THAI技术开发厚层稠油油藏井网参数优选

Parameter optimization of well pattern for heavy oil reservoir with thick layer exploited by THAI technology

厚层稠油油藏原油黏度高、埋藏深、油藏流体流动性差、动用程度低,采用THAI(从端部到跟部注空气)技术可提高该类油藏的采收率。通过数值模拟对排状布井方式的井网参数进行优选,得出影响因素的敏感性强弱依次为生产井水平段长度、注气量、井距、注气井到生产井水平段端部的距离。在此基础上,进一步分析厚层稠油油藏中不同布井方式的开发效果。结果表明:随着燃烧前缘向前推进,生产井中会产生气窜通道;方案2VIHP的采油速度和采收率优于其他方案;层厚是影响热量传递的重要因素;垂直注气井的开采效果优于水平注气井。

Usually, the heavy oil reservoir with thick layer has high crude oil viscosity, buried depth, poor reservoir fluid mobility and low degree of oil producing. THAI （Toe to Heel Air Injection） technology is an effective EOR technology, The development parameters of row well pattern were optimized by numerical simulation. It is shown that the sensitivity strength of influencing factors in the order were the horizontal section length of production wen, gas injection volume, well spacing and the distance from injection well to production well. On the basis, the developing effect of different well pattern in heavy oil reservoir with thick layer was further studied. The results show that gas breakthrough will happen as the burning front moves forward. The oil production rate and recovery factor for Scheme 2 are superior to others. Layer thickness is one of the important factors affecting heat transfer. The development effect of vertical injection well is better than that of horizontal injection well.