What are the classifications of down-the-hole drill pipes?
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Drill rods are divided into three categories: square shape rods, drill rods, and weighted drill rods. The connection sequence is square shape (1) + drill pipe (n, determined by the depth of the well) + weighted drill pipe (n, determined by the design of the drill tool assembly). What are the relevant knowledge points of the drill pipe below the introduction of DTH drill pipe:
The square shape is located at the uppermost end of the drill string, and there are two types of square and hexagonal.
①When drilling, the square shape rod is matched with the core and the turntable to transfer the ground rotation torque to the drill rod to drive the drill string and the drill bit to rotate;
②What are the classifications of all heavy drill pipes that bear the drill string? What are the specifications?
③ Channel for circulation of drilling fluid.
The square shape rod is composed of upper and lower joints and a pipe body. The pipe body has two structures: tetragonal or hexagonal (mostly oil drilling is tetragonal); the upper joint is a left-handed female thread (reverse buckle), which is connected to the faucet, and the left-handed female thread prevents undercutting during rotation; the lower joint It is a right-handed male thread, which is connected with the drill pipe. When working, the upper end of the square shape rod is always above the surface of the turntable, and the lower part is below the surface of the turntable.
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 continuously by the gradual lengthening of the drill pipe. Therefore, drill pipe occupies a very important position in oil drilling.
