DESCRIPCIÓN DEL PUESTO
V. Perfil del puesto
1.1 Check that the work permit held by the Well Test Supervisor fully covers the scope of the operation.
1.2 Ensure that the equipment to be tested is rated to the proposed test pressure.
1.3 Use water as the pressure testing medium and as far as possible ensure there is no air trapped in the equipment under test.
1.4 Always increase pressure slowly in steps to the final pressure.
1.5 Ensure that all areas exposed to high pressure are roped off. A P/A announcement detailing the areas where High Pressure Testing will be taking place must be made before the start of the operation.
Note
BPPD HSEQ Policy allows for a competent person to approach and visually inspect an item under test so long as the equipment has been subject to the particular pressure for 5 minutes, a state of equilibrium has been achieved and the test medium is water.
1.6 Ensure that the standby boat or rescue craft is in position/on alert whenever personnel are working over the side of the rig. This includes any work on the flare booms.
1.7 Prior to pressure testing the PE must walk the lines to check that all the equipment and lines are made up according to the P&ID diagram and that all lines to be pressure tested are chained down.
1.8 Before flushing through the burners, check that the standby boat/ rescue craft have moved clear.
1.9 During flushing and pressure testing, if there are any unexpected pressure build ups, bleed pressure off via the cement unit & check the line up of all valves.
BP EXPLORATION (XEU) WELL TESTING PROCEDURES MANUAL
SECTION 2110
SUBJECT PRESSURE TESTING SURFACE EQUIPMENT
REVISION 0
DATE 01/10/92
2. PREPARATION
2.1 Rig up a chicksan line from the choke manifold to tie into the cement pump. (This normally means tying into the rig manifold)
2.2 Check the example pressure testing procedure against the P&ID drawings. Recheck the procedure on site against the physical equipment.
2.3 Walk the lines to check that they are made up according to the P&ID diagram and that all lines are chained down.
out of both oil burners and both gas lines, check that the separator is full of water. If necessary close the separator oil and water outlets for a short time to completely fill the separator. Check lines and equipment for leaks.
Stop pumping immediately if there is any pressure build up. Bleed pressure off via the cement unit, then check position of valves.
3.3 By-pass the heater and separator as follows:
HEATER - close inlet valve
3.4 With the standby boat on station fit burner plugs/caps to the starboard burner and set cement unit relief valve to 1300 psi.
3.7 On successful completion of the previous test, bleed off pressure via the cement unit and remove burner plugs/caps. Open oil line diverter valves and flush through to confirm that
Pressure test separator body, separator by-pass line valves and upstream lines to 1,100 psi for 10 minutes.
BP EXPLORATION (XEU) WELL TESTING PROCEDURES MANUAL
SECTION 2110
SUBJECT PRESSURE TESTING SURFACE EQUIPMENT
REVISION 0
DATE 01/10/92
3.10 On successful completion of the previous test, bleed off pressure via the cement unit.
Install blank plug in the heater choke Open heater outlet valve
Set cement unit relief valve to psi.
Pressure test upstream heater coil and upstream lines to psi for 10 minutes.
3.11 On successful completion of the previous test and while still holding pressure.
Close choke manifold back valves
Bleed off pressure at the cement unit to 500 psi.
Monitor pressure at the cement unit for 10 minutes.
3.12 On successful completion of the previous test, bleed off all pressure.
Remove blank plug from heater choke Open heater by-pass valve
Close heater inlet valve
Close choke manifold back valves Set cement unit relief valve to psi.
Pressure test choke manifold body and back valves to psi for 10 minutes.
3.13 Bleed off pressure at the cement unit.
END OF PRESSURE TESTING
3.14 Make tannoy announcement that "HIGH PRESSURE TESTING IS NOW COMPLETE".
- Confirm that the equipment is fit for the pressure duty it may be subjected to during the well test
- Confirm that flow can be diverted through the system as required.
Note
No external leaks in the surface equipment however small are tolerable.
4.2 High pressure pilots should be set to 90% of the pressure test value.
4.3 The separator and lines downstream of the separator should be pressure tested to create an operating envelope of at least 0 - 1000 psi. To do this it is necessary to pressure test the separator to 1100 psi to allow the high pressure trip to be set at 1000 psi. On high flow rate wells it may be necessary to pressure test the separator to a value closer to its rated working pressure (1440 psi).
4.4 Where possible the lines to the heater choke should be rated and pressure tested to allow full WHCIP at the heater choke.
4.5 Where sand filters are installed upstream of the choke it is often necessary to install an additional valve to isolate the sand filters during pressuring up for perforating. When this safety valve is fitted it should be pressure tested in situ as part of the flowhead pressure testing procedure.
4.6 Depending on the rig up, it may not be possible to carry out steps 3.11 and 3.12 when pressure testing the surface equipment. These tests should then be carried out as part of the flow head pressure testing program.
BP EXPLORATION (XEU) WELL TESTING PROCEDURES MANUAL
SECTION 2110
SUBJECT PRESSURE TESTING SURFACE EQUIPMENT
REVISION 0
DATE 01/10/92
4.7 It is possible to pressure test both burner heads simultaneously, remove the burner plugs and pressure test both diverter valves simultaneously. However if both diverter valves are tested simultaneously it is not possible to identify the which diverter valve is leaking. If a diverter valve and burner head are pressure tested simultaneously, it is possible to visually check all lines and the burner head for leaks. If the source of the leak can not be found, then the leak must be at the oil diverter valve. (Note the gas by-pass valve can be closed to eliminate the gas diverter valves as the source of the leak)
4.8 Choke changes require isolation from both the upstream and down stream flow.
Therefore pressure testing of the choke manifold must include a pressure test on the Choke manifold back valves from the down stream side.
4.9 If there is a non-return valve in the kill line, ensure that trapped pressure is bled off on both sides after completing individual pressure tests.
BP EXPLORATION (XEU) WELL TESTING PROCEDURES MANUAL
SECTION 2120
SUBJECT SUBSEA TEST TREE DISCONNECT
REVISION 0
DATE 01/10/92