Anti-icing conductor tube composite structure

Abstract

The invention discloses an anti-icing conductor tube composite structure. The anti-icing conductor tube composite structure comprises a surface casing and an outer layer conductor tube as well as an inner layer conductor tube; wherein the outer layer conductor tube is arranged outside the surface casing, the inner layer conductor tube is arranged between the outer layer conductor tube and the surface casing corresponding to ice region, the length of the inner layer conductor tube is less than the length of the outer layer conductor tube and is more than the thickness of the ice region, the thickness of the outer layer conductor tube is locally increased at the ice region, and annular part between the outer layer conductor tube and the inner layer conductor tube and the annular part between the inner layer conductor tube and the surface casing are all solidified by cement pouring. In the invention, the inner layer conductor tube and the surface casing are fixedly connected, the defect that the hammering-in depth of the inner layer conductor tube is difficult to control is avoided, and meanwhile material utilization amount is reduced, and flexural rigidity of local conductor tube inice region is improved. The invention can effectively improve the anti-icing capacity of conductor tube, has no influence on drilling construction period and can save a lot of project expenses.

Description

technical field [0001] The invention relates to offshore petroleum engineering equipment, in particular to an ice-resistant and water-resistant casing composite structure used for anti-icing of offshore drilling water-resistant casings. Background technique [0002] For offshore drilling, water-resistant casing is an essential and important drilling equipment. In winter, due to the sea ice coverage, the ice area has a large span and ice force, and the lateral force on the surface water-resistant casing is large. Therefore, the anti-ice ability of the surface water-resistant casing plays an important role in the safe operation of offshore drilling in winter. At present, the conventional methods to improve the anti-icing ability of the surface water riser are: [0003] 1. Adopt double-layer water riser casing structure, such as figure 1 As shown, that is, the outer layer adopts the outer layer water-resistant casing 1' with a diameter of 76.2 cm, the inner layer adopts the i...

AI Technical Summary

Problems solved by technology

This type of structure increases the workload of jacket construction and construction, and the construction and operation costs increase greatly

[0005] 3. Adopt the large-size water-resisting casing structure to improve the anti-icing ability of the water-resisting casing. This type of structure will increase the steel consumption of the water-resisting casing, which will greatly increase the operating cost of the water-resisting casing.

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