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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. Fracture. A=4.96 Cm 2. 4.98 Cm. Matrix. Accumulator 1. Accumulator 2. HYDRAULIC JACK. PERMEAMETER. BLACK. CORE HOLDER. RED.

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slide1

Fluid Flow Through The Fracture under Different Stress-state Condition

Vivek Muralidharan

Dicman Alfred

Dr. Erwin Putra

Dr. David Schechter

slide2

Fracture

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

slide3

Experimental Results

Overburden experiments for unfractured core

Overburden experiments for fractured core

slide5

Motivation

  • 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 ?
slide6

Experimental Data Analysis

Parallel plate assumption:

w

A

Average Permeability :

l

Combine above equations to determine w:

Contribution flow from matrix and fracture systems:

slide7

Fracture Permeability

or

 : Hysteresis

slide8

500 psia

1000 psia

1500 psia

Fracture Aperture

w

w

w

slide9

Dual Porosity

Dual Permeability

Single Porosity

Matrix Flow Rate

slide10

Dual Porosity

Dual Permeability

Single Porosity

Fracture Flow Rate

Km = 200 md

Kf = 10,000-50,000 md

slide12

Simulation Parameters

  • 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
slide17

Lesson Learned !

The fracture aperture (fracture permeability) must be distributed

slide20

Generated Core Surface from

Log Normal Distribution

slide21

Variogram Modeling to Generate

Fracture Aperture Distribution

slide24

Conclusions

  • 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.
slide25

Conclusions (Cont’d)

  • 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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