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Fluid Flow Through The Fracture under Different Stress-state Condition

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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Fluid Flow Through The Fracture under Different Stress-state Condition

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  1. Fluid Flow Through The Fracture under Different Stress-state Condition Vivek Muralidharan Dicman Alfred Dr. Erwin Putra Dr. David Schechter

  2. 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

  3. Experimental Results Overburden experiments for unfractured core Overburden experiments for fractured core

  4. Permeability changes at variable overburden pressure kav km

  5. 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 ?

  6. Experimental Data Analysis Parallel plate assumption: w A Average Permeability : l Combine above equations to determine w: Contribution flow from matrix and fracture systems:

  7. Fracture Permeability or      : Hysteresis

  8. 500 psia 1000 psia 1500 psia Fracture Aperture w w w

  9. Dual Porosity Dual Permeability Single Porosity Matrix Flow Rate

  10. Dual Porosity Dual Permeability Single Porosity Fracture Flow Rate Km = 200 md Kf = 10,000-50,000 md

  11. Modeling Laboratory Experiment

  12. 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

  13. Example of flow through single fracture aperture

  14. Simulation Results

  15. Match between Laboratory data and Simulation Results

  16. Match between Laboratory data and Simulation Results (Continued)

  17. Lesson Learned ! The fracture aperture (fracture permeability) must be distributed

  18. Actual Fracture Face

  19. Log-normal Distribution of Fracture Aperture

  20. Generated Core Surface from Log Normal Distribution

  21. Variogram Modeling to Generate Fracture Aperture Distribution

  22. Core Surface Generated after Krigging

  23. Example of flow through different fracture apertures

  24. 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.

  25. 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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