磨料射流在石油钻井工程中的应用研究

Application research of abrasive jet in oil drilling project

针对我国石油钻井工程领域中深井、超深井钻井过程中遇到的钻速慢、岩石硬度大、耐磨性高等难题,结合理论及试验研究,提出并研制了一种钢粒磨料射流钻井技术工艺及系统。钢粒磨料射流钻井技术主要用于难钻、耗时、成本较高的特定极硬或研磨性井段,系统由磨料注入系统、钻头、磨料回收系统三大部分集成。理论及试验结果均表明,磨料射流冲击破岩过程中,岩石破碎体积随压力和浓度的增加而增大,并存在最优喷距、最优喷射角度和最优浓度;现场应用表明,磨料射流破碎岩石体积明显大于普通水射流,对于提高井底岩石破碎效率和钻井速度有明显优势,在我国油气埋藏较深、岩石坚硬耐磨的地区具有广阔的应用前景。

Tubing for the the deep,ultra- deep drilling encountered slow,rock hard,wear and other problems in the field of oil drilling project,combination of theoretical and experimental research,a steel shot abrasive jet drilling technology processe and system is proposed and developed. It is mainly used for drilling difficult,time- consuming,costly particular extremely hard or abrasive well section,which consists of abrasive injection system,drill,three major integrated recycling system. Theoretical and experimental results show that the impact of abrasive jet rock breaking process,rock crushing volume increases with increasing pressure and concentration,and the presence of optimal spray distance,optimal spray angle and optimum concentration. Field application shows Breakup abrasive rock volume was significantly greater than ordinary water jet,which is to improve the efficiency of downhole rock crushing and drilling speed has obvious advantages. The technology of oil and gas buried deep in our country,hard rock abrasion areas has broad application prospects.