| 主权项 |
1. A downhole pumping assembly, comprising:
a) a tubing string extending a length into a well in the ground, the tubing string comprising tubing, a first barrel and a second barrel, the first barrel and the second barrel are arranged in-line with the tubing, with the first barrel closer to a surface of the earth than the second barrel, each of the first and second barrels having an inside diameter; b) the tubing string having plural seating locations, where the first barrel and the second barrel each have a respective seating location in the tubing string; c) a standing valve arrangement comprising a standing valve and a seating device, the standing valve located adjacent to a lower end of one of the first or the second barrel and coupled to the seating device, the seating device is coupled to the tubing string at the respective seating location of the one of the first or second barrel; d) a plunger with a traveling valve, the plunger is reciprocated by a sucker rod string from the surface of the earth to produce well fluid, the plunger located for reciprocation within the one of the first barrel or the second barrel; e) the plunger has a clearance with each of the first barrel and the second barrel so as to form a fluid seal between the plunger and the inside diameter of the one of the first barrel or the second barrel, the sucker rod string extending through the first barrel when the plunger is located for reciprocation in the second barrel to produce the well fluid. |
