1. Stator Elastomers Application vs Innovation
IADD Luncheon June 22, 2017

2. Chocolate chip cookie? Which one is better?
same label, different recipe, different outcome

3. Stator elastomer compounds
Stator Introduction
Stator elastomer compounds
Isn’t rubber rubber? It’s black and looks the same.
What characteristics define a good rubber?
Who or what defines what “good” rubber is?
“I just want a hard rubber”. (Why??)

4. Power Section Variables
well plan & objectives
depth (hyd.psi)
path (inc & azm)
Bit type
formation
reactive torque
Drilling Fluids
WBM vs OBM
chemicals
additives
Rig Capabilities
pump / psi limits
top drive/kelly
People & Resources
experience
knowledge
Multiple sub-industries
Bits
Fluids
Rig Contractors
Lower End Manuf.
Symbiotic relationship
not necessarily beneficial
affected by all

5. Power Section Provider
Overall Expectations
Customer Expectations
minimize trips due to failure
complete drilling objectives in desired timeframe
drill faster (improve ROP)
last longer (historically aggressive environments)
$/ft
ROP
Operator
Directional Company
Motor Company
Power Section Provider

6. Elastomers (Rubber) is an engineered system comprised of
Elastomer System
Elastomers (Rubber) is an engineered system comprised of
Base Polymer (defines characteristics)
cure system
vulcanizes the rubber to cross-link the sulfur with the polymer chemical chains
fillers and reinforcing agents
many varieties and structures
help the vulcanization process
help define the mechanical properties (ie. tensile, tear, modulus)
Plasticizers and Softeners
aids in the blending of the polymer and the other additives
aids in processing characteristics
other aids, agents, accelerators
NBR Polymer
HNBR Polymer

7. Elastomer Polymers NBR – Acrylonitrile-Butadiene Rubber
EPDM – Terpolymer of Ethylene Propylene & Diene
CR – Neoprene (polychloroprene)
VMQ – Silicone Rubber
CO/ECO – Epichlorohydrin (usually just ECO)
NBR – Acrylonitrile-Butadiene Rubber
HNBR – Hydrogenated Acrylonitrile-Butadiene Rubber
FVMQ – Fluorosilicone Rubber
FKM – Fluoroelastomer

8. Rubber properties tend to have inverse effects:
Elastomer Properties
Rubber properties tend to have inverse effects:
increase in one equates to decrease in other
what is the right balance of properties to performance?
Nitrile Rubber (NBR)
Air/gas permeability
Low temperature flexibility
Cure rate – peroxide system
Resilience
Decreases
Heat – aging resistance
Abrasion resistance
Tensile
Stiffness
Thermoplasticity
Compatibility with polar polymers
Oil/fuel resistance
Cure rate – Sulfur Cure System
Processability
Density
Increases
As ACN Increases

9. Longer life in temps > 300°F
Application
More Power
HP is a function of RPM and Torque
RPM is geometry (&fit) dependent so must come from Torque
Increased torque solved in two ways:
increase the # of stages (longer)
increase the pressure per stage (stronger)
RPM implications
Longer life in temps > 300°F
Life is a function of heat buildup and polymers
Heat managed by geometry design & fit (hysteresis vs BHT)
Polymers limited in capabilities

10. Innovation vs Application
what problem are we solving?
is there a problem or is it perceived?
is there a rubber polymer to address issue?
what properties of the rubber need addressing?
can it be molded and glued into the stator tube?
standard / typical process limitations?
new technology or materials costs $ to develop
how expensive is it?
will the customer pay for it?
how can the value proposition be measured?
better ROP?
longer service life in a specific application?
reduced failure trips?

11. Stator elastomers are:
Conclusion
Stator elastomers are:
one component of a larger assembly designed for drilling
exposed to numerous downhole environments
subjected to a variety of high dynamic loads and stresses
designed and engineered for purpose
complex multi-ingredient systems
limited in scope (is there a one-size-fits-all solution?)