Transient pressure behavior in a cylindrical reservoir produced by a well at constant bottom-hole pressure
An investigation of the pressure behavior (drawdown and buildup) was made on a well producing a slightly compressible fluid at a constant bottom-hole pressure and located in a reservoir which is either infinite or finite (closed or constant pressure drive). This work employs a numerical (finite difference) model, which maintains a one-to-one correspondence between the constant well-bore pressure and constant flow rate cases. Solutions of the well-bore flow rate vs. time obtained by previous workers are discussed. Then, the validity of the effective well-bore radius concept is conclusively established. Finally, the average reservoir pressure is correlated as a function of flowing time and reservoir size. The effect of the reservoir size and production time prior to shut in, on the slope of the straight line graphs was studied, and methods to determine average reservoir pressure are discussed. The effects of well-bore damage and well-bore storage on the buildup data are studied. The pressure behavior at an observation well (interference testing) during the flow period was studied. A new type curve is presented for analyzing interference data. Criteria for using the cosntant rate type curves are given. 59 references.
- OSTI ID:
- 5810575
- Resource Relation:
- Other Information: Thesis
- Country of Publication:
- United States
- Language:
- English
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