METHOD OF WELL DRILLING Russian patent published in 1997 - IPC

FIELD: well drilling. SUBSTANCE: method of well drilling includes running into well of drill string having drill bit above-bit collar, drill collars, drill pipe string; injection of mud into hollow of drill pipe string; rotation of drill string by rotary table with bringing of drill bit to bottom hole and drill bit partial loading by the weight of drill collars. Drill bit is, first, loaded by constant component of the force of hydraulic tension of drill string which is, then, added to the preset load of a part of weight of drill collats. The preset load is obtained by reducing the Certificate load by the sum of dynamic components of hydraulic forces acting on the drill bit and characteristics of the above-bit collar depending on the technical condition parameters of drilling are selected from the respective mathematical expressions. EFFECT: higher efficiency. 2 cl, 4 dwg