Pile shoe structure for retractable drilling platforms

Abstract

The invention discloses a pile shoe structure for retractable drilling platforms. The structure comprises a top sealing plate, a bottom sealing plate, a retractable steel skeleton, a movable shoe side-wall shell and a hydraulic device, wherein the top sealing plate is an upper foxed plate arranged below a pile leg, and the bottom sealing plate is a lower fixed plate which is arranged at the lower part of a pile shoe and formed into a pile tip of the pile shoe; the steel skeleton is arranged below the top sealing plate, and in a retractable cage structure consisting of a plurality of steel members; the movable shoe side-wall shell can cooperate with the retractable formation of the steel skeleton of the pole shoe so as to increase the pressure bearing area of the pile shoe and prevent soil bodies around the pile shoe from entering the pile shoe; and a control system of the hydraulic device is arranged at a ballasting control center of a platform, and used for transmitting a shoe retraction instruction to the hydraulic device through hydraulic pipelines laid along the pile leg, then realizing the automatic retraction of the steel skeleton through cooperating with the ballasting control of the platform. By using the pile shoe structure disclosed by the invention, the problem of puncturing existing in the process of carrying out pile driving on a self-elevating drilling platform and the problem of difficult pile extracting existing in the process of withdrawing the self-elevating drilling platform are solved.

Description

technical field [0001] The invention relates to technologies related to oil exploitation, in particular to a retractable drilling platform spud shoe applied to the pile leg structure of a jack-up drilling platform. Background technique [0002] In pile leg structures whose bearing capacity is dominated by pile tip resistance (such as truss structure legs), spud cans with a large cross-sectional area are widely used at the bottom of the pile legs to increase the pile tip resistance and ensure that the pile The requirements of the ultimate bearing capacity of the legs. The frictional resistance of the pile side increases continuously with the increase of the depth of the pile into the mud (theoretically, it is the accumulation of segmental integrals), and there is no risk of piercing. The pile tip resistance is different from the pile side friction resistance. The pile tip resistance depends on the stratum corresponding to the depth of the spud can. With the layered distribut...

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Problems solved by technology

[0005] The technical problem to be solved by the present invention is to provide a retractable drilling platform pile shoe structure to solve the problems existing in the operation process of the jack-up drilling platform in view of the deficiency of the existing jack-up drilling platform plugging pile prediction technology. Risk of wear and difficulty in pulling piles

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