Phase Behavior in Nanopores and Its Indication for Cyclic Gas Injection in a Volatile Oil Reservoir from Duvernay Shale

Author:

Kong Xiangwen1ORCID,Wang Hongjun1,Yu Wei2,Wang Ping1,Liu Li1,Zhang Wenjing3

Affiliation:

1. 1 Research Institute of Petroleum Exploration and Development Beijing 100083 China cnpc.com.cn

2. 2 The University of Texas at Austin Austin TX 78712 USA utexas.edu

3. 3 Beijing Offcn Education & Technology Co. Ltd. Beijing 100083 China

Abstract

Abstract Duvernay shale spans over 6 million acres with a total resource of 440 billion barrels’ oil equivalent in the Western Canada Sedimentary Basin (WCSB). The oil recovery factors typically decrease with the decreasing of gas-oil ratio (GOR) in oil window of Duvernay shale. The volatile oil recovery factors are typically 5–10%. Enhanced oil recovery technologies should be applied to improve the economics of the reservoirs. In this paper, the volatile oil from the Duvernay shale was taken as an example for phase behavior study. We analyzed the nanopore confinement on phase behavior and physical properties of Duvernay shale oil. The shift of critical properties was quantified within nanopores. With the confinement of nanopores, the viscosity, density, and bubble point pressure of the oil decrease with the shrinking of the pore size. Minimum miscibility pressure (MMP) was calculated for different injected gases. The MMP from high to low is N2>CH4>lean gas>rich gas>CO2. In the case of injecting the same gas component, the MMP decreases as the pore size decreases. The wellhead rich gas is suggested to be the main gas source for gas injection in Duvernay shale. The formation pressure should be rapidly increased to the MMP and maintained close to it, which would help to improve the effect of gas injection and enhance shale oil recovery. This paper can provide critical insights for the research of shale oil gas injection for enhanced oil recovery.

Funder

China National Petroleum Corporation

National Science and Technology Major Project

Publisher

GeoScienceWorld

Subject

Geology

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