US 12,071,939 B2
Fluid end packing assembly
Richard David Peer, Fort Worth, TX (US)
Assigned to SPM Oil & Gas Inc., Fort Worth, TX (US)
Appl. No. 17/438,919
Filed by SPM Oil & Gas Inc., Fort Worth, TX (US)
PCT Filed Mar. 13, 2020, PCT No. PCT/US2020/022779
§ 371(c)(1), (2) Date Sep. 13, 2021,
PCT Pub. No. WO2020/186225, PCT Pub. Date Sep. 17, 2020.
Claims priority of provisional application 62/818,074, filed on Mar. 13, 2019.
Prior Publication US 2022/0186718 A1, Jun. 16, 2022
Int. Cl. F16J 15/3204 (2016.01); F04B 15/02 (2006.01); F04B 53/02 (2006.01); F04B 53/16 (2006.01); F04B 53/18 (2006.01); F16J 15/00 (2006.01)
CPC F04B 15/02 (2013.01) [F04B 53/02 (2013.01); F04B 53/164 (2013.01); F04B 53/18 (2013.01); F16J 15/006 (2013.01); F16J 15/3204 (2013.01)] 19 Claims
OG exemplary drawing
 
1. A seal packing assembly for a plunger disposed within an annular bore to pump a pumping fluid in a fluid end of a hydraulic frac pump, comprising:
a plurality of annular dynamic seals disposed within annular grooves circumferentially defined in the annular bore;
a packing gland circumferentially housing a section of the plunger; and
a plurality of seal manifolds distributed and defined within the packing gland, each seal manifold defining a port at one end exposed to the pumping fluid and further defining a clean lubrication fluid inlet proximate to a second end, the fluid inlet coupled to a lube pump via a check valve, where the clean lubrication fluid housed in the seal manifolds is maintained at a constant pressure, each seal manifold comprises:
a piston disposed within the seal manifolds having a first end configured with a first surface area to interface with the pumping fluid and a second end configured with a second surface area to interface with the clean lubrication fluid; and
a fluid port configured to provide fluid communication between the seal manifolds and the annular grooves of the annular dynamic seals.