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The Study of the Effect of Geomechanical Parameters on Hydraulic Fracturing Characteristics in Hydrocarbon Reservoirs by Numerical Modeling

Chiti, Navid | 2017

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  1. Type of Document: M.Sc. Thesis
  2. Language: Farsi
  3. Document No: 50851 (09)
  4. University: Sharif University of Technology
  5. Department: Civil Engineering
  6. Advisor(s): Pak, Ali
  7. Abstract:
  8. The exploitation of oil and gas were changed dramatically with the advent of hydraulic fracturing. By using enhanced oil recovery methods in unconventional reservoirs, USA could raise the rate of production in comparison with the rate of consumption. Hydraulic fracturing is one of the enhanced oil recovery methods.The purpose of this research is the study of the effects of geomechanical parameters in the characteristics of the cracks induced by hydraulic fracturing in unconventional oil reservoirs. The minimum in-situ stress and tensile stress of rock can be overcome by injecting fluid and thus the rock will be cracked. Changes in geomechanical parameters such as modulus of elasticity, in-situ stress, and the injection fluid and fracture mechanic directly affect the geometry of cracks. There are some close form models to predict the hydraulic crack characteristics. KGD and PKN are the two most renowned close form models. Both of them calculate crack characteristics, considering plain strain condition in 2 dimensional space (coordinate) using different approaches (one of them considering plain strain condition in horizontal plain and the other in vertical plain).Some of the effective parameters have been considered in these models (like modulus of elasticity, poison ratio, injection rate and time). But some other effective parameters are not considered in these methods.So to follow this purpose, numerical simulation of hydraulic fracturing have been done in 2D and 3D with ABAQUS software and with the XFEM method. Also to initiate hydraulic cracks the CZM criteria have been used. In this study, the effect of fluid reservoirs compressibility, hydraulic conductivity, injection fluid viscosity, tensile strength of rock and initial pore pressure on cracks induced hydraulic fracture characteristics and geometry are investigated. Finally, the influence of each parameter on hydraulic crack characteristics were studied and a correction factor for close form solutions were proposed. The mentioned study and the correction factors for KGD and PKN are the
    innovations of this research
  9. Keywords:
  10. Hydraulic Fracturing ; Extended Finite Element Method ; Fully Coupled Hydromechanical Analysis ; Oil Tanks ; Numerical Modeling ; Khristianovic-Geertsma-Deklek Model ; Perkins-Kern-Nordgren Model

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