DEVICE FOR DRILLING TOOL CENTRING Russian patent published in 2014 - IPC E21B7/08 E21B17/10 

FIELD: oil and gas industry.

SUBSTANCE: invention relates to oil and gas industry, in particular, to devices for drilling of inclined and horizontal sites of the well. The device contains housing with inclined slots and rod placed inside it. From underneath piston is fixed rigidly to the rod; at that the piston is made annular and placed inside chamber formed by outer wall of the rod and inner wall of the housing. In inclined slots pads with teeth are fixed by pull-bars with rod. At the housing bottom there is lower crossover shoe with inner annular narrowing. Downstream of inner annular narrowing the crossover shoe has annular expansion. From above the device is equipped with telemetric system. The lower end of the rod can interact hermetically with annular narrowing. Upward spring-loaded and hollow lower piston is installed in annular expansion; the piston can move in horizontal plane to the upper part until it leaves the area of hermetic connection with annular narrowing. The rod is spring-loaded with bigger load than upward-loaded lower piston. Between the lower piston and annular narrowing there is a small ball and from bottom of annular narrowing and from top of the lower piston there are accesses for the ball which are located opposite each other.

EFFECT: device provides possibility of multiple correction of slope angle in drilling process without lifting to the wellhead.

2 dwg