weatherford mpd webcast - offshore - proven accepted expected
DESCRIPTION
Webcast on offshore Managed Pressure Drilling (MPD) presented by Julmar Shaun Toralde, Weatherford Global Deepwater MPD ChampionTRANSCRIPT
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an adaptive drilling process used to more precisely control the annular pressure profile throughout the wellbore.
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(1) to ascertain the downhole pressure environment limits (2) to manage the annular hydraulic pressure profile accordingly
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KEY COMPONENTS
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diverts the annular flow of a well being drilled.
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An RCD serves as a barrier between the well and rig floor at various amounts of annular pressure.
The industry-approved standard for an RCD is API 16RCD.
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2015 Weatherford. All rights reserved. 13 Videos courtesy of Weatherford.
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Detection Control
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PRESSURIZED MUD-CAP DRILLING (PMCD) enables high ROP, less flat time and lower-cost drilling in extreme-loss situations.
CONSTANT BOTTOMHOLE PRESSURE (CBHP) reduces NPT and enables fewer and deeper casing strings when drilling windows are narrow or relatively unknown.
DUAL GRADIENT DRILLING (DGD) enables total well depth in the right hole size in deep well and deepwater drilling. Hydraulically speaking, DGD tricks the well into thinking the rig is closer.
RETURNS-FLOW-CONTROL (HSE) reduces risk to personnel and the environment from drilling fluids and well control incidents.
The goal of MPD is to control the pressure profile in a way that eliminates many of the drilling and wellbore stability issues that are inherent in conventional drilling methodologies.
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MPD Systems also provide advanced flow detection (AFD) and consequently, riser gas mitigation (RGM) advantages.
A rotating control device (RCD) creates a closed, pressurizable drilling system.
The RCD effectively redirects flow coming out of the well to automated MPD detection & control manifolds.
The MPD detection manifolds high-resolution mass flow meter increases sensitivity and reaction time to kicks, losses and other events.
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SOURCE:
PMCD is a variant of MPD that involves drilling without any returns to surface.
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An annulus fluid column, assisted by surface pressure exerted with a rotating control device (RCD), is maintained above a formation able to accept fluid/cuttings.
A sacrificial fluid with cuttings is accepted by the loss circulation zone.
Useful for cases of severe loss circulation that preclude the use of conventional drilling techniques.
SOURCE:
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Bo
tto
m H
ole
Pre
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Time
Fracture Pressure
Reservoir Pressure
Large Drilling Window
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Constant Bottomhole Pressure
Bo
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m H
ole
Pre
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Time
Fracture Pressure
Reservoir Pressure
CBHP enables navigation through narrow mud weight windows.
Narrow Mud Weight Window
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Subsea RCD for Dual Gradient A key component in one of the dual gradient drilling systems is the industry's first commercially available subsea rotating device (SRD), which diverts drilling fluids to establish a dual gradient environment.
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MPD: DP Drillship
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Rapidly and accurately applied and managed backpressure to determine the actual pressure profile of the wells
Allowed for immediate detection and control of kicks PMCD mode allowed the deepwater well to be drilled safely
to its targeted depth
Well was subsequently logged safely through the RCD system, despite total loss of circulation
Makassar Strait, Indonesia Water Depth ~6,000 ft
MPD is commonly used to manage geo-pressure environment uncertainties and associated risks in wildcat wells.
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Offshore Cameroon High pressure Depth of gas influx 10,463 ft (3,189 m) Influx size 3.2 bbl, 24% maximum gas reading Hole Size 8 1/2 in.
MPD is commonly used to manage geo-pressure environment uncertainties and associated risks in wildcat wells.
Navigated and drilled through a tight pressure window
Mitigated potential gas influxes caused by the changing pressure regimes and reduced nonproductive time (NPT) through early kick and loss detection
Enhanced overall operational safety by gaining control of bottomhole events
Enabled circulation of the influx out of the system at drilling
flow rate (used only 1 hour of rig time) while balancing the well, which saved time compared to slower, conventional methods
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Southwest Gulf of Mexico Formations Medium Cretaceous, Lower Tertiary
Using the CBHP variant of MPD, drilled the well with no loss of circulation in a shorter time frame than initially allotted
Drilling time was reduced from 30 days to 5 days (83 percent) and mud savings exceeded US $1 million
Applied MPD engineering, including continuous hydraulic stimulation, and increased drilling efficiency by mitigating drilling hazards
MPD enables drilling of successful wells in areas that have challenged conventional drilling methods.
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Offshore Kalimantan, Indonesia Bottomhole Pressure 12,000 psi Temperature 175 degrees C
Drilled an offshore exploration well with HP/HT and narrow mud weight window characteristics to the deepest depth possible
MPD was used to apply annular back pressure while drilling,
making connections and tripping
Allowed dynamic testing of fracture pressures and rapid changes of bottomhole pressures to simulate higher mud weights and detect changes in background gas levels
MPD enabled safe circulation of gas-cut mud and dynamic LCM squeezes in zones where fluid losses occurred
MPD enables drilling of successful wells in areas that have challenged conventional drilling methods.
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Offshore Peninsular Malaysia
MPD enables development drilling that is production-friendly and equipped to handle numerous contingencies.
Using CBHP-MPD, safely drilled two subsea development wells using a statically and underbalanced drilling fluid and maintained well control integrity
Automated MPD system was used to drill with fluid densities of 12.7 ppg to a target depth of 1,869 m (6,132 feet) and provided early kick and loss detection
Narrow drilling mud weight window was managed properly by utilizing CBHP-MPD during drill string connections
Reduced NPT spent weighing mud by instead adjusting backpressure and verifying the geo-pressure environment
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Offshore Oman Well Type Deviated Formations Illam, Laffan, Mishrif, Khatiyah, and Maddud limestones
MPD enables development drilling that is production-friendly and equipped to handle numerous contingencies.
Reached TD in three wells by mitigating conventional drilling NPT issues such as lost circulation, differential sticking, and well-control incidents
MPD technology enabled the use of lighter mud weights,
which reduced the requirements for fluid loss control
MPD system determined precise formation pressure limits through dynamic pore-pressure tests and formation integrity tests
Reduced NPT through early kick and loss detection and increased ROP
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MPD allows safe and efficient re-entry of abandoned wells with well integrity issues.
Safely re-entered and properly abandoned an offshore development well in shallow water to address leaks from previous isolation methods deployed
MPD helped cap the well and immediately detected an influx of gas during re-entry operations once the isolation plugs were drilled out
Enhanced surface flow monitoring allowed for proper risk mitigation and ensured that immediate action could be taken to secure the well, if and when required
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Pre-Salt
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Use of MPD to address severe circulation losses provides multiple efficiency and safety benefits over conventional methods.
PMCD has been used successfully on all types of offshore rigs to continue drilling offshore wells in total-loss zones that would otherwise have been extremely difficult to drill through
RCDs are used by offshore drilling-enabled operating companies to increase the safety of future drilling operations, especially when total circulation losses occur
MPD technology effectively reduces nonproductive time when drilling offshore
In PMCD mode, the ability to pump seawater down the drill string as a substitute for drilling fluid helps reduce mud costs. Cuttings go to large fractures in the formation
Offshore Asia Pacific Region Locations (Malaysia, Indonesia, Vietnam, Philippines, Thailand, etc.) Well Type Various Formations Fractured limestone and Carbonate / basement
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Use of MPD to address severe circulation losses provides multiple efficiency and safety benefits over conventional methods.
When lost circulation (720 bbl/hr) was encountered, the MPD pressurized mud-cap technique was initiated, allowing drilling to continue to TD
Minimized downtime resulting from lost circulation; no rig time was wasted mixing and spotting lost-circulation material
No H2S was brought to the surface during drilling
The average section rate of penetration increased five times over that of the previous well in the block
Offshore Angola Well Type Oil producer with gas cap, 1 to 2% H2S Formations Middle Pinda, highly fractured formation 2015 Weatherford. All rights reserved.
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Use of MPD to address severe circulation losses provides multiple efficiency and safety benefits over conventional methods.
Minimized NPT from losses and kicks by managing annular pressure during drilling to ascertain operational limits and stay within the pressure window
MPD enabled the operator to switch from CBHP to PMCD mode if fluid losses into the formation became unsustainable
Reduced NPT related to downhole problems to one day (compared to an average of ten days for each of the three previously-drilled wells in the field)
Fluid losses were minimized to 290 bbl of synthetic oil-based mud, compared to previous losses of up to 4,000 bbl
Offshore India Well Type Vertical high-pressure, high-temperature well Formations Fractured limestone and carbonate late Oligocene Depth 7,113 to 14,193 ft (2,168 to 4,326 m) Hole Size 8-1/2 and 12-1/4 in. 2015 Weatherford. All rights reserved.
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Use of MPD for navigating narrow mud weight windows and early kick detection enables drilling of HPHT wells in clastic reservoirs.
Safely drilled an 8 1/2-in. section to TD within a narrow 0.4-lb/gal (0.05 kg/L) drilling window under extreme pressure and temperature conditions
Maintained an overbalanced wellbore and controlled ballooning / breathing events by evaluating pore pressure and detecting kicks
MPD saved an estimated 10 rig days valued at $7.5 million, while reducing risk and enhancing safety
Controlling gas influxes and precisely weighting up the mud system saved time compared to a conventional system
Offshore Norway Well Type Offshore, exploratory, HPHT Production Hole Size 8-1/2 in. (216 mm) Total Depth 19,465 ft (5,933 m)
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Use of MPD addresses uncertainties and risks associated with pre-salt formations.
Re-entered a plugged, cemented, and abandoned well in 6,562 ft (2,000 m) of water in the deepwater pre-salt area of Brazil
Previous drilling was terminated when the operator encountered a severe fluid loss zone that consumed 600 bbl/hr (95 m3/hr) that led to plugging and abandonment
MPD was used until total losses experienced. At 16,552 ft (5,045 m), the team switched to PMCD mode
Reached the targeted production zone in PMCD mode at an estimated depth of 16,781 ft (5,115 m) and enabled well completion
Brazil, Santos Basin Well Type Deepwater, vertical Reason For Abandonment Massive fluid losses while drilling
2015 Weatherford. All rights reserved.
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2015 Weatherford. All rights reserved. 2015 Weatherford. All rights reserved.
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2015 Weatherford. All rights reserved. 2015 Weatherford. All rights reserved.
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2015 Weatherford. All rights reserved. 2015 Weatherford. All rights reserved.