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Pilot Milling

This document provides procedures for pilot milling operations and describes the pilot milling bottomhole assembly. Key steps include checking components for size compatibility, starting rotation while pumping to clean the hole, and milling the casing at 5 to 6 feet per hour. The bottomhole assembly consists of tapered mills, drill collars, shock subs, and other tools to mill through the casing and centralizers.

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Shaikh Sabir Hussain
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285 views1 page

Pilot Milling

This document provides procedures for pilot milling operations and describes the pilot milling bottomhole assembly. Key steps include checking components for size compatibility, starting rotation while pumping to clean the hole, and milling the casing at 5 to 6 feet per hour. The bottomhole assembly consists of tapered mills, drill collars, shock subs, and other tools to mill through the casing and centralizers.

Uploaded by

Shaikh Sabir Hussain
Copyright
© © All Rights Reserved
We take content rights seriously. If you suspect this is your content, claim it here.
Available Formats
Download as DOC, PDF, TXT or read online on Scribd
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PILOT MILLING PROCEDURES

1) Check casing ID and coupling OD

2) Check blade OD against the above.

3) Trip in with assembly.

4) Record Wt up _____ Wt dn _____ Wt Rotating ______ Torque rotating_____


Pump strokes _____ Pump pressure _______

5) Start rotating and bring in the pump to maintain good hole cleaning.

6) Mill the casing at approx 5 to 6 ft pr / hr.

7) If milling slows up and depth indicates that the mill is not on a collar
it is possible that part of the previous collar is around the mill.

8) Trip out and change the mill.

PILOT MILL BHA


1 Taper mill
2 Bit sub.
3 8 ½ “ String Stab.
4 8 ½ “ String Stab.
5 Pilot mill or Barracuda.
6 Shock sub
7 5 x 8” Drill collars
8 Drilling Jar
9 2 X 8” Drill collars
10 X/O
11 Accelerator
12 X/O
13 6 x HWDP.
14 DP to surface.

RPM------- 100 / 220


WOB-------5 / 10 k
GPM-------- 800 6” liners 180 spm
6 ½ “ liners 160 spm.

Mud minimum YP 30. Barracuda should mill past any cut section providing
Light Wts and High RPM’s. If irregular torque after pass in cut out section
Pos blades are uneven knock back pumps and set down Wt to try and even blades
Also if milling with csg centralisers the centraliser will be just under the collar.

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