ADDITIVE FOR REDUCING TORQUE ON A DRILL STRING
    380.
    发明申请
    ADDITIVE FOR REDUCING TORQUE ON A DRILL STRING 审中-公开
    减少钻头扭矩的补充

    公开(公告)号:WO2006091562A8

    公开(公告)日:2007-11-01

    申请号:PCT/US2006006030

    申请日:2006-02-22

    Abstract: A method of reducing the torque of a drill string used in drilling a subterranean well that includes injecting into the drilling fluid a composition including a base fluid and a polymer coated colloidal solid material. The polymer coated colloidal solid material includes: a solid particle having an weight average particle diameter (d 50 ) of less than ten microns, and a polymeric dispersing agent coated onto the surface of the solid particle during the cominution (i.e. grinding) process utilized to make the colloidal particles. The polymeric dispersing agent may be a water soluble polymer having a molecular weight of at least 2000 Daltons. The solid particulate material may be selected from materials having of specific gravity of at least 2.68 and preferably the solid particulate material may be selected from barium sulfate (barite), calcium carbonate, dolomite, ilmenite, hematite, olivine, siderite, strontium sulfate, combinations and mixtures of these and other similar solids that should be apparent to one of skill in the art.

    Abstract translation: 一种减少用于钻探地下井的钻柱的扭矩的方法,其包括向钻井液注入包括基础流体和聚合物涂覆的胶体固体材料的组合物。 聚合物涂覆的胶态固体材料包括:重均粒径小于10微米的固体颗粒,以及涂覆在固体颗粒表面的聚合物分散剂 (即研磨)工艺用于制备胶体颗粒。 聚合物分散剂可以是分子量至少为2000道尔顿的水溶性聚合物。 固体颗粒材料可以选自具有至少2.68的比重的材料,并且优选固体颗粒材料可以选自硫酸钡(重晶石),碳酸钙,白云石,钛铁矿,赤铁矿,橄榄石,菱铁矿,硫酸锶,组合 以及这些和其他类似固体的混合物,其对于本领域技术人员应该是显而易见的。

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