Bibliographic Details
| Title: |
Experimental Investigation of the Effects of Temperature and Oil Composition on CO2-Crude Oil Swelling, Extraction Mechanisms, and Displacement Performance. |
| Alternate Title: |
Eksperimentalno ispitivanje utjecaja temperature i sastava nafte na bubrenje nafte izazvano istiskivanjem s CO2, mehanizme ekstrakcije i karakteristike istiskivanja. |
| Authors: |
Hartono, Kartika1 kartika@trisakti.ac.id, Permadi, Asep K.2, Siagia, Ucok W. R.2, Hakim, Andri L.2, Paryoto, Sumadi3, Resha, Ahlul H.4, Satya, Syaeful A.4, Pratiwi, Reno1, Djumantara, Maman1, Chusniah, Dina A.1 |
| Source: |
Rudarsko-Geološko-Naftni Zbornik. 2026, Vol. 41 Issue 3, p55-67. 13p. |
| Subject Terms: |
*Carbon dioxide flooding, *Temperature effect, *Petroleum chemistry, *Enhanced oil recovery, *Swelling of materials, *Extraction techniques |
| Abstract (English): |
CO2 flooding has several advantages for enhancing oil recovery, including a reduction in crude oil viscosity, a decrease in interfacial tension, and an increase in oil volume through swelling. Although the mechanisms of oil swelling and extraction in CO2-crude oil systems have been widely studied, the combined effects of temperature and oil composition on these mechanisms - and their influence on CO2 displacement efficiency in porous media - remain insufficiently understood, especially under high reservoir temperatures. Therefore, this study investigates how temperature and crude oil composition affect swelling-extraction behaviour and CO2 displacement efficiency. High-pressure and high-temperature (HPHT) PVT tests were conducted to evaluate swelling and extraction phenomena, while slim tube experiments were used to assess oil recovery performance. Tests were carried out at 70°C and 90°C using two light dead oils from an Indonesian field under varying injection pressures. Compositional analysis of produced oils was performed using Gas Chromatography (GC) and further interpreted through SARA fractions (saturates, aromatics, resins, and asphaltenes). Results show that lower temperatures enhance CO2 extraction efficiency due to higher CO2 density, leading to more pronounced swelling and miscibility effects. The miscibility was observed within the extraction region, emphasizing the role of hydrocarbon extraction in the miscibility mechanism. Higher temperatures were found to improve oil recovery, primarily due to viscosity reduction. Additionally, increasing CO2 injection pressure reduced resin and asphaltene content, with evidence of asphaltene precipitation in the porous medium - particularly at lower temperatures. These findings provide valuable insight into how temperature and oil composition influence CO2-oil interactions and support more effective implementation of CO2 flooding at elevated reservoir temperatures. [ABSTRACT FROM AUTHOR] |
| Abstract (Bosnian): |
Povećanje iscrpka nafte utiskvanjem CO2 ima nekoliko prednosti, uključujući smanjenje viskoznosti sirove nafte, smanjenje međufazne napetosti i povećanje volumena nafte bubrenjem. Iako su mehanizmi bubrenja i istiskivanja nafte u sustavima CO2-sirova nafta puno proučavani, kombinirani učinci temperature i sastava nafte na te mehanizme - i njihov utjecaj na učinkovitost istiskivanja CO2 u poroznim medijima - još uvijek nisu dovoljno poznati, posebice pri visokim temperaturama ležišta. Stoga se u ovome radu istražuje kako temperatura i sastav sirove nafte utječu na ponašanje bubrenja i istiskivanje te učinkovitost istiskivanja s CO2. Za procjenu fenomena bubrenja i istiskivanja provedeni su PVT testovi u uvjetima visokoga tlaka i visoke temperature (HPHT), dok je procjena iscrpka nafte napravljena ispitivanjem metodom istiskivanja nafte iz cijevi maloga promjera (engl. slim tube experiments). Ispitivanja su provedena na dvije lake otplinjene nafte s indonezijskoga polja pri temperaturi od 70 °C i 90 °C i različitim tlakovima utiskivanja. Analiza sastava proizvedenih nafti napravljena je plinskom kromatografijom (engl. Gas Chromatography, GC), a rezultati su interpretirani prema SARA klasifikaciji (zasićeni ugljikovodici, aromati, smole, asfalteni). Rezultati pokazuju da niže temperature povećavaju učinkovitost istiskivanja s CO2 zbog veće gustoće CO2, što dovodi do izraženijega efekta bubrenja i mješljivosti. Mješljivost je uočena unutar područja istiskivanja, što naglašava ulogu istiskivanja ugljikovodika u mehanizmu miješljivosti. Utvrđeno je da više temperature povećavaju iscrpak nafte, primarno zbog smanjenja viskoznosti. Osim toga, povećanje tlaka utiskivanja CO2 smanjilo je sadržaj smole i asfaltena u proizvedenoj nafti, uz utvrđeno taloženje asfaltena u poroznome mediju, posebice na nižim temperaturama. Ovi rezultati daju vrijedan uvid u to kako temperatura i sastav nafte utječu na interakcije CO2 i nafte te omogućuju učinkovitiju primjenu povećanja iscrpka nafte utiskivanjem CO2 pri povišenim temperaturama ležišta. [ABSTRACT FROM AUTHOR] |
| Database: |
Energy & Power Source |
