Well test analysis for wells produced at a constant pressure
Thesis/Dissertation
·
OSTI ID:6036824
Conventional well test analysis has been developed primarily for constant flow rate production. Constant pressure production results in a transient rate response. Pressure buildup after constant pressure flow is complicated by the transient rate prior to shut-in. Thus, the methods of draw-down and buildup analysis designed for constant rate production are not valid for constant pressure production. Some transient rate analysis methods are outlined in the literature but a thorough study is lacking. The necessary analytical solutions for determination of reservoir permeability and porosity and wellbore skin factor are provided in this study. Reservoir limit testing and interference analysis are also discussed. In addition, analysis of flow at constant wellhead pressure is shown to be a simple extension of the existing theory for constant wellbore pressure production. Most of the existing methods for pressure buildup analysis for wells with a constant pressure flow history are empirical. In this work, the method of superposition in time of continuously changing rates is used to generate an exact solution for pressure buildup following constant pressure flow. The method is general. Wellbore storage and skin effects are incorporated into the theory, and both bounded and unbounded reservoirs are considered. Buildup solutions are graphed using conventional techniques for analysis. Horner's method for plotting buildup after variable rate flow is found to be accurate in a majority of cases. Curves for determination of static reservoir pressure similar to those developed by Matthews, Brons, and Hazebroek are provided for closed bounded reservoirs. Additional applications of the method of superposition in time of continuously changing rates are also included.
- OSTI ID:
- 6036824
- Country of Publication:
- United States
- Language:
- English
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