注硼中子寿命测井在吐哈油田的改进与应用

Improvement of Boron-injected Neutron Lifetime Logging Technology and Its Application in Tuha Oilfield.

吐哈油田非均质性强且具有低孔、低渗、低矿化度特性 ,一些常规评价水淹层的测井方法受到限制。注硼中子寿命测井在吐哈油田的应用过程中 ,通过时间推移测井和工艺优化试验从 5个方面进行了技术攻关 ,即合理控制压井、优化硼酸用量和浓度、确定合理注硼压力、总结硼酸渗吸扩散规律和确定最佳测井时间。影响注硼中子寿命测井的因素较多 ,应根据区块油藏情况进行解释模型及参数优化 ,结合油藏动静态资料进行综合评价。在吐哈丘陵油田采用改进后的工艺测井 6口 ,找水符合率达80 % 。

Tuha Oilfield is a heterogeneous reservoir with notable characteristics of low porosity, low permeability and low salinity. It is difficult for conventional lifetime logging methods to evaluate waterflooded zones. Boron injected neutron logging hfas been quickly developed in recent years for watered out reservoir.In the application of Tuha Oilfield, by time lapse logging and optimizing the technologys measures,five aspects of applying boron injected neutron lifetime logging technology are improved,i.e.reasonably controlling kill job, choosing proper acid used amount and density, determining boron injecting pressure, summarizing the law of imbibition and diffusion, and determining logging time.There are many factors impacting on the use of boron injected neutron lifetime logging, so comprehensive interpretation should be performed combined with the conditions of reservoir and dynamic & static data. Six wells in Qiuling Oilfield are logged with the above technology, the waterlocating agreement of which is up to 80%.