Shuangl Well Structure and Method for Exploiting Marine Hydrate Reservoir by Fracturing

A technology for hydrate and fracturing wells, which is applied in the direction of production fluid, earth drilling, wellbore/well components, etc., and can solve problems such as long cycle, poor permeability, and large energy loss

Active Publication Date: 2020-06-05
BC P INC CHINA NAT PETROLEUM CORP +2
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  • Abstract
  • Description
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Problems solved by technology

However, since gas hydrate usually occurs in silt, fine silt and mud shale, and its own ice crystal form will block the flow channels, the permeability of gas hydrate reservoirs is often poor. The heat transfer and conductivity are greatly limited, and there are problems such as slow mining speed, long cycle, large energy loss, and low efficiency.

Method used

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  • Shuangl Well Structure and Method for Exploiting Marine Hydrate Reservoir by Fracturing

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Embodiment Construction

[0037] Specific embodiments of the present invention will be described in detail below in conjunction with the accompanying drawings. It should be understood that the specific embodiments described here are only used to illustrate and explain the present invention, and are not intended to limit the present invention.

[0038] In the present invention, unless otherwise specified, the used orientation words such as "up and down" usually refer to up and down in the state of installation and use.

[0039] In the present invention, for ease of understanding, the internal structure of the ocean is simply divided into sea level 12 , seawater layer 13 , mud line 14 , caprock 15 , hydrate layer 16 and stratum 17 distributed sequentially from top to bottom.

[0040] One aspect of the present invention provides a double-L well structure for exploiting marine hydrate reservoirs by fracturing, including:

[0041] Injection well 2, the injection well 2 is set to extend from the sea level 1...

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Abstract

The invention relates to the field of exploiting marine hydrate reservoirs, and discloses a double-L well structure and method for exploiting marine hydrate reservoirs by fracturing, according to thedouble-L well structure, the carbon dioxide fracturing fluid is injected into the region between a first fracturing well and a second fracturing well arranged in the hydrate layer, the upper part andthe lower part are both a hydrate generation fracture, the formed fracture can effectively improve the permeability of the hydrate layer, the carbon dioxide fracturing fluid penetrates into the fracture, the decomposition of the natural gas hydrate is promoted, the structure has the advantages of improving the permeability of the reservoirs, fast mining speed, small energy loss, and high efficiency and the like.

Description

technical field [0001] The invention relates to the technical field of exploitation of marine hydrate reservoirs, in particular to a double-L well structure and method for utilizing fracturing to exploit marine hydrate reservoirs. Background technique [0002] Natural gas hydrate has the characteristics of rich reserves, wide distribution, high energy density, and relatively clean after combustion. Various countries regard it as an environmentally friendly alternative to traditional fossil energy in the future. Studies have shown that nearly 90% of the world's oceans meet the conditions for the occurrence of gas hydrates. The rational development and utilization of marine hydrate resources is of great significance to alleviate the energy crisis and enrich the energy structure. [0003] According to the phase equilibrium properties of hydrates, natural gas hydrate production methods including heat shock method, depressurization method, chemical agent injection method and car...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): E21B43/30E21B43/26E21B43/16
CPCE21B43/164E21B43/26E21B43/305
Inventor 陈野孙宝江高永海王志远陈立涛赵欣欣张贺恩
Owner BC P INC CHINA NAT PETROLEUM CORP
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