A Potential Evaluation and Pilot Test of CO2 Miscible Injection in Daqing, China

Abstract

The paper introduces the entire process for a CO₂ injection in the Fang-48 Group, Daqing Oilfield. A study using experiment and full-field reservoir modeling investigated and optimized the design of a CO₂ miscible flooding project for Fang-48 Group, Daqing. The study began with extensive data gathering in the field and building a full-field three-dimensional geologic model. A full-field simulation model with relatively coarse gridding was subsequently built and used to history match the depletion and waterflood. The focus of the history match is to highlight the remaining oil area. And another target is to form a favorable system for CO₂ injection. A fine-griCO₂ model is set up after the history match. Both pure CO₂ and WAG injection are simulated. In the continuous CO₂ injection, different injection rates are simulated. In the CO₂ WAG injection simulation, different water-gas ratios were investigated. The efficiencies of mobility control of all cases are analyzed.

Keywords: miscibility, simulation, slimtube, water-alternating-gas