Catalytic heavy oil upgrading by steam injection with using of transition metals catalysts

UDK: 622.276
DOI: 10.24887/0028-2448-2017-8-30-34
Key words: steam injection, aquathermolysis, heavy oil, in-situ conversion, catalyst, nickel
Authors: S.I. Kudryashov, I.S. Afanasiev, O.V. Petrashov (Zarubezhneft JSC, RF, Moscow), A.V. Vakhin, S.A. Sitnov, A.A. Akhmadiayrov, M.A. Varfolomeev, D.K. Nurgaliev (Kazan (Volga Region) Federal University, RF, Kazan)

The use of oil soluble catalyst precursors based on transition metals (iron, cobalt, nickel, and copper) was studied in order to improve the efficiency of oil production by steam injection technology. Experiments of steam impact on heavy oil with additives of catalyst precursors (0.2 % by metal) were carried out in an autoclave at temperatures 250 and 300 °C for 6 h and a pressure of 9 MPa corresponding to the reservoir data. To assess the efficiency of catalysts the composition and structure of heavy oil was characterized before and after steam impact by SARA analysis, elemental analysis, gas chromatography-mass spectrometry and MALDI mass spectrometry methods. It is established that the use of catalysts, the active form of which is formed in-situ, provides a reduction of heavy components fraction, as well as reduction of average molecular weight of oil. In addition, the simultaneous usage of catalysts with hydrogen donors can increase the H/C ratio. Nickel-based catalyst was the most suitable among the transition metals studied. Its application together with steam injection allows to reduce the heavy oil viscosity in laboratory conditions. The obtained results show that the use of a cyclic system injection together with aquathermolysis catalysts allows to carry out heavy oil upgrading in reservoir conditions, improve rheological properties of heavy oil and, as a result, increase the current production rate of wells.


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