边水稠油油藏蒸汽吞吐后转冷采物理模拟研究

针对热采后期开发效果受限的边水稠油油藏，提出热采吞吐后转化学冷采的开发方式，利用高温高压三维物理模拟系统进行了边水稠油油藏物理模拟实验，研究了边水影响下蒸汽吞吐过程的温度场、转化学冷采前后的生产动态特征。结果表明，蒸汽吞吐开发边水稠油油藏的过程中，受边水侵入的影响，油层加热范围呈非对称状，随着吞吐周期的增加，边水附近的油层加热范围明显不断缩小，逐渐形成水窜通道，使得水侵区域附近的油层动用变差；油层加热范围与边水的侵入相互影响，相互制约。降黏剂起到乳化降黏、减缓水侵的作用，结合水侵规律，合理利用边水能量，转为冷采开发可提高34%的采出程度。同时，利用数值模拟确定了该技术所适用的油藏范围。该研究成果对边水稠油油藏的开发具有一定的借鉴意义。

Physical Simulation of Cold Recovery of Edge Water Heavy Oil Reservoir After Steam Stimulation

Aiming at limited effect of thermal recovery of the edge water heavy oil reservoir with,the development method of cold recovery after steam stimulation is put forward.The physical simulation experiment of heavy oil reservoir with edge water is carried out by using the high temperature and high pressure three-dimensional physical simulation system.The temperature field of the steam stimulation process under the influence of the edge water and the production dynamic characteristics before and after the chemical cold recovery are studied.The results show that in the process of steam huff and puff development of heavy oil reservoir with edge-water,the heating range of oil layer is asymmetric due to the influence of edge-water intrusion.With the increase of steam stimulation cycle,the heating range of the oil layer near the edge water is obviously shrinking,and the water channel is gradually formed,which makes the oil layer in the vicinity of the water intrusion area deteriorate.There is a mutual influence and restriction between the heating range of oil layer and the intrusion of edge-water.Viscosity reducer plays the role of emulsifying,reducing viscosity and weakening water invasion.Combined with the law of water penetration and rational utilization of edge-water energy,the recovery rate can be increased by 34%by transforming steam stimulation into cold production.At the same time,the range of reservoir suitable for this technique is determined by numerical simulation.The results of this study can be used for reference in the development of heavy oil reservoirs with edge water.