Application of pseudotime to buildup test analysis of low-permeability gas wells with long-duration wellbore storage distortion
An imporved method is presented for analyzing pressure transient tests in low-permeability gas wells that is based on a nonlinear form of the diffusivity equation rather than the linear form associated with liquid flow. This review delineates a theoretical basis for plotting pseudopressure changes against elapsed pseudotime to obtain a curve that in some cases corresponds to a type curve derived for a slightly compressible liquid with constant wellbore storage. Computer simulated tests and field data both support the theoretical results, suggesting that (1) the use of both pseudotime and pseudopressure yields linear equations for modeling gas flow in reservoirs and (2) types curves developed for slightly compressible liquids with unchanging wellbore storage constants can be used for gas well tests following large pressure drawdowns if analyzed using pseudotime and pseudopressure.
- Research Organization:
- Texas A and M Univ., College Station
- OSTI ID:
- 6431102
- Journal Information:
- J. Pet. Technol.; (United States), Journal Name: J. Pet. Technol.; (United States) Vol. 34; ISSN JPTJA
- Country of Publication:
- United States
- Language:
- English
Similar Records
A numerical study of the pseudotime transformation for drawdown in the infinite-acting period
Pseudotime function improves gas well analysis