Chemical EOR (CEOR) can be economic in a low-price environment, but it requires economic insights be integrated into the initial reservoir screening, laboratory and numerical simulation evaluations, and continued review through field implementation. The CEOR economic evaluation for the Sabriyah Lower Burgan (SALB) using this integrated process found that surfactant-polymer and alkaline-surfactant-polymer flood had different economic potentials due to different oil recoveries, facility costs, and operating costs. Initial reservoir screening of the SLAB indicated that LoSal and CO2, flooding might also have economic potential. Laboratory corefloods injecting field proportioned volumes of chemical solutions using dead oil and reservoir rock resulted in chemical cost average $3.12 per incremental barrel of oil for alkaline-surfactant-polymer formulations and $18.61 for surfactant-polymer formulations. Live oil corefloods for corresponding chemical formulations cost per incremental barrel estimates were $3.70 and $7.83. LoSal process provided no incremental oil based on laboratory coreflood results. Numerical simulation forecast economics included chemical costs, estimated operating costs, facilities cost, drilling of wells, and other capital costs. 2.2, 5.4, and 60 MMbbl pilots forecast by numerical simulation indicated that alkaline-surfactant-polymer cost per incremental barrel of oil was $28.63, $10.42, and $10.95 for the respective pilot sizes. Smaller pilots show a greater impact of fixed costs such a facilities and new wells. 5.4 and 60 MMbbl pilots paid out at 3.4 years or less. Corresponding discounted rates of return were up to 14%. Sensitivity analysis indicated that crude oil price has the greatest effect on chemical enhanced oil recovery economics, regardless of pilot size. This paper summarizes how economic applications at each phase of a chemical flood evaluation are performed and how those evaluations can be understood and applied to prevent adverse project selection. Economic parameters should be evaluated at various phases of project evaluation, influencing decisions to move forward. Methods of evaluation at each phase are documented and discussed using the Sabriyah, Lower Burgan study as a basis.
CO2 EOR projects have experienced localized success in the United States due to past investments in CO2 infrastructure made possible by no longer existing government incentives. Many countries mistakenly look at these successful cases, along with the environmental benefit of carbon capture, and embarked on a quest for a CO2 EOR projects prior to securing a CO2 source. This paper discusses the available EOR agents beyond CO2.
This paper is based on efforts made to select EOR agents for a Rocky Mountain region reservoir, and uses a 10 MMBBL mechanistic model to assess EOR agents. Sourcing, purchase volumes, costs, infrastructure requirements, and a brief summary of the benefits and challenges are presented for the following EOR technologies: Carbon DioxideEthane + other Hydrocarbon GasesFlue Gas (90% N2, 10% CO2)NitrogenAlkali (different types)Surfactant (different types)Polymer (different types)Combinations of alkali, surfactant, and polymer
The logistic considerations identified in the evaluation of the Rocky Mountain region field are universal and can assist EOR agent selection in North America, the Middle East, and anywhere on Earth.
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