A method and device for running casing while drilling in ultra-deep water

Abstract

The invention discloses a method and device for running a casing in ultra-deep water whiling drilling. The device comprises a guide pipe and a low-pressure mouth head connected to the upper end of the guide pipe, wherein a surface layer casing is arranged in the guide pipe, the upper end of the surface layer casing is connected with a high-pressure mouth head, the high-pressure mouth head is connected and fixed to the low-pressure mouth head, a middle-layer technical casing is arranged in the surface layer casing, the upper end of the middle-layer technical casing is connected with a middle-layer casing hanger, the middle-layer casing hanger is located in the high-pressure mouth head and is connected with the outer pipe of a dual-pipe hanger rotating joint through a left-handed thread, meanwhile the inner pipe of the dual-pipe hanger rotating joint is connected with the upper end of a drill tool adapter joint through a pair of thrust bearings, and the lower end of the drill tool adapter joint is connected with an internal drill tool. The device can achieve casing running while borehole drilling and perform well cementation after the designed drilling depth is reached, and further the drilling efficiency is greatly improved.

Description

technical field [0001] The invention relates to a method and device for running casing while drilling in ultra-deep water, and belongs to the technical field of offshore oil field drilling. Background technique [0002] According to the China National Offshore Oil News report on February 26, 2016: CNOOC refers to water depths above 500m as deep water (internationally, 1500 feet = 457m and above are called deep water), and water depths above 1500m are called ultra-deep water (internationally, 3000 feet = 1360.8m) referred to above as ultra-deep water). In the title "my country's Offshore Oil Industry Enters the Ultra-Deep Water Era", it was reported that the Offshore Oil 981 ultra-deepwater semi-submersible drilling platform discovered the Lingshui 18-1 natural gas field in the ultra-deep waters of the South China Sea at a depth of 1688m in December 2015, bringing my country's offshore The level of oil and gas exploration has pushed to an all-time high, which is very encourag...

AI Technical Summary

Problems solved by technology

[0004] In order to solve the technical problem that the existing drilling and casing operations are carried out separately, resulting in low drilling efficiency, the present invention provides a method and device for casing casing while drilling in ultra-deep water, so as to realize drilling while drilling Run the casing and cement the well after reaching the designed drilling depth, thereby greatly improving the drilling efficiency

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