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RECOVERY STUDY ON GAS INJECTION SIMULATION BY EOS IN GAS CONDENSATE RESERVOIR

Ping Guo

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Abstract

Gas injection can prevent condensate oil from separating out from gas condensate reservoir. The PVTCOG application software developed by ourselves and the PR state equation were employed in a real closed condensate gas reservoir to study the depletion performance in different production stages, the influence of dry gas, the nitrogen and carbon dioxide on the dew point pressure, the gas injection time, the condensate oil reserve and the condensate oil recovery. The results showed that: different injection gas has different impact on dew point pressure; with more gas injection the condensate oil reserve will come down while the condensate oil recovery will go up; the optimum time for gas injection is not necessarily at pressure higher than dew point pressure.

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What this paper is about

Gas injection can prevent condensate oil from separating out from gas condensate reservoir. The PVTCOG application software developed by ourselves and the PR state equation were employed in a real closed condensate gas reservoir to study the depletion performance in different production stages, the influence of dry gas, the nitrogen and carbon dioxide on the dew point pressure, the gas injection time, the condensate oil reserve and the condensate oil recovery. The results showed that: different injection gas has different impact on dew point pressure; with more gas injection the condensate oil reserve will come down while the condensate oil recovery will go up; the optimum time for gas injection is not necessarily at pressure higher than dew point pressure.

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Available abstract

Gas injection can prevent condensate oil from separating out from gas condensate reservoir. The PVTCOG application software developed by ourselves and the PR state equation were employed in a real closed condensate gas reservoir to study the depletion performance in different production stages, the influence of dry gas, the nitrogen and carbon dioxide on the dew point pressure, the gas injection time, the condensate oil reserve and the condensate oil recovery. The results showed that: different injection gas has different impact on dew point pressure; with more gas injection the condensate oil reserve will come down while the condensate oil recovery will go up; the optimum time for gas injection is not necessarily at pressure higher than dew point pressure.

Key concepts: Dew point, Petroleum engineering, Dew, Gas oil ratio, Carbon dioxide, Chemistry, Enhanced oil recovery, Reservoir simulation

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