Downhole motor assembly

Details Downhole motor assembly Downhole motor assembly

1985-07-18

1987-03-03

Novosad, Stephen J.

Boring or penetrating the earth

With below-ground tool drive prime mover

Fluid rotary type

175320, E21B 402

Patent

active

046468560

ABSTRACT:
A rigid, stiffened downhole motor assembly for drilling a vertical wellbore of increased straightness wherein substantially more weight can be applied to the drill bit driven by the motor without subjecting the case of the motor to those compressive and/or bending forces previously experienced by known downhole motors in similar drilling operations. The present assembly comprises a housing of heavy-walled conduit which is coupled to the lower end of a tool string. A downhole motor, e.g. a "mud" motor is positioned within the housing and is operably coupled thereto by a means which allows the weight of the housing to be transferred to the drill bit without subjecting the motor case to compressive or bending forces. Also, an annulus is provided between the housing and the case of the motor so that a greater volume of drilling fluid can be flowed through the tool string to thereby provide better cooling of the bit and better removal of cuttings from the wellbore.

REFERENCES:
patent: 2944792 (1960-07-01), Gros
patent: 3598187 (1971-08-01), Mothre

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