TEMPLATE Russian patent published in 1998 - IPC

FIELD: bore-hole drilling appliances. SUBSTANCE: this is intended for checking passability of well bores and can be used in drilling and operation of wells of various purpose. Template has calibrating members which are secured on template by guide keys between appropriate stops. Calibrating members have mating slots in inner surface. Calibrating members can be displaced until they come in contact with stops. Body is provided with end stops in the form of connecting sleeves. Application of aforesaid template cuts time and expenses needed for carrying out investigations. EFFECT: higher efficiency. 3 cl, 3 dwg