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Publication numberUS3071151 A
Publication typeGrant
Publication dateJan 1, 1963
Filing dateNov 5, 1958
Priority dateNov 5, 1958
Publication numberUS 3071151 A, US 3071151A, US-A-3071151, US3071151 A, US3071151A
InventorsSizer Phillip S
Original AssigneeOtis Eng Co
Export CitationBiBTeX, EndNote, RefMan
External Links: USPTO, USPTO Assignment, Espacenet
Pressure responsive control valve for well tubing
US 3071151 A
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Description  (OCR text may contain errors)

P. S. SlZER PRESSURE RESPONSIVE CONTROL VALVE FOR WELL TUBING Jan. 1, 1963 Filed Nov. 5. 1958 R m m W F w Fig.2

Fig.1

F. e p. l S p m DI ATTORNEY United States Patent 3,071,151 PRESflURE RiESiPflNfllVE CONTRQTL VALVE FQR WELL TUBING Phillip S. Sizer, Dallas, TexL, assignor to Gris Engineering Qorporation, Tern, a corporation of Delaware Filed Nov. 5, 1958, Ser. No. 772,330 14 Claims. (61. 137-496} This invention relates to well tools and more particularly to an improved pressure responsive flow control device for controlling the flow of fluids through a flow conductor, such as a well tubing.

One object of the invention is to provide a new and improved control device for use in a well flow conductor which is responsive to the fluid pressure within the conductor for controlling flow of fluids therethrough, and having a valve structure which is protected against cutting action of flowing fluids while the valve is open.

A further object of the invention is to provide a control device of the character described which is designed to automatically shut off flow of fluid through the well flow conductor in which it is installed when the pressure of the fluids flowing through the conductor drops below a predetermined value, and which is designed so that the valve can be opened atter it has closed to permit the resumption of flow of fluids through the conductor.

Another object of the invention is to provide a well flow control device of the character described having a flow control member therein in the form or" a movable valve element which is biased toward a closed position and which is moved to an open position by the pressure of the well fluid in the flow conductor, and wherein the device is provided with positive stops for limiting longitudinal movement of the movable valve member.

An important object of the invention is to provide a flow control device adapted to be positioned or secured in a well flow conductor to shut oil flow of fluids through such well conductor when the pressure of the fluids in the conductor drops below a predetermined value, the valve element being biased toward a closed position by a fluid pressure medium acting on the movable element, and to provide such a control device wherein the construction and arrangement of the valve elements is such that the valve will close even though the pressure fluid acting to bias the valve member toward closed position should vary because of failure of the sealing elements of the pressure chamber.

Another object of the invention is to provide a flow control device of the character described wherein the flow through the valve is rectilinear in its direction so that the fluids flowing through the valve do not tend to cut or wear away the valve elements rapidly.

A particular object of the invention is to provide a valve for use in a control device of the character set forth wherein both the valve closure element and the valve seat against which the closure element acts are protected against the cutting action of fluids flowing through the valve assembly during flow of such fluids, and are only exposed to the action of the flowing fluids when the valve is being moved to the closed position.

Another object of the invention is to provide a flow control device of the character described wherein the pressure at which the valve will close may be adjusted by adjustment of the fluid pressure medium acting on the movable valve element.

Additional objects and advantages of the invention will be readily apparent from the reading of the following description of a device constructed in accordance with the invention and reference to the accompanying rawings thereof, wherein:

FlGURE l is a view partly in elevation and partly 3,fl7l,l.5i Patented darn. l, 1963 in section of the upper portion of a control device constructed in accordance with the invention;

FIGURE 2 is a view partly in elevation and partly in section of the lower portion of the control device of the FlGURE 1 showing the valve element in open position;

FIGURE 3 is a view similar to FIGURE 2 showing the valve element in closed position; and

FiGURE 4 is a fragmentary view, partly in elevation and partly in section showing the flapper valve of the control device in an intermediate position between its closed and open positions.

in the drawings, the numeral 2% designates a flow control device for controlling the flow of well fluids through a well conductor, such as the usual well tubing (not shown). The control device 2% may be connected at its upper end to the screw threaded lower end of a hanger and sealing tool Zill by means of which the control device may be lowered into and anchored in the well tubing for the purpose of controlling flow through such tubing. The hanger and sealing tool may be of any suitable design, such as, for example, the patent to Marshall and Fredd, 2,698,056, wherein the anchoring and sealing member is positioned at and locked in sealing engagement in a special landing nipple in a well tubing string, or may be an anchoring and sealing device of the character illustrated in the patent to H. C. Otis, 2,784,789, wherein the locking mechanism is designed to be anchored at any position in a well flow conductor and the sealing element may be moved into sealing engagement with such well flow conductor to direct flow through the valve element attached to the anchoring and sealing mechanism.

The control device 2% includes an outer tubular member 263 which comprises an upper sub 214, a sleeve 215 threaded on the lower reduced end of the upper sub 21 and a tubular plug 216 threaded in the lower end of the sleeve 215. A spring biased inwardly closing equalizing valve 2% having a nose portion 292a projecting into the bore of the upper sub 214 may be incorporated in the upper sub for the purpose of opening the valve as will be hereinafter more fully described.

The outer sleeve 215 is provided with an internal flange 217 intermediate its ends having an internal annular recess 21% in which an annular seal member 219 and cooperating Ci-ring 226 may be disposed. The seal member engages the external surface of an elongate tubular valve element or sleeve 225 which is slidable longitudinally within the outer sleeve to seal between said outer sleeve and said valve sleeve 225. The valve element or sleeve 225 is telescoped in the outer sleeve 21S and is provided at its upper end with an external annular piston flange 23%), disposed above the flange 217 and having an external annular recess 231i therein. Au annular seal member 232 and a cooperating O-ring 233 are disposed in the recess 231 and the seal member is biased outwardly into sealing engagement with the internal wall surface of the outer sleeve 215 to seal between the valve element flange and said outer sleeve.

The seal members 21d and 232 provide a fluid tight eal between the valve element 225 and the outer sleeve 215 whereby a gas tight chamber 235 is provided between the valve element 225 and the sleeve 215 and between the flanges 217 and 239. A charge of gas may be introduced or injected into the chamber 235 through the ports 237 and 238 of the outer sleeve. The port 237 communicates with the interior of the outer sleeve above the seal member 219 so that any gas introduced into the lateral port 237 may flow upwardly between the internal surface 244! provided by the flange 217 and the external wall surface of the valve element into the chamber 235.

The port 237 may be closed by means of a plug 242, threaded in an enlarged bore 243 of the sleeve 215, which compresses a gasket 244 against the annular shoulder m3 245 adjacent the lateral port 237. The angularly extending port 238 of course may communicate with the port 217 only when the plug 242 is screwed outwardly. Gas may be injected into the port 233 by means of a suitable fitting, not shown.

A spring 25% may be disposed in the chamber 235 with its opposite ends bearing against the downwardly facing shoulder 251 of the external flange 230 of the valve element 225 and against the upper annular shoulder 252 of the sleeve 215. It will be apparent that the spring 256 and the charge of gas in the chamber 235 bias the valve element to an upper closed position.

The valve element 225 is provided at its lower end with an annular valve seat 255 which, when the valve is in its lower open position, abuts the upwardly and inwardly inclined annular protective surface 256 of the plug 216 which protects the valve seat against undue wear by fluids flowing through the outer tubular member by way of the bore 260 of the outer tubular member 283 and the bore 261 of the valve element 225.

It will be apparent that since the upper ends of the sleeve and of the external flange 230 are exposed to the pressure of the well fluids flowing through the bores 26 and 261, when the control device 210 is positioned in a well flow conductor, or well tubing (not shown), fluid pressure present in the tubing will pass upwardly around the sealing element of the hanger and sealing tool and enter the bore of such tool, from whence it will also enter the upper end of the outer sleeve 215 and act downwardly on the flange piston 23%. If the fluid pressure so entering the upper end of the outer sleeve is sufficiently high, the valve member Will be moved downwardly to open position. After the control device has been anchored or secured in locked sealing position in the tubing, the valve member 225 will be held in the lower open position illustrated in FIGURE 1 against the combined forces of the spring 258 and of the charge of the gas so long as the fluid pressure exceeds the predetermined value for which the spring and gas charge in the chamber 235 are set.

When the valve element 225 is moved upwardly by the combined forces of the spring and of the charge in the chamber 235 due to the fall of the pressure of the well fluids in the tubing above the control device below the predetermined value, a flapper valve 27% having a beveled seal surface 271 on a valve body 272 is pivoted upwardly into engagement with the lower end of the valve element to close the bore 261 of the valve element by the engagement of the annular beveled surface 271 of the flapper valve with the valve seat 255 at the lower end of the valve element. The flapper valve is disposed in a lateral longitudinal slot 273 formed in the wall of the sleeve 215, and is retained therein by a shaft 275 which extends outwardly from the upwardly extending integral arm 276 of the body 272 of the flapper valve 279 into aligned vertical slots 277 in the sleeve which extend outwardly from the slot 273. The shaft 275 extends through a suitable transverse bore in the arm 276 and is rigidly secured therein by means of a set screw 28% threaded in the arm.

The arm 276 is also provided with a bell crank or lever lug 282 which extends at a right angle with respect to the arm. The outer end of the lug extends into an external annular recess 283 on the lower end of the valve element 225. The external annular recess 283 provides an annular upwardly facing trip shoulder 235 which is adapted to engage the downwardly facing shoulder 286 formed by the underside of the lever lug 282 to pivot the flapper valve 270 in an upwardly swingingmanner when the valve element 225 is moved upwardly. Such movement of the flapper valve 279 causes the flapper valve body 272 to move into the upward flowing stream of fluids and thus into engagement with the lower end of the valve element 225, which is now disposed above the valve body 272, the beveled shoulder 271 engaging the valve seat 255.

The upward movement of the valve element 225 is stopped or limited by engagement of the upper end of said valve element with the lower end of the upper sub 214, and the shaft 275 is movable vertically in the slots 277 to permit proper adjustment of the valve body relative to the valve seat 255 into seated sealing position. It is apparent that the upwardly flowing stream of well fluids urges the valve body upwardly into engagement with the lower end of the valve element 225 whereby, when the valve element 225 is moved upwardly due to the decrease in the pressure of the well fluids flowing through the valve element, the flapper valve will be pivoted into the stream of fluids and then moved by such stream into engagement with the lower end of the valve element. The pressure of the well fluid will hold the flapper valve in the closed position illustrated in FIGURE 3, preventing flow of well fluids through the flow control device 214).

It will be particularly noted that should the seals holding the fluid pressure charge in the chamber 235 leak or for any reason, the higher well pressure will enter the chamber 235, substantially equalizing pressures on both sides of the piston flange 230, so that the spring 256 will move the movable valve element 225 upwardly toward closed position, thus causing the valve to close prematurely. The valve will close at substantially the time at which the higher pressure of the well fluids entering the chamber 235 plus the force of the spring equals or slightly exceeds the downward force of the pressure of the well fluids acting downwardly on the upper end of the piston flange 236 at the upper end of the valve sleeve or element 225, rather than at the lower pressure predetermined by the charge in the chamber 235. This operation of the valve provides an additional desirable factor of safety, since the valve will thus positively close prematurely and warn the operator of the failure of the seals 219 or 232, as the case may be. Thus, the control device may be removed, the seals replaced and the chamber recharged, to again effect closure of the control device at the desired predetermined pressure condition in the well. But in any event, the valve of the control device will always close to prevent an undesired escape of well fluids from the well tubing, should the surface controls or flow lines be damaged in such a manner as to permit an escape of fluids fro-m the tubing resulting in a reduction in the pressure of the fluids in the tubing above the Well device to the predetermined value for which the control device is set.

The valve element 225 and flapper valve 270 will move back to their open positions, illustrated in FIGURE 2, only when the pressure above and below the flapper valve is equalized and such equalization of pressure may be accomplished by the opening of the valve 201 in the upper sub 214 to admit fluid pressure from below the control device into the bore of the sleeve 215, whereupon, after suflicient fluid pressure has been admitted, the flapper valve will move downwardly and outwardly, due to its own weight, out of engagement with the valve seat 255. Simultaneously, the pressure exerted on the upper end of the valve element 225 and the piston flange 230, if the pressure of the valve fluids is above the predetermined value, will cause the valve element to again move downwardly to the open position illustrated in FIGURE 2 against the resistance of the spring 250 and the charge of gas in the chamber 235.

It will thus be seen that the control device 200 includes an outer tubular member 2G3, an inner tubular valve element 225 slidably mounted in the outer tubular member for limited longitudinal movement therein, since upward movement of the valve element is limited by the engagement of the upper end of the valve element with the lower end of the upper sub 214 and downward move-- ment thereof in the outer tubular member 233 is limited by the engagement of the seat 255 at the lower end of said valve element with the inclined annular surface 256 at the upper end of the tubular plug 216 when the valve; element is in its lower position.

It will further be seen that the tubular member is provided with a valve means which is movable into engagement with the lower end of the valve element to close the longitudinal bore 261 thereof upon upward movement of the valve element in the outer tubular memher 2%.

It will also be apparent that a valve 270 is pivotally mounted on the outer tubular member 263, and that the valve and the valve element 225 are provided with coacting means which pivot the valve 278 into the flowing stream of well fluids which then move the valve into engagement with the valve seat 255 upon upward movement of the valve element in the outer tubular member 2%.

It will likewise be seen that the sealing surfaces of the valve seat 255 and of the valve body 270 are, when not coengaged, protected against wear since the valve element seat 255 abuts the upwardly inclined protective surface 256 of the plug 216 and is thu disposed out of the stream of flow of well fluids, while the surface 271 of the valve body 27%? is, when in open inoperative position, disposed in the outer sleeve 215 outwardly of the valve element 225, also out of the stream of flow of the valve fluids.

It is also readily apparent that a new and improved flow control device has been illustrated and described which is provided with a longitudinally movable valve element and a cooperating flapper valve, which when in their upper closed position, prevent flow of well fluids through the outer tubular member, and which when in their lower open position, permit such flow of well fluids through the tubular valve member, and thus through the well tubing past the anchoring and sealing means.

it will further be apparent that the valve elements of the flow control device are so disposed that the flow of fluids through the tubular valve element is rectilinear, without turns or changes in direction of flow, and that the seating and sealing elements of the tubular valve element and of the flapper valve element are protected against the cutting action of the well fluids flowing through the control device, since the inclined protective surface at the upper end of the tubular plug 216 directs flow past the seat at the lower end of the valve element, and all flow when the valve is open is directed past the flapper valve.

it is also apparent that the flow control device is provided with means for opening the same after it has been closed, that such opening may be accomplished by means of the insertion of a suitable tool into the well tubing from the surface to engage the equalizing valve 291 to admit fluids into the well tubing above the valve elements in suflicient amount to open the valve. Likewise, fluid may be introduced from an extraneous source into the tubing at the surface to raise the pressure in the tubing to a value in excess of the predetermined pressure at which the valve will open.

The foregoing description of the invention is explanatory only, and changes in the details of the constructions illustrated may he made by those skilled in the art, within the scope of the appended claims, without departing from the spirit of the invention.

What is claimed and desired to be secured by Letters Patent is:

l. A Well flow control device including: a tubular outer member; a tubular valve element longitudinally movably mounted in said tubular outer member and having a valve seat at its lower end; a valve closure means connected to said tubular member also movably mounted in said tubular member and engageable with the valve seat at the lower end of said tubular valve element to close the same; means in said tubular outer member biasing said tubular valve element longitudinally therein to a position wherein said seat is closingly engaged by said valve closure means to prevent flow of fluids through said outer tubular member comprising a fixed predetermined charge of gaseous pressure confined within said outer member and acting upon said tubular valve element to move said valve element toward such closed position upon the occurrence of a predetermined pressure condition within the bore of said tubular member above said valve element, such gaseous pressure charge controlling the pressure conditions under which the valve element will be moved to ward closed position; and means on said valve element responsive to fluid pressure of the fluids flowing through said tubular outer member and within the tubular member downstream of the valve element for moving the valve element longitudinally in said tubular member to a position out engagement with said valve closure means to permit flow of fluids through said tubular valve member, whereby the pressure of the fluids flowing through said valve member acts thereon to hold the same in open position.

2. A well flow control device including: a tubular outer member; an elongate tubular valve element longitudinally movably mounted in said outer tubular member and hav ing a valve seat at its lower end; a valve closure member connected to said outer tubular member swingably mounted in said outer tubular member and engageable with the valve seat at the lower end of said tubular valve element to close oit flow through said outer tubular memer; means in said outer tubular member biasing said valve element longitudinally of said tubular member comprising a fixed predetermined charge of gaseous fluid confined within said tubular member and acting on said valve element for moving the same to a position in Which said closure member engages the valve member to close off flow through the outer tubular member; and means on said valve element responsive to fluid pressure of the fluids flowing through said tubular outer member and within the tubular member downstream of the valve element for moving the valve ele- .ent longitudinally against the resistance of said biasing means to move the closure member out of closing engag ment with the seat at the lower end or" said valve element to permit flow of fluids upwardly through the valve element, such downward movement of the valve element moving the closure member to a position in which the closure member cannot engage the valve element to close off flow through the outer tubular member.

3. A well flow control device including: a. tubular outer member; an elongate tubular valve element longitudinally movably mounted in said outer tubular member and having a valve seat at its lower end; means in said tubular member comprising a predetermined fixed gaseous pressure charge confined within said tubular member and acting on said valve element biasing said valve element longitudinally therein to a first position in said tubular member; a valve closure member connected to said tubular outer member movably mounted in said tubular outer member and engageable with the valve seat at the lower end of the valve element to close oif flow through the tubular member when said valve element is in said first position; and means on said valve element responsive to fluid pressure of the fluids flowing through said tubular outer member and within the tubular member downstream of the valve element for moving the valve element longitudinally in said tubular member against the resistance of said biasing means to a second position when the fluid pressure in the tubular member exceeds a predetermined value controlled by said charge of gaseous fluid; said valve closure means being held out of flow preventing engagement with the valve seat at the lower end of said valve element when said valve element is in said second position, whereby flow of fluids may take place through the outer tubular member.

4. A well flow control device including: .an outer tubular member; an elongate tubular valve element longitudinally movably mounted in said outer tubular member and having a valve seat at its lower end; means in said outer tubular member biasing said valve element longitudinally therein to a first position in said tubular member and comprising a fined predetermined charge of gaseous fluid confined Within said tubular member and acting on said valve element; a valve closure clement connected to said outer tubular member swingably mounted in said outer tubular member and positioned to engage the valve seat at the lower end of said valve element when said valve element is in said first position to close the tubular bore of said valve element; and means on said valve element responsive to fluid pressure of the fluids flowing through said tubular outer member and within the tubular member downstream of the valve element for moving the valve element against the resistance of said biasing means when the fluid pressure of the fluids flowing through the valve and in the tubular member downstream of the valve closure element exceeds a predetermined value controlled by said charge of gaseous fluid to a second position in said tubular member; said valve element when so moved swingably moving said valve closure member to a position out of bore closing engagement with the end thereof to open the tubular bore of the valve element to flow therethrough.

5. A well tool for a well flow conductor including: an elongate outer member having a longitudinal bore therein; hanger and sealing means on said outer member for holding the outer member in a selected desired position in a well flow conductor and for sealing between the outer member and the Well flow conductor whereby flow of fluids in the Well conductor may occur only through such bore of the outer member; a valve element having a longitudinal flow passage mounted in said bore of the outer member for limited longitudinal movement between an upper closed position and a lower open position, said valve element and said outer member having engageable means, for closing said flow passage of said valve element when said valve element is in its upper closed position to prevent flow of fluids through the well tool, said engageable means comprising a valve seat provided on the lower .end of said valve element and a valve pivotally mounted on said outer member and movable pivotally and longitudinally into bore closing engagement with said valve seat to close said flow passage upon upward movement of said valve element to its upper position; and means on said valve element providing opposed surfaces exposed to the pressure of fluids flowing through said valve element and wherein the area exposed to such pressure downstream of the valve element is larger than the area exposed to pressure upstream thereof, so that the pressure of the fluids acting on said areas of said valve element provides means responsive to such fluid pressure for moving the valve element longitudinally in the tubular outer member to the lower position in said tubular outer member.

6. A well tool for a well flow conductor including: an elongate outer member having a longitudinal bore therein; hanger and sealing means on said outer member for holding the outer member in a selected desired position in a well flow conductor and for sealing between the outer member and the well flow conductor whereby flow of fluids in the well conductor may occur only through such bore of the outer member; a valve element having a longitudinal flow passage mounted in said bore of the outer member for limited longitudinal movement between an upper closed position and a lower open position; means in said outer member biasing said valve element toward the upper closed position in said outer member; said valve element and said outer member having engageable means for closing said flow passage of said valve element when said valve element is in its upper closed position to prevent flow of fluids through the well tool, said engageable means comprising a valve seat provided on the lower end of said valve element and a valve pivotally mounted on said outer member and movable into engagement with said valve seat to close said flow passage upon upward movement of said valve element to its upper position said outer member having a protective surface for engaging said valve seat when the valve element is in its lower open position to protect said valve seat against wear by the flow of well fluids therepast; and means on said valve element providing opposed surfaces exposed to the pressure of fluids flowing through said valve element and wherein the area exposed to such pressure downstream of the valve element is larger than the area exposed to pressure upstream thereof, so that the pressure of the fluids acting on said areas of said valve element provides means responsive to such fluid pressures for moving the valve element longitudinally in the tubular outer member to the lower position in said tubular outer member.

7. A well tool for a Well flow conductor including: an elongate outer member having a longitudinal bore therein; hanger and sealing means on said outer member for holding the outer member in a selected desired position in a Well flow conductor and for sealing between the outer member and the well flow conductor whereby flow of fluids in the well conductor may occur only through such bore of the outer member; a valve element having a longitudinal flow passage mounted in said bore of the outer member for limited longitudinal movement between an upper closed position and a lower open position; means in said outer member biasing said valve element toward the upper closed position in said outer member; said valve element and said outer member having engageable means for closing said flow passage of said valve element when said valve element is in its upper closed position to prevent flow of fluids through the well tool, said engageable means comprising a valve seat provided on the lower end of said valve element and a valve pivotally and longitudinally movably mounted on said outer member and movable into bore closing engagement with said valve seat to close said flow passage upon upward movement of said valve element to its upper position, said valve member being disposed outwardly of said valve member out of the stream of flow of well fluids through the flow conductor when the valve element is in its lower open position whereby said valve member is kept out of the stream of flow of well fluids when the valve element is in its lower open position; and means on said valve element providing opposed surfaces exposed to the pressure of fluids flowing through said valve element and wherein the area exposed to such pressure downstream of the valve element is larger than the area exposed to pressure upstream thereof, so that the pressure of the fluids acting on said areas of said valve element provides means responsive to such fluid pressures for moving the valve element longitudinally in the tubular outer member to the lower position in said tubular outer member.

8. A well tool for a Well flow conductor including: an elongate outer member having a longitudinal bore therein; hanger and sealing means on said outer member for holding the outer member in a selected desired position in a well flow conductor and for sealing between the outer member and the well flow conductor whereby flow of fluids in the well conductor may occur only through such bore of the outer member; a valve element having a longitudinal flow passage mounted in said bore of the outer member for limited longitudinal movement between an upper closed position and a lower open position; means in said outer member biasing said valve element toward the upper closed position in said outer member; said valve element and said outer member having engageable means for closing said flow passage of said valve element when said valve element is in its upper closed position to prevent flow of fluids through the Well tool, said engageable means comprising a valve seat provided on the lower end of said valve element and a valve pivotally mounted on said outer member and movable into engagement with said valve seat to close said flow passage upon upward movement of said valve element to its upper position; and means on said valve element providing opposed surfaces exposed to the pressure of fluids flowing through said valve element and wherein the area exposed to such pressure downstream of the valve element is larger than the area exposed to pressure upstream thereof, so that the pressure of the fluids acting on said areas of said valve element provides means responsive to such fluid pressures for moving the valve element longitudinally in the tubular outer member to the lower position in said tubular outer member; said outer member having a protective surface for engaging said valve seat when the valve element is in its lower open position to protect said valve seat against wear by the flow of well fluids therepast, said valve member being disposed outwardly of said valve member out of the stream of flow of well fluids through the flow conductor when the valve element is in its lower open position whereby said valve member is kept out of the stream of flow of well fluids when the valve element is in its lower open position.

9. A well tool for a well flow conductor including: an elongate outer member having a longitudinal bore therein; hanger and sealing means on said outer member for holding the outer member in a desired selected position in a well flow conductor and for sealing between the outer member and the well flow conductor whereby flow of fluids in the Well conductor may occur only through such bore of the outer member; a valve element having a longitudinal flow passage mounted in said bore of the outer member for limited longitudinal movement between an upper closed position and a lower open position; means in said outer member biasing said valve element toward the upper closed position in said outer member; said valve element and said outer member having engageable means for closing said flow passage of said valve element when said valve element is in its upper closed position to prevent flcw of fluids through the well tool, said engageable means comprising a valve seat provided on the lower end of said valve element and a valve pivotally mounted on said outer member and movable into engagement with said valve seat to close said flow passage upon upward movement of said valve element to its upper position, said valve member being pivotally mounted on said outer member and having an inwardly projecting arm when it is in an open position, said valve element having a trip means engageable with said arm upon upward movement of said valve element through a predetermined distance from its open position to its closed position to pivot said valve member inwardly and upwardly toward said valve seat to close said valve passage upon upward movement of said valve element in said outer member; and means on said valve element providing opposed surfaces exposed to the pressure of fluids flowing through said valve element and wherein the area exposed to such pressure downstream of the valve element is larger than the area exposed to pressure upstream thereof, so that the pressure of the fluids acting on said areas of said valve element provides means responsive to such fluid pressures for moving the valve element longitudinally in the tubular outer member to the lower position in said tubular outer member.

10. A well tool for a well flow conductor including: an elongate outer member having a longitudinal bore therein; means on said outer member for securing said outer member in a selected position in a well flow conductor and for directing flow of fluids in the well flow conductor through the bore of said outer member; a tubular valve element having a longitudinal flow passage therethrough and a valve seat at its lower end, said valve element being mounted in the bore of said outer member for limited longitudinal movement therein between an upper position and a lower position; a valve closure member swingably and longitudinally movably mounted on said outer member and movable into bore closing engagement with the seat at the lower end of said valve element for closing said flow passage of said valve element when said valve element is in its upper position to prevent flow of fluids through the well tool; means on said valve element providing an area exposed to the pressure of fluids flowing through the valve element and present within the outer member whereby such fluids move said valve element downwardly within the bore of the outer member to the lower position therein; said valve element when moved downwardly to its lower position engaging said closure member to swingably move the same out of bore closing engagement with the lower end of said valve element; said valve element and said outer member having means thereon defining a fluid tight chamber therebetween for receiving a fixed predetermined charge of compressible gas for biasing said valve element upwardly toward its closed position, whereby a predetermined fluid pressure must be present in the outer member and acting on the valve element to move the valve element downwardly in said outer member against the biasing force of the compressible gas in said chamber.

11. A well tool for a well flow conductor including: an elongate outer member having a longitudinal bore therein; means on said outer member for securing said outer member in a desired selected position in a well flow conductor and for directing flow of fluids in the well flow conductor through the bore of said outer member; a tubular valve element having a longitudinal flow passage therethrough and a valve seat at its lower end, said valve element being slidably mounted in the bore of said outer member for limited longitudinal movement therein between an upper position and a lower position; a valve closure member swingably and longitudinally movably mounted on said outer member and swingable into bore closing engagement with the seat at the lower end of said valve element for closing said flow passage of said valve element when said valve element is in its upper position to prevent flow of fluids through the well tool; said valve element when moved downwardly to its lower position engaging said closure member to swingably move the same out of bore closing engagement with the lower end of said valve element; said valve element and said outer member having means thereon defining a fluid tight chamber therebetween for receiving a fixed predetermined charge of compressible gas for biasing said valve element upwardly toward its closed position; and means on said valve element responsive to fluid pressure of the fluids flowing through said tubular outer member and within the outer member above said valve element for moving said valve element downwardly to said lower position against the resistance of said biasing charge in said chamber, when the fluid pressure within the outer member above the valve member exceeds a predetermined value controlled by said predetermined fixed charge of compressible gas, said charge of gas also determining the pressure conditions within the bore of the outer member above the valve element under which the valve element will be moved upwardly toward closed position.

12. A well tool for a well flow conductor including: an elongate outer member having a longitudinal bore therein; means on said outer member for securing said outer member in a desired selected position in a well flow conductor and for directing flow of fluids in the well flow conductor through the bore of said outer member; a tubular valve element having a longitudinal flow passage therethrough mounted in the bore of said outer member for limited longitudinal movement therein between an upper position and a lower position; said valve element having a seat at the lower end of its bore; a valve closure member swingably mounted on said outer member and swingable into engagement with the seat at the lower end of said valve element for closing said flow passage of said valve element when said valve element is in its upper position to prevent flow of fluids through the well tool; said valve element when moved downwardly to its lower position engaging said closure member to swingably move the same out of engagement with the lower end of said valve element; said valve element and said outer member having means thereon defining a fluid tight chamber therebetween for receiving a charge of compressible gas for biasing said valve element upwardly toward its closed position; means on said valve element exposed ill to the pressure of fluids flowing through said valve element and in the outer member to move said valve element downwardly toward its open position in said outer element when the pressure of the fluids present in said outer member and acting on said valve element exceeds a predetermined value; and means on said outer member engageable with the lower end of said movable valve element when said valve element is in its lower position to protect the seat at the lower end of said valve element against the cutting action of the fluids flowing through said valve element.

13. A well tool for a well flow conductor including: an elongate outer member having a longitudinal bore therein; means on said outer member for securing said outer member in a selected position in a well flow conductor and for directing flow of fluids in the well flow conductor through the bore of said outer member; a tubular valve element having a longitudinal flow passage therethrough mounted in the bore of said outer member for limited longitudinal movement therein between an upper position and a lower position; said valve element having a valve seat at the lower end of the flow passage therethrough; a valve closure member swingably mounted on said outer member and swingable into engagement with the seat at the lower end of said valve element for closing said flow passage of said valve element when said valve element is in its upper position to prevent flow of fluids through the well tool; said valve element when moved downwardly to its lower position engaging said closure member to swingably move the same out of engagement with the lower end of said valve element; said valve element and said outer member having means thereon defining a fluid tight chamber therebetween for receiving a charge of compressible gas for biasing said valve element upwardly toward its closed position; means on said valve element responsive to fluid pressure of the fluids flowing through said tubular outer member and within the outer member above said valve element for moving said valve element downwardly to said lower position against the resistance of said biasing charge in said chamber, when the fluid pressure within the outer member above the valve member exceeds a predetermined 12 value; and means on said outer member engageable with the lower end of said movable valve element when said valve element is in its lower position to protect the seat at the lower end of said valve element against the cutting action of the fluids flowing through said valve element.

14. A well flow control device including: an outer tubular member; an elongate tubular valve element longitudinally movably mounted in said outer tubular memher; said valve element having a seat formed at one end thereof; means in said tubular member biasing said valve element longitudinally therein to a first position in said tubular member; a valve closure element swingably mounted in said outer tubular member and positioned to engage said seat at said one end of said valve element when said valve element is in said first position to close the tubular bore of said valve element; and means on said valve element responsive to fluid pressure of the fluids flowing through said tubular outer member and within the tubular member downstream of the valve element for moving the valve element against the resistance of said biasing means when the fluid pressure exceeds a predetermined value to a second position in said tubular member; said valve element when so moved swingably moving said valve closure member to a position out of engagement with the end thereof to open the tubular bore of the valve element to flow therethrough; and means on said outer member engageable with said one end of said movable valve element when said valve element is in its second position to protect the seat at said one end of said valve element against the cutting action of the fluids flowing through said valve element.

References Qited in the file of this patent UNITED STATES PATENTS Conrad et al Sept. 13, 1960

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Referenced by
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Classifications
U.S. Classification137/496, 251/339, 166/324
International ClassificationE21B34/00, E21B34/08
Cooperative ClassificationE21B34/08, E21B2034/005
European ClassificationE21B34/08