Gas condensate well testing under the influence of high-velocity flow
Por:
Hernandez-G Hector, Samaniego V. Fernando, Camacho-V R.G.
Publicada:
1 ene 1993
Resumen:
This paper presents the results of a systematic study of the influence of high-velocity flow on the interpretation of transient gas condensate well test. A one dimensional radial fully implicit compositional model using the Forchheimer equation was used to obtain the results presented in this work. Drawdown and buildup tests at constant mass rate were simulated. The simulator was carefully checked, since no solutions for gas condensate flow are available in the literature that consider high-velocity flow. Among these tests, in accordance to the method of Camacho et. al., multiphase high-velocity results were graphed in terms of d ppwddlntD vs 1/(tD)1/2, presenting a positive slope, characteristic of high-velocity flow, that extrapolates correctly to the 0.5 interception value corresponding to Darcy flow. It was found that drawdown solutions graphed in terms of the sandface dimensionless pseudopressure vs log tD show for large times the characteristic one phase slope of 1.1513, as evidenced by two parallel straight lines. As expected, high-velocity effects result in an earlier appearance of the condensate phase in the reservoir. It was also found, as already mentioned, that results of this study when properly expressed in terms of pseudo-pressure show the characteristic behavior for the high-velocity monophasic flow method of Camacho et. al., which allows the estimation of the high-velocity pseudoskin factor and flow capacity. Thus, this method is also valid for conditions of this study as a diagnostic tool for high-velocity flow. It is also demonstrated that the mobility function ?t(pw) can be estimated from the derivative of the pressure data.
Filiaciones:
Hernandez-G Hector:
Inst Mexicano del Petroleo
Samaniego V. Fernando:
Inst Mexicano del Petroleo
Camacho-V R.G.:
Inst Mexicano del Petroleo