A kind of Christmas tree device and method for exploiting natural gas hydrate
A technology for Christmas tree and natural gas, applied in the fields of fluid extraction, earth-moving drilling, wellbore/well components, etc., can solve problems such as blockage of pipelines, and achieve the effect of improving safety
Active Publication Date: 2020-05-01
CHINA UNIV OF PETROLEUM (BEIJING)
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Problems solved by technology
[0003] In view of the above problems, the object of the present invention is to provide a Christmas tree device and method for exploiting natural gas hydrates, so as to solve the two major problems of flooding of natural gas hydrate gas production wells and secondary generation of hydrates in pipelines to block pipelines in the conventional production process. Production obstacles
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[0020] The present invention will be described in detail below in conjunction with the accompanying drawings and embodiments. However, it should be understood that the accompanying drawings are provided only for better understanding of the present invention, and they should not be construed as limiting the present invention.
[0021] Such as figure 1 As shown, the Christmas tree device provided by the present invention includes a tubing 1 , a casing 2 , a tubing hanger 3 , a liquid phase outlet 4 , a gas phase outlet 5 , an electric submersible pump 6 and a heating device 7 . The casing 2 is sleeved on the outside of the oil pipe 1 , and there is an oil casing annulus 8 between the casing 2 and the oil pipe 1 . The upper end of the oil pipe 1 is inserted into the oil pipe hanger 3 , and the oil pipe hanger 3 is used to support the oil pipe 1 and seal the oil jacket annulus 8 . The liquid phase outlet 4 communicates with the oil pipe 1 through the main valve 9 on the pumping ...
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The invention relates to a Christmas tree device and method for natural gas hydrate extraction. The Christmas tree device comprises an oil pipe, a sleeve, an oil pipe hanger, a liquid phase outlet, agas phase outlet, an electric submersible pump and a heating device. The oil pipe is sleeved with the sleeve, and an oil sleeve annulus is formed between the sleeve and the oil pipe; the upper end ofthe oil pipe is inserted in the oil pipe hanger, the liquid phase outlet communicates with the oil pipe through a water pumping pipeline side main valve, and the gas phase outlet communicates with theoil sleeve annulus through a gas extracting pipeline side main valve; the electric submersible pump is arranged at the tail end of the oil pipe and communicates with the oil pipe; and the heating device is arranged on the lower portion of the electric submersible pump. The breakthrough innovation modes of oil pipe water pumping and annulus gas extraction are adopted for extraction, gas and waterare separated at the hole bottom, thus the risk that when a gas phase and a water phase flow in a same channel, a hydrate is generated again to block a shaft and a Christmas tree is effectively avoided, and the extraction safety is improved; and meanwhile the situations that in the mixed delivering process of the gas phase and the water phase, under the effect of gravity, the large amount of wateris gathered at the hole bottom, consequently, a gas well is flooded, and normal production is affected are effectively avoided.
Description
technical field [0001] The invention relates to a natural gas hydrate exploitation equipment and method, in particular to a Christmas tree device and method for exploiting natural gas hydrate. Background technique [0002] At present, in the development of deep-water gas hydrates, only the depressurization method has obtained a certain degree of industrial verification. In single well production, the hydrate in the reservoir decompresses to produce natural gas and liquid water. For conventional oil and gas reservoirs, the production process is generally to extract the oil-gas-water three-phase fluid collected in the wellbore to the surface through formation pressure or artificial lift, and then carry out oil-gas-water phase separation and subsequent processing; When natural gas hydrate is exploited by depressurization method, it generally accumulates in formations at a depth of tens of meters to hundreds of meters from the seabed surface. Natural gas hydrate decomposes in t...
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IPC IPC(8): E21B43/01E21B43/24E21B43/22
CPCE21B41/0099E21B43/01E21B43/16E21B43/2401
Inventor 冯军凯赵天奉张皓林方坚
Owner CHINA UNIV OF PETROLEUM (BEIJING)