METHOD OF MONITORING DEVELOPMENT OF OIL DEPOSIT WITH NONUNIFORM STRATIFIED FORMATIONS Russian patent published in 2002 - IPC

FIELD: oil producing industry. SUBSTANCE: method includes determination of permeability, porosity, thickness of each interlayer, viscosity of displacement agent and displaced fluid, initial and final saturation with displacement agent, elastic properties of displacement agent and displaced fluid, and compressibility of porous medium, modified functions of relative phase permeability of displacement agent and displaced fluid. Field-engineering information on operation of each well is additionally gathered. Fields of initial oil-saturation are constructed and mathematical modelling of filtration processes in nonuniform stratified medium is effected with subsequent monitoring of filtration flows formed in development of oil deposits. In accordance with results of mathematical modelling, maps of isobars, saturation with displacement agent and actual oil-saturated thicknesses are constructed for any moment of time. In mathematical modelling of filtration processes, acceptable degree of matching of calculated and actual process characteristics is to be attained. Coefficients of covering and ruggedness of formation are additionally studied. Defined more accurately are modified functions of relative phase permeability of displacement agent and displaced fluid in accordance with field-engineering information on operation of each well by adaptation of mathematical model of filtration processes to history of development of oil deposit. In this case, coefficients of covering and ruggedness of formation are taken in consideration. In accordance with defined more accurately modified functions of relative phase permeabilities, in preset class of parametric set, describing relative phase permeabilities, relative phase permeabilities of displacement agent and displaced fluid are restored as a result of inverse problem solving of multiphase filtration for nonuniform stratified medium model. EFFECT: higher efficiency and accuracy of monitoring of development of deposit and refining of parameters of displacement agent and displaced fluid. 3 cl, 4 dwg, 4 tbl, 2 ex