elastomer composites development for drillingschlumberger cambridge research platforms 4.0 julien...
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Schlumberger Cambridge Research
Platforms 4.0
Julien Ramier, John Staniland, Seth Hartshorne
RIEG - London – 13th of December 2019
Development of Elastomer Composites for Drilling – Degradation characterization
Schlumberger Cambridge Research
Applications of Elastomer Composites: Dynamic & Static Seals
2
Schlumberger Cambridge Research
Failure – End of life
Aging and Degradation
Performance
Formulation & Processing
3
Time - Life
▪ Surface modification: minimizing interactions with fluid and friction reduction
▪ Filler: o Correlation between morphology (structure and
size) and physical, processing & mechanical properties
o Dual filler systems: CB & surface modified silica or CNT
▪ NBR/HNBR & crosslinker to delay the degradation
Development of Elastomer Composites
Schlumberger Cambridge Research
Failure – End of life
Aging and Degradation
Performance
Formulation & Processing
4
Time - Life
▪ High Pressure testing platform o Mechanical properties of materials
o Friction and sealing (QMUL / CAMERON)
project (Eduardo’s PhD) “Behaviour of
elastomers against an oilfield casing”
▪ Chemical, physical and mechanical characterisation o Static and dynamic testing
o Friction under dry and wet conditions
Development of Elastomer Composites
Schlumberger Cambridge Research
Failure – End of life
Aging and Degradation
Performance
Formulation & Processing
5
▪ Moineau system representative test: Reciprocating Fatigue Deviceo Fatigue & abrasion
▪ Life prediction: Modelling PhD (Barnabas) – QMUL
▪ Rotating Control Device part – Life prediction / new design
Time - Life
Development of Elastomer Composites
Schlumberger Cambridge Research
Failure – End of life
Aging and Degradation
Performance
Formulation & Processing
6
▪ Prediction lifetime – degradation in fluid & To Physical relaxation and chemical degradation o Formulation additive selectiono Critical mud chemical components
▪ Monitoring health of seals (Subsea):o Elastomer behaviour (relaxation / tear), impact of ageing
Time - Life
Development of Elastomer Composites
Schlumberger Cambridge Research
Operational stressEnvironment
Failure Mechanisms in Dynamic Seals
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Aging and Degradation
Schlumberger Cambridge Research
Operational stressEnvironment
Failure Mechanisms in Dynamic Seals
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Degradation kinetics and life time prediction: How the mechanical
properties change with time
Development a testing device and analysis tool to:
Materials selection: Select & develop the best materials considering the conditions
- Formulation
- Additives
Aging and Degradation
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Aging and Degradation
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Aging and Degradation
Schlumberger Cambridge ResearchSlide 11
Physical relaxation
Chemical
degradation
▪ Chemical degradation: softening & hardening• Chain scission
• Leaching of plasticisers
• Crosslink scission or re-crosslinking
▪ Physical relaxation: Re-organisation of chain network –
desentanglement
• Function of T, fluid (swelling)
• Crosslinks and filler
Aging and Degradation
𝜎0−𝜎𝑡
𝜎0= 𝐴(𝑇) 𝑙𝑜𝑔10
𝑡
𝑡0+ 𝐵(𝑇)𝑓𝑐ℎ𝑒𝑚 𝑡 + 𝐶(𝑇)𝑓ℎ𝑎𝑟𝑑 𝑡
C. J. Derham, Plast., Rubber Compos. Process. Appl., 26(3), 129 (1997)
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Temperature Impact (NBR sulphur cured)Aging and Degradation
Arrhenius behaviour With Ea(physical) < Ea (softening) < Ea (hardening)
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Chemical Environment (NBR sulphur cured)
Slide 13
Aging and Degradation
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Mechnical
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Aging and Degradation Mechanical deformation (NBR sulphur cured)
Tensile Strain (%) Frequency (Hz)
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SUMMARY
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Degradation Kinetics
Life Prediction
Materials Development
Formulation Selection
▪ Realistic conditions: o Degradation in drilling conditions
o Prediction of the life taking into account the
environment and the operation stress
▪ Degradation prediction as materials selector
o Formulation comparison tool
o Commercial materials selector
o Additive qualifications
o Drilling fluid / materials combination optimisation
Accelerate development of materials
Predictive life of materials / partTARGETS:
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Questions ?
Thanks to
KTC/MCE: Lillian Guo and the team, Samba Ba
QMUL: Prof. J. Busfield, Barnabas Shawn, Eduardo Nunez