An Assessment of a CO2 Flood for EOR and Sequestration Benefits in the Ordos Basin, Northwest China

Abstract

This study evaluates reservoir and reservoir fluid parameters relevant to CO 2 flooding to enhance hydrocarbon recovery from an Ordos's Basin oilfield located in Northwest China. Field M is a tight sandstone reservoir containing light and low viscosity oil.CO 2 could be available from a power plant and a coal refining factory nearby. Laboratory experiments were conducted for the purpose of determining the crude oil MMP with CO 2 and oil PVT properties. The MMP of CO 2 flooding was determined through slimtube test and calculation of PR3equation. In addition, the utilization factor of CO 2 injected to oil was calculated at MMP with pure CO 2 , and the sequestration potential of CO 2 in field M was calculated with the sequestration coefficient multiplying recoverable reserves. We also quoted the methods mentioned in the Carbon sequestration Leadership Forum to calculate the sequestration potential of Field M. Finally, we draw a contrast among the predictive sequestration CO 2 results, and the contrast show that applying the sequestration coefficient to evaluate the CO 2 sequestration potential of field M is reasonable and reliable.

The Influence of CO2Solubility in Reservoir Water on CO2Flooding and Storage of CO2Injection into a Water Flooded Low Permeability Reservoir

“…The oil recovery factor refers to the stage recovery factor after injection of 0.6PV CO 2 , and the amount of CO 2 storage is the sum of CO 2 in a free state and dissolved state in the reservoir. The definition of geological sequestration coefficient is the ratio of CO 2 buried underground to original oil in place (OOIP) (Shen et al, 2009;Chen et al, 2010;Ran et al, 2012). As saturation pressure is 5.6 MPa, set the bottom-hole pressure of all the schemes during simulation to be 7 MPa to ensure the formation pressure larger than saturation pressure.…”

Challenges Associated with CO2 Sequestration and Hydrocarbon Recovery

“…The evaluation of Changqing oil field, Ordos' Basin, Northwest China, concluded that conducting a CO 2 flood after water flooding could produce 119 million tons of oil and sequestrate 273 million tons of CO 2 [16]. In 2000, the International Energy Agency Weyburn CO 2 Monitoring and Storage Project did a study on CO 2 storage in a partially depleted oil reservoir and found that a $1.5 billion, 30-year commercial CO 2 EOR produced an additional 130 million barrels of oil.…”

“…One of the primary challenges facing CCS and CO 2 EOR is the cost of trapping and delivering CO 2 . Large-scale injection of CO 2 , for any purpose, can only reach its full potential when a supply chain and infrastructure are established, and most locations do not have access to a preexisting CO 2 infrastructure [16,35].…”

“…In one case in the Gazran field, the costs to acquire CO 2 were approximately 11$/metric ton, with recycling costs of approximately 8$/metric ton [16]. In other areas, such as West Texas, prices can be as high as $40/ton with 18 billion tons of CO 2 required, making it very difficult to initiate large-scale CO 2 projects without a proper supply chain.…”

Assessment of Oil Reservoirs Suitable for CO2 Flooding in Mature Oil Reservoirs, Changqing Oilfield, China

“…Klins put forward 12 reservoir and fluid parameters in 1976, and Daniel Diaz put forward 8 parameters (Dickson and Leahy-Dios et al, 2010). So in order to quantitative evaluation, the study should be based on the quantification of various parameters and determine the influence of the parameters (Zhang and Ren et al, 2011;Liao and GAO et al, 2012;Ran and Zhao et al, 2012;Zhao and Liao, 2012;Bang, 2013). In 1992 the Department of Energy entrusted Louisiana State University to study the comprehensive screening method of the reservoir which had finished water flooding and began to CO 2 flooding.…”