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钻井过程泥浆侵入必然破坏井眼周围地层的孔隙度、渗透率结构,影响储层的电性,导致测井资料无法准确判识油气层。根据泥浆侵入的特点,分析了泥浆侵入时间与储层电性变化的关系,对比生产井注水剖面,总结了泥浆侵入剖面的特点,将以上理论与长庆油田的生产实践结合,以实例的形式阐明了泥浆侵入对双感应电阻率的影响,所造成的综合判识油水层、油水界面的问题,并提出了相应的解决方法。
Drilling mud intrusion inevitably undermines the porosity and permeability structure of the formation around the borehole, affecting the electrical properties of the reservoir, resulting in logging data can not accurately identify the reservoir. According to the characteristics of mud invasion, the relationship between the mud invasion time and the change of reservoir electrical property was analyzed. The water injection profile of production well was compared and the characteristics of mud invasion profile were summarized. Combining the above theory with the production practice of Changqing Oilfield, The effects of mud invasion on double sensing resistivity are clarified, and the problems caused by oil-water interface and oil-water interface caused by mud intrusion are clarified. Corresponding solutions are also proposed.