断块油藏中阶梯水平井的渗流特性  

Seepage characteristics of stepped horizontal wells in fault-block reservoirs

作　　者：任岚[1] 赵金洲[1] 胡永全[1] 孙健[1] 

机构地区：[1]西南石油大学油气藏地质及开发工程国家重点实验室,四川成都610500

出　　处：《石油学报》2011年第1期107-112,共6页Acta Petrolei Sinica

基　　金：国家自然科学基金项目(No.50774064)资助

摘　　要：根据流体力学和渗流力学的相关理论,考虑阶梯水平井穿越3个独立断块油层的情况,建立了阶梯水平井井筒管流与地层渗流耦合的数学分析模型。在该模型中,对于水平生产段,采用质量守恒原理和微元线汇理论,分析了沿程流入对井筒内压降的影响,导出了阶梯水平井井筒内生产段的压降计算公式;对于各个油层之间的连接段,建立了不同曲率半径情况下的压降计算方法。同时,考虑了阶梯水平井穿越的断块油层具有不同的生产能力,推导并提出了数学模型的求解方法,并编制了相应的计算程序。利用该分析模型,可以求解阶梯水平井井筒沿程压力分布及产量分布。模拟计算表明,阶梯水平井在生产时,产量受各个油层的生产能力和水平井筒的摩阻共同影响,且物性较好的储层在水平井的跟端,物性较差的储层在水平井的指端对开采较有利。Base on theories related to fluid mechanics and seepage mechanics,a mathematical analysis model that couples the wellbore conduit flow and formation seepage was established to deal with the situation that a stepped horizontal well traverses three independent fault-block oil layers.Based on the mass conservation law and micro-unit line-congruence theory,the model analyzed the influence of inflow on the pressure drop within wellbore for horizontal production sections and educed an equation to calculate the pressure drop of a production section in stepped horizontal wellbore.A method to calculate the pressure drop under the condition of different curvature radius was proposed for linking sections of various oil layers.Meanwhile,since different fault-block oil layers traversed by a stepped horizontal well have different production capacity,the resolution based on a mathematical model was educed along with a corresponding computing program.With the utilization of this analysis model,the distribution of on-way pressure of stepped horizontal wellbore as well as the output at different positions could be predicted.The analog computation indicated that the output was influenced both by the production capacity of each oil layer and by the flow friction of horizontal wellbore,moreover,it is more favorable to exploitation if oil layers with better and worse physical properties were located,respectively,at the heel and toe of horizontal wells.

关 键 词：阶梯水平井 断块油藏 地层渗流 井筒管流 质量守恒原理 微元线汇理论 

分 类 号：TE347[石油与天然气工程—油气田开发工程]