Plugging Mechanism and Compatibility Evaluation of Injected Production Water to Reservoir Core
Taking an oilfield in southwest China as an example,the effects of suspended particles,oil and chemical ions in production water on reservoir core plugging were investigated comprehensively.The results showed that the higher the volume of injected water displacement,the higher the damage degree of core.With the increase of core grade,the damage degree of chemical blockage to the core decreased step by step,and the damage rate of the core below 100 mD was more than 20％.The contribution of physical factors to core plugging of 10 to 50 mD,50 to 100 mD and 100 to 300 mD in different platforms was 6.45,14.89,6.67 and 3.15 times of the contribution of chemical factors,respectively.The permeability retention rates of two natural and artificial cores of the same grade after displacement were not much different,which indicated that the injected fluid had a good compatibility with the rock,but the long-term water flooding was more harmful to the core(especially the low-permeability core).
offshore oilfieldproduction water injectioncore pluggingfluid and rock compatibility
万方数据
维普
