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английский) 1:
[копия]Скопировано!
WORK OF DRILL STRINGThe drill string is spuŝennuû into the well Assembly of drill pipe for supply of hydraulic and mechanical energy to the bit, the axial load on the chisel, as well as to control the trajectory of burâŝejsâ wells.As with the chisel and downhole drilling motor drilling tool, a drill string performs the following functions: transfers the rotation of the rotor to the bit; treats from the motors propelled points; delivers to faces flush agent; brings the hydraulic power to the bit and pogružnomu hydraulic motor; presses the bit into the hole, rocks acting its force of gravity; provides replacement of chisels and submersible motor by transporting them to the hatchery or on the surface; allows for emergency and other special work in the wellbore.The drill string includes the following features: drill pipes; heavy weight drill pipe; lead (working) drill pipe; subs; whipstock; centralizers, treads, and other snap-in.Lead pipe connected the upper end sub using a rotatable barrel swivel and overhead bottom sub lead pipes, and lower end-with a drill pipe, descended into the well, using bottom and pressure relief pipes leading subs. Lead pipe rotates the rotor and through drill string passes the spinning bit with rotary drilling, and the turbine is not capable, with an enclosed rotor rotating Drillstring table in the opposite direction under the influence of a moment of submersible motor.Drill pipes are connected with each other by means of locks, which consist of couplings and nipples. The lower part of the drill string is made up of 10 HDP, which are connected with each other by using the lock threads, chopped a nipple with one hand and clutch on the other. By sub bottom end of DRILL COLLAR connects directly with a chisel, or submersible motor
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