页岩油压裂水平井试井测试方法研究

Research on well test method of shale oil fracturing horizontal well

页岩油采用水平井规模压裂开发模式,压裂后井筒周围形成复杂的缝网,流动特征复杂,常规试井方法很难准确描述其流动特征,因此,需要建立一套页岩油压裂水平井试井测试方法。通过结合裂缝有效半缝长、缝宽和裂缝间距及压裂后渗透率等相关参数,建立了水平井压裂后试井模型及一套测试方法;通过模拟稳定产能测试、不稳定试井测试及两井干扰测试,研究工作制度和储层参数对试井曲线的影响,分析试井曲线,确定合理的工作制度和测试时间。结合苏北盆地的实际投产井生产情况,得到定量化测试产量及测试时间等数据资料,综合评价压裂改造效果和井控动态储量,确定合理工作制度和产能,为页岩油有效开发提供技术支撑。

Shale oil adopts horizontal well-scale fracturing development mode.After fracturing,a complex fracture network is formed around the wellbore,and the flow characteristics are complex.It is difficult for conventional well-testing methods to describe the flow characteristics accurately.Therefore,it is necessary to establish a set of shale oil fracturing horizontal well test methods.Combined with the parameters such as effective half-fracture length,fracture width,fracture spacing,and permeability after fracturing,a well-testing model and a set of testing methods for horizontal wells after fracturing is established.By simulating the stable productivity test,the unstable well test,and the two-well interference test,the influence of the work system and reservoir parameters on well test curves are studied,and the well test curves are analyzed to determine a reasonable work system and testing time.Based on the actual production situation of wells put into production in the Subei Basin,the quantitative test output,test time,and other data are obtained to comprehensively evaluate the effect of fracturing and the well control dynamic reserves to determine the reasonable working system and production capacity and to provide technical support for the effective development of shale oil.