Integral type heavy weight drill pipe without thickening

Abstract

The invention discloses an integral type heavy weight drill pipe without thickening. The integral type heavy weight drill pipe without thickening is composed of a male adapter, a female adapter and a middle pipe, wherein the diameter of the outer wall of the male adapter and the diameter of the outer wall of the female adapter are identical. The middle pipe of the integral type heavy weight drill pipe without thickening is a round pipe with a constant diameter, the diameter of the outer wall of the middle pipe is 40 mm-50 mm smaller than the diameter of the outer wall of the male adapter arranged at one end or the diameter of the outer wall of the female adapter arranged at the other end. Due to the fact that the middle pipe is the round pipe with the constant diameter, when outer wall cutting machining is conducted, cutting forming at one-time cutter feeding can be achieved due to the fact that convex shoulders do not exist. By means of quantification cutting, machining quality can be ensured, and production efficiency can be improved. Through the application of the integral type heavy weight drill pipe without thickening, the shapes and the area of all sections of the middle pipe are equal, strength equality and flexibility value identity can be achieved, and the technology conditions for drilling directional wells or horizontal wells or large displacement wells can be completely met.

Description

technical field [0001] The invention relates to an oil drilling tool, in particular, the invention relates to a heavy drill pipe used for oil drilling. Background technique [0002] The heavy drill pipe is a part of the oil drill string, it is located between the drill collar and the conventional drill pipe, and it mainly plays the role of transition connection and torque transmission in the drill string. The weighted drill pipe is usually about ten meters in length, which is a typical slender pipe. In order to meet the needs of oil drilling, in addition to sufficient strength and corrosion resistance requirements, the heavy drill pipe must also have good flexibility to meet the technical conditions of drilling directional wells, horizontal wells or extended-reach wells. In the heavy drill pipe structure of the prior art, the outer wall of the pipe joint at both ends is convex, and the outer wall of the middle pipe is provided with segmental convex shoulders, so as to apply...

AI Technical Summary

Problems solved by technology

In the prior art, multiple shoulders are set on the external pipe wall of the middle pipe of the heavy drill pipe. Although the structure of this shoulder-type anti-wear structure is very simple, the diameter of the pipe joints at both ends is larger than that of the middle anti-wear belt, so the anti-wear belt is more effective. The grinding effect is not large, but it causes the strength of different transverse sections of the heavy drill pipe to be different, which affects the flexibility value of the entire rod body, and is not conducive to forming processing on the other hand.

Segmented cutting will inevitably reduce the coaxiality between the shoulders, and also reduce production efficiency

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