A natural gas hydrate cyclone self-rotation gel breaking separation method and separation device
A technology of cyclone separation and separation method, which is applied in the direction of production fluid, earthwork drilling, wellbore/well components, etc., and can solve the problems of affecting separation performance and poor flow followability of large particle size particles
Active Publication Date: 2022-02-15
EAST CHINA UNIV OF SCI & TECH
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[0005] The purpose of the present invention is to provide a method for weakly cemented argillaceous hydrates or silty undiagenetic hydrates which are mostly obtained by coring the seabed natural gas hydrates, using the strong shearing effect of the swirl field to hydrate weakly cemented natural gas Gel breaking and separation of natural gas hydrate, thus obtaining natural gas hydrate, solving the problem of poor flow followability of large particle size particles and affecting separation performance in existing devices
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[0026] The natural gas hydrate cyclone self-rotation gel breaking separation method comprises the following steps:
[0027] The mixed slurry containing natural gas hydrate and sediment enters the separation device from the booster pump through the feed pipe 4 to perform pre-broken cementation of the mixed slurry. The separation device is composed of a cyclone breaking cylinder 1, a cyclone separating cylinder 2, an overflow pipe 3 and a feed pipe 4. The cyclone breaking cylinder 1 is a cylindrical sealing body. There is a cyclone separation cylinder 2, the cyclone separation cylinder 2 is conical and horn-shaped, the taper of the cyclone separation cylinder 2 is 5~15°, and the top of the cyclone separation cylinder 2 is sealed and connected with the inner wall of the top of the cyclone rubber breaking cylinder 1; The bottom of the cyclone separating cylinder 2 extends through the bottom of the cyclone breaking cylinder 1 to the outer end of the cyclone breaking cylinder 1 .
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The invention relates to a natural gas hydrate swirling self-rotation gel breaking separation method and a separation device, which belong to the technical field of seabed natural gas hydrate separation. In the present invention, the gel breaking and separation of the slurry containing natural gas hydrate deposits are realized through a separation device composed of a cyclone gel breaking cylinder and a cyclone separating cylinder. During work, the slurry containing natural gas hydrate deposits enters the cyclone breaker through the feed pipe, and undergoes high-speed rotational motion under the conditions of strong shear flow and collision with the wall surface, overcoming muddy silt and natural gas. The weak cohesion between the hydrate particles can break the cement of the particles under the action of gravity, fluid drag and buoyancy; the mixed slurry after breaking the cement enters the cyclone separation drum through the whirl inlet, and utilizes the centrifugal force generated by the rotation and the Fluid shear force separates muddy silt and natural gas hydrate, which solves the problems of poor flow followability of large-sized particles and affecting separation performance of existing devices.
Description
technical field [0001] The invention relates to a natural gas hydrate swirling self-rotation gel breaking separation method and a separation device, which belong to the technical field of seabed natural gas hydrate separation. Background technique [0002] Natural gas hydrate (NGH), commonly known as "combustible ice", is an ice-state and clathrate compound formed by water and natural gas under high-pressure and low-temperature environmental conditions. NGH is considered to be a new type of green energy that is most likely to replace conventional energy such as coal and oil in the 21st century. In recent years, several gas hydrate production methods have been proposed, such as depressurization method, thermal stimulation method, injection inhibitor method, carbon dioxide replacement method, etc. However, due to the non-diagenetic and weakly cemented and other characteristics, using the above-mentioned mining methods and existing offshore drilling technology and equipment wi...
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IPC IPC(8): E21B43/34
CPCE21B43/34
Inventor 黄渊汪华林杜军俏吴霁薇李诗豪郝明勋常玉龙周守为付强魏纳李海涛何玉发
Owner EAST CHINA UNIV OF SCI & TECH