Combustible ice exploitation tubular column utilizing stratum energy heating and operation method of combustible ice exploitation tubular column

Abstract

The invention discloses a combustible ice exploitation tubular column utilizing stratum energy heating and an operation method of the combustible ice exploitation tubular column. The tubular column comprises a separation gas oil pipe, a separation liquid oil pipe, a liquid flow converter, a liquid flow bypass pipeline, an ESP packer, a sand prevention packer, a filling pump system, a first bottom-hole regulator, a second bottom-hole regulator and a third bottom-hole regulator. According to the combustible ice exploitation tubular column utilizing stratum energy heating, water heating in the exploitation process is achieved, secondary formation of hydrates and thermal drive warming of a hydrate exploitation layer without tubular column movement are prevented, and the heating energy consumption is reduced; the proportional adjustment of geothermal water and the hydrates is achieved through the adjustable bottom-hole regulators, and therefore the exploitation temperature control is achieved; and the designed liquid flow converter realizes steering diverting of separated gas and exploited liquid, and the fluid control in the tubular column is convenient.

Description

technical field [0001] The invention belongs to the technical field of combustible ice mining, and in particular relates to a combustible ice mining string heated by formation energy and an operation method thereof. Background technique [0002] In the mining process of combustible ice, there are mainly depressurization methods, thermal intensification methods, and chemical agent injection methods. Among them, the depressurization method is to promote the decomposition of combustible ice by reducing the reservoir pressure, and pump out the liquid water in the reservoir or the free gas at the bottom, resulting in a decrease in formation pressure and the decomposition of combustible ice. It is currently the main method for hydrate test production. [0003] The depressurization method achieves 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, hydrates may be formed again, which w...

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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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