基于生产动态数据的产水气井水锁伤害预测数学模型

A mathematical model for predicting water-lock damage in water producing gas wells based on dynamic production data

为了解决水驱气藏储层水锁损害定量预测的问题,基于气水渗流理论,建立了适用于产水气井的水锁伤害预测理论模型。研究结果表明:气井水锁效应主要会对气相相对渗透率造成显著影响,储层水锁伤害不仅取决于储层物性,而且受制于气井的生产时间、工作制度、开发方式等因素;其次,气井水锁表皮系数随产水气井生产时间的增加而增大,气井水锁损害程度随着气井生产时间的增加而不断加深,上述指标能够量化产水气井在开发中后期由边水侵入导致的气井水锁伤害。本文理论推导的衡量气井水锁伤害的指标,能够客观反映产水气井控制范围内的储层流体整体渗流特性及气井水锁动态,但是计算结果对气井生产数据与动态监测资料的依赖性较强。

Based on the theory of gas-water seepage,a water lock damage prediction model suitable for water-producing gas wells is established in order to solve the problem of quantitative prediction of water lock damage in water-driven gas reservoirs.The results show that the water lock effect of gas well mainly has a significant impact on the relative permeability of gas phase,and the water lock damage of reservoir not only depends on the physical properties of the reservoir,but also depends on the production time,working system and development mode of the gas well.In addition,the skin coefficient of gas well water lock increases with the increase of production time of water producing gas well,and the damage degree of gas well water lock is deepened with the increase of production time of gas well.The above indexes can quantify the water lock damage of gas well caused by edge water intrusion in the medium and later stages of development of water producing gas well.The index derived in this paper can objectively reflect the overall seepage characteristics of reservoir fluid and the water lock behavior of gas wells within the control range of water-producing gas wells,but the calculation results are highly dependent on the production data and dynamic monitoring data of gas wells.