Article
Energy & Fuels
Masoud Hoseinpour, Mohammad Ali Riahi
Summary: This research determined optimal mud weight windows and safe drilling deviation trajectories using geomechanical parameters, proposing a workflow for determining the equivalent mud window. The study found that maximum horizontal stress and Poisson's ratio have the most impact on determining the optimum drilling mud weight windows and safe drilling deviation trajectories.
JOURNAL OF PETROLEUM EXPLORATION AND PRODUCTION TECHNOLOGY
(2022)
Article
Energy & Fuels
Dorcas S. Eyinla, Michael A. Oladunjoye, Abel I. Olayinka, Boris B. Bate
Summary: The study on three wells in the Niger Delta Basin found that as porosity increases, both compressional wave velocity (Vp) and shear wave velocity (Vs) of the rock decrease, and there is a linear correlation between Poisson's ratio and Vp/Vs; furthermore, the acoustic impedance of the materials decreases with increasing porosity, and the depth plot of the impedance shows divergence.
JOURNAL OF PETROLEUM EXPLORATION AND PRODUCTION TECHNOLOGY
(2021)
Article
Materials Science, Multidisciplinary
Naigen Tan, Renshu Yang, Zhuoying Tan
Summary: This paper conducted hydrofracturing tests in seven deep boreholes to investigate the impact of faults on geostress accumulation and orientation shift. The results showed that the degree of stress differentiation and its direction varied according to the fault attribute and its position. However, the magnitude and direction of in-situ stress conformed to the regional tectonic stress at a distance from the faults. This study sheds new light on the fault-induced stress accumulation and orientation shift mechanisms.
INTERNATIONAL JOURNAL OF MINERALS METALLURGY AND MATERIALS
(2023)
Article
Geosciences, Multidisciplinary
Luanxiao Zhao, Jinwan Zhu, Xuan Qin, Gong Rui, Zhenjia Cai, Fengshou Zhang, De-hua Han, Jianhua Geng
Summary: Understanding and modeling the elastic and anisotropic responses of organic shale is crucial for interpreting sonic and seismic data. However, current rock physics modeling of organic shales either ignore or qualitative consider the effects of thermal maturity. This paper presents a quantitatively maturity-constrained rock physics model for shale, which combines organic geochemistry with rock physics modeling. The developed model demonstrates the importance of considering the effects of thermal maturity on the elastic properties of organic shale.
EARTH-SCIENCE REVIEWS
(2023)
Article
Multidisciplinary Sciences
Hanghang Yan, Kaiyun Liu, Chong Xu, Wenbo Zheng
Summary: This paper introduces the Gaussian process regression (GPR) algorithm to make up for the shortcomings of existing intelligent inversion methods. An improved Gaussian process regression (IGPR) algorithm is proposed by adding two single kernel functions. The particle swarm optimization (PSO) is combined with the IGPR model to optimize the parameters. The application case shows that the PSO-IGPR hybrid model based on ARD kernel function has the highest identification accuracy.
SCIENTIFIC REPORTS
(2022)
Article
Energy & Fuels
Yanhui Han
Summary: Accurate in-situ stress information is crucial for deep underground engineering. The existing equations for computing the maximum horizontal stress from borehole breakout need improvement for impermeable and permeable boreholes and formations, as suggested in this technical note.
GEOMECHANICS AND GEOPHYSICS FOR GEO-ENERGY AND GEO-RESOURCES
(2021)
Article
Energy & Fuels
Bin Wang, Daoqing Li, Bin Xu, Yi Zhang, Fengshou Zhang, Quan Wang, Baohong Yang
Summary: Increasing the pressure of underground gas storage is a cost-effective way to enhance its capacity, but geomechanical factors and safety concerns need to be considered. Through comprehensive geomechanical study and risk assessment, it is found that fault slippage is the controlling factor for the maximum operating pressure of a gas storage site. Operating the pressure at the initial level is overly conservative, leading to under-utilization of the storage capability.
GEOMECHANICS FOR ENERGY AND THE ENVIRONMENT
(2022)
Article
Engineering, Geological
Mahsa Sakha, Morteza Nejati, Thomas Driesner
Summary: This paper investigates the problem of hydraulic fracture initiation from an initially notch-free wellbore situated in an anisotropic host rock. The initiation pressure, initiation orientation, and initiation length characterize hydraulic fracture initiation in such conditions. The strength-based criterion captures only two of these parameters, while the evaluation of initiation length requires a mixed criterion approach. The study extends the mixed criterion formulation for isotropic rocks to include anisotropic material behavior and explores the interaction between material anisotropy and stress anisotropy in determining the break-down pressure, starter crack size, and orientation.
INTERNATIONAL JOURNAL OF ROCK MECHANICS AND MINING SCIENCES
(2023)
Article
Energy & Fuels
Sankhajit Saha, Vikram Vishal, Bankim Mahanta, Sarada Prasad Pradhan
Summary: This study presents a geomechanical characterization of the Hugin Formation in the Volve field, focusing on stress state, pore pressure, and rock mechanical properties. The findings can serve as a reference for future field development strategies and feasibility considerations for CO2 sequestration.
GEOMECHANICS AND GEOPHYSICS FOR GEO-ENERGY AND GEO-RESOURCES
(2022)
Article
Engineering, Environmental
Ji-Won Son, Jae-Hwan Choi
Summary: The necessary operating parameters for improving the desorption rate while controlling Faradaic reactions in a membrane capacitive deionization (MCDI) system were studied. The total charge (QT) accumulated in the carbon electrode was found to be the main parameter determining the desorption rate. A model equation for calculating the minimum desorption time required to operate a MCDI system without Faradaic reactions was derived through RC circuit analysis.
Review
Geochemistry & Geophysics
Mingyu Cai, Yuliang Su, Lei Li, Yongmao Hao, Xiaogang Gao
Summary: This review explores the impact of CCUS technologies on carbon emissions in unconventional reservoirs, focusing on the interactions between CO2 and fluids and rocks, as well as the effects of phase behavior, gas-liquid equilibrium, adsorption/desorption, etc., on multiphase flow.
Article
Engineering, Geological
Kang Duan, Xuejian Li, Chung-Yee Kwok, Qiangyong Zhang, Luchao Wang
Summary: A novel physics-based numerical model is proposed to simulate the orientation and effective confining pressure dependent permeability of anisotropic rock. The study reveals that the macro permeability decreases with increasing effective stress, and permeability anisotropy is caused by different apertures and force sensitivity factors assigned to the rock matrix and bedding. The model successfully captures the hydro-mechanical coupled responses of anisotropic rock formation, providing insights into the mechanisms underlying stress-dependent permeability and engineering responses.
INTERNATIONAL JOURNAL OF ROCK MECHANICS AND MINING SCIENCES
(2021)
Article
Engineering, Geological
Nam Hung Tran, Duc Phi Do, Minh Ngoc Vu, Thi Thu Naga Nguyen, Duc Tho Pham, Hung Truong Trieu
Summary: This work aims to investigate the safe mud pressure window of horizontal wellbore drilled in the saturated rock, considering the combined effect of anisotropy and uncertainty. Deterministic solutions are presented to calculate collapse and fracture initiation pressures under different conditions. Sensitivity analysis is conducted to identify key parameters related to anisotropy. Monte Carlo Simulation is utilized to quantify the uncertainty effect. Kriging metamodeling technique is applied to study wellbore stability. The results highlight the importance of considering anisotropy, uncertainty, and hydraulic boundary conditions in wellbore design.
INTERNATIONAL JOURNAL OF ROCK MECHANICS AND MINING SCIENCES
(2022)
Article
Mechanics
Mahsa Sakha, Morteza Nejati, Ali Aminzadeh, Saeid Ghouli, Martin O. Saar, Thomas Driesner
Summary: This study evaluates the accuracy of three fracture growth theories in predicting crack trajectories in anisotropic rocks through comparison with new experimental data. The results show that anisotropy can offset or reinforce the loading influence in determining the direction of crack growth, depending on the loading configurations. It is demonstrated that the modified forms of the maximum tangential stress (MTS) and maximum energy release rate (MERR) criteria give better predictions of fracture growth paths compared to the modified maximum strain energy density (MSED) criterion.
INTERNATIONAL JOURNAL OF SOLIDS AND STRUCTURES
(2022)
Article
Geosciences, Multidisciplinary
Martin Balcewicz, Mirko Siegert, Marcel Gurris, Matthias Ruf, David Krach, Holger Steeb, Erik H. Saenger
Summary: Digital Rock Physics (DRP) has become an integral part of reservoir characterization in the past 30 years due to its non-destructive testing nature. High-resolution X-ray Computed Tomography (XRCT) technology allows for precise imaging of material particles in volume. However, assigning physical properties to specific voxels within the digital twin remains a challenge, requiring a combination of various imaging techniques and geological input properties for optimal spatial segmentation.
FRONTIERS IN EARTH SCIENCE
(2021)
Article
Geosciences, Multidisciplinary
Xinpeng Pan, Guangzhi Zhang, Huaizhen Chen, Xingyao Yin
JOURNAL OF APPLIED GEOPHYSICS
(2017)
Article
Geochemistry & Geophysics
Xinpeng Pan, Guangzhi Zhang, Huaizhen Chen, Xingyao Yin
JOURNAL OF GEOPHYSICS AND ENGINEERING
(2017)
Review
Geochemistry & Geophysics
Xinpeng Pan, Guangzhi Zhang
SURVEYS IN GEOPHYSICS
(2018)
Article
Energy & Fuels
Xinpeng Pan, Guangzhi Zhang, Huaizhen Chen, Xingyao Yin
JOURNAL OF NATURAL GAS SCIENCE AND ENGINEERING
(2018)
Review
Geochemistry & Geophysics
Xinpeng Pan, Guangzhi Zhang, Xingyao Yin
SURVEYS IN GEOPHYSICS
(2018)
Article
Geochemistry & Geophysics
Guangzhi Zhang, Lin Li, Xinpeng Pan, Hengxin Li, Junzhou Liu, Lei Han
Review
Energy & Fuels
Xinpeng Pan, Dazhou Zhang, Pengfei Zhang, Guangzhi Zhang, Yian Cui, Jianxin Liu
JOURNAL OF NATURAL GAS SCIENCE AND ENGINEERING
(2020)