US 11,884,872 B2
Magnetorheological fluids and methods of using same
Eric Van Oort, Austin, TX (US); Kenneth M. Cowan, Austin, TX (US); Sriramya Duddukuri Nair, Austin, TX (US); and Raissa Ferron, Austin, TX (US)
Assigned to BOARD OF REGENTS, THE UNIVERSITY OF TEXAS SYSTEM, Austin, TX (US)
Filed by Board of Regents, The University of Texas System, Austin, TX (US)
Filed on Nov. 16, 2020, as Appl. No. 17/098,567.
Application 17/098,567 is a division of application No. 14/329,436, filed on Jul. 11, 2014, granted, now 10,836,949.
Prior Publication US 2021/0139762 A1, May 13, 2021
Int. Cl. E21B 33/13 (2006.01); C09K 8/46 (2006.01); C04B 28/02 (2006.01); C09K 8/03 (2006.01); C09K 8/516 (2006.01); C09K 8/40 (2006.01); C09K 8/467 (2006.01)
CPC C09K 8/46 (2013.01) [C04B 28/02 (2013.01); C09K 8/032 (2013.01); C09K 8/40 (2013.01); C09K 8/467 (2013.01); C09K 8/516 (2013.01); E21B 33/13 (2013.01); C09K 2208/08 (2013.01)] 12 Claims
OG exemplary drawing
 
1. A magnetorheological cement, comprising:
a hydraulic cement comprising a plurality of cement particles; and
a plurality of magnetic particles, wherein a mean minimum dimension of the plurality of magnetic particles is from 2-200 micrometers, wherein a concentration of the plurality of magnetic particles in the magnetorheological cement is from 15-70% by weight of the hydraulic cement, and
wherein a mean particle size ratio between the plurality of magnetic particles and the plurality of cement particles is from 4:1 to 1:4.