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(气藏工程学英文版课件）Chapter5 Pressure-Transient Testing of Gas Wells[精品]
* Pseudopressure and pseudotime provide excellent results when using analysis methods for slightly compressible liquids to analyze gas well tests. However, they are inconvenient for two reasons. 1) The units of pseudopressure and pseudotime are such that the numeric values of these variables will often be in the range of 105 to 109. 2) The use of pseudopressure and pseudotime requires separate sets of equations for oil and gas wells for each type of analysis to be performed. Adjusted pressure and adjusted time are defined by multiplying pseudopressure and pseudotime by constants. This gives the new variables the same units, and similar ranges, as pressure and time, respectively. The equations for analysis of gas well tests in terms of adjusted pressure and adjusted time are quickly obtained from those for analysis of oil well tests by simple substitutions. Nomenclature: The i subscript indicates that property is to be evaluated at initial reservoir pressure. Other reference pressures (such as current average drainage area pressure) may also be used. * Nomenclature p - absolute pressure, psi pp - real gas pseudopressure, psi2/cp p0 - base pressure, psi. Arbitrary; often taken to be 0 or atmospheric pressure z - real gas compressibility factor, dimensionless ? - gas viscosity, cp * This figure shows the behavior of the term p/?z with pressure at 200 deg F, for different gas gravities. The term p/?z is fairly constant at high pressures, greater than approximately 3000 psi. * Nomenclature p - absolute pressure, psi pp - real gas pseudopressure, psi2/cp p0 - base pressure, psi. Arbitrary; often taken to be 0 or atmospheric pressure z - real gas compressibility factor, dimensionless ? - gas viscosity, cp * This figure shows the behavior of the term ?z with pressure at 200 deg F, for different gas gravities. The term ?z is fairly constant at low pressures, less than approximately 2000 psi. * The choice of dependent variable depends on the situation. If you are usi
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