The Basic Function of The Drill String

The usual components of drilling are: drill bit, drill collar, drill pipe, stabilizer, special joint and square drill pipe.

The basic function of drill string is:

(1) drill-down bit;

(2) apply drill pressure;

(3) transfer power;

(4) conveying drilling fluid;

(5) perform special operations: squeeze cement, deal with underground accidents, etc.

The use of geological drill pipe for coal mine

The drill pipe is a steel pipe with screw thread at the end, which is used to connect the surface equipment of the drill rig and the carbonyl drill mill equipment or the bottom hole device.The drill pipe is used to transport drilling mud to the drill bit and to raise, lower, or rotate the underhole unit with the drill bit.The drill pipe must be capable of being subjected to great internal and external pressure, distortion, bending and vibration.The drill pipe can be used many times during oil and gas extraction and extraction.

The light pipe and raw steel pipe are made into drill pipe after many processing steps.Firstly, through the process of thickening the steel pipe, the light pipe is faced with inner bend and the steel pipe wall is thickened.Next, the thread is processed and plated with copper that increases strength.The non-destructive quality control inspection is then performed, followed by the welding of the pipe fitting.The tube then experiences welding heat treatment and final treatment to eliminate residual welding pressure.Other tests, including hardness test, pressure test and non-destructive test, should be carried out on the finished steel pipe before painting and packing the finished drill pipe.