Seat seal mechanism used for packing type tail pipe hanger

Abstract

The invention provides a sealing mechanism used for a packer type liner hanger, which comprises a feeding tool, a sealing shell 23, a tie-back cylinder 4, a packer and the like, wherein the sealing shell 23 is provided with a plurality of through holes and internally provided with a safety chock block 24; and the inner wall of the tie-back cylinder 4 is provided with an annular shallow groove 44 on the position corresponding to the safety chock block 24. When a back-off nut 21 in the feeding tool is tightened with the sealing shell 23, one end of the safety chock block 24 is squashed into the annular shallow groove 44, so that the feeding tool, the sealing shell 23 and the tie-back cylinder 4 are connected into a whole through the safety chock block 24 to prevent the advanced sealing in the process of running a liner. A sealing short node 6 in the feeding tool and the outside of a sealing sleeve 11 are sleeved with a protecting hydraulic cylinder 10, and a sealing chock block 12 is protected in the protecting hydraulic cylinder so as to prevent that the sealing chock block is accidentally ejected out and sealed in advance in the process of lifting the feeding tool after loosing backing off, to prevent the sealing chock block from scratching the inner wall of the tie-back cylinder at the same time, and to solve the problem existing during sealing the packer in the prior art.

Description

technical field [0001] The present invention relates to a sealing mechanism for an isolated liner hanger, and more particularly to a sealing mechanism for liner cementing in highly deviated wells, extended-reach wells, horizontal wells and ultra-deep wells. The seat seal mechanism used in conjunction with the compartment liner hanger. Background technique [0002] In the liner cementing operations of ultra-deep wells, highly deviated wells, horizontal wells, and extended-reach wells, due to factors such as too long drilling tools, non-centered liner strings, large inclination angles, and resistance, etc., often As a result, the packer on the top of the hanger was set in advance, so that the cementing operation could not be normal, and at the same time, it was costly to deal with such accidents. [0003] At present, for the packer on the top of the hanger, the setting method is to apply a downward axial load to the tie-back through the setting stopper on the setting joint of...

AI Technical Summary

Problems solved by technology

[0004] In order to solve the problems such as early setting of the isolated hanger, the inventor designed and developed a new type of isolated hanger setting mechanism suitable for ultra-deep wells, highly inclined wells, and extended-reach wells.

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