DRILLING TECHOLOGY OF HU-71 MULTIPLE TARGETS DIRECTIONAL WELL

Hu 63 fault block in Zhongyuan oilfield has the characteristics of more steeper fault plane and thin oil zone due to the effect of Changgeng fault.It is difficult to drill all of the oil zones with only one well,so one multiple targets directional well was drilled.Hu-71 is a four targets directional well and its finished depth is 3543.54 meters,the maximum inclination is 42 degrees,the maximum displacement is 1059.72 meters.That is a directional well which has the most targets up to now at home.This paper introduced the well path control technology in details and preliminary research is conducted including the design of operation program,BHA force analysis,cutting carring,sand cleaning,collapsing and sticking protection technology and so on.