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Use of simultaneous flow-rate and pressure measurements to replace isochronal gas well tests

Journal Article · · SPE (Society of Petroleum Engineers) Format. Eval.; (United States)
DOI:https://doi.org/10.2118/14494-PA· OSTI ID:6531562
;
The interpretation of gas well pressure-transient tests differs from that of oilwell tests in two important respects: the nonlinearity of the governing equations and the presence of a rate-dependent (non-Darcy) skin. The nonlinearities are commonly avoided by use of pseudofunctions, and the non-Darcy skin effect is handled by use of flow-after-flow, isochronal, or modified isochronal tests. Recent investigations have shown that the simultaneous measurement of well flow rate with well pressure can significantly shorten the test duration required for accurate interpretation. These methods rely on use of the straight-line approach, however, and in some cases on trial and error. This paper describes a computer-automated interpretation approach that can be applied generally for any type curve without trial and error. The use of this interpretation technique can reduce the test duration to only that required for a standard drawdown or buildup test, and will allow the estimation of the stabilized deliverability potential without flowing the well until stabilization is reached. Examples of use of the method on both simulated and real data demonstrate its effectiveness.
Research Organization:
Stanford Univ. (US)
OSTI ID:
6531562
Journal Information:
SPE (Society of Petroleum Engineers) Format. Eval.; (United States), Journal Name: SPE (Society of Petroleum Engineers) Format. Eval.; (United States) Vol. 3:2; ISSN SFEVE
Country of Publication:
United States
Language:
English

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Related Subjects

03 NATURAL GAS
030300* -- Natural Gas-- Drilling
Production
& Processing
99 GENERAL AND MISCELLANEOUS
990220 -- Computers
Computerized Models
& Computer Programs-- (1987-1989)
COMPARATIVE EVALUATIONS
COMPUTERIZED SIMULATION
FLOW MODELS
FLOW RATE
FLUID MECHANICS
FORMATION DAMAGE
GEOLOGIC MODELS
HYDRODYNAMICS
MATHEMATICAL MODELS
MECHANICS
NATURAL GAS WELLS
OIL WELLS
PRESSURE MEASUREMENT
SIMULATION
TESTING
WELLS