Simple quick lifting drill collar

Abstract

The invention discloses a simple quick lifting drill collar. The simple quick lifting drill collar is provided with an upper connector section, an elevator groove, cone sections and a drill collar body, wherein the upper connector section and the elevator groove are in transitional connection by adopting a step section; the step section at least comprises a cylindrical section and two cone sections; actual use proves that a stress centralization phenomenon can be avoided better compared with that adopting round corner treatment, and structural damage phenomena such as cracks and the like are not easily caused. According to the simple quick lifting drill collar, elevator grooves with the same size are adopted for drill collars with different outside diameters; the outside diameter of each elevator groove is Phi 149 mm; the drill collars in different specifications are lifted by using elevators in a uniform specification; the cost for purchasing the elevators can be reduced; the field work efficiency is greatly improved; the potential safety hazard is reduced; the simple quick lifting drill collar is a remarkable improvement in drill collar industry. The elevator groove and a drill collar body are in transitional connection at the boundaries by adopting the cone sections; the included angle between the inclined surface of each cone section and the axis of the drill collar is 6 degrees; after the design scheme is adopted, the maximal stress value generated by the drill collar is minimal.

Description

technical field [0001] The invention relates to a simple and fast lifting drill collar, which adopts elevator grooves of the same size for drill collars of various specifications and models. Background technique [0002] Drill collars are an essential tool for oilfield drilling. During drilling, dozens of drill collars are installed under the drill pipe with a length of several kilometers, and the drill collars are connected to the drill bit. The diameters of the drill collars are connected sequentially from large to small from the drill bit end to the drill pipe end, and each drill collar weighs several tons, so that the drill bit has enough pressure to drill. Usually, when lifting these drill collars, use the elevator grooves on the outer diameter of each drill collar, and use the elevators to catch the elevator grooves on the drill collars to lift or move them to a predetermined position, so that a A drill collar is removed. [0003] The drill collar in the prior art ha...

AI Technical Summary

Problems solved by technology

Therefore, in the process of lifting and unloading drill collars, it is necessary to constantly replace the corresponding elevators for drill collars of different diameters, which is not only labor-intensive, but also inefficient, and there are certain safety hazards

[0004] In addition, in the prior art, rounded corners are usually used at the boundary between the upper joint section 1 and the elevator groove 3, but in actual use, it is found that the structural strength of the boundary is limited by the rounded corners, and stress concentration still occurs here , prone to cracks, the slope transition is usually used at the boundary between the elevator groove 3 and the drill collar body 5, but there is no in-depth study on the angle of the slope. Although these design features can improve the structural strength of the drill collar to a certain extent, the structure of the drill collar Still not optimally optimized

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