Christmas tree lowering guide device of semi-submersible platform

Abstract

A Christmas tree lowering guide device of a semi-submersible platform comprises a sliding rail vertically arranged between a drilling table and a lower trolley of a moon pool area. The sliding rail comprises a head structural component and a tail structural component, and a lower base and an upper base are connected to the tail structural component of the sliding rail from bottom to top in a locating manner. A sliding base capable of sliding up and down in the axial direction of the head structural component is movably connected to the head structural component of the sliding rail. The sliding base and a Christmas tree guide arm or drilling rod guide arm are in locating connection into a whole through a connecting arm, and independent function structural components capable of accompanying and guiding a Christmas tree or drilling rod to be lowered in the vertical direction of the sliding rail are formed. No position between the function structural components is welded, the function structural components are completely demountable, the manufacturing cost is low, and repeated use can be achieved. In the whole Christmas tree lowering process, guide is achieved, the guide bearing capacity is high, and any collision is avoided to the greatest extent. Powerful equipment guarantees are provided for stable Christmas tree lowering, guiding and supporting are provided for Christmas tree lowering, and stable Christmas tree lowering and safety operation of the whole platform are ensured.

Description

technical field [0001] The invention belongs to the technical field of offshore production operation equipment, and relates to a guide tool for lowering a Christmas tree by using a semi-submersible platform, in particular, a guide device for lowering a Christmas tree on a semi-submersible platform. Background technique [0002] The semi-submersible platform has become one of the most important offshore tooling for exploration, drilling, oil production and other production operations in deep sea and far sea due to its advantages such as wide deck space, stable offshore operation, and large variable load. It is an important wellhead control equipment for testing oil (gas) after completion of oil (gas) wells, or when producing oil from gushing wells. [0003] The christmas tree is lowered to the seabed through the drill pipe. During the process of lowering the christmas tree, the entire platform will be affected by the harsh environment such as wind, waves, and air currents at ...

AI Technical Summary

Problems solved by technology

[0005] Since the fixed guide structure will interfere with other operations under the condition of non-decentralized tree, and occupy the deck space for a long time, it is a great waste of limited space;

[0006] However, a single guiding device cannot effectively play a guiding role in the entire lowering space, and it is difficult to be adopted due to the high cost of equipment

Images