Page 413 - Practical Well Planning and Drilling Manual

Section 3 revised 11/00/bc 1/17/01 12:00 PM Page 389

3.4.4
Casing [ ]

has properly started. Coat the next joint pin end, stab in, and make up
with the power tong using a rig tong as backup. Repeat for the remain-
ing shoetrack connections below the float collar. (If possible, breaking
out the collars and pipelocking them can be done in advance on the
pipe rack, which will save time.) When making up the joints in the
rotary table using pipelock, make them up to the triangle and record
the make-up torque for later when the shoetrack is drilled out. (To drill
out the shoetrack, the off-bottom rotating torque with the drilling
assembly at the casing plugs is taken. The torque while drilling the
shoetrack is then restricted to 50% of the make-up torque plus the off-
bottom rotating torque.)
Extra casing collars should be ordered in case a collar is damaged
backing off or galled when made up again.
Apply the safety clamp (or use a spare single joint elevator above
the slips) before removing the elevators until there is 25,000 lbs hook
load (not including block weight). Fill each joint with mud. Monitor
pit gain while running casing to spot losses or gains from the hole.
Change to spider slips and elevators before entering open hole.
Once at depth, count the joints remaining (including any unused
due to joint damage) and check that this is correct against the running
list. Rig up the loaded cement head and wash down the last joint if nec-
essary. Note up and down drags and any fill. Establish circulation and
slowly increase, monitoring for losses. Circulate 120% of the casing
contents at the highest no-losses rate to ensure that the casing is clear
of debris, which would block the float. If using a slip and seal-type
hanger, the casing can be reciprocated during circulating and displac-
ing cement to assist mud removal by preventing gelling in washouts or
eccentric annuli. This can also be done with a solid hanger, as long as
the hole is in good condition with little risk of getting stuck with the
casing not landed. Once the solid hanger has been finally landed, close
the annular preventer and pressure test above to 500 psi for 10 min-
utes. If this test is good then the stack can be nippled down after
cementing without waiting on surface samples.
Running list example. Prepare the casing running list from the
tally. Mark the locations of centralizers, accessories, crossovers, etc.
The tally should also give, for each joint, depth in the hole while run-
ning and final depth in the well when landed. Refer to the example

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