DRILL PIPES (EN: drill pipes; DE: Bohrgestange; FR: tiges de forage, tubes de forage; ES: varillas de sondeo; RU: бурильные трубы) are the major component of the drill string, which is purposed for the descent into the drilled well, and for the ascent of the rock-destructing tool, for the transmission of the rotation, for the creation of the axial load onto the tool, for the transportation of the drilling fluid into the bottomhole of the drilled well.
They manufacture the drill pipes of the seamless type, which are made of the carbon or alloyed steels, mostly with the upset of the ends. The diameter of the drill pipes is 33.5-168 millimetres (they use the drill pipes with the diameter of up to 60 millimetres mostly for the geological-exploratory core drilling).
The drill pipes are connected one with another with the help of the drilling lock joints; in the field of the core drilling, they also use the nipple connections. Besides the steel pipes, there are also used the pipes, which are made of the light alloy. They manufacture the drill pipes, which are made of the light alloy (of the round cross-section, with the thickness of the wall of 9-17 millimetres), with the thickened ends, using the method for the pressing of the heat-treated aluminium alloy. For the connection of these pipes, they use the drilling lock joints of the design with the decreased mass. There also belong to the drill pipes, the (UBT) drill pipes with the increased mass, and the (BT) leading drill pipes. They manufacture the steel drill pipes with the increased mass, with the prevalently circular cross-section, as the thick-walled pipes from the forging, with the mechanical processing, or of the hot rolled type. They are purposed for the creation of the load onto the rock-destructing tool, for the increasing of the rigidity of the lower part of the drill string. The UBT set of pipes comprises the pipes, which are connected with the help of the drilling lock joint screw thread (the length is up to 300 metres). For the fight against the curvature of the drilled well, they use the UBT drill pipes of the square cross-section, with the welding of the hard metal belts onto the faces of the product; while for the prevention of the sticking, they use the drill pipes with the spiral milled grooves. The leading drill pipes are usually of the square or hexagonal cross-section, they install them at the top of the drill string, and transmit to them the rotation from the mover of the drilling installation.
They issue the drill pipes of the two designs: the whole pipes, which are made of the forged billet, with the thickened ends, and with the thermal and mechanical processing along the entire length; the assembled pipes, which are made of the hot rolled billet with the intermediate joints, which are screwed onto the ends of the pipe, analogously to the drilling lock joint.
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