AUTONOMOUS MODIFICATION OF THE FREQUENCY OF ROTATION OF THE SITE OF THE DRILL STRING Russian patent published in 2018 - IPC E21B17/04 E21B4/02 E21B47/12 

FIELD: mining.

SUBSTANCE: method of operation of drill string includes a standalone modification of frequency of rotation located in the borehole of the plot of the drill string in borehole hosted on other sites the drill string, each of these sites contains many sections of drill pipe. The drill string that has altered the frequency of rotation, can represent the lower section of the drill string, located between the end of the drill string, located on the bottom and curved stretch of wells in which the drill string. The lower stretch of the drill string can have increased frequency of rotation relative to the rotational speed of the Drill string plot located within curved plot hole. Autonomous modification of frequency of rotation can be implemented by attaching one or more gears to the drill string, and gear specified device made with the ability to switch between release mode, in which the specified device transmits the torque and the rotation of the drill string without modification, and the clutch, which specified the device transmits the torque and the rotation of the entire length of the drill string with a modified rotational speed and torque. Selective switching gear shifting devices located in the well can be carried out from the ground.

EFFECT: stable rotation speed of each of the sections of the drill string.

22 cl, 9 dwg