Characterization of fracture dynamic parameters to simulate naturally fractured reservoirs

Bahrami, H ; Sharif University of Technology | 2008

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  1. Type of Document: Article
  2. Publisher: 2008
  3. Abstract:
  4. Fractures identification is essential during exploration, drilling and well completion of naturally fractured reservoirs since they have a significant impact on flow contribution. There are different methods to characterize these systems based on formation properties and fluid flow behaviour such as logging and testing. Pressure-transient testing has long been recognized as a reservoir characterization tool. Although welltest analysis is a recommended technique for fracture evaluation, but its use is still not well understood. Analysis of pressure transient data provides dynamic reservoir properties such as average permeability, fracture storativity and fracture conductivity.An infusion of geological knowledge helps reducing uncertainty associated with any well-test interpretation. The static properties of naturally fractured reservoirs such as fracture aperture, fracture spacing and fracture porosity can be obtained from processing of Image Log data. Simulation of naturally fractured reservoirs needs defining fracture permeability, shape factor and fracture porosity in the fracture model. However, in most simulation studies, due to high uncertainties in estimating fracture permeability and shape factor values, these parameters are initially assumed in the model and they are usually tuned during history matching which can be time consuming and also affect other history match parameters. Reservoir simulation results and predictions might be inaccurate if the values of fracture properties in the model are not reliable.This paper shows using image log data associated with welltest analysis in order to determine dynamic fracture parameters such as fracture permeability and shape factor for reservoir simulation. In this study, sensitivity analysis has also been performed on fracture permeability, fracture porosity and shape factor in a real simulation model to show importance of accurate determination of fracture parameters. Copyright 2008.International Petroleum Technology Conference
  5. Keywords:
  6. Average permeability ; Dynamic fractures ; Fluid flow ; Fracture apertures ; Fracture dynamics ; Fracture evaluation ; Fracture model ; Fracture parameter ; Fracture permeability ; Fracture porosity ; Fracture property ; Fracture spacing ; History match ; History matching ; Log data ; Naturally fractured reservoirs ; On flow ; Pressure transient data ; Pressure-transient testing ; Reservoir characterization ; Reservoir property ; Reservoir simulation ; Shape factor ; Significant impacts ; Simulation model ; Simulation studies ; Static properties ; Well-test analysis ; Capillarity ; Flow of fluids ; Mechanical permeability ; Parameter estimation ; Petroleum reservoir engineering ; Petroleum reservoirs ; Porosity ; Sensitivity analysis ; Simulators ; Uncertainty analysis ; Well completion ; Well drilling ; Fracture
  7. Source: International Petroleum Technology Conference, IPTC 2008, Kuala Lumpur, 3 December 2008 through 5 December 2008 ; Volume 1 , 2008 , Pages 473-485 ; 9781605609546 (ISBN)
  8. URL: https://onepetro.org/IPTCONF/proceedings-abstract/08IPTC/All-08IPTC/IPTC-11971-MS/148089