Numerical Analysis of CO2 Behavior in the Subsea Pipeline, Topside and Wellbore With Reservoir Pressure Increase over the Injection Period

Min, Il Hong; Huh, Cheol; Choe, Yun Seon; Kim, Hyeon Uk; Cho, Meang Ik; Kang, Seong Gil

doi:10.7846/jkosmee.2016.19.4.286

Cited by 3 publications

(2 citation statements)

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“…Table 2 lists the bottom hole pressure, topside operating pressure, and heater set temperature for each numerical analysis case. In the previous study by the authors, the operating pressure near the CO 2 critical pressure (Pc = 73.8 bar) occurred at the topside during the injection period (approximately 54 months), and the temperature of the CO 2 arriving at the topside was calculated to be 5.7 • C [5]. When the topside CO 2 was heated to a near-critical temperature (Tc = 30.9 • C) using the heater, the flows in the topside pipeline and injection wellbore became unstable.…”

Section: Energies 2018 11 X For Peer Review 6 Of 19mentioning

confidence: 99%

“…In a previous study [2][3][4] by the authors of this paper, a depleted gas field in the East Sea of Korea was studied as a storage reservoir. Near-critical point flow and supercritical state flow of CO 2 were found to occur in the topside pipeline of the offshore platform and the upper part of the injection wellbore at a specific injection point, thereby causing flow instability in the pipeline [5]. Such flow instability can cause an additional pressure drop in the pipeline or disable flow control.…”

Section: Introductionmentioning

confidence: 99%

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Instability Analysis of Supercritical CO2 during Transportation and Injection in Carbon Capture and Storage Systems

Min

Kang²,

Huh

2018

Energies

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Captured CO2 is in a subcritical state, whereas CO2 deep underground is in a supercritical state because of the high geothermal heat and pressure. The properties of CO2 can change rapidly at the critical point and in the near-critical region during the transportation and injection process. This study aims to identify the instabilities in the CO2 flow in these regions, along with the causes and effects, during the transportation and injection process, and propose relevant design specifications. Thus, the critical points and near-critical region of CO2 flow were numerically analyzed. The unstable region is presented in terms of temperature and pressure ranges, and the changes in the CO2 properties in this region were analyzed. In the unstable region, the sudden change in density was similar to the density wave oscillation of a two-phase flow. The CO2 stability map we obtained and the stability map of supercritical water show similar trends. Flow instability was also found to occur in standard CO2 transportation pipelines. We demonstrate that flow instability in CO2 transportation and injection systems can be avoided by maintaining the proposed conditions.

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Section: Energies 2018 11 X For Peer Review 6 Of 19mentioning

confidence: 99%