Surface Abandonment Challenge (Onshore)

Good day - I have a challenge I’d like to have some input on.
I need to cut several casing strings as part of an onshore well abandonment.
The strings I need to cut are:

1.       178mm 34.2 kg/m J55 – cemented to surface

2.       244.5mm 79.6kg/m L-80 – cemented to surface

3.       “Inner conductor”  406mm OD - 16” 0.312” wall line pipe (40 ksi?)

4.       “Outer Conductor” 509mm OD - 20” 0.375” wall line pipe (40 ksi?)  
   – no cement between the conductor pipes

Cut depth is about 10 meters (33 feet) below ground.

This is a very difficult to access location and since the well is already abandoned downhole, the client would like to evaluate a rig-less approach – likely helicopter borne (about a 5000lb weight limit per load).

Due to the cement sheath I assume that the first three casing strings must be cut & pulled together.
I have the following concerns/issues.

1.       The limitations of about a 156mm (6”) ID and a cut to 406mm (16”) diameter will mean stand-off issues for abrasive/water jet cutting methods.

2.       The traditional casing cutting methods that I am familiar with all require the rotation/torque capabilities of a rig (which I’m trying to avoid due to huge logistics issues).

8 Answer(s)

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