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By Medhat M. Kamal

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17) This can also be rewritten as: pV = mZRT , . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18) M where m is the mass and M the molecular weight of the gas. Replacing the density with the mass divided by the volume yields: U= Mp ZRT . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19) Using the above equation of state to derive the diffusivity equation governing gas flow in porous media suggests that to solve the gas diffusivity equation accurately, the pressure and the effect of pressure variation on viscosity and z-factor must be considered.

The engineer should use the diagnostic log-log plot to identify the correct semilog straight line where the pressure derivative has a slope of zero (flat line). Once the correct semilog straight line has been identified, semilog plots may be used to draw this line and compute the formation properties. However, the same information can be obtained also from the log-log diagnostic plot if the pressure derivative is not noisy. 8 Pseudosteady-State Flow Regime. Pseudosteady state refers to the flow condition in which all outer boundaries have been encountered in a closed reservoir and the formation is undergoing depletion.

These phases can be divided into · Exploration · Appraisal · Development (or production) Where the infrastructure exists to collect, treat, and dispose of produced fluids, the required equipment consists primarily of testing tools to control the well and measure well responses. On the other hand, an exploration or appraisal test requires a whole host of considerations, from hazard and operability (HazOp) equipment, special safety procedures, and disposal to fluid separation (Doublet et al. 1996).

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