[특허]Process for purification by combination of an effluent that contains carbon dioxide and hydrocarbons

[미국특허] Process for purification by combination of an effluent that contains carbon dioxide and hydrocarbons 원문보기

IPC분류정보
국가/구분	United States(US) Patent 등록
국제특허분류(IPC7판)	E21B-043/40
출원번호	US-0843645 (2001-04-27)
우선권정보	FR-0005425 (2000-04-27)
발명자 / 주소	Minkkinen, Ari Rojey, Alexandre
출원인 / 주소	Institut Francais du Petrole
대리인 / 주소	Millen, White, Zelano & Branigan, P.C.
인용정보	피인용 횟수 : 79 인용 특허 : 8

초록 ▼

For the purification of an effluent that contains carbon dioxide and hydrocarbons resulting from a carbon dioxide-assisted recovery stage, the effluent is circulated in a gas-liquid separator (3) to recover C3+liquid and a gas that contains carbon dioxide and, for example, less than 10% of methane and ethane. Pressurized combustion (13) of the gas with air produced a combustion gas (21) enriched with carbon dioxide and water vapor. The combustion gas (21) is cooled (11) (22) to recover heat, and the cooled combustion gas is recycled under pressure by a compressor (27) to an injection well (29). Nitrogen is at least partly separated from the combustion gas before the recycling, and in an optional intermediate step the condensed water is also separated from the carbon dioxide. The invention has a particular application for the assisted recovery of petroleum by CO2with a reduction of the greenhouse effect.

대표청구항 ▼

1. A process for purification of a G/L two-phase effluent containing carbon dioxide and gaseous and liquid hydrocarbons obtained from at least one hydrocarbon production well utilizing an injection of carbon dioxide into a formation, said process comprising: a) separating said G/L effluent in at least one main gas-liquid separator (3), to separate C3+hydrocarbons (5) from a gaseous effluent (10) containing a major portion of carbon dioxide (CO2) and a minor portion of methane and ethane, b) subjecting said gaseous effluent to pressurized combustion (13) in the presence of oxygen in a combustion reactor, and recovering a combustion effluent (21) containing carbon dioxide, water vapor, and nitrogen, c) cooling (11/22) said combustion effluent (21), d) separating the nitrogen at least in part from the cooled combustion effluent; and e) recycling the pressurized, cooled combustion effluent into an injection well. 2. A process according to claim 1, wherein a temperature increase of the combustion effluent, due to the exothermicity of the combustion reaction, is controlled by indirect heat exchange between the combustion effluent and a coolant (30) to recover the heat of combustion. 3. A process according to claim 1, further comprising, after stage c), cooling the combustion effluent and separating the resultant condensed water from the combustion effluent in an H2O/CO2separator (24). 4. A process according to claim 1, wherein the combustion of the gaseous effluent is carried out in the presence of a catalyst. 5. A process according to claim 3, wherein the G/L effluent from the production well contains hydrogen sulfide, the separation stage of the water in the separator comprises a sulfur dioxide (SO2) scrubbing stage to remove SO2resulting from the combustion of hydrogen sulfide in the combustion reactor, and an effluent that contains water and at least the major portion of SO2is recovered from said scrubbing stage. 6. A process according to claim 5, wherein the SO2scrubbing stage comprises a direct contact of the combustion effluent with water. 7. A process according to claim 3, further comprising cooling at least a portion of the separated condensed water and recycling the cooled water to the H2O/CO2separator. 8. A process according to claim 1, wherein separation of said G/L effluent comprises introducing G/L effluent from the production well into gas-liquid separator (3), recovering a first fraction (5) containing the C3+liquid hydrocarbons at the bottom of said separator (3), and recovering a second fraction (4) containing carbon dioxide and a minor portion of hydrocarbons from the top of said separator (3); compressing (6) said second fraction, and introducing the compressed second fraction into a secondary gas-liquid separator (8) wherein said gaseous effluent (10) is separated from remaining C3+hydrocarbons (9). 9. A process according to claim 1, further comprising reheating said gaseous effluent (10) by indirect heat exchange (11) with effluent (21) from the combustion reaction (13) before said gaseous effluent is subjected combustion reaction. 10. A process according to claim 1, further comprising introducing fuel into the combustion reactor at a rate sufficient to maintain a substantially constant temperature level in the combustion reactor. 11. A process according to claim 1, wherein the separation of the nitrogen from the combustion effluent is carried out by cryogenic distillation.

이 특허에 인용된 특허 (8) 인용/피인용 타임라인 분석

Gottier Gerry N. (Allentown PA), Hydrocarbon recovery from carbon dioxide-rich gases.
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Madgavkar, Ajay M.; Swift, Harold E., Selective combusting of hydrogen sulfide in carbon dioxide injection gas.
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[미국특허] Process for purification by combination of an effluent that contains carbon dioxide and hydrocarbons 원문보기

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[미국특허] Process for purification by combination of an effluent that contains carbon dioxide and hydrocarbons 원문보기

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