塔河油田TK665CH井卡拉沙依组锻铣侧钻水平井技术

近年来，在塔河油田老区直井基础上进行φ177.8 mm套管开窗（φ149.2 mm井眼）侧钻是主要开发方向之一。石炭系卡拉沙依组锻铣开窗存在循环压耗大，铁屑上返排量窗口窄，铁屑容易在锻铣套管上窗口堆积，易发生铁屑憋泵、缠刀、退刀困难，侧钻时地层压实性好，机械钻速低，井壁掉块卡钻，穿越两套压力体系井漏，摩阻扭矩大等复杂情况。在TK665CH井石炭系卡拉沙依组φ177.8 mm套管锻铣开窗侧钻施工中，通过钻头、钻进参数、导向马达、钻具组合的优选，轨迹的监控以及针对性的泥浆技术，侧钻获得成功，为塔河油田老井改造及定向侧钻积累了成功的经验。

Horizontal Well Sidetracking by Milling in Kalashayi Formation of Tahe Oilfield

Sidetracking in 177.8mm case is one of the main development directions for vertical wells in old Tahe oilfield in recent years.Sidetracking in carboniferous kalashayi formation,iron scraps accumulate in the case opening because of large circulating pressure loss and narrow window for upward iron scraps,which bring high pump pressure,tangle cutter and difficult cutter backstroking;formation compactibility makes low penetration rate and blocking;penetrating 2 different pressure systems of carboniferous and ordovician causes lost circulation,large torque and drag.By the optimization of bit,drilling parameter,steerable motor and drilling tool assembly and by the trajectory monitoring and mud technique,sidetracking was successfully completed for old well reconstruction in Tahe oilfield.