Solubility of CO2 in crude oil and high-salinity formation water under high temperature and high pressure: Taking the Triassic reservoirs in a certain area of Tahe oilfield as an example
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摘要: 利用自行研制的高温高压CO2溶解度测定装置,在110 ℃、50 MPa条件下测试CO2在高矿化度地层水、原油以及非饱和油水共存状态下的溶解度。实验结果表明:地层水溶解二氧化碳气体量为26.5 m3/m3,复配原油溶CO2能力为134 m3/m3,在油水体积比为1∶1的条件下,注入的CO2在油水中的分配系数为9.23。Abstract: The solubility of CO2 in the presence of high-salinity formation water, crude oil and unsaturated oil-water system was tested at 110℃ and 50 MPa by using a self-developed high temperature and high pressure CO2 solubility measurement device. The experimental results showed that the formation water dissolved carbon dioxide gas amount of 26.5 m3/m3, and that of compound crude oil was about 134 m3/m3. When the oil/water volume ratio was 1:1, the partition coefficient of injected CO2 in oil and water was about 9.23.
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Key words:
- CO2 solubility /
- high temperature and high pressure /
- high salinity /
- Tahe oilfield
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