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南三区西部套损主要原因有三个:一是密集断层等地质构造引起的异常高压区,二是由于高压注水导致严重的注采压力不平衡,另外就是近些年出现的投入聚驱开发后导致的葡Ⅰ组的套损。本文针对注采压力不平衡诱发SⅡ4以上层段套损,将整个萨南油田水驱区块作为研究对象,以物质平衡原理与Logistic旋回理论相结合,对合理注采比的确定方法进行了研究:研究了压力恢复速度与注采比、含水的关系。最后应用该方法确定了南三区西块目前开发的合理注采比,并通过对SⅡ4及以上层段注水量调整,合理调整区块注采系统。
There are three main reasons for the casing loss in the western part of the south three areas: one is the abnormal high pressure zone caused by geological structures such as intensive faults, and the other is due to the imbalance of injection and production pressure caused by high pressure water injection. In addition, in recent years, Lead to the Portuguese Ⅰ sets of sheath damage. In this paper, aiming at the casing damage caused by the imbalance of injection and production, the water flooding block in the whole Sanan oilfield is taken as the research object. Based on the material balance principle and the Logistic cycle theory, the determination method of rational injection-production ratio is studied : The relationship between pressure recovery rate and injection-production ratio and water content was studied. Finally, this method is used to determine the reasonable injection-production ratio currently developed in the western block of Nansi District. By adjusting the water injection volume in SⅡ4 and above, the injection and recovery system of blocks is reasonably adjusted.