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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. References 1. Viktorin V.D., Vliyanie osobennostey karbonatnykh kollektorov na effektivnost' razrabotki neftyanykh zalezhey (The influence of carbonate reservoirs in the efficiency of the oil deposits development), Moscow: Nedra Publ., 1988, 150 p. 2. Cherepanov S.S., Ponomareva I.N., Erofeev A.A., Galkin S.V., Determination of fractured rock parameters based on a comprehensive analysis of the data core studies, hydrodynamic and geophysical well tests (In Russ.), Neftyanoe khozyaystvo = Oil Industry, 2014, no. 2, pp. 94–96. 3. Denk S.O., Problemy treshchinovatykh produktivnykh ob"ektov (Problems of fractured productive reservoirs), Perm': Elektronnye izdatel'skie sistemy Publ., 2004, 334 p. 4. Lebedinets L.P., Izuchenie i razrabotka neftyanykh mestorozhdeniy s treshchinovatymi kollektorami (Research and development of oil fields with fractured reservoirs), Moscow: Nauka Publ., 1997. 5. Kashnikov Yu.A., Gladyshev S.V., Popov S.N., Analysis of well output dynamics exploiting turnejsko-famensky productive sites of oilfields located in the north of perm territory (In Russ.), Geologiya, geofizika i razrabotka neftyanykh i gazovykh mestorozhdeniy, 2009, no. 10, pp. 56–61. 6. Kashnikov Yu.A., Ashikhmin S.G., Shustov D.V. et al., Experimental and analytical studies of fracture permeability changes due to crack closure (In Russ.), Neftyanoe khozyaystvo = Oil Industry, 2013, no. 4, pp. 40–43. 7. Barton N.R., Bandis S.C., Deformation and conductivity coupling of rock joints, International Journal of Rock Mechanics and Mining Science & Geomechanics Abstracts, 1985, V. 22, pp. 121–140. 8. Tran D., Settari A., Nghiem L., New iterative coupling between a reservoir simulator and a geomechanics module, SPE-88989-PA, 2004. 9. Fiaer E., Holt R.M., Horsrud P. et al., Petroleum related rock mechanics, Elsevier Science, 2008, pp. 391–434. |
