Tie-back barrel device capable of rotating into well

Abstract

The invention discloses a tie-back barrel device capable of rotating into a well. The device comprises a torque transfer unit, a dual releasing unit and a tie-back unit. The torque transfer unit is composed of an upward lifting barrel, a sliding barrel, a shearing pin, a spring, slips, a blocking baffle and a tie-back barrel. An inner cavity with the area difference is arranged between the sliding barrel and the upward lifting barrel. A pressure transfer hole is formed in the upward lifting baffle. An annular groove is formed in the outer side of the sliding barrel. The upper portion of the sliding barrel is provided with a retaining mechanism. The dual releasing unit comprises a hydraulic releasing unit body and a mechanical back-off releasing unit body and is composed of a back-off barrel, a ball base, a clamping key, a separation barrel, a sliding sleeve, a pin and a clamping ring. The separation barrel and the upward lifting barrel are connected through a screw. The sliding sleeve is arranged on the external circle portion of the separation barrel. The front portion of the sliding sleeve is provided with a threaded hole and a groove. The back-off barrel and the separation barrel are matched through the clamping key and an inserting key. The tie-back unit comprises a tie-back barrel and an inserting-back barrel. The tie-back barrel device is one completion pipe string component, is connected to an oil pipe or drill rod, and can be used in a direct well or inclined well.

Description

technical field [0001] The invention belongs to the technical field of design and manufacture of drilling and completion tools, and in particular relates to a device that can be transferred into a well connection tube. or in an inclined well. Background technique [0002] At present, in the domestic well completion technology, it is often encountered that the completion string is blocked. At this time, it can only be solved by the completion fluid circulation and the lifting and lowering of the string. In many cases, these two methods are not ideal. For wells with complex well conditions, this not only increases the risk of well control, but also prolongs the construction period and consumes unnecessary manpower and material resources. Contents of the invention [0003] The purpose of the present invention is to provide a tie-back barrel device that can be released by means of completion fluid circulation, lifting and lowering, and rotation, and has dual mechanical and hy...

AI Technical Summary

Problems solved by technology

[0002] At present, in the domestic well completion technology, it is often encountered that the completion string is blocked. At this time, it can only be solved by the completion fluid circulation and the lifting and lowering of the string. In many cases, these two methods are not ideal. For wells with complex well conditions, this not only increases the risk of well control, but also prolongs the construction period and consumes unnecessary manpower and material resources.

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