Feeding-in tool for surface guide tube during deepwater drilling

Abstract

The invention belongs to the field of ocean oil and gas drilling, and particularly relates to a feeding-in tool for a surface guide tube during deepwater drilling. The feeding-in tool for the surface guide tube during deepwater drilling is used for feeding the guide tube in place, and then a drill rod can be released to continue drilling. The feeding-in tool for the surface guide tube during deepwater drilling comprises a mandrel, an inner sleeve, an outer sleeve and a body, wherein the inner sleeve, the outer sleeve and the body are sequentially arranged outside the mandrel; the inner sleeve can slide vertically relative to the mandrel but cannot rotate; the outer sleeve is connected with the inner sleeve through a transmission thread pair; the body is seated on the inner sleeve; a locking claw penetrates in the body and can slide horizontally along the radial direction; and an anti-rotating pin penetrates in the body and the outer sleeve so that the outer sleeve only can move vertically in the body but cannot rotate. By the feeding-in tool, a drilling tool can be separated from the guide tube and then continues second section drilling, drilling fluid with rock wastes can be discharged from the side direction, the circumstances that the rock wastes are accumulated nearby a wellhead and observation of an indicating bar is stopped are avoided, an effective supporting force can be provided for the body of the tool, and an effect of preventing the feeding-in tool and a guiding tube head from rotating is achieved.

Description

technical field [0001] The invention belongs to the field of offshore oil and gas drilling, and in particular relates to a tool for sending in a surface conduit during deepwater drilling, which is used to send the conduit into place and continue drilling with a drill pipe that can be released. Background technique [0002] In offshore deepwater drilling, the surface conduit is the first layer of casing installed during the construction of the entire deepwater oil well, and it provides structural support for all subsequent casings and wellhead equipment. Running the surface conduit by jetting down the conduit has the advantages of saving drilling time, eliminating the need for cementing and protecting the formation, and its operation requires efficient and reliable running tools. [0003] At present, the research on the surface conduit feeding tool for deepwater drilling in my country is still in its infancy. Most of the operators of the jet down conduit technology used in de...

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Problems solved by technology

[0003] At present, the research on the surface conduit feeding tool for deepwater drilling in my country is still in its infancy. Most of the operators of the jet down conduit technology used in deepwater drilling in the South China Sea are foreign oil companies. They only provide on-site services and do not disclose the technology and sales products to the public. tools, its key parts and core data are kept secret, and the operating costs are high, so it has brought many difficulties to deepwater drilling operations in our country

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