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Nitrogen and carbon dioxide mixed gas jet device in horizontal well and mining method

A carbon dioxide and jet device technology, which is applied in the fields of fluid production, earth-moving drilling, wellbore/well components, etc., can solve the problems of unsatisfactory gas production and gas production cycle of a single well, and cannot achieve commercial production, and achieves practicability. The effect of strong, unobstructed passage and improved efficiency

Pending Publication Date: 2022-04-12
GUANGZHOU INST OF ENERGY CONVERSION - CHINESE ACAD OF SCI
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Problems solved by technology

Among these test production plans, except for the gas hydrate test production in China in 2017, in order to further improve the permeability of the reservoir and increase the production capacity, the near-wellbore reservoir stimulation method was adopted, and the existing international field production test No reservoir stimulation has been carried out. As a result, the single well gas production and gas production cycle obtained in the test production are far from ideal, which cannot meet the requirements of commercial production at all.

Method used

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  • Nitrogen and carbon dioxide mixed gas jet device in horizontal well and mining method
  • Nitrogen and carbon dioxide mixed gas jet device in horizontal well and mining method
  • Nitrogen and carbon dioxide mixed gas jet device in horizontal well and mining method

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Embodiment

[0033] It should be noted that the terms "first" and "second" in the description and claims of the present invention and the above drawings are used to distinguish similar objects, but not necessarily used to describe a specific sequence or sequence. It is to be understood that the data so used are interchangeable under appropriate circumstances such that the embodiments of the invention described herein can be practiced in sequences other than those illustrated or described herein. In addition, the terms "comprising" and "having" and any variations thereof in the embodiments of the present invention are intended to cover a non-exclusive inclusion, for example, a process, method, system, product or device comprising a series of steps or units is not necessarily limited to Those steps or elements are not explicitly listed, but may include other steps or elements not explicitly listed or inherent to the process, method, product or apparatus.

[0034] It is to be understood that ...

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Abstract

The invention discloses a nitrogen and carbon dioxide mixed gas jet device in a horizontal well and an exploitation method, and relates to the technical field of energy exploitation, the nitrogen and carbon dioxide mixed gas jet device in the horizontal well comprises an offshore platform, a natural gas processing unit and a pressurizing unit, a gas injection horizontal well is arranged on a hydrate layer of a gas exploitation pipe, and a mixed gas jet unit and a nozzle assembly are arranged in the gas injection horizontal well; the mixed gas jet unit is used for mixing nitrogen and carbon dioxide and then dispersedly injecting the nitrogen and the carbon dioxide into a hydrate deposition layer of a hydrate layer through a nozzle assembly, and methane gas of the hydrate deposition layer is replaced by mixed gas of the nitrogen and the carbon dioxide; the gas production horizontal well is used for collecting methane gas and conveying the methane gas to the natural gas treatment unit. Gap injection of mixed gas can be achieved, smoothness of a replacement gas channel is guaranteed, and the efficiency of replacing methane with carbon dioxide is improved.

Description

technical field [0001] The invention relates to the technical field of energy exploitation, in particular to a nitrogen-carbon dioxide mixed gas jet device and an exploitation method in a horizontal well. Background technique [0002] Gas hydrate is a crystalline substance formed by natural gas and water under low temperature and high pressure. It looks like ice and is flammable. It is commonly known as "combustible ice". It exists widely in permafrost and seabeds. It is estimated that the carbon content in natural gas hydrate is twice the total carbon content of other fossil energy sources, and it is a potential energy resource. [0003] Most of the current gas hydrate recovery technologies are in the laboratory research stage, and only a few have been applied to hydrate test production, such as the fluid extraction method of the China Geological Survey and the gas hydrate solid fluidization test production plan of CNOOC. Among these test production plans, except for the g...

Claims

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Application Information

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IPC IPC(8): E21B43/16E21B41/00
CPCY02P90/70E21B43/16E21B41/00
Inventor 李栋梁李祥卢富勤梁德青周雪冰卢静生
Owner GUANGZHOU INST OF ENERGY CONVERSION - CHINESE ACAD OF SCI
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