The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Jan. 17, 1978
Filed:
Nov. 26, 1976
L G Stump, Odessa, TX (US);
Sun Oil Company, Dallas, TX (US);
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 After the spot valve is pulled, the remaining tubing is withdrawn from the well.