A review of in situ upgrading technology for heavy crude oil

Abstract

With the growing demand of oil worldwide, heavy oil has increasingly become vital in the world energy market. However, further development of heavy oil reservoirs are limited by regular enhanced oil recovery (EOR) methods. In situ upgrading technology provides potential for the development of heavy oil and bitumen reservoirs. This study reviews three categories of in situ upgrading methods: solvent-based, in situ combustion (ISC), and catalytic. Solvent-based methods, including cyclic solvent injection, vapor extraction, and hybrid processes, have recently received attention and have been progressed in both laboratory and field applications. However, high solvent costs in relation to the low price of heavy oil have continued to limit the field applications of these techniques. ISC, which may have the potential to develop particularly harsh reservoirs with extremely viscous crude oil, involves complex reaction mechanisms and consists of three main steps: oxidation, combustion, and gas flooding. Yet, complex operating conditions and a low success rate have restricted its application. Catalytic methods, which have demonstrated the potential to refine and upgrade crude oil in a more economic and environmentally friendly way, are often accompanied by conventional thermal EOR methods, such as steam flooding and ISC, and involve a series of hydroprocessing or hydrotreating reactions, such as hydrocracking, hydrodesulfurization, hydrodenitrogenation, hydrodeoxygenation, and hydrodemetallization. However, the high cost and complexity of the reaction mechanisms have limited their applications.

Keywords

In situ upgrading / Heavy oil / Bitumen / In situ combustion / Catalytic / Solvent

Declaration of competing interest

The authors declare that they have no conflict of interests.

Acknowledgements

This work was supported by the National Natural Science Foundation of China (Grant No: 51704245) and PetroChina Innovation Foundation (2019D-5007-0212).

References

[1] O. Secretariat,World Oil Outlook, 2016. M. Vienna, Austria.

[2] R.F. Meyer, E.D. Attanasi, Heavy oil and natural bitumendstrategic petroleum resources, Z. World 434 (2003) 650-657.

[3] X. Zhang, Q. Liu, Z. Fan, Y. Liu, Enhanced heavy oil recovery and performance by application of catalytic in-situ combustion, J. Pet. Sci. Technol. 37 (5) (2019) 493-499, http://dx.doi.org/10.1080/10916466.2018.1482333.

[4] A. Shah, R. Fishwick, J. Wood, G. Leeke, S. Rigby, M. Greaves, A review of noveltechniques for heavy oil and bitumen extraction and upgrading, J. Energy Environ. Sci. 3 (6) (2010) 700-714, http://dx.doi.org/10.1039/b918960b.

[5] A. Turta,Chapter 18-in situ combustion, M. Enhanced Oil Recovery Field Case Studies (2013) 447-541.

[6] P.P. Almao, In situ upgrading of bitumen and heavy oils via nanocatalysis, J. Can. J. Chem. Eng. 90 (2) (2012) 320-329.

[7] P. Luo, C. Yang, A. Tharanivasan, Y. Gu, In situ upgrading of heavy oil in a solvent-based heavy oil recovery process, J. J. Can. Pet. Technol. 46 (9) (2008) 37-43.

[8] M. Mahasneh, Toe-to-Heel air injection in-situ combustion process: case study from the azraq basin, Jordan, J. Rudarsko-geolosko-naftni zbornik 35 (3) (2020).

[9] S. Upreti, A. Lohi, R. Kapadia, R. El-Haj, Vapor extraction of heavy oil and bitumen: a review, J. Energy Fuels 21 (3) (2007) 1562-1574, http://dx.doi.org/10.1021/ef060341j.

[10] I. Mokrys, R. Butler, In-situ Upgrading of Heavy Oils and Bitumen by Propane Deasphalting: the VAPEX Process, C. SPE Production Operations Symposium, Society of Petroleum Engineers, 1993.

[11] J. Allen, Gaseous Solvent Heavy Oil Recovery, P. Canadian Patent, 1975, 01.

[12] J.C. Allen, D.A. Redford, Combination Solvent-Noncondensible Gas Injection Method for Recovering Petroleum from Viscous Petroleum-Containing Formations Including Tar Sand Deposits, P. Google Patents, 1978.

[13] J.C. Allen, C.D. Woodward, A. Brown, C.H. Wu, Multiple Solvent Heavy Oil Recovery Method, P. Google Patents, 1976.

[14] D.A. Redford, M.R. Hanna, Gaseous and Solvent Additives for Steam Injection for Thermal Recovery of Bitumen from Tar Sands, P. Google Patents, 1981.

[15] I.J. Mokrys, R.M. Butler, The rise of interfering solvent chambers: solvent analog model of steam-assisted gravity drainage, J. J. Can. Pet. Technol. 32 (3) (1993) 26-36, http://dx.doi.org/10.2118/93-03-02.

[16] A. Ahadi, F. Torabi, A. Abedini, Role of Propane, Methane and Oil Viscosity in Enhancing the Foamy Oil Phenomenon and Performance of Cyclic Solvent Injection (CSI), Society of Petroleum Engineers, 2017. Experimental Studies, C. SPE Latin America and Caribbean Petroleum Engineering Conference.

[17] L. Lin, H. Ma, F. Zeng, Y. Gu, A Critical Review of the Solvent-Based Heavy Oil Recovery Methods, C. SPE Heavy Oil Conference-Canada, Society of Petroleum Engineers, 2014.

[18] J. Nenniger, S. Dunn, How Fast Is Solvent Based Gravity Drainage?, C, Petroleum Society of Canada, 2008. Canadian International Petroleum Conference.

[19] T. Nasr, G. Beaulieu, H. Golbeck, G. Heck, Novel expanding solvent-SAGD process “ES-SAGD”, J. J. Can. Pet. Technol. 42 (1) (2003) 13-16, http://dx.doi.org/10.2118/03-01-TN.

[20] S. Gupta, S. Gittins, Optimization of solvent aided process, J. J. Can. Pet. Technol. 48 (1) (2009) 49-53, http://dx.doi.org/10.2118/09-01-49.

[21] I. Gates, N. Chakrabarty, Design of the steam and solvent injection strategy in expanding solvent steam-assisted gravity drainage, J. J. Can. Pet. Technol. 47 (9) (2008), http://dx.doi.org/10.2118/08-09-12-CS.

[22] S. Das, R. Butler, Effect of asphaltene deposition on the Vapex process: a preliminary investigation using a Hele-Shaw cell, J. J. Can. Pet. Technol. 33 (6) (1994) 39-45, http://dx.doi.org/10.2118/94-06-06.

[23] A. Badamchi-Zadeh, H. Yarranton, B.B. Maini, M. Satyro, Phase behaviour and physical property measurements for VAPEX solvents: part II, propane, carbon dioxide and Athabasca bitumen, J. J. Can. Pet. Technol. 48 (3) (2009) 57-65.

[24] H. Zhang, J. An, G. Wu, Y.Wang, The CO₂ cyclic stimulation investigation and trial in deep-seated viscous oil reservoir, J. Oil Drilling Prod. Technol. 24 (4) (2002) 53-56, http://dx.doi.org/10.13639/j.odpt.2002.04.023.

[25] V. Oballa, R. Butler, An experimental study of diffusion in the bitumentoluene system, J. J. Can. Pet. Technol. 28 (2) (1989), http://dx.doi.org/10.2118/89-02-03.

[26] W. Li, Study on the Displacement Mechanism of Expending Solvent-Steam Assisted Gravity Drainage(ES-SAGD), D. China University of Petroleum, 2013.

[27] R. Butler, I. Mokrys, Closed-loop extraction method for the recovery of heavy oils and bitumens underlain by aquifers: the VAPEX process, J. J. Can. Pet. Technol. 37 (4) (1998) 41-50, http://dx.doi.org/10.2118/98-04-04.

[28] A. Badamchi-Zadeh, H. Yarranton, W. Svrcek, B. Maini, Phase behaviour and physical property measurements for VAPEX solvents: Part I. Propane and Athabasca bitumen, J. J. Can. Pet. Technol. 48 (1) (2009) 54-61.

[29] T.W. Frauenfeld, G. Kissel, W. Shibing Zhou, PVT and Viscosity Measurements for Lloydminster-Aberfeldy and Cold Lake Blended Oil Systems, C, Petroleum Society of Canada, 2002. Canadian International Petroleum Conference.

[30] R.M. Butler, I.J. Mokrys, A new process (VAPEX) for recovering heavy oils using hot water and hydrocarbon vapour, J. J. Can. Pet. Technol. 30 (1) (1991).

[31] A. Yazdani, B.B. Maini, Modeling of the VAPEX process in a very large physical model, J. Energy Fuels 22 (1) (2008) 535-544.

[32] Y. Li, Y. Wu, F. Zhao, P. Liu, X. Li, S. Yang, et al., Influence factors experiment of deasphalting in solvent vapor extraction, J. Acta Petrolei Sinica 35 (5) (2014) 935-940, http://dx.doi.org/10.7623/syxb201405014.

[33] S.K. Das, Vapex: an efficient process for the recovery of heavy oil and bitumen, J. SPE. 3 (3) (1998) 232-237, http://dx.doi.org/10.2118/50941-PA.

[34] P. Haghighat, B. Maini, Role of asphaltene precipitation in VAPEX process, J. J. Can. Pet. Technol 49 (3) (2010) 14-21, http://dx.doi.org/10.2118/134244-PA.

[35] K. Guo, H. Li, Z. Yu, In-situ heavy and extra-heavy oil recovery: a review, J. Fuel 185 (2016) 886-902, http://dx.doi.org/10.1016/j.fuel.2016.08.047.

[36] A. Turta, In Situ Combustion. Enhanced Oil Recovery Field Case Studies, M. Gulf Professional Publishing Boston, 2013, pp. 447-541.

[37] L. Castanier, W. Brigham, Upgrading of crude oil via in situ combustion, J. J. Pet. Sci. Eng. 39 (1) (2003) 125-136.

[38] C. Wu, P. Fulton, Experimental simulation of the zones preceding the combustion front of an in-situ combustion process, J. SPE. J 11 (1) (1971) 38-46, http://dx.doi.org/10.2118/2816-PA.

[39] B. Hascakir, C. Ross, L.M. Castanier, A. Kovscek, Fuel formation and conversion during in-situ combustion of crude oil, J. SPE. J 18 (6) (2013) 1217-1228, http://dx.doi.org/10.2118/146867-PA.

[40] S. Ali, A current appraisal of in-situ combustion field tests, J. J. Pet. Technol. 24 (4) (1972) 477-486.

[41] H. Ramey Jr., V. Stamp, F. Pebdani, J. Mallinson, California, C. SPE/DOE,Case History of South Belridge, In-Situ Combustion Oil Recovery, Society of Petroleum Engineers, 1992. Enhanced Oil Recovery Symposium.

[42] C.F. Gates, H.J. Ramey Jr., A method for engineering in-situ combustion oil recovery projects, J. J. Pet. Technol. 32 (2) (1980) 285-294.

[43] L.A. Johnson Jr., L. J. Fahy, L.J. Romanowski, R.V. Barbour, K.P. Thomas, An echoing in-situ combustion oil recovery project in a Utah tar sand, J. J. Pet. Technol. 32 (2) (1980) 295-305, http://dx.doi.org/10.2118/7511-PA.

[44] X. Zhang, Q. Liu, H. Che, Parameters determination during in situ combustion of Liaohe heavy oil, J. Energy Fuels 27 (6) (2013) 3416-3426.

[45] J-h Huang, W-l Guan, C-f XI, H-j Cheng, X-l Li, Y-x Wang, Production performance of in-situ combustion in heavy oil reservoir after steam injection, J. Xinjiang Petroleum Geol. 31 (5) (2010) 517-520.

[46] Situ Combustion Initiation Process P. Google Patents, 1972.

[47] Initiation of in Situ Combustion in Carbonaceous Stratum, P. Google Patents, 1961.

[48] S. Razaghi, R. Kharrat, D. Price, S. Vossoughi, D. Rashtchian,Feasibly Study of Auto-Ignition Process in Heavy Oil Reservoirs, 2005. C. SPE International Thermal Operations and Heavy Oil Symposium held in Calgary, Alberta, Canada.

[49] J.T. Moss, P.D. White, J.S. McNiel Jr., In situ combustion process -results of a five-well field experiment in southern Oklahoma, J. SPE 216 (1959) 55-64.

[50] A.B. Strazzi, O.V. Trevisan, Catalytic Effect of Metallic Additives on In-Situ Combustion of Two Brazilian Medium and Heavy Oils, Society of Petroleum Engineers, 2014. C. SPE Latin America and Caribbean Petroleum Engineering Conference.

[51] Method of Heating Subterranean Formations, P. Google Patents, 1956.

[52] S. Hartley, W. Holmes, J. Jacques, M. Mole, J. McCoubrey, Thermochemical properties of phosphorus compounds, J. Chem. Soc. Rev. 17 (2) (1963) 204-223, http://dx.doi.org/10.1039/QR9631700204.

[53] M. Greaves, A. El-Sakr, T.X. Xia, C. Ayasse, A. Turta, Thai -new air injection technology for heavy oil recovery and in situ upgrading, J. J. Can. Pet. Technol. 40 (3) (2001), http://dx.doi.org/10.2118/01-03-03.

[54] T.X. Xia, M. Greaves, A.T. Turta, C. Ayasse, Thaida ‘short-distance Displacement’In situ combustion process for the recovery and upgrading of heavy oil, C, Chem. Eng. Res. Des. 81 (3) (2003) 295-304.

[55] M. Greaves, T.X. Xia, Underground Upgrading of Heavy Oil Using Thai-“Toeto-Heel Air Injection”, Calgary, Alberta,Canada, 2005. C. SPE International Thermal Operations and Heavy Oil Symposium.

[56] C. Ayasse, C. Bloomer, E. Lyngberg, W. Boddy, J. Donnelly, M. Greaves, First Field Pilot of the Thai Process, C. Canadian International Petroleum Conference, Petroleum Society of Canada, Calgary, Alberta, 2005, 16.

[57] R. Moore, S. Mehta, M. Ursenbach, A Guide to High Pressure Air Injection (HPAI) Based Oil Recovery, C. SPE/DOE Improved Oil Recovery Symposium, Society of Petroleum Engineers, Tulsa, Oklahoma, 2002.

[58] S. Mitra, B.V. Bhushan, V.R. Pilli, S. Kumar, S. Sur, S.A. Mehta, et al., Feasibility of Air Injection in a Light Oil Field of Western India, C, Society of Petroleum Engineers, 2010. SPE Oil and Gas India Conference and Exhibition.

[59] M. Fassihi, D. Yannimaras, V. Kumar, Estimation of recovery factor in light-oil air-injection projects, J. SPE Reserv. Eng. 12 (3) (1997) 173-178, http://dx.doi.org/10.2118/28733-PA.

[60] C. Clara, M. Durandeau, G. Quenault, T.-H. Nguyen, Laboratory studies for light-oil air injection projects: potential application in Handil field, J. SPE Reserv Eva. Eng. 3 (3) (2000) 239-248, http://dx.doi.org/10.2118/64272-PA.

[61] J. Hu, Y. Chengdong, Z. Yuchuan, Recent Progress of High Pressure Air Injection (HPAI) Process in Light Oil Reservoir: Laboratory Investigation and Field Application, C, 2012. SPE Heavy Oil Conference Canada.

[62] M. Greaves, S. Ren, R. Rathbone, Air Injection Technique (LTO Process) for IOR from Light Oil Reservoirs: Oxidation, C, Society of Petroleum Engineers, 1998. SPE/DOE Improved Oil Recovery Symposium.

[63] T. Xia, M. Greaves, Upgrading Athabasca tar sand using toe-to-heel air injection, J. J. Can. Pet. Technol. 41 (8) (2002), http://dx.doi.org/10.2118/02-08-02.

[64] T. Xia, M. Greaves, A. Turta, Main mechanism for stability of Thai-“toe-toheel air injection”, J. J. Can. Pet. Technol. 44 (1) (2003) http://dx.doi.org/10.2118/05-01-03.

[65] S. Fatemi, C. Ghotbi, R. Kharrat, Effect of wells arrangement on the performance of toe-to-heel air injection, J. Bra. J. Pet. Gas 3 (1) (2009).

[66] M. Rabiu Ado, M. Greaves, S.P. Rigby, Dynamic simulation of the toe-to-heel air injection heavy oil recovery process, J. Energy Fuels 31 (2) (2017) 1276-1284, http://dx.doi.org/10.1021/acs.energyfuels.6b02559.

[67] M. Cinar, L.M. Castanier, A.R. Kovscek, Combustion kinetics of heavy oils in porous media, J. Energy Fuels 25 (10) (2011) 4438-4451, http://dx.doi.org/10.1021/ef200680t.

[68] A. Lapene, G. Debenest, M. Quintard, L.M. Castanier, M.G. Gerritsen, A.R. Kovscek,Kinetics oxidation of heavy oil. 1. Compositional and full equation of state model, J. Energy Fuels 25 (11) (2011) 4886-4895, http://dx.doi.org/10.1021/ef200365y.

[69] S.R. Ren, M. Greaves, R. Rathbone, Air injection LTO process: an IOR technique for light-oil reservoirs, J. SPE. J 7 (1) (2002) 90-99, http://dx.doi.org/10.2118/57005-PA.

[70] Y.-B. Li, Y. Chen, W.-F. Pu, H. Gao, B. Bai, Experimental investigation into the oxidative characteristics of Tahe heavy crude oil, J. Fuel 209 (1) (2017) 194-202, http://dx.doi.org/10.1016/j.fuel.2017.07.029.

[71] M.K. Dabbous, P.F. Fulton, Low-temperature-oxidation reaction kinetics and effects on the in-situ combustion process, J. SPE. J 14 (3) (1974) 253-262, http://dx.doi.org/10.2118/4143-PA.

[72] B. Niu, S. Ren, Y. Liu, D. Wang, L. Tang, B. Chen, Low-temperature oxidation of oil components in an air injection process for improved oil recovery, J. Energy Fuels 25 (10) (2011) 4299-4304, http://dx.doi.org/10.1021/ef200891u.

[73] Y. Barzin, R.G. Moore, S.A. Mehta, D.G. Mallory, M.G. Ursenbach, F. Tabasinejad, Role of Vapor Phase in Oxidation/combustion Kinetics of High-Pressure Air injection(HPAI), C, Society of Petroleum Engineers, 2010. SPE Annual Technical Conference and Exhibition.

[74] Y.-B. Li, W.-F. Pu, L. Sun, F.-Y. Jin, J.-Y. Zhao, J.-Z. Zhao, et al., Effect of formation factors on light crude oil oxidation via TG-FTIR, J. J. Therm. Anal. Calorim 118 (3) (2014) 1685-1695, http://dx.doi.org/10.1007/s10973-014-4046-2.

[75] J. Belgrave, R. Moore, M. Ursenbach, D. Bennion,A comprehensive approach to in-situ combustion modeling, J. SPE Adv. Technol. Ser. 1 (1) (1993) 98-107, http://dx.doi.org/10.2118/20250-PA.

[76] M. Greaves, O. Al-Shamali, In situ combustion ISC process using horizontal wells, J. J. Can. Pet. Technol. 35 (4) (1996) 49-55, http://dx.doi.org/10.2118/96-04-05.

[77] Abu II R.G. Moore S.A. Mehta M.G. Ursenbach D.G. Mallory P. Pereira Almao, et al., Upgrading of Athabasca bitumen using supported catalyst in conjunction with in-situ combustion, J. J. Can. Pet. Technol. 54 (4) (2015) 220-232, http://dx.doi.org/10.2118/176029-PA.

[78] M. Ranjbar, G. Pusch, Pyrolysis and combustion kinetics of crude oils, asphaltenes and resins in relation to thermal recovery processes, J. J. Anal. Appl. Pyrolysis 20 (1991) 185-196.

[79] M.V. Kök, M.R. Pamir, Pyrolysis and combustion studies of fossil fuels by thermal analysismethods, J. J. Anal. Appl. Pyrolysis 35 (2) (1995) 145-156, http://dx.doi.org/10.1016/0165-2370(95)00912-0.

[80] P. Clark, J. Hyne, Steam-oil chemical reactions: mechanisms for the aquathermolysis of heavy oils, J. Aostra J Res. 1 (1) (1984) 15-20.

[81] J. Hyne, P. Clark, R. Clarke, J. Koo, J. Greidanus, J. Tyrer, et al. Aquathermolysis of heavy oils, J. Rev. Tec., Int 2 (2) (1982) 87-94.

[82] P.D. Clark, J.B. Hyne, J.D. Tyrer, Some chemistry of organosulphur compound types occurring in heavy oil sands.2. Influence of pH on the high temperature hydrolysis of tetrahydrothiophene and thiophene, J. Fuel 63 (1) (1984) 125-128.

[83] P.D. Clark, J.B. Hyne, J.D. Tyrer, Chemistry of organosulphur compound types occurring in heavy oil sand.1. High temperature hydrolysis and thermolysis of tetrahydrothiophene in relation to steam stimulation processes, J. Fuel 62 (8) (1983) 959-962.

[84] S. Maity, J. Ancheyta, G. Marroquín, Catalytic aquathermolysis used for viscosity reduction of heavy crude oils: a review, J. Energy Fuels 24 (5) (2010) 2809-2816, http://dx.doi.org/10.1021/ef100230k.

[85] J.D. Alexander, W.L. Martin, J.N. Dew, Factors affecting fuel availability and composition during in situ combustion, J. J. Pet. Technol. 14 (10) (1962) 1154-1164, http://dx.doi.org/10.2118/296-PA.

[86] K. Lim, H. Ramey Jr. W. E. Brigham, Z. Stanford Univ, Steam Distillation Effect and Oil Quality Change during Steam Injection, Petroleum Research Inst, CA (United States), 1992.

[87] J. Hyne, J. Greidanus, J. Tyrer, D. Verona, C. Rizek, P. Clark, et al., Aquathermolysis of heavy oils, C, Rev. Tec. INTEVEP 2 (2) (1982) 87-94.

[88] J. Belgrave, R. Moore, M. Ursenbach, Comprehensive kinetic models for the aquathermolysis of heavy oils, J. J. Can. Pet. Technol. 36 (4) (1997) 38-44, http://dx.doi.org/10.2118/97-04-03.

[89] P.R. Kapadia, M.S. Kallos, I.D. Gates, A review of pyrolysis, aquathermolysis, and oxidation of Athabasca bitumen, Fuel Process. Technol. 131 (2015) 270-289.

[90] O. Muraza, A. Galadima, Aquathermolysis of heavy oil: a review and perspective on catalyst development, J. Fuel 157 (2015) 219-231, http://dx.doi.org/10.1016/j.fuel.2015.04.065.

[91] S. Wen, Y. Zhao, Y. Liu, S. Hu, A Study on Catalytic Aquathermolysis of Heavy Crude Oil during Steam Stimulation, C, U.S.A. Society of Petroleum Engineers, Houston, Texas, 2007. International Symposium on Oilfield Chemistry.

[92] C. Wu, G. Lei, C. Yao, X. Jia, In Situ Upgrading Extra-heavy Oil by Catalytic Aquathermolysis Treatment Using a New Catalyst Based Anamphiphilic Molybdenum Chelate, C. International Oil and Gas Conference and Exhibition in China, Society of Petroleum Engineers, Beijing, China, 2010, 9.

[93] A.V. Galukhin, A.A. Erokhin, A.V. Gerasimov, A.A. Eskin, D.K. Nurgaliev, Influence of Iron Pentacarbonyl on Catalytic Aquathermolysis of Heavy Oil: Changes of Oil’s Parameters and Formation of Magnetic Nanoparticles (Russian), C. SPE Russian Petroleum Technology Conference, Society of Petroleum Engineers, Moscow, Russia, 2015, 11.

[94] S. Yi, T. Babadagli, H.A. Li, Catalytic-effect comparison between nickel and iron oxide nanoparticles during aquathermolysis-aided cyclic steam stimulation, J. SPE. Reserv. Eva. Eng 23 (1) (2020) 282-291, http://dx.doi.org/10.2118/197062-PA.

[95] L.L. Yongjian, Zhong, Fan Hongfu, Zhao Xiaofei, Hu Shaobing, The pilot test of aquathermolysis process of ultra-heavy oil in Liaohe oil field, J. J. Daqing Pet. Ins 26 (3) (2002) 99-101.

[96] B. Li, Experiments of in-situ upgrading heavy oil by means of catalyst and hydrogen donor, J. J. J. Daqing Pet. Ins (4) (2004) 24-26.

[97] X. Dong, H. Liu, K. Wu, Z. Chen, C. Spe Improved, EOR Potential in the Post Steam Injection Era: Current and Future Trends, Society of Petroleum Engineers, Tulsa, Oklahoma, USA, 2018. Oil Recovery Conference.

[98] S. Vossoughi, G.P. Willhite, W.P. Kritikos, I.M. Guvenir, Y. El Shoubary, Automation of an in-situ combustion tube and study of the effect of clay on the in-situ combustion process, J. SPE 22 (4) (1982) 493-502, http://dx.doi.org/10.2118/10320-PA.

[99] M.L. Kozlowski, A. Punase, H.A. Nasr-El-Din, B. Hascakir, The Catalytic Effect of Clay on In-Situ Combustion Performance, C. SPE Latin American and Caribbean Petroleum Engineering Conference, Society of Petroleum Engineers, Quito, Ecuador, 2015, 15.

[100] A. Strazzi, O.V. Trevisan, Catalytic Effect of Metallic Additives on In-Situ Combustion of Two Brazilian Medium and Heavy Oils, C. SPE Latin America and Caribbean Petroleum Engineering Conference, Society of Petroleum Engineers, Maracaibo, Venezuela, 2014, 26.

[101] C. Yuan, S.S. Mehrabi-Kalajahi, K. Sadikov, M.A. Varfolomeev, D.A. Emelianov, N.O. Rodionov, et al., Potential of Copper-Based Oil Soluble Catalyst for Improving Efficiency of In-Situ Combustion Process: Catalytic Combustion, Catalytic In-Situ Oil Upgrading, and Increased Oil Recovery, C, Mishref, Kuwait. Society of Petroleum Engineers, 2019. SPE Kuwait Oil & Gas Show and Conference.

[102] J.G. Weissman, R.V. Kessler, R.A. Sawicki, J.D.M. Belgrave, C.J. Laureshen, S.A. Mehta, et al., Down-Hole catalytic upgrading of heavy crude oil, J. Energy Fuels 10 (4) (1996) 883-889, http://dx.doi.org/10.1021/ef9501814.

[103] T.X. Xia, M. Greaves, W.S. Werfilli, R.R. Rathbone, Downhole Conversion of Lloydminster Heavy Oil Using Thai-CAPRI Process, C. SPE International Thermal Operations and Heavy Oil Symposium and International Horizontal Well Technology Conference, Canada. Society of Petroleum Engineers, Calgary, Alberta, 2002, 16.

[104] A. Hart, G. Leeke, M. Greaves, J. Wood, Down-hole heavy crude oil upgradingby CAPRI: effect of hydrogen and methane gases upon upgrading and coke formation, J. Fuel 119 (1) (2014) 226-235.