Azmi, G. E., attiamahmoud attia, and E. M. E. - M. Shokir, "Exploring The Dominant Factors of Chemical Adsorption in Enhanced Oil Recovery: An Analytical investigation", Egypt. J. Chem. , vol. Vol. 66, issue 13, pp. 569-580, 2023.
Taha, M. A., E. Shokier, A. Attia, A. Yahia, K. Mansour, and D. M. Abdelkhalek, " Eissa Mohamed Shokir Enhancing Condensate Production by 29%, Through Thermal Gas Injection from a Retrograde Gas Condensate Reservoir-With an Operational Case Study in the Western Desert of Egypt", SPE Improved Oil Recovery Conference, 4-2024.
Taha, M., E. Shokir, A. Attia, A. Yahia, and K. Mansour, Enhancing Hydrocarbon Production Through Thermal Gas Injection from a Retrograde as Condensate Reservoir in the Western Desert in Egypt, , Dubai, UAE, September 2021, SPE Annual Technical Conference and Exhibition, SPE-206190-MS, 2021/09/15. Abstract

In retrograde gas condensate reservoirs, condensate blockage is a major reservoir damage problem, where liquid is dropped-out of natural gas, below dew-point pressure. Despite that most of this liquid will not produce due to not reaching the critical saturation, natural gas will be blocked by the accumulated liquid and will also not produce.This work investigates the effects of gas injection (such as methane, carbon-dioxide, and nitrogen) and steam at high temperatures on one of the Egyptian retrograde gas condensate reservoirs. Several gas injection scenarios that comprise different combination of gas injection temperature, enthalpy, injection gas types (CO2, N2, and CH4), and injection-rates were carried out.
The results indicated that all conventional and thermal gas injection scenarios do not increase the cumulative gas production more than the depletion case. The non-thermal gas injection scenarios increased the cumulative condensate production by 8.6%. However, thermal CO2 injection increased the condensate production cumulative by 28.9%.
It was observed that thermal gas injection does not vaporize condensate It was observed that thermal gas injection does not vaporize condensate more than conventional injection that have the same reservoir pressure trend. However, thermal injection mainly improves the condensate mobility. Appropriately, thermal injection in retrograde reservoirs, is mostly applicable for depleted reservoirs when the largest amount of non-producible liquid is already dropped out. Finally, this research studied executing thermal gas injection in retrograde gas condensate reservoirs, operationally, by considering the following items: carbon dioxide recovery unit, compressors, storage-tanks, anti-corrosion pipe-lines and tubing-strings, and corrosion-inhibitors along with downhole gas heaters.

Dmour, H. N., and E. M. Shokir, "Pre-Post Frac Test Data Analysis For Hydraulically Fractured Vertical Tight Gas Well-Field Case Study", Oil and Gas Business Journal, Russia, 2008. Abstract
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Shokir, E. M. E. - M., E. S. Al-Homadhi, O. Al-Mahdy, and A. A. - H. El-Midany, "Development of artificial neural network models for supercritical fluid solvency in presence of co-solvents", Korean Journal of Chemical Engineering, vol. 31: Springer US, pp. 1496–1504, 2014. Abstract
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Al-Khudafi, A. M., E. E. - M. M. Shokir, K. A. Abdel-Fattah, and A. Kadi, "Neuro-fuzzy Inference System for Modeling Equilibrium Ratio for Heptanes-plus Fraction", International Journal of Innovation and Applied Studies, vol. 4, no. 2, pp. 334–342, 2013. Abstract
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Shokir, E. M., H. M. Goda, K. A. Fattah, and M. H. Sayyouh, "Modeling approach for predicting PVT data", Engineering Journal of the University of Qatar, vol. 17, pp. 11–28, 2004. Abstract
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Abdulwarith, A., E. Shokir, and A. - S. Dahab, "Enhancement of Water-Based Mud Rheology and Lubricity Using Silica Nanoparticles", Petroleum and Coal, vol. 62 , issue 4, pp. 1427 - 1434, 2020/11/13. Abstract

Nanotechnology has been widely used in the oil and gas sector in recent years, which has shown successful results at various stages of the oil field, such as exploration, drilling, completion, production, refining, and processing. In particular, the application of nanoparticles to enhance the properties of drilling fluids. The effect of the addition of silica nanoparticles to water-based mud on the properties of rheology, filtration, alkalinity, and lubrication was studied in this paper. Experimentally, different samples of water-based mud were formulated with different SiO2 and MWCNT concentrations (10 nm in size) and tested with Modular Compact Rheometer (MCR), MCR tribometer, API filter press and pH meter for rheological, friction factor, filtration and alkalinity measurements, respectively. The rheo-logical results showed an increase of the yield point by 20.1% at 0.013 wt% of SiO2 and a decrease of the plastic viscosity by 14%. However, the lubricity results showed the highest reduction of the friction factor at 0.013 wt% of SiO2 by 25% and by. Furthermore, the pH results showed a decrease in pH due to the addition of SiO2 and a slight increase in filter loss. Finally, the addition of silica nanoparticles to the water-based mud showed a significant improvement in the rheological properties that help to solve hole cleaning problems. In addition to the lubrication enhancement by reducing the friction factor, which reduces the torque and drag problems during drilling, in particular at deviated wells and therefore increases the drilled length.

Azmi, G. E., A. M. Saada, E. M. Shokir, M. S. El-Deab, A. M. Attia, and W. A. E. Omar, "Adsorption of the Xanthan Gum Polymer and Sodium Dodecylbenzenesulfonate Surfactant in Sandstone Reservoirs: Experimental and Density Function Theory Studies", ACS omega, vol. 7, no. 42: American Chemical Society, pp. 37237–37247, 2022. Abstract
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Shokir, E. M. E. - M., and A. E. - S. B. Ibrahim, "Undersaturated oil viscosity based on multi-gene genetic programming", Journal of Energy Resources Technology, vol. 145, no. 3: American Society of Mechanical Engineers, pp. 033003, 2023. Abstract
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