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Experimental Investigation of Mud-Induced Formation Damage in Fractured Reservoirs

Bagheri, Abdolhossein | 2010

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  1. Type of Document: M.Sc. Thesis
  2. Language: Farsi
  3. Document No: 41081 (06)
  4. University: Sharif University of Technology
  5. Department: Chemical and Petroleum Engineering
  6. Advisor(s): Rashtchian, Davood; Moghadasi, Jamshid
  7. Abstract:
  8. Productivity reduction of oil and gas wells due to mud induced permeability impairment is one of challenging problems in drilling and production studies. This phenomenon is of prime importance in fractured reservoirs in which high permeability fracture networks act as conduits for feeding gas or oil from a tight matrix to the wellbore. Up to now, many experimental and modeling investigations have been done in formation damage in conventional reservoirs. But in spite of large contribution of fractured reservoirs in total hydrocarbon reserves, there is very little work reported in the literature investigating formation damage in such reservoirs. In this thesis, the effective parameters in fracture permeability impairment during overbalanced drilling such as mud additives, fracture width and overbalanced pressure were examined. For this purpose, a series of core flood experiments with stainless steel cores of different fracture width and various drilling fluids were performed. Also, a mathematical model for drilling fluid flow through a fracture was derived using momentum and continuity equations. Experimental results confirmed that drilling fluids can cause severe and irreversible permeability damage to the fracture system. The mud loss volume increased by increasing overbalanced pressure and fracture width. By comparison of model and experimental data, it was found that the accuracy of model predictions is a function of rheological properties of drilling fluid. The model computed the fluid loss volume of high viscosity fluids with a less but acceptable accuracy
  9. Keywords:
  10. Formation Damage ; Fractured Reservoirs ; Relative Permeability ; Drilling Fluid ; Mud Invasion ; Yield-Power Fluid

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