摘要
针对常规气井钻井过程中易发生的早期溢流问题,开展了气井钻井溢流早期监测研究。在分析气体侵入方式基础上建立了气侵流动机理模型,分析了天然气溢流对井内压力的影响;研究建立了钻井环空多相流动数学力学模型,得到了钻进过程中允许的气侵溢流临界条件判别式,进一步结合泵工作冲数和立管压力确定了早期溢流发现的判别方法。将气井钻井溢流早期监测技术应用于气井钻能在发生溢流量较少时及时发现溢流现象并报警,利于及早排出溢流,恢复安全正常钻进作业,大大降低溢流处理费用,减少溢流发现的人为因素影响,对提高气井钻井的安全性和效益有着十分重要的意义。
In view of the early overflow problem happened in conventional gas well drilling process,the early overflow detection study of gas well drilling was carried out. Based on the analysis of the gas invasion method,the mechanism model of gas flow was established and the influence of the gas overflow to the borehole pressure was analysed. The drilling annulus multiphase mathematical and mechanical model was established in the research. The gas cut overflow critical condition allowed in the process of drilling and the early overflow discriminated method were found using pump working punch number and standpipe pressure. Gas well drilling overflow early detection technology is applied in gas well drilling,which can find the overflow exists in time and raise the alarm when the overflow capacity is small. The overflow can be discharged as soon as possible and the normal drilling work can be restored,which greatly reduce the overflow processing costs and the artificial factors of the overflow detection. This detection technology has a vital significance on enhancing the security and efficiency of gas well drilling.
出处
《广西大学学报（自然科学版）》
CAS
北大核心
2016年第1期291-300,共10页
Journal of Guangxi University（Natural Science Edition）
基金
国家重大专项课题资助项目(2011ZX05022)
关键词
气井钻井
溢流
早期监测技术
气侵流动机理
多相流
gas well drilling
overflow
early detection technology
gas cut flow mechanism
multi-phase flow
