Flexible short section bearing force through axial elastic long rod body

Abstract

The invention provides a flexible short section bearing force through an axial elastic long rod body. The flexible short section comprises an upper connector, a lower connector, a connecting shaft, a supporting sleeve and an elastic pressure-bearing rod. The upper connector and the lower connector are connected in a hinged mode through the connecting shaft, the supporting sleeve fixedly sleeves the connecting shaft, an arc-shaped guide groove is formed in the outer circumferential face of the supporting sleeve, the elastic pressure-bearing rod is a rod body of an elastic structure, the two ends of the elastic pressure-bearing rod are correspondingly fixed to the upper connector and the lower connector in a limited mode, and the middle of the elastic pressure-bearing rod is in a two-dimensional curve rotation shape and penetrates through the guide groove. The long-rod-shaped elastic pressure-bearing rod serves as the elastic structure rod body of the flexible short section, the elastic pressure-bearing rod is bent under stress to drive the upper connector to deflect relative to the lower connector, and the flexible short section adapts to an inclined bending structure of an oil well. In the drilling or logging process, the flexible short section has the high dynamic automatic reset capacity, the adaptive capacity of the elastic pressure-bearing rod and the borehole bending curvature can be improved, the coordination capacity of the elastic pressure-bearing rod and the borehole bending direction can further be enhanced, the function stability is high, work reliability is good, and meanwhile, good power guidance performance is achieved.

Description

technical field [0001] The invention relates to a flexible short joint, in particular to a flexible short joint supported by an axial elastic long rod body. Background technique [0002] The flexible nipple is a supporting downhole tool used for drilling or logging operations in highly deviated wells and horizontal wells in oil fields. Downhole drilling tools or logging tools are stuck and cause operation accidents; at present, the flexible nipples used in production mainly have two structural forms: ball joint type and multi-link chain type, among which: the ball joint type flexible joint uses ball The matching structure of the head ball sleeve connects the upper and lower joints, and the upper and lower joints are deflected by the action of the wellbore side wall, while the multi-segment chain flexible short joint forms a flexible cylinder through the combination of multi-stage rings, and is constrained by the shape of the wellbore. To make the flexible cylinder bend, bec...

AI Technical Summary

Problems solved by technology

[0002] The flexible nipple is a supporting downhole tool used for drilling or logging operations in highly deviated wells and horizontal wells in oil fields. Downhole drilling tools or logging tools are stuck and cause operation accidents; at present, the flexible nipples used in production mainly have two structural forms: ball joint type and multi-link chain type, among which: the ball joint type flexible joint uses ball The matching structure of the head ball sleeve connects the upper and lower joints, and the upper and lower joints are deflected by the action of the wellbore side wall, while the multi-segment chain flexible short joint forms a flexible cylinder through the combination of multi-stage rings, and is constrained by the shape of the wellbore. To make the flexible cylinder bend, because the flexible shorts of the two structural forms are passively relying on the control constraints of the wellbore structure to achieve their own shape changes, and they can only rely on their own gravity to recover elastic deformation, making them in the The problems of response delay and low efficiency in the dynamic adaptability and coordinated change ability of the curvature of the oil well borehole are more obvious. In actual production, sometimes the friction between the flexible joint and the well wall is even increased. It is difficult to meet the drilling or logging requirements of highly deviated wells and horizontal wells, especially in recent years, the through-bit logging technology has developed rapidly, and the through-bit logging tools have small rod diameters. , high-precision features put forward higher requirements on the performance of the matching flexible sub, and the functional efficiency needs to be improved urgently. needs

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