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Field Pilots Show Effectiveness of Foams in Low-Porosity Naturally Fractured Reservoir

Fig. 1—LR YR-7 foam-pilot area and affected-oil-producers response, first pilot.

Foams have proved to be efficient at temporarily blocking high-conductivity layers and improving gas-injection conformance and sweep efficiency in predominantly matrix reservoir systems, at least in laboratory and field pilot tests. However, their successful use in naturally fractured reservoirs has yet to be fully demonstrated. This paper presents the evaluation process and the successful results for two foam-enhanced-oil-recovery (EOR) field pilots.

Introduction

The Recetor area corresponds to the northern extension of the larger Cupiagua field, which is 115 km northeast of Bogotá in the foothills of the Eastern Mountain chain in Colombia. The main reservoir is the Mirador formation, a quartzarenite with matrix porosities between 3 and 9% and permeabilities in the range of 0.01 to 10 md, located below 13,000-ft true vertical depth subsea.

In the Recetor area, the fracture corridors are confirmed to play an important role both in well productivity/injectivity and in interwell connectivity and gas channeling between gas injectors and oil producers. This is confirmed by the high connectivity between most of the wells and the observed levels of gas recycling, which could not be explained by the low matrix permeabilities. Current condensate recovery factor is approximately 34%, and steep evolution of gas production has been observed in the wells influenced by the two main gas injectors (LR YR-7 and LR YZ-11) during the last 2 years, with gas/oil ratios (GORs) ranging from 40,000 to 100,000 scf/STB.

This article, written by Special Publications Editor Adam Wilson, contains highlights of paper IPTC 17950, “Foams Prove Effectiveness for Gas-Injection Conformance and Sweep-Efficiency Improvement in a Low-Porosity Fractured Reservoir—Field Pilots,” by A. Ocampo, SPE, A. Restrepo, N. Rendón, J. Coronado, J. Correa, D. Ramirez, M. Torres, and R. Sanabria, Equion Energia, and S. Lopera, National University of Colombia, prepared for the 2014 International Petroleum Technology Conference, Kuala Lumpur, 10–12 December. The paper has not been peer reviewed. Copyright 2014 International Petroleum Technology Conference. Reproduced by permission.
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Field Pilots Show Effectiveness of Foams in Low-Porosity Naturally Fractured Reservoir

01 June 2015

Volume: 67 | Issue: 6

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