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Investigating the Appropriate Decline Curve Model for Heterogeneous Reservoirs

Pourali, Omid | 2018

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  1. Type of Document: M.Sc. Thesis
  2. Language: Farsi
  3. Document No: 51627 (06)
  4. University: Sharif University of Technology
  5. Department: Chemical and Petroleum Engineering
  6. Advisor(s): Masihi, Mohsen
  7. Abstract:
  8. In this research oil production decline curve of heterogonous reservoirs was investigated. Heterogeneity is modeled by percolation theory and using Petrel software and mass balance equations are solved by Eclipse simulation software. In primary production stage which oil flows up the reservoir spontaneously by reservoir high internal pressure, decline curve is exponential. Changes in the characteristic parameter of the exponential decline curve with occupation probability and permeable objects size were investigated.In secondary production stage, after reducing the natural production potential of the reservoir, water injection is used to increase and stabilize the pressure and increase the oil recovery factor. Two important factors in investigating the decline curve of reservoirs subjected to water flooding are breakthrough time and post breakthrough behavior of oil decline curve. In this study, the three methods of Arp’s empirical relations, modified Y method and known oil cut method were used to study the production decline curves in heterogeneous reservoirs under water flooding. Changes in characteristic parameters of each method with occupancy probability and permeable objects size were investigated and scaled curves for these changes were presented. The changes in breakthrough time with occupation degree and permeable objects size were investigated, and it was determined that the breakthrough time with the degree of occupation has a power law relationship that the power of this relationship depends on the size of the permeable objects. Also, the breakthrough time has a power law relation with the size of the permeable objects which the power is a function of occupancy probability.In this research the effect of oil-water relative permeability curves on breakthrough time and post breakthrough behavior of oil decline curve was investigated and observed that the breakthrough time has power law relation with characteristic water oil relative permeability ratio with power of 0/176
  9. Keywords:
  10. Oil Decline Curve ; Break Through Time ; Heterogeneous Reservoirs ; Percolation Theory ; Occupancy Probability ; Permeable Objects Size ; Water Flooding

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