Formation damage by CO2-induced asphaltene precipitation

R. T. Okwen

doi:10.2523/98180-ms

Formation damage by CO₂-induced asphaltene precipitation

Research output: Contribution to conference › Paper › peer-review

Abstract

A study was carried out to determine why the presence of water reduces the amount of asphaltenes precipitated during CO ₂ injections. Higher injection pressures were needed in limestone cores than sandstone cores during gas flooding due to the low permeabilities of limestone. A very high recovery efficiency of n-C ₁₀ displacement by CO ₂ injection was achieved because of the absence of asphaltenes. For reservoirs containing crude oils with high asphaltene content, dry and/or pure CO ₂ injection was not economically feasible or attractive as an injection fluid because of the low oil recoveries resulting from reservoir pore blockages. Formation water acted as a CO ₂ buffer in tertiary CO ₂ injection. More crude oil was displaced by CO ₂ injection at > 25°C. This is an abstract of a paper presented at the SPE International Symposium and Exhibition on Formation Damage Control (Lafayette, LA 2/15-17/2006).

Original language	English (US)
DOIs	https://doi.org/10.2523/98180-ms
State	Published - 2006
Externally published	Yes
Event	2006 SPE International Symposium and Exhibitionon Formation Damage Control - Lafayette, LA, United States Duration: Feb 15 2006 → Feb 17 2006

Other

Other	2006 SPE International Symposium and Exhibitionon Formation Damage Control
Country/Territory	United States
City	Lafayette, LA
Period	2/15/06 → 2/17/06

ASJC Scopus subject areas

Energy Engineering and Power Technology
Geotechnical Engineering and Engineering Geology

Online availability

10.2523/98180-ms

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Cite this

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title = "Formation damage by CO2-induced asphaltene precipitation",

abstract = "A study was carried out to determine why the presence of water reduces the amount of asphaltenes precipitated during CO 2 injections. Higher injection pressures were needed in limestone cores than sandstone cores during gas flooding due to the low permeabilities of limestone. A very high recovery efficiency of n-C 10 displacement by CO 2 injection was achieved because of the absence of asphaltenes. For reservoirs containing crude oils with high asphaltene content, dry and/or pure CO 2 injection was not economically feasible or attractive as an injection fluid because of the low oil recoveries resulting from reservoir pore blockages. Formation water acted as a CO 2 buffer in tertiary CO 2 injection. More crude oil was displaced by CO 2 injection at > 25°C. This is an abstract of a paper presented at the SPE International Symposium and Exhibition on Formation Damage Control (Lafayette, LA 2/15-17/2006).",

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