CO2 Injection Project Analysis Using Application of Integrated Model and Optimization

Abstract

Carbon Dioxide (CO2) injection is a common process used to increase hydrocarbon production in oil and gas fields, which is known as the enhanced oil recovery (EOR) process. This paper presents modeling of a carbon capture, utilization and storage (CCUS) project using an integrated operation and optimization approach. In this case study, the subsurface system consists of two different reservoirs, a gas condensate and an oil reservoir. The products from the two reservoirs are processed in a single surface processing facility. The CO2 will be captured from both reservoirs and injected into the oil reservoir after being processed in the surface facility. The CO2 from various capture processes will produce different types of residual components, and the effects of different compositions of the injected CO2 stream on field economic revenue will be studied. The verification of extra cost by increasing the CO2 mole fraction in the recycle system is modeled in the economic cost equation. The final surface separation products will be condensate (oil), natural gas liquid (NGL), and sales gas. Various derivative-free optimization methods will be used to maximize the net present value (NPV) of the CO2 EOR project. The decision variables are the multi-stage separator pressure conditions (surface parameters) and the CO2 injection rate (sub-surface parameter). Optimization results using different optimization methods will be compared to determine the best field operating parameters. The possibility of combination with water injection will also be investigated to determine the best injection scenarios. An integrated analysis of the CO2 injection process provides a thorough and comprehensive understanding of the performance of the complete CO2 injection value chain. Optimization at the field scale provides insights into the subsurface response to field scale parameter variations. The integrated approach presented in this paper will provide a basis to evaluate CO2 EOR scenarios compared to other injection strategies, such as surfactant or polymer injections.

Scenario Analysis of Carbon Capture, Utilization (Particularly Producing Methane and Methanol), and Storage (CCUS) Systems

“…This result potentially enhances public awareness and acceptance. Similar work has been developed by Rahmawati et al and Klokk et al, and, for this case, set in Norwegian regions, the net present value is maximized, allowing a profitable system in the economic sense, even if expensive infrastructures are used. The net present value is also maximized by Kwak and Kim analyzing the influence of oil and carbon dioxide price on economic results.…”

Optimization of CCUS supply chains in the UK: A strategic role for emissions reduction

“…Four business models with different stakeholders involved in carbon supply chains are presented by Yao et al (2018). Different derivative-free optimization methods are used by Rahmawati et al (2015) to maximize the net present value (NPV) of a CCUS supply chain with oil recovery with CO2 utilization and to compare the results with other injection strategies. The NPV is also optimized for these systems by Jahangiri and and by Kwak and Kim (2017) who consider fluctuating values of oil and carbon price.…”

Investigating the efficiency of gas re‐injection process of an oil field using combined integrated field simulation and intelligent proxy model application

“…[4] Several authors studied gas re-injection in two or more different reservoirs that share the same surface facilities using integrated modelling. [1,2,[5][6][7][8] All the mentioned studies have focused on how the gas is distributed among fields and not on how the gas distribution among injection wells may affect the Net Profit Value (NPV). Therefore, the main goal in this study is to investigate these variables.…”

“…This makes the integration of asset management hard, even in cases in which there is a high potential of integration. [1,2,[5][6][7][8] All the mentioned studies have focused on how the gas is distributed among fields and not on how the gas distribution among injection wells may affect the Net Profit Value (NPV). Therefore, comprehensive management of the field is a very difficult task due to lack of integration.…”