火驱油墙技术界限判定及运移特征  

Technical Boundary Determination and Propagation Pattern of Fire-Flooding Oil-Wall

作　　者：王伟伟[1,2] Wang Weiwei(PetroChina Liaohe Oilfield Company,Panjin,Liaoning 124010,China;National Energy Heavy Oil R&D Center,Panjin,Liaoning 124010,China)

机构地区：[1]中国石油辽河油田分公司 [2]国家能源稠(重)油开采研发中心

出　　处：《特种油气藏》2019年第4期131-135,共5页Special Oil & Gas Reservoirs

基　　金：国家科技重大专项“辽河、新疆稠油(超稠油)开发技术示范工程”(2016ZX05055)

摘　　要：针对火驱地下油墙形成及运动规律不清的问题,利用自主研制的火驱物理模型,开展了杜66块K039井天然岩心物理模拟实验,对比分析了含油饱和度与温度的关系,提出了油墙技术界限的判定方法。结果表明:油墙技术界限的上、下限分别为实验压力下的饱和蒸汽温度值和实验用油的拐点温度;火线形成后,原油在高温作用下聚集形成高饱和度油墙;随着火线推进,油墙范围不断增大,模型内压力不断上升,当油墙接近生产井时油墙范围达到最大,模型内压力达到峰值,生产井进入稳产阶段;随着原油不断采出,模型压力下降,油墙范围逐渐减小直至消失,火线到达生产井。将室内油墙运移特征应用于杜66块观察井,分析表明,试验井组油墙已形成,且前锋已到达生产井,处于热效驱油稳产阶段。该研究明确了火驱过程中油墙的运移规律及增油机理,通过对油墙的动态跟踪判识,可判断出现场油墙的相对位置及生产阶段,对稠油火驱开发现场的综合调控提供了技术支持。A self-developed physical model for fire-flooding was used to clarify the underground oil-wall formation and propagation patterns.The natural core sample of Well K039 in Block Du66 was tested to compare and analyze the relationship between oil saturation and temperature and propose a determination method for the oil-wall technical boundary.Result indicates that The upper and lower limits of oil-wall are the saturated steam temperature under experimental pressure and the oil inflection point temperature.The oil accumulates and forms a high-saturation oil-wall after the formation of fire-line.With the propagation of fire-line,the oil-wall continues to expand and the pressure inside the model continues to rise.The oil-wall reaches the maximum when the oil-wall approaches the production well.The pressure inside the model reaches the maximum at this moment and the well keeps a steady production.With the recovery of oil,the pressure inside the model drops,the oil-wall gradually decreases until it disappears,and the fire-line reaches the production well.The laboratory test oil-wall propagation pattern was applied to the observation well in Block Du66.Analysis demonstrates that the oil-wall has been formed in the test well group/The front has reached the production well,which steps into a steady production stage with thermal displacement.This research clarifies the propagation pattern of oil-wall and oil enhancement mechanism in fire-flooding development.The field fire-wall position and production stage can be determined by the oil-wall tracking and identification.This research could provide certain technical reference for the comprehensive management and adjustment of fire-flooding development.

关 键 词：杜66块 火驱 油墙 技术界限 运移特征 增油机理 

分 类 号：TE357.44[石油与天然气工程—油气田开发工程]