Mechanical completion string running tool

Abstract

A mechanical completion string running tool is applied to running of a completion string for oil and gas well drilling. The lower end of an upper joint is in threaded connection with a guide sleeve; a minor-diameter cylindrical tube at the upper end of a rotating mandrel is placed inside a central hole at the lower end of the upper joint; a compression spring is sleeved at the upper end of the rotating mandrel; a plane bearing sleeve at the lower end of the rotating mandrel is located on the outer wall of the minor-diameter cylindrical tube of the rotating mandrel; an annular step is arranged on the inner wall of the guide sleeve, and an annular shaft shoulder which protrudes outwards at the upper end of a major-diameter cylindrical tube of the rotating mandrel is matched with the annular step on the inner wall of the guide sleeve; the major-diameter cylindrical tube of the rotating mandrel is arranged inside the guide sleeve; a helical groove is arranged on the outer wall of the major-diameter cylindrical tube of the rotating mandrel, and a guide pin is fixed inside a screw hole of the guide sleeve; and the lower end of the rotating mandrel is connected with a transitional short connector and a casing shoe with cutting teeth. The mechanical completion string running tool has the advantages that the completion string is lifted and put down to remove obstructions for the string in the process of removing obstructions for descending the string.

Description

technical field [0001] The invention relates to the technical field of oil and gas drilling, in particular to a special tool for running a completion pipe string, which is a running tool for a mechanical completion pipe string. Background technique [0002] With the continuous deepening of exploration and development, the number of deep wells, ultra-deep wells, horizontal wells, and extended-reach wells is increasing, and the running depth of pipe strings (such as casing and screen pipes) is increasing. The eye trajectory is becoming more and more complex, which also puts forward higher and higher requirements for the lower pipe technology. [0003] At present, when the bottom of the completion string encounters large cuttings and rocks when running the completion string, the conventional solution is: rotate the string, lift and lower the string, and establish mud circulation at the same time. This method can effectively solve the problem of lowering completion strings for ...

AI Technical Summary

Problems solved by technology

However, when running complex completion strings in complex wells such as extended reach, once the completion string encounters resistance, it is difficult to rotate the entire string due to the high borehole friction

Sometimes it is possible to damage complex completion strings even when the string is able to be rotated

Especially for conventional drilling without top drive and casing clamping head, once the completion string is blocked, the establishment of mud circulation requires repeated disassembly and assembly of the casing buckle and a variable buckle joint to connect the casing and the kelly. Not only wasting a lot of time, but also the repeated disassembly and assembly of the casing buckle on-site construction requirements are not allowed

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