INDICATOR OF WHIPSTOCK POSITION AND BORE-HOLE CURVATURE Russian patent published in 1998 - IPC

FIELD: bore-hole indicating instrumentation. SUBSTANCE: this is used for appropriate control functions during drilling of incline-directed bore-holes. Indicator has bottom-hole instrument and orienting unit. Orienting unit is made up of body, clamping adapter with upper face bevelled inside, and orienting adapter. Outer surface of orienting adapter is provided with angular indicating scale. Bottom-hole instrument is complete with protractor which is embodied in the form of cylinder, union nut, and bush which is rigidly connected at one side with orienting unit, and at other side it is connected with protractor cylinder for possible detection of separate positions of bush by means of pin. Outer surface and end surface of protractor carry angular indicating scale. EFFECT: higher efficiency. 2 dwg