裂缝性油藏井网水驱油物理模拟研究

Experimental research on waterflooding physical simulation in well pattern
of fractured reservoir

张立强 孙雷 陈丽群 陈莹莹 董卫军

西南石油大学油气藏地质及开发工程国家重点实验室，四川 成都 610500 中国石化中原油田分公司采油二厂，河南 濮阳 457532 重庆矿产资源开发有限公司，重庆 400000

State Key Laboratory of Oil and Gas Reservoir Geology and Exploitation, Southwest Petroleum University, Chengdu 610500, China No.2 Oil Production Plant, Zhongyuan Oilfield Company, SINOPEC, Puyang 457532, China Chongqing Mineral Resources Development Co. Ltd., Chongqing 400000, China

为了更好地对裂缝性油藏进行井网优选，根据实际油藏地质特征，利用相似准则制作裂缝性油藏物理模型，开展了井网水驱油实验。通过对比不同注采井网采出程度与含水率的变化，进行井网类型优选。文中对比了5种井网的开发效果，实验及分析结果表明：对于该裂缝性油藏模型，九点井网的采收率最高，这验证了裂缝性油藏吸水能力较强的特点；其余井网的采收率从高到低依次为五点井网、排状井网、反五点井网、反九点井网，这4种井网由于强注强采，导致含水率迅速上升，驱油效果不理想，但当存在合理的裂缝分布及有效的井间干扰时，局部采油井的采收率会得到提高；可以用丁型水驱特征曲线预测该油藏的动态变化。文中的研究方法及成果对裂缝性油藏井网优选具有一定的指导意义。

In order to better optimize the well pattern of fractured carbonate reservoir, the waterflooding experiment in well pattern was carried out with physical model which was made using similarity criteria and according to the geological features of actual reservoir. The type of well pattern was optimized through comparing the changes of the recovery efficiency and water cut in different injection-production well patterns. The development effect of five kinds of well patterns was compared in this paper. The experimental and analytical results show that the recovery efficiency of nine-spot pattern is the highest for this fractured reservoir model, which verifies the stronger water absorbing ability of the fractured reservoirs. Then it is followed by five-spot pattern, row well pattern, inverted five-spot pattern, inverted nine-spot pattern. The forced injection and forced production of these four well patterns would lead to the rapid rise of water cut, whose flooding effect was not very satisfactory. However, when there is reasonable distribution of fractures or efficient cross-well disturbance, the recovery efficiency of the local oil well would be improved. The D-type water drive characteristic curves could be used to predict the dynamic changes of this reservoir model. The research methods and results in this paper have certain guiding significance on well pattern optimization of fractured reservoir.

10.6056/dkyqt201303017