US 11,668,160 B1
Subsurface safety valve with recoupling magnet assembly
Kevin Robin Passmore, McKinney, TX (US); Bruce Edward Scott, McKinney, TX (US); and James Dan Vick, Jr., Mineral Wells, TX (US)
Assigned to Halliburton Energy Services, Inc., Houston, TX (US)
Filed by Halliburton Energy Services, Inc., Houston, TX (US)
Filed on May 18, 2022, as Appl. No. 17/747,820.
Int. Cl. E21B 34/10 (2006.01)
CPC E21B 34/105 (2013.01) [E21B 2200/05 (2020.05)] 18 Claims
OG exemplary drawing
 
1. A safety valve usable in a wellbore, the safety valve comprising:
a piston configured for displacing a flow tube;
a flapper valve;
the flow tube for opening the flapper valve;
a plurality of outer magnets attached to the piston, at least some of the plurality of outer magnets having a non-alternating polarity with respect to one or more adjacent outer magnets of the plurality of outer magnets; and
a plurality of inner magnets attached to the flow tube, at least some of the plurality of inner magnets having the non-alternating polarity with respect to one or more adjacent inner magnets of the plurality of inner magnets such that a first force to decouple the plurality of inner magnets from the plurality of outer magnets is higher than a second force to recouple the plurality of inner magnets to the plurality of outer magnets, wherein:
the plurality of outer magnets comprises a first outer magnet of a first size, a second outer magnet of a second size, and a third outer magnet of a third size;
the plurality of inner magnets comprises a first inner magnet of the first size, a second inner magnet of the second size, and a third inner magnet of the third size; and
the first size is different from the second size or from the third size.