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在油井实时监测技术模型的基础上,建立气井酸化实时监测模型及其求解,从测量的压力和流体速率中开发出的注入能力倒数与时间叠加函数来跟踪地层的伤害变化。由于油气粘度的差异,注入液和气藏流体之间粘度差带来较大的误差,为了修正这种差异,着重考虑了酸液带来的粘滞效应。从注酸过程中记录的注入速率和压力所获得的总表皮系数中减去利用注入酸的体积函数而计算出来的粘滞表皮系数,即可获得酸化过程中的真实表皮系数。
Based on the oil well real-time monitoring technology model, a gas well acidizing real-time monitoring model and its solution are established. The injection damage reversal and time stacking function developed from the measured pressure and fluid velocity are used to track the formation damage changes. Due to the difference of oil and gas viscosity, the viscosity difference between injection fluid and gas reservoir fluid brings great error. In order to correct this difference, the viscous effect caused by acid solution is mainly considered. The true skin factor in the acidification process is obtained by subtracting the viscous skin factor calculated by the volumetric function of injected acid from the total skin factor obtained from the injection rate and pressure recorded during the acid injection.