Movable wellhead platform for offshore marginal oilfield development and usage method

Abstract

The invention discloses a movable wellhead platform for offshore marginal oilfield development and a use method of the platform. The platform constituently comprises a platform main body and four pile legs, wherein the four pile legs are connected with the platform main body through hydraulic lifting devices; a submarine oil pipeline vertical pipe is arranged along a height direction of one pile leg; the platform main body is provided with fixing winches and positioning anchors which are respectively arranged outside the pile legs; the platform main body is provided with a multi-way valve, a multiphase flowmeter, a water injection manifold, a water injection filter, a wellhead control disk, an industrial switch, an electric submersible pump junction box, a submarine cable junction box, a lifting hydraulic station, an electrical winch, an electrical remote-control gangway ladder, oil and gas production equipment and a wellhead supporting structure; the wellhead supporting structure is connected with a conductor tube; a wellhead Christmas tree is arranged on the upper end of the conductor tube; the lower end of the conductor tube drills into a submarine designated position, and is fixed by utilization of an underwater wellhead template. The movable wellhead platform disclosed by the invention has the advantages that the production requirements of different offshore marginal oilfields in all life cycles can be met, and the platform can be further removed and wetly towed to other oilfields for operation after the current oilfield is abandoned.

Description

technical field [0001] The present invention relates to oilfield construction, and more particularly, the present invention relates to a movable wellhead platform for developing offshore marginal oilfields. Background technique [0002] At present, the unmanned wellhead platforms used in the development of offshore marginal oilfields in my country all adopt the structure of jacket or barrel foundation. During the offshore installation, the platforms of this structure need to use crane ships to carry out offshore installation operations, including offshore Hoisting, piling, pile connection and other operations will lead to an increase in offshore construction costs and an extension of the construction period. [0003] In addition, the jacket-type unmanned platform is a fixed structure. When the oil field is abandoned, it needs to be dismantled and cannot be reused; the barrel-type unmanned platform cannot meet the production needs of oilfields with different water depths due t...

AI Technical Summary

Problems solved by technology

[0002] At present, the unmanned wellhead platforms used in the development of offshore marginal oilfields in my country all adopt the structure of jacket or barrel foundation. During the offshore installation, the platforms of this structure need to use crane ships to carry out offshore installation operations, including offshore Hoisting, piling, pile connection and other operations, resulting in an increase in offshore construction costs and a prolongation of the construction period

[0003] In addition, the jacket-type unmanned platform is a fixed structure. When the oil field is abandoned, it needs to be dismantled and cannot be reused; the barrel-type unmanned platform cannot meet the production needs of oil fields with different water depths due to its poor adaptability to water depth.

It can be seen that the unmanned wellhead platforms of these two structural forms have deficiencies.

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