| 摘要 |
The volume of gas (Vg) in the drilling fluids is the slope of a ratio measured between the gas volume produced and the corresponding volume of rock drilled. The volume of oil (Vo) is determined by measuring the proportion of organic carbon (TOC) in the drilled rock. The volume ratio (GOR) is the ratio between the determined volumes of gas and oil The volume of oil (Vo) is determined by measuring the amount of organic carbon (TOC) in the drilled rock taking into account physical characteristics of the drilled rock and of the oil in the surface conditions. The ratio (SPI) of a volume of gas produced at the surface to the same volume of rock drilled is evaluated taking into consideration the concentration of gas in the drilling fluids, the drilling fluid flows in circulation, the rate of penetration of the drilling tool and the diameter of the hole drilled. The volume ratio (GOR) is determined by the formula GOR = SPI/((TOC/100).k.(rhor/rhoo)) where rhoo is the density of the liquid hydrocarbon at the surface (generally estimated at 0.8), rhor is the estimated density of the rock, phi is the porosity of the rock and k is the ratio between % weight of oil and carbon in the rock drilled. |
