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    • 8. 发明授权
    • Well cementing in permafrost
    • 在永久冻土中固井
    • US4181533A
    • 1980-01-01
    • US8304
    • 1979-01-31
    • William N. Wilson
    • William N. Wilson
    • C04B28/06C09K8/20C09K8/46C04B7/32
    • C09K8/203C04B28/06C09K8/46
    • A process for cementing a string of pipe in the permafrost region of a borehole of a well wherein aqueous drilling fluid actually used in drilling the wellbore in the permafrost region of a wellbore is employed. The drilling fluid contains or is adjusted to contain from about 2 to about 16 volume percent solids. Mixing with the drilling fluid (1) an additive selected from the group consisting of ligno-sulfonate, lignite, tannin, and mixtures thereof, (2) sufficient base to raise the pH of the drilling fluid into the range of from about 9 to about 12, and (3) cementitious material which will harden in from about 30 to about 40 hours at 40.degree. F. The resulting mixture is pumped into the permafrost region of a wellbore to be cemented and allowed to harden in the wellbore. There is also provided a process for treating an aqueous drilling fluid after it has been used in drilling the wellbore in permafrost, and a cementitious composition for cementing in a permafrost region of a wellbore.
    • 一种用于在井的钻孔的多年冻土区域中固定管道的方法,其中采用实际用于钻井中多孔冻土地层中的井眼的钻井液。 钻井液含有或被调整为含有约2至约16体积%的固体。 与钻井液(1)混合,选自由木质素磺酸盐,褐煤,单宁及其混合物组成的组的添加剂,(2)足以使钻井液的pH升高到约9至约 12,和(3)将在40°F下硬化约30至约40小时的水泥质材料。将所得混合物泵入待接合的井眼永久冻土区域并使其在井眼中硬化。 还提供了一种在钻井液用于钻井永久冻土中的井筒之后处理含水钻井液的方法,以及用于在井筒的永久冻土区域中固井的水泥质组合物。