塔里木油田缝洞型油藏试井解释新模型研究  

Research on New Well Testing Interpretation Model for Fracture Cavity Type Reservoir in the Tarim Oilfield

作　　者：熊钰[1] 滕鹏[1] 牛新年[2] 蔡明金[2] 

机构地区：[1]西南石油大学石油与天然气工程学院,四川成都610500 [2]塔里木油田分公司,新疆库尔勒841000

出　　处：《油气井测试》2017年第3期1-4,共4页Well Testing

摘　　要：针对常规试井分析理论受模型简化的限制,一般不能满足缝洞型油气藏渗流问题的求解需要,提出了串联双溶洞的试井解释模型,建立了相应的数学模型,利用Laplace变换和Stehfest数值反演算法进行了求解;分析了溶洞储容比、溶洞大小、裂缝宽度、溶洞距离等参数对压力响应的影响。研究表明,溶洞半径和溶洞储容比对压力响应比较相似,其值越大,早期直线越长。溶洞相当于扩大了井径,增加了"井筒储集系数";裂缝越宽,凹子越长,窜流发生越早;溶洞之间距离越长,凹子反映越滞后。提出了适用于缝洞型油藏的试井解释方法,编制了实用软件,利用模型对塔里木油田某井进行了解释,解释结果与地质模型和钻井数据一致。According to the conventional analytical theory of well test limited by the simplified model,it cannot meet such needs to solve the seepage of fracture cavity reservoirs,the well test interpretation model of series double cavity is proposed,the corresponding mathematical model is established,and the Laplace transform and Stehfest numerical inversion algorithm are used to solve the mathematical model.The influences of karst reservoir capacity ratio,size of cave,width of crack,distance of cave on the bottom pressure response are analyzed. The research shows that the response to pressure of Radius of karst cave is similar to karst reservoir capacity ratio,the greater the value,the longer the straight line. The cavern is equal to the expansion of the well diameter and increases the'well bore storage coefficient'; The wider of the crack,the longer the concave is,and the fluid channeling will earlier occur; The distance between the karst cave is longer,the reflection is more backward. The method of well testing interpretation is put forward,which is suitable for the fracture cavity type reservoir,and the practical software isdeveloped. The model is used to interpret a well in the Tarim oilfield,and the results are consistent with the geological model and drilling data.

关 键 词：碳酸盐岩 大型裂缝 大型洞穴 试井分析 自动拟合 

分 类 号：TE353[石油与天然气工程—油气田开发工程]