气体钻井井底压力影响因素分析  

Analysis on Influence Factors of Bottom-hole Pressure in Gas Drilling

作　　者：闫铁[1] 陈勋[1] 毕雪亮[1] 孙士慧[1] 

机构地区：[1]东北石油大学提高油气采收率教育部重点实验室,大庆163318

出　　处：《科学技术与工程》2011年第25期6045-6048,共4页Science Technology and Engineering

基　　金：国家科技重大专项课题(201108ZX05021-006)资助

摘　　要：井底压力控制是气体欠平衡钻井技术的核心,该文在Guo模型的基础上,采用微分迭代的方法求解井底压力。考虑气体注入速率、井口回压、井深、机械钻速和井径扩大率对井底压力的影响,并利用编制的计算程序进行模拟。模拟结果表明,随着气体注入速率、井口回压、井深、机械钻速的增大,环空井底压力逐渐升高;随着井径扩大率的增大,环空井底压力逐渐降低。计算为气体钻井设计和井控理论研究提供了一定的依据。Bottom-hole pressure control is the core of gas drilling technology. Based on model Guo, differential iterative method is used to acquire downholc pressure. The algorithm was realized through program, ＂the influence factors, such as gas injection rate, back pressure, depth, rate of penetration （ROP）, and wellhole enlargement, were analyzed. The results show that, with the gas injection rate, back pressure, depth, ROP increases, the annular bottom-hole pressure gradually increasing; with the wellhole enlargement increases, the annular＇bottom-hole pressure gradually decreaseing. The result can be used to provide foundation for the optimization design and the well control theory in gas drilling.

关 键 词：气体钻井 井底压力 井口回压 井径扩大 

分 类 号：TE242.6[石油与天然气工程—油气井工程]