An Optimization Protocol Applicable To Water Flooding Flow Rates On Pattern Based Field Development Studies

Open Access
Author:
Zhang, Yi
Graduate Program:
Petroleum and Natural Gas Engineering
Degree:
Master of Science
Document Type:
Master Thesis
Date of Defense:
May 03, 2015
Committee Members:
  • Turgay Ertekin, Thesis Advisor
Keywords:
  • optimization
  • water flooding
  • flow rates
  • well patteren
Abstract:
In view of various methods of depletion and relevant constraints, reservoir simulation is proved to be a reliable approach in estimating reservoir performance and production, and predicting the final recovery efficiency. Smart well control was initiated and developed in the 1970s, and predicted to be useful for enhancing field production efficiency for several specific cases. However there are scarce efforts in evaluating the influence of flow rates in optimizing the production of well patterned fields by reservoir simulation. Here a mathematical theory of oil production rate optimization was analyzed; the numerical module based on Jacobian matrix iterations was developed to provide solutions in field production simulation; an optimization algorithm based on Newton’s method was developed and applied to the numerical module to find the optimized oil production rate and water injection rate to maximize production efficiency. The optimization process was applied to a five-spot well patterned field, with one production well in the center and four injection wells around it. Based on this approach in locating the optimum production schedule, the model allows estimating the ultimate maximum production rate locally by artificially controlling both the water injection and oil production rates, thus enhancing the production. The model is proved to be a useful tool to estimate well-patterned reservoir production by various tests. Sensitivity tests were also performed to accelerate the optimization process, which could substantially increase the feasibility of this model. It is evident that smart well real-time control of both water injection rate and oil production rate on the specified five spot well patterned black oil field within two months period will significantly enhance the recovery efficiency to the rate of 16%.