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Compound type frozen soil natural gas hydrate reservoir drilling fluid

A technology for drilling fluid and natural gas, which is applied in the field of drilling fluid for compound permafrost natural gas hydrate storage. It can solve the problems of not considering the use of compound hydrate inhibitors, so as to avoid serious expansion of pore size, prevent lost circulation, and prevent The effect of stuck drill

Inactive Publication Date: 2018-08-24
DALIAN DONGYOU RUIJIA PETROLEUM TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The above drilling fluids all have certain effects on the drilling of natural gas hydrate reservoirs, but none of them consider the use of compound hydrate inhibitors

Method used

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  • Compound type frozen soil natural gas hydrate reservoir drilling fluid
  • Compound type frozen soil natural gas hydrate reservoir drilling fluid
  • Compound type frozen soil natural gas hydrate reservoir drilling fluid

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0039] Embodiment 1, the contents of each component in the drilling fluid are: the mass ratio of sodium silicate is 2.8%, the mass ratio of sodium chloride is 7%, the mass ratio of ethylene glycol is 19%, the mass ratio of potassium humate is 1.8%, The mass ratio of potassium polyacrylate is 1.8%, the mass ratio of xanthan gum is 0.4%, the mass ratio of polyvinylpyrrolidone K90 is 0.8%, the mass ratio of ethylene glycol ether is 0.8%, and the mass ratio of mono-n-butyl glycol ether is 0.8 %, and the remaining components are water for preparation.

Embodiment 2

[0040] Embodiment two, the content of each component in the drilling fluid is: the mass ratio of sodium silicate is 3%, the mass ratio of sodium chloride is 7.5%, the mass ratio of ethylene glycol is 20%, the mass ratio of potassium humate is 2%, The mass ratio of potassium polyacrylate is 2%, the mass ratio of xanthan gum is 0.5%, the mass ratio of polyvinylpyrrolidone K90 is 1%, the mass ratio of ethylene glycol ether is 1%, and the mass ratio of mono-n-butyl glycol ether is 1% %, and the remaining components are water for preparation.

Embodiment 3

[0041] Embodiment three, the contents of each component in the drilling fluid are: the mass ratio of sodium silicate is 3.2%, the mass ratio of sodium chloride is 8%, the mass ratio of ethylene glycol is 21%, the mass ratio of potassium humate is 2.2%, The mass ratio of potassium polyacrylate is 2.2%, the mass ratio of xanthan gum is 0.6%, the mass ratio of polyvinylpyrrolidone K90 is 1.2%, the mass ratio of ethylene glycol ether is 1.2%, and the mass ratio of mono-n-butyl glycol ether is 1.2% %, and the remaining components are water for preparation.

[0042] The drilling fluid configuration methods of the above-mentioned examples 1, 2, and 3 are conventional drilling fluid configuration methods, and are evaluated by the following experimental methods:

[0043] 1 Evaluation of drilling fluid shale hydration inhibition

[0044] Inhibition evaluation experiment is an important part of the indoor evaluation of drilling fluid related performance. The present invention adopts mud...

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Abstract

The invention provides compound type frozen soil natural gas hydrate reservoir drilling fluid and relates to the field of exploitation of natural gas hydrate. The drilling fluid is prepared from the following components: sodium silicate, sodium chloride, ethylene glycol, potassium humate, potassium polyacrylate, xanthan gum, polyvinylpyrrolidone K90, ethylene glycol ethyl ether, mono-n-butyl ethylene glycol ether and preparation water; the drilling fluid can be used for drilling the frozen soil layer natural gas hydrate reservoir and has solid-phase-free and low-temperature-resisting effects;a kinetic inhibitor and a synergist are added into the drilling fluid and are compounded so that the drilling fluid has a relatively strong hydrate generation inhibition effect; the components of thedrilling fluid have small dangers to environment and the drilling fluid has the advantages of high efficiency, environment protection, low-price and easy-to-obtain raw materials and the like.

Description

technical field [0001] The invention relates to a compound type permafrost natural gas hydrate storage drilling fluid, in particular to the field of natural gas hydrate exploitation. Background technique [0002] Natural gas hydrates are mainly distributed in the deep-water areas of the continental margins and the permafrost areas on land. Natural gas hydrate is one of the potential alternative energy sources, and the research on natural gas hydrate is a hot spot in contemporary earth science and energy industry development research. However, most of the researches are on gas hydrates in deep ocean, and there are relatively few studies on gas hydrates in permafrost areas on land. Drilling is an essential means to explore and develop natural gas hydrates at a certain depth in permafrost. The nature of gas hydrate phase equilibrium determines that drilling in this type of formation is very different from drilling in general oil and gas formations, and it also leads to more c...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K8/12
CPCC09K8/12C09K2208/12C09K2208/22C09K2208/34
Inventor 袁鹏飞张晓丽宋鑫黄岩
Owner DALIAN DONGYOU RUIJIA PETROLEUM TECH CO LTD
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