Mohammad Ali Aghighi
University of New South Wales
Pore water pressureGeothermal gradientGeologyFinite element methodBoreholePermeability (earth sciences)PoromechanicsGeotechnical engineeringMaterials scienceTight gasHydraulic fracturingFracture treatmentsEnvironmental scienceFracture (geology)CoalMechanicsPetroleum engineeringEffective stressAnisotropyStress (mechanics)Fluid dynamics
26Publications
9H-index
145Citations
Publications 26
Newest
Abstract null null Permeability is arguably the most important parameter in gas pre-drainage and production practices in coal mining and coal seam gas industries. In fractured coal seams, permeability can significantly vary both laterally and vertically. Knowing the vertical variation of permeability in relatively thick coal seams is important in optimizing inseam pre-drainage design in underground coal mining and improving reservoir management and completion design efficiency in the coal seam g...
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#1Adelina Lv (UNSW: University of New South Wales)H-Index: 4
#2Mohammad Ali Aghighi (UNSW: University of New South Wales)H-Index: 9
Last. Hamid Roshan (UNSW: University of New South Wales)H-Index: 24
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The effective stress coefficient (ESC) is a key parameter in the linear poroelastic effective stress formulation. In fluid-bearing porous media, the effective stress is the difference between total stress and a fraction of the pore fluid pressure controlled by the ESC. The ESC is either measured in the laboratory or estimated by empirical models using field data. Among different techniques, sonic velocity measurements are widely used to estimate the ESC. The structure of coal, however, has some ...
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#1Mohammad Ali Aghighi (UNSW: University of New South Wales)H-Index: 9
#2Adelina Lv (UNSW: University of New South Wales)H-Index: 4
Last. Hamid Roshan (UNSW: University of New South Wales)H-Index: 24
view all 3 authors...
Abstract Modelling gas flow in sorptive porous materials (e.g. coal) offers significant challenges compared to that of non-sorptive porous media (e.g. conventional hydrocarbon reservoirs). Sorption processes in the matrix, gas flow in the fractures (cleats) and induced strains in the bulk of coal interact in a coupled manner, affecting the sorption, mechanical and hydraulic characteristics of the media. Despite extensive research on constitutive models that take into account the coupling process...
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#1Mohammad Ali Aghighi (UNSW: University of New South Wales)H-Index: 9
#2Ramin Asgari (UT: University of Tehran)
An important step in borehole stability analysis is to estimate a safe and stable mud weight window. A rock failure criterion is required for this purpose. Mud weight windows define the mud program and the number of casing set points thus improving well control and the economy of the drilling project. The aim of this paper is to derive analytical equations for estimating the values of mud pressure corresponding to low and high mud weight shear failures for various modes of stress state using a m...
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#1Mohammad Ali Aghighi (UQ: University of Queensland)H-Index: 9
#2Raymond L. Johnson (UQ: University of Queensland)H-Index: 15
Last. Christopher R. Leonardi (UQ: University of Queensland)H-Index: 12
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Improved hydraulic fracturing models can better inform operational decisions regarding production from low-permeability coals and ultimately convert currently classified contingent resources to reserves. Improving current modelling approaches requires identification and investigation of the challenges involved in modelling hydraulic fracture stimulation in complex eastern Australian cases where permeability systems and stress regimes can vary significantly. This study investigated differences am...
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#1Hani Asaei (UT: University of Tehran)H-Index: 1
#2Mahdi Moosavi (UT: University of Tehran)H-Index: 16
Last. Mohammad Ali Aghighi (UT: University of Tehran)H-Index: 9
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Abstract When the pore pressure in a porous rock changes, stress arching will occur within the rock and the surrounding region. Stress arching ratio is defined as the total stress changes in the porous rock to the pore pressure change in the region. The region may have the same or different elastic moduli with the surrounding rock, which is usually referred to as inclusion or inhomogeneity. Stress arching is responsible for many geomechanical problems encountered during production or injection; ...
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#1Dariush Javani (IKIU: Imam Khomeini International University)H-Index: 3
#2Bernt S. Aadnøy (University of Stavanger)H-Index: 20
Last. Bijan Maleki (IKIU: Imam Khomeini International University)H-Index: 1
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Abstract Production of fines together with reservoir fluid is called solid production. It varies from a few grams or less per ton of reservoir fluid posing only minor problems, to catastrophic amount possibly leading to erosion and complete filling of the borehole. This paper assesses solid production potential in a carbonate gas reservoir located in the south of Iran. Petrophysical logs obtained from the vertical well were employed to construct mechanical earth model. Then, two failure criteria...
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#1Amin Gholami (UNSW: University of New South Wales)H-Index: 1
#2Mohammad Ali Aghighi (UT: University of Tehran)H-Index: 9
Last. Sheik S. Rahman (UNSW: University of New South Wales)H-Index: 21
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In elastic materials, it is evident that the path of a propagating fracture is deflected from its normal course in presence of imperfections of the material or loading conditions. This paper aims at investigating hydraulic fracture deviation induced by non-uniformity of pore pressure fields with the use of a fully coupled poroelastic model based on the finite element method. The model includes a poroelastic domain in which pressurized hydraulic fractures are explicitly embedded, thus allowing to...
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#1Nader Ghasempour (UT: University of Tehran)
#2Mahdi Moosavi (UT: University of Tehran)H-Index: 16
Last. Mohammad Ali AghighiH-Index: 9
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Borehole collapse is predicted by common rock failure criteria despite they give conservative results due to some simplification of rock behavior. It is the source of many difficulties in implementation of oil well, underground structures and foundations. Utilizing damage theory could improve the conservancy of rock failure criterion. Damage theory considers loss of function rather than loss of strength. Unlike criteria which were derived from plasticity that assume yielding point as the limit o...
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#1P. Adabnezhad (UT: University of Tehran)H-Index: 1
#2Mohammad Ali Aghighi (UT: University of Tehran)H-Index: 9
Last. A. Rostami (Southern California Gas Company)H-Index: 1
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Geomechanical modeling of a reservoir has a very important role in all parts of a field lifecycle. In this paper, we demonstrate a new method for modeling the distribution of elastic properties in the whole reservoir using the concept of geomechanical units (GMUs). In this study, a GMU is a cluster of Young's, Bulk and shear modulus, Poisson's Ratio and unconfined uniaxial strength. To establish these GMUs we used eight wells and the Post-stack seismic data in the field of interest. Dynamic elas...
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