ASSESSMENT OF INFORMATIVE VALUE IN DETERMINATION OF RESERVOIR FILTRATION PARAMETERS BASED ON INTERPRETATION OF PRESSURE STABILIZATION CURVES

• Main Authors: Dmitry A. Martyushev, Anna Yu. Slushkina
• Format: Article
• Language: Russian
• Published: Tomsk Polytechnic University 2019-10-01
• Series: Известия Томского политехнического университета: Инжиниринг георесурсов
• Subjects: well test; stabilization curve; pressure build-up curve; production analysis; low-permeability reservoirs; formation filtration parameters; software product kappa
• Online Access: http://izvestiya.tpu.ru/archive/article/view/2295/2074

The relevance of the research is caused by the fact that the main sources of information on filtration parameters of the remote zone of the formation are well tests at unsteady regimes with the recording of pressure or level recovery curves (pressure recovery curve or recovery curve). To determine the reliable parameters of the formation zone remote from the well, the duration of recording of the pressure recovery curve and the recovery curve should be long enough, which leads to losses in oil production. To determine the filtration characteristics of the formation, as well as reduce losses during hydrodynamic studies, it is possible to use the method of studying wells without stopping them – the method of stabilizing the pressure. However, now, the issue of analyzing and interpreting the results of measurements with the recording the pressure stabilization curves, which, like the pressure recovery curve, can give the required information about the formation, remains poorly understood. The main aim of the study is the comparison of the informative value of reservoir parameters based on analysis and interpretation of pressure recovery curves, pressure stabilization curves and production analysis in the software product KAPPA Workstation v.5.20.01 (modules Saphir and Topaz). Object: terrigenous reservoirs of deposits of Perm region. Methods: modern software product of the 5th generation KAPPA Workstation v.5.20.01 (modules Saphir and Topaz). The results. The paper considers the particularly topical problem of well data interpretation from hydrodynamic studies in low-permeability reservoirs, because, due to low reservoir properties, well pressure is restored for long periods of time, and despite this, it is not always possible to achieve complete pressure recovery. In cases where the pressure reduction curves are not sufficiently recovered, it is not possible to reliably determine the filtration parameters of the formation, or it is possible to determine them evaluative. Pressure stabilization studies and production analysis, in their turn, in most cases have a longer duration than studies of the methods of the pressure recovery curve, and therefore, on the diagnostic chart, it is possible to clearly identify the radial filtration site and obtain reliable reservoir parameters. As a result, it can be concluded that when comparing the results obtained during the interpretation of the pressure recovery curves with the parameters obtained during the processing of the pressure stabilization curve and the extraction analysis, a high convergence is obtained, and the error is within 5 %.