A New Method for Estimating Original Hydrocarbon in-place Using Available Production Data

Material Balance calculations for determining oil or gas in-place are based on obtaining static reservoir pressures as a function of cumulative production. This requires the wells to be shut-in, in order to determine the average reservoir pressure.The Dynamic Material Balance is applicable to either constant flow rate or variable flow rate, and can be used for both gas and oil. The Dynamic Material Balance is a procedure that converts the flowing pressure at any point in time to the average reservoir pressure that exists in the reservoir at that time. Once that is done, the classical material balance calculations become applicable, and a conventional material balance plot can be generated.The procedure is graphical and very straightforward: a) knowing the flow rate and flowing sandface pressure at any given point in time, convert the measured flowing pressure to the average pressure that exists in the reservoir at that time; b) use this calculated average reservoir pressure and the corresponding cumulative production, to calculate the original oil or gas in place by traditional methods. The method is illustrated using data sets

کلیدواژه ها:

Dynamic material balance ، Pseudo steady-state condition ، Average reservoir pressure