Degasser
#Rig_Inspection_Workshop
Mud system checklist :
• Is the ventilation adequate for the indoor mud-mixing systems?
• Is the lighting adequate around the mud pits and the shakers?
• Are the electrical cables and junction boxes suitable for Zone-1 and Zone-2 standards?
• Test the pressurised alarms of the airlocks between the mud pits and the mud pump room (MODUs).
• Check the housekeeping standards around the mud pits, the shakers and the sack storage area.
• Inspect the handrails and stairs for damage around the mud pits.
• Examine the condition of the dump valves of the mud pits for leaks.
• Test the condition of the mud agitators for noise and excessive vibration.
• Check the condition of the mud guns. Can the mud guns still be rotated 90 degrees?
• Test the condition and operation of the butterfly valves with fluid.
• Inspect the operation of the pit level indicators (i.e., both local and remote pit level indications).
• Ensure there are no damaged or unsecured gratings or other tripping hazards around the mud pits and shakers.
• Verify that the trip tank design is acceptable (i.e., the tank must be tall and narrow with at most one barrel per inch on the gauge).
• Test the condition of the desilter, desander and mud cleaners, if installed.
• Check the condition and operation of the vacuum degasser.
• Check the internal condition of the mud pits and record the corrosion levels.
• Check the distance of the mud suction line from the bottom of the mud pits. How much mud remains in the mud tank after suction is lost?
• Verify whether the mud pit total storage capacity is suitable for HP/HT applications.
• Ensure that all the AC motors in Zone 1 and Zone 2 are EX and certified (API RP 500 and API RP 505)
• Check that any fixed fire-fighting system is operational (fixed foam or CO2 installation).
• Check the personal protective equipment (PPE), i.e.:
o long-sleeved rubber gloves (to the armpits)
o rubber aprons
o goggles and/or face masks
o eyewash stations
o shower
o first-aid safety sheet of chemicals in use
o set of earplugs
• Check the corrosion levels of the mixing hopper funnels and piping.
• Check the operation of the hopper venturi arrangement and the operation of the eductors responsible for creating the suction pressure of the mud-mixing system.
• Check the condition of the surge tanks for cement and barite (MODUs).
• Verify that there is a mud-weighing system.
• Examine if adequate communication exists between the mud-mixing hoppers area and the driller's doghouse.
• Confirm that a first-aid treatment sheet (MSDS) is in use, detailing the particular types of chemicals being handled.
• Ensure that with 3,000-psi/200-bar WP or higher pressure-rated systems there are no NPT- threaded fittings on any connections (API Std 53 Section 6.2.2.2 “For working pressures of 3000psi (20.68 MPa) and greater flanged, welded and clamped (as well as OECs (other end connections)), that are in accordance with API 6A and API16A, shall be employed on components subjected to well pressure.”
• Check the general condition of the centrifugal pumps. Ensure they are secured properly and are vibration-free, and that coupling guards are fitted.
• Check if efficiency testing of the centrifugal pumps in the low-pressure mud system is performed on a regular basis.
• Ensure there are sufficient spare connections available for the sensors on the mud standpipe (MWD sensors).
• Check the certification of all the mud hoses in use (API RP 7L). Is there a spare mud hose available on the rig?
• Check the most recent wall-thickness measurements of the high-pressure piping (at least 87.5% of the original wall thickness must be left).
• Does the crew recalibrate the pressure gauges (to be tested every three years to 1% full scale as per API Std 53 Section 6.3.10.6)? (In some countries this is mandatory annually.)
• Ensure that all valve handles are fitted and that they are colour-coded.
• If connected to the choke manifold, there must be two isolation valves installed between the choke manifold and mud standpipe manifold. This must be verified. The pressure rating of both valves must be equal to the pressure rating of the choke manifold.
• Check the condition of the flanged pressure gauge located on the mud standpipe and on the mud pumps discharge manifold.
• Check that pressure tests are carried out periodically: i.e., a low-pressure test at 250 psi/17 bars and then to full working pressure.
• Check the condition of the Chiksans present on the rig site. No NPT-threaded Chiksans are allowed and all Chiksans require safety clamps and safety wires and chains. Check the service company policy, as some companies do not install safety wires.
Be careful with the type-602 and type-1502 hammer union couplings, if connected, since they do not hold pressure if clamped together, even if they appear to match.
19 авг 2024
