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Extra info for Dynamic Well Testing in Petroleum Exploration and Development

Sample text

These parameters include formation permeability k, flow coefficient kh/m, formation pressure pR, skin factor S, and characteristics of inner and outer boundaries. Commonly used transient well test methods include pressure drawdown test, pressure buildup test, pressure fall-off test, injection well test, and multirate test. 2 Well Test Interpretation Models and Well Test Interpretation Type Curves Just as described in Chapter 1, a well test analysis model simply means using physical or mathematical methods to reproduce the hydrocarbon flow process in the actual reservoir.

5). When the sandface flow rate becomes equal to the wellhead flow rate, the flow that reflects formation conditions is completely established and radial flow starts. 1 Radial Flow Radial flow is the most frequently treated transient flow state. Assuming that the gas zone is a homogeneous, uniform thickness and that the oil/gas well has drilled the entire oil/gas zone, then after opening the well and starting up production, fluid in the reservoir will flow from the perimeter to the bottom hole along radial directions in the horizontal plane.

3 Dimensionless Quantities and Pressure Derivative Curve in Well Test Interpretation Type Curves Both ordinate and abscissa of the aforementioned type curves are dimensionless quantities or dimensionless variables. For example, dimensionless time is expressed as tD or tD/CD, dimensionless pressure as pD, and dimensionless pressure derivative as pD0. All physical quantities have their dimensions. For example, the dimension of length indicated by m is (L), the dimension of area indicated by m2 is (L2), the dimension of gas flow rate indicated by m3/day is (L3/t), and so on.

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