潜山低渗透储层试井设计主控因素及改进方案  

Main controlling factors and improvement of well testing design for buried-hill low-permeability reservoirs

作　　者：房鑫磊 赵洪绪 杨志成 于伟强 赵洪涛 FANG Xinlei;ZHAO Hongxu;YANG Zhicheng;YU Weiqiang;ZHAO Hongtao(China France Bohai Geoservices Co.,Ltd.,Tianjin 300457,China;Boxi Operation Company of Tianjin Branch of CNOOC(China)Co.,Ltd.,Tianjin 300451,China)

机构地区：[1]中法渤海地质服务有限公司,天津300457 [2]中海石油(中国)有限公司天津分公司渤西作业公司,天津300451

出　　处：《油气井测试》2022年第6期59-64,共6页Well Testing

摘　　要：潜山低渗透储层微裂缝发育不均匀,非均质性强,试井设计参数选取困难、误差大。基于双重孔隙介质模型优选产能预测和不稳定试井设计参数,通过改进常规测试流程获取井底流压测试数据,利用井底流压与产量对应关系,对试井设计参数进行实时更新,指导产能测试和压力恢复过程,使产能测试制度、压力恢复关井时间更加合理。以S1井为例,原试井设计渗透率为0.34 mD,关井1~10 h出现关井压力双对数曲线径向流特征;通过改进的方法进行试井设计,渗透率为0.023 mD,关井180~200 h径向流特征明显,关井190 h后开始出现比较明显的系统径向流直线段,与改进的试井设计指导时间基本吻合。通过潜山储层开发井实际工程验证,取全取准了压力数据,可有效指导测试过程和压力数据解释工作。Buried-hill low-permeability reservoirs are highly heterogeneous,with uneven microfractures,leading to difficult selection of parameters and large error for well testing design.Based on the dual-porosity model,the parameters for productivity prediction and unstable well testing design were optimized,and the bottomhole flow pressure data were obtained by improving the conventional testing process.Using the corresponding relationship between bottomhole flow pressure and production,the parameters for well testing design were updated in real time,which can guide the process of productivity testing and pressure recovery,making the productivity testing system,pressure recovery and shut-in time more reasonable.Taking Well S1 as an example,under the original well testing design with the permeability of 0.34 mD,the shut-in pressure showed a double logarithmic curve radial flow behavior at the shut-in time of 1~10 h;under the well testing design improved with the permeability of 0.023 mD,the well show an obvious radial flow behavior at the shut-in time of 180~200 h,and begun to show an obvious straight-line segment in systematic radial flow,which is basically consistent with the guidance time from improved well testing design.Through the actual engineering verification of development wells in buried hill reservoir,the obtained,which can pressure data is fully effectively guide the testing process and pressure data interpretation work.

关 键 词：试井设计 低渗透 非均质性 测试制度 关井时间 径向流 设计参数 试井解释 

分 类 号：TE353[石油与天然气工程—油气田开发工程]