Abstract: A bearing assembly for a downhole mud motor has a transitional radial support in the form of a transitionally tapered bearing mandrel. The new radial support includes a generally cylindrical bearing housing having an upper end facing upstream in the direction of the drill string and a lower end, an outer cylindrical surface and an inner cylindrical surface, and wherein a portion of the inner cylindrical surface surrounds and contains a plurality of axial bearings. The bearing mandrel underlies the bearing housing and has an outer surface which defines a lower bearing region. The lower bearing region including a series of stepped outer diameter regions that also define a transitional reduction in cross-section area for the lower bearing region of the mandrel which, in turn, allows the bearing mandrel to have a progressive reduction in bending strength and to become a more active element in bending strength of the mud motor, instead of relying primarily upon the bearing housing.

Abstract: A sonde housing for horizontal directional drilling includes a cylindrical housing body with walls defining a longitudinal cavity. A lid is provided for covering the cavity in the housing body. A series of tabs on the lid longitudinal side surfaces are engaged in mating grooves provided in the housing body to secure the lid on the housing body. A further independent locking member also engages the lid and housing body.

Abstract: A filter screen assembly is shown for filtering drilling mud used during oil and gas well drilling operations. The filter screen assembly is installed at the surface of a well on the discharge side of the mud pump at ground level. The filter screen assembly is installed upstream of the rig swivel, rotary hose and Kelly and downstream of the discharge from the mud pump. Since it is located at ground level, it does not pose the safely hazard associated with elevated components. It does not need to be removed and reinstalled when additional segments are added to the drill string and is always easily accessible for routine maintenance or replacement.