A hydraulically telescopic hard support reaming tool while drilling

Abstract

The invention relates to a hydraulic telescoping rigid support reaming-while-drilling tool, which is applied to a reaming-while-drilling technology for drilling operations in oil and gas fields. The invention adopts the following technical scheme: the lower end of a reverse central shaft and a main piston are in threaded connection with each other and positioned by using a bolt, and a reverse hydraulic cylinder and the upper part of the reverse central shaft are in threaded connection with each other and positioned by using a bolt; an upper joint is sequentially in threaded connection with a main shell and a lower joint, and two connecting bodies are connected by using shear pins; a sliding sleeve is arranged in the reverse central shaft, and connected by using a shear pin; a joint of the reverse hydraulic cylinder is connected with the reverse hydraulic cylinder by using a shear pin, and a small steel ball is arranged in the joint of the reverse hydraulic cylinder; a small piston, a small cylinder sleeve and a small spring are arranged between the upper joint and the reverse central shaft; three PDC (primary domain controller) tool rests are uniformly distributed on the main piston, and connected by using hinge pins, and the tool rest is provided with teeth; and a clamp spring, a piston pressing plate, a rubber cup and a cup bowl are arranged between the main shell and the main piston. The reaming tool disclosed by the invention ensures that the axial and radial positions of the PDC tool rests after being unfolded are firm and invariant, and has the advantages of no hole shrinkage and bit sticking; and the reaming tool is applied to drilling operations.

Description

technical field [0001] The invention relates to a hydraulic telescopic hard support reaming-while-drilling tool used for the reaming-while-drilling technology of oil and gas field drilling operations. Background technique [0002] Reaming-while-drilling technology is a new drilling technology with development potential. The so-called reaming-while-drilling technology is a drilling technique that uses reaming-while-drilling tools and conventional drill bit programs to expand the diameter of the wellbore while fully drilling. The reaming-while-drilling technology can realize well cementing in small intervals of deep wells, increase the size of production casing, and is beneficial to well completion and workover operations. There are two kinds of reaming tools developed at home and abroad: double-center reaming bit and telescopic reamer. The former uses the eccentric block to expand the diameter under the revolution, and the diameter expansion is limited by the inner diameter...

AI Technical Summary

Problems solved by technology

The former uses the eccentric block to expand the diameter under the revolution, and the diameter expansion is limited by the inner diameter of the casing in the upper well section; the latter uses the retractable blade to realize the diameter expansion, and the diameter expansion is not affected by the inner diameter of the casing in the upper well section. The expansion of the larger displacement can be achieved due to the limitation of the large displacement. The expansion and contraction method determines the reliability of the expansion. The existing telescopic eye reamers almost all rely on springs and hydraulic pressure to realize the expansion and contraction of the blade, which belongs to soft support and is subject to Affected by the softness and hardness of the well wall rock, it is easy to form a candied haws wellbore, which is especially difficult to realize on tools with small-scale structures, and has not been popularized and applied

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