METHOD FOR CREATION OF WHIPSTOCK Russian patent published in 2000 - IPC

FIELD: bore-hole deviating equipment. SUBSTANCE: this relates to mining industry and particularly to cutting-in of second bore-hole during drilling procedure. According to method, cement bridge is installed in deviating interval from which second bore-hole is to be cut in. Cement bridge is covered with binding material and shuttering is brought down. Shuttering is made up of trough with reverse wedge and of tail-piece of easy-crushable component. In case of necessity, tail-piece can be made up of two or several components of different specific weight. In this case, trough of wedge is automatically oriented towards side of cutting-in due to displacement of center of gravity. After that, string of drilling pipes is lowered into bore-hole so as to force wedge trough up to cement bridge. After hardening of binding material, cut out is opening of required length. Application of aforesaid method allows for reducing time needed for cutting-in of second side bore-hole due to automatic orientation and positioning of wedge in hole of well. EFFECT: higher efficiency. 2 dwg