涩北气田钻井工程提速、提效措施及成效

Efficiency and effectiveness achieved in drilling engineering in the Sebei Gas Field,Qaidam Basin

柴达木盆地涩北气田第四纪产层埋藏浅、含气井段长,地层疏松、泥质含量高,气、水关系复杂,井眼易缩径、易塌,钻井复杂、井下事故多,存在着钻井周期长、成本高、效益差的问题。为高效建成100×108 m3高原气田,中国石油青海油田公司引入市场竞争机制,开展涩北气田安全快速钻井及水平井工艺配套技术研究,强化生产组织和井控管理,实现了提速、提效的工作目标:机械钻速由13.03m/h提高到41.39m/h,钻井周期由27.55d减少到6.29d,固井合格率达到100%,气井单井产量提高3倍以上,近4年累计节约投资4.88亿元。结论认为:要做到优、快、高效开发涩北气田这一类复杂气田,必须坚持管理创新、技术创新、机制创新,并发挥好定额管理的基础性作用。

Low cost and rapid drilling will be the key to the efficient development of the Sebei Gas Field,Qaidam Basin,where the Quaternary pay zone is buried shallow with loose beds and high shale content.Therefore,due to multiple gas-bearing layers and a complex gas water relationship,borehole shrinkage and collapse were often encountered in drilling wells,let alone the complicated downhole situation and downhole accidents.As a result,drilling operators there have been always troubled by a long cycle,a high cost,and a poor effect.In view of this,to build a gas field on the plateau with a deliverability of 10 billion m3,the PetroChina Qinghai Company introduced the market and competitive mechanisms,conducted technical studies on how to achieve safe and rapid drilling assisted by a complete set of horizontal well drilling techniques,and strengthened production organization and well control management.After four years of efforts,the rate of penetration （ROP） in this study area was enhanced from 13.03 to 41.39 m/h,the drilling cycle was shortened from 27.55 to 6.29 days,the per-well production was tripled; as a result,about 488 million yuan （RMB）was saved in total.In conclusion,to achieve the development of complex gas fields like Sebei with a high quality,a high speed and a high efficiency,operators should insist on technical improvement,management and mechanism innovation and also excel the fundamental role of quota management.