GASCAP DRIVE
A typical gascap drive reservoir is shown in fig. 3.6. Under initial conditions the oil at the gas oil contact must be at saturation or bubble point pressure. The oil…
THE MATERIAL BALANCE EXPRESSED AS A LINEAR EQUATION
Since the advent of sophisticated numerical reservoir simulation techniques, the Schilthuis material balance equation has been regarded by many engineers as being of historical interest only; a technique used back…
GENERAL FORM OF THE MATERIAL BALANCE EQUATION FOR A HYDROCARBON RESERVOIR
The general form of the material balance equation was first presented by Schilthuis1 in 1941. The equation is derived as a volume balance which equates the cumulative observed production, expressed…
DETERMINATION OF THE BASIC PVT PARAMETERS IN THE LABORATORY
These additional measurements will be briefly discussed in section 2.6. For the moment, the essential experiments required to determine the three basic parameters will be detailed, together with the way…
COLLECTION OF FLUID SAMPLES
Samples of the reservoir fluid are usually collected at an early stage in the reservoir's producing life and dispatched to a laboratory for the full PVT analysis. There are basically…
DEFINITION OF THE BASIC PVT PARAMETERS
The Pressure−Volume−Temperature relation for a real gas can be uniquely defined by the simple equation of state in which the Z−factor, which accounts for the departure from ideal gas behaviour,…
HYDROCARBON PHASE BEHAVIOUR
This subject has been covered extensively in specialist books8,13,18 and is described here in a somewhat perfunctory manner simply to provide a qualitative understanding of the difference between various hydrocarbon…
GAS MATERIAL BALANCE: RECOVERY FACTOR
The material balance equation, for any hydrocarbon system, is simply a volume balance which equates the total production to the difference between the initial volume of hydrocarbons in the reservoir…
APPLICATION OF THE REAL GAS EQUATION OF STATE
The determination of the Z−factor as a function of pressure and temperature facilitates the use of the simple equation to fully define the state of a real gas. This equation…
The Z-factor correlation of Standing and Katz
This correlation requires a knowledge of the composition of the gas or, at least, the gas gravity. Naturally occurring hydrocarbons are composed primarily of members of the paraffin series (CnH2n+2)…
