Layup of Land Based Drilling Rigs

MAy 12, 2020

During downturns in the oil and gas industry, landbased oil rigs are some of the first production facilities
to be closed. During these periods of extended shutdown, the rig requires corrosion protection of the
assets. The objective of this document is to provide recommendations for multi-year corrosion protection
using environmentally responsible vapor phase and migrating corrosion inhibitors. With proper selection,
many of these do not require removal prior to startup, simplifying preservation and minimizing or
eliminating potential EPA disposal issues/concerns.

ACRONYMS

PAG Polyalkylene Glycol
PAO Polyalphaolefin
NOV ST80 (Roughneck) (National Oilwell Varco) Electric/hydraulic machine for making up drill pipe joints (screwing together)
 DW Draw Works (Heavy Lifter)
HPU Hydraulic Power Unit
E-BRAKE Electrically Powered Brake
VFD Variable Frequency Drive
BOP Blowout Preventer
MCC Motor Control Center
HMI Human Machine Interface
PLC Programmable Logic Controller

DRILLING RIG EQUIPMENT
Diesel Engines
Lubrication system
• Add M-531 at 5% by volume to engine oil
• Run engine for a minimum of 1 hour after M-531 is applied

• If engine is already rigged down, use available ports to fog M-531 at 1 oz./ft3 (1 L/m³)

Cooling system
• Add M-640 L to cooling system at 2.5% by volume. Run engine for a minimum of 1 hour after M-640 L is applied
• If engine is already rigged down, use available ports to fog VpCI® -337 W at 1 oz./ft3 (1 L/m³)
• If currently running SPX 50/50 coolant, do not treat. Treating with this coolant will void the warranty

Fuel system
• Add VpCI®-707 at 0.2% by volume to fuel tanks
• Run engine for a minimum of 30 minutes
• If system has been drained, fog VpCI®-707 into
fuel tank, lines, and air intake to diesel engine

Mud Pumps
• If still rigged up, fill slug tank with fresh water containing 1% by volume VpCI®-649 liquid
• Circulate through entire mud system; this method would require each mud line and component be capped once they are rigged down
• If the rig is already stacked, fog each individual component with VpCI®-337 at 1 oz./ft3 (1 L/m³) andcap
• Mud pumps have two “sides”: the gear end and fluid end
• The gear end houses the crankshaft and is filled with a type of gear oil that will tend to requireM-528
• Add M-528 at 5% to oil and operate for a minimum of 30 minutes
• If rigged down and empty, fog with M-528 at1 oz./ft3 (1 L/m³)
• The fluid end can be protected by flushing with treated fresh water, containing 1% VpCI®-649, from the slug tank if in operation
• If rigged down
• Fog with VpCI®-337 at 1 oz.ft3 (1 L/m³)
• Grease caps with CorrLube™ VpCI® Lithium EP Grease

Boiler
• With boiler shut down and cold:
• Remove any external rust with VpCI®-423
• Remove VpCI®-423 residual and neutralize with a 10% solution of VpCI®-414
• Place Boiler Lizard® in waterside of boiler (one pouch per 1000 gallons of water [3.8 m³])
• Fog fireside with VpCI®-337 W
• Control panels
• Deenergize
• Spray internal surfaces with ElectriCorr® VpCI®- 239
• Place appropriate size emitter in panel
• VpCI®-105 – 5 ft3 (0.14 m³)
• VpCI®-111 – 11 ft3 (0.31 m³)
• Valves
• Spray all stems, bonnet bushings, packing body nuts, and bonnet nuts with CorShield® VpCI®-369
• Piping (uninsulated)
• Remove any external rust with VpCI®-423
• Remove VpCI®-423 residual and neutralize with a 10% solution of VpCI®-414
• Spray with VpCI®-391
• Piping (insulated)
• Inject VpCI®-658 under insulation

Top Drive
This is a complex system. These top drives have multiple lubricating systems, a multitude of grease points, and piping for the mud system.
• Mud lines
• If operational, the mud lines will be treated with fresh water and 1% VpCI®-649
• Oil system
• If operational, add one of the below additives, depending on lubricant type, at 5% by volume
• M-528 – PAG
• M-529 – PAO
• M-530 – Mineral
• M-531 – PAO
• If nonoperational, fog with one of the below additives, depending on lubricant type, at 1 oz./ft3 (1 L/m³)
• M-528 – PAG
• M-529 – PAO
• M-530 – Mineral
• M-531 – PAO
• Grease points
• Purge with CorrLube™ VpCI® Lithium EP Grease
NOV ST80
Each head houses its own lubricating system for the rotating portions and is driven by hydraulic pressure. Can be treated while operating or rigged down.
• If operational, add one of the below additives, depending on lubricant type, at 5% by volume
• M-528 – PAG
• M-529 – PAO
• M-530 – Mineral
• M-531 – PAO
• If nonoperational, fog with one of the below additives, depending on lubricant type, at 1 oz./ ft3 (1 L/m³)
• M-528 – PAG
• M-529 – PAO
• M-530 – Mineral
• M-531 – PAO
Draw Works
The draw works is the heavy lifter. This is a large drum that houses the drill line and moves the top drive alongwith the drill string.
• Drill line should be treated with VpCI®-369 andcovered with VpCI®-126 HP UV Shrink Film
• Lubrication system
• If operational, add one of the below additives, depending on lubricant type, at 5% by volume
• M-528 – PAG
• M-529 – PAO
• M-530 – Mineral
• M-531 – PAO
• If nonoperational, fog with one of the below additives, depending on lubricant type, at 1 oz./ft3 (1 L/m³)
• M-528 – PAG

• M-529 – PAO
• M-530 – Mineral
• M-531 – PAO
• Electronic control system
• Spray all internal cabinet surfaces with ElectriCorr® VpCI®-239
• Install appropriate size emitter
• VpCI®-101 – 5 ft3 (0.14 m³)
• VpCI®-111 – 11 ft3 (0.31 m³)
HPUs
Several types and sizes (e.g., DW brake, rig system, brake calipers)
• If operational, add one of the below additives, depending on lubricant type, at 5% by volume
• M-528 – PAG
• M-529 – PAO
• M-530 – Mineral
• M-531 – PAO
• If nonoperational, fog with one of the below additives, depending on lubricant type, at 1
oz./ft3 (1 L/m³)
• M-528 – PAG
• M-529 – PAO
• M-530 – Mineral
• M-531 – PAO
• Calipers can be coated with VpCI®-391 prior to activation of the E-Brake Catwalk Hydraulic Operated
• If operational, add one of the below additives, depending on lubricant type, at 5% by volume
• M-528 – PAG
• M-529 – PAO
• M-530 – Mineral
• M-531 – PAO
• If rigged down, most have no spill connections so the oil will stay internal
• The connections will need to be sprayed with VpCI®-369 and covered AC Traction Motors (5hp to 2000hp)
• Fog internals with ElectriCorr® VpCI®-239
• Add VpCI®-101 Emitter to junction box

• Coat externals with VpCI®-391 and cover with VpCI®-126 HP UV Shrink Film
VFD
Electrical house, drillers cabin, computers, touch screen HMIs, battery packs, PLCs, AC drives, rectifiers, transformers, air conditioners, etc.
• Spray cabinet internals with ElectriCorr® VpCI®-239
• Install appropriate size emitter
• VpCI®-105 – 5 ft3 (0.14 m³)
• VpCI®-111 – 11 ft3 (0.31 m³)
• VpCI®-308 Pouch – 35 ft3 (1 m³)
• Each of these should be in a vessel that can be at least partially sealed
Mud Pits
(tanks open top) hold oil and water-based drilling fluids, agitators, shakers
• Agitators will receive additive in the lubrication reservoirs
• Wash tank walls with 10% solution of VpCI®-414
• Coat with VpCI®-391
Diesel Fuel Tanks
• Should be emptied and will need to be fogged with VpCI®-707 at 1 oz./ft3 (1 L/m³)
Water Tanks
• Should be emptied and will need to be fogged with VpCI®-337 at 1 oz./ft3 (1 L/m³)
Accumulators Hydraulic Operated
• Gauges and valves: spray with CorShield® VpCI®- 369
• Fog accumulators with one of the below, depending on lubricant type, at 1 oz./ft3 (1 L/m³)
• M-528 – PAG
• M-529 – PAO
• M-530 – Mineral
• M-531 – PAO
• Gauges should be covered with VpCI®-126 HP UV Shrink Film to prevent UV damage
BOPs Hydraulic Operated
• VpCI®-369 on all surfaces and completely wrap the

BOP segments with MilCorr® VpCI® Shrink Film
VFD and MCC Houses
• Spray cabinet internals with ElectriCorr® VpCI®-239
• Install appropriate size emitter
• VpCI®-105 – 5 ft3 (0.14 m³)
• VpCI®-111 – 11 ft3 (0.31 m³)
• VpCI®-308 – 35 ft3 (1 m³)
Rig Houses for the Employees
• Recommendations will depend on size and level of preservation required
Rotary Tables
• Purge with CorrLube™ VpCI® Lithium EP Grease. Internals will receive treated hydraulic fluid if still rigged up and operational
Choke Manifold and Gas Buster
• If in operation this will be covered with the fresh water treated with VpCI®-649 at 1% by volume
• If rigged down, we will need to fog and cap with VpCI®-337 at 1 oz./ft3 (1 L/m³)
Air Compressors
• Bleed down and treat the lubricating reservoirs depending on lubricant type, at 1 oz./ft3 (1 L/m³)
• M-528 – PAG
• M-529 – PAO
• M-530 – Mineral
• M-531 – PAO
• Treat electrical panels with VpCI®-111 Emitters and cover with VpCI®-126 HP UV Shrink Film
BOP Lifting Winches, Pneumatic and Hydraulic
• Pneumatic will require VpCI®-369 on moving components. Coat exterior with VpCI®-391 and cover with VpCI®-126 HP UV Shrink Film
• Hydraulic will receive treated fluid if still operational
• These winches do not hold fluid; they are run off air or hydraulic pressure

Drill Pipe
• Fog with VpCI®-337 at 1 oz./ft3 (1 L/m³) and cap.
Pipe dope should have already been applied to threads. If not, we can apply CorrLube™ VpCI® Lithium EP Grease or VpCI®-369 before replacing
thread protectors
Choke Hoses, and Vibrating Hoses 10k rated
• Fog with VpCI®-337 at 1 oz./ft3 (1 L/m³) and cap

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