US 12,480,392 B2
Hydraulic drive train for a frac pump
Jacob A. Bayyouk, Richardson, TX (US); Bryan C. Wagner, Aledo, TX (US); and Wesley P. Clark, Weatherford, TX (US)
Assigned to SPM Oil & Gas Inc., Fort Worth, TX (US)
Appl. No. 17/634,976
Filed by SPM Oil & Gas Inc., Fort Worth, TX (US)
PCT Filed Jul. 28, 2020, PCT No. PCT/US2020/043913
§ 371(c)(1), (2) Date Feb. 12, 2022,
PCT Pub. No. WO2021/030048, PCT Pub. Date Feb. 18, 2021.
Claims priority of provisional application 62/886,263, filed on Aug. 13, 2019.
Prior Publication US 2022/0290545 A1, Sep. 15, 2022
Int. Cl. E21B 43/26 (2006.01); F04B 9/10 (2006.01); F04B 11/00 (2006.01); F04B 17/05 (2006.01); F04B 23/06 (2006.01); F04B 49/10 (2006.01)
CPC E21B 43/2607 (2020.05) [F04B 9/10 (2013.01); F04B 11/0008 (2013.01); F04B 17/05 (2013.01); F04B 23/06 (2013.01); F04B 49/103 (2013.01)] 16 Claims
OG exemplary drawing
 
1. A hydraulic drive system transferring energy generated by a diesel engine to a frac pump, comprising:
a gearbox comprising a plurality of gears being coupled to and driven by the diesel engine to produce rotational movement;
at least one hydraulic pump coupled to at least one gear of the gearbox, and operable to, when driven by the rotational movement of the at least one gear of the gearbox, force a fluid at high pressure into at least one high-pressure fluid conduit;
at least one hydraulic motor coupled to the at least one high-pressure fluid conduit to receive the high-pressure fluid, and operable to transform energy in the high-pressure fluid into a rotational movement, which is used to power and drive a plurality of plungers in the frac pump;
at least one return fluid conduit operable to conduct low-pressure fluid from the at least one hydraulic motor back to the at least one hydraulic pump; and
at least one hydraulic accumulator coupled to a manifold, wherein the at least one hydraulic accumulator is coupled, via the manifold, to the at least one return fluid conduit at a downstream end of the at least one hydraulic motor and configured to maintain stable fluid pressure in the at least one return fluid conduit, wherein the at least one hydraulic accumulator comprises two hydraulic accumulators coupled to the manifold.