Applicability of Express Methods of Determination of Efficiency of Solvents for Recovery of Heavy Oil from Carbonate Reservoirs

Foss, L. E.; Borisov, D. N.; Yakubov, M. R.

doi:10.1007/s10553-019-01068-8

Cited by 1 publication

(2 citation statements)

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“…To improve the steam injection technology, as well as to reduce steam consumption and increase oil production, more efficient technology is being implemented, in which a solvent is injected together with steam. 12,13 The use of solvents from lowboiling aliphatic hydrocarbons can lead to coagulation of asphaltenes and clogging of the pores of oily rocks, which may result in decreasing the displacement efficiency. However, aromatic hydrocarbons such as toluene, xylene, etc.…”

Section: Introductionmentioning

confidence: 99%

“…Enhancing heavy oil conversion during thermal steam injection involves a change in some characteristics of oil, leading to a positive effect on its extraction, transportation, preparation, and processing. − Enhancing and upgrading heavy oils and bitumen requires new and comprehensive methods to take advantage of, for example, the benefits of heat and the efficiency of hydrocarbon solvent injection. To improve the steam injection technology, as well as to reduce steam consumption and increase oil production, more efficient technology is being implemented, in which a solvent is injected together with steam. , The use of solvents from low-boiling aliphatic hydrocarbons can lead to coagulation of asphaltenes and clogging of the pores of oily rocks, which may result in decreasing the displacement efficiency. However, aromatic hydrocarbons such as toluene, xylene, etc.…”

Section: Introductionmentioning

confidence: 99%

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Application of Aromatic and Industrial Solvents for Enhancing Heavy Oil Recovery from the Ashalcha Field

et al. 2020

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Nowadays, there is a significant increase in the share of unconventional oil reserves such as heavy and extra-heavy oils as well as natural bitumen among the total balance of extracted petroleum feedstock. In this regard, one of the most important problems is to ensure their rational production and processing and satisfaction of the increasing consumption of energy resources. This paper investigates the effect of various solvents on the upgrading of heavy oil from the Ashalcha field under thermal steam injection by means of aromatic and industrial solvents. The results suggest that the largest amount of gases is released when benzene is added to the oil from aromatic solvents (500 g/t of oil). The results of viscosity dependence on temperature and component composition showed that oil has the lowest viscosity with the addition of toluene compared to the viscosity of the original oil and the control experiment samples, whose viscosities decrease by 4 and 3.5 times, respectively, at 10 °C. The changes in the chemical group composition, especially the significant decrease of resin content in the presence of all solvents (toluene, benzene, their mixture 1:1, as well as Solvesso-150), are explained by the destruction of associated complexes of resin molecules, thereby affecting a decrease in oil viscosity. The calculation of the indices of colloidal instability showed that the control experiment oil has the lowest stability due to the high value of CII. IR spectral data have established that a significant difference between spectra of all oils is the absence of absorption bands at 1710 cm −1 , which corresponds to the vibrations of CO carbonyl groups. The use of solvents for thermal steam exposure helps to ensure a high level of energy efficiency during the application of thermal steam exposure to heavy oil and natural bitumen deposits.

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Section: Introductionmentioning

confidence: 99%