High Volume Lift with Hydraulic Long Stroke Pumping Units
- P.L. Zuvanich (Continental Oil Co.)
- Document ID
- Society of Petroleum Engineers
- Publication Date
- Document Type
- 1959. Original copyright American Institute of Mining, Metallurgical, and Petroleum Engineers, Inc. Copyright has expired.
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Fifth Annual Joint Meeting of the Rocky Mountain Petroleum Sections of AIME,2-3 April, Casper, Wyoming
Hydraulic long stroke pumping units are not new, having been on the marketfor more than twenty years. However, most applications have been in Californiaand in the mid-continent area. There are still only a very few in use in theRocky Mountain Region.
Hydraulic long stroke units are well suited for high volume lift in deepwells, being capable of lifting nearly 1,000 B/D from 8,000 ft. There are manyplaces in the Rockies where they might profitably be used. It is the purpose ofthis paper to present the results of the application of two hydraulic longstroke pumping units to high volume lift in the Meadow Creek Tensleepreservoir, Johnson County, Wyo.
There are 13 wells in the reservoir completed in the Tensleep sand at anaverage depth of 9,000 ft. The produced crude is black, asphaltic, 31 API, andhas a solution gas-oil ratio of only 16 cu ft/bbl. The reservoir has an activewater drive with all wells producing some water. The discovery well wascompleted in March, 1952, and development was completed in June, 1955. Althoughinitially capable of flowing, all wells were being pumped by Feb., 1955.
During 1956, fluid withdrawals were increased by rung larger pumps in sixwells. Reservoir performance indicated that even greater withdrawals werepossible. In order to increase withdrawals, it was necessary to change surfaceequipment. A hydraulic long stroke pumping unit was installed to pump Well 98in April, 1957. In May, 1958, another was installed at Well 95.
Hydraulic Long Stroke Pumping Unit
A detailed description of the operation of the hydraulic pumping unit isbeyond the scope of this paper, but a brief discussion is pertinent.
On the upstroke, air pressure in the reservoir discharges the hydraulic oilto the pump where it is boosted to the underside of the piston. The pistonmoves up the cylinder with its load of rods and well fluid. On the downstrokethe weight of the rods and fluid force the hydraulic oil back to the pump whereit is boosted and discharged into the reservoir against the counterbalancingair pressure. A reversing valve makes the appropriate changes in the intake anddischarge of the pump at the top of the stroke and again at the bottom of thestroke.
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