Formation Dynamics Tester MDT in the North Sea John Costaschuk Dann Halverson Andrew Robertson Res Eng Petrophysicist Geologist Content Defining the Value of ID: 560691
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Slide1
Cross discipline use of the Modular Formation Dynamics Tester (MDT) in the North Sea
John Costaschuk, Dann Halverson, Andrew Robertson
Res. Eng. Petrophysicist GeologistSlide2
ContentDefining the Value of Information and the Functionality of the Modular Formation Dynamics Tester (MDT)Examples of value creation within BP’s North Sea operations:
Summary and Conclusions
A. Operational Value
B. Subsurface Value
C. Project Value
InSitu
Fluid
Analysis(IFA)
IFA & Asphaltene EoSVertical Interference Test
Acquisition of live
microbial samplesSlide3
Defining the Value of InformationMany E&P decisions are difficult to make, involving significant capital expenditure for uncertain gain.
Value enhancement comes from allowing more robust decisions
to be made, as a result of more reliable forecasting of the uncertain parameters and outcomes.
OperationalSubsurfaceProject
Value of Information (VoI) compares the value associated with a decision, informed with and without extra information.
The reliability of the additional data is crucial to understand.Slide4
The Functionality of the Modular Formation Dynamics Tester (MDT)
Reservoir
Formation
Reservoir
Formation
Conventional openhole pressure data is difficult to interpret in some areas of the resource:
Depletion signal impacts interpretation
Low matrix perm in parts of the reservoir
Adding IFA* data increases reliability of the fluid interpretation:
Viscosity
Optical Density
Fluid Density
Resistivity
* (IFA)
InSitu
Fluid Analyser
Sample Chambers
InSitu
Fluid Analyser
High Pressure Pump
Focused Sampling Probe
Large Diameter Probe
Guard Fluid Analyser for focused samplingSlide5
Operational Value of MDT
B. Subsurface Value
C. Project Value
Insitu Fluid
Analysis
(IFA)
IFA & asphaltene EoS
Vertical Interference Test
Acquisition of live
microbial samples
A. Operational Value
Operational Value
of IFA:
Rapid determination of fluid contacts
Allows on the fly programme modification
Allows on the fly well test design modification
Resultant time cost saving on data acquisition.
Conversely
allows you to optimise a programme when you only have a very limited time window.
Recent appraisal experience:
The top ranked objective of a well was to confirm OIP by establishing FWL within the segment
It was critical to ensure that a
reliable
free water sample was captured before weather terminated the operation.Slide6
Operational Value of MDTIFA confirmation that well objective met
What is the critical time estimate for clean-up, before which quality samples can be taken? Is the rock of adequate mobility?
Should the sample point be re-placed along the open-hole environment and clean-up restarted?
Under poor weather conditions, when have the objectives been met, and thus can the run be terminated?Slide7
Operational Value of MDTIFA confirmation that well objective met
Shut-in
Shut-in
Resistivity
DensitySlide8
Operational Value of MDTIFA confirmation that well objective metWell Objective (#1)Confirm OIP by establishing FWL within segment.
IFA Observation
FLOWING: Resistivity saturated up to 6900s, but after this resistivity drops in spikes: non-continuous water phase (droplet) becomes more continuous; relatively low viscosity bulk phase
SHUT-IN: After the pumps are stopped at 10600s two immiscible fluids appear to segregate in the flowline, and a water density is measured at the AFA sensor at the bottom of the flowline
IFA InterpretationMixed flow of two immiscible fluids
when samplingFree water phaseOil phase or mud filtrate
8
Reliable
InformationSlide9
Pressure
Data
Subsurface Value
of MDT
IFA integration with lab and depletion data
C. Project Value
Insitu Fluid
Analysis
(IFA)
Acquisition of live
microbial samples
A. Operational Value
Subsurface Value
of IFA and asphaltene EoS:
Alternate
matches to the petroleum system model
Connectivity and
compartmentalisation
IFA Data
Reliable
Information
B. Subsurface Value
IFA & asphaltene EoS
Vertical Interference TestSlide10
Subsurface Value of MDTVertical Interference Test Data
C. Project Value
Insitu Fluid
Analysis
(IFA)
Acquisition of live
microbial samples
A. Operational Value
Subsurface Value
of Vertical
Interference
Test data:Uncalibrated petrophysical model
DST
test / no test
decision required
K
h
and
K
v
/Kh uncertainty in
missing core interval
B. Subsurface Value
IFA & asphaltene EoS
Vertical Interference TestSlide11
Project Value of MDTAcquisition of live microbial samples
Insitu Fluid
Analysis
(IFA)
C. Project Value
Acquisition of live
microbial samples
A. Operational Value
Project Value
in acquisition of live microbial samples
Reduce uncertainty on reservoir souring mechanism and evaluate injection water design options
Recent appraisal experience:
A specialised bottle preparation and sample handling protocol has been developed between BP,
OilPlus
and Schlumberger
Pressurised water samples are not required for molecular work
Pressurised water samples are required for transferring and setting up the culture
After
three months
incubation
of the pressurised
culture no significant hydrogen sulphide generation was observed (multiple bottles for each penetration).
B. Subsurface Value
IFA & asphaltene EoS
Vertical Interference TestSlide12
Summary and ConclusionsOperational Value of InSitu Fluid Analyser (IFA):When and where
to sample relative to well objectives
Subsurface Value
of IFA & asphaltene Equation of State:Alternate matches to the petroleum system modelConnectivity and compartmentalisation
Subsurface Value of Vertical Interference Test data:DST test / no test decisionK
h and Kv/K
h in missing core intervalProject Value of acquisition of live microbial samplesSlide13
QuestionsThank you for your attention and interest.
Credit:
Paul
Roylance & Gavin Fleming (Operations Geologists)Ilaria de Santo & Jonathan Haslanger (Schlumberger)Keith Robinson & Richard Jonson (Oil Plus)