考虑储层非均质时注汽井内蒸汽流动规律  

Steam flow law in horizontal wells when considering reservoir heterogeneity

作　　者：李端 林日亿[1] 王新伟[1] LI Duan;LIN Riyi;WANG Xinwei(College of New Energy,China University of Petroleum(East China),Qingdao 266580,Shandong,China)

机构地区：[1]中国石油大学(华东)新能源学院,山东青岛266580

出　　处：《化工学报》2020年第12期5479-5488,共10页CIESC Journal

基　　金：国家自然科学基金项目(51874333);国家“十三五”重大科技专项(2016ZX05012-002);山东省自然科学基金项目(ZR2017MEE030);中央高校基本科研业务费专项资金(19CX02014A)。

摘　　要：稠油热采水平井注蒸汽是一个复杂多变的过程,水平井沿程蒸汽热物性的预测对于储层的均匀动用十分关键。考虑储层渗透率、围压和蒸汽相变等条件的相互耦合影响,建立了预测水平井注汽流动的综合数学模型。与现场测井数据进行对比分析,验证了模型的准确度。模拟结果表明,单一变量条件下,水平井跟部注汽压力越大,注汽井内质量流量和蒸汽干度下降越快,当注汽压力由11 MPa降为8.5 MPa时,配汽距离增加1倍;在水平井相同位置处,跟部注汽干度越高,注汽井内质量流量越大,且蒸汽压力下降越快,注汽干度提高1倍时,压降也几乎增加1倍;跟部注汽流量越大,蒸汽压力下降越快,注汽流量提高1.75倍时压降提高了5.3倍,但管内蒸汽干度下降趋缓;储层渗透率越高,注汽井内的蒸汽干度下降越快。该模型可以为现场注汽提供理论支撑,有效提高配汽效果达到增产降耗。Steam injection in horizontal wells for thermal recovery of heavy oil is a complex and changeable process.The prediction of thermal properties of steam along horizontal wells is critical to the uniform production of reservoirs.In this paper,considering the mutual coupling effects of reservoir permeability,confining pressure,and steam phase transition,a comprehensive mathematical model for predicting steam injection flow in horizontal wells was established.Compared with the on-site logging data,the accuracy of the model was verified.The simulation results show that under a single variable condition,the larger the steam injection pressure at the heel,the faster the mass flow and steam dryness decrease.When the steam injection pressure drops from 11 MPa to 8.5 MPa,the steam distribution distance doubles.At the same position,the higher the steam dryness at the heel,the greater the mass flow in the steam injection well,and the faster the steam pressure decrease.Double the steam injection dryness,the pressure drop is almost doubled,but the longer steam injection distance.The larger the steam injection flow at the heel,the faster the steam pressure decreases,and the decrease in the steam dryness in the tube slows down.When the steam injection flow increases by 1.75 times,the pressure drop increases by 5.3 times.The higher the reservoir permeability,the faster the steam dryness decreases.By obtaining the general rules of steam distribution in horizontal wells to provide theoretical support for on-site steam injection,the steam distribution effect can be effectively improved to increase production and reduce consumption.

关 键 词：气液两相流 热力学性质 相变 水平井 注蒸汽 非均质储层 

分 类 号：TE03[石油与天然气工程]