GB778489A - Deep well pumping apparatus - Google Patents

Abstract

778,489. Rotary motors and pumps. MARSHALL, S..T. E. Feb. 9, 1956, No. 4126/56. Class 110 (2). A deep-well pumping unit 11 comprises two or more gas or hydraulic motors 22, 23 and two or more pumps 26, 27 driven by the motors, motors and pumps being of the outwardly-sliding vane type. The unit is suspended in a well 10 and liquid is sucked up through a strainer 51 passing into a manifold 16 to the pumps, which discharge the liquid into a manifold 17, into which the motors 22, 23 also exhaust their working fluid. The two fluids mix and pass to the top of the well by way of tubing 12. The vanes of both motors and pumps are forced radially outwards by working fluid under pressure passing axially through the rotor 47 to the undersides of the vanes. Driving fluid is pumped from the land surface downwardly through tubing 10 to the inlets 20, 21 of the motors, by way of the manifold 15, entering the motor chambers 62 through ports 66 to drive the vanes 60. At the same time, fluid enters at each end of the rotor 47 by way of by-passes 56 in the motor cylinders and channels 54a of the bearings 54 to equalize the pressures on the ends of the rotor causing the latter to " float " during high-speed rotation. Part of the fluid is recirculated, after being cleaned. Each rotor 47 is provided with flats 69 so that the rotor is hexagonal in shape. The flats relieve fluid which would otherwise be trapped by the vane tips and the working chamber walls. From the pump 26, fluid is bled through an axial passage 77f from which part of the fluid moves through a lateral passage 77g in the rotor 47 into an annular groove 77h (not shown) in the wall of the rotor by way of an orifice 77i (not shown), to lubricate the surfaces between the rotor 47 and the sleeve 76 (not shown). After the manifold casing 11 has been submerged in the fluid of the well, the pump assembly 32 is lowered into the casing by means of a wire with a releasable coupling which engages a carrier 33. The various fluid chambers axially disposed along the assembly 32, are sealed from one another by bosses 35 containing grooves 36 (not shown) for O-shaped packing rings.