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Numerical Modeling of Diagnostic Fracture Injection Test

Hasanpour Kelishomi, Milad | 2022

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  1. Type of Document: M.Sc. Thesis
  2. Language: Farsi
  3. Document No: 54950 (06)
  4. University: Sharif University of Technology
  5. Department: Chemical and Petroleum Engineering
  6. Advisor(s): Shad, Saeed; Zivar, Davood
  7. Abstract:
  8. Diagnostic Fracture Injection Test (DFIT) uses to identify the characteristics of the reservoir, including minimum horizontal stress, permeability, initial reservoir pressure, etc. The general steps of this process include fluid injection, fracture initiation in the matrix, fracture propagation and its closure due to fluid leak-off. The results of DFIT are analyzed in two stages based on the fracture closure event. The objective of this study is to investigate the effect of leak-off mechanisms on pressure-dependent leak-off (PDL), tip extension and fracture storage. To do so, different methods are used for identifying the cooperating parameters at each step. In order to analyze DFIT, a series of homogeneous reservoir models with and without the presence of natural fracture have been created using ABAQUS software. In the first step, fluid is injected and pressure behavior is obtained, which is used to identify the pressure corresponding to the initiation and propagation of fracture. In the next step, the pressure fall-off due to fluid loss is monitored. This step of the test is used to identify the fracture closure pressure, the leak-off mechanism, natural fracture detection and minimum horizontal stress. The results show pressure-dependent leak-off is present in all created models according to the method of calculating leak-off in software. In addition, in the naturally fractured models, the phenomenon of limited fracture storage is observed in the results. The application of diagnostic plots including G-Function time and semi-log derivatives of pressure is not limited to the leak-off mechanism and is also used to identify the in-situ stresses. In this thesis, a method called multiple DFIT has been proposed in models with natural fractures or fault planes in order to determine the position of these discontinuities relative to the horizontal well. Also, in this method, the NF closure pressure in the diagnostic plots has been used to provide an estimate of the maximum horizontal stress
  9. Keywords:
  10. In-Situ Stresses ; Crack Closure ; Leak-Off ; Before Closure Analysis ; Diagnostic Fracture Injection Test (DFIT) ; Numerical Modeling

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