The impact of supercritical CO2 exposure time on the effective stress law for permeability in shale

Tian, Shifeng; Zhou, Junping; Xian, Xuefu; Gan, Quan; Zhang, Chengpeng; Dong, Zhiqiang; Kuang, Nianjie

doi:10.1016/j.energy.2023.129334

Cited by 3 publications

(1 citation statement)

References 47 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The hydrocarbons in low-maturity oil shales comprise already formed petroleum, bituminous substances, and solid organic matter without undergoing thermal degradation. − Accordingly, an in situ heating strategy is introduced as an approach to enable the immobile content (e.g., heavy oil, bitumen, and undegraded kerogen) in low-maturity oil shales to be transformed into mobile light oil (and gas). ,− This in situ heating operation is conducted with a thermal source (like electrical heating and water vapor) injected into a shale reservoir, − allowing the heat conduction behavior to pyrolyze the low-maturity shale oil in the area close to heating the injection well. , To wit, the in situ thermally upgraded area is largely determined by the thermophysical performance of low-maturity oil shales, which further identifies the oil production capacity as well as the potential economic efficiency.…”

Section: Introductionmentioning

confidence: 99%

Evolution of the Anisotropic Thermophysical Performance for Low-Maturity Oil Shales at an Elevated Temperature and Its Implications for Restoring Oil Development

Bai,

Li,

Liu

et al. 2024

Energy Fuels

View full text Add to dashboard Cite

Thermophysical properties determine the thermally upgraded area of low-maturity oil shales, which is of significance for restoring oil recovery but needs more in-depth investigations. We introduced a laser-flash NETZSCH LFA-467 analyzer to measure the dynamic response of thermal diffusivity (D), thermal conductivity (K), and specific heat capacity (c) at an in situ elevated temperature as well as their anisotropy in the orthogonal direction relative to shale bedding. The D and K values decrease with a rising temperature, while c values remain almost unchanged at a high temperature. The total organic carbon (TOC) content significantly affects the D and K values, mainly in the anisotropy coefficient (a newly proposed parameter), but sparingly influences the c values. The anisotropy coefficient of samples with a high TOC content is ∼2 times greater than that with a low TOC content. The greatest D value decay rate of a high TOC content sample reaches ∼75%, while that for a low TOC content sample is ∼43%, found in the bedding-perpendicular samples. Results also suggest that the anisotropy of the thermophysical property derives from the lamellar structure of shale rock; the space (like pore and/or fracture) therein is averse to the heat movement. For the hypothetical vertical well mode or horizontal well mode, the arrangement of reasonable space between wells of heat injection and restoring oil production is of significance under the heating-induced dynamic evolution of thermophysical parameters. Hopefully, this work is helpful in enhancing the knowledge on the heat flow behavior in low-maturity oil shale when thermal upgrading is implemented.

show abstract