Permafrost region natural gas hydrate horizontal butted well exploiting system and method
A mining method and technology for natural gas, applied in the fields of mining fluids, earthwork drilling, drilling equipment, etc., can solve problems such as loss of mining equipment, energy waste, condensation, etc., and achieve the effect of reducing working pressure, realizing mining work, and shortening heating time.
Active Publication Date: 2020-10-09
OIL & GAS SURVEY CGS +2
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Problems solved by technology
[0007] For this reason, the embodiment of the present invention provides a natural gas hydrate horizontal docking well production system and method in permafrost regions to solve the problem of long heating time of the circulating medium in the prior art, resulting in waste of energy, and the possibility of low temperature in the circulating medium. The condensation of water vapor also affects the normal use of the horizontal heating pipeline, thus causing losses to the entire mining equipment
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[0039] The implementation mode of the present invention is illustrated by specific specific examples below, and those who are familiar with this technology can easily understand other advantages and effects of the present invention from the contents disclosed in this description. Obviously, the described embodiments are a part of the present invention. , but not all examples. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the protection scope of the present invention.
[0040] Such as figure 1 and figure 2 As shown, the present invention provides a natural gas hydrate horizontal docking well production system and method in permafrost regions. The horizontal docking well in this embodiment is divided into a horizontal heating pipeline and a vertical collection pipeline. The vertical collection pipeline is first broken by pumping and depressurizing equipment. F...
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The embodiment of the invention discloses a permafrost region natural gas hydrate horizontal butted well exploiting system and method. The method comprises the following steps that a vertical pipelineis lowered in a vertical well section at the middle position of a horizontal butted well, and heating pipelines are inserted in oriented well sections on the two sides of the vertical pipeline; heated natural gas serves as a circulation medium to be pressurized and guided into the heating pipelines; hot natural gas is downwards led to hot gas staying areas of the heating pipelines, and the hot natural gas stays in a hydrate exploiting layer for heat exchange; and cooled natural gas is pumped to a heat increasing box from the hot gas staying areas for reheating, and the heated hot natural gasis downwards pressed again to the hot gas staying areas for cyclic cooling. According to the scheme, a natural gas collecting pipeline and a natural gas cyclic heating pipeline are separated, comparedwith the prior art, the heater work pressure can be reduced, and the heating time is short; and through cyclic natural gas heating, the drying condition can be kept at any time, damage to whole exploiting equipment is low, and long-time exploiting work can be achieved.
Description
technical field [0001] The embodiments of the present invention relate to the technical field of natural gas hydrate exploitation, and in particular to a natural gas hydrate horizontal butt joint well exploitation system and method in permafrost regions. Background technique [0002] According to the development plan and measures of natural gas hydrate and the actual experience of oil and gas development at present, it is proposed to use electric energy as the power, natural gas decomposed in the hole as the circulating medium, depressurization as the main, heating as the auxiliary, unmanned on-site, automatic and manual control It is an economically feasible and environmentally friendly mining solution with integrated remote alarm and monitoring. [0003] According to the characteristics of natural gas hydrate reserves and geological characteristics in the Muli area, submersible pump drainage is used for decompression mining, so that the water layer is kept below the natura...
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IPC IPC(8): E21B43/24E21B43/30E21B17/02
CPCE21B43/24E21B43/305E21B17/028
Inventor 庞守吉张帅肖睿王平康张家政李鑫淼王汉宝张永勤祝有海卢振权高相宇郭俊飞
Owner OIL & GAS SURVEY CGS