鄂北气田小井眼钻完井关键技术研究及应用

Research and application of drilling and completion technologies for slim-holes in North Ordos Gas Field

摘要:

针对鄂尔多斯北部气田小井眼存在钻井及固井泵压高、机械钻速低、钻井技术不完善等技术问题，通过对井身结构和轨道剖面优化，钻杆、动力钻具和PDC钻头优选，水泥浆密度和套管扶正器数量及加放位置优化，形成低成本小井眼优快钻完井技术。该技术现场试验200口井，钻井周期年缩短率12%以上，机械钻速提高至18 m/h以上，钻井废弃物和固井水泥浆用量平均减少了27%和41%，平均单井钻井工程费用降低50万元左右，达到了降本增效和保护环境的目的，为鄂北气田低成本高效开发探明了方向。

Abstract:

Technical problems exists in slim-hole drilling of North Ordos Gas Field such as drilling and cementing high pump pressure， low rate of penetration and imperfect drilling technology. Well bore structure， track profile， drilling pipe， dynamical drilling tools， PDC bits， slurry density， number and setting position of the casing centralizers were optimized， and thereby formed the fast drilling and completion technology for slim-holes with low cost. 200 wells were tested using this technology， as a result， the rate of drilling cycle was reduced by more than 12%， the mechanical drilling rate increased to over 18m/h， the drilling waste and slurry for cementation decreased by 27% and 41% on average， about 500 thousand RMB on average was decreased for single well drilling cost ， the goals of cost reduction， efficiency improvement and environment protection were achieved which find out the direction for low cost and high efficient development in North Ordos Gas Field.