马王庙油田敏感性储层注水开发的经验与教训

马王庙油田含油层位为下第三系新沟咀组下段，储层敏感性较强，注水开发过程中，储层敏感性的表现是随着注水时间的延长，注水压力上升，油层吸水能力下降，注水井周围地层压力不断上升。针对这种现象，在研究储层特征的基础上，模拟矿场注水条件，进行不同条件下的岩心水驱实验。实验结果表明，岩心水驱后，空气渗透率损失10.2%-34.6%，水测渗透率下降80%以上。水驱前后岩心对比测试表明，水驱后孔隙结构变差。通过相同储层、不同区块注水开发效果的对比分析，综合室内研究结果，总结出敏感性储层注水开发的经验和教训。

Experiences and Suggestions for Waterflooding Development in Sensitive Reservoir in Mawangmiao Oilfield

Mawangmiao oilfield has a hypersensitive reservoir which is located in Yuekou symon fault in Jianghan Basin, and its oil bearing formation is lower segment of Xingouzhui formation, Palaeogene system. In the course of waterflooding development, the waterflooding pressure of the oil pool increases along with prolonging the time of water injection, meanwhile the ability of absorbing water for the oil layers decreases, and the stratum pressure around the injecting wells rises ceaselessly. The analysis of blocked state in the bottom of the wells indicates that the strata around the shafts of asorbing wells are blocked seriously. Basing on the research of reservoir characteristics, the simulative experiments in different conditions show that the permeability loses 10 2%-34 6% at atmosphere, and decreases more than 80% in water after the water is injected into these cores. The comparison of test data points out the pore structure is worse after the water is injected into the cores than before. Through the comparison of waterflooding development effect in the same reservoirs and different blocks, combining the experiment result, some experiences and suggestions are given out for the waterflooding development in sensitive reservoir.