Method of and apparatus for cleaning down well valves of well pumps in situ

DETAILED DESCRIPTION Now with reference to FIG.
1, a vertical I-beam 1 supports auxiliary pumping mechanism and extends from base plate 2, which is portably mounted on the bed of a truck (which preferably includes a stabilizing jack not shown) so that the entire assembly may be moved adjacent well pump rod string 5 for attachment of split slip clamp 3 to the polish rod 4.
The hydraulic lift rod 6 by action of hydraulic cylinder 10 and its accompanying control system reciprocates clamp 3 over a range with control member 11 moving between lower mechanical stop 7 and an upper position determined by valve lever 12.
MOUNTING To mount the auxiliary pumping mechanism, pressure is removed from the hydraulic cylinder 10 by means of manual by-pass fluid valve 22, so that control member 11 moves downwardly into contact with stop 7.
Then the pump rod string 5 is lowered to the bottom of the pumping stroke by the top-side pumping mechanism (not shown) acting upon cable-clamp 23 at the top of polish rod 4.
Then, slip clamp 3 is secured to polish rod 4.
Control member 11 is adjustable on hydraulic lift rod 6 to conform with different pump string requirements and is adjusted so that stop 7 will support the weight of the rod system 5 just before the bottom of the pumping stroke is reached.
Then cable clamp 23 is removed to disconnect the pump rod string from the top side well pumping mechanism and to transfer the entire pumping control to the auxiliary pumping mechanism.
CONTROL SYSTEM The hydraulic system operates from fluid from hydraulic pump 8, driven by electric motor 9 and circulated through fluid surge tank 16 by way of hydraulic line routed to 16 and 10 (and connected to relief valve 18) and oil return piping 15.
Hydraulic control systems for pumps are known and disclosed in U.
S.
Pat.
Nos.
2,874,641 and 2,934,899 and may have different control circuits for achieving the purposes of this invention within the skills of those versed in the art.
However the mode of operation is hereinafter discussed so that the relationship of the control circuits and auxiliary pump mechanism as afforded by this invention are understood