Pressurized Mud Cap drilling is one of the four variations of managed pressure drilling and also the latest and the quick drilling techniques used today.
2. Outline
• Objectives of PMCD
• Introduction – Need for PMCD
• Conventional Drilling
• Pressurized Mud Cap Drilling(PMCD)
• Constant Bottom Hole Pressure
• Advantages and Disadvantages of PMCD
• PMCD Adoption
• Success Stories of PMCD
• Conclusion
• References AUTOMATED MPD : Photo courtesy of Weatherford
= • PMCD• AYUSH MISHRA
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3. Pressurized Mud Cap Drilling (PMCD) is one of the four variations of Managed Pressure
Drilling (MPD), that involves drilling with no returns to the surface
Objectivesof PMCD
The objectives of PMCD are :
To ascertain the downhole
pressure environment limits
To manage the annular hydraulic
pressure profile accordingly
• PMCD• AYUSH MISHRA
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5. Need for PMCD
• As per drill forum Conventional Drilling hasn’t changed much in past years –it’s still an “Open to
Atmosphere” system
• Easy drilling is behind us – drilling problems are increasing – and getting complex
• Independent studies reveal that 25–33% of new wells can’t be drilled conventionally
• MPD is a safer drilling method and more economical
• We need a better way to drill !
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• PMCD• AYUSH MISHRA
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6. ConventionalDrilling
Drilling fluid is pumped down the drill string and
returns to the surface via the annulus
The annulus hydrostatic column is weighted to exceed
the reservoir pressure and prevent kick
Various losses occur such as mud loss and circulation
loss
Source: Neal Adams • PMCD• AYUSH MISHRA
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7. Pressurized Mud Cap Drilling
• Drill string injection is switched to sacrificial fluid after closing
annulus at surface by Rotating Control Unit (RCD)
• No returns to the surface
• Disposable drilling fluid (normally water) is pumped down the drill
string
• Sacrificial fluid and cuttings are lost to the formation
• Useful for cases of severe loss circulation that preclude use of
conventional drilling techniques
Photo courtesy of Weatherford
7 Slide 7
8. Fracture Pressure
Constant Bottom hole Pressure
Constant Bottom Hole Pressure
BottomHolePressure
SBP SBP SBP
Time
• Surface backpressure (SBP) is added via the MPD choke
when the mud pumps are turned off to keep bottom hole
pressure constant
• Constant Bottom hole Pressure (CBHP) is a variant
of MPD used in PMCD
Photo courtesy of Weatherford
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Reservoir Pressure
• PMCD• AYUSH MISHRA
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9. PMCD: Advantages and Disadvantages
ADVANTAGES
• Permits safe and efficient drilling
through severe or total loss zones –
highly cost effective compared to
conventional drilling in terms of mud
loss
• Well can be drilled to TD with
virtually no loss of rig time
• Limits damage to the reservoir and
cement
• Very good technique for H2S
environment because the gas is
pushed back into formation –no gas
returns to the surface
• Disposal expenses are eliminated
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• PMCD• AYUSH MISHRA
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10. PMCD: Advantages and Disadvantages
ADVANTAGES DISADVANTAGES
• Permits safe and efficient drilling
through severe or total loss zones –
highly cost effective compared to
conventional drilling in terms of mud
loss
• Well can be drilled to TD with
virtually no loss of rig time
• Limits damage to the reservoir and
cement
• Very good technique for H2S
environment because the gas is
pushed back into formation –no gas
returns to the surface
• Disposal expenses are eliminated
• There are no returns to surface –
Geologists don’t prefer this technique
as no sample is obtained
• PMCD uses large volumes of fluid –a
week of drilling could require 120 –
150,000 bbl of fluid including drill
pipe & annulus injection
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• PMCD• AYUSH MISHRA
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11. PMCD Adoption
IndustryacceptanceofPMCD
Country icons from Apple website, Base graphics courtesy of Weatherford. Data presented on deployments are from multiple trade publication articles and technical papers on Deepwater MPD.
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• PMCD• AYUSH MISHRA
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12. Success Stories of PMCD
• PMCD drastically reduced non productive
time in Soka Field at South Sumatera
• PMCD was a success in Indonesia
• PMCD in Angola increased the overall
efficiency
• PMCD in Qatar’s North field
Photo courtesy of Weatherford Photo courtesy of Weatherford
12 Slide 11
13. Future of MPD
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• PMCD• AYUSH MISHRA
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The U.S. offshore MPD services industry is estimated to witness the fastest growth over the next six
years to reach a net worth of USD 585 million by 2024
Significant development of offshore oil & gas wells in the Gulf of Mexico along with extremely
complicated formations in the region is anticipated to drive managed pressure drilling services demand
North America dominated the global demand accounting for 37.3% of total market revenue in 2015
Key market players include operating in the global managed pressure drilling services market include
Archer Well services, Baker Hughes, Halliburton, Weatherford International, Schlumberger Limited.
14. Conclusion
• Adoption of pressurized mud cap drilling (PMCD) technologies in deep-water environments and
floating rigs is gaining acceptance
• Integration of MPD technologies has produced improvements and solutions in terms of drill ability
and efficiency in terms of process safety
• The ability to continually monitor potential kick and loss events while optimizing drilling
performance has resulted in continued adoption of PMCD throughout the play.
• Many examples exist where PMCD delivered a well when conventional methods failed such as the
case in Indonesia
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• PMCD• AYUSH MISHRA
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15. References
Slide 15
Andi Eka Prasetia, and Steve Nas, SPE, Weatherford, Pressurized Mud Cap Drilling Drastically Reduces Non-Productive Time in
Soka Field, SPE, Medco E&P Indonesia - SPE/IADC 125311
Julmar Shaun S. Toralde and Keith Hillis , Weatherford, Running liners and Well Completion in Pressurized Mud Cap Drilling
Mode in Indonesia - SPE Paper 132117
www.drillsafeforum.org/08_pres/DrillSafe_Forum_Jun08_KEEP_DRILLING_Ken_Muir_Managed_Pressure_Drilling_Talk.pdf
ONGC Drilling Manual operations- P.S. Bais
Drilling Engineering by Neal Adams and Tommie Charrier, Research Associate
Oil Well Drilling Engineering-Hussain Rabia
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