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Fluid Flow Through The Fracture under Different Stress-state Condition

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Fluid Flow Through The Fracture under Different Stress-state Condition

Vivek Muralidharan

Dicman Alfred

Dr. Erwin Putra

Dr. David Schechter

A=4.96 Cm2

4.98 Cm

Matrix

Accumulator 1

Accumulator 2

HYDRAULIC JACK

PERMEAMETER

BLACK

CORE HOLDER

RED

Graduated Cylinder

Graduated Cylinder

PUMP 1

PUMP 1

Schematic of Experiment Apparatus

Overburden experiments for unfractured core

Overburden experiments for fractured core

- How do we analyze the experimental results ?
- What information can be deduced from experimental results?
- Fracture permeability
- Fracture Aperture
- Matrix and fracture flow contributions
- How these properties change with overburden stress
- How do we model this experiment ?

Parallel plate assumption:

w

A

Average Permeability :

l

Combine above equations to determine w:

Contribution flow from matrix and fracture systems:

- Single phase black oil simulation
- Laboratory dimensions (4.9875” x 2.51”)
- 31x1x31 layers
- Matrix porosity = 0.16764
- Matrix permeability = 296 md
- Fracture properties is introduced in 16th layer
- Fracture porosity = 0.00563972
- Mean fracture aperture = 56.4 micro meter
- Fracture aperture is varied using log normal distribution and geostatistical approach
- Fracture permeability is generated from fracture aperture distribution using modified parallel plate model

The fracture aperture (fracture permeability) must be distributed

Log Normal Distribution

Variogram Modeling to Generate

Fracture Aperture Distribution

Krigging

- Change in overburden pressure significantly affects the reservoir properties.
- The change in matrix permeability under variable overburden pressures is not significant in contrast with that effect on fracture aperture and fracture permeability.
- The simulation results suggest that a parallel model is insufficient to predict fluid flow in the fracture system. Consequently, the spatial heterogeneity in the fracture aperture must be included in the modeling of fluid flow through fracture system.

- The results also infer that the effect of stresses may be most pronounced in fractured reservoirs where large pressure changes can cause significant changes in fracture aperture and related changes in fractured permeability.
- At high overburden pressure the influence of existing fracture permeability on fluid flow contributor in permeable rocks (> 200 md) is not too significant.

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