Drawdown behavior of gravity drainage wells [electronic resource].
- Published
- Washington, D.C. : United States. Dept. of Energy, 1993.
Oak Ridge, Tenn. : Distributed by the Office of Scientific and Technical Information, U.S. Dept. of Energy. - Physical Description
- 74 pages : digital, PDF file
- Additional Creators
- United States. Department of Energy and United States. Department of Energy. Office of Scientific and Technical Information
Access Online
- Restrictions on Access
- Free-to-read Unrestricted online access
- Summary
- An analytical solution for drawdown in gravity drainage wells is developed. The free-surface flow is viewed as incompressible, and anisotropy effects are included. The well is a line source well, and the reservoir is infinitely large. The model is valid for small drawdowns. The uniform wellbore potential inner boundary condition is modelled using the proper Green`s function. The discontinuity at the wellbore is solved by introducing a finite skin radius, and the formulation produces a seepage face. The calculated wellbore flux distribution and wellbore pressures are in fair agreement with results obtained using a numerical gravity drainage simulator. Three distinct flow periods are observed. The wellbore storage period is caused by the moving liquid level, and the duration is short. During the long intermediate flow period, the wellbore pressure is nearly constant. In this period the free surface moves downwards, and the liquid is produced mainly by vertical drainage. At long times the semilog straight line appears. The confined liquid solutions by Theis (1935) and van Everdingen and Hurst (1949) may be used during the pseudoradial flow period if the flowrate is low. New type curves are presented that yield both vertical and horizontal permeabilities.
- Report Numbers
- E 1.99:doe/bc/14899--8
E 1.99: supri-tr--97
supri-tr--97
doe/bc/14899--8 - Subject(s)
- Other Subject(s)
- Note
- Published through SciTech Connect.
10/01/1993.
"doe/bc/14899--8"
" supri-tr--97"
"DE93000175"
"AC1505100"
Ramey, H.J. Jr.; Aasen, J.A.
Stanford Univ., CA (United States). Petroleum Research Inst. - Type of Report and Period Covered Note
- Topical; 12/31/1993 - 12/31/1993
- Funding Information
- FG22-93BC14899
View MARC record | catkey: 14704497