Guidelines for Drilling Out

Cement, Plugs and Casing Shoe

1. Check the type of shoe track to see if it is PDC drillable or not, plan and define parameters accordingly.
2. Confirm the theoretical top of cement and top plugs. Make sure are communicated during the pre-job meeting.
3. Avoid running small jet sizes <10/32” to avoid plugging the jets.
4. Advise client not to test the casing though annulus since this will cause an incremental differential pressure to
the tools below the float valve or push debris inside them. (Xceed, IMPulse mainly).
5. Consider the following MOC and Escalation triggers in the risk analysis, since most of them may cause tool
failures or bit/casing damage or stuck pipe issues.
Risk Low Medium High
Safe Operation QHARC required MOC and client
acceptance required

Pad activation pressure

<500 psi 500-600 psi >600 psi
drop
Design

Length of rathole from

< 20 ft 20-30 ft > 30 ft
previous hole size

Distance above TOC at

which we start > 200 ft 100 – 200 ft < 100 ft
controlling trip speed

Bumped Plug Yes -- No

Controlled drilling
parameters in length of
<15ft < 20 ft >20ft
new formation if S&V
observed

Plug Spinning Non-rotating plugs

-- Rotating plugs used
used

DLS along the float to the

casing shoe <1 1-3 >3

If any of the risks described above fall within the high zone, a conventional BHA should be the main
proposal from D&M.

RSS and Rotary BHA’s Xceed Bellows Burst Avoidance

Recommended Drilling Parameters: (*)
Operation SWOB SRPM Flow Rate Drilling with an Xceed through the shoe and accessories needs special
(gpm/in of bit attention due to its differential pressure specification:
diameter
1. After the shoe is drilled, don’t drill ahead, reciprocate the bit across
Milled Tooth 2000 lbf/in of the shoe to clear the float material.
40 - 60 30 - 50
Casing Drill Out bit diameter 2. Drill ahead until the second Xceed stabilizer passes across the
shoe (rate hole plus ten feet of new formation).
TCI Casing Drill 2500 lbf/in of 3. Drill the rat hole with controlled ROP in order to make sure cuttings
40 - 60 30-50
Out bit diameter are clear and avoid pack offs.
4. Avoid picking up off bottom if an increase of pressure is seen.
PDC Casing Drill (50-60)
5. Directional driller should always be on the rig floor while drilling the
Out 16” Section Maintain above
5 – 30 KIbf 40 - 60 the MWD, Motor float.
& RSS minimum
FR
Motor BHA
Execution

PDC Casing Drill 5 – 24 KIbf 40 - 60 (50-60)

Out 12”to 12 ¼” Maintain above
Section the MWD, Motor
& RSS minimum Drilling with a motor requires special considerations as the ones below:
FR
1. Avoid using aggressive PDC bits with light set of cutters and high
PDC Casing Drill 5 –15 KIbf 40 - 60 (50-60) narrow blades, since they are prone to damage due to lateral
Out 8 3/8” to 8 Maintain above vibrations induced by the high bit speed when using a motor.
½” Section the MWD, Motor 2. Do not exceed 20-40 SRPM.
& RSS minimum
FR
3. Do not reduce the flow rate below the operational limit of the motor
to minimize the bit speed. This may allow the motor to stall out
PDC Casing Drill 5 – 10 KIbf 40 - 60 (30-40) prematurely due to reduced power output.
Out 5-7/8” to 6 Maintain above 4. Keep differential pressure below 200 psi.
1/8” Section the MWD, Motor 5. Do not spud the bit in an attempt to break or engage the plug, or the
& RSS minimum shoe. The motor may stall and damage the bit. If the motor stalls,
FR follow the standard recovery procedures described in PPK IT#
6866247
For Power Drive BHA’s, control the flow rate to limit the strength of pad 6. After drilling the float and shoe, circulate clean and trip back
activation inside casing and set the tool in neutral if using Xceed set it at 0% through the shoe without string rotation, to confirm that the shoe
steering. track diameter is full-gauge before proceeding.
(*) The drilling parameters may adjusted based on the actual lateral/axial
shocks observed downhole

Stick and Slip from magnetometers are not reliable while inside/nearby the casing since they are magnetically interfered. Lateral
shocks coming for PowerDrive’s are also affected by magnetic interference due to iLink RT transmission
While drilling spinning plugs:
DO:
- Check the maximum weight on bit that can be applied to the bit and BHA, if DON’T:
using a motor check the maximum differential pressure. - “Burn the plug” – rotating the bit at very high RPM with minimal SWOB, no
- Make sure rotation is applied gradually while increasing the SWOB. flow or low flow below our telemetry data.
- Pay close attention to the torque to see if the plug has been engaged. - “Hammer the plug to engage it” – pick up of bottom and come back with high
- If the practices mentioned in the DON’T column are applied please record slack speed, then rotate the bit.
them in BRS and escalate it to town, since they may damage the bit and BHA

Version 5.0 Updated by: Mohammed Elsadig Approved by: Ahmed Osman