Decline Curve Analysis

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2 .Decline Curve Analysis:- 2-1 Use and Application of Decline Curve Analysis:- Decline curve analysis results in confidence estimates of ultimate recovery by extrapolation of performance trends. It is used to determine the remaining oil reserves and the remaining production life for the cumulative production. Time is normally selected as independent variable for extrapolating purposes. The following variables (rate, pressure, water cut) must be a continuous function of the independent variable and change in some uniform manner. Reserves:- Reserves are estimated volumes of crude oil, condensate, natural gas, natural gas liquid, and associated substances anticipated…show more content…
Speculative, potential, or prospective reserves are not acceptable in this reserves category. Possible reserves have a higher degree of uncertainty than do proven or probable reserves [4]. . The reserve value is dependent on the "economic limit" which is defined as " the time of abandonment of a project presumably will occur when the net profit becomes zero or trivial, and sale or salvage is more attractive than continuing operation ". An economic limit must be projected for planning and devaluation…show more content…
This makes it possible to equate the expansion of the reservoir fluids upon pressure drop to the reservoir vodage caused by draw of oil, gas, and water minus the water influx. Successful application of this method requires an accurate history of the average pressure of the reservoir. As well as reliable oil –gas and water –production data and (PVT) data on the reservoir fluids, if sufficient pressure and production performance data are recorded and (PVT) data describing the reservoir fluid behavior is available. The amount of oil or gas in place in a reservoir sometimes may be the computed by material balance
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