PROCEDURE EVALUATING PERMEABILITY OF ROCKS AND FLOW RATE OF OIL AND GAS WELLS

摘要

oil industry, investigation of wells and pools. SUBSTANCE: geophysical methods of examination in holes are employed to determine thickness and permeability of pool-collector. Flow rate of oil and gas well is modeled in accord with single- and double-term models. Then potential flow rate of well is calculated by formula Dupuy formula with allowance for difference of pool and hole clearance pressure per each tested well and for viscosity of oil. Actual flow rate is found and compared with potential ( predicted ) one to determine relative error of prediction. In this case thickness of pool is defined in perforation interval of production wells. Cores are sampled in addition for any type of collector and dependence of their permeability on factor of porosity is studied. Factor of permeability of pool-collector is found with use of dependence of permeability on factor of porosity obtained by geophysical methods of examination in holes. Actual flow rate is compared with potential one and if they are approximately equal or if potential flow rate is higher than actual one then type of collector is characterized as granular. If actual flow rate is several times as high as potential one then type of collector is characterized as jointing. EFFECT: increased efficiency of procedure thanks to diagnostics of type of collector and jointing zones. 1 dwg, 2 tbl