Geomechanical and hydrodynamic estimation of the bottom-hole pressure influence on the well performance

UDK: 622.
DOI: 10.24887/0028-2448-2019-11-111-115
Authors: Yu.A. Kashnikov (Perm National Research Polytechnic University, RF, Perm), S.Yu. Yakimov (Perm National Research Polytechnic University, RF, Perm)

The article considers geomechanical and hydrodynamic estimation of the influence of bottom-hole pressure on the well performance in fractured porous reservoir in Perm region. Analysis of the dynamics of the well productivity together with an analysis of the dynamics of the reservoir and bottom-hole pressure was made. The result of analysis indicates a significant impact of increased values of effective stresses in the rock, acting on the walls of natural fractures and occurring in the process of reducing reservoir and bottom-hole pressures of wells, on the permeability of fractured rocks. In order to determine the laws of the distribution of the parameter of the intensity of crack closure in the rock, depending on various geological conditions, tests of physical-mechanical and filtration-capacitive properties of core samples with fractures in reservoir conditions were performed. As a result, the dependence of parameter of the intensity of crack closure change from P-wave was obtained. Subsequently, the results were applied in the process of hydrodynamic modeling of development of studied oil fields. Considering of the dependence of natural fracture permeability from high effective pressures allows increasing the reliability of forecasting indicators of hydrocarbon reservoirs. A software module was developed that works in conjunction with hydrodynamic simulator Tempest More and allows determining critical values of bottom-hole pressures in vertical and horizontal wells in fractured carbonate reservoir with reference to geophysical characteristics.


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