A method for integrally closing cantilever beams of a jack-up drilling platform

Abstract

The invention provides an integral jointing method of a cantilever beam of a self-elevating drilling platform. The method is characterized in that the cantilever beam and a main hull are jointed; a towing position, a supporting point and a clamping point are arranged on the main hull in advance, wherein the supporting point is used for supporting the cantilever beam during drilling, and the clamping point is used for fixing the end part of the cantilever beam; a ballast system in a preset ratio is arranged on the main hull. The method comprises the steps of providing a barge on which a barge ballast system is arranged, and initially aligning and positioning the barge with the main hull; B, launching the cantilever beam to the barge through a slipway; C, accurately aligning and positioning the main hull with the barge; D, sliding the cantilever beam to reach the preset position on the main hull to finish the jointing of the cantilever beam and the main hull, wherein the floating states of the main hull and the barge are gradually adjusted during sliding. With the adoption of the method, the integrity of a cantilever beam module can be ensured, the problem of renting a large floating crane or a shore crane can be solved, and the risk that the pile insertion is failed to cause the failure of integral jointing can be avoided.

Description

technical field [0001] The invention relates to a method for integrally closing a cantilever beam, in particular to a cantilever beam closing process used in the construction process of a cantilever beam type self-elevating drilling platform. Background technique [0002] The jack-up drilling platform is a mobile offshore drilling platform. It generally adopts the cantilever beam drilling method. It can not only drill independently, but also cantilever on the jacket platform to complete the production well. The cantilever beam is the functional module of the jack-up drilling platform. , including cantilever beam 10, derrick 10b, drill floor 10a, drill floor base and other equipment. During its operation, the displacement in the longitudinal direction is completed through the cantilever beam sliding system, and the lateral movement of the wellhead is completed through the drilling floor sliding device or the X-Y type sliding device. [0003] The overall modular construction ...

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Problems solved by technology

[0008] However, pile insertion slip method: when the jack-up platform is inserted, some slight dislocations often occur due to the conditions of the seabed, and the closing gap between the cantilever beam and the main hull is very small. At this time, the cantilever beam and the main hull They are in contact with the berth and the seabed respectively, and their relative positions are not easy to adjust, which may lead to the failure of pile insertion, that is, the risk of failure of the overall closure. At the same time, the functionality of the lifting system and related systems must be ensured before the pile insertion to ensure the smooth completion of the platform insertion. piles and preload

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