Well drilling apparatus
AssigneeMaritime Hydraulics AS
InventorBjarne E. Skeie
Life of this patent
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Abstract
A well drilling apparatus of the type suspended from a travelling block in a derrick for movement upwardly and downwardly with a drill string. The apparatus includes an upper nonrotatable unit comprising a drive meter for rotation of a hollow drive shaft connectable to the drill string. The apparatus further includes a lower unit or pipe handler apparatus, the lower unit being rotatable relative to the upper unit, preferably by a motor. The apparatus also includes a swivel transferring compressed air and/or hydraulic fluid from the upper non-rotatable unit to the lower rotatable unit.
Claims6
A well drilling apparatus of the type suspended from a travelling block of a derrick for movement upwardly and downwardly with a drill string to perform drilling and round trip operations, said apparatus including:
- an upper unit comprising drive means for rotating a hollow drive shaft connectable to said drill string;
- means retaining said upper unit against rotation;
- a pipe handler apparatus comprising:
- a link hanger from which two links support an elevator, and a torque wrench for connecting and disconnecting said drive shaft and drill string;
- mounting means for allowing said pipe handler apparatus to independently rotate relative to said upper unit to any angular position or desired number of revolutions;
- and
- swivel means for transferring operating fluids such as compressed air and hydraulic fluid, between said upper unit and said pipe handler apparatus.
Dependencies are inferred from the claim text.