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Classification of drill pipe

release time：2023-08-25

source： Network

Drill pipes are divided into three categories: kelly pipe, drill pipe and weighted drill pipe. The connection sequence is kelly (1) drill pipe (n, determined by the depth of the well) heavy drill pipe (n, determined by the design of the BHA).

Role

The drill pipe is the basic part of the drill string. Its main function is to transmit torque and transport drilling fluid, and to deepen the borehole by the gradual lengthening of the drill pipe. Therefore, drill pipe plays a very important role in oil drilling.

Structure

Drill pipe structure The drill pipe is made of seamless steel pipe, and the wall thickness is generally 9~11mm; the pipe body and the joint composed of two parts of the drill pipe body and the drill pipe joint are welded together by friction welding.

Square drill

Kelly is located at the uppermost end of the drill string, and there are two types of square and hexagonal.

Role

① During drilling, the kelly rod cooperates with the core filling and rotary table core filling to transmit the ground rotating torque to the drill rod to drive the drill string and bit to rotate;

② bear the full weight of the drill string;

③ Channel for drilling fluid circulation.

Structure

Kelly is composed of upper and lower joints and pipe body. The pipe body is of square or hexagonal structure (mostly for oil drilling); the upper joint is a left-hand female thread (reverse thread), which is connected with the faucet, and the left-hand female thread prevents reverse thread during rotation; the lower joint is a right-hand male thread, which is connected with the drill pipe. When working, the upper end of the Kelly is always above the surface of the rotary table, and the lower part is below the surface of the rotary table.

Weight

The weighted drill pipe is similar to the oil drill pipe and is also a hollow steel column with a length of about 10 meters. However, the single weight is heavier than the oil drill pipe, and the wall thickness is 2 to 3 times that of the drill pipe. The weighted drill pipe is connected between the drill pipe and the drill pipe to prevent fatigue damage due to the change of the drill string section. It can also replace part of the drill collar, but its suspension is simple, tripping operation is convenient, and tripping time can be saved.

Introduction of joints of drill pipe

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Introduction of joints of drill pipe

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