多层合采油藏分层测试新方法可行性分析  

Feasibility analysis of testing method on multilayer commingled oil reservoir

作　　者：隋微波[1] 张士诚[1] 

机构地区：[1]中国石油大学(北京)石油工程教育部重点实验室,北京102249

出　　处：《油气地质与采收率》2010年第5期90-94,共5页Petroleum Geology and Recovery Efficiency

基　　金：国家科技支撑计划项目"低(超低)渗油气田高效增产改造和提高采收率技术与产业化示范"(2007BAB17B03)

摘　　要：实时井下温度和压力传感器目前已经成为国外许多陆上和海上油田智能完井的必要组成部分,成为进行动态油藏监测的重要手段之一。针对井下传感器这一新型井下测量工具的广泛应用,提出了一种针对多层油藏分层属性测试的新方法,即应用井下温度传感器代替传统的分层测试中的流量计,用实时温度测量代替反复多次的生产测井作业。针对新提出的测试方法建立了井筒—油藏耦合的数学模型,并应用数学模型探讨了该方法的可行性。通过对不同分层伤害表皮系数和分层渗透率分布的计算和分析,发现多层油藏中井筒流体的温度主要受2大机理控制:一是各产层之间的渗透率差异,这种差异主要影响各产层间的流量分配;二是产层中由于地层伤害引起的压力梯度差异,基于焦耳—汤姆森效应,近井地带的压力梯度变化会引起明显的温度变化,这种温度变化将对确定各产层地层伤害情况起决定性作用。研究认为,井筒流体的瞬态温度变化对多层油藏的分层属性差异很敏感,该方法是具有研究可行性的,并且其对于中国陆上和海上油田采用井下温度和压力传感器及进一步进行智能井完井具有很好的推动作用。Real-time downhole temperature and pressure sensors have become necessary components of intelligent-well completions in many foreign onshore and offshore oilfields. Downhole sensor is one of the most important tools for reservoir surveillances. With the fact that downhole sensors are employed widely as new downhole measurement tools,this paper presents a brand-new technical idea for multilayer transient testing. The new approach is proposed to substitute the flowmeter on the production logging tools with downhole temperature sensors,and to substitute multiple production logs with real-time temperature measurements. The authors established the mathematical wellbore-reservoir coupled model for the proposed testing approach,and discussed the feasibilities. By means of calculating and analyzing different cases with formation property variations,we believe that the transient wellbore fluid temperature is sensitive to multilayer formation properties variations. Therefore, this new testing idea is feasible to be studied further. Detailed testing procedure and interpretation methods will be delivered in future. This research work will greatly promote the application of downhole sensors and further intelligent-well completions for fields onshore and offshore in China.

关 键 词：井下传感器 多层油藏 分层测试 井筒流动模型 油藏流动模型 温度模型 焦耳-汤普森效应 

分 类 号：TE353.1[石油与天然气工程—油气田开发工程]