Installing and guiding system of propping-tensioning vertical pipe and using and recovery methods thereof

Abstract

The invention discloses an installing and guiding system of a propping-tensioning vertical pipe as well as a using method and a recovery method thereof. The system comprises a guide frame and a temporary guide base; the guide frame comprises a tripping-in construction member and a guide sleeve, and the left side and the right side of the tripping-in construction member are fixedly connected with the guide sleeve through a transverse connecting rod; two hoisting rings are welded on the temporary guide base; pushing switches are symmetrically arranged close to the two end parts of the temporary guide base close; guide pile legs are arranged below the pushing switches; and the guide pile legs of the temporary guide base can be inserted into guide jacks of a wellhead chassis and are locked with the wellhead chassis. In the invention, during the installing process, the propping-tensioning vertical pipe can be accurately butt-jointed with a seabed wellhead smoothly, and other vertical pipes are not influenced; and after the installation of TTR (Target-Tracking Radar) vertical bars is completed, an installing and guiding device can be recovered to be used for the installation of a next well. A guide rope of the temporary guide base is used for recovery, and an additional winch mooring rope device is not needed.

Description

technical field [0001] The invention relates to an auxiliary installation device for a top-tensioned riser, in particular to an installation guide system for a top-tensioned riser and a use and recovery method thereof. Background technique [0002] Top-tensioned riser, referred to as TTR riser, is a type of riser widely used in the development of deep sea or ultra-deep sea oil and gas fields. It is mainly used in tension leg platforms and Spars platforms, and can be used for drilling, well completion and production. During the installation process of the TTR riser, due to external loads such as waves and ocean currents, the TTR riser will have a lateral offset. Once the lateral offset is too large, the TTR riser will be overstressed, which may cause the TTR riser to fail or Serious consequences such as the inability of the TTR riser to connect with the subsea equipment. [0003] In order to align the TTR riser with the wellhead, the permanent guide base system is usually us...

AI Technical Summary

Problems solved by technology

[0004] 1. Locking the permanent guiding base and the catheter head of the wellhead will lead to complicated procedures for recovering the guiding base; however, if the guiding base is not recovered, a guiding base needs to be installed at each wellhead, which will inevitably increase the size of the wellhead chassis Large, the project investment will also increase accordingly;

[0005] 2. Since the underwater robot needs to shuttle around the guide rope, if the guide rope increases with the increase of the guide base, it is easy to make the guide rope and the control cable of the underwater robot entangled, which increases the risk of underwater robot work

[0006] At present, the installation and guidance method of the tensioned riser on the top of the domestic offshore platform is to install a fixed guide base on each wellhead plate, so this leads to as many guide bases as there are wellheads, because each There are guide ropes on the guide base, so the guide rope will increase with the increase of the guide base, and may cause entanglement between the guide ropes, which will greatly increase the risk of entanglement between the cables and guide ropes of the remote control robot ROV. As a result, the TTR riser cannot be accurately docked with the subsea wellhead; since the guide base of each wellhead cannot be recycled, the investment in equipment is also increased

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