Abstract

This paper presents a gas-water two-phaseLaminar-Inertial-Turbulent (LIT) flow equation for watered-out gas wells, which can be solved through the incorporation of daily production, gas-water relative permeability and PVT data, and then Q_AOF and formation factor (Kh) are obtained. Field case study in Long Wang Miao (LWM) water-drive gas reservoir shows that for watered-out gas wells, the single-phase LIT equation can result in overestimation of Q_AOF by 30–80%. Water invasion performance can be relieved after reducing the production rate of watered-out gas wells, and water invasion behavior before breakthrough can be diagnosed with the decline trend of Kh values.

摘要

本文提出了枯竭气井的气水两相层流-惯性湍流（LIT）流动方程，该方程可通过合并日产量，气水相对渗透率和PVT数据，然后求解Q _AOF来求解。得到形成因子（Kh）。在龙王庙（LWM）水驱气藏的现场案例研究表明，对于已注水的气井，单相LIT方程可导致Q _AOF的高估30％至80％。降低已注水的气井的产量后，可以减轻水的入侵性能，并且可以通过Kh值的下降趋势来诊断突破前的水入侵行为。