APPLICATION OF MASS BALANCE IN PUMPING WELL ANALYSIS.
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This study demonstrates that improper application of the mass balance equation (MBE) may lead to serious errors in estimating the annular gas rate and the flowing BHP. The inaccuracy stems from lack of knowledge of the true annular gas rate when the MBE is applies to the total gas in the system (tubing and annulus). Because only a fraction of the total gas is produced through the annulus, and actual annular gas rate is not known beforehand unless measured at the surface. The method suggested in this work develops the MBE for the gas phase in the annulus only, thereby avoiding the problem. The flowing BHP can be estimated by conducting a short buildup test and extrapolating the buildup data to zero time.
JPT, Journal of Petroleum Technology
author list (cited authors)
Kabir, C. S., & Hasan, A. R.
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