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    • 1. 发明授权
    • Method for fracturing coal seams
    • 煤层压裂方法
    • US4995463A
    • 1991-02-26
    • US532830
    • 1990-06-04
    • Robert C. KrammRobert H. Lane
    • Robert C. KrammRobert H. Lane
    • C09K8/62E21B43/00E21B43/267
    • E21B43/267C09K8/62E21B43/006
    • Method for fracturing coal seams to improve the production (e.g. methane and/or water) therefrom. A water-based fracturing fluid is injected into the coal seam under pressure wherein the fracturing fluid contains both a wetting agent and a dispersant. The wetting agent contacts the fines which are formed during the fracturing of the coal and converts them from "hydrophobic" to "hydrophilic" while the dispersant serves to disperse and suspend the fines within the fracturing fluid. This prevents early screen-out of the fines from the fracturing fluid which allows the fluid to propagate fractures of longer lengths into a coal seam before the fines settle out to block further flow through a fracture.
    • 压裂煤层以改善生产(例如甲烷和/或水)的方法。 在压力下将水基压裂液注入煤层,其中压裂液含有润湿剂和分散剂。 润湿剂接触在煤的压裂过程中形成的细粉,并将它们从“疏水”转变为“亲水”,而分散剂用于将细粒分散并悬浮在压裂液中。 这防止了从压裂液中早期筛选出细粉,这允许流体在细粉沉淀出来以阻止进一步流过裂缝之前使较长长度的裂缝传播到煤层中。
    • 4. 发明授权
    • Coal-aqueous slurry
    • 煤 - 水浆
    • US4645514A
    • 1987-02-24
    • US515829
    • 1983-07-21
    • Robert H. Lane
    • Robert H. Lane
    • C10L1/32C10L10/18
    • C10L1/326Y10S516/01
    • Coal-aqueous slurries having improved shear stability and lower viscosity are described. The use of a plurality surfactants each having hydrophilic portion with each surfactant hydrophilic portion having a different molecular weight are utilized in sufficient amounts to wet and disperse particulate coal and water. When two surfactants are utilized, coal-aqueous mixtures may be formulated having up to or over 70% by weight coal when the first surfactant has a hydrophilic portion comprising a relatively large number of ethylene oxide units and the second surfactant has hydrophilic portion comprising a relatively small number of ethylene oxide units.
    • 描述了具有改进的剪切稳定性和较低粘度的煤 - 水浆料。 使用具有亲水部分的多个表面活性剂,每个具有不同分子量的表面活性剂亲水部分用量足以湿润和分散颗粒状煤和水。 当使用两种表面活性剂时,当第一表面活性剂具有包含相对大量环氧乙烷单元的亲水部分时,煤 - 水混合物可以配制成具有至多或超过70重量%的煤,并且第二表面活性剂具有亲水部分,其包含相对 少量环氧乙烷单元。