of an alcohol ether cosolvent at room temperature. The compound system can be coated on the surface of fracturing sand in a pre-coating manner, and is carried by fracturing fluid to be pumped into a stratum. In view of the self-healing characteristic of the supramolecular elastomer, the modified fracturing sand also has spontaneous aggregation performance. After the fracturing fluid is subjected to gel breaking at the formation temperature, the supramolecular elastomer in the coating layer at the contact point of the modified fracturing sand can form a reversible physical cross-linked network structure through multiple hydrogen-bond interaction, spontaneous aggregation of the fracturing sand is achieved, and then flowback and backflow of the fracturing sand in the production process are effectively inhibited.

Description

technical field [0001] The invention belongs to the technical field of oil and gas field development hydraulic fracturing, and in particular relates to a supramolecular elastomer-based self-polymerizing fracturing sand modifier and a preparation method thereof. Background technique [0002] Forming fractures with stable geometry and high conductivity is the key to hydraulic fracturing stimulation technology. However, in the later stage of fracturing construction, flowback and subsequent production process are often accompanied by the reflux of fracturing sand, which leads to a significant reduction in fracture conductivity and seriously affects the effect of fracturing operations. In addition, sand cracking by backflow pressure will accelerate the wear of bottomhole and surface equipment, increase operating costs and seriously threaten production safety. [0003] An important means to solve the above problems can be to apply a modifier on the surface of the fracturing sand,...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K8/68C09K8/88C08G18/60
CPCC09K8/68C09K8/88C08G18/603
Inventor 张贵才李建达葛际江乔文丽蒋平裴海华
Owner CHINA UNIV OF PETROLEUM (EAST CHINA)
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