Wells – Pistons – fluid driven into well – With stop
Patent
1976-11-26
1978-01-17
Leppink, James A.
Wells
Pistons, fluid driven into well
With stop
166317, 166332, E21B 3316, E21B 4300
Patent
active
040687120
ABSTRACT:
In order to accurately place a charge of chemical in an old or established oil well or the like, tubing with a seating nipple affixed to its lower end is ran to the desired depth of placement, the charge of chemical is introduced into the tubing, and a spot valve according to the invention is placed into the tubing and pumped downhole until it is rammed home against the seating nipple, thereby expelling the chemical at the desired position in the well. The tubing is subsequently pulled upwardly for a few lengths, and the spot valve is then retrieved with a fishing tool. The spot valve includes a ball valve which is first held closed by a shear pin. The pin shears upon sufficient pull of the fishing tool to open the ball valve whereby the pressure is released across the ball permitting the spot valve to be retrieved with the fishing tool. After the spot valve is pulled, the remaining tubing is withdrawn from the well.
REFERENCES:
patent: 2776015 (1957-01-01), Bielstein
patent: 2854929 (1958-10-01), McGowen, Jr. et al.
patent: 2999545 (1961-09-01), Bigelow
patent: 3473609 (1969-10-01), Allen
patent: 3530935 (1970-09-01), Garrett
Hess J. Edward
Johnson Donald R.
Leppink James A.
Phillips James H.
Sun Oil Company
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