Hydrate mining method and mining device based on reservoir stability
A mining method and hydrate technology, which are applied in the fields of mining fluids, drilling equipment and methods, and earth-moving drilling, etc., can solve the problems of increasing natural gas production and instability of seabed reservoirs, and achieve increasing production, reducing creep, enhancing the effect of strength
Pending Publication Date: 2019-01-22
GUANGZHOU MARINE GEOLOGICAL SURVEY
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Problems solved by technology
[0005] In order to overcome the deficiencies of the prior art, one of the objectives of the present invention is to provide a hydrate production method based on reservoir stability, which utilizes a combination of depressurization and replacement to produce hydrates, which can increase natural gas production and solve the problem of seabed hydrate production. Direct large-scale exploitation of natural gas hydrate may cause destabilization of seabed reservoirs
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[0023] The preferred embodiments of the present invention will be described below in conjunction with the accompanying drawings. It should be understood that the preferred embodiments described here are only used to illustrate and explain the present invention, and are not intended to limit the present invention.
[0024] In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer" etc. The indicated orientation or positional relationship is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the referred device or element must have a specific orientation, or in a specific orientation. construction and operation, therefore, should not be construed as limiting the invention. In addition, the terms "first", "secon...
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The invention discloses a hydrate mining method and mining device based on reservoir stability. The mining device comprises a drilling platform, a hydrate area comprises an upper covering layer, a hydrate layer, a hydrate underlying free gas layer and a lower covering layer which are sequentially arranged from top to bottom, the hydrate layer is provided with a horizontal mining well, a first horizontal auxiliary well is arranged on the contact surface of the hydrate layer and the upper cover layer, a second horizontal auxiliary well is arranged on the contact surface of the hydrate underlyingfree gas layer and the lower covering layer, a first plug is arranged in the first horizontal auxiliary well, a second plug is arranged in the second horizontal auxiliary well, and the drilling platform includes a first drilling platform and a second drilling platform. Hydrate is mined by a combined method of pressure reduction and replacement, natural gas yield can be increased, and device solves the problem that seabed reservoir stability is possibly lost as a large quantity of seabed natural gas hydrate is directly mined.
Description
technical field [0001] The invention relates to a hydrate mining method and a mining device, in particular to a hydrate mining method and a mining device based on reservoir stability. Background technique [0002] Natural gas hydrate is a cage-type crystal compound formed by natural gas water under high-pressure and low-temperature conditions. It is ice-like and ignitable, also known as "combustible ice". Natural gas hydrate is recognized as a new type of green energy that is most likely to replace conventional energy such as coal and petroleum in the 21st century. It has the characteristics of high energy density, clean and environmental protection, wide distribution area, and large resource scale. It is the strategic commanding height of future energy development. [0003] Gas hydrates are mainly distributed in terrestrial permafrost and seabed sediments with a water depth of more than 300 meters. Among them, more than 90% of the world's offshore waters meet the conditions...
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Login to View More IPC IPC(8): E21B43/01E21B7/04E21B47/001E21B43/16
CPCE21B7/046E21B43/01E21B43/168E21B47/001E21B41/0099Y02P90/70
Inventor 梁前勇杨林董一飞钟超张亭亭吴学敏郭斌斌肖曦
Owner GUANGZHOU MARINE GEOLOGICAL SURVEY