Drill pipe can be divided into three types: square drill pipe, drill pipe, and weighted drill pipe. The connection methods of these three types of drill pipe can be divided into square drill pipe root + drill pipe/N root (the number of drill pipes is determined by the depth of the well) + weighted drill pipe (the number is determined by the design of the drilling tool assembly)
Square drill pipe is located at the top of the drill string and has two types: square and hexagonal. In rotary drilling, when drilling, the square drill pipe cooperates with the square bushing and the rotary bushing to transmit the ground rotary torque to the drill pipe to drive the drill bit to rotate; and bear the weight of the drill string hanging weight. The square drill pipe is located at the top of the drill string and is divided into two types: square and hexagonal.
Square drill pipe consists of three parts: upper joint, lower joint, and pipe body. The pipe body is divided into two structures: square and hexagonal (square structure is mostly used in oil drilling); the upper joint is a left-hand female thread (reverse thread), connected to the faucet, and the left-hand female thread prevents reverse threading during rotation; the lower joint is a right-hand male thread, connected to the Drill Pipe.
Precautions
During construction, it should be noted that the upper end of the square Drill Pipe is always above the turntable surface, and the lower part is below the turntable surface. The main function of the square Drill Pipe is to convert the rotation of the turntable into the rotation of the entire drill string and drill bit to break the formation, that is, to transmit torque and bear the entire weight of the drill string. The company currently has various specifications of square Drill Pipe and hexagonal Drill Pipe from 2 7/8″ to 6 5/8″.
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