Wire-line retrievable, mechanically operated spot valve

Patent · Tue Jan 17 04:00:00 EST 1978

OSTI ID:6606374

Stump, L G

In order to accurately place a charge of chemical in an oil or gas well, tubing with a seating nipple affixed to its lower end is run to the desired depth of placement. The charge of chemical is introduced into the tubing, and a spot valve 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 upward 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 After the spot valve is pulled, the remaining tubing is withdrawn from the well. (6 claims)

• Assignee: Sun Oil Co
• Patent Number(s): US 4068712
• OSTI ID: 6606374
• Country of Publication: United States
• Language: English

Related Subjects

02 PETROLEUM
020300* -- Petroleum-- Drilling & Production
03 NATURAL GAS
030300 -- Natural Gas-- Drilling
Production
& Processing
45 MILITARY TECHNOLOGY, WEAPONRY, AND NATIONAL DEFENSE
450100 -- Military Technology
Weaponry
& National Defense-- Chemical Explosions & Explosives
CHEMICAL EXPLOSIVES
CONTROL EQUIPMENT
DESIGN
EMPLACEMENT
EQUIPMENT
EXPLOSIVE STIMULATION
EXPLOSIVES
FLOW REGULATORS
NATURAL GAS WELLS
OIL WELLS
STIMULATION
VALVES
WELL STIMULATION
WELLS