SPE Latin American and Caribbean Petroleum Engineering Conference 2015
DOI: 10.2118/177220-ms
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Experimental Study of Heavy Oil In-Situ Upgrading Using High Temperature Gas-Oil Gravity Drainage in Naturally Fractured Reservoirs

Abstract: Heavy oil recovery from matrix blocks of Indiana limestone and Silurian dolomite core samples was studied using a cylindrical core holder set-up. Fractures in the system were represented by a gap between the core sample and core holder wall. Core samples and fractures were respectively saturated with heavy oil and gas. Oil recovery experiments were conducted in batch-mode using two different gases, nitrogen and carbon dioxide, at 1000 psi and various temperatures (200, 250, and 300 °C). N2 was employed as an i… Show more

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Cited by 3 publications
(5 citation statements)
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“…The findings discussed in this section, along with those reported elsewhere, 30,31 allow us to suggest a mechanism by which heavy oil contained in a carbonate matrix is recovered when the nanocatalytic in situ technology is applied in naturally fractured reservoirs. Thus, three mechanistic steps seem to contribute to oil recovery.…”
Section: Resultsmentioning
confidence: 99%
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“…The findings discussed in this section, along with those reported elsewhere, 30,31 allow us to suggest a mechanism by which heavy oil contained in a carbonate matrix is recovered when the nanocatalytic in situ technology is applied in naturally fractured reservoirs. Thus, three mechanistic steps seem to contribute to oil recovery.…”
Section: Resultsmentioning
confidence: 99%
“…The findings discussed in this section, along with those reported elsewhere, , allow us to suggest a mechanism by which heavy oil contained in a carbonate matrix is recovered when the nanocatalytic in situ technology is applied in naturally fractured reservoirs. Thus, three mechanistic steps seem to contribute to oil recovery. Thermal recovery: the heat carried by the hot VR is transferred to the rock, producing rock expansion, which, along with the concomitant reduction in viscosity, leads to the expulsion of the oil contained within the porous space of the carbonate. Solution gas drive: some of the hydrogen gas added to promote hydrotreating reactions diffuses inside the matrix and dissolves in the oil (solubility of hydrogen in heavy oil and VR is known to increase with increasing temperatures and pressures , ), and the dissolved gas further reduces oil viscosity and enhances oil production. Miscibility: light hydrocarbons produced by the conversion of the VR in the fractures also penetrate the porosity of the carbonate rock and can even further react in the presence of a catalyst inside the matrix, thus contributing to the reduction in oil’s viscosity by dilution, which increases the amount of oil expelled.…”
Section: Results and Discussionmentioning
confidence: 99%
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