Pipe expander for spherical corrugated pipe

Abstract

The invention provides a pipe expander for a spherical corrugated pipe, which relates to the field of oil drilling. The pipe expander comprises a roller body, a roller shaft and a pipe expander sphere, wherein the lower end face of the roller shaft is a tapered plane; a cylindrical convex shaft perpendicular to the lower end face is arranged downwardly on the lower end face; the convex shaft is provided with a through hole along the central axial line of the convex shaft; the pipe expander sphere is provided with a through hole along the central axial line of the pipe expander sphere; the convex shaft is inserted into the through hole of the pipe expander sphere from the upper end; a dowel is inserted into the through hole of the convex shaft from the lower end of the through hole of the pipe expander sphere; the pipe expander sphere is locked tightly onto the roller shaft through build-up welding; the lower end face of the roller body and the upper end face of the roller shaft are adhered with each other and are welded and fixed together; and the horizontal distance between the center of the pipe expander sphere and the central axial line of the roller body is more than 0 mm to form an eccentric structure. The pipe expander can trim the corrugated pipe to obtain reasonable roundness and surface smoothness under the condition of a lower torque; and simultaneously a structure ofa bearing part greatly improves the strength of the pipe expander so as to ensure the safety in underground construction.

Description

technical field [0001] The invention relates to a tube expander used in the field of oil drilling, and more specifically relates to a spherical tube expander applied to expandable metal bellows. Background technique [0002] As we all know, the technology of metal bellows to isolate complex well sections has remarkable effects in oil drilling, well completion and workover, and has been widely promoted and used. This technology uses the plastic deformation of metal to roll a large-diameter round pipe into a corrugated pipe with a smaller outer diameter. The diameter of the wellbore remains unchanged, thereby greatly simplifying the wellbore structure of the oil well, increasing the drilling speed, and reducing the drilling cost. At the same time, it is also simple and effective to solve the problem of wellbore stability in complex well sections, and even a single well in deep wells can be realized. Hole size drilling and single casing size completions allow deeper vertical a...

AI Technical Summary

Problems solved by technology

Due to the limitation of the structure of the ball bearing itself, its wear resistance and mechanical strength cannot well meet the requirements of the drilling and expansion process, and its expansion components are easy to fall off from the ball bearing of the journal

Images