Adjustable Bend Assembly for a Downhole Motor

摘要

A downhole motor for directional drilling includes a driveshaft assembly including a driveshaft housing and a driveshaft rotatably disposed within the driveshaft housing. In addition, the downhole motor includes a bearing assembly including a bearing housing and a bearing mandrel rotatably disposed within the bearing housing. The bearing mandrel has a first end directly connected to the driveshaft with a universal joint and a second end coupled to a drill bit. Further, the downhole motor includes an adjustment mandrel configured to adjust an acute deflection angle θ between the central axis of the bearing housing and the central axis of the driveshaft housing. The adjustment mandrel has a central axis coaxially aligned with the bearing housing, a first end coupled to the driveshaft housing, and a second end coupled to the bearing housing.

主权项

1. A downhole motor for directional drilling, comprising:
a driveshaft assembly including a driveshaft housing and a driveshaft rotatably disposed within the driveshaft housing; wherein the driveshaft housing has a central axis, a first end, and a second end opposite the first end; wherein the driveshaft has a central axis, a first end, and a second end opposite the first end; a bearing assembly including a bearing housing and a bearing mandrel rotatably disposed within the bearing housing; wherein the bearing housing has a central axis, a first end comprising a connector, and a second end opposite the first end; wherein the bearing mandrel has a central axis coaxially aligned with the central axis of the bearing housing, a first end directly connected to the second end of the driveshaft with a universal joint, and a second end coupled to a drill bit; an adjustment mandrel configured to adjust an acute deflection angle θ between the central axis of the bearing housing and the central axis of the driveshaft housing; wherein the adjustment mandrel has a central axis coaxially aligned with the central axis of the bearing housing, a first end, and a second end opposite the first end; wherein the first end of the adjustment mandrel is coupled to the second end of the driveshaft housing and the second end of the adjustment mandrel is coupled to the first end of the bearing housing.