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    • 8. 发明授权
    • Novel ferrofluids for use in cementing wells
    • 用于固井的新型铁磁流体
    • US4691774A
    • 1987-09-08
    • US798527
    • 1985-11-15
    • Erik B. Nelson
    • Erik B. Nelson
    • B01F13/08C04B14/30C04B14/34C04B28/02C04B40/02C09K8/42C09K8/46E21B33/16
    • E21B33/13B01F13/0809C04B14/30C04B14/34C04B28/02C04B40/0209C09K8/42C09K8/46B01F2215/0081
    • Novel cementitious and non-cementitious ferrofluids are disclosed which have properties making them suitable for use in cementing wells. The cementitious fluids comprise: (a) a hydraulic cement, (b) finely divided magnetic particles, (c) a bonding agent or a surfactant, and (d) a liquid medium. The binding agent or surfactant is present in the compositions in an amount sufficient to render the compositions stable in a magnetic field. When used in cementing wells, the cementitious ferrofluids are implaced in the annulus separating a casing from the formation in a wellbore by conventional techniques and the slurry is subsequently subjected to an activating magnetic field that causes movement of the magnetic particles in the slurry. The non-cementitious ferrofluids comprise: (a) finely divided magnetic particles, (b) stabilizing agent, and (c) a liquid medium. The movement of the magnetic particles results in a "scrubbing" action against the surface of the casing and the formation and a mixing of the slurry which helps displace any residual drilling mud. The net result is better bonding of the cement.
    • 公开了具有使其适用于固井的性质的新型水泥质和非水泥质铁磁流体。 水泥流体包括:(a)水硬性水泥,(b)细碎的磁性颗粒,(c)粘合剂或表面活性剂,和(d)液体介质。 粘合剂或表面活性剂以足以使组合物在磁场中稳定的量存在于组合物中。 当在固井中使用时,水泥质铁磁流体通过常规技术嵌入到在井筒中将壳体与地层分离的环形空间中,并且随后使浆料经受使磁性颗粒在浆料中移动的活化磁场。 非水泥质铁磁流体包括:(a)细分磁性颗粒,(b)稳定剂和(c)液体介质。 磁性颗粒的运动导致对套管表面的“擦洗”作用,以及泥浆的形成和混合,这有助于置换任何残留的钻井泥浆。 最终结果是水泥的粘结更好。