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    • 7. 发明申请
    • COATED AND CURED PROPPANTS
    • 包裹和固化的辅料
    • WO2013016158A1
    • 2013-01-31
    • PCT/US2012/047519
    • 2012-07-20
    • PREFERRED UNLIMITED, INC.MCDANIEL, RobertMCCRARY, Lloyd
    • MCDANIEL, RobertMCCRARY, Lloyd
    • B32B3/00
    • C09K8/805Y10S507/924
    • Solid proppants are coated with a coating that exhibits the handling characteristics of a precured coating while also exhibiting the ability to form particle-to-particle bonds at the elevated temperatures and pressures within a wellbore. The coating includes a substantially homogeneous mixture of (i) at least one isocyanate component having at least 2 isocyanate groups, and (ii) a curing agent. The coating process can be performed with short cycle times, e.g., less than about 4 minutes, and still produce a dry, free-flowing, coated proppant that exhibits low dust characteristics during pneumatic handling but also proppant consolidation downhole for reduced washout and good conductivity.
    • 固体支撑剂涂覆有表现出预固化涂层的处理特性的涂层,同时还显示出在井筒内的升高的温度和压力下形成颗粒 - 颗粒粘合的能力。 涂层包括(i)至少一种具有至少2个异氰酸酯基的异氰酸酯组分和(ii)固化剂的基本上均匀的混合物。 涂覆过程可以以较短的循环时间(例如小于约4分钟)进行,并且仍然产生干燥,自由流动的涂覆的支撑剂,其在气动处理期间表现出低灰尘特性,而且还支撑剂固结在井下以减少冲洗和良好的导电性 。