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Aid for preventing and controlling natural gas hydrate

A technology of natural gas and additives, applied in drilling composition, gas fuel, gas/liquid distribution and storage, etc., can solve the problems of complex implementation, no provision, no urea involved, etc.

Active Publication Date: 2010-12-08
BEIJING UNITY BENEFICIAL TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0010] Chinese Patent No. ZL02820253.8 "Method for recovering hydrocarbons from hydrates" discloses an aqueous solution that can effectively solve the above problems, but the invention does not involve urea, bisformate, thiourea, dehydroacetic acid Salt, lactic acid salt, also do not provide the specific technical scheme that utilizes urea, bisformic acid salt, thiourea, dehydroacetate, lactic acid salt to solve the above-mentioned problem
At the same time, this method also has defects such as complex implementation, high cost of use, and difficulty in popularization.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0064] A natural gas hydrate prevention and control agent, which includes 20-26% urea aqueous solution by weight; adding 20-26% urea aqueous solution to the natural gas flow channel can reduce the natural gas dew point and solve the problem of freezing and freezing of the natural gas flow channel;

[0065] Experiments show that the freezing point of 20% urea aqueous solution is -6°C, and the freezing point of 26% urea aqueous solution is -11°C, which can melt and dissociate natural gas hydrate and ice, so it can prevent and inhibit the formation of natural gas hydrate;

[0066] Tests have shown that granular commercial urea or an aqueous solution containing granular urea can be added to natural gas pipelines and wellbores by using the existing technology, and can be dissolved in liquid water therein. Therefore, urea can be directly used as a natural gas hydrate prevention and control aid.

Embodiment 2

[0068] Repeat Example 1, the only difference is that the urea aqueous solution contains biuret equivalent to urea.

Embodiment 3

[0070] A natural gas hydrate control additive, which includes 20-25% potassium biformate aqueous solution;

[0071] Experiments show that the freezing point of 20% potassium bisformate aqueous solution is -9°C, and the freezing point of 25% potassium bisformate aqueous solution is -12°C, which can melt and dissociate natural gas hydrate and ice, so it can prevent and inhibit the formation of natural gas hydrate.

[0072] Tests have shown that granular commercial potassium bisformate or an aqueous solution containing granular potassium bisformate can be added to natural gas pipelines and wellbores by using the existing technology, and can be dissolved in liquid water therein, so potassium bisformate can be directly used as natural gas hydrate Control aids.

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Abstract

The invention discloses an aid for preventing and controlling a natural gas hydrate. The aid comprises a prevention and control agent and / or aqueous solution of the prevention and control agent, wherein the prevention and control agent is any one or a mixture of two or more of urea, disilicate, thiourea, dehydrogenated acetate and lactate according to any proportion. The aid can be used for the production and transportation of natural gas to solve the restraining or prevention and control problem of the natural gas hydrate effectively, and can be used for exploiting the natural gas from a natural gas hydrate system or mineral resources and lowering the dew point of the natural gas and solve the problems of freezing and blocking of a natural gas flow channel. The aid has the advantages of easy implementation, safety, reliability, low cost, easy popularization and the like.

Description

technical field [0001] The invention relates to the field of natural gas recovery, gathering and transportation; in particular, it relates to a natural gas hydrate prevention and control additive. Background technique [0002] On page 277, line 2-3 of "Oilfield Chemistry", the first printing of the first edition of China University of Petroleum Press in July 2000, it was stated: "Under certain conditions, natural gas can form hydrates with water, causing natural gas pipelines to produce hydrates. Blockage. In order to solve this problem, we should understand the conditions, structure and suppression method of gas hydrate generation.” Therefore, in the production, storage and transportation of natural gas, the problem of suppression or prevention of gas hydrate must be involved. [0003] Lines 10-11 on page 269 of the "Oilfield Chemistry" once stated: "Under formation conditions, natural gas is in contact with water, so natural gas always contains a certain amount of water va...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K8/52C10L3/10F17D1/02
Inventor 李向东
Owner BEIJING UNITY BENEFICIAL TECH CO LTD
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