Hydrate inhibitor and preparation method thereof

A technology of hydrate inhibitors and polymerization reaction products, which is applied in the direction of drilling compositions, chemical instruments and methods, etc., can solve the problems that cannot take into account the inhibition of hydrate formation and clay hydration, and achieve excellent low temperature rheology and inhibition non-toxicity, reduce the degree of scouring, and the effect of cheap and easy-to-obtain raw materials

Pending Publication Date: 2022-08-05
BC P INC CHINA NAT PETROLEUM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] The main purpose of the present invention is to provide a hydrate inhibitor and its preparation method to solve the problem in the prior art that the hydrate inhibitor used in drilling fluid cannot suppress both hydrate formation and clay hydration

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  • Hydrate inhibitor and preparation method thereof
  • Hydrate inhibitor and preparation method thereof
  • Hydrate inhibitor and preparation method thereof

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preparation example Construction

[0033] According to another aspect of the present invention, there is provided a preparation method of the above-mentioned hydrate inhibitor, comprising the following steps:

[0034] S1, mixing and reacting raw materials comprising a sulfonic acid-based monomer, a monomer having a lactam cyclic structure, a cationic monomer, an initiator and water to obtain a first crude product;

[0035] S2, mixing the first crude product with an inorganic salt to obtain a hydrate inhibitor.

[0036] The hydrate inhibitor obtained by the above preparation method of the present invention has excellent low-temperature rheology and inhibition, can maintain stable performance under the conditions of -5°C to 50°C, and can effectively reduce the scouring degree of drilling fluid on the formation. It can solve the problem of wellbore instability caused by clay hydration in the drilling process; and the inhibitor has dual inhibition effects of thermodynamics and kinetics, which can not only change the ...

Embodiment 1

[0059] The present embodiment provides a method for preparing a low-temperature hydrate drilling fluid inhibitor, and the specific steps are as follows:

[0060] (1) take by weighing 2.5g triethanolamine and 150 parts by weight of ethanol and place in the round-bottomed flask that reflux condenser is housed to mix, obtain solution a, logical nitrogen deoxygenation 30 minutes under stirring condition, then be heated to be warming up to 70 ℃, Weigh 2.0 g of bromopropene and add it to solution a and stir and mix to obtain solution b. The reaction was carried out under condensation reflux conditions for 24 hours to obtain crude product A. The crude product A was cooled to room temperature, and ethyl acetate and absolute ethanol were used under low temperature conditions. The mixed solvent is recrystallized to obtain a white powder to obtain a product B, and the product B is dried in a vacuum drying oven at 45° C. under vacuum conditions to obtain a product C, that is, a cationic mo...

Embodiment 2

[0064] The present embodiment provides a method for preparing a low-temperature hydrate drilling fluid inhibitor, and the specific steps are as follows:

[0065] (1) take by weighing 2.5g triethanolamine and 150 parts by weight of ethanol and place in the round-bottomed flask that reflux condenser is housed to mix, obtain solution a, logical nitrogen deoxygenation 30 minutes under stirring condition, then be heated to be warming up to 70 ℃, Weigh 2.0 g of bromopropene and add it to solution a and stir and mix to obtain solution b. The reaction was carried out under condensation reflux conditions for 24 hours to obtain crude product A. The crude product A was cooled to room temperature, and ethyl acetate and absolute ethanol were used under low temperature conditions. The mixed solvent is recrystallized to obtain a white powder to obtain a product B, and the product B is dried in a vacuum drying oven at 45° C. under vacuum conditions to obtain a product C, that is, a cationic mo...

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Abstract

The invention provides a hydrate inhibitor and a preparation method thereof. The hydrate inhibitor is prepared from the following raw materials in parts by weight: 0.5 to 2.0 parts of sulfonic monomer, 0.5 to 2.0 parts of monomer with a lactam ring structure, 1.0 to 3.5 parts of cationic monomer, 5 to 15 parts of inorganic salt, 0.1 to 0.4 part of initiator and 50 to 150 parts of water. The inhibitor has excellent low-temperature rheological property and inhibition property, can effectively reduce the scouring degree of drilling fluid to a stratum, and solves the problem of borehole wall instability caused by clay hydration in the drilling process; moreover, the inhibitor has double inhibition effects of thermodynamics and dynamics, the monomer with the lactam ring structure in the inhibitor can be combined with the hydrate crystal through a hydrogen bond, the nucleation time of the hydrate crystal is delayed or further growth of the crystal is prevented, and thus the purpose of effectively inhibiting formation of the hydrate is achieved. And the problems of pipeline blockage and equipment safety blockage caused by hydrate formation are effectively solved.

Description

technical field [0001] The invention relates to the technical field of natural gas hydrate drilling, in particular to a hydrate inhibitor and a preparation method thereof. Background technique [0002] On February 17, 2020, the second round of trial mining of combustible ice in the Chinese sea area was successfully ignited, realizing a substantial increase in the scale of gas production, laying a solid technical foundation for productive trial mining and commercial mining. China has also become the first country in the world to use the horizontal well drilling technology to test the production of natural gas hydrate in the sea area. In the process of natural gas hydrate drilling and production, there is a low temperature and high pressure environment, and the water in natural gas and drilling fluid is easy to form hydrate and accumulate, which not only deteriorates the performance of drilling fluid, but also causes wellbore and circulation pipeline blockage, which induces st...

Claims

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Application Information

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IPC IPC(8): C08F216/14C08F228/02C08F226/06C08F226/10C09K8/035C09K8/524
CPCC08F216/1458C09K8/035C09K8/524C09K2208/22C08F228/02C08F226/06C08F226/10
Inventor 王韧王建龙都伟超汪奇兵屈沅治杨杰孙金声
Owner BC P INC CHINA NAT PETROLEUM CORP
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