... Abstract. Impact rotary drilling is a kind of new drilling technology, developed on the basis of rotary drilling, the principie of which is that the energy of drilling fluid during circulation and hydraulic impactor connected to the bit applies periodic and high-frequency impact loads...

... drilling process have been made. These tests have verified the applicability of the basic data upon which the process is based. They have also shown that, in comparison with conventional rotary drilling, the penetration rate is as much as twenty times faster, and that the total penetration per bit...

...A STUDY OF ROTARY DRILLING BY MEANS OF MEASURING THE TORQUE OF CONE BITS Abstract The torque of a rotating bit has a close relationship to the movement of teeth of the bit and to the drilling rate. Under loads of 500 - 9,000 kilograms with rotary speeds of 22 - 168 rpm, the torques of 29-in., 33411...

... turbodrill all-union research institute Performance characteristic rotary drilling turbine utilization horsepower Section I I - Paper 35 - PD 5 USSR PROBLEMS OF DEEP-DRILLING R. A. loannessyan - E. I. Taguiev - A. O. Assan-Noory - N. S. Timofeyev - Abstract. The report deals with trends...

.... New deep drilling methods, based on various sources of energy, ure in the process of development. The use of the electrodrill, together with that of air or gas instcad of mud as the drilling fluid, improves bottom-hole performance while drilling under several severe eonditions. Vibro-rotary drilling...

... of the exit impossible in rotary drilling, especially in drilling edge facilitated the lessening of losses in the through hard rock formations and at great depths. vortical track. The broadening of the axial This multistage turbo-drill was not introduced clearance in the turbine between the stator...

.... With the greater prominence of rotary drilling, logs became more difficult to interpret and in a large proportion of wells there was no adequate record of the strata drilled through. This has proved an incentive to the development of coring, but there are many wells drilled in which but little coring is carried...

... be carried away from the bit by the mud stream, but that (ii) they should be "dropped" drilling operation Upstream Oil & Gas mud fluid rotary drilling 1933. World Petroleum Congress ...