US 5,404,944 AGranted

Downhole makeup tool for threaded tubulars

AssigneeBaker Hughes Incorporated

InventorsGerald Lynde, Ralph D. Wright, Richard A. Sukup, Patrick R. Brand

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Abstract

A downhole tool for making up threaded connections between lower and upper tubulars within a well bore includes a lower anchoring member, an upper anchoring member, and a drive member including a movable piston assembly. A plurality of straight splines on the piston assembly and mating splines on a housing rotatable with the lower anchoring member allow axial movement while preventing rotational movement of the piston assembly with respect to the lower anchoring member during the tool driving stroke. The helical drive component on the piston assembly and a mating driven component rotatable with the upper anchoring member cooperate to rotate the upper anchoring member and thus the upper tubular to make up the downhole threaded connection. According to the method of the present invention, the upper and lower anchoring members are each secured to a respective tubular, and fluid pressure is increased to drive the piston assembly downward, thereby rotating the upper tubular. A torque sub may be provided including strain gauges for measuring makeup torque And for transmitting representative signals to the surface during the makeup operation.

Claims10

Dependent claims

A downhole tool for making up a threaded connection between a lower tubular positioned within a well bore and an upper tubular positioned within the wellbore, the downhole adapter to be suspended within the well bore from a work string extending to the surface, the downhole tool comprising:

a lower anchoring member having a lower connector for selective engagement with the lower tubular;
an upper anchoring member having an upper connector for selective engagement with the upper tubular;
a drive member positioned axially between the lower anchoring member and the upper anchoring member, the drive member including a piston assembly movably responsive to fluid pressure within the work string;
a guide in engagement with the lower anchoring member and the piston assembly for permitting axial movement while preventing rotational movement of the piston assembly with respect to the lower anchoring member;
a helical drive component on the piston assembly;
and
a mating driven component rotatable with the upper anchoring member and cooperating with the helical drive component to rotate the upper anchoring member and the upper tubular with respect to the lower anchoring member and the lower tubular to make up the downhole threaded connection.

4 more elements

Dependencies are inferred from the claim text.