Patent ID: 9016373
Filing Date: 2015-04-28
Classification: E21B,H01F

Abstract:
1. A blowout preventer, comprising: a wellbore conduit portion; a magnet set including at least one magnet; and a magnetic fluid comprising a suspension of magnetic and/or magnetizable particles in a carrier liquid, wherein the magnetic fluid is selected from the group consisting of: a ferrofluid, a magnetorheological fluid, an inverse magnetorheological fluid, and/or combinations thereof, further wherein the wellbore conduit portion is connectable into fluid communication with a wellbore conduit, the wellbore conduit portion and the magnet set are sized, shaped, connected, structured and/or located so that a conduit sealing formation will form in the conduit portion when the following two conditions are met: (i) the magnet set is configured to generate a magnetic field, and (ii) the magnetic fluid is caused to flow in the wellbore conduit portion.