西湖凹陷探井射孔参数优化方法  

Optimization method on perforation parameters for exploration wells in Xihu sag

作　　者：王雷 赵洪绪 景社 于伟强 WANG Lei;ZHAO Hongxu;JING She;YU Weiqiang(Shanghai Branch of CNOOC(China)Ltd.,Shanghai 200335,China;China-France Bohai Geoservice Co.,Ltd,Tianjin 300457,China)

机构地区：[1]中海石油(中国)有限公司上海分公司,上海200335 [2]中法渤海地质服务有限公司,天津300457

出　　处：《油气井测试》2023年第5期44-49,共6页Well Testing

摘　　要：西湖凹陷早期探井由于射孔工艺等原因,导致产能较低,生产未达到预期。对影响早期探井产能的射孔因素进行分析,为进一步上产增储、产能释放提供决策依据。从渗流力学原理出发,考虑双径向流动,建立射穿和未射穿污染带情况下的直井射孔产能计算模型;以该区典型井的储层参数为基础研究射孔参数对产能的影响,并利用室内射孔穿深模拟数据进行射孔参数优化。结果表明,孔深和孔径是影响该区早期探井产能的主控因素,压实带影响次之。XX-1井早期采用的射孔参数未能最大化释放该层产能,通过射孔参数优化后,理论计算其无阻流量从早期测试时的50×10^(4)m^(3)/d增加到80×10^(4)m^(3)/d,增幅达到60%。该方法为决策西湖凹陷早期探井产能释放措施提供了一种研究思路。Due to factors such as perforation techniques,early exploration wells in the Xihu sag showed a lower productivity than expected.An analysis on the perforation factors affecting early well productivity was conducted to provide a basis for decision-making regarding further production increasement and productivity release.Starting from the principles of fluid flow mechanics and considering a bi-radial flow,a productivity calculation model for vertical well perforations was established with both penetrated and unpierced contaminated zones.Based on the reservoir parameters of a typical well in the area,the impact of perforation parameters on productivity was studied,and by using simulated data from laboratory perforation penetration tests,the perforation parameters were optimized.The results show that perforation depth and diameter are the primary controlling factors affecting the early well productivity in the area,following by compaction zones.The perforation parameters used in Well XX-1 during the early stages did not maximize the release of reservoir productivity.After perforation parameter optimization,theoretical calculations indicated that the open flow rate could increase from 50×10^(4)m^(3)/d during the early tests to 80×10^(4)m^(3)/d,with an increasement of up to 60%.This approach provides a research idea for adopting measures to release the productivity of early exploration wells in Xihu sag.

关 键 词：西湖凹陷 探井 射孔 双径向流动 产能模型 影响因素 参数优化 产能释放 

分 类 号：TE257[石油与天然气工程—油气井工程]