METHOD FOR ESTIMATING THE LENGTH OF MAN-CAUSED FRACTURE DEPENDING ON BOTTOMHOLE INJECTION PRESSURE

Abstract

Most of Russia's recoverable oil reserves are hard-to-recover reserves. One of the key technologies for the development of these reservoirs is the use of a reservoir pressure maintenance system. The evolution of the development of flood control methods does not stand still. Today, the issue of studying the propagation of self-induced hydraulic fracturing cracks is one of the most important challenges. Over time, as the transition to the development of zones with low permeability values and an increase in down hole pressure in injection wells, the manifestation of the self-induced hydraulic fracturing effect began to be widespread. This was confirmed not only by the dynamics of the water content of products with an increase in the pick-up of neighboring injection wells, but also by hydrodynamic studies of wells, tracer studies, adaptation of the hydrodynamic model taking into account the cracks of the self-induced hydraulic fracturing. Over time, according to the results of studies of geomechanical properties in the deposits of Western Siberia, the direction of the regionally stressed state was established, which coincides with the azimuthal direction of the development of self-induced hydraulic fracturing cracks. Modern development systems take into account the direction of the regional stress state. These systems are mainly located parallel to the cracks of the self-induced hydraulic fracturing to exclude breakthroughs from injection wells to producing wells.
 Estimation of the parameters of auto-fracturing fractures depending on the injectionmodes is an urgent task that requires the creation of appropriate calculation methods. Control of the waterflood modes for a group of injection wells under conditions of critical bottomhole pressures exceeding the value of the rock fracture pressure is the purpose of this work. A method for estimating the parameters of man-caused fracture from given initial parameters is proposed.