E - Fixed Constructions – 21 – B
Patent
E - Fixed Constructions
21
B
103/18, 166/35
E21B 43/24 (2006.01) E21B 36/00 (2006.01) E21B 43/12 (2006.01)
Patent
CA 1185519
ABSTRACT When pumping heavy type crude oil, several problems are encountered. The crude of 10 to 12 API gravity is very viscous, posing great lifting difficulties in that it requires considerable pressure to force it up the production tubing. In some cases when the tubing temperature drops below the normal 70 F (approx) the crude practically stops flowing, There is the added disadvantage in that the producing sands vary greatly in the amount of oil they produce. Considerable cost results when attempting to adjust the pump jack and pump to suit the rate of production of a particular well. Overproduction causes the pump to run dry resulting in costly workovers: underproduction is considered poor economics, particularly when good wells are capable of achieving five times as much production as marginal wells. This invention is intended to overcome these problems associated with the production of heavy crude. It related especially to a means of varying the RPM of the submersible pump so the pump lifts the crude at a rate compatible with the volume of crude produced by the oil bearing formation. It also relates to a means of heating the crude in the production tubing to make it less viscous and easier to lift. A third aspect of this invention is the use of endless tubing, for production tubing and for hydraulic power lines to drive the submersible pump motor.
404833
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