摘要
水力压裂是目前开采致密油气的主要方式,压裂施工期间测量的地面压力及流量数据包含地层压力、渗透率和裂缝半长等重要信息,这些参数是判断压裂施工成功率及压后开采制度制定的重要依据.提出了基于数字滤波压裂停泵数据反演方法,首先采用井筒垂直管流方程将变密度和流量的地面压力折算到井底压力,其次采用FIR滤波处理停泵后压降数据,消除停泵水锤等噪声干扰,获得反映地层渗流的压降数据,最后采用垂直裂缝井试井分析方法解释滤波后的压降数据,获得地层渗透率、原始地层压力及裂缝半长等重要参数,实现了对裂缝及地层参数的实时分析及评价.通过与关井压力恢复分析结果比较,证明了所提方法的可靠性.
Hydraulic fracturing is currently the main method of exploiting tight gas and oil. The pump-stop pressure and flow-rate data measured during hydraulic fracturing process contains a great deal of important information, such as the formation pressure, permeability and fracture half-length. These parameters are significant iudgment to decide post-fracturing mining system. A new method of pump-stop data-inversion analysis method based on digital filtered pump-stop flow-rate and density-changing pressure data of hydraulic fracturing was presented. Firstly, the ground pressure was converted to the well bottom pressure according to the vertical pipe flow theory. The obtained bottom pressure data, also known as pump-stop pressure data, was processed through the FIR filter to eliminate the interference of water hammer and other noise signals. Finally, the filtered data, which contains the information of formation permeability and initial pressure, was processed according to vertical fracture well test analysis. This new method has been proved reliable by comparing it with pressure build-up, making real-time evaluation of fracture and formation information possible.
作者
温杰雄
田伟
毕全福
李雪彬
卢德唐
WEN Jiexiong;TIAN Wei;BI Quanfu;LI Xuebin;LU Detang(Department of Modern Mechanics,University of Science and Technology of China,Hefei 230027,China;CNPC Xibu Drilling Engineering Company Limited,Kararnay 834027,China)
基金
中国科学院战略先导科技专项(XDB10030402)
中国科学院-中石油重大战略合作项目(2015A-4812)资助
关键词
数字滤波
水力压裂
试井分析
压裂评价
digital filtering
hydraulic fracturing
well test analysis
fracturing evaluation
