Compound polyvinyl alcohol drilling fluid for marine hydrate reservoirs

A polyvinyl alcohol and drilling fluid technology, applied in the direction of drilling compositions, chemical instruments and methods, etc., can solve the problems of easy collapse and fracturing of the well wall, destruction of temperature and pressure conditions, and reduction of fracture pressure, so as to avoid pore diameter Severe expansion, good low-temperature stability, and the effect of reducing repeated crushing

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

[0003] (1) When drilling in natural gas hydrate formations, due to the release of formation stress near the well wall and bottom of the reservoir, the formation pressure will decrease; and the drill bit will cut rock, and the friction between the bottom drilling tool and the well wall and core will generate a large amount of Thermal energy destroys the temperature and pressure conditions for the stable existence of hydrates; thus triggering the decomposition of hydrates, resulting in instability of the well wall and adverse effects on drilling operations
[0004] (2) The invasion of drilling fluid and the decomposition of hydrates will lead to the increase of formation pore pressure in different degrees, and the increase of pore pressure will increase the density of drilling fluid required to maintain the stability of the wellbore wall, which not only seriously affects the penetration rate, but also increases the pressure of the wellbore wall. Seepage increases the pore pressure around the well, thereby further reducing the stability of the well wall and forming a vicious circle
Moreover, the decomposition of hydrates will also increase the permeability of the formation, and the drilling fluid will seep into the well wall to generate osmotic pressure, which will increase the collapse pressure of the formation and reduce the fracture pressure, making the well wall more likely to collapse and fracture, reducing the stability of the well wall
[0006] (4) For subsea natural gas hydrate storage, during the drilling process of natural gas hydrate storage, the decomposition of gas hydrate will rapidly increase the ultra-static pore pressure in the storage soil, which may cause submarine landslides or instability of the subsea foundation, which may lead to Cause damage to drilling holes, drilling platforms, submarine pipelines and other facilities
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 polyvinyl alcohol drilling fluid for marine hydrate reservoirs

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0035] Embodiment 1, the content of each component in the drilling fluid is: polyvinyl alcohol mass ratio is 1.8%, sodium chloride mass ratio is 4.5%, methanol mass ratio is 4.5%, ethylene glycol mass ratio is 19%, sulfonated phenolic The mass ratio of resin SMP-2 is 1.8%, the mass ratio of potassium humate is 1.8%, the mass ratio of xanthan gum is 0.4%, the mass ratio of polyvinyl caprolactam is 0.8%, and the mass ratio of polyvinyl methyl ether is 0.8% 1. The mass ratio of tetra-n-hexyltrimethylammonium bromide is 0.8%, and the remaining components are prepared water.

Embodiment 2

[0036] Embodiment 2, the content of each component in the drilling fluid is: polyvinyl alcohol mass ratio is 2%, sodium chloride mass ratio is 5%, methanol mass ratio is 5%, ethylene glycol mass ratio is 20%, sulfonated phenolic The mass ratio of resin SMP-2 is 2%, the mass ratio of potassium humate is 2%, the mass ratio of xanthan gum is 0.5%, the mass ratio of polyvinyl caprolactam is 1%, and the mass ratio of polyvinyl methyl ether is 1%. 1. The mass ratio of tetra-n-hexyltrimethylammonium bromide is 1%, and the remaining components are prepared water.

Embodiment 3

[0037] Embodiment 3, the content of each component in the drilling fluid is: polyvinyl alcohol mass ratio is 2.2%, sodium chloride mass ratio is 5.5%, methanol mass ratio is 5.5%, ethylene glycol mass ratio is 21%, sulfonated phenolic The mass ratio of resin SMP-2 is 2.2%, the mass ratio of potassium humate is 2.2%, the mass ratio of xanthan gum is 0.6%, the mass ratio of polyvinyl caprolactam is 1.2%, and the mass ratio of polyvinyl methyl ether is 1.2%. 1. The mass ratio of tetra-n-hexyltrimethylammonium bromide is 1.2%, and the remaining components are prepared water.

[0038] 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:

[0039] 1 Evaluation of drilling fluid shale hydration inhibition

[0040] Inhibition evaluation experiment is an important part of the indoor evaluation of drilling fluid related performance. The present ...

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Abstract

The invention discloses compound polyvinyl alcohol drilling fluid for marine hydrate reservoirs, and relates to the field of natural gas hydrate mining. The drilling fluid is prepared from the following components: polyvinyl alcohol, sodium chloride, methyl alcohol, ethylene glycol, sulfonated phenolic resin SMP-2, potassium humate, xanthan gum, polyvinyl caprolactam, polyvinyl methyl ether, tetra-n-hexyltrimethyl ammonium bromide and prepared water, can be applied to drilling of submarine natural gas hydrate reservoirs, and has the characteristics of freeness from solid phase and low temperature resistance; a kinetic inhibitor and a synergist are added into the drilling fluid for compounding, so that the drilling fluid has a better hydrate generation inhibition effect; moreover, the drilling fluid components have little harm to the environment, so that the drilling fluid has the advantages of high efficiency, environmental friendliness, cheap and readily-available raw materials and the like.

Description

technical field [0001] The invention relates to a compound type marine hydrate storage polyvinyl alcohol 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, and the former accounts for the vast majority of the discovered quantities. 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. There are a large amount of natural gas hydrates in seabed sediments. Drilling is an essential means to explore and develop natural gas hydrates at a certain depth underground. The phase equilibrium property of gas hydrate 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 com...

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 黄岩李海洋龚鑫晶徐晓明袁鹏飞张晓丽李新宋鑫
Owner DALIAN DONGYOU RUIJIA PETROLEUM TECH CO LTD
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