Application of copolymeric particulates for oilwell in-depth performance control

Abstract

The properties of two copolymeric particulates used for oilwell in-depth performance control were investigated systematically. The lab-scale studies showed that the average diameter of these particulates (E5 and G6) is 77.76 μm with the standard deviation of 2.16%. The two particulates exhibit good dilatability when immersed in 20 × 104 mg/L NaCl solution. Their capability of water retention (150 days) was 90% at 80°C. In addition, they exhibited good injectivity, driving performance and plug, and satisfied toughness index. The diffluence experiments confirmed that the coefficient of the profile modification were 85.7, 98.7, 86.1, and 98.1% when the permeability levels were 4.05 and 15.0, respectively. When using the two particulates, the average recovery ratio can reach 21%. The procedures mentioned earlier could be used as industry criteria to evaluate all kinds of particulate used as in-depth performance controllers. © 2006 Wiley Periodicals, Inc.