Dry-type Christmas tree based ultra-deepwater oil and gas development system and mounting method thereof

Abstract

The invention discloses a dry-type Christmas tree based ultra-deepwater oil and gas development system and a mounting method thereof. The system comprises a water float, underwater wellhead chambers, dry-type Christmas trees, a water manifold device, an upper flexible stand pipe and a floating-type water surface production device, wherein the dry-type Christmas trees and related equipment are mounted in the underwater wellhead chambers; the underwater wellhead chambers are formed in a wellhead of the water float; oil outlet pipelines of the underwater wellhead chambers are connected with the inlet of the water manifold device; the water float is positioned in the position with the depth of 100-400 m under the water, and is moored to a sea bed through tension cables. According to the invention, the underwater dry-type Christmas trees are adopted, and the dry-type Christmas trees and the related equipment are separated from the sea water environment through the underwater wellhead chambers, so that compared with wet-type Christmas trees, influence of marine corrosion and pressure as well as sea bed sludge and marine creatures on the dry-type Christmas trees is avoided; the suitability is strong, the operation is convenient and safe, the maintenance cost is low, and the situation that divers are not needed to perform installation can be realized completely.

Description

technical field [0001] The invention relates to an ultra-deep water oil and gas field development and application technology, in particular to an ultra-deep water oil and gas development system based on a dry Christmas tree and an installation method thereof. Background technique [0002] With the increasing demand for oil and gas resources and the continuous development of offshore oil industry technology, offshore oil exploitation is developing towards ultra-deep water (1500-3000m) and extremely deep water (greater than 3000m). [0003] At present, deepwater oil recovery usually adopts floating oil recovery system or underwater oil recovery system. The Christmas tree is an important part of various oil recovery systems. According to whether the operating environment of the christmas tree is in direct contact with seawater, it can be divided into a dry christmas tree and a wet christmas tree. Dry Christmas trees can be divided into overwater dry Christmas trees and subsea...

AI Technical Summary

Problems solved by technology

[0009] In order to solve the above-mentioned problems existing in the application of the existing Christmas tree technology in the ultra-deep water environment, the present invention will design an ultra-deep water oil and gas development system based on the existing dry Christmas tree and its installation method, so as to reduce the The technical requirements for the surface floating production unit and the underwater riser system when the Christmas tree is applied in the ultra-deep water environment, as well as the strength, compressive performance and airtightness of the wellhead cabin when the existing underwater dry tree is applied in the ultra-deep water environment. and avoid a series of problems encountered in the application of wet trees in ultra-deep water, so as to improve the working capacity of the existing offshore oil production system, and deal with ultra-deep water and ultra-deep water marine environments more safely, economically and effectively challenges

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