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公开(公告)号：US20130065800A1
公开(公告)日：2013-03-14
申请号：US13626055
申请日：2012-09-25
摘要： Solid proppants are coated with a coating that exhibits the handling characteristics of a pre-cured 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 comprising a monofunctional alcohol, amine or amide. 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. Such proppants also form good unconfined compressive strength without use of an bond activator, are substantially unaffected in bond formation characteristics under downhole conditions despite prior heat exposure, and are resistant to leaching with hot water.
摘要翻译： 固体支撑剂涂覆有表现出预固化涂层的处理特性的涂层，同时还表现出在井筒内的升高的温度和压力下形成颗粒与颗粒的能力。 该涂层包括（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）包含单官能醇，胺或酰胺的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 。 这种支撑剂在没有使用粘结活化剂的情况下也形成良好的无侧限抗压强度，在井下条件下，即使预先暴露于热，也不会受到热水浸出的影响，基本上不影响结合形成特性。
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公开(公告)号：US20140162911A1
公开(公告)日：2014-06-12
申请号：US14015629
申请日：2013-08-30
IPC分类号： C09K8/80
CPC分类号： C09K8/805
摘要： Proppants for hydraulic fracturing of oil and gas wells have a polymeric coating that is strengthened with reinforcing particulates that are reactive with, or chemically bonded to, the polymeric proppant coating. Preferably, these particulates are added into the coating during the coating process. In one embodiment, functionalized particulates are used that become grafted into the polymer of the proppant coating through the chemical functionality imparted to the particulates. If non-functionalized particulates are used, a coupling agent is preferably added to enhance the bond strength between the added particulates and the polymeric matrix of the proppant coating.
摘要翻译： 用于油气井的水力压裂的支撑剂具有聚合物涂层，该聚合物涂层用与聚合物支撑剂涂层反应或化学键合的增强颗粒加强。 优选地，这些颗粒在涂覆过程中被加入到涂层中。 在一个实施方案中，使用通过赋予颗粒的化学功能而接枝到支撑剂涂层的聚合物中的官能化颗粒。 如果使用非官能化颗粒，则优选加入偶联剂以增强所添加的颗粒与支撑剂涂层的聚合物基质之间的粘结强度。
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