INCREASING THE ENERGY EFFICIENCY OF A PUMP UNIT UNDER PULSE HYDRAULIC FRACTURING BREAKDOWN
Classical hydraulic fracturing for creating a single crack implies using a pump unit capable of injecting hundreds of tons of liquid into a layer under the pressure of about 100 MPas. Besides, fixing of a crack requires injecting a proppant and chemical reactants. Pulse hydraulic fracturing is intended for forming a network of cracks around a well due to the hydraulic fracturing liquid moving with a variable speed. Low injection pressure and small amount of injected fluid are applied. Proppant roppant and chemical reactants are n'ot used. To increase the sizes of the cracks and to save energy, it is expedient to apply, instead of high pressure, ‘reciprocation’ by periodically increasing and decreasing the speed of movement and the pressure of fracturing fluid injection. As a minimum amount of complicated equipment is involved in pulse hydraulic fracturing, the energy in operation are insignificant. The liquid-pumping modes influence the parameters of the formed cracks and the operating economy.