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    • 1. 发明申请
    • MODIFICATION OF SOLID POLYSACCHARIDE WITH TRANSESTERIFICATION AGENT
    • 固体多糖与改性剂的改性
    • WO2012052716A1
    • 2012-04-26
    • PCT/GB2011/001502
    • 2011-10-19
    • HALLIBURTON ENERGY SERVICES, INC.REDDY, Raghava, B.TURNER, Craig, Robert
    • REDDY, Raghava, B.
    • C09K8/08C09K8/40C09K8/514C09K8/90
    • C09K8/08C09K8/40C09K8/514C09K8/90
    • Polysaccharides, for example xanthan, diutan, scleroglucan, gums, celluloses, and starches, and derivatives of the foregoing, are reacted with organic carbonates forming products that: (1) have increased viscosifying efficiency, i.e., higher viscosities at reduced concentrations compared to the unmodified polysaccharide; or (2) are insolubilized at temperature ranges for which the unmodified polysaccharide would hydrate fully; or (3) both properties. In some cases, the insolubilized polysaccharides can be activated to dissolve and viscosify at specific temperature ranges by using pH modifiers. A method of treating a well is provided, including the steps of: (a) obtaining a modified polysaccharide characterized by having been made by the process of combining: (i) a water-soluble polysaccharide, wherein the polysaccharide is in a solid form during the combining step; and (ii) a transesterification agent, wherein the transesterification agent is in liquid form; wherein the step of combining is in the presence of less than 10% by weight water relative to the water-soluble polysaccharide and wherein any water present is at a pH of 8 or less; (b) forming a treatment fluid comprising the modified polysaccharide and water; and (c) introducing the treatment fluid into the well.
    • 将多糖,例如黄原胶,二硬脂酸,硬葡聚糖,树胶,纤维素和淀粉以及前述衍生物与有机碳酸酯反应,形成产物:(1)具有增加的增粘效率,即与浓度相比降低的浓度下的较高粘度 未改性多糖; 或(2)在未改性多糖将完全水合的温度范围内不溶; 或(3)两种性质。 在一些情况下,不溶性多糖可以通过使用pH调节剂被活化以在特定温度范围溶解和粘稠。 提供了一种处理井的方法,包括以下步骤:(a)获得改性多糖,其特征在于通过以下方法制备的:(i)水溶性多糖,其中多糖在固体形式期间 组合步骤 和(ii)酯交换剂,其中所述酯交换剂为液体形式; 其中组合步骤相对于水溶性多糖存在小于10重量%的水,并且其中存在的任何水的pH为8以下; (b)形成包含改性多糖和水的处理流体; 和(c)将处理​​流体引入井中。