Journal of Oil, Gas and Petrochemical Technology
سال هشتم شماره 2 (Summer and Autumn 2021)

The magnetic field (MF) affects the corrosion rate of N-80 carbon steel (which is frequently used in petroleum industry) in 3.8 Molar (or 12.5% weight percent). HCl was studied first at different conditions by implementing the potentiodynamic polarization (PDP) and gravimetric weight loss (WL) procedures. Response Surface Methodology (RSM) was next implemented to investigate and simulate the impacts of intensity of the magnetic field, time of magnetization, and elapsed time on the efficiency of corrosion inhibition (η). The test results revealed that acid magnetization considerebly decreases the rate of corrosion of N-80 carbon steel (CS) in the presence of HCl up to 93% so that it can be used as an eco-friendly and cost-effective substitute for the common corrosion inhibitors. The results also revealed that η enhances by enhancing the intensity of magnetic field. The morphology of the N-80 CS surface was also studied using SEM in the magnetized and normal HCl solutions.

In order to address some pressing oil industry problems, particularly exploration problems such as drill misses, erroneous forecast in Field Development Plans (FDP’s) etc., a case study was carried out in K-Creek oil field located in the Central swamp depositional belt of the Niger Delta Basin. Both qualitative and quantitative reservoir characterization methods were deployed. A series of well logs that consists of gamma ray, resistivity, sonic, neutron, and density, 3D seismic, and checkshot data were used to analyze and evaluate the rock and petrophysical properties of the K-Creek field. The effective porosity across the reservoirs ranged from 3% to 32.68% in the Sands A to L. The permeability of the reservoir units ranged from 375.21 to 2108.74mD which implies that the permeability varies from very good to excellent. Water saturation estimated from the reservoir sands ranged from 12.91% to 81.99% in Sand A to L, while the hydrocarbon saturation of the reservoirs was 18.01% to 87.09%. Three synthetic listric faults namely F1, F2 and F3 were interpreted across the inlines intercepting the top of the reservoir Sands A to L. The trapping mechanism is fault trapping. The overall analyses besides the results of the porosity, fluid saturation and permeability values in this study proved that the hydrocarbon reservoirs in K-Creek field are economically viable for the hydrocarbon production.

In this study a hollow fiber membrane contactor system with co-current flow configuration was proposed. Two different hollow fiber membranes made of Polyethersulfone (PES) and Polycarbonate (PC) were produced and their humidification performance for use in air conditioning systems was investigated. For different inlet air dry bulb temperature (25°C, 30°C, 35°C) and relative humidity (20%, 30%, and 40%), the behavior of the membrane system was experimentally studied. The effect of various inlet conditions on the outlet air dry bulb temperature, water vapor flux and cooling capacity of the system for two different hollow fiber membranes were studied. The results showed that the outlet air temperature, water vapor flux and maximum cooling capacity of PES membranes were about 19 °C, 0.007 mol/m2.s and 1.2 W, respectively which is higher than PC membranes because of its higher surface porosity and having superior membrane structure. The final outcome of the experiments further showed that by increasing the entrance air temperature at constant air relative humidity, water vapor flux increased.

In the gas condensate reservoirs, the trapping phenomenon is caused by the capillary force of the rocks. The force that leads to remaining liquids in pores. There are various methods to eliminate the condensate or reduce it to a minimum value. Many researchers attempt to recover more oil commercially and delay leaving gas condensate fields by innovating some new methods such as nanotechnology. The main goal of this study is the reduction of the trapped condensate by applying CaCO3 nanofluid injection (the natural CaCO3 (Bio-Ca) nanoparticles containing chitin) in the sand pack. This is known as an economical and eco-friendly nanoparticle in tertiary enhanced oil recovery method. Finally, the displacement efficiency (ED) and recovery factor (Re) of this nanoparticle was 5.23% and 69.29%, respectively. The optimum values of the initial condensate saturation (Soi) and the flow rate of nanofluid injection (qNF) are 30 and 5cc/min, respectively. These values are the minimum Soi and qNF, which considered in this study

In this paper, a coupled fluid flow-geomechanical simulation in a deformable porous medium using finite element numerical method is presented. This model includes solving conservation of mass and momentum balance equations for solid framework and fluid phases. These equations are based on the Biot consolidation theory. Fluid pore pressure and solid-phase displacement have been selected as the primary variables in these equations. The governing equations are discretized using finite element method. The final equation system is then solved in a fully coupled process which was conducted by using MATLAB software. In this process, convergence and stability of results are guaranteed. Then, Mendel’s problem is solved using a proposed model and the results are compared with the analytical solution of the problem. The proposed model shows a very good agreement with the analytical solution, which indicates the accuracy of the model proposed in this article. Finally, this model is used to simulate the discharge of water from a sand column with a two phase saturation approach. The main priority of this study is providing precise formulations, applicability, and the ability of finite element in modeling coupled fluid flow and deformation in a porous medium.

In the present study, performance of three catalysts containing Y, ZSM-5 and Beta zeolite in the catalytic cracking of a kind of middle distillate cut named ”RCD” has been studied. The catalysts were characterized by XRD, FTIR, SEM, N2 adsorption/ desorption and NH3-TPD techniques. Furthermore, deactivated catalysts in terms of type and amount of deposited coke were analysed. Results of catalytic tests showed that Y zeolite performed better and it decreased viscosity and density of liquid product by 35% and 3% respectively. This good operating was due to the high surface area (812m2/gr) and higher acidic sites amounts(1.8 mmol NH3/gr) which gives the heavy molecules better accesibility to active acid sites .But more cokes have deposited on Y zeolite which was 50% lower for Beta and ZSM-5 zeolites. Finally, it can be concluded that the ultimate performance of catalysts in catalytic cracking is influenced by the synergetic effects between the pore structure and acidity.