Rotary hydraulic machinery double function expansion type tail pipe hanger

Abstract

A rotatable hydrostatic machine double-function expansion type tail pipe hanger is applied in oil well cementing construction, which is characterized in that the outer wall of the lower end of a feed in connector is connected with a left-hand screw thread of an expansion tube, and the inner wall of the lower end of the feed in connector is connected with a center tube screw. The lower end of the center tube adopts a shear pin which is fixed with a sealing plug. The inner diameter of the sealing plug is 8 to 20mm less than the inner diameter of the center tube. An expanding plug is arranged inring-shaped space between the center tube and the expansion tube, a plug guiding-tube is connected on the lower end of the expansion tube, a screw on the lower end of the plug guiding-tube is connected with a lower connecting pipe, and a catch ring is landed on a shoulder in the lower connecting tube. The diameter of a center hole on the lower portion of the catch ring is less than the outer diameter of the lower end of the sealing plug. At least two spring locking mechanisms are evenly distributed and fixed on the external wall on the lower end of the lower connecting pipe. The invention hasthe advantages that a tail pipe is firmly hung on the inner wall of an annular tube under a well by adopting a fluid pressure or mechanical means. Improving well cementing success rate of the tail pipe to guarantee downhole safety, well cementing quality is improved. The hanger is suitable for a deep well and a horizontal well with big dislocation.

Description

Technical field: [0001] The invention relates to the technical field of petroleum cementing, in particular to a liner hanger for liner cementing, which is a rotatable hydraulic-mechanical double-acting expansion type liner hanger. Background technique: [0002] Liner suspension cementing technology can reduce cementing casing overlap and save casing; reduce cement injection pressure; simplify well structure and solve the cementing problem of deep wells and complex wells. [0003] At present, there are many types of tail pipe hangers. According to different operation methods of hanging the tail pipe, the existing tail pipe hangers are divided into mechanical and hydraulic types. The operating method of the mechanical liner hanger is generally to lift up and down or rotate the hanger to hang the liner on the outer casing. It is characterized by simple operation and time saving, but its structure requires higher downhole conditions. The hydraulic liner hanger relies on hydraulic pre...

AI Technical Summary

Problems solved by technology

And to overcome the slip-type liner hanger that uses slips to hang, the seat is unreliable, and the diameter becomes smaller after the seat is hung; to overcome the expansion-type liner hanger that expands the expansion tube from top to bottom, and the structure is complicated insufficient

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