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AVA International Corporation Patents
Assignee:
AVA International Corporation
Address:
Houston, TX
No. of patents:
31
Patents:












Patent Number Title Of Patent Date Issued
5513703 Methods and apparatus for perforating and treating production zones and otherwise performing rel May 7, 1996
There are disclosed methods and apparatus for perforating and treating zones of a well, as by hydraulic fracturing, stimulating and acidizing, and otherwise performing related activities within a well, wherein a plurality of perforating assemblies containing shaped charges are connec
5413173 Well apparatus including a tool for use in shifting a sleeve within a well conduit May 9, 1995
Well apparatus is disclosed in which a tool is lowered on a pipe string into a well conduit for shifting a sleeve slidably mounted within a tubular housing connected as part of the well conduit. The sleeve has vertically spaced grooves about its inner diameter, and the tool has latch
5358053 Subsurface safety valve October 25, 1994
There is disclosed a subsurface tubing safety valve having a normally closed flapper which is adapted to be moved to open position by a flow tube reciprocable within the body of the valve. The flow tube is urged to flapper opening position by hydraulic fluid from a remote source and is
5295907 Rorque limiting device March 22, 1994
A device for limiting the torque transmitted from a drive shaft to a driven shaft comprising a first body having a cylindrical portion and being adapted for rotation with one shaft and a second body having a cylindrical portion and being adapted for rotating the other shaft. The cylindri
5263847 Subsurface tubing safety valve November 23, 1993
There is disclosed a subsurface tubing safety valve of the type having a flapper swingable between an open position to one side of its bore and a closed position over a seat about its bore. A seal ring retained in a groove about the seat has a protruding lip which is initially engaged by
5251702 Surface controlled subsurface safety valve October 12, 1993
A surface controlled, subsurface safety valve in which a force due to control pressure fluid from a first source at the surface for opening the valve is opposed in part by a force due to reference pressure fluid from a second source at the surface, whereby the valve closes in response to
5195721 Fail safe valve actuator March 23, 1993
A fail safe valve actuator is disclosed that is powered by an electric motor. A valve stem with a helical groove is moved in one direction by a ball nut rotated by the electric motor to move a valve member to its operating position. The valve member is held in operating position by a
5193615 Apparatus for use in controlling flow through a tubing string suspended and packed off within we March 16, 1993
There is disclosed apparatus for use in controlling flow through a tubing string suspended and packed off within a well bore and within the annulus between the string and well bore above and below the packer by tools adapted to be lowered into and raised from landed positions within a
5137090 Subsurface tubing safety valve August 11, 1992
There is disclosed a subsurface tubing safety valve of the type having a flapper pivotally mounted in the bore of a tubular body disposable in a tubing string, and a flow tube vertically reciprocable within the bore of the body between an upper position permitting the flapper to close th
4852648 Well installation in which electrical current is supplied for a source at the wellhead to an ele August 1, 1989
There is disclosed a well installation having an electrically responsive device a substantial distance beneath the wellhead and apparatus for supplying electrical current to the device from a source of alternating or time varying current outside the wellhead, which apparatus includes an
4794989 Well completion method and apparatus January 3, 1989
There is disclosed apparatus for use in completing oil or gas wells having two or more perforated production zones which includes packers and assemblies for closing off the annular space between the tubing string and the well bore intermediate adjacent zones to isolate one from the other
4783046 Pneumatic valve actuators November 8, 1988
There is disclosed a pneumatic gate valve actuator adapted to move the gate of the valve between opened and closed position by the introduction of air pressure into or the exhaustion of air pressure from an expandable and contractible pressure chamber formed within a tire casing and betw
4776397 Tool for lowering into centered position within a well bore October 11, 1988
There is disclosed a tool which is adapted to be lowered and raised through a well conduit into and out of a centered position within a well bore beneath the lower end of the conduit. The tool has arms which are spring pressed toward outer positions for engaging the well bore, but held i
4768594 Valves September 6, 1988
There are disclosed two embodiments of a valve for closing a well conduit within a wall bore to flow therethrough automatically in response to the loss of a controlled condition. Each embodiment of the valve has means in which energy may be generated, in response to bleeding off of press
4745971 Multiple string well packer May 24, 1988
A multiple well string packer of the type wherein the packer is lowered into a well bore on one of the well strings, and the one string hung off from the wellhead so that the packer may be set at a desired level therein, and wherein the packer, when unset, is retrieved from the well
4726421 Latching devices February 23, 1988
There is disclosed a device for latching a well tool within the seal bore of a pocket to one side of a bore through a mandrel connectable in the well string. The mandrel has a recess above the seal bore to receive latching dogs on the lower end of collet fingers carried by the device and
4691893 Fail safe gate valves and actuators therefor September 8, 1987
There are disclosed several embodiments of a fail safe gate valve and actuator having means for yieldably urging the gate from one position to which it is moved under one or more controlled conditions to its other position upon failure of one such condition, means including a handwheel
4641707 Well apparatus February 10, 1987
Well apparatus is disclosed in which the bore through a lower tubular body adapted to be packed off and anchored within a well bore is opened and closed by a flapper pivotally mounted on the lower body and spring pressed toward closed position, and a flow tube mounted for reciprocation w
4640350 Kickover tool February 3, 1987
There is disclosed a kickover tool for use in running or pulling well tools respectively into or from a side pocket to one side of a bore through a mandrel connected as part of a well string.
4582135 Well packers April 15, 1986
There are disclosed two embodiments of a packer for closing off the annular space between a pipe string and a well bore in which the pipe string is disposed, each of which includes an annular packing element adapted to be expanded into sealing engagement with the well bore in response to
4540047 Flow controlling apparatus September 10, 1985
This application discloses apparatus in which a body means having a bore therethrough connected as part of a tubing string is packed off within a well bore, and means including a passageway in the body means by-passes the packer to connect the annulus about the tubing string above and be
4527631 Subsurface safety valve July 9, 1985
There are disclosed two embodiments of a subsurface safety valve having operating means which is responsive to the supply of control fluid from a remote source for holding a closure member in open position and which is retrievable separately from the closure member, so that with the bore
4522259 Well apparatus June 11, 1985
There are disclosed two embodiments of well apparatus each including a well tool adapted to be lowered into and locked within a landing nipple of a well string, together with a running tool adapted to be connected to the well tool for lowering it into locking position and then causing it
4519575 Valves and valve actuators May 28, 1985
There is disclosed a gate valve which is moved to open position by an extendible and retractable, fluid-operated actuator, and which is moved to closed position, upon exhaust of operating fluid, by coil springs which urge follower parts reciprocable with a stem on the gate, and which ext
4505332 Well packers March 19, 1985
There is disclosed a dual well string, hydraulically operated, retrievable packer in which one mandrel connectible with one well string is releasably connected to the body means of the packer to permit it to be lowered therewith, and the other mandrel connectible to the other well string
4505331 Side pocket mandrel March 19, 1985
There is disclosed a side pocket mandrel having upper and lower sections which are adapted to be connected to a well tubing string and which have lower and upper ends, respectively, which are coaxial with one another but with respect to the axes of their upper and lower ends, and an
4477104 Releasable latching apparatus October 16, 1984
There are disclosed two embodiments of an apparatus for releasably latching the lower end of a tubing string within the bore of an upstanding well conduit by means of latching parts adapted to be received in latching position beneath a shoulder in the bore of the well conduit. The latchi
4440223 Well slip assemblies April 3, 1984
There is disclosed an hydraulically set well packer wherein sleeves carried about a tubular member which is connected as part of a tubing string are adapted to be moved from axially extended to axially retracted position in order to expand packing and slip elements carried about one of t
4434847 Flow controlling apparatus March 6, 1984
There is disclosed apparatus for controlling flow through both a tubing string suspended within a well bore and the space within the well bore about the tubing string. The illustrated embodiment of the apparatus comprises a body made up of a pair of mandrels and having a first bore t
4398600 Systems for landing wire line tools at selected levels within a well tubing string August 16, 1983
There is disclosed, for use in a system for landing wire line "no go" tools at selected levels within a tubing string, a landing nipple connectible in the tubing string and in which either a top or a bottom "no go" tool may be landed.
4325431 Flow controlling apparatus April 20, 1982
There is disclosed a subsurface safety valve having a closure member which is yieldably urged to a position closing a bore through a mandrel connected as a part of a well tubing string, but adapted to be opened by means of a piston carried by a wire line retrievable tool landed within a

 
 
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