RU1789636C - Method of drilling of boreholes - Google Patents

Description

axial rotation of the bit-drilling system with periodic feeding of it to the bottom, regulator 9 for matching forced alternating torsional vibrations of the system with its own free torsional vibrations of this system, feed force regulator 10, rotational speed regulator 11, the inputs of which are connected 12 and 13 of the boundary values with the outputs of the extreme controller 14, designed to select the values of the feed force and rotational speed, the comparison unit 15, the resonant frequency unit 16, the summing unit 17, will convert 18 and 19 if the angle of rotation, servo motors 20 and 21, 22 of the frequency spectrum analysis, extreme controller 23 loads the sensors 24 and 25, borehole depth.

The drilling method is carried out as follows.

When the engine 1 of the rotator is turned on through the gearbox 2, the drill string 3 through the chuck 6 starts rotation, which is transmitted to the bit 7.

When the bit 7 interacts with the destructible medium, stochastic loads arise on it, which are sensed by the load sensor 24 and fed to the input of the frequency spectrum analyzer 22, built on double T-shaped filters. The output voltage of the spectrum analyzer 22 is supplied to an extreme controller 23, which, using the servomotors 20 and 21, selects a T-shaped filter of the spectrum analyzer at which the output voltage of the latter will be maximum. Using potentiometric transducers 18 and 19 and a summing unit 17, an electrical signal is obtained at the output of the latter. Further this signal

in block 15, it is compared with a signal proportional to the resonant frequency received at the output of block 16. A signal proportional to the mismatch is fed to the input of the extreme controller 14, which, with the help of the regulators of feed force 10 and rotational speed 11, selects a ratio that does not go away resonant frequency. Knob 8 adjusts the axial rotation of the bit and

positioning with periodic feeding to the face so that during the period of one step of the periodic feeding, an integer number of axial rotation periods of the bit are carried out. The regulator 9 coordinates forced alternating torsional vibrations supplied to the bit-drilling system with its own free torsional vibrations of this system. In case of mismatch

natural vibrations in the structural material of the bit and the drill string, internal friction occurs, accompanied by hysteretic energy losses and fatigue phenomena leading to

reducing the life of drilling equipment. Coordination of forced alternating torsional vibrations with free intrinsic torsional vibrations of the bit together with the stave leads to a decrease in internal friction, hysteresis losses and an increase in the service life of the equipment.

Claims (1)

The method of drilling wells, according to which the axial rotation of the bit and the drill string is carried out, provide a periodic supply of the bit to the bottom with the application of the forced alternating torsional vibrations to the last and drill string, measure and regulate the speed of rotation of the bit and the drill stand, characterized in that, with the aim To increase the drilling efficiency, the forced alternating torsional vibrations of the bit with the drill stand are coordinated in frequency and phase with the free natural oscillations of the bit with the drill stand. Editor & g. Compiled by A. Roshas Tehred M. Morgenthal Proofreader S. Baker