Drilling assembly
OwnerBrent A. Clarkinventor
Life of this patent
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Abstract
An assembly for use in drilling in earth borehole using a drill string including a drill bit comprising a first downhole motor having a rotor operatively connected to said drill bit, a second downhole motor distal said first downhole motor, said second downhole motor having a rotor with a passageway therethrough and a bypass valve operatively connected to the second downhole motor, the bypass valve having a first position permitting drilling fluid to flow through said passageway and a second position wherein drilling fluid is prevented from flowing through said passageway.
Claims6
An assembly for use in drilling an earth borehole employing a drill string, a drill bit comprising:
- a first downhole motor having an upper end and a lower end, a first rotor and a first stator, said lower end of said first downhole motor being proximal and operatively connected to said drill bit;
- a second downhole motor having an upper end and a lower end, a second rotor and a second stator, said second rotor having a passageway therethrough and being distal said drill bit;
- a bypass valve operatively connected to said upper end of said second downhole motor, said bypass valve being selectively movable from a first position wherein a drilling fluid can flow through said passageway in said second rotor to a second position wherein said drilling fluid is prevented from flowing through said passageway in said second rotor.
Dependencies are inferred from the claim text.