Wells – Valves – closures or changeable restrictors – Longitudinally movable operator
Reexamination Certificate
2000-04-21
2002-02-19
Bagnell, David (Department: 3672)
Wells
Valves, closures or changeable restrictors
Longitudinally movable operator
C166S332700, C166S334300, C166S105000, C166S108000, C417S444000, C417S445000, C417S555200
Reexamination Certificate
active
06347668
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates generally to valves. More specifically, the invention is a relievable check valve assembly for oil or water wells comprising a check valve with a pin, a guide and triggers of various shapes.
2. Description of the Related Art
The relevant art of interest describes various check valve assemblies, but none discloses the present invention. There is a need for an efficient and inexpensive check valve for use in wells in order to drain fluid out of a plunger type pump and a string of tubing prior to pulling them out of a well. Removing the fluid, water or oil, and entrained debris from inside the tubing will greatly reduce the weight of the string of tubing and thus make the whole operation easier and safer. The relevant art will be discussed in the order of perceived relevance to the present invention.
U.S. Pat. No. 1,543,179 issued on Jun. 23, 1925, to Andrew Miller et al. describes a valve trip mechanism for bleeding the tubing of a deep well while the tubing is being extracted. When the working barrel is pulled toward the surface, an edge of the barrel contacts the head of a rod which shifts a lever. The lever operates a lift rod which pushes a ball valve out of its seat within the working barrel and allow fluid within the tubing to drain back into the ground and lessen the weight of the tubing being pulled out. The valve trip mechanism is distinguishable for utilizing a ball valve motivated by a pivoting lift rod consisting of three segments and a spring.
U.S. Pat. No. 1,314,070 issued on Aug. 26, 1919, to William H. McKissick describes a drainage valve for deep well pumps comprising a first embodiment of
FIGS. 1 and 2
drawn to two spaced collars on bowed springs which cause the opening of a ball valve in a thick coupling by pushing down a perforated sleeve against the ball and its compression spring. The second embodiment of
FIGS. 3 and 4
entails a standing ball valve resting on an apertured coupling in contact with a sliding double collared and outwardly bowed springs element and having an internal T-shaped bolt with extending arms. The arms immobilize the upper collar member having L-shaped arms by twisting prior to removal to cause the shaft of the T-shaped bolt to push up the ball and open the drain pipe. The drainage valves are distinguishable for requiring ball valves.
U.S. Pat. No. 4,856,756 issued on Aug. 15, 1989, to Linsey L. Combs describes a well bottom release valve assembly comprising a well bottom release valve axially aligned just above a down hole pipe. A short pipe section with a spring biased tight fitting sleeve is manually controlled from the surface by a cable to open drainage ports in the sleeve that allow the water contained within to drain out of the tubing above the down hole pump. The valve assembly is distinguishable for its above ground manual cable control element.
U.S. Pat. No. 1,660,486 issued on Feb. 28, 1928, to John A. Friend describes a drain valve for an inner tube of deep well pumps for drainage during removal of the inner tube from the well casing. A casing integrated with the tubing contains an elaborate mechanism which causes the opening of a drainage hole by movement of a plunger attached to a lever (and leaf spring) having a projection which catches in the space between two casings connected by a coupling. A cam lug of the lever pushes down the plunger against a ball valve under spring compression away from its seat. The drain valve mechanism is distinguishable for its numerous parts involving a lever, a plunger, a ball valve, and a lever.
U.S. Pat. No. 3,995,691 issued on Dec. 7, 1976, to Floyd R. Hedgecock et al. describes a tool for draining fluids in an oil well while removing a well conduit. An enclosure of an apertured tubular housing connected to a well conduit by two couplings permits drainage from the second bottom coupling when the pushrod attached to the fluid pump is uplifted. The tool is distinguishable for its apertured housing and couplings.
U.S. Pat. No. 4,637,471 issued on Jan. 20, 1987, to Paul B. Soderberg describes a tubing drain valve device useful with heavy sand-bearing oil and its method of use in a borehole. A first tubular member of a sub is connected to a pipe string in a casing with three dogs which engage the casing. A second tubular member surrounds an upper portion of the first tubular member and is attached by three shear pins and supported by a compression spring. As the pipe string is pulled up, the dogs contact the casing wall and cause the spring to compress for approximately three feet before the shear pins break and open slots for drainage of the fluid in the pipe string. The tubing drain valve device is distinguishable for its required dogs and shear pins.
U.S. Pat. No. 4,645,007 issued on Feb. 24, 1987, to Paul B. Soderberg describes a sub including a tubing drain valve and its method of use in a borehole. The sub comprising a tubular member is inserted in a pipe string by an upper connector and a lower connector and includes a tubular piston connected to a sucker rod. The tubular member has a C-spring with six bosses contacting the tubular member. Three dogs located inside the tubular member are positioned for contacting two semi-circular members on a lowermost position of the sucker rod to hold the uplifted pipe string in place to allow the fluid to drain through aligned ports in the tubular piston and the tubular member. The sub and tubing drain valve are distinguishable for requiring a C-spring with bosses, semi-circular holding members, a hollow piston, and dogs.
U.S. Pat. No. 4,782,895 issued on Nov. 8, 1988, to Jean-Luc Jacob et al. describes a pumped oil well bottom safety valve automatically closing when pumping stops and reopening when pumping resumes. A cylindrical valve body attached at the end of a production tube and below the valve pump has two cylindrical vertical channels. The first channel has a valve seat closed by a flap controlled by a lever and an orifice below the flap. The second channel is plugged on the bottom and the top with the top plug abutting a return spring. A push rod attached to the spring has a transverse second pressure valve and a notch for actuating the lever and flap. The bottom end of the push rod moves a piston closing an admission chamber having an orifice. The valve body is distinguishable for its numerous parts of a two-channelled body.
U.S. Pat. No. 5,310,005 issued on May 10, 1994, to William W. Dollison describes a flapper valve assembly with a floating hinge located between two pipe sections and used in oil and gas wells. A semicircular flapper body is supported by two pivoting struts and blocks a flow sleeve or can be folded behind the flow sleeve. The flapper valve assembly is distinguishable for its flapper and strut structure.
U.S. Pat. No. 5,425,416 issued on Jun. 20, 1995, to Michael N. Hammeke et al. describes a formation injection tool for down-bore in-situ disposal of undesired fluids. The oil and natural gas are expelled upwards in the upstroke of the pump and the mineral laden water is disposed underground in the lower disposal formations during the down stroke. The injection tool consists of three basic parts comprising an upper intake flow assembly, a middle seal mechanism and a lower discharge control device. The formation injection tool is distinguishable for its extensive structure.
Soviet Union Patent Application No. SU 1388-548 A published on Apr. 4, 1988, for Volg Oil Ind. describes an oil well expeller by using strata energy to drive a pump with its cylinder connected to an underground separator. The separator has two chambers with a piston and a poppet valve on a rod in the upper chamber and a compression spring and stop in a perforated lower chamber. Increasing pressure in upper chamber by the rising crude causes the piston to rise to close the poppet valve by the pressure difference. The crude enters the well tubing and up to decrease the pressure in the separator to move the piston down to expel the water through the perforations into t
Litman Richard C.
Walker Zakiya
LandOfFree
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