Welan gum was provided by BDL Chemical Company in China

Welan gum was provided by BDL Chemical Company in China. Other materials included NaCl, CaCl2, and distilled water. Crude oil for EOR tests was supplied by an oil company. The dead oil viscosity was 5.5 cP at 25 °C, and 3.1 cP at 85 °C. Viscosity was measured with a torque-type viscometer at varied temperatures and shear rates. Oil recovery was measured with core flooding equipment.

The test matrix is given in Table 1. For the first group of tests, WLG was added to water at different concentrations and the viscosity was measured at varied shear rates. For the second group of tests, NaCl was added to WLG solution to test its tolerance for sodium ions. For the third group of tests, CaCl2 was added to WLG solution to test its tolerance for calcium ions. Fourthly, WLG solution was aged at 85 °C for 6 h to test its stability under long-term heating.

Welan gum

welcome http://www.china-ebio.com/