This article describe the well status requirements for Onshore Rig Moves.
1. Well Status Prior to Rig Move from Old Location
The following barriers shall be in place in a development well:
- annuli full
- completions installed and tested
- Xmas tree installed and tested.
Annuli
All annuli shall have been topped up and all valves closed and valve handles removed.
All annuli pressures shall be bled off and the annuli topped up.
The tubing/casing annulus shall be full of completion fluid with sufficient density to control the reservoir pressure.
Completions
A plug and prong shall be installed and inflow tested in the “F” nipple below the production packer.
The sliding side door across any selective interval shall be inflow tested, this will happen simultaneously while inflow testing the wireline plug in the “F” nipple.
A BPV shall be installed in the tubing hanger and pressure tested by pressurising the tubing below the plug to 2 000 psi and checked for inflow.
Note: Volume pumped during pressurisation shall be considerably more, compared with the volume returned observed during the inflow test.
X-mas Tree
All valves on the Xmas tree shall be closed and valve handles removed.
In case no Xmas tree has been installed, a standard size gate valve with a bore conforming to the ID of the tubing should be installed to allow the installation of a standard wellhead adapter to enable wireline operations.
The gate valve shall be capped with a blind flange with a 1/2in NPT needle valve and pressure gauge.
2. Condition of Location After Rig has moved off
After the rig has been moved off location, the Drilling Supervisor shall ensure that:
- the cellar has been cleaned and drained out
- the rat hole has been back filled with solid material
- all debris has been removed from the location and dumped in the waste pit
- the sewage pit has been back filled
- all gate valves on the casing head spool and tubing head spool are closed
- the location is clean and the pits have been re-filled after the rig has moved off location.
3. Well Status With Suspected Tubing Leaks
Able to Set Plug and Prong in “F” Nipple
A plug and prong shall be set in the “F” nipple below the lower most packer.
The tubing and annulus shall be circulated to kill fluid of sufficient density to control the reservoir.
A BPV shall be installed in the tubing hanger and pressure tested from below via the tubing/casing annulus.
Unable to Set Plug and Prong in “F” Nipple
The tubing and annulus shall be circulated/bull headed to kill fluid of sufficient density to control the reservoir.
A BPV shall be installed in the tubing hanger and pressure tested from below via the tubing/casing annulus to a pressure not exceeding the pressure observed during bull heading.