随钻扩眼对钻井液循环特性的影响
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摘要
随钻扩眼作业会对钻井液循环特性产生影响,但国内尚缺乏相关研究。针对该问题,基于计算流体力学方法开展数值仿真,研究了直线形刀翼的扩眼直径、刀翼倾斜角两参数对钻井液循环的影响规律。研究结果表明:在扩眼器刀翼切削位置,随着刀翼扩眼直径的增大,钻井液流场的低速区域不断增大,当扩眼直径大于特定值时,流场低速区域将急剧增大;随着刀翼倾斜角的增大,钻井液流场的低速区域呈现出先减小再增大的变化规律;对?215.9 mm(■in)扩眼器的刀翼,最优倾斜角为55°,最优扩眼直径为250 mm。研究结果对于随钻扩眼器刀翼结构参数的设计具有指导意义。
The operation of reaming while drilling will have an impact on the circulation of drilling fluids, but there is still no relevant research in China. To address the problem, numerical simulation based on computational fluid dynamics was carried out to study the influence of reaming diameter and blade angle of straight blade reamer on drilling fluid circulation. The results show that at the cutting position of the reamer blade, as the diameter of the reaming hole increases, the low velocity region of the drilling fluid flow field increases continuously. When the diameter of the reaming hole is larger than a specific value, the low velocity region of the flow field will be increased sharply. As the blade angle increases, the low velocity region of the drilling fluid flow field exhibits decrease and then increase change. For the blade of the ?215.9 mm(■ in) reamer, the optimal angle is 55° and the optimal reaming diameter is 250 mm. The study could provide guidance for the design of the structure parameters of reamer.
The operation of reaming while drilling will have an impact on the circulation of drilling fluids, but there is still no relevant research in China. To address the problem, numerical simulation based on computational fluid dynamics was carried out to study the influence of reaming diameter and blade angle of straight blade reamer on drilling fluid circulation. The results show that at the cutting position of the reamer blade, as the diameter of the reaming hole increases, the low velocity region of the drilling fluid flow field increases continuously. When the diameter of the reaming hole is larger than a specific value, the low velocity region of the flow field will be increased sharply. As the blade angle increases, the low velocity region of the drilling fluid flow field exhibits decrease and then increase change. For the blade of the ?215.9 mm(■ in) reamer, the optimal angle is 55° and the optimal reaming diameter is 250 mm. The study could provide guidance for the design of the structure parameters of reamer.
引文
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[11] 王延民,唐继平,胥志雄,等.控压钻井井筒压力控制技术初探[J].特种油气藏,2011,18(1):132-134,142.WANG Y M,TANG J P,XU Z X,et al.An approach to annular pressure control by managed pressure drilling[J].Special Oil & Gas Reservoirs,2011,18(1):132-134,142.
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[13] 李作会,孙浩玉,陈超.低黏度液流携带粒子在环空中返流的仿真研究[J].石油机械,2013,41(11):44-48.LI Z H,SUN H Y,CHEN C.Simulation research on reflux of low-viscosity liquid flow carrying particles in annulus[J].China Petroleum Machinery,2013,41(11):44-48.
[2] 张燕.■TGX-K型套管下部随钻扩孔器的设计[D].青岛:中国石油大学(华东),2011.ZHANG Y.Design of ■TGX-K type of enlarge-while-drilling tool under the casing [D].Qingdao:China University of Petroleum(Huadong),2011.
[3] 范亚民,张永泽,栾苏,等.国外扩张式随钻扩眼工具应用现状及发展趋势[J].石油矿场机械,2011,40(12):25-28.FAN Y M,ZHANG Y Z,LUAN S,et al.Application status and trends of foreign expandable reaming tool while drilling[J].Oil Field Equipment,2011,40(12):25-28.
[4] 卫国.钻柱中加接扩孔器解决缩径卡钻[J].西部探矿工程,1997,9(1):14-15.WEI G.Reaming machine added to solve diameter-shrinkage bit blocking in drilling [J].West-China Exploration Engineering,1997,9(1):14-15.
[5] 周伟,于洋,刘晓民,等.小间隙固井合理扩眼尺寸研究[J].石油机械,2013,41(6):28-30.ZHOU W,YU Y,LIU X M,et al.Research on rational reaming size in small-gap cementing[J].China Petroleum Machinery,2013,41(6):28-30.
[6] 胡国清,李玲.小间隙套管程序使用的底部钻具组合[J].石油机械,2001,29(1):51-54.HU G Q,LI L.Bottomhole assembly for small gap casing program [J].China Petroleum Machinery,2001,29(1):51-54.
[7] 王廷瑞,李亚方,王立苹,等.侧钻井扩孔复杂情况处理技术探讨与完善[J].特种油气藏,2009,16(3):95-98,110.WANG T R,LI Y F,WANG L P,et al.Research and improvement of complexity treatment techniques for sidetracked hole reaming [J].Special Oil and Gas Reservoirs,2009,16(3):95-98,110.
[8] 李刚,艾尼瓦尔,雷宇,等.表层套管钻井技术在红山嘴油田的应用[J].石油钻采工艺,2014,36(5):22-23.LI G,ANWAR,LEI Y,et al.Application of surface casing drilling technology in Hongshanzui Oilfield [J].Oil Drilling & Production Technology,2014,36(5):22-23.
[9] 邓小卫,汪露.浅谈超深井定向随钻扩孔工艺优化技术[J].石油工业技术监督,2018,34(3):30-33.DENG X W,WANG L.Discussion on optimization of directional reaming while drilling process in ultra-deep well[J].Technology Supervision in Petroleum Industry,2018,34(3):30-33.
[10] 吕振虎,陈平,马天寿.精细控压钻井中环空不稳定流动时间响应分析[J].石油天然气学报,2014,36(11):120-125.LYU Z H,CHEN P,MA T S.Time response analysis of unstable flow in annulus affected by back pressure change[J].Journal of Oil and Gas Technology,2014,36(11):120-125.
[11] 王延民,唐继平,胥志雄,等.控压钻井井筒压力控制技术初探[J].特种油气藏,2011,18(1):132-134,142.WANG Y M,TANG J P,XU Z X,et al.An approach to annular pressure control by managed pressure drilling[J].Special Oil & Gas Reservoirs,2011,18(1):132-134,142.
[12] 王鄂川,樊洪海,党杨斌,等.环空附加当量循环密度的计算方法[J].断块油气田,2014,21(5):671-674.WANG E C,FAN H H,DANG Y B,et al.Calculation method of additional equivalent circulating density[J].Fault-Block Oil & Gas Field,2014,21(5):671-674.
[13] 李作会,孙浩玉,陈超.低黏度液流携带粒子在环空中返流的仿真研究[J].石油机械,2013,41(11):44-48.LI Z H,SUN H Y,CHEN C.Simulation research on reflux of low-viscosity liquid flow carrying particles in annulus[J].China Petroleum Machinery,2013,41(11):44-48.