空气钻井井筒内气体携岩与冲蚀评价分析  

Evaluation of Gas's Carrying Capacity and Erosion Ability in Air Drilling

作　　者：朱红钧[1] 林元华[1] 明传中[2] 赵思军 牟鹤林[2] 

机构地区：[1]西南石油大学石油管力学和环境行为重点实验室 [2]塔里木油田分公司工程技术部 [3]川庆钻探工程公司川东钻探公司

出　　处：《钻井液与完井液》2010年第2期34-36,42,共4页Drilling Fluid & Completion Fluid

基　　金："新世纪优秀人才支持计划"(NCET-08-0907);四川省杰出青年学科带头人培养基金(06ZQ026-028)资助;中国石油天然气集团公司应用基础研究项目"非API标准油气井管材及管柱安全性与优化设计技术研究"(2008A-3005)中的部分内容

摘　　要：空气钻井技术具有及时发现和保护油气层,提高油气产量和采收率,提高机械钻速,减少和避免井漏等显著优势,但其携岩能力与钻具冲蚀问题一直困扰着钻井科技人员。基于计算流体动力学与空气动力学理论,建立了空气钻井井筒内流体流动的数学模型,并结合实例,对空气钻井时井筒内气固两相的流场分布进行了模拟计算,计算结果与实际钻井操作参数吻合较好,综合最小携岩速度与冲蚀临界速度准则,对井筒流场进行了定性评价。探索出了一种较简单而快捷地确定空气钻井注入参数的方法,为实际钻井参数设计提供了依据。Air as a drilling fluid has the advantages of protecting reservoirs from being damaged by liquid drilling fluids,enhancing ROP,mitigating and avoiding lost circulation. On the other hand,the carrying capacity of and drill-string erosion by air are difficulties obsessing drilling engineers. A numerical model is established for the flow of fluid in holes drilled with air,and a simulation of borehole gas-solid two phase flow field is performed combined with drilling data obtained from drilled wells. Combining the minimum velocity of cuttings carrying and critical erosion velocity criteria,flow field in bore hole is qualitatively evaluated. The work provides a base for practical drilling design.

关 键 词：空气钻井 井眼净化 最小携岩速度 冲蚀临界速度 气固两相流 

分 类 号：TE242.7[石油与天然气工程—油气井工程]