Pore-scale visualization and quantitative analysis of the spontaneous imbibition based on experiments and micro-CT technology in low-permeability mixed-wettability rock
KAUST DepartmentComputational Transport Phenomena Laboratory (CTPL) King Abdullah University of Science and Technology (KAUST) Thuwal Saudi Arabia
Permanent link to this recordhttp://hdl.handle.net/10754/661384
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AbstractThe pore-scale imbibition mechanism in fractured water-wetted reservoirs has been acknowledged as an efficient tool to enhance oil recovery. Most rock in a natural reservoir is mixed-wetted, but most studies on the pore-scale imbibition process only focused on the water-wetted rock. This paper adopts two mixed-wetted core samples for microspontaneous imbibition experiment, micro-CT scanning, and nuclear magnetic resonance (NMR) test. The results indicate that the pore radius distribution of the segmented CT images is consistent with that of the NMR test. The microimbibition recovery ratio of core No. 34-1 and core No. 64 in the spontaneous imbibition experiment are 27.7% and 58.2%, which agrees well with that computed by the micro-CT scanning image (27.63% and 56.09%). Based on the segmented images, the influences of the Jamin's effect, pore size distribution, and wettability on the microspontaneous imbibition are visualized and quantitatively studied. The Jamin's effect is the important factor that hinders the microimbibition process. The main pore size of imbibition distributes in the range of 1-25 μm. Furthermore, the pore-scale spontaneous imbibition process in a single pore with mixed wettability is investigated and analyzed. The relationships among the contact angle, capillary force, recovery ratio, wettability, and the microimbibition recovery are revealed.
CitationLiu, Q., Song, R., Liu, J., Lei, Y., & Zhu, X. (2020). Pore-scale visualization and quantitative analysis of the spontaneous imbibition based on experiments and micro-CT technology in low-permeability mixed-wettability rock. Energy Science & Engineering. doi:10.1002/ese3.636
SponsorsWe greatly appreciate the financial support of the National Natural Science Foundation of China [Grant No. 51909225]; National Science and Technology Major Project of China [Grant No. 2017ZX05013001-002]; and the Open Research Fund of State Key Laboratory of Geomechanics and Geotechnical Engineering, Institute of Rock and Soil Mechanics, Chinese Academy of Sciences [Grant No. Z017009]. The authors also acknowledge financial support from China Scholarship Council.
JournalEnergy Science & Engineering
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