Abstract: A float collar 10 includes a housing 12 and a generally sleeve-shaped elastomer 20. The lower plate 30 and an upper plate 32 are each supported on an elongate rod 22, and at least one of the plates is axially fixed relative to the tubular housing. The plate intended for exposure to fluid pressure includes a plurality of arcuate flow ports 34 for communication with the annulus between the tubular housing and the elastomer prior to swelling of the elastomer.

Abstract: A float collar 10 includes a housing 12 and a generally sleeve-shaped elastomer 20. The lower plate 30 and an upper plate 32 are each supported on an elongate rod 22, and at least one of the plates is axially fixed relative to the tubular housing. The plate intended for exposure to fluid pressure includes a plurality of arcuate flow ports 34 for communication with the annulus between the tubular housing and the elastomer prior to swelling of the elastomer.

Abstract: A waterjet machining process and system applied to a heat-treated hollow device for cutting a predetermined pattern therein. The hollow device is mounted in the holder that applies rotational, axial, and transverse movements to the hollow metal device as needed in relation to an abrasive water cutting jet stream to cut a predetermined pattern therein. The pattern may be digitized and stored in a computerized numerical controller for moving the holder as necessary to cut the predetermined pattern therein. Inserts may be provided within the hollow device when cutting asymmetrical patterns to protect the inside diameter wall opposite the waterjet from erosion.

Abstract: A bearing section for a downhole motor that is coupled to a drill pipe string and that has a power section, a bearing section and a drill bit section. The improved bearing section includes a first drilling fluid lubricated bearing assembly being located between inner and outer cylindrical members, a second fluid sealed bearing assembly above said first drilling fluid lubricated bearing assembly between the inner and outer cylindrical members to prevent drilling fluid from the power section from directly reaching the first drilling fluid lubricated bearing assembly from within the inner and outer cylindrical members, and at least two orifices in the outer cylindrical member in the vicinity of the first bearing assembly for allowing drilling fluid exiting from said drill bit to enter therein and exit therefrom to lubricate the first bearing assembly.