矿场密闭取心与室内模拟的驱油效率分析  

Analysis of displacement efficiency of field pressure coring and lab test

作　　者：兰玉波[1] 赵永胜[2] 魏国章[2] 

机构地区：[1]大庆石油学院石油工程学院,黑龙江大庆163318 [2]大庆油田有限责任公司勘探开发研究院,黑龙江大庆163712

出　　处：《大庆石油学院学报》2005年第4期43-45,共3页Journal of Daqing Petroleum Institute

摘　　要：基于室内实验采用的均质岩心与检查井强水洗段崖性物性较好的相似性，通过对水淹区密闭取心检查井强水洗段驱油效率形成，室内水驱油模拟条件的分析，指出了密闭取心与室内水驱油效率差别的原因，得出导致大市场密闭取心井驱油效率高的原因：一是特高的注水倍数，二是特低的临界驱动比，三是取心过程中高黏度流体的大压差驱动。天然岩心室内长期水冲刷实验证实了密闭取心的水驱油效率可达80%～90%。Based on the preferable comparability of lithology between homogeneous core used in lab test and that in strongly water washing part of inspection wells, forming condition of displacement efficiency in strongly water washing part of pressure coring inspection wells in waterflooded area has been analyzed, and reasons for the difference of displacement efficiency between pressure coring and in-house waterflood test have been discussed. The paper points out that the reasons for displacement efficiency improving of pressure coring well are as follows: Firstly, extra-high injection multiples; secondly, extra-low critical drive ratio; thirdly, high velocity fluid's big differential pressure drive during the process of coring. Besides, the natural core in-house long-term washing out experiment has proved that waterflood efficiency of pressure coring can reach as high as 80%～90%.

关 键 词：岩心 检查井 驱油效率 注水倍数 驱动比 室内模拟 

分 类 号：TE357[石油与天然气工程—油气田开发工程]