The pressure of a reservoir is the key driving force for the primary recovery of hydrocarbon. It gives an indication of the amount of hydrocarbon remaining in the reservoir at any given time. Three types of pressure regime is encountered during the drilling process; which are the normal, abnormal and the subnormal pressure. During production of the hydrocarbon, as soon as the well is open to flow, the reservoir pressure starts declining, depending on the drive mechanism of the reservoir and at any point in time, the average value of pressure is estimated. In this chapter, solved example questions on determination of fluid contacts from pressure survey data and averaging of reservoir pressures are presented. In addition, the position of the reservoir fluid contact is not static as the fluid is produced. At first, the position of the fluid contacts are first determined within control wells and then extrapolated to other parts of the field. Once initial fluid contact elevations in control wells are determined, the contacts in other parts of the reservoir can be estimated. Hence, the various methods of estimating reservoir fluid contact are presented with solved example questions.
Fluid gradient Oil-water contact Hydrocarbon Gas-oil contact Fluid contact Pressure regime Repeat formation tester Average pressure Drill stem test
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