Study of phase behavior and physical properties of a natural gas reservoir with high carbon dioxide content

Hao Chen, Shenglai Yang, Xiansong Zhang, Shuangshuang Ren, Kai Dong, Ying Li, Zhan Meng, Lu Wang, Hao Lei and Quanzheng Ma

Greenhouse Gases: Science and Technology, 2016, vol. 6, issue 3, 428-442

Abstract: The discovery of natural gas reservoirs with high and varying CO 2 content (5% to 98%) in China has attracted worldwide attention. In this paper, the phase diagram of natural gas with different CO 2 content was calculated and drawn by PVT Sim 100 which was fitted by experimental data based on the Ruska PVT 2730 apparatus. Both the real critical parameters and the pseudo‐critical para­meters were calculated and compared. Also, the phase state of natural gas along the wellbore in a representative well under both shut‐in and flowing conditions was analyzed. In addition, to clarifying the phase transition process, videos of a gas sample showed variation between supercritical state to gas‐liquid state with isobaric cooling and heating up between 35°C and 25°C. Moreover, the compressibility factor (Z‐factor) of the natural gas with different CO 2 content was chosen as one of the key physical parameters of natural gas to measure at pressures ranging from atmospheric pressure to 45 MPa and temperatures ranging from 40°C to 140°C experimentally. Results show that the Z factor decreases with the increase of CO 2 content in natural gas at isothermal conditions, and increases with the increase of temperature. Furthermore, a new model is proposed to predict pressure and Z factor. The varying CO 2 ‐CH 4 concentrations of this reservoir are relevant to gas compositions which may arise in depleted natural gas reservoirs used for geologic carbon sequestration. © 2015 Society of Chemical Industry and John Wiley & Sons, Ltd

Date: 2016
References: View complete reference list from CitEc
Citations: View citations in EconPapers (1)

Downloads: (external link)
http://hdl.handle.net/10.1002/ghg.1576

Related works:
This item may be available elsewhere in EconPapers: Search for items with the same title.

Export reference: BibTeX RIS (EndNote, ProCite, RefMan) HTML/Text

Persistent link: https://EconPapers.repec.org/RePEc:wly:greenh:v:6:y:2016:i:3:p:428-442

Access Statistics for this article

More articles in Greenhouse Gases: Science and Technology from Blackwell Publishing
Bibliographic data for series maintained by Wiley Content Delivery ().