测-渗-测中子寿命测井在大庆油田的应用

测-渗-测中子寿命测井通过注硼或钆溶液将井筒内液体替换后,在一定的压力下硼或钆溶液渗透到地层内部,增大地层可动水的热中子宏观俘获截面,测量井筒内液体替换前后地层宏观俘获截面的变化而达到评价地层剩余油饱和度的目的.测-渗-测中子寿命测井施工工艺是该测井方法确定高含水层位和窜槽层位的重要方面,施工工艺主要包括替换液体的施工压力、测井时间,其中施工压力是获得真实可靠测井资料的关键因素.对施工过程中压力因素的影响进行了分析,并介绍了该测井方法在大庆油田的应用效果.

Applications of Log-Penetration-Log Neutron Lifetime Logging in Daqing Oilfield

In log-penetration-log neutron lifetime logging, liquids in the borehole are replaced by Boron-Gadolinium solution, after which the solution penetrates into formation under a certain pressure to enlarge thermal neutron macro-capture cross section of the movable formation water;and then, we can measure changes of formation macro-capture cross section before and after the replacement of fluids in the borehole for the purpose of evaluation of remaining oil saturtion. Log-penetration-log neutron lifetime logging technology is an important part in determining high water-bearing layers and channeling layers.This technology includes fluid displacement pressure and logging time, among which the displacement pressure (e.g.,replacement pressure and penetration-supporting pressure) is the key factor in obtaining exact and reliable log data.Effects on the pressures are analysed. Application results about this technology are given.