硼中子寿命测井技术在吐哈油田低孔低渗储层剩余油评价中的应用——硼中子寿命测井工艺技术实验研究

An application of Boron Neutron log to estimation of remaining oil in low-porosity and low-permeability reservoirs in Tuha oilfield

吐哈油田低孔低渗储层约占总储层的 2 / 3,用常规测井技术进行剩余油评价一直未取得较好效果 ,为此开展了用硼中子寿命测井技术进行剩余油评价的应用研究。针对吐哈油田实际情况 ,提出将传统工艺方式“测—注—测”改为“测—扩散—测” ,并通过增大硼酸液浓度、在硼酸液中添加活性剂、时间推移测井及钆液代替硼酸液的中子寿命测井等一系列实验 ,对工艺参数进行了进一步优化。共测试了 5 7口井 ,在油、水层识别方面取得了很好的效果。

About two thirds reservoirs are in low_porosity and low_permeability in Tuha oilfield, where the conventional log techniques have not gotten good results in estimation of remaining oil, and the application of Boron Neutron log is studied. According to the special situation in Tuha oilfield, we have changed the logging technology from traditional “log-inject- log” to “log-diffuse-log”, and further optimized parameters of the technology by several tests, such as increasing boric acid concentration in fluid, adding activating agent to boric acid fluid, making time_lapse logging and substituting boric acid fluid by gadolinium fluid. Totally 57 wells have been tested and a good result has been achieved in identification of oil and water beds.