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simulation of thermo-hydro-mechanical processes at Soultz-sous-Forêts
, Article Energies ; Volume 15, Issue 24 , 2022 ; 19961073 (ISSN) ; Singh, M ; Mahyapour, R ; Tangirala, S. K ; Bär, K ; Sass, I ; Sharif University of Technology
MDPI
2022
Abstract
Porosity and permeability alteration due to the thermo-poro-elastic stress field disturbance from the cold fluid injection is a deciding factor for longer, more economic, and safer heat extraction from an enhanced geothermal system (EGS). In the Soultz-sous-Forêts geothermal system, faulted zones are the main flow paths, and the resulting porosity–permeability development over time due to stress reorientation is more sensitive in comparison with the regions without faulted zones. Available operational and field data are combined through a validated numerical simulation model to examine the mechanical impact on the pressure and temperature evolution. Results shows that near the injection...
Reduction of formation damage in horizontal wellbores by application of nano-enhanced drilling fluids: Experimental and modeling study
, Article Journal of Petroleum Science and Engineering ; Volume 210 , 2022 ; 09204105 (ISSN) ; Ghazanfari, M. H ; Sharif University of Technology
Elsevier B.V
2022
Abstract
One of the basic challenges during drilling horizontal wellbores is the damage induced by invasion of mud filtrate into the formation. Addition of nanoparticles to drilling fluids has been recognized as a measure of control and reduction of filtrate invasion, which is the primary mechanism of the aforementioned formation damage. Despite notable advances in composing Nano-enhanced drilling fluids, the role of nanoparticle hydrophobicity on performance of the fluids has not been well studied. This study is based on a combined experimental-numerical methodology. In the experimental section, a procedure to find the optimum composition of Nano-enhanced water-based samples, containing...
Coupled hydro-mechanical analysis of underground gas storage at Sarajeh field, Qom formation, Iran
, Article Journal of Natural Gas Science and Engineering ; Volume 92 , 2021 ; 18755100 (ISSN) ; Shad, S ; Zivar, D ; Razaghi, N ; Sharif University of Technology
Elsevier B.V
2021
Abstract
Production or injection of fluids from/in an underground storage site causes variations of pore pressure and stress states. These fluctuations significantly affect implications for hydraulic fracturing, wellbore integrity, top surface subsidence and heave, fault-reactivation, and stability of reservoir and caprock. Therefore, in order to keep optimal conditions during the process of gas injection and production, it is of paramount importance to have accurate estimates of the pore pressure. In this investigation, coupled fluid flow and geomechanical simulations, as well as rock mechanical tests, are performed on the Sarajeh field, Iran to investigate the geomechanical behavior of the Sarajeh...
Prediction of waterflood performance using a modified capacitance-resistance model: A proxy with a time-correlated model error
, Article Journal of Petroleum Science and Engineering ; Volume 198 , 2021 ; 09204105 (ISSN) ; Aminshahidy, B ; Bazargan, H ; Sharif University of Technology
Elsevier B.V
2021
Abstract
Capacitance-Resistive Model (CRM), as a fast yet efficient proxy model, suffers from some limitations in modeling relatively complex reservoirs. Some current improvements on this proxy made it a more powerful simulator with updating parameters over time. However, the model's intrinsic uncertainty arisen from simplifying fluid-flow modeling by some limited number of constant parameters is not addressed yet. In this study, this structural limitation of CRM has been addressed by introducing a time-correlated model error, including stochastic and non-stochastic parameters, embedded into this proxy's formulation. The error term's non-stochastic parameters have been tuned to be used in forecasting...
A geomechanical approach to casing collapse prediction in oil and gas wells aided by machine learning
, Article Journal of Petroleum Science and Engineering ; Volume 196 , 2021 ; 09204105 (ISSN) ; Ghorbani, H ; Wood, D. A ; Mehrad, M ; Davoodi, S ; Rashidi, S ; Soleimanian, A ; Shahvand, A. K ; Sharif University of Technology
Elsevier B.V
2021
Abstract
The casing-collapse hazard is one that drilling engineers seek to mitigate with careful well design and operating procedures. However, certain rock formations and their fluid pressure and stress conditions are more prone to casing-collapse risks than others. The Gachsaran Formation in south west Iran, is one such formation, central to oil and gas resource exploration and development in the Zagros region and consisting of complex alternations of anhydrite, marl and salt. The casing-collapse incidents in this formation have resulted over decades in substantial lost production and remedial costs to mitigate the issues surrounding wells with failed casing string. High and vertically-varying...
An innovative workflow for selecting appraisal area in low permeability greenfield development under uncertainties
, Article Journal of Petroleum Science and Engineering ; Volume 206 , 2021 ; 09204105 (ISSN) ; Rafizadeh, M ; Pishvaie, M. R ; Ahmadi, M ; Sharif University of Technology
Elsevier B.V
2021
Abstract
There are uncertainties in both inherent geological properties and IOR/EOR performance parameters of low permeability greenfield reservoirs. Therefore, efforts to reduce uncertainties in the appraisal phase are necessary for the development and production phases. An adequate selection of the appraisal area in the hydrocarbon field is an imperative factor since the results of the appraisal well drilling and IOR/EOR pilot tests will be utilized for the development of the entire field. The major challenge in selecting an appraisal area is the lack of an integrated and systematic approach. In this study, we present a novel systematic and quantitative approach consisting of a better...
New insight into the filtration control of drilling fluids using a graphene-based nanocomposite under static and dynamic conditions
, Article ACS Sustainable Chemistry and Engineering ; Volume 9, Issue 38 , 2021 , Pages 12844-12857 ; 21680485 (ISSN) ; Jamshidi, S ; Hajipour, M ; Sharif University of Technology
American Chemical Society
2021
Abstract
During oil and gas well drilling, the filtration control of bentonite water-based drilling fluids (BT-WBDFs), as an environmentally friendly fluid, is crucial to avoid formation damage and swelling shale problems. One of the most critical problems is undesirable changes in the rheology and filtration properties of the BT-WBDFs because of salt contamination. Herein, the potential of using both graphene oxide (GO) nanosheets and a graphene oxide-polyacrylamide (GO-PAM) nanocomposite is evaluated for controlling the filtration properties, especially in a salty medium. First, GO nanosheets were functionalized, and then the GO-PAM nanocomposite was synthesized using the solution polymerization...
Simulation of wellbore drilling energy saving of nanofluids using an experimental taylor–couette flow system
, Article Journal of Petroleum Exploration and Production ; Volume 11, Issue 7 , 2021 , Pages 2963-2979 ; 21900558 (ISSN) ; Sedaghat, A ; Misbah, B ; Sabati, M ; Vaidyan, K ; Mostafaeipour, A ; Hosseini Dehshiri, S. S ; Almutairi, K ; Issakhov, A ; Oloomi, S. A. A ; Malayer, M. A ; Arockia Dhanraj, J ; Sharif University of Technology
Springer Science and Business Media B.V
2021
Abstract
Power consumption of wellbore drilling in oil and gas exploitations count for 40% of total costs, hence power saving of WBM (water-based mud) by adding different concentrations of Al2O3, TiO2 and SiO2 nanoparticles is investigated here. A high-speed Taylor–Couette system (TCS) was devised to operate at speeds 0–1600 RPM to simulate power consumption of wellbore drilling using nanofluids in laminar to turbulent flow conditions. The TCS control unit uses several sensors to record current, voltage and rotational speed and Arduino microprocessors to process outputs including rheological properties and power consumption. Total power consumption of the TCS was correlated with a second-order...
Application of particle swarm optimization and genetic algorithm for optimization of a southern Iranian oilfield
, Article Journal of Petroleum Exploration and Production ; Volume 11, Issue 4 , 2021 , Pages 1781-1796 ; 21900558 (ISSN) ; Dehghan, A ; Yousefzadeh, R ; Sharif University of Technology
Springer Science and Business Media B.V
2021
Abstract
Optimization of the placement and operational conditions of oil wells plays an important role in the development of the oilfields. Several automatic optimization algorithms have been used by different authors in recent years. However, different optimizers give different results depending on the nature of the problem. In the current study, a comparison between the genetic algorithm and particle swarm optimization algorithms was made to optimize the operational conditions of the injection and production wells and also to optimize the location of the injection wells in a southern Iranian oilfield. The current study was carried out with the principal purpose of evaluating and comparing the...
Applying ultrasonic fields to separate water contained in medium-gravity crude oil emulsions and determining crude oil adhesion coefficients
, Article Ultrasonics Sonochemistry ; Volume 70 , 2021 ; 13504177 (ISSN) ; Wood, D. A ; Jokar, S. M ; Rahimpour, M. R ; Sharif University of Technology
Elsevier B.V
2021
Abstract
Separating produced water is a key part of production processing for most crude oils. It is required for quality reasons, and to avoid unnecessary transportation costs and prevent pipework corrosion rates caused by soluble salts present in the water. A complicating factor is that water is often present in crude oil in the form of emulsions. Experiments were performed to evaluate the performance of ultrasonic fields in demulsifying crude oil emulsions using novel pipe-form equipment. A horn-type piezoelectric ultrasonic transducer with a frequency of 20 kHz and power ranging from 80 W to 1000 W was used for experimental purposes. The influences of the intensity of ultrasonic fields,...
An integrated approach for predicting asphaltenes precipitation and deposition along wellbores
, Article Journal of Petroleum Science and Engineering ; Volume 203 , 2021 ; 09204105 (ISSN) ; Husein, M. M ; Ghotbi, C ; Taghikhani, V ; Dabir, B ; Sharif University of Technology
Elsevier B.V
2021
Abstract
Deposition of asphaltenes upon precipitation is a main flow assurance concern, which propelled the development of various experimental and modeling techniques to accurately predict its occurrence. This work develops an integrated approach combining thermodynamic and deposition modules with a multiphase flow simulator to simultaneously model asphaltenes precipitation and deposition in wellbores. The Peng-Robinson equation of state and the modified Miller-Flory-Huggins theory are used to calculate the thermodynamic properties of the oil and asphaltenes precipitation, respectively. The deposition module is based on conservation laws for asphaltenes transport and is linked to the flow simulator...
Dynamic analysis of mud loss during overbalanced drilling operation: An experimental study
, Article Journal of Petroleum Science and Engineering ; Volume 196 , 2021 ; 09204105 (ISSN) ; Salmanpour, S ; Zamani, H ; Zivar, D ; Sharif University of Technology
Elsevier B.V
2021
Abstract
Mud filtration happens during an overbalanced drilling operation that causes mud invasion into pores and fractures. The productivity of a formation is significantly affected by the invasion of the mud into the near-wellbore area during the mud loss process. A considerable number of studies have evaluated mud filtration statically; however, a few studies have considered the dynamic behavior of a mud loss process during overbalanced drilling, which results in the inadequate prediction of the mud loss volume and inflicted damage to the formation. In this study, a near-wellbore simulation system (NeWSS) was designed to evaluate the dynamic mud loss behavior using dimensionless parameters and...
Pore scale visualization of fluid-fluid and rock-fluid interactions during low-salinity waterflooding in carbonate and sandstone representing micromodels
, Article Journal of Petroleum Science and Engineering ; Volume 198 , 2021 ; 09204105 (ISSN) ; Fatemi, M ; Masihi, M ; Sharif University of Technology
Elsevier B.V
2021
Abstract
Low Salinity Waterflooding (LSWF) has become a popular tertiary injection EOR method recently. Both fluid-fluid and fluid-rock interactions are suggested as the contributing mechanisms on the effectiveness of LSWF. Considering the contradictory remarks in the literature, the dominating mechanisms and necessary conditions for Low Salinity Effect (LSE) varies for different crude oil-brine-rock (CBR) systems. The aim of the present study is to investigate LSE for an oil field in the Middle East that is composed of separate sandstone and limestone layers. Contact angles and Interfacial Tension (IFT) are measured to have more insight on the CBR under investigation. Visual experiments were...
Well Injectivity during CO2Geosequestration: A Review of Hydro-Physical, Chemical, and Geomechanical Effects
, Article Energy and Fuels ; Volume 35, Issue 11 , 2021 , Pages 9240-9267 ; 08870624 (ISSN) ; Bedrikovetsky, P ; Borazjani, S ; Mahani, H ; Sharif University of Technology
American Chemical Society
2021
Abstract
Deep saline aquifers are among the most favorable geological sites for short- and long-term carbon geosequestration. Injection of CO2 into aquifers causes various hydro-physical, chemical, and geomechanical interactions that affect the injectivity of wellbores. Despite the extensive research conducted on carbon capture and storage (CCS), there exists a lack of focus on the concept of injectivity. The present study aims to identify the gaps by reviewing the major factors contributing to CO2 injectivity in deep saline aquifers. Moreover, the existing analytical and numerical mathematical models to estimate maximum sustainable injection pressure and pressure build-up are critically reviewed....
Rheological properties and the micromodel investigation of nanosilica gel-reinforced preformed particle gels developed for improved oil recovery
, Article Journal of Petroleum Science and Engineering ; Volume 192 , 2020 ; Salehi, M. B ; Pahlevani, H ; Taghikhani, V ; Sharif University of Technology
Elsevier B.V
2020
Abstract
Preformed particle gels (PPGs) in solutions have been widely used to suppress excess water production in mature oil reservoirs and, in turn, to improve the amount of oil recovery in brown oil fields. In this study, PPG solutions were meticulously formulated and synthesized in order to be utilized in harsh environments in terms of pressure, temperature, pH, and salinity from a free radical polymerization process. In this work, nanosilica gel at different weight percentages was added to improve the mechanical and thermal stability properties of the PPG at harsh condition: high pressure, temperature, and strain. Moreover, the effects of nanosilica gel at various concentrations, ranging from 0.0...
Adaptive neuro-fuzzy algorithm applied to predict and control multi-phase flow rates through wellhead chokes
, Article Flow Measurement and Instrumentation ; Volume 76 , 2020 ; Wood, D. A ; Mohamadian, N ; Rashidi, S ; Davoodi, S ; Soleimanian, A ; Kiani Shahvand, A ; Mehrad, M ; Sharif University of Technology
Elsevier Ltd
2020
Abstract
A Takagi-Sugeno adaptive neuro-fuzzy inference system (TSFIS) model is developed and applied to a dataset of wellhead flow-test data for the Resalat oil field located offshore southern Iran, the objective is to assist in the prediction and control of multi-phase flow rates of oil and gas through the wellhead chokes. For this purpose, 182 test data points (Appendix 1) related to the Resalat field are evaluated. In order to predict production flow rate (QL) expressed as stock-tank barrels per day (STB/D), this dataset includes four selected input variables: upstream pressure (Pwh); wellhead choke sizes (D64); gas to liquid ratio (GLR); and, base solids and water including some water-soluble...
A new multiphase and dynamic asphaltene deposition tool (MAD-ADEPT) to predict the deposition of asphaltene particles on tubing wall
, Article Journal of Petroleum Science and Engineering ; Volume 195 , 2020 ; Jamshidi, S ; Taghikhani, V ; Sharif University of Technology
Elsevier B.V
2020
Abstract
As expounded, the precipitation and deposition of asphaltene particles in pipelines has been proved to be the most challenging flow assurance problem due to its unknown and complex behaviors. In this work, a new multicomponent, multiphase and dynamic tool was developed to model the aggregation and deposition of asphaltene particles in a bulk medium. The multiphase and dynamic asphaltene deposition tool, shortened as MAD-ADEPT is, in fact, a modified version of the previously developed ADEPT. The new tool was developed to make the asphaltene deposition and aggregation concepts in oil production wells more predictable. To tackle the complexity of the asphaltene problem, a bespoke algorithm was...
Fractal analysis of asphaltene aggregation phenomena in live oils at elevated pressure and temperature
, Article Particulate Science and Technology ; Volume 38, Issue 4 , 2020 , Pages 454-463 ; Rashidi, F ; Mousavi Dehghani, S. A ; Ghazanfari, M. H ; Sharif University of Technology
Taylor and Francis Inc
2020
Abstract
In this work, high-pressure microscopy technique was used to measure the size and fractal dimension of asphaltene aggregates formed in different live oil samples at elevated pressures and temperatures. It was found that the asphaltene aggregates in live oil samples are irregular fractal-like structures with pressure−temperature-dependent fractal dimensions. By monitoring the variation of the fractal dimension and size of the asphaltene aggregates with pressure and temperature, the mechanisms responsible for asphaltene aggregation process at elevated pressures and temperatures can be well predicted. The range of fractal dimension of asphaltene aggregates in live oils is similar to that...
Prediction of waterflood performance using a modified capacitance-resistance model: A proxy with a time-correlated model error
, Article Journal of Petroleum Science and Engineering ; Volume 198 , March , 2020 ; Aminshahidy, B ; Bazargan, H ; Sharif University of Technology
Elsevier B. V
2020
Abstract
Capacitance-Resistive Model (CRM), as a fast yet efficient proxy model, suffers from some limitations in modeling relatively complex reservoirs. Some current improvements on this proxy made it a more powerful simulator with updating parameters over time. However, the model's intrinsic uncertainty arisen from simplifying fluid-flow modeling by some limited number of constant parameters is not addressed yet. In this study, this structural limitation of CRM has been addressed by introducing a time-correlated model error, including stochastic and non-stochastic parameters, embedded into this proxy's formulation. The error term's non-stochastic parameters have been tuned to be used in forecasting...
A reactive transport approach for modeling scale formation and deposition in water injection wells
, Article Journal of Petroleum Science and Engineering ; Volume 190 , 2020 ; Sisakhti, H ; Sheikhi, S ; Barzegar, F ; Sharif University of Technology
Elsevier B.V
2020
Abstract
Petroleum industry is moving toward enhancing oil recovery methods, especially water-based methods, including low salinity and smart water flooding which water with an optimized composition is injected into the reservoir for improving oil recovery. Injection of water into the target formation is also a common operation in geothermal energy production. As the water is being injected into the reservoir, pressure and temperature change along the well column and cause scale formation. Mineral scale precipitation and deposition is a common problem for water injection wells which reduces the effective radius of the wellbore and affects the injection efficiency. In this paper, modeling scale...