Spherical cage type joint flexible drilling tool

Abstract

The invention discloses a ball cage type joint flexible drilling tool which comprises an upper connector, a spline ball head, a ball cage type universal joint, a screw and a lower connector, the spline ball head is installed from the right side of the ball cage type universal joint, the upper connector is connected with the ball cage type universal joint through the screw, and the spline ball head is connected with the lower connector through threads. The ball cage type universal joint is composed of an outer shell, a ball cage, an inner star-shaped frame and balls. Before the ball cage type flexible drilling tool is used, the upper connector and the lower connector are connected in series end to end to form a flexible drilling column. The whipstock has the advantages of being simple and reliable in structure, high in rock debris cleaning capacity, large in whipstock angle, efficient in axial force and torque transmission efficiency and the like, and small-radius whipstock can be achieved in the current drilling process.

Description

technical field [0001] The invention belongs to the field of oil and gas drilling, and in particular relates to a cage-type joint flexible drilling tool. Background technique [0002] As the proportion of recoverable reserves in the newly proven reserves of oil and gas reservoirs gradually decreases, while the reserves of heavy oil, complex small fault blocks, low permeability reservoirs and ultra-low permeability reservoirs are increasing year by year, how to develop heavy oil reservoirs , Tap the remaining oil reservoirs on the top of thick oil layers, local remaining oil reservoirs sealed by faults, and reservoirs with small sand bodies, poor production efficiency and difficult comprehensive adjustment, so as to improve the production degree of reservoirs, increase the output of old oil wells and improve development The effect has become an urgent task to be solved in various oil fields. In order to alleviate the imbalance between storage and production and improve the r...

AI Technical Summary

Problems solved by technology

In order to alleviate the imbalance between storage and production and improve the relationship between injection and production, the ultra-short radius sidetracking horizontal well technology is a new technology to develop and tap the remaining oil fields. Through this technology, sidetracking is directly carried out in the original well casing. It is different from conventional The most obvious difference between horizontal wells is that the radius of curvature is very small, generally not greater than 4m, while the radius of curvature of conventional drilling is relatively large, so conventional drilling tools cannot meet this requirement

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