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Modeling, Studying and Improving of Acid Fracturing in Geo-Mechanical Approach

Noorali Kheirzad, Mohammad Amin | 2016

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  1. Type of Document: M.Sc. Thesis
  2. Language: Farsi
  3. Document No: 48030 (06)
  4. University: Sharif University of Technology
  5. Department: Chemical and Petroleum Engineering
  6. Advisor(s): Ghotbi, Cyrus; Taghikhani, Vahid; Badakhshan, Amir
  7. Abstract:
  8. The acid fracturing process is a thermal, hydraulic, mechanical, geochemical and geomechanical coupled phenomena in which the behavior of these variables are interrelated. To model the flow behavior of an acid into a fracture, mass and momentum balance equations are used to draw 3D velocity and pressure profiles. Part of the fluid diffuses or leaks off into the fracture walls and dissolves part of the fracture face.An acid balance equation is used to draw the concentration profile of the acid and to account for the quantity of rock dissolved. An algorithm is developed for this process to generate the final conductivity distribution after fracture closure. The objective of modeling acid fracturing is to determine the optimum condition that results in a petroleum production rate increase.The conductivity value and acid penetration distance both affect the final production rate from a fracture. Treatment parameters are simulated to draw a conclusion about the effect of each on the conductivity and acid penetration distance. The conductivity distribution file from an acid fracturing simulator is imported into the ECLIPSE reservoir simulator to estimate the production rate. Reservoir permeability is the determining factor when choosing between a high- conductivity value and a long penetration distance. For the model to be more accurate, it needs to be coupled with heat transfer and geomechanical models. Many simulation cases cannot be completed because of numerical errors resulting from the hydraulic model (Navier-Stokes equations). The greatest challenge for the simulator before coupling it with any other phenomena is building a more stable hydraulic solution
  9. Keywords:
  10. Acidizing Treatment ; Conductivity ; Fracture Permeability ; Fracturing Process ; Geomechanical Process

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