Patent RU-2692369-C1 (RU)
Inventor: Yakasov Aleksej Vasilevich
IPC: E21B47/10
Filed: 2018-12-26
Granted: 2019-06-24
Abstract: FIELD: mining.SUBSTANCE: claimed invention relates to complex systems and methods of designing deposits and can be used to solve the problem of determining the optimal method of placing wells at a deposit. Method includes formation of a set of initial geological, topographic, geophysical data characterizing the formation, determination of a set of output variable parameters characterizing the development system, wherein for each type of the development system and each variable parameter of the development system, a number of steps are taken. Said steps include: generating a development system element template; determination of yield of all wells included in formed template of development system element, for this purpose wells with different type of completion, included into template, are represented in the form of point sources. Geometrical parameters of current tubes are determined based on the obtained yields of all point sources. Two-phase transient filtration of incompressible liquids is calculated along each current tube, resulting in distribution of water and oil saturation along each current tube, as well as dynamics of oil production and water production / pumping for all point sources. Solutions are summed up on all sources corresponding to each well, as a result of which a stationary two-phase solution is obtained for well flow rates. Single-phase flow rates of all point sources simulating the wells in the development system element are calculated using the piezoelectric conductivity equation by the quasi-stationary approximation method, after which a non-stationary single-phase solution for well flow rates is obtained, which characterizes dependence of well flow rate on time, by summation of single-phase yields on all point sources corresponding to wells. Single-phase non-stationary solution and stationary two-phase solution are combined, as a result, dynamics of oil and water production, water pumping for all wells is obtained. Flow rates of wells are determined based on their location on thickness map, after which the wells ranging from large thicknesses to smaller ones are performed in accordance with geometrical parameters of the template element of the development system and based on the comparison, wells having a positive value of pure discounted income (NPV) are selected. Total well profiles, oil and injection are calculated by selected wells. Dynamics of gas production is determined from obtained profiles of oil production based on gas content. Total NPV is determined from total oil production profiles. Said steps are repeated for each type of development system and for each other value of the parameter to be sorted in one development system. Optimum system of deposit development is selected based on maximum value of complex optimization target parameter.EFFECT: technical result consists in provision of potential possibility of increasing oil recovery of formations, which is manifested in increase of oil recovery factor (ORF) due to preliminary determination of optimal version of arrangement of wells at deposit.4 cl, 22 dwg, 1 tbl