Feasibility Investigation of CO2 Miscible Flooding in South Slattery Minnelusa Reservoir, Wyoming

Abstract

A study using experiment and full-field reservoir modeling investigated and optimized the design of a CO 2 miscible flooding project for the Minnelusa reservoir of the South Slattery field. The study began with extensive data gathering in the field and building a full-field three-dimensional geologic model. A fullfield simulation model with relatively coarse gridding was subsequently built and used to history match the depletion and waterflood. This history matching model highlighted areas in the field with current high oil saturations as priority targets for CO 2 flooding and generated a forecast of reserves from continued waterflooding. The estimation of minimum miscibility pressure was conducted with the slimtube method. A fullfield CO 2 model with more finely gridded patterns was built using oil saturations and pressures at the end of history in the waterflood model. The CO 2 model identified the best patterns for CO 2 flooding and was instrumental in selecting a strategy for sizing the initial flood area and in determining the size, location, and timing of future expansions of the CO 2 flood. Continuous CO 2 miscible injection and alternating were simulated. CO 2 WAG injections were simulated mainly to observe the improvement of low sweep efficiency caused by override and unfavorable mobility ratio. Main considered sensitivities included the WAG ratio and slug size. The integrated recovery efficiency comparison of CMI and WAG was used to demonstrate the mobility control of the WAG process.

A review of the flow characteristics of shale oil and the microscopic mechanism of CO2 flooding by molecular dynamics simulation

“…In the selection of displacement media, experimental studies and field development reports have proved that CO 2 injection can effectively improve oil recovery and achieve CO 2 storage (Chen et al, 2010;Gao et al, 2010;Liu et al, 2020). CO 2 is dissolved in the crude oil, which leads to the expansion of the crude oil volume, thus reducing the viscosity of the crude oil, so that the crude oil mobility is improved (Mondal and De, 2015).…”

Experimental Investigation of Formulation and Field Performance of Formate Based Drilling Fluid System for Vertical Well Drilling

“…[13] In addition, formate brines have been passing the most severe corrosion tests. [14][15] A review of operator's feedbacks from long term use was recently published by Olvik et al [16]. It underlines the drilling benefits and their operational success.…”