st drilling fluids for geologists · aig‐adia drilling for geology seminar 1/08/2014 1 1st august...
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AIG‐ADIA Drilling for Geology seminar 1/08/2014
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Drilling Fluids for Geologists1st August 2014
Definition of a Drilling Fluid
A Drilling fluid is any medium circulated down holewhile drilling to remove cuttings;
• Air
• Air with water, foam or polymers
• Water, oil or synthetic based fluid
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AIG‐ADIA Drilling for Geology seminar 1/08/2014
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What drillers expect
• Hole stability
• Ability to remove cuttings
• Increased productivity
What Geologists expect
• Sample integrity
• Hole stability
• Environmental impact
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AIG‐ADIA Drilling for Geology seminar 1/08/2014
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PreventativeDrilling fluids are not a cure
3 important processes;
– Filtration control
– Encapsulation
– Inhibition
Filtration Control
• The process of;
– controlling the amount of filtrate being squeezed into the formation from pump; and
– hydrostatic pressures via a filter or wall cake
Filter cake ‐
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Filtration Control
Filtration Control
Bentonite‐based muds and drill solids provide the building blocks for the filter cake;
– AUS BEN
– AUS BEN XTRA
– AUS GEL
– AUS GEL XTRA
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AIG‐ADIA Drilling for Geology seminar 1/08/2014
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Filtration Control
Polymers tighten the filter cake by either;• De‐flocculating the drill solids; or • Plugging existing pores to reduce permeability
– PAC R (High Viscosity Polyanionic Cellulose)– PAC L (Low Viscosity Polyanionic Cellulose)– AUS DEX (Starch)– FILTREX– RESIDRILL
Filtration Control
Lower filtration loss the tighter the filter cake.
Tighter the filter cake the greater the hole stability
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EncapsulationFormation of a coating or protective film around the drill cuttings, core and side walls of the hole
Blocks chemical exchange and hydration
Encapsulation• Controls dispersion and fretting formations
• Increases matrix retention
• Increase integrity of sample
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Encapsulation
PHPA, or
Partially HyrolyzedPoly Acrylamide
– COREWELL
– CLAY DOCTOR
– AMC CR 650
Inhibition
Controls swelling formations through cationic exchange
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Inhibition
• Common inhibitors
– Potassium Chloride
– Potassium Acetate
– Potassium Formate
– Shalehib Ultra
Solids Removal Unit (SRU)
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SRU – Sumpless Technology
Traditional drilling fluid sumps No sumps – closed loop system
• Reduce environmental footprint
• Reduce water consumption
• Reduced product usage
Recycling Units ‐ AMC 500‐R
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Recycling Units – 1500R
SRU ‐ Centrifuge
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Underground SRU
HP‐SRU
Flinders Ranges, South Australia
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SRU – Proven Benefits
SRU – Proven Benefits
Water consumption reduced by using the SRU
Results from UG‐SRU Field Trial, Goldfields, Western Australia
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SRU – Proven Benefits
Mud consumption reduced by using the SRU
Results from UG‐ SRU Field Trial, Goldfields, Western Australia
SRU – Proven Benefits
Financial benefit of using the SRU
Results from SRU Field Trial, Chile
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AMC’s Services
• Experienced fluid technicians available for on‐site support and advice
• Customised training programs – Mud Schools
• Environmental Bulletins/Safety data sheets on all products
• Fully equipped lab in Australia
• Quality products manufactured and quality controlled in house
• Research and development team developing new products
• Environmental focused products