Mechanical and jet flow combined exploitation method and mechanical and jet flow combined exploitation device for natural gas hydrates in non-stratified rock of shallow strata in seabed

A combined mining and hydrate technology, applied in the fields of fluid production, earthwork drilling, wellbore/well components, etc., can solve the problems of easy collapse of natural gas hydrate layers, low efficiency of broken and fluidized collection, and low strength of sediment structure. , to achieve the effect of enhancing strength, preventing collapse, and increasing the crushing radius

Active Publication Date: 2017-12-08
SOUTHWEST PETROLEUM UNIV
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Problems solved by technology

However, the working radius of jet crushing is small, the mining space is limited, and the backfill particles are easy to be mixed with crushed particles, resulting in low crushing fluidization collection efficiency, low str

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  • Mechanical and jet flow combined exploitation method and mechanical and jet flow combined exploitation device for natural gas hydrates in non-stratified rock of shallow strata in seabed

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Embodiment Construction

[0016] The present invention will be further described below in conjunction with accompanying drawing, protection scope of the present invention is not limited to the following:

[0017] The seabed shallow non-diagenetic natural gas hydrate mechanical jet combined mining method described in the examples of the present invention mainly includes the following steps:

[0018] Step S1: lower the water-resisting conduit 2, the intelligent directional drilling tool 17 drills through the hole, and drives the flexible double-layer pipe 3 to drill downward. When the drilling reaches the working depth, the intelligent directional drilling tool 17 drills horizontally to the predetermined Location;

[0019] Step S2: Pull back the intelligent guiding drilling tool 17, and at the same time unfold the crushing knife arm 7, through the rotation of the knife arm and the jet nozzle 8 at the front end of the knife arm, jointly break the hydrate ore body, and open the rectification device 16 to i...

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Abstract

The invention discloses a mechanical and jet flow combined exploitation method and a mechanical and jet flow combined exploitation device for natural gas hydrates in non-stratified rock of shallow strata in seabed. The mechanical and jet flow combined exploitation method and the mechanical and jet flow combined exploitation device are used for crushing and exploiting the natural gas hydrates in the non-stratified rock of the shallow strata in the seabed in a composition manner. The mechanical and jet flow combined exploitation method includes drilling pilot holes by an intelligent guide drilling tool, unfolding a mechanical crushing cutter arm after the intelligent guide drilling tool reaches preset locations, carrying out rotary cutting and crushing, starting to carry out jet flow crushing by spray nozzles, opening a flow regulating device, isolating recovery regions from goaves, separating hydrates from sediment by a downhole separator, filling the sediment with CO2, realizing effects of curing backfilled particles and backfilling the sediment in an in-situ manner. The mechanical and jet flow combined exploitation method and the mechanical and jet flow combined exploitation device have the advantages that the crushing radiuses and the exploitation spaces can be enlarged; crushed particles and the backfilled particles can be prevented from being mixed with one another; the sediment which is sorted by the downhole separator is filled with the CO2, accordingly, natural gas in the sediment can be displaced, effects of curing agents can be realized, the strength of backfilled layers can be enhanced, and the goaves can be prevented from collapsing.

Description

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Claims

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Application Information

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Owner SOUTHWEST PETROLEUM UNIV
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