变注入参数空气钻井流场模拟对比分析  

Analysis of Flow Field in Air Drilling with Variation of Injecting Parameters

作　　者：朱红钧[1] 林元华[1] 李强[1] 杜仁德[2] 王新虎[3] 牟鹤林[4] 

机构地区：[1]CNPC石油管力学和环境行为重点实验室(西南石油大学),四川成都610500 [2]中国石化西南油气分公司,四川成都610081 [3]中国石油管材研究所,陕西西安710065 [4]中国石油塔里木油田公司,新疆库尔勒841000

出　　处：《石油钻探技术》2010年第4期49-52,共4页Petroleum Drilling Techniques

基　　金："新世纪优秀人才支持计划"(编号:NCET-08-0907);四川省杰出青年学科带头人培养基金(编号:06ZQ026-028);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"(编号:2008A-3005)资助

摘　　要：空气钻井具有钻速快、成本低、对储层伤害小等特点,但关于井内流场分布及工艺参数研究仍不够完善。基于流体动力学方法,利用Fluent软件对空气钻井不同注入参数下的流场进行了数值模拟,得出了井内压力和流速分布。结果表明:过流截面积变化与钻具表面的粗糙度均会影响流场,关键部位因环空截面积的增大流速明显减小,易于岩屑的沉积;注入压力一定时,井口是否采用回压,要根据井筒内具体的流速分布确定,流速既要满足携岩要求又不可超过冲蚀速度。因此,根据井眼净化要求,结合冲蚀控制标准,利用Fluent软件进行多组次模拟分析对比,可取得较优的工艺参数组合,为空气钻井注入参数设计提供了一种简单、快捷的方法。Air drilling has good rate of penetration,low cost,low reservoir damage,etc,while the distribution of air flow field and technical parameters still need more investigation.Based on the computation fluid dynamics theory,the flow field in well was simulated using FLUENT with various injecting parameters.The distribution of pressure and velocity were obtained.The results show that various cross-section and surface roughness of BHA would impact the flow field.The velocity reduced significantly with the increase of annulus area which caused cuttings deposition.With the constant injection pressure,whether or not to use back pressure is determined by flow distribution in wellbore.Velocity has to meet the requirements of cutting transport and lower than corrosion speed.Combined with the minimum velocity for cuttings transport and erosion velocity,the appropriate injecting parameters were obtained by comparative analysis.A simple and effective method for air drilling design was obtained.

关 键 词：空气钻井 注入参数 数值模拟 流场 Fluent软件 

分 类 号：TE242.6[石油与天然气工程—油气井工程]