Article
Energy & Fuels
Nian Peng, Tianshou Ma, Ping Chen, Yang Liu
Summary: Formation Testing While Drilling (FTWD) has made significant progress in evaluating pore pressure in geo-energy exploitation. However, with the increasing number of unconventional reservoirs, challenges arise due to supercharging near boreholes. A new mathematical model is proposed to consider supercharging effects, with results showing significant impact on pressure response when formation permeability is less than 5 mD. The proposed method for evaluating original pore pressure under supercharged conditions is more accurate and time-saving compared to conventional methods.
JOURNAL OF PETROLEUM SCIENCE AND ENGINEERING
(2021)
Article
Environmental Sciences
Yingjie Li, Samuel V. J. Robinson, Lan H. Nguyen, Jianguo Liu
Summary: The increasing frequency and severity of coastal hypoxia pose a significant threat to marine ecosystems and human well-being. It is crucial to implement continuous and comprehensive monitoring using advanced tools to track spatial and temporal changes in coastal hypoxia. This study utilized satellite imagery and statistical modeling techniques to estimate the spatiotemporal dynamics of hypoxia in the Gulf of Mexico. The results revealed the influence of surface water processes on bottom water hypoxia, highlighting the need for considering time lags in hypoxia studies. Additionally, the study demonstrated the potential of satellite remote sensing for accurate and real-time hypoxia mapping.
REMOTE SENSING OF ENVIRONMENT
(2023)
Article
Engineering, Chemical
Hu Yin, Hongwei Cui, Jiajia Gao
Summary: A mechanical specific energy (MSE)-based method is proposed to detect pore pressure in deep, complex intervals. The method calculates the energy consumed by the bit to break and remove rock, reflecting the effective stress and pore pressure. Experimental results show that this method can accurately estimate pore pressure.
Article
Multidisciplinary Sciences
Ahmed Abdelaal, Salaheldin Elkatatny, Abdulazeez Abdulraheem
Summary: Two models were developed using artificial neural networks and adaptive neuro-fuzzy inference system to estimate formation pressure gradient in real-time through drilling data. The models showed good accuracy in predicting pressure gradient, proving their reliability.
SCIENTIFIC REPORTS
(2022)
Article
Engineering, Environmental
Jeroen van Eldert, Johan Funehag, David Saiang, Hakan Schunnesson
Summary: Measurement while drilling (MWD) data was used in a study to predict rock mass conditions in tunnels, and correlation analysis was conducted using multilinear regression and the Levenberg-Marquardt method. Although a strong numerical correlation could not be obtained, the results were still promising. Furthermore, a holistic visual approach linking MWD parameters with rock mass classification and support requirements was developed.
BULLETIN OF ENGINEERING GEOLOGY AND THE ENVIRONMENT
(2021)
Article
Chemistry, Multidisciplinary
Ahmed Abdelaal, Salaheldin Elkatatny, Abdulazeez Abdulraheem
Summary: This study developed three models using support vector machines, functional networks, and random forest to predict real-time pore pressure gradient using mechanical and hydraulic drilling parameters. The models exhibited high accuracy in both training and testing, with the random forest model outperforming the others.
Article
Geosciences, Multidisciplinary
Sharon Cornelius, Peter A. Emmet
Summary: Previous research on the central Gulf of Mexico and western Gulf of Mexico revealed differences in geopressure and geothermal distributions. Disequilibrium compaction is a major contributor to overpressure, and the presence of fractures in geothermally warmer and underpressured regions is evident.
Article
Energy & Fuels
Andrzej T. Tunkiel, Dan Sui, Tomasz Wiktorski
Summary: The adoption of machine learning in drilling is hindered by the need to train models on specific well data. To address this issue, a continuous learning method using neural networks to model dynamic behavior is proposed, presenting promising results in accurately predicting drilling data while drilling is ongoing.
JOURNAL OF PETROLEUM SCIENCE AND ENGINEERING
(2021)
Article
Geosciences, Multidisciplinary
Ahmed A. Kassem, Souvik Sen, Ahmed E. Radwan, Wael K. Abdelghany, Mohamed Abioui
Summary: This study aimed to understand the behavior of the Nezzazat and Nubia sandstone reservoirs in response to production-induced depletion and fluid injection for enhanced hydrocarbon recoveries. Through modeling pore pressure, vertical stress and minimum horizontal stress magnitudes, the study determined pressure drop in the reservoirs and proposed mud weight windows for drilling optimization. The research also evaluated reservoir stability during pressurization and assessed the maximum allowable pressure build-up during injection to ensure geomechanical stability.
NATURAL RESOURCES RESEARCH
(2021)
Article
Geochemistry & Geophysics
Nazanin Jahani, Carlos Torres-Verdin, Junsheng Hou
Summary: This study investigates the detectability and sensitivity of deep-sensing borehole electromagnetic measurements for electrically anisotropic rock formations surrounding the well trajectory. The results show that commercially available tri-axial deep-sensing electromagnetic instruments can detect targets within a certain distance range, and the detection distance and radial detection distance are influenced by factors such as geological environment and measurement acquisition parameters.
GEOPHYSICAL PROSPECTING
(2023)
Article
Engineering, Geological
Mohammad Reza Delavar, Ahmad Ramezanzadeh
Summary: Precise pore pressure estimation is of high significance in drilling and development operations. In this study, a hybrid machine learning approach was proposed for fast and reliable formation pressure estimation in carbonate reservoirs. The results showed that the proposed method outperformed other hybrid approaches and introduced highly effective features for pore pressure prediction.
ROCK MECHANICS AND ROCK ENGINEERING
(2023)
Article
Engineering, Geological
Mingfeng Lei, Jin Li, Chenyang Zhao, Chenghua Shi, Weichao Yang, E. Deng
Summary: The study suggests that taking into account 3D effects and soil cohesion can lead to a significant decrease in active earth pressure, while considering cracks and seismic effects has the opposite effect.
SOIL DYNAMICS AND EARTHQUAKE ENGINEERING
(2021)
Article
Engineering, Geological
Einar John Lande, Stefan Ritter, Henning Tyvold, Steinar Nordal
Summary: Overburden drilling can cause ground settlements and a loss of soil volume, requiring further understanding of its mechanisms. Water flushing tests showed a relationship between flow and penetration rate on surrounding ground. Air flushing tests were limited, leading to reduced pore pressure and increased ground movements.
CANADIAN GEOTECHNICAL JOURNAL
(2021)
Article
Engineering, Marine
Junwei Liu, Shuiyue Chen, Xin Li, Zuodong Liang
Summary: This study investigates the fluid-seabed-structure interactions around an open-ended pile using a solver established on the open-source CFD platform and Biot's poro-elastic theory. The analysis reveals that the wave period, degree of seabed saturation, and pile diameter significantly affect the development of transient seabed liquefaction depth around the pile. Additionally, the distribution of pore water pressure vs soil depth in the inner zone of the pile presents a V shape rotated 90 degrees counterclockwise.
JOURNAL OF MARINE SCIENCE AND ENGINEERING
(2021)
Article
Energy & Fuels
Hao Wang, Enyuan Wang, Zhonghui Li, Rongxi Shen, Xiaofei Liu
Summary: The new model has good reliability and applicability by comparing theoretical gas pressure values with actual values. The wide distribution range of gas pressure values indicates the non-uniformity of gas occurrence in the coal seam. The evolution law of outburst elimination in each area of the coal seam also presents non-uniform characteristics influenced by the occurrence of original gas.