A combustible ice mining pipe string heated by formation energy and its operation method

Abstract

The invention discloses a combustible ice mining pipe string heated by formation energy and an operation method thereof, including a separation gas oil pipe, a separation liquid oil pipe, a liquid flow converter, a liquid flow bypass pipeline, an ESP packer, and a sand control packer , filling pump system, first dispenser, second dispenser and third dispenser; the invention realizes the heating of the water body during the mining process by setting up the combustible ice mining pipe string by utilizing the formation energy heating, preventing hydration The secondary formation of the hydrate and the thermal drive and temperature increase of the hydrate production layer that does not move the pipe column saves the heating energy consumption. The ratio adjustment of geothermal water and hydrate is realized through the adjustable generator, so as to realize the control of production temperature. The designed liquid flow converter realizes the diversion and diversion of the separated gas and the produced liquid, which is convenient for fluid control inside the string.

Description

technical field [0001] The invention belongs to the technical field of combustible ice exploitation, and in particular relates to a combustible ice exploitation pipe string and an operation method thereof heated by formation energy. Background technique [0002] In the mining process of combustible ice, there are mainly pressure reduction method, thermal shock method, chemical injection method, etc. Among them, the depressurization method promotes the decomposition of combustible ice by reducing the pressure of the reservoir, and extracts the liquid water in the reservoir or the free gas at the bottom, which reduces the formation pressure and promotes the decomposition of combustible ice. It is the main method of hydrate test production. [0003] The depressurization method realizes the separation of natural gas and water in the underground. When the natural gas is lifted to the surface, as the pressure in the wellbore increases, hydrate may be formed again, which will block...

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Problems solved by technology

[0004] The patent application number 201710027757 proposes a laboratory instrument that uses electromagnetic induction to decompose natural gas hydrate, which cannot meet the large-scale industrial mining of combustible ice

The application number is 201910128714.3. An electromagnetic heating device for seabed combustible ice mining needs to use ground energy for electromagnetic heating, which consumes a lot of power and has no obvious energy-saving effect.

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