Suction anchor type surface layer well building device suitable for deep water natural gas hydrate exploitation

Abstract

The invention discloses a suction anchor type surface layer well building device suitable for deep water natural gas hydrate exploitation. The suction anchor type surface layer well building device comprises a suction anchor type guide pipe top cover, a suction anchor outer cylinder, an inner guide pipe, a soil plug prevention functional rib plate, a supporting rib plate and a recoverable conicalguide pipe plug. The suction anchor type guide pipe top cover, the suction anchor outer cylinder and the inner guide pipe are combined to form a suction anchor type guide pipe basic form; the recoverable conical guide pipe plug consists of a conical guide pipe plug and a telescopic fixing device. The suction anchor type surface layer well building technology can be realized by combining the suction anchor installation technology with a guide pipe, the conventional surface layer well construction jetting down-flowing guide pipe technology is replaced, the bearing capacity of a wellhead system is greatly improved, the suction anchor type surface layer well building device is suitable for deep water natural gas hydrate exploitation, meanwhile, the earth plug phenomenon frequently encounteredin suction anchor installation is avoided, and the guide pipe is internally clean and free of mud after installation.

Description

technical field [0001] The invention relates to a suction anchor type surface layer well construction device suitable for deep-water natural gas hydrate exploitation and an installation method thereof, belonging to the technical field of deep-water natural gas hydrate exploitation and operation technology. Background technique [0002] At present, domestic deepwater surface wells are mainly constructed by jetting down conduit. This technology has a single operation mode, high geological requirements, small bearing capacity, low operating safety factor, and requires additional supporting force provided by the surface casing; the ability to respond to shallow geological disasters is poor, and the operation control requirements are high. However, the longitudinal stability of the gas hydrate test production wellhead has a greater risk, and the risk of subsidence is prone to occur. The reason is that the buried depth of the hydrate-enriched layer is relatively shallow, usually ...

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Problems solved by technology

[0004] The invention provides a suction-anchor surface well construction device suitable for deep-water natural gas hydrate exploitation. The suction anchor technology is combined with a conduit to form a suction-anchor surface well construction device, which greatly improves the carrying capacity of the conduit and can replace conventional surface well construction. The technology of jetting down into the conduit realizes the suction anchor surface well construction technology, avoids the soil plug phenomenon often encountered during the installation of the suction anchor, and realizes that the conduit is clean and free of mud, which is convenient for subsequent drilling operations, and can solve the problem of conventional gas hydrate production. The problem that the conduit type cannot meet the wellhead stability requirements

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