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    PH sensitive graft copolymer
    3.
    发明授权
    PH sensitive graft copolymer 有权
    PH敏感接枝共聚物

    公开(公告)号：US08822605B2

    公开(公告)日：2014-09-02

    申请号：US13254630

    申请日：2010-03-05

    申请人： Ramesh Muthusamy ,  Mohan Gopalkrishna Kulkarni

    发明人： Ramesh Muthusamy ,  Mohan Gopalkrishna Kulkarni

    IPC分类号： C08F283/02 ,  C08F283/01

    CPC分类号： C08F283/01 ,  C08F220/06

    摘要： Graft copolymer (P) which exhibit pH dependent swelling/dissolution properties comprising a hydrophobic back-bone and graft chains comprising acidic monomer. This Graft copolymer (P) do not swell or dissolve at acidic pH prevalent in the stomach and they swell/dissolve at near neutral pH prevalent in the intestinal region. The graft copolymer (P) is useful for the development of drug delivery formulations particularly for oral drug delivery formulations.

    摘要翻译： 表现出pH依赖性溶胀/溶解性能的接枝共聚物（P），其包含疏水性背骨和包含酸性单体的接枝链。 这种接枝共聚物（P）在胃中普遍存在的酸性pH下不溶胀或溶解，并且它们在肠道中普遍存在的接近中性pH下溶胀/溶解。 接枝共聚物（P）可用于开发特别用于口服药物递送制剂的药物递送制剂。

    Controlled Release Breaker Composition for Oil Field Applications
    4.
    发明申请
    Controlled Release Breaker Composition for Oil Field Applications 有权
    油田应用的控制分解断路器组成

    公开(公告)号：US20130112413A1

    公开(公告)日：2013-05-09

    申请号：US13292304

    申请日：2011-11-09

    申请人： Ramesh Muthusamy ,  Prajakta R. Patil ,  Nisha A. Pandya

    发明人： Ramesh Muthusamy ,  Prajakta R. Patil ,  Nisha A. Pandya

    IPC分类号： E21B43/27 ,  C09K8/60

    CPC分类号： E21B43/267 ,  C09K8/685 ,  C09K8/80 ,  C09K8/92 ,  C09K2208/24 ,  C09K2208/26

    摘要： The present invention relates to encapsulated breakers and the use of encapsulated breakers for breaking viscosified treatment fluids. One embodiment of the present invention provides a method of providing a viscosified treatment fluid having a first viscosity having a gelling agent, a crosslinking agent, a proppant, an aqueous-base fluid, and an encapsulated breaker composition having an encapsulant that has a poly(meth)acrylate blend; introducing the viscosified treatment fluid in the subterranean formation; creating or enhancing a fracture in a subterranean formation; and allowing the encapsulated breaker composition to release the breaker so as to reduce the viscosity of the viscosified treatment fluid to a second viscosity.

    摘要翻译： 本发明涉及封装的破裂剂以及用于破坏增稠的处理流体的封装破碎剂的用途。 本发明的一个实施方案提供了一种提供具有第一粘度的增粘处理流体的方法，所述第一粘度具有胶凝剂，交联剂，支撑剂，含水基液和具有密封剂的包封破乳剂组合物，所述密封剂具有聚（ 甲基）丙烯酸酯共混物; 在地层中引入稠化处理液; 产生或增强地层中的断裂; 并且允许包封的破碎剂组合物释放断路器，以便将粘稠的处理流体的粘度降低到第二粘度。

    Graft copolymer with pH dependent behaviour
    6.
    发明授权
    Graft copolymer with pH dependent behaviour 有权
    具有pH依赖性的接枝共聚物

    公开(公告)号：US09012574B2

    公开(公告)日：2015-04-21

    申请号：US13582828

    申请日：2011-03-09

    申请人： Ramesh Muthusamy ,  Mohan Gopalkrishna Kulkarni

    发明人： Ramesh Muthusamy ,  Mohan Gopalkrishna Kulkarni

    IPC分类号： C08G63/91 ,  C08F283/01

    CPC分类号： C08F283/01 ,  C08F226/06

    摘要： A graft copolymer with pH dependent behavior of formula 1 Comprises, (i) a backbone having the formula 1 [A(X)B(Y)C(z)] wherein (A) is diol, (B) is dicarboxylic acid or acid anhydride and (C) is monomer containing pendent unsaturation such that (x)=41-45%, (y)=49-53% (z)=4-7% by mole; and (ii) a graft which is a polymer of the basic monomer (D) which comprises “w” weight percent of the total weight of said graft copolymer such that ‘w’ is 22-52%. The graft copolymers do not swell/dissolve at neutral and basic pH and swell/dissolve at acidic pH. The polymers are useful as protective coating for pharmaceutical dosage forms and as excipient in the development of extended release drug delivery systems.

    摘要翻译： 具有式1的pH依赖性行为的接枝共聚物包括：（i）具有式1 [A（X）B（Y）C（z）]的骨架，其中（A）是二醇，（B）是二羧酸或酸 酸酐和（C）是含有不饱和键的单体，使得（x）= 41-45％，（y）= 49-53％（z）= 4-7摩尔％ 和（ii）作为碱性单体（D）的聚合物的接枝物，其包含所述接枝共聚物总重量的“w”重量百分比，使得“w”为22-52％。 接枝共聚物在中性和碱性pH下不溶胀/溶胀，并在酸性pH下溶胀/溶解。 这些聚合物可用作药物剂型的保护性涂层和作为延长释放药物递送系统开发中的赋形剂。

    WATER-BASED DRILLING FLUID WITH CYCLODEXTRIN SHALE STABILIZER
    8.
    发明申请
    WATER-BASED DRILLING FLUID WITH CYCLODEXTRIN SHALE STABILIZER 有权
    基于水的钻井液与CYCLODEXTRIN SHALE STABILIZER

    公开(公告)号：US20140128295A1

    公开(公告)日：2014-05-08

    申请号：US13670636

    申请日：2012-11-07

    申请人： Vikrant Bhavanishankar Wagles ,  Dhanashree Gajanan Kulkarni ,  Ramesh Muthusamy

    发明人： Vikrant Bhavanishankar Wagles ,  Dhanashree Gajanan Kulkarni ,  Ramesh Muthusamy

    IPC分类号： C09K8/10

    CPC分类号： C09K8/10 ,  C09K8/032 ,  C09K8/08 ,  C09K8/12 ,  C09K8/5758 ,  C09K2208/12

    摘要： Well fluids and methods are provided that can be used for stabilizing a shale formation, especially during drilling of a well into or through a shale formation. The well fluids include: (i) a continuous water phase; (ii) a viscosity-increasing agent, wherein the viscosity-increasing agent comprises water-soluble hydrophilic polymer; (iii) a fluid loss control agent; and (iv) a cyclodextrin-based compound. The methods of drilling include the steps of: (A) introducing the well fluid into a zone of a subterranean formation; and (b) drilling the zone.

    摘要翻译： 提供了可用于稳定页岩形成的井液和方法，特别是在将钻井钻入或通过页岩层时。 井液包括：（i）连续水相; （ii）粘度增加剂，其中增粘剂包括水溶性亲水聚合物; （iii）流失控制剂; 和（iv）环糊精类化合物。 钻井方法包括以下步骤：（A）将井流体引入地下岩层的区域; 和（b）钻孔区域。