利用水平井挖潜断层附近剩余油方法研究

Production of Remaining Oil Nearby Fault with Horizontal Well

根据建立的反映断层附近注采关系特点的概念模型并结合渗流理论知识,分析研究了断层附近剩余油的影响因素。断层避让距离是影响剩余油分布的主要因素,此外井网形式和井距对剩余油分布也会产生影响。在断层避让区域,井距越小,相同含水率时的采出程度越低,注入水突破油井排的最大距离约等于井距之半。根据水平井方案优化计算结果,利用水平井挖潜断层附近剩余油时,水平段应尽可能靠近断层,可以最大程度动用边部剩余油,井网形式要根据该区域原井网实际情况,选用联合井组或水平井井组。

According to the conceptual model reflecting the features of injection-production relations nearby fault and combined with the knowledge of percolation theory,the factors influencing the remaining oil nearby fault were studied.The avoidance distance of fault was the main factor influencing the remaining oil distribution,furthermore the well pattern shape and well spacing were also affecting the distribution of remaining oil.In the avoidance area,the smaller the well spacing was,the lower the recovery percentage was at the same water cut,the maximum distance of injected water breakthrough the well array was approximately equal to the half of well distance.Based on the optimized result of horizontal well program,when a horizontal well is used for tapping the potential nearby the fault,the horizontal section should be arranged nearby the fault as possible,thus it can maximize the marginal remaining oil,the well pattern shape should be in accordance with the situation of original well pattern and combined well pattern and horizontal group should be chosen.