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多层合采油藏分层测试新方法可行性分析 被引量:2
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作者 隋微波 张士诚 《油气地质与采收率》 CAS CSCD 北大核心 2010年第5期90-94,共5页
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... 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。 展开更多
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
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Nonlinear flow numerical simulation of low-permeability reservoir 被引量:2
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作者 于荣泽 卞亚南 +3 位作者 周舒 王楷军 吕琦 陈朝辉 《Journal of Central South University》 SCIE EI CAS 2012年第7期1980-1987,共8页
A nonlinear flow reservoir mathematical model was established based on the flow characteristic of low-permeability reservoir.The well-grid equations were deduced and the dimensionless permeability coefficient was intr... A nonlinear flow reservoir mathematical model was established based on the flow characteristic of low-permeability reservoir.The well-grid equations were deduced and the dimensionless permeability coefficient was introduced to describe the permeability variation of nonlinear flow.The nonlinear flow numerical simulation program was compiled based on black-oil model.A quarter of five-spot well unit was simulated to study the effect of nonlinear flow on the exploitation of low-permeability reservoir.The comprehensive comparison and analysis of the simulation results of Darcy flow,quasi-linear flow and nonlinear flow were provided.The dimensionless permeability coefficient distribution was gained to describe the nonlinear flow degree.The result shows that compared with the results of Darcy flow,when considering nonlinear flow,the oil production is low,and production decline is rapid.The fluid flow in reservoir consumes more driving energy,which reduces the water flooding efficiency.Darcy flow model overstates the reservoir flow capability,and quasi-linear flow model overstates the reservoir flow resistance.The flow ability of the formation near the well and artificial fracture is strong while the flow ability of the formation far away from the main streamline is weak.The nonlinear flow area is much larger than that of quasi-linear flow during the fluid flow in low-permeability reservoir.The water propelling speed of nonlinear flow is greatly slower than that of Darcy flow in the vertical direction of artificial fracture,and the nonlinear flow should be taken into account in the well pattern arrangement of low-permeability reservoir. 展开更多
关键词 low-permeability reservoir nonlinear flow mathematical model numerical simulation
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