Downhole motor assembly
AssigneeNeyrfor-Weir Limited
InventorAndrew Downie
Life of this patent
Estimating the term…
Abstract
There is disclosed an improved downhole steerable motor assembly (5) and related method. A problem in known assemblies is that the distance from a bent housing bend axis to the face of a drill bit needs to be kept relatively short resulting in the length of the bearing package and its thrust capacity being restricted. Accordingly, the invention provides a downhole motor assembly (5) comprising a motor (115), at least one thrust bearing (116) and a bent portion (117), the assembly (5) having a first end (135) and a second end (140), the first end (135) being closer to surface than the second end (140), in use, wherein the bent portion (117) is closer to the second end (140) than is the at least one thrust bearing (116).
Claims29
A downhole motor assembly comprising a motor, at least one thrust bearing, and a bent portion, the assembly having a first end and a second end, the first end being closer to the surface than the second end, in use, wherein the bent portion is closer to the second end than is the at least one thrust bearing, and wherein the at least one thrust bearing bears between a body of the motor and an output shaft of the assembly.
A method of directional drilling of a wellbore comprising:
- providing a downhole motor assembly, the assembly comprising a motor, at least one thrust bearing and a bent portion, the assembly having a first end and a second end, the first end being closer to the surface than the second end, in use, wherein the bent portion is closer to the second end than is the at least one thrust bearing, and wherein the at least one thrust bearing bears between a body of the motor and an output shaft of the assembly;
- directionally drilling the well bore by means of the assembly.
A downhole motor assembly comprising a motor, at least one thrust bearing, and a fixed bent housing, the assembly having a first end and a second end, the first end being closer to the surface than the second end, in use, wherein the fixed bent housing is closer to the second end than is the at least one thrust bearing, and wherein the at least one thrust bearing bears between a body of the motor and an output shaft of the assembly.
A method of directional drilling of a wellbore comprising:
- providing a downhole motor assembly, the assembly comprising a motor, at least one thrust bearing and a fixed bent housing, the assembly having a first end and a second end, the first end being closer to surface than the second end, in use, wherein the fixed bent housing is closer to the second end than is the at least one thrust bearing, and wherein the at least one thrust bearing bears between a body of the motor and an output shaft of the assembly;
- and
- directionally drilling the well bore by means of the assembly.
Dependencies are inferred from the claim text.