Just sharing knowledge

1. Dynamic
Annular
Pressure
Control
@Balance

2. © 2006 At Balance Americas LLC All Rights Reserved
Dynamic Annular Pressure Control
Reduce effects of overbalance
TD in ERD wells
TD in depleted fields
Reservoir damage
Reservoir productivity
Hole breathing & well influx
Hole cleaning
Drill rate
Mud loss
Stuck pipe
Reduce effects of overbalance
TD in ERD wells
TD in depleted fields
Reservoir damage
Reservoir productivity
Hole breathing & well influx
Hole cleaning
Drill rate
Mud loss
Stuck pipe
Manage BHP at or near balance and overcome
limitations of drilling with overbalanced mud in:
Growing number of aging fields
Hostile pressure environments
Fields conventionally undrillable
Initial
Concept:

3. © 2006 At Balance Americas LLC All Rights Reserved
Engineered Pressure Window
0
Pressure
DepthCasing Point
BELOW MINIMUM
• Kicks
• Borehole Stability
• Swap Out
ABOVE MAXIMUM
• Mud Losses
• Ballooning
• Stuck Pipe
• Reduced ROP
• Formation Damage
• Poor Hole Cleaning

4. © 2006 At Balance Americas LLC All Rights Reserved
Pdynamic +Psurface
Conventional VS DAPC
Pressure
TVDepth
0
Conventional
Pdynamic (= Pmax)
Pstatic (= Pres)
DAPC
Pstatic
Static Surface Back Pressure
Pstatic + Psurface
Pressure
Window
Casing
Reduce With Pumps On
Pressure at Surface
with DAPC
Down hole with
conventional
Set point
pressure

5. © 2006 At Balance Americas LLC All Rights Reserved
DAPC Automated System
• Well Head Pressure
• Downhole PWD
• Flow Rate
• String RPM
• Drilling ROP
• Drilling WOB
• Well Geometry
• Drill String Geometry
• Well Head Pressure
• Downhole PWD
• Flow Rate
• String RPM
• Drilling ROP
• Drilling WOB
• Well Geometry
• Drill String Geometry
Back Pressure PumpBack Pressure PumpBack Pressure Pump Automated Dual ChokeAutomated Dual ChokeAutomated Dual Choke
Hydraulics ModelHydraulics ModelHydraulics Model
Remote MonitoringRemote MonitoringRemote Monitoring
Programmable ControllerProgrammable ControllerProgrammable Controller
Graphical User
Interface
Graphical UserGraphical User
InterfaceInterface
Data NetworkData NetworkData Network

6. © 2006 At Balance Americas LLC All Rights Reserved
Piping & Instrumentation Drawing

7. © 2006 At Balance Americas LLC All Rights Reserved
DAPC Automated Backpressure
The Only MPD Solution with
Standalone Automated Backpressure Pump
The Only MPD Solution with
Standalone Automated Backpressure Pump
Backpressure Pump
Modular / Stand-alone
Automatic start
Electric motor drive
Applies pressure when
rig pumps are off or
down
Backpressure Pump
Modular / Stand-alone
Automatic start
Electric motor drive
Applies pressure when
rig pumps are off or
down

8. © 2006 At Balance Americas LLC All Rights Reserved
DAPC – “PROVEN TECHNOLOGY”
• Hydraulics Model – developed by Shell
Proven technology that can operate in any
environment and maintain a BH pressure window
R&D started in 1998
• Backpressure Pump that maintains BHP
during any rig pump variations
• PROVEN - Fully automated control system
Allows automated response to changing Down
Hole conditions

9. © 2006 At Balance Americas LLC All Rights Reserved
Other Applications with DAPC
• Value of DAPC with Underbalanced Drilling
Hold backpressure with DAPC to:
– Reduce produced well fluids
– Reduce footprint (separator, tanks)
– Reduces manpower from UBD crew
Improved reservoir characterization
Enhanced Safety Controls
Stabilize Slugging
Bottom hole pressure [kPa]
BHP without control [kPa]
BHP pressure with control [kPa]
kPa
9000
8000
7000
6000
5000
4000
3000
Time [h]
43.532.521.510.50.2

10. © 2006 At Balance Americas LLC All Rights Reserved
Formation Damage
▼ Reduce Formation Damage
▲ Increase Productivity with less Formation Damage
Drilling Performance
▲ Improve Hole Cleaning
▲ Increase ROP
▼ Reduce Mud Costs
Risk Management
▼ Reduce Risk of losses, well control, Sidetracks, stuck pipe,
lost circulation – Reduction of NPT
▼ Reduce NPT from Green Drilling Crews
▼ Reduce Casing Strings
Value Drivers of TRUE BHP Control

11. © 2006 At Balance Americas LLC All Rights Reserved
QUESTIONS?