A vertical well production system and method for natural gas hydrate in permafrost regions
A mining method and technology of natural gas, applied in the direction of mining fluid, earthwork drilling, wellbore/well components, etc., can solve the problems of long depressurization time, slow depressurization efficiency, easy bursting of gas production pipes, etc., and achieve high depressurization production Speed and safety-enhancing effects
Active Publication Date: 2022-06-17
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 vertical well production system and method in permafrost regions to solve the problem of unstable depressurization work, long depressurization time, slow depressurization efficiency, and poor safety during gas production in the prior art , low stability, and the problem that the gas production pipe is easy to burst under the action of internal and external pressure
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[0041]The following specific embodiments are used to illustrate the embodiments of the present invention. Those who are familiar with the technology can easily understand other advantages and effects of the present invention from the contents disclosed in this specification. Obviously, the described embodiments are part of the present invention. , not all examples. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.
[0042] like figure 1 As shown, the present invention provides a system and method for vertical well exploitation of natural gas hydrate in permafrost areas. In this embodiment, in order to improve the depressurization rate of the natural gas hydrate reservoir, and to reduce the energy consumption and depressurization power source of the depressurization In particular, the decompression pipeline is divided i...
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The embodiment of the present invention discloses a natural gas hydrate vertical well exploitation system and method in permafrost regions, including a first-order deep well pressure pipeline placed under the natural gas hydrate stable zone, and a second-order decompression connected to the upper end of the first-order deep well pressure pipeline Pipeline, the free gas or free body below the gas hydrate stable zone is discharged along the first-order deep well pressure pipeline and the second-order decompression pipeline under high pressure to realize the decompression treatment of the natural gas hydrate stable zone; the first-order deep well pressure pipeline It is connected with a gas production pipe, and the lower end of the gas production pipe is provided with a number of evenly distributed gas collection ports, and the gas collection port is equipped with a buffer for relieving the momentum of the decomposed natural gas. ; This scheme uses a small pumping power to achieve a high depressurization production speed and reduce the gas production pressure of the gas collection port of the gas production pipe itself, thereby improving the safety of natural gas collection.
Description
technical field [0001] Embodiments of the present invention relate to the technical field of natural gas hydrate exploitation, in particular to a system and method for natural gas hydrate vertical well exploitation in permafrost regions. Background technique [0002] According to the natural gas hydrate mining plan and measures and the actual experience of oil and gas development, it is proposed that electricity is used as power, and the natural gas decomposed in the hole is used as the circulating medium. All-in-one, an economical and environmentally friendly mining solution for remote alarm monitoring. [0003] According to the natural gas hydrate reserves and geological characteristics in the Muli area, the submersible pump drainage method is used for depressurization mining, so that the water layer is kept below the natural gas hydrate layer, and the hydrate layer is no longer subject to groundwater pressure, 1. Breaking its high pressure 2. After decompression and expl...
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IPC IPC(8): E21B43/00
CPCE21B43/121
Inventor 庞守吉王平康王汉宝张帅肖睿张永勤祝有海卢振权李宽高相宇李锦桥
Owner OIL & GAS SURVEY CGS