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Coupling Study of Fracture Propagation-Filtration-Seepage during Hydraulic Fracturing Assisted Oil Displacement in Offshore Low-Permeability Reservoirs.
ACS Omega
January 2025
Laboratory of Enhanced Oil Recovery of Education Ministry, Northeast Petroleum University, Daqing, Heilongjiang 163318, China.
Offshore low-permeability reservoirs are mainly composed of complex fault-block structures with poor physical properties, which makes establishing an effective displacement relationship particularly challenging. Hydraulic fracturing assisted oil displacement (HFAD) can effectively increase the oil production of a single well by creating fractures to replenish the producing energy. In this study, the Khristianovich-Geertsma-de Klerk (KGD) model is used to calculate the propagation of vertical fractures, and the flow tube method is used to calculate the two-phase oil-water flow in filtration and seepage.
View Article and Find Full Text PDFHigh-resolution investigations of fault architecture in space and time.
Sci Rep
January 2025
Dipartimento di Scienze Biologiche, Geologiche ed Ambientali, Università di Bologna, Bologna, Italy.
Heterogeneous fault architecture affects crustal seismotectonics and fluid migration. When studying it, we commonly rely on static conceptual models that generally overlook the absolute time dimension of fault (re)activation. Heterogenous faults, however, represent the end-result of protracted, cumulative and intricate deformation histories.
View Article and Find Full Text PDFRisk assessment and quality management in AIO based on CT-linac for nasopharyngeal carcinoma: An improved FMEA and FTA approach.
Med Phys
January 2025
State Key Laboratory of Oncology in South China, Guangdong Key Laboratory of Nasopharyngeal Carcinoma Diagnosis and Therapy, Guangdong Provincial Clinical Research Center for Cancer, Sun Yat-sen University Cancer Center, Guangzhou, P. R. China.
Article Synopsis
- AIO radiotherapy integrates all conventional steps into one device, improving efficiency and reducing errors for cancer patients while facing challenges like software complexity and AI reliance.
- A risk assessment using FMEA and FTA was conducted to evaluate the quality management measures for nasopharyngeal carcinoma treatment.
- Results showed 86 failure modes identified, with risk priority numbers indicating varying levels of risk, emphasizing the importance of implementing quality management measures for safety.
On the anatomy of acoustic emission.
J Acoust Soc Am
December 2024
Los Alamos National Laboratory, Los Alamos, New Mexico 87545, USA.
Abrupt, local frictional fault failure comprises a displacement that is normally accompanied by acoustic emission (AE)-an impulsive elastic wave broadcast with an amplitude proportional to particle velocity. The aggregate of these displacements is the basic fault motion. In laboratory shear experiments, the examination of a sequence of laboratory earthquakes includes continuous measurements of fault motion and the associated AE that is broadcast.
View Article and Find Full Text PDFGeneralized Gaussian Distribution Improved Permutation Entropy: A New Measure for Complex Time Series Analysis.
Entropy (Basel)
November 2024
School of Information and Communication, Guilin University of Electronic Technology, Guilin 541004, China.
To enhance the performance of entropy algorithms in analyzing complex time series, generalized Gaussian distribution improved permutation entropy (GGDIPE) and its multiscale variant (MGGDIPE) are proposed in this paper. First, the generalized Gaussian distribution cumulative distribution function is employed for data normalization to enhance the algorithm's applicability across time series with diverse distributions. The algorithm further processes the normalized data using improved permutation entropy, which maintains both the absolute magnitude and temporal correlations of the signals, overcoming the equal value issue found in traditional permutation entropy (PE).
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