Prediction of Solvent Effect on Asphaltene Precipitation at Reservoir Conditions

The aim of the current study is to evaluate the effects of inhibitors or solvents on asphaltene precipitation under reservoir conditions. To this end, the interaction between live oil and solvent, and its side effects on precipitated/dissolved asphaltene were predicted via Miller’s entropy modified polymer solution theory under reservoir conditions. Then, the adjustable parameters of the model were tuned using experimental the data of asphaltene precipitation within a live oil sample. The obtained adjusted parameters were considered to monitor the effects of solvent injection, miscible gas injection, and natural depletion on asphaltene deposition through an oil sample. Finally, Peng-Robinson equation of state was applied to calculate vapor-liquid equilibrium conditions. The results showed that the output of the model was really in good agreement with all experimental, field, and theoretical data

Modeling of gypsum precipitation in homogeneous and heterogeneous gas reservoirs

© 2017 Elsevier B.V. Water injection into near dew point gas condensate reservoirs is a common method to delay the condensate dropout near the wellbore. Also water can be injected as waste water disposal into the depleted gas reservoirs or to increase the oil recovery in primary enhanced oil recovery process. All of these processes result in mixing of incompatible injection and formation waters which finally causes mineral scale formation. Gypsum is one of the most common mineral scales which is precipitated uring the mixing of incompatible waters in porous media. This scale can reduce the reservoir rock permeability which affects the success of continuous water injection in hydrocarbon reservoirs. The mineral scale formation through the porous media can be determined if the suitable dispersion coefficient is estimated. Dispersion coefficient is already estimated by neglecting the effects of porous media or using unsuitable tracers which might affect the rate of scale precipitation. Two main issues have been investigated in this work. The first one is the development of an experimental method to measure the dispersion coefficient by a proper tracer which has no interaction with the other ions in porous media. The second one is modeling the concentrations of ions in porous media by two approaches. In this study the standard diffusivity equation and the capacitance approach are used to model the concentration profiles for all ions. The results of this work suggest the application of the capacitance model for the heterogeneous rocks and the standard diffusivity model for the homogeneous ones

Surveying the fractions of Mesobuthus Eupeus in Kashan

Background: Mesobuthus eupeus is the most common type of mesobuthus belongs to the buthidae family. It is reported all over Iran and is a common cause of biting. Identifying its fractions could be helpful to draw better therapeutic approach, thus the present study was conducted in Kashan to determine different fractions of mesobuthus eupeus.Materials and Methods: It was a descriptive study. Having prepared Tricine SDS-PAGE and heated the toyin with a buffer containing mercaptoethanol, 25 microgram, of toxin protein was injected to each plate adjusting the electrophoresis on 80V. Following the electrophoresis, 15 hours later, the produced gel was washed and fixed by methanol. Sigma ultra low MW was used to compare molecular weight of toxin protein.Results: Mesobuthus eupeus' toxin contains 6 protein bands. The highest one had the molecular weight of 26.96 KD whereas the lowest band had the molecular weight of 1KD. It has further proteins with lower molecular weight as compared to sigma ultra low MW.Conclusion: Since mesobuthus eupeus could be found all over Iran, further studies are strongly recommended to determine better antivenom

Applying petroleum inclusions micro-thermometry in reconstructing the oil types in Asmari-Jahrum formation Iran

Conference details: 3rd Biennial Conference on Asian Current Research on Fluid Inclusions ACROFI - III and 14th International Conference on Thermobarogeochemistry TBG - XIV, held 15-20 September, 2010, Novosibirsk, Russia.Shariatinia Z., Levresse G., Parnell J., Haghighi M., Feiznia S., Moallemi S.A., Dehghani Mousavi S.A.http://acrofi.igm.nsc.ru

Pulmonary mucormycosis in a patient with chronic rejection of kidney transplant: A case report

Pulmonary mucormycosis is a rare but fatal condition that frequently occurs in immunocompromised patients. Correct diagnosis and rapid start of preferred antifungal treatment need clinical suspicion. Patient�s symptoms may be confluent with other conditions such as bacterial and other fungal infections. We present a case of pulmonary mucormycosis in a patient with end stage renal disease successfully treated with a long course of amphotericin B deoxycholate (AmB) and upper lobectomy of the left lung despite of low pulmonary capacity. © 2015 NRITLD