Suction anchor applied to deepwater and shallow drilling engineering and mounting method thereof

Abstract

The invention discloses a suction anchor applied to deepwater and shallow drilling engineering and a mounting method thereof. The suction anchor comprises a suction anchor outer cylinder, wherein thesuction anchor outer cylinder is sealed at the top and opened at the bottom; a top plate is arranged at the top of the suction anchor outer cylinder; a central hole is formed in the center of the topplate; a guiding pipe is connected with the bottom of the top plate; a suction anchor inner cylinder is inserted in the central hole; a prefabricated guide pipe which can be pre-bent is mounted in thesuction anchor inner cylinder; and at least one suction pump port for connecting a suction pump and a level for detecting the perpendicularity degree of the suction anchor are arranged on the top plate. According to the suction anchor, the central hole is formed to enable the suction anchor inner cylinder to be inserted in; the suction anchor inner cylinder is arranged to greatly improve the transverse stability and the vertical stability of the suction anchor; the prefabricated guide pipe which can be pre-bent is mounted in the suction anchor inner cylinder to effectively reduce the deflecting depth, so that the requirements of the stability and the deflecting depth of a well mouth from the deepwater and shallow drilling engineering are adapted to ensure drilling.

Description

technical field [0001] The invention relates to an installation device and an installation method thereof, in particular to a suction anchor and an installation method thereof used in deep-water shallow drilling engineering. Background technique [0002] For offshore drilling projects, deepwater drilling technology is recognized as a difficult point in the industry. In deepwater drilling projects, the requirements for wellhead stability are very high, and maintaining the stability of the wellhead is the primary condition for continuous drilling, successful drilling and reducing downhole complex situations. [0003] At present, for deepwater drilling projects, the technology of jetting down the surface conduit is often used in China to maintain the stability of the wellhead. Usually, the bearing capacity of the conduit is adjusted by adjusting the depth of the conduit into the mud. When reaching the shallow target point, the kickoff point of the wellbore trajectory is requir...

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Problems solved by technology

[0003] At present, for deepwater drilling projects, the technology of jetting down the surface conduit is often used in China to maintain the stability of the wellhead. Usually, the bearing capacity of the conduit is adjusted by adjusting the depth of the conduit into the mud. When reaching the shallow target point, the kickoff point of the wellbore trajectory is required to be shallow, and at the same time, the mud entry depth of the conduit will be reduced accordingly, and the contact area between the conduit and the formation will be reduced. At this time, the bearing capacity of the wellhead will be insufficient. In the

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