气体钻井地层出水条件下井筒湿度研究  

Wellbore Humidity Under Producing Formation Water During a Gas Drilling

作　　者：李海涛[1] 魏纳[1] 李永杰[1] 翟小强 孟英峰[1] 李皋[1] 陶祖文[3] 

机构地区：[1]西南石油大学油气藏地质及开发工程国家重点实验室,四川成都610500 [2]中国石油集团钻井工程技术研究院,北京102206 [3]中国石化西南石油工程有限公司井下作业分公司,四川德阳618000

出　　处：《天然气技术与经济》2016年第4期27-30,82,共4页Natural Gas Technology and Economy

摘　　要：建立了稳态钻杆—环空流动模型,与此同时耦合井筒压力、温度分布以及井筒相对湿度模型,通过数值模拟求解从而得到井筒压力分布、气体最大含湿能力、相对湿度分布以及露点条件下的地层临界出水量和相对湿度。研究结果表明:当相对湿度高于露点条件下的临界相对湿度时,虽在井口未见凝液出现,但井底已有凝液出现,随着地层水在井筒内对岩屑和井壁的的不断作用,最终导致井下复杂情况的发生。In this study, a model of steady-state drill stem and annular flow has been developed. Meanwhile, this model is coupled with another model of wellbore pressure, temperature distribution,and relative humidity of wellbore. And the distribution of wellbore pressure, the maximum humidity ratio, the distribution of relative humidity, and the critical formation-water yield and critical relative humidity under a dewpoint may be obtained from a numerical simulation. Results show, when the relative humidity is higher than the critical relative humidity, even though no condensate found in wellhead or only appeared in bottomhole, some downhole complexities will happen along with the constant effect of formation water on cuttings and sidewall.

关 键 词：气体钻井 湿度 压力 出水量 数值模拟 

分 类 号：TE21[石油与天然气工程—油气井工程]