Analysis of the Influencing Factors on the Extraction of Residual Oil through the Gel Foam Flooding of Underground Reservoirs in the Tahe Oilfield.

Fractured-vuggy reservoirs are mainly composed of three types: underground rivers, vugs, and fractured-vuggy structures. Based on the similarity criterion, a 3D model can truly reflect the characteristics of the multi-scale space of a fractured-vuggy reservoir, and it can reflect fluid flow laws in the formation. Water flooding, gas flooding, and gel foam flooding were carried out in the model sequentially.

[Comparative analysis of ginsenosides from red ginseng].

Objective: To determine ginsenoside Rg1, Re, Rb1, Rc, Rb2, Rd from main root and root hair of red ginseng of different specifications.

Method: Ultrasonical extraction and reversed phase high performance liquid chromatography were applied.

Result: The total contents of six ginsenosides from main root 15 roots (percent 500 g), 20 roots, 30 roots and root hair are 1.