Wells – Processes – Cleaning or unloading well
Patent
1978-09-15
1979-06-05
Novosad, Stephen J.
Wells
Processes
Cleaning or unloading well
166315, 417434, E21B 4300, F04B 2100
Patent
active
041571177
ABSTRACT:
A simplified means for draining oil well tubing to equalize the hydrostatic pressure of oil pumped up through the tubing with the oil in the annulus defined between the exterior of the tubing and the well casing is provided. Essentially, the pump barrel is extended beyond the lowermost point of reciprocation of the plunger in the barrel. A perforation is provided in the extended portion for communication between the well annulus and the interior of the extended portion. The polish rod connecting sucker rods to the plunger in the barrel in turn is treated to decrease its cross sectional area over a given length. This treated section of the polish rod is above the upper end of the pump barrel when the plunger is at its lowermost reciprocable position while pumping so that pumping operations can be carried out normally. When it is desired to dump the oil in the tubing to equalize the hydrostatic pressure, the plunger is lowered further than the lowermost point of reciprocation into the extended portion of the barrel by means of the sucker rods to bring the decreased cross sectional portion of the polish rod into a position partly extending into the pump barrel and partly above the pump barrel so that oil in the tubing can bypass the upper standing valve of the pump along the treated section of the polish rod to enter the barrel and extended portion and thence into the annulus.
REFERENCES:
patent: 2501237 (1950-03-01), Sanders
patent: 3168873 (1965-02-01), Huckaby
patent: 4047853 (1977-09-01), Huckaby
Novosad Stephen J.
Pastoriza Ralph B.
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