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Effect of Displacement Pressure on Oil–Water Relative Permeability for Extra-Low-Permeability Reservoirs
ACS Omega ( IF 3.7 ) Pub Date : 2021-01-21 , DOI: 10.1021/acsomega.0c04987 Qing Liu 1 , Keliu Wu 1 , Xiangfang Li 1 , Bin Tu 1 , Wen Zhao 1 , Minxia He 1 , Qiukai Zhang 1 , Yunfei Xie 1
ACS Omega ( IF 3.7 ) Pub Date : 2021-01-21 , DOI: 10.1021/acsomega.0c04987 Qing Liu 1 , Keliu Wu 1 , Xiangfang Li 1 , Bin Tu 1 , Wen Zhao 1 , Minxia He 1 , Qiukai Zhang 1 , Yunfei Xie 1
Affiliation
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The oil–water relative permeability is an important parameter to characterize the seepage law of fluid in extra-low-permeability reservoirs, and it is of vital significance for the prediction and evaluation of the production. The pore throat size of extra-low-permeability reservoirs is relatively small, and the threshold pressure gradient and capillary pressure cannot be negligible. In this study, the oil–water relative permeability experiments with three different displacement pressures were carried out on the same core from the extra-low-permeability reservoir of Chang 4+5 formation in Ordos basin by the unsteady experimental method. The results show that the relative permeability of oil increases, while the relative permeability of water remains unchanged considering the capillary pressure and oil threshold pressure gradient compared with the JBN method. As the displacement pressure enlarges, the relative permeability of oil and water both increases; the residual oil saturation decreases, therefore the range of the two-phase flow zone is improved. Moreover, the isotonic point of water–oil relative permeability curves moves to the upper right region, and the reference permeability improves as well with the increasing pressure.
中文翻译：
特低渗透油藏驱替压力对油水相对渗透率的影响
油水相对渗透率是表征超低渗油藏流体渗流规律的重要参数，对于预测和评价产量具有至关重要的意义。超低渗透储层的孔喉尺寸相对较小，并且阈值压力梯度和毛细管压力不能忽略。本研究采用非定常实验方法，对鄂尔多斯盆地长4 + 5组特低渗透油藏在同一岩心上进行了三种不同驱替压力的油水相对渗透率试验。结果表明，油的相对渗透率增加，与JBN方法相比，考虑到毛细管压力和油阈值压力梯度，水的相对渗透率保持不变。随着位移压力的增大，油和水的相对渗透率都增加；剩余油饱和度降低，因此改善了两相流区的范围。此外，水油相对渗透率曲线的等渗点移至右上方区域，参考渗透率也随着压力的增加而提高。
更新日期：2021-02-02
中文翻译：
特低渗透油藏驱替压力对油水相对渗透率的影响
油水相对渗透率是表征超低渗油藏流体渗流规律的重要参数，对于预测和评价产量具有至关重要的意义。超低渗透储层的孔喉尺寸相对较小，并且阈值压力梯度和毛细管压力不能忽略。本研究采用非定常实验方法，对鄂尔多斯盆地长4 + 5组特低渗透油藏在同一岩心上进行了三种不同驱替压力的油水相对渗透率试验。结果表明，油的相对渗透率增加，与JBN方法相比，考虑到毛细管压力和油阈值压力梯度，水的相对渗透率保持不变。随着位移压力的增大，油和水的相对渗透率都增加；剩余油饱和度降低，因此改善了两相流区的范围。此外，水油相对渗透率曲线的等渗点移至右上方区域，参考渗透率也随着压力的增加而提高。
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