Hydrate decomposition inhibitor suitable for natural gas hydrate formation drilling

A hydrate decomposition and hydrate technology, which is applied in the direction of drilling compositions, chemical instruments and methods, etc., can solve the problems of drilling fluid intrusion into the formation, well wall instability, and well wall collapse, so as to reduce the decomposition rate and ensure Applicability, the effect of prolonging time

Inactive Publication Date: 2019-02-12
CHINA UNIV OF PETROLEUM (EAST CHINA)
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AI Technical Summary

Problems solved by technology

However, increasing the density will intensify the invasion of drilling fluid into the formation, or even pressurize the formation; it is difficult to completely suppress the decomposition of hydrates by simply lowering the temperature of the drilling fluid, and the cooling equipment conditions, energy consumption and efficiency need to be considered
At present, core drilling and trial production of permafrost and marine natural gas hydrate have been carried out at home and abroad. Since no drilling fluid treatment agent that can effectively stabilize the well wall of hydrate formation has been studied, the drilling fluid is mainly treated by cooling equipment. Cool down to avoid or reduce serious well wall instability and safety risks caused by hydrate decomposition, but core failure and well wall collapse caused by hydrate decomposition still occur during operation
However, there are currently no invention patents related to hydrate decomposition inhibitors suitable for drilling in natural gas hydrate formations

Method used

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  • Hydrate decomposition inhibitor suitable for natural gas hydrate formation drilling
  • Hydrate decomposition inhibitor suitable for natural gas hydrate formation drilling
  • Hydrate decomposition inhibitor suitable for natural gas hydrate formation drilling

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preparation example Construction

[0025] In order to further optimize the above technical scheme, the preparation method of poly-3-methylene 2-pyrrolidone specifically comprises the following steps:

[0026] (1) Add 1.0-1.5g of sodium hydride and 11.0-12.0g of diethyl oxalate into diisopropyl ether at a temperature of 30-40°C, and stir evenly;

[0027] (2) Dissolve 6.0-8.0g of 1-tert-butoxycarbonyl-2-pyrrolidone into 30-40mL of diisopropyl ether;

[0028] (3) Add the mixed solution obtained in step (2) dropwise to the mixed solution obtained in step (1) at a temperature of 30-40° C., and stir for 48 hours;

[0029] (4) washing the product obtained by the reaction in step (3) with diisopropyl ether; then dissolving it in dimethylformamide, adding paraformaldehyde and reacting at a temperature of 90-110° C. for 1.5-3 hours;

[0030] (5) The product obtained in step (4) was cooled, filtered, and purified by silica gel column chromatography to obtain 1-tert-butoxycarbonyl-3-methylene-2-pyrrolidone;

[0031] (6) ...

Embodiment 1

[0038] Embodiment 1: drilling fluid+0.1% poly N-vinylpyrrolidone;

Embodiment 2

[0039] Embodiment 2: drilling fluid+1.0% poly N-vinylpyrrolidone;

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Abstract

The invention discloses a hydrate decomposition inhibitor suitable for natural gas hydrate formation drilling. The hydrate decomposition inhibitor is prepared from the following raw materials by masspercent: 0 to 100 percent of poly 3-methylene2-pyrrolidone, 0 to 100 percent of lecithin, and 0 to 100 percent of poly N-vinylpyrrolidone. When the hydrate decomposition inhibitor suitable for naturalgas hydrate formation drilling, provided by the invention is used for ocean or frozen earth natural gas hydrate drilling operation, the decomposition of the hydrate can be effectively inhibited, thestability of the natural gas hydrate formation can be improved, and a series of underground accidents caused by the decomposition of the hydrate can be avoided.

Description

technical field [0001] The invention relates to the technical field of hydrate decomposition inhibitors, in particular to a hydrate decomposition inhibitor suitable for drilling in natural gas hydrate formations. Background technique [0002] Natural gas hydrate is a white solid crystalline substance formed by the interaction of small molecular gases such as light hydrocarbons and water under certain low temperature and high pressure conditions, and can stably occur in low temperature and high pressure areas such as deep seabeds and tundra zones. The current estimated global natural gas hydrate resources are much higher than the total reserves of conventional natural gas and shale gas, theoretically 1m 3 Natural gas hydrate can contain 164m 3 methane and 0.8m 3 of water. Therefore, natural gas hydrate is considered as an alternative energy source with great potential in the future. [0003] Natural gas hydrate formations are mainly composed of soft mudstone, sandy mudsto...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K8/035
CPCC09K8/035
Inventor 赵欣邱正松赵超钟汉毅黄维安徐建根
Owner CHINA UNIV OF PETROLEUM (EAST CHINA)
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