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Hyperbranched polytertiary amine shale inhibitor

A technology of shale inhibitors and hyperbranched polymers, which is applied in the field of oil and gas field drilling, can solve the problems of oil-based drilling fluids that are not environmentally friendly, high circulation loss tendency, vicious leakage, etc., and achieve low price, good inhibition performance, and not easy to agglomerate Effect

Active Publication Date: 2021-09-21
SOUTHWEST PETROLEUM UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In order to solve the problems of deep shale exploration and development, oil-based drilling fluid was used at the beginning. However, due to the disadvantages of oil-based drilling fluid, such as non-environmental protection, high cost, and high tendency of circulation loss, especially vicious leakage, it has become my country's deep shale gas energy source. major obstacle to industrial development

Method used

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  • Hyperbranched polytertiary amine shale inhibitor

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] Add 0.6mol 1,5-hexadiene into a dry flask, stir and dissolve with 90mL tetrahydrofuran, add 1.2mol 3,5-dihydroxyphenylhydrazide dropwise while stirring, nitrogen for 30min, and react at a temperature of 40°C 12h, after completion of the reaction, rotary evaporation obtains hyperbranched polymer;

[0021] Dissolve the tertiary amine hyperbranched polymer obtained in the previous step in 140mL of toluene, add 154mL of N-isopropylacrylamide with a concentration of 60%, after the dropwise addition, pass nitrogen gas at 80°C for 30min, and reflux the reaction 8h, after the reaction was over, a hyperbranched polymer with amide groups was obtained by distillation under reduced pressure.

Embodiment 2

[0023] Add 0.6 mol of diallylamine into a dry flask, stir and dissolve with 90 mL of tetrahydrofuran, add 1.2 mol of 3-hydroxybenzoic acid hydrazine dropwise while stirring, nitrogen for 30 min, react at 40°C for 12 h, after the reaction is completed , rotary evaporation to obtain hyperbranched polymer;

[0024] The tertiary amine hyperbranched polymer obtained in the previous step was dissolved in 140 mL of toluene, and 154 mL of N-isopropylmethacrylamide with a concentration of 60% was added. After the addition was completed, nitrogen gas was introduced at a temperature of 80° C. for 30 minutes. Reflux reaction for 8 hours, and after the reaction was completed, a hyperbranched polymer with amide groups was obtained by distillation under reduced pressure.

Embodiment 3

[0026] Add 0.6mol of N-methyldiallylamine into a dry flask, stir and dissolve with 90mL of tetrahydrofuran, add 1.2mol of 2,4-dihydroxyphenylhydrazide dropwise while stirring, nitrogen for 30min, at a temperature of 40°C Down reaction 12h, after completion of reaction, rotary evaporation obtains hyperbranched polymer;

[0027] The tertiary amine hyperbranched polymer obtained in the previous step was dissolved in 140 mL of toluene, and 154 mL of 60% N-(2-hydroxypropyl) methacrylamide was added. Into nitrogen for 30 minutes, reflux reaction for 8 hours, after the reaction was completed, a hyperbranched polymer with amide groups was obtained by distillation under reduced pressure.

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Abstract

The invention relates to a hyperbranched polytertiary amine shale inhibitor, and belongs to the technical field of oil and gas field drilling. Hyperbranched polytertiary amine is synthesized by using a hydroxyl-containing hydrazine compound, a diallyl compound and an acrylamide compound as raw materials. The shale inhibitor prepared from the hydrazine compound containing hydroxyl, the diallyl compound and the acrylamide compound is prepared by mixing hyperbranched polytertiary amine and water, wherein the mass ratio of the hyperbranched polytertiary amine in the shale inhibitor is 0.6%-3.5%. The inhibition performance of the shale inhibitor prepared from the hyperbranched polytertiary amine provided by the invention is obviously improved compared with that of similar inhibitors, the raw materials are easy to obtain and low in price, and the provided synthesis method is stable and reliable and is suitable for industrial production.

Description

technical field [0001] The invention relates to the technical field of oil and gas field drilling, in particular to a shale inhibitor made of hyperbranched polytertiary amine. Background technique [0002] As the largest developing country and the largest oil and gas consumer and importer in China, the gap between domestic oil and gas supply and demand continues to expand. In 2019, the dependence on foreign oil has reached 72.5%, and the dependence on natural gas has reached 45.3%. Oil and gas supply security is facing huge challenges. challenge. my country is rich in shale oil and gas resources, but about 65% of shale burial depths exceed 3500m, and the deep shale gas resources in the southern Sichuan Basin account for 86.5% of the total resources in the entire southern Sichuan Basin. Therefore, accelerating the exploration and development of deep shale gas is the only way to accelerate the construction of a clean, low-carbon, safe and efficient modern energy system. [0...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08G83/00C09K8/035
CPCC08G83/006C08G83/005C09K8/035
Inventor 谢刚陈宇邓明毅范莉罗玉婧雷震谷硕曹少帅黄国豪
Owner SOUTHWEST PETROLEUM UNIV
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