Pilot test of CO<sub>2</sub> flooding at Sarukawa oil field

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  • Ohno Takamasa
    JAPEX Research Center, Japan Petroleum Exploration Co., Ltd.

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Other Title
  • 申川油田における炭酸ガス攻法実証試験研究
  • 講演 申川油田における炭酸ガス攻法実証試験研究
  • コウエン シンガワ ユデン ニ オケル タンサンガスコウホウ ジッショウ シケン ケンキュウ
  • Pilot test of CO2 flooding at Sarukawa oil field

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JAPEX (Japan Petroleum Exploration Co., Ltd.) executed a pilot test of CO2 flooding in Sarukawa oil field from 1993 to 2000 collaborating with JNOC (Japan National Oil Corporation). Although CO2 flooding is a wellknown and well understood EOR technology, it is important to realize how and where injected fluid flows and sweep in subsurface reservoir. Depending on information that suggests the fluid flow in situ, injection and production operation must be adjusted and optimized. A five spot pattern was employed for the pilot test.<br>In order to realize how and where injected fluid flows and sweep in subsurface reservoir, several measurements, studies, analyses must be conducted. In laboratory, reservoir core analyses, reservoir fluid analyses, PVT of reservoir oil and CO2 mixtures are typical. Combining those laboratory data with well logging data and well flow test data, numerical simulation models were constructed. Such numerical models were initially utilized for designing pilot test. Before injecting CO2, water flooding was conducted to obtain history data. After water flooding, CO2 injection and WAG followed. During and after pilot test, tremendous amount of data, not only history data but also well test data that indicates heterogeneity of target reservoir, were collected and analyzed. Based on those results, original numerical models were modified and tuned to match history data. After history matching, case studies were conducted to understand what was happening in the reservoir, and to predict how the performance should be if operation scheme was varied.<br>Performance of EOR such as CO2 flooding is dominated by fluid flow in target reservoir. It cannot be overstressed that the heterogeneity of target reservoir should be well recognized before commercial scale EOR technology is applied.

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