公开(公告)号：EP0224298A3

公开(公告)日：1988-08-03

申请号：EP86201985

申请日：1986-11-13

申请人： DOWELL SCHLUMBERGER INC

发明人： NELSON, ERIK B.

IPC分类号： B01F13/08 ,  C04B14/30 ,  C04B14/34 ,  C04B28/02 ,  C04B40/02 ,  C09K8/42 ,  C09K8/46 ,  C04B22/06 ,  C04B40/00 ,  E21B33/13

CPC分类号： E21B33/13 ,  B01F13/0809 ,  B01F2215/0081 ,  C04B14/30 ,  C04B14/34 ,  C04B28/02 ,  C04B40/0209 ,  C09K8/42 ,  C09K8/46 ,  C04B24/2676

摘要： Novel cemetitious 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 binding 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 filed. 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.

摘要翻译： 公开了一种用于操纵用于固井的铁磁流体的新方法和装置。 水泥流体可以包括：（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。 当用于固井时，通过常规技术将水泥质铁磁流体嵌入在将井筒与地层中的地层分离的环形空间中，并且随后将该淤浆经受引起湍流运动的活化交变磁场。 非水泥质铁磁流体包括：（a）细碎的磁性颗粒，（b）稳定剂和（c）液体介质。 浆料的移动导致针对壳体和形成表面的表面的“擦洗”作用，以及有助于置换任何残留钻井泥浆的浆料的混合。 最终的结果是水泥与套管和地层的粘结更好。