Study on rock fracture mechanism and hydraulic fracturing propagation law of heterogeneous tight sandstone reservoir.

Autor: Zhao H; Northeast Petroleum University, College of Petroleum Engineering, Daqing, China.; Daqing Oilfield Co Ltd, Daqing, China.; National Key Laboratory of Continental Shale Oil, Daqing, China.; National Engineering Research Center of Oil & Gas Drilling and Completion Technology, Beijing, China., Li W; Northeast Petroleum University, College of Petroleum Engineering, Daqing, China.; National Key Laboratory of Continental Shale Oil, Daqing, China.; National Engineering Research Center of Oil & Gas Drilling and Completion Technology, Beijing, China., Cai M; Northeast Petroleum University, College of Petroleum Engineering, Daqing, China.; National Engineering Research Center of Oil & Gas Drilling and Completion Technology, Beijing, China.; Research Institute of Oil Production Engineering of Daqing Oilfield Co Ltd, Daqing, China.; Heilongjiang Provincial Key Laboratory of Oil and Gas Reservoir Stimulation, Daqing, China., Ma B; Northeast Petroleum University, College of Petroleum Engineering, Daqing, China., Xie X; Northeast Petroleum University, College of Petroleum Engineering, Daqing, China.; National Key Laboratory of Continental Shale Oil, Daqing, China., Zou L; Northeast Petroleum University, College of Petroleum Engineering, Daqing, China.; National Key Laboratory of Continental Shale Oil, Daqing, China., Liu Y; Northeast Petroleum University, College of Petroleum Engineering, Daqing, China.; National Key Laboratory of Continental Shale Oil, Daqing, China.
Jazyk: angličtina
Zdroj: PloS one [PLoS One] 2024 Aug 02; Vol. 19 (8), pp. e0303251. Date of Electronic Publication: 2024 Aug 02 (Print Publication: 2024).
DOI: 10.1371/journal.pone.0303251
Abstrakt: Hydraulic fracturing technology is an effective way to develop tight sandstone reservoirs with low porosity and permeability. The tight sandstone reservoir is heterogeneous and the heterogeneity characteristics has an important influence on fracture propagation. To investigate hydraulic fracture performance in heterogeneous tight reservoir, the X-ray diffraction experiments are carried out, the Weibull distribution method and finite element method are applied to establish the uniaxial compression model and the hydraulic fracture propagation model of heterogeneous tight sandstone. Meanwhile, the sensitivity of different heterogeneity characterization factors and the multi-fracture propagation mechanism during hydraulic fracture propagation is analyzed. The results indicate that the pressure transfer in the heterogeneous reservoir is non-uniform, showing a multi-point initiation fracture mode. For different heterogeneity characterization factors, the heterogeneity characteristics based on elastic modulus are the most sensitive. The multi-fracture propagation of heterogeneous tight sandstone reservoir is different from that of homogeneous reservoir, the fracture propagation morphology is more complex. With the increase of stress difference, the fracture propagation length increases. With the increase of injection rate, the fracture propagation length increases. With the increase of cluster spacing, the propagation length of multiple fractures tends to propagate evenly. This study clarifies the influence of heterogeneity on fracture propagation and provides some guidance for fracturing optimization of tight sandstone reservoirs.
Competing Interests: The authors have declared that no competing interests exist.
(Copyright: © 2024 Zhao et al. This is an open access article distributed under the terms of the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited.)
Databáze: MEDLINE
Externí odkaz:
Nepřihlášeným uživatelům se plný text nezobrazuje