无隔水管钻井技术临界排量分析  

Analysis on the Critical Displacement of Riserless Drilling Technology

作　　者：彭齐[1] 樊洪海[1] 纪荣艺[1] 周号博[2] 赖敏斌 罗顺 付随艺[1] 

机构地区：[1]中国石油大学(北京)石油工程教育部重点实验室 [2]中国石化石油工程技术研究院 [3]中国石油西部钻探工程公司

出　　处：《石油机械》2016年第2期48-52,共5页China Petroleum Machinery

基　　金：国家自然科学基金项目"高压气井内高速流体诱发生产管柱振动特性研究"(51274219)

摘　　要：鉴于国内有关无隔水管钻井技术水力学研究较少,且循环压耗计算仍然基于适用性较差的钻井液流变模式的现状,采用罗-斯模式建立了适用于无隔水管钻井系统的全流态水力学分析方法,分析了泵排量随水深、井深的变化规律。分析结果表明,无隔水管钻井系统正常钻进过程中,应保持泵排量大于或等于临界排量,否则立管压力将为负数,钻柱内将出现U形管效应;钻柱内循环压耗对立管压力随排量变化的规律影响较大,环空循环压耗和钻头压降对其影响较小;不同深水条件下临界排量均随着井深的增加而减小,当井深相同时,水深较小的工况下临界排量较小。所得结论对无隔水管钻井系统平台泵排量的确定有指导意义。Considering that few domestic studies has been focused on the hydraulic study of riserless drilling technology, and the circulating pressure loss calculation is still based on the drilling fluid flow pattern with poor ap?plicability, a full flow pattern hydraulics analysis method applicable to the riserless drilling system is established based on the Robertson?Stiff model?The effects of water depth and well depth on the pump displacement are ana?lyzed?The results show that, pump displacement should be greater than or equal to the critical displacement during normal drilling, otherwise standpipe pressure will be negative and U?shaped pipe effect will occur within the drill string?The circulation pressure inside the drill string has a significant effect on the relation between standpipe pres?sure and displacement, while the annular circulating pressure loss and bit pressure drop have little effect?Under different water depth, the critical displacement decreases with increasing depth?Given the same well depth, smal?ler water depth results in smaller critical displacement?The conclusion could provide guidance for the riserless drill?ing platform pump displacement.

关 键 词：无隔水管钻井 水力计算 临界流量 循环压耗 水深因子 

分 类 号：TE951[石油与天然气工程—石油机械设备]