气体钻水平井岩屑运移数值模拟研究  

Numerical Simulation for Cuttings Migration during Gas Drilling of Horizontal Wells

作　　者：李皋[1] 肖贵林[1] 李小林 李诚[1] 

机构地区：[1]油气藏地质及开发工程国家重点实验室(西南石油大学),四川成都610500 [2]中国石油渤海钻探工程有限公司塔里木钻井分公司,新疆库尔勒841000

出　　处：《石油钻探技术》2015年第4期66-72,共7页Petroleum Drilling Techniques

基　　金：国家自然科学基金重点项目"气体钻井技术基础研究"(编号:51134004);国家科技重大专项"低渗气藏复杂地层高效钻井关键技术"(编号:2011ZX05022-005)资助

摘　　要：针对气体钻水平井过程中的井眼净化问题,开展了水平段岩屑运移特征研究。基于气固两相流动模型,采用FLUENT软件模拟了气体钻井条件下不同粒径、不同注气量、不同钻杆转速和不同钻杆偏心距下单颗粒岩屑和岩屑颗粒群在水平环空的运移特性。模拟结果表明,单颗粒岩屑在水平环空的运移以跃移形式为主,而岩屑颗粒群的运移主要包括蠕移和跃移两种形式;粒径5.0mm岩屑在注气量50,70和90m3/min下的首次跳跃距离分别为0.55,0.90和1.50m;在注气量为50m3/min时,粒径1.5mm岩屑的首次跳跃距是粒径3.0mm岩屑的1.5倍;粒径7.0mm岩屑在钻杆静止和转速为60r/min下的第3次跳跃距离分别为0.43和0.62m;粒径6.0mm岩屑在偏心距0,10和15mm条件下的第2次跳跃距离分别为0.55,0.44和0.28m。研究表明,注气量越大、粒径越小、偏心距越小、钻杆转动越快,则岩屑运移的距离越远。建议采取适当提高注气量、安装水平井井眼净化工具、提高钻杆居中度等措施,以提高井眼净化效果。To enhance the hole-cleaning performance during gas drilling of horizontal wells,research has been conducted for characteristics of cutting migration in horizontal sections.Based on the gas-solid flow model,the migration characteristics of single-particle cuttings and multi-particle cuttings were simulated using FLUENT at different diameters,gas injection rates,rotating speeds and eccentric distances of drillpipe.The results showed that in a horizontal annulus,single-particle cuttings mainly migratedin saltation,while multi-particle cuttings migrated in creep and saltation.For the gas injection rates of 50 m^3/min,70 m^3/min and 90 m^3/min,the first saltation distances of 5mm diameter cuttings were 0.55 m,0.90 mand 1.50 mrespectively.For the gas injection rate of 50m^3/min,1.5mm diameter cuttings＇ first saltation distance is 1.5times of 3.0mm diameter cuttings.For the rotating speeds of 0r/min and 60r/min,the third saltation distances of 7.0mm diameter cuttings were 0.43 mand 0.62 mrespectively under the gas injection rate of 50m^3/min.For the eccentric distances of 0mm,10 mm and 15 mm,the second saltation distances of 6mm diameter cuttings were 0.55 m,0.44 mand 0.28 mrespectively under the gas injection rate of 50m^3/min.Therefore,the faster gas injection rate,the smaller diameter of cuttings,the faster rotating speed and the smaller eccentric distance,the further would cuttings be removed.Taking measures such as improving gas injection rate appropriately,installing a hole cleaning device for horizontal well and moderating drilling pipe could benefit the hole cleaning efficiently.

关 键 词：气体钻井 水平井 岩屑运移 数值模拟 粒径 注气量 转速 

分 类 号：TE21[石油与天然气工程—油气井工程]