A drill pipe with wellbore cleaning function

Abstract

The invention provides a well cleaning functional type drill pipe. A pipe body is connected with an internal threaded joint and an external threaded joint in a welded mode, and welding seams are formed at the welding position of the pipe body and the internal threaded joint as well as the external threaded joint; a thickening section is arranged in the middle position of the pipe body, conical segments are machined at the two ends where the thickening section intersects with the pipe body, and the middle of the thickening section is a cylindrical segment; and an internal thread and an externalthread which are mutually cooperated are machined on the internal threaded joint and the external threaded joint correspondingly. The well cleaning functional type drill pipe has the advantages thatdrilling fluid is automatically disturbed by the drill pipe, so that the flow regime of the drilling fluid is changed, and the cuttings carrying ability of the drilling fluid is improved; due to disturbance of the drill pipe, cuttings deposited at the bottom of a well is disturbed, the drilling fluid entering into the turbulent flow state is brought out of the well, and the well cleaning effect isachieved; and the problems of sand setting, friction, backing pressure and the like of a drill column in the drilling process are effectively solved, and short tripping of the drill column, mud circulation well-washing operation time and risks of downhole complex accidents are reduced.

Description

technical field [0001] The invention relates to the field of borehole drill pipes, in particular to a borehole cleaning functional drill pipe. 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 function of helping drilling fluid to carry rock. Therefore, in the construction of horizontal wells, especially horizontal wells with long horizontal sections and extended Due to the instability of the well wall, a large amount of cuttings will be piled up, complex downhole accidents such as drill string jamming will occur, and even the drill string will be buried, resulting in drilling failure. The reason is that the cuttings have to ...

AI Technical Summary

Problems solved by technology

Conventional drill strings do not have the function of helping drilling fluid to carry rock. Therefore, in the construction of horizontal wells, especially horizontal wells with long horizontal sections and extended Due to the instability of the well wall, a large amount of cuttings will be piled up, complex downhole accidents such as drill string jamming will occur, and even the drill string will be buried and cause drilling failure.

The reason is that the cuttings have to migrate a long distance in the water well section. Due to the effect of gravity and the limitation of the rock-carrying capacity of the drilling fluid, the cuttings will gradually sink during the migration, and finally sink to the bottom of the wellbore, forming For the cuttings bed at the bottom of the wellbore, as the thickness of the cuttings bed increases, the mud channel will become smaller, the mud’s rock-carrying capacity will further decrease, the thickness of the cuttings bed will further increase, and the supporting pressure and wear resistance of the drill string will increase. Increased risk of downhole complex accidents such as drill string jamming

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