METHOD OF INVESTIGATION AND INTERPRETATION OF RESULTS OF WELL AND FORMATION INVESTIGATIONS Russian patent published in 2003 - IPC

FIELD: oil and gas producing industry, particularly, investigation of prospecting, producing and injection wells and formations. SUBSTANCE: method includes drilling of vertical, injection and/or prospecting, development wells and tapping of producing interval. Investigations at the first and second stages for period of time from O to T1 and from T1 to T2, respectively, are carried out under transient conditions of filtration for obtaining curve of bottomhole pressure recovery. At the first stage, oil is withdrawn with variable in time production rate without limiting time of well shutdowns T2-T1. At the third stage, during time from T2 to T3, water is injected into well with variable in time flow rate. At the fourth stage, during time period from T3 to T4, fluid from well is withdrawn, first withdrawal of injected water, then, water and oil, and, at last, only oil. In so doing, performed during all stages are measurements of production rate of oil and water, water flow rates, bottomhole pressure and factor of water-saturation of bottomhole formation zone. Results of said measurements are used for determination of coefficient of absolute permeability, porosity factor, skin factor, mobility thresholds of water and oil mobility, degrees of functional relationships of phase permeability for oil and water. EFFECT: extended set of determined parameters of formation under formation conditions applicable in compiling of design documents. 3 cl, 8 dwg, 1 tbl