关键词: 定向钻井, 钻具组合, 钟摆钻具, 钻井导向器, 井眼轨迹, 井身质量

Abstract: This paper gives an analsis of BHA with shell-type azimuth controller which can be used effectively and reliably in a com0entional rotary drilling assembly to correct the azimuth or to counteract the formation walking tendency to maintain the angle in dizoectional drilling.Numerous field runs has been carried out in more than 60 wells in sii fields in China.The results are quite encouraging.With an average correcting ability of 1.5/30m measured depth.As compared with the cost of using a downhole mud motor and orientation tool,the cost saving would be considerable.