Abstract: To develop the remaining oil and enhance oil recovery, Zhongyuan Oilfield arranged the treatment of drilling the Wei 117 well. Wei 117 well was featured by large extension, difficultly controlled trajectory, high demand of lubrication to prevent plugging, and difficult drilling and completion treatment. Because of the large extension, the profile type of “direct-up-slow-up-horizontal” was taken. The treatments of monitoring while drilling and trajectory prediction were strengthened to adjust the drilling mode timely and to improve the profile coincidence rate. High speed roller bit and single curve screw were matched to drilling the well. BHA and drilling parameters were optimized to guarantee the control of directional profile. The silanol drilling fluid was taken, and the flowing pattern was adjusted timely, to improve the lubrication and suspension capacity of drilling fluid, what is more, to make sure the stable wellbore. Regular short trip was taken to remove sands, safe operation and completion preparing treatment were stressed, to guarantee safe completion. The success on the well supply a reference for the treatment on the similar wells.