大塔场构造遂宁组—须家河组钻井技术难点及应对措施

Technical Difficulties and Countermeasures for Drilling in Suining Formation and Xujiahe Formation of Datachang Structure

大塔场构造筇竹寺组、灯影组具有良好的生储盖组合且分布广泛,具有巨大的油气藏勘探开发潜力。该地区地质条件复杂,在上部地层钻进过程中,发现沙溪庙组井漏问题突出、须家河组岩石可钻性差等诸多难点。为了加快该区块的钻探进程,解决制约钻井提速的技术难题,通过分析前期钻完井和正钻井资料,明确了大塔场构造上部地层钻进过程中可能遇到的技术难点,结合现场实践提出了防止起步井斜方法、大尺寸套管固井技术、凝胶水泥堵漏技术、钻头优选等技术措施,对今后在该区块钻井和固井施工具有一定的指导作用。

The Qiongzhusi formation and Dengying formation of Datachang structure have good source-reservoir-cap assemblages with great potential for the exploration and development of oil and gas reservoirs.But the geological conditions in this area are complicated,during the upper formation drilling,serious leakage of Shaximiao formation,poor drillability of Xujiahe formation and some other difficulties were found.In order to speed up the drilling process in this block and solve the technical difficulties which restricted the drilling speed,by the analysis on the drilling data of the early drilling completion and the present drilling situation,the technical difficulties probably being encountered in the drilling of upper formation of Datachang structure are clarified.According to the field practice,the technical measures of initial well deviation prevention method,large size casing cementing technology,gel cement plugging technology,bit selection are put forward,which can be guidance in drilling and cementing construction in this block.