Combined suction anchor and seabed injecting method thereof

Abstract

The invention discloses a combined suction anchor and a seabed injecting method thereof, and belongs to the technical field of seabed drilling. The combined suction anchor comprises multiple sets of cylinders vertically arranged, and base pipes; the top ends of the cylinders are closed, and the lower ends are opened; exhaust ports and water sucking ports are formed in the top ends of the cylinders; the water sucking ports are connected with a water sucking pump in a hydraulic control system of suction anchor injecting equipment through pipelines; the opening and closing actions of the exhaustports and the water sucking ports in each set of the cylinders are independently controlled by the hydraulic control system; the two adjacent sets of the cylinders are connected through outer side ribplates in a welding mode; annular structures opened at the upper and lower ends are surrounded by the cylinders and the outer side rib plates; the base pipes are arranged in the cylinders and / or theannular structures; and the two adjacent sets of the base pipes and the base pipes, the side walls of the cylinders and the outer side rib plates are connected through inner side rib plates in a welding mode. Through innovative design of the combined suction anchor and the seabed injecting method thereof, the purpose of improving the deep sea well mouth stability is achieved.

Description

Technical field [0001] The invention relates to a suction anchor and its seabed penetration method, in particular to a combined suction anchor and its seabed penetration method. Background technique [0002] In subsea drilling engineering, suction anchor is a subsea pile foundation developed to solve the problem of subsea soft foundation bearing and enhance wellhead stability. Its specific structure is: a cylinder with a closed top and an open lower end is provided on the outside. The top of the body is provided with a water suction port, which is connected with the suction pump through a pipeline. When the suction anchor cylinder penetrates into the seabed, the suction pump can be used to draw seawater out of the cylinder, and the pressure difference between the cylinder body and the outside makes it penetrate into the seabed mud layer. With the development of marine engineering technology, the above-mentioned cylindrical suction anchors are widely used in offshore wind power f...

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Problems solved by technology

[0003] In the prior art, most of the suction anchors used as the stable base of the seabed wellhead adopt a single-tube structure. Due to the complex topographic structure of the seabed, it is difficult for the suction anchor with a single-tube structure to provide sufficient stable support when the seabed foundation is soft. Therefore, it is necessary to optimize the design of a combined suction anchor that can improve the stability of the deep sea wellhead, and create a construction method suitable for the combined suction anchor to penetrate the seabed

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