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Copy of Formation Mechanics Group I

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by

Kar Kiat Tan

on 20 November 2012

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Transcript of Copy of Formation Mechanics Group I

Case Description
Planned Wells & Well Sizes
Drilling Time Frame Recommendation
Field Data Acquisition
Well Trajectory
Compaction & Sand Production
Gas Condensate Reservoir
Depth: 4,877 m
High Pressure: 105 MPa

Reservoir Layers:
Upper Layer:50 m
Lower Layer:150 m

Weak Water Drive
60° dip (NW-SE) Case Description Planned Wells &
Well Sizes Drilling Time Frame Recommendation Field Data Acquisition Where To Drill The Wells? Well Trajectory Production requirement: 12 MMSm3

Well capacity:
Large well: 5 MMSm3
Small well: 1 MMSm3

Options:
2 x large wells & 2 x small wells
3 large wells Recommendation:

3 x large wells

Advantages:
Higher capacity
Lower cost & risk

Possible disadvantages:
Drainage area
Stability Drilling window:
narrow (4.2 MPa)

Equivalent mud weight (~2.28 kg/kg)
1st year production capacity What types of acquisition?

VSP tie-in with seismic data
Logging data for formation characterization &
reservoir geo-modeling
Leak Off Test (LOT) & XLOT
Core data for rock mechanics studies
4D seismic Reference point

Drilling window
wider drilling window below reference point
ECD consideration Deviated well:
reduced risk of compressive casing damage
following reservoir structure
optimize drainage area

But
stable drilling
casing crushing (large depletion & soft formation)
casing bending (non-uniform compaction)
data acquisition (more uncertainties) Compaction Without Arching isolation
selective perforation
gravel pack
frac. and pack SW-NE cross-section Maximum compaction:

Total:
with arching: 0.24% (0.48m)
without arching: 0.41% (0.82m) Valuable to reduce risks & uncertainties

Data obtained during 1st stage drilling
Throughout production Why?

Stress & rock mechanics studies
Better development planning Sand Production Bao Chen
Carolin Jahns
Kar Kiat Tan
Reza Dashtpour
Sarah Muehlboeck
Steven L. Paulus Formation Mechanics
Group I
Project Case 1 Contents
layer 1 0.76% (0.38m)
layer 2 0.29% (0.44m) With Arching Avoid :
fault
hot spot
less stable area
Full transcript