elastomer composites development for drillingschlumberger cambridge research platforms 4.0 julien...

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


Applications of Elastomer Composites: Dynamic & Static Seals

2


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

http://www.slb.com/services/miswaco.aspx




Performance


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






Performance


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






Performance


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




Operational stressEnvironment

Failure Mechanisms in Dynamic Seals

7



Operational stressEnvironment

Failure Mechanisms in Dynamic Seals

8

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


Schlumberger Cambridge Research9


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


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)


12

Temperature Impact (NBR sulphur cured)Aging and Degradation

Arrhenius behaviour With Ea(physical) < Ea (softening) < Ea (hardening)


Chemical Environment (NBR sulphur cured)

Slide 13



Mechnical

14

Aging and Degradation Mechanical deformation (NBR sulphur cured)

Tensile Strain (%) Frequency (Hz)


SUMMARY

15

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:


Questions ?

Thanks to

KTC/MCE: Lillian Guo and the team, Samba Ba

QMUL: Prof. J. Busfield, Barnabas Shawn, Eduardo Nunez

elastomer composites development for drillingschlumberger cambridge research platforms 4.0 julien...

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