Foams Prove Effectiveness for Gas Injection Conformance and Sweep Efficiency Improvement in a Low porosity Fractured Reservoir – Field Pilots
- Alonso Ocampo-Florez (Equion Energia Ltd.) | Alejandro Restrepo (Equion Energia Ltd.) | Natalia Rendon (Equion Energia Ltd.) | Jorge Coronado (Equion EnergÃa Ltd.) | Juan Alejandro Correa (Equion EnergÃa Ltd.) | Diego Alejandro Ramirez (Equion Energia Ltd.) | Monica Torres (Equion Energia Ltd.) | Rosa Sanabria (Equion Energia Ltd.) | Sergio Hernando Lopera (Universidad Nacional De Colombia)
- Document ID
- International Petroleum Technology Conference
- International Petroleum Technology Conference, 10-12 December, Kuala Lumpur, Malaysia
- Publication Date
- Document Type
- Conference Paper
- 2014. International Petroleum Technology Conference
- Foams, EOR, Fractured Reservoir, Gas Injection, Efficiency Improvement
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- 326 since 2007
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Foams have proved to be efficient to block temporarily high conductivity layers, and improving gas injection conformance and sweep efficiency in predominantly matrix reservoir systems, at least at lab and field pilot tests; nevertheless, its successful use in naturally fractured reservoirs has not been fully demonstrated as of today. This paper presents the evaluation process and the successful results for two (2) foam EOR field pilots performed in the Cupiagua in Recetor field; a gas condensate system whose main reservoir is a low porosity (<6%) quartzarenite with matrix permeabilities in the range of 0.01 to 10 mD, and where the fracture corridors are confirmed to play an important role both in well productivity/injectivity, and in the inter-well connectivity and gas channelling between gas injectors and oil producers.
The reservoir has been developed under massive hydrocarbon gas re-injection, and the current recovery factors of condensate are between 35-40%. The foam treatments were deployed in two gas injectors located in different areas of the field, each one impacting two oil producers, and exhibiting different levels of gas recycling, with GOR ranging between 40,000 and 100,000 scf/STB.
Both operations were performed via bull-heading using the SAG method. The results for both jobs showed a temporary reduction in gas injectivity, with slow recovery to its base line within the next 3 months. Despite showing little changes in the injection profile at the gas injectors, the two producers affected by the first job showed a clear change in GOR trends, and a consistent ramp-up in oil production rates during a period of at least 7 months, reaching a maximum increase between 15 and 30 % over their base line productions. The second job was performed to confirm consistency and repeatability of technology, and evaluate duration cycle of blocking and benefit effects. Early surveillance indicates positive response both at the gas injector, and the oil producers. Results herein presented, confirm the viability for foams as an EOR method for this naturally fractured field, and open EOR opportunities for other fractured reservoirs located in the same basin and exploited under gas injection schemes.
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