Integrated Reseryoir Modeling of a Large Sour-Gas Field With High Concentrations of Inerts

摘要

The LaBarge project demonstrates the successful commercialization of a very large gas resource representative of the increasingly challenging projects faced by our industry. Three particularly distinctive aspects are (1) it is one of the largest acid-gas-reinjec-tion projects in the world, (2) the composition is nearly 80% non-hydrocarbon, and (3) the initial compositional gradient cannot be explained by gravity segregation. This paper describes integrated reservoir modeling studies conducted to evaluate key reservoir and operational uncertainties. The integrated studies led to a new hypothesis for the initial compositional gradient and illustrated fit-for-purpose modeling approaches for reservoir fluid charging and mixing, black-oil simulation, and an integrated production network. The studies were used to optimize the drilling and depletion plan to maximize methane production with current facilities and end-of-field-life assumptions, and to analyze acid-gas injection (AGI) into the aquifer.