TM 5-3820-256-10
(d)
Insert the break-out fork to hold the drill collar. Remove the hoisting plug.
(e)
Operate the hoist drum and lower the kelly until the kelly sub joins the top of the drill collar. Operate
the rotary table counterclockwise to connect the drill collar to the kelly sub. Use the break-out wrench
on the drill collar and hold a back-up on the kelly. Torque the connection.
(f)
Raise the kelly slightly, remove the break-out fork, and lower the drill string until the kelly drive
bushings are engaged in the rotary table. Begin mud circulation and table rotation. Lower the kelly to
resume drilling. Drill down the kelly, using pulldown if required, as before.
(4) Add drill pipe (making connections).
(a)
Drill the kelly all the way down. Just before the kelly has completed its full travel, stop pulldown (if
being used), then stop table rotation. Do not stop the mud pump circulation until all the cuttings have
risen to the surface and after you have raised the kelly a few feet off the bottom of the hole.
(b)
Raise the kelly until the top of the drill collar extends above the top of the rotary table. Install the
break-out fork on the collar and lower the kelly. Use the break-out tongs to break the collar from the
kelly. Unscrew the kelly, raise and retract it into the mast.
NOTE
Drill collars supply extra weight on the bit. Several collars may be used. Add subsequent collars as the
first.
(c) Install the hoisting plug in the joint of drill pipe to be added to the string. Use the auxiliary drum line to
lift the drill pipe above the tool joint being held in the rotary table. (d) Apply tool joint compound on the
pipe threads; then lower the drill pipe into the tool joint.
(e) Rotate the rotary table to screw in and tighten the drill pipe to the drill string held in the rotary table. Lift
the drill string slightly and remove the break-out fork; then lower the drill string into the hole until the top
of the added pipe joint extends just above the rotary table.
(f)
Insert the break-out fork to hold the drill string. Remove the hoisting plug from the top pipe joint.
(g)
Operate the hoist drum and lower the kelly until the kelly sub joins the top of the drill pipe. Operate the
rotary cable counterclockwise
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