Well completion pipe column

Abstract

The invention discloses a well completion pipe column. The well completion pipe column comprises a sleeve, two floating couplings are arranged on the horizontal segment of the sleeve, the floating couplings comprise shells, upper sliding sleeves and lower sliding sleeves, the upper sliding sleeves are composed of communication parts and shearing parts, the shearing parts are supported by the uppersegments of the inner walls of the shells through upper shearing nails, the lower sliding sleeves are supported by the lower segments of the inner walls of the shells through lower shearing nails, the communication parts are placed in the lower sliding sleeves, and drainage holes are formed in the communication parts; annular steady flow grooves are formed in the upper end surfaces of the shearing parts, and the widths of the steady flow grooves decrease upwards and progressively in the axial directions of the shearing parts. By additionally arranging the multiple floating couplings on the sleeve, the sleeve is always filled with air, due to the fact that the segment, below the floating couplings, of the sleeve is filled with the air, after the segment of the sleeve enters the horizontalwell segment, gravity on the horizontal well wall decreases, then friction force between the sleeve and the well wall decreases, and push force for pushing the sleeve to advance also decreases, so that the well completion pipe column is beneficial for improving the well cementing quality of the horizontal segment and is beneficial for the sleeve to be run to a designed position.

Description

technical field [0001] The invention relates to the field of oil exploitation, in particular to a completion pipe string. Background technique [0002] The completion of extended-reach horizontal wells is characterized by high inclination, long open hole, and long section of stabilizing well. In the case of high inclination angle, the casing string is close to the lower well wall. After entering the horizontal section, the casing string will be completely attached On the lower well wall, the contact section between the casing string and the formation is very long at this time, and the casing string is loaded on the horizontal section of the well wall. The friction resistance of the formation to the casing string is quite large, and it cannot even go down to the bottom of the well by its own weight. , It needs to be pressurized to slide down, and it is easy to cause the casing string to buckle, and it may even cause the casing string to be stuck in the curved section of the w...

AI Technical Summary

Problems solved by technology

[0002] The completion of extended-reach horizontal wells is characterized by high inclination, long open hole, and long section of stabilizing well. In the case of high inclination angle, the casing string is close to the lower well wall. After entering the horizontal section, the casing string will be completely attached On the lower well wall, the contact section between the casing string and the formation is very long at this time, and the casing string is loaded on the horizontal section of the well wall. The friction resistance of the formation to the casing string is quite large, and it cannot even go down to the bottom of the well by its own weight. , it needs to be pressurized to slide down, and it is easy to cause the casing string to buckle, and it may even cause the casing string to be stuck in the curved section of the wellbore due to the high rigidity of the casing and cannot be run in

Due to the high frictional resistance of the casing string, the casing string often cannot go down to the predetermined position smoothly, delaying the construction progress, affecting the subsequent oil recovery effect, and even causing serious consequences of wellbore scrapping

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