BZ34-5油田复杂地层低效井治理工艺技术

Treatment of low efficiency wells in complex formation in BZ34-5 Oilfield

BZ34-5-A井原属高产井,但后期出现一系列复杂问题导致该井无法生产。为了恢复该井产能,需要对其进行综合治理。通过对该区块前期钻完井资料的分析和该井投产后期出现的问题进行深入分析研究,对综合治理方式进行比选,形成最终作业方案:使用强抑制无固相钻井液侧钻开钻,裸眼段下入打孔管,在打孔管内以电缆射孔的方式完成对该低效井的治理,安全快速地完成了该井的综合治理工作,最大限度地保护了储层,使该井恢复了产能。该治理技术可大幅节约成本,对于附近区块类似低效井的治理提供了很好的技术借鉴。

Well BZ34-5-A was originally a high-yield well,but a series of complex problems occurred in the later period,which made the well unable to produce.In order to restore the well productivity,comprehensive treatment of the low-efficiency well was needed.Based on the analysis of drilling and completion data in the early stage of the block and the problems in the late stage after it was put into production,the final operation scheme was determined through comparison of the comprehensive treatment methods.The solid-free drilling fluid with strong inhibition was used to for sidetracking,the perforation pipe was run into the open hole section without cementation,and then the perforation pipe was perforated with wireline perforation to complete the treatment of the inefficient well safely and quickly;thus protecting the reservoir to the maximum extent and restoring the productivity of the inefficient well.At the same time,the treatment cost was greatly reduced,which provides a good reference for similar low efficiency wells in nearby blocks.