Drill Cuttings Issues in Decommissioning Derek Moore, Formerly Marine Scotland
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Drill Cuttings Issues in Decommissioning
Derek Moore, Formerly Marine Scotland
Drill Cuttings Issues in Decommissioning
September 2014
Derek Moore
3
• Brief History
• Environmental impacts
• Decommissioning
• Post Decommissioning
Drilling muds
4
DRILLING MUDS
• Cool and lubricate drill
bit
• Transport cuttings out
of well
• Stabilise well walls
• Provide hydrostatic
head
Pile Morphology
5
Clyde Brent South
Brent Alpha
Beryl Alpha Miller
Water based vs Oil based?
6
“…we only use water based
muds in the North Sea…
… however we do routinely add
10-15% diesel to improve its
performance !”
Replacement mud types
7
Alternatives to diesel based
muds
POBM Pseudo Oil
Based Mud
SOBM Synthetic Oil
Based Mud
LTOBM Low Toxicity
Based Mud
OSPAR 2000/3
8
9
Oil Based Mud
Water Based Drilling Fluid
Additives
Brines e.g. Calcium Chloride
Dihydrate
Sodium Hydroxide
Sodium Carbonate
Potassium Chloride
Potassium Aluminium
Silicate
Silica
Disodium Duhydrogen
Diphosphate
Sucrose
Sodium Bicarbonate
Citric Acid Monohydrate
Weighting Chemical Barite
Calcium Carbonate
Silica
Acidity Control Chemical Calcium Hydroxide
Viscosifier
Quaternary Ammonium
Compounds
Glyoxal
Xanthan Gum
Lost Circulation Material Nut Shells
Synthetic Fibres
Synthetic Flakes
Walnut Shells
Wood Fibres
Graphite
Carbon
Calcinated Petroleum Coke
Cellulose
Kaolin
Polyalkalene Glycol
Polyvinyl Alcohol
Sodium Sulphate
Wollastonite
Fluid Loss Control Chemical Cellulose Fibre
Gilsonite
Methylstyrene/Acrylate
Copolymer
Synthetic Amorphous Silica
Mica
Nut Shells
Wood Fibres
Emulsifier
Dipropylene Glycol Monomethyl
Ether
Petroleum Distillate
Fatty Acids
Modified Amidoamine from FA
OPF Base Oil Hydrocarbons
Petroleum Distillate
OPF Additive
Dipropylene Glycol Monomethyl
Ether
Petroleum Distillate
Modified Amidoamine from FA
Shale Inhibitor/Encapsulator Lignite
Sodium Asphalt Sulphonate
Pipe Release Chemical Citric Acid Monohydrate
Disodium Dihydrogen
Diphosphate
Potassium Chloride
Ethylene Glycol Monobutyl
Ether
Biocide Triethanol
EDTA (ethylene-dinitrilo)
tetraacetic acid
Hydrogen Sulphide Scavenger Iron (III) Oxide
Silicon Dioxide Crystalised
Triethanol
Detergent / Cleaning Fluid D-glucopyranose
Tetrapotassium Pyrophosphate
Benthic impacts
10
OSPAR Recommendation 2006/5
11
Post Decommissioning
12
Plan and relief of the Murchison drill
cuttings pile
Fishing operations
13
14
Post Decommissioning
Fishing Gear Disturbance
15
Fishing Gear Disturbance
16
Conclusions
17
• Acceptable case can be made
for leaving piles to degrade
naturally
• Little impact from fishing
operations
• Must recognise that fishing
gear has the potential to
become contaminated and
influence the marketing chain
• Use of technological advances
such as FishSAFE and web
based information systems
such as the Kingfisher
Fortnightly Bulletin.
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