古城7井工程钻井设计优化与钻井实践

Design Optimization of Engineering Drilling for Well Gucheng-7 and the Drilling Practice

摘要:

古城7井是大庆油田塔东区块的首钻井，为了增加钻井成功率以及缩短钻井周期和钻井成本，在工程设计中的井身结构、钻具组合、钻头优选和扭力冲击器配合PDC钻头使用上，进行了大量的计算、统计分析和筛选，在实钻中钻速得到了大幅提高，平均机械钻速为4.68 m/h，比古城6井平均机械钻速3.01 m/h提高了55.48%，钻井周期大幅缩短，完钻周期为152.44 d，按同开次同井深与古城6井相比，缩短了86.8 d。实践证明，古称7井工程设计符合塔东区块的地质情况，能够大幅地提高钻速，缩短周期和钻井成本，为加快勘探开发步伐打下了坚实的基础。

关键词:扭力冲击器;井身结构;钻具组合;PDC钻头

Abstract:

Well Gucheng-7 is the first drilling well in Tadong block of Daqing oilfield. To increase the success rate of drilling, shorten drilling period and reduce drilling cost, a lot of calculation, statistical analysis and screening were made on the designs of well structure, BHA, bit optimization and the application of torsion impact apparatus in combination with PDC bits, the real drilling speed was greatly improved. The average penetration rate was 4.68m/h, 55.48% higher than that in well Gucheng-6 of 3.01m/h; drilling cycle is 152.44d, 86.8d less than well Gucheng-6. The practice shows that the design of well Gucheng-7 is consistent with the geological conditions in Tadong block with large improvement of drilling speed, short drilling period and low drilling cost.

Key words:torsion impact apparatus; well structure; BHA; PDC bit