Geomechanics Applications to Drilling, Hydraulic … for drlg-HF... · Geomechanics Applications to...
Transcript of Geomechanics Applications to Drilling, Hydraulic … for drlg-HF... · Geomechanics Applications to...
Geomechanics Applications to Drilling, Hydraulic
Fracture Design, Completion Integrity and Reservoir
Management
Mohammed Ahmed Mohiuddin
Principal Geomechanics Engineer
SPWLA –Kuwait Presentation
15 January 2013
Outline
Introduction
Workflows
Field examples
Discussion
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Geomechanics …
Excavation
stress
pressure
temperature
other things…
Application of Geomechanics
During Production & Injection
Leakage of injected
gas/steam
Subsidence
Cap-rock integrity
Water-cut
Well construction trends
3D Geomechanics Workflow
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Seismic
Framework
Model
Initial
Stress Model
t =0
t =10yr
Dynamic Mechanical Earth Model
Logs/Cores Framework
Model
1D MEM
Properties Model
Pore Pressure Model
Prediction
Surveillance
Monitoring
Design
Drill
Data audit
MEM construction
Wellbore stability analysis
DrillMAP
Drilling optimization
LWD data acquisition
PP & WBS model update
Drilling monitoring
Instability monitoring
Diagnosis & remedy
Model & database update
Recommendation
Communication
Future well planning
Evaluate
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Three Phase Process
Effects of Reservoir Depletion
Pp
sV
sh
Depletion
sV = constant
Pp-
pp
sV = constant
sh - sh Pp-
pp
sh
sv
sh sh
Injection and Loss of Fracture Containment
Compaction-Induced Well Integrity Problems
Compacting Reservoir
Worst at crest
Any stretch in overburden
causes extension in casing etc.
Shear & local plastic
deformation
Euler buckling
Slip on Fractures and Planes of Weakness
With Depletion (and Compaction and Stress Transfer)
High sh
region (low angle shear)
Flanks Shoulders Crest Shoulders Flanks
Reservoir
compaction
High
region Slip planes
in overburden
Lmst
Marl
Anhydrite
Natural Fracture Conductivity
Under shear and normal deformation
(s,
s
s
Fault Re-activation Due to Depletion/Injection
sH > sv
sn = sn - p
Log data
Drilling data
Mechanical property correlations
Coupled Modeler
Fault surfaces
Seismic horizons
Petrophysical property correlations
Petrel Model
Eclipse Model
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Coupled Reservoir Geomechanics Modeling Workflow
Eclipse Reservoir Simulator
P, T
PVT Tables
K, f
VISAGE Geomechanical
Simulator
2-Way Coupling
4-D
Micro-seismic
Completions
Sector Model
Fault Stability
Toolkits
Completion
Integrity
1-D MEM
Field Example: Lack of BHP Increase from Injection Reservoir Simulation Without
Geomechanics Reservoir Simulation
With Geomechanics
Client expected to see large pressure
increase from injection
Instead small pressure rises and falls
from injection were observed
Field Example: Hydraulic Fracture Containment with
Produced Water Re-injection
Scenario 1 Scenario
Scenario 1 proposed by client
Scenario 2 recommended based on results from coupled reservoir geomechanics modeling
Field Example: Reservoir Compaction with Production
Geomechanics Prediction
Compaction determined by two independent methods difference of ~5 cm
Prediction helped in development planning & seismic inversion confirmed
prediction
4-D Seismic Inversion
Field Example: Prediction of Completion Failure
Excessive shear strains along well path
Successfully predicted wellbore integrity problems in formation where not previously expected
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0 1 2 3 4 5 6 7
Field data
No history match
Geomechanics
WBHP (psia)
Time (year)
Field Example: History Matching With Geomechanics
Two fracture sets were implemented Different fracture strike, spacing and
conductivity
Hydraulic Fracture direction
Sig H
Sig h
Vertical
Well
Fracture
Confinement
Horizontal
Well
Failure & deterioration of wellbore LWD resistivity images of breakouts and fractures
Ultrasonic and stand-off calipers
LWD resistivity for drilling fluid-shale interaction and mud invasion
Formation properties
Pore pressure
Real time link
LWD configuration for geo-steering
with Rotary Steerable System
Laterolog resistivity
Array resistivity Nuclear
Resistivity
& annular pressure
Density, porosity &
ultrasonic caliper
Annular Pressure While Drilling - Real time ECD at BHA
Cavings monitoring Cavings rate
Failure mechanism
Real Time & Time-Lapse Data While Drilling Phase
Example of Updating: Pre-drill Models Contains Uncertainty
Ref: Malinverno, A., Sayers, C., Woodward, M. and
Bartman, R. (2004) SPE 90001
Reducing Uncertainty Ahead of Bit
Mud Weights
Sonic
Pore P
Data
Ref: Malinverno, A., Sayers, C., Woodward, M. and
Bartman, R. (2004) SPE 90001
3D Geomechanics – The Differentiator http://www.slb.com/services/technical_challenges/geomechanics.aspx
Real-Time data has
tremendous value when
integrated within a
“predictive” environment