Dual tubing pump for stimulation of oil-bearing formations

Wells – Processes – Vibrating the earth or material in or being placed in the...

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Details

1661771, 1661772, E21B 4325

Patent

active

060150106

ABSTRACT:
An apparatus for producing a shock wave in a borehole, such as a well, includes a pumping unit arranged at the wellhead, a tubing string extending downwardly into the production casing of the well, a hollow cylinder assembly connected with the bottom of the tubing string, and a pair of plungers arranged within the cylinder assembly and connected with the pumping unit with sucker rods and a polish rod for compressing liquid contained within the cylinder assembly and discharging the compressed liquid into the production casing, thereby generating a shock wave. The cylinder assembly includes a hollow upper cylinder, a hollow lower cylinder arranged below the upper cylinder, a crossover cylinder arranged between the upper and lower cylinders, and a compression cylinder containing a compression chamber arranged between the crossover cylinder and the upper cylinder. The lower cylinder has a larger inner diameter than the upper cylinder inner diameter, and the lower plunger has a larger diameter than the upper plunger. In addition, the lower cylinder is adapted to receive the lower plunger and the upper cylinder is adapted to receive the upper plunger. When the plungers are displaced upwardly in the cylinder assembly, the lower plunger travels into the compression chamber and the upper plunger travels out of the compression chamber. Due to the lower plunger having a greater diameter than the upper plunger, the volume of the compression chamber is reduced and the liquid contained therein becomes compressed. When the pumping unit reaches the top of its stroke, the lower plunger allows the compressed liquid contained in the compression chamber to be discharged into the well.

REFERENCES:
patent: 3209834 (1965-10-01), Essary
patent: 5586602 (1996-12-01), Vagin
Beresnev et al, Elastic-Wave Stimulation of Oil Production, Etc. Geophysics vol. 59, No. 6, Jun. 1994.

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