Underwater integrated type system for vertical pipe production and conveying and mounting method thereof

Abstract

The invention discloses an underwater integrated type system for vertical pipe production and conveying and a mounting method thereof. The system comprises a vertical pipe production assembly, a vertical pipe control assembly, a combination pontoon and a mooring device. The combination pontoon comprises an outer-layer pontoon body and inner-layer pontoon bodies, and the inner-layer pontoon bodies are embedded into the outer-layer pontoon body in a sleeved mode. The outer-layer pontoon body is responsible for supplying cable mooring tensile force, and all the inner-layer pontoon bodies are each responsible for supplying top tensile force to a single corresponding rigid production vertical pipe or rigid protection pipe, so that vertical stress and motion decoupling of the mooring device and all the vertical pipes are achieved, stress and motion decoupling between all the vertical pipes are also improved, and the requirement of in-place performance of the rigid production vertical pipes is improved. According to the underwater integrated type system for vertical pipe production and conveying and the mounting method thereof, a lower-section pipe cable of a flexible control pipe cable is uniformly integrated and assembled in the rigid protection pipe, and thus the problem of complex galloping damage is avoided; and the inner-layer pontoon bodies can freely rise and fall along the outer-layer pontoon body, and thus the thermal expansion requirement of the rigid production vertical pipes is met.

Description

technical field [0001] The invention relates to a dry oil production platform in the technical field of offshore oil and gas development, in particular to a production standpipe system and an installation method thereof applied to a dry oil production platform in an ultra-deep water environment. Background technique [0002] At present, there are two types of dry oil production platforms suitable for deep sea oil and gas development: TLP platform and Spar platform. The suitable production riser system for dry oil production platforms is the Top Tensioned Riser (TTR for short). The current structure of TTR adopts double-layer casing riser (outer protection pipe, inner protection pipe and production delivery pipe) or single-layer casing riser (outer protection pipe and production delivery pipe). The main function of the casing is to prevent the imbalance of marine environment pollution and pressure integrity caused by the leakage of the production pipeline. Since the weight ...

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Problems solved by technology

[0004] 1. The production and transportation riser is affected by disastrous marine environment elements (strong wind, huge waves and strong sea currents), and the production and transportation riser is prone to interference, wave-induced fatigue damage and VIV fatigue damage, etc., which in turn leads to the rupture of the production and transportation riser and oil spills;

[0005] 2. The absence of the outer protective tube and the inner protective tube leads to a great reduction in the axial stiffness of the production delivery pipe. In order to meet the interference requirements of adjacent production delivery risers, it is necessary to increase the top design distance of the production delivery riser. For this reason It is necessary to increase the deck area of ​​the dry oil production platform and increase the main body size of the dry oil production platform;

[0006] 3. Lack of outer protection pipe and inner protection pipe, thermal expansion causes the production delivery pipe to elongate by about 1.2m, so it is necessary to increase the deck height of the dry oil production platform and increase the main body size of the dry oil production platform;

[0007] 4. The absence of the outer protective tube and the inner protective tube leads to no protective channel for the control umbilical cable, and the control umbilical cable must be arranged parallel or wound on the outer edge of the production delivery tube, which in turn leads to the asymmetry of the cross-section of the production delivery tube, which causes Complex galloping damage problems

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