A functional drill pipe for wellbore shaping

Abstract

The invention provides a borehole shaping functional drill pipe. A pipe body is in welding connection with an inner threaded joint and an outer threaded joint. Welding seams exist between the pipe body and the joints. An inner thread and an outer thread matched with each other are machined in the inner threaded joint and the outer threaded joint correspondingly. A thickened section is arranged inthe middle of the pipe body, and the thickened section is composed of two tapered sections at the two ends and a cylindrical section in the middle. Hard alloy teeth or diamond compound sheets are inlaid in the top faces of the two sides of the thickened section. The borehole shaping functional drill pipe has the advantages that the borehole shaping functional drill pipe can conduct finishing on the partially irregular borehole well wall, and thus the cutting carrying capacity of drilling fluid is improved. Due to disturbance of the drill pipe, the drilling fluid in the turbulent flow state isbrought out of a borehole, and thus the effect of borehole cleaning is achieved. The borehole shaping functional drill pipe has the function of finishing the inner wall of the borehole, and the problems of settled sand, abrasion, backing pressure, blockage and the like of a drill column in the well drilling process are effectively solved.

Description

technical field [0001] The invention relates to the field of wellbore drill pipes, in particular to a drill pipe with wellbore shaping function. Background technique [0002] Drill pipe is an important tool in oil and gas exploration and development. A single drill pipe is connected by a drill pipe joint to form a whole drill string. The drill string is a circulation channel for high-pressure drilling fluid, which lubricates and cools the drill bit and takes away the broken cuttings of the drill bit. Conventional drill strings do not have the functions of shaping the borehole wall and helping the drilling fluid to carry rock. Therefore, in the construction of horizontal wells, especially horizontal wells with long horizontal sections and extended-reach wells, there are often backpressure, The drill string has high friction resistance, and even the blockage of the drill string may be caused by a large amount of cuttings piled up due to the instability of the wellbore wall or...

AI Technical Summary

Problems solved by technology

The irregularity of these wellbore shapes and wellbore trajectories further increases downhole complex hazards such as back pressure, friction resistance and drill string sticking of the drill string, and even prevents the casing operation from running smoothly to the expected position.

Images