US3164210A

US3164210A - Retrievable bridge plug

Info

Publication number: US3164210A
Application number: US116874A
Authority: US
Inventors: Lewis Francis Clifford
Original assignee: Individual
Current assignee: Individual
Priority date: 1961-06-13
Filing date: 1961-06-13
Publication date: 1965-01-05
Anticipated expiration: 1982-01-05

Description

Jan. 5, 1965 F. c. L Ewls RETRIEVABLE BRIDGE PLUG 2 Sheets-Sheet 1 Filed June 13, 1961 INVENT OR FRANC/S C EW/S ATTORNEY Jan. 5, 1965 F. c. I Ewls 3,164,210

RETRIEVABLE BRIDGE PLUG Filed June 13, 1961 2 Sheets-Sheet 2 W lf/ l INVENTOR FRANC/S C. LEWIS ATTORNEY 3,164,216 RETR'VAISLE ERDGE PLUG Francis Ciiiord iewis, B0. Box 4161, Wichita Falls, Tex. nasa rime 1s, 1951, ser. Ne. trarre Claims. (Cl. 16d-4t2@ This invention relates to a well tool or apparatus and more particularly relates to an improved well packer adapted to be retrievably introduced into and set in a well so as to plug the interior of any passage, conduit or pipe at any selected point.

Bridging, or other similar plugs are used in wells for various purposes. Under some circumstances, such as where wells are being cemented, acid treated, sandefraced, or dually completed, it is often necessary to plug the well at a point above the bottom so that pressure may be applied or testing may be conducted in the well bore above the plug. Under some circumstances, it may be necessary or desirable to place a plug or packer in the well either above or below the level at which cement or acid pressure or sand-tracing is to be applied to the well bore; or it is desirable to confine pressure applied to the well bore from above or below; or in some circumstances it is desirable or necessary to segregate a section or elevation of the well between two bridge plugs in order to apply cement or acid under pressure to the section so segregated. In some instances, it is desirable to leave this plug in position, while in other situations it is desirable to remove the plug by retrieving or by drilling out.

The present apparatus contemplates a device or assembly of devices by which the foregoing operations may be performed.

It is, therefore, an object of this invention to provide an improved retrievable type wire line bridge plug capable of being introduced into the well conduit and of being anchored therein against movement in either or both longitudinal directions and of being released and retrieved or moved to another location.

Another object of this invention is to provide an improved retrievable type bridge plug capable of allowing fluid by-pass through the plug while it is being moved longitudinally through the well conduit, and said tluid by-passes being capable or" being closed when the plug is set in the conduit.

Another object of the invention is to provide a retrievable bridge plug wherein the parts of the anchoring mechanism are held apart during running-in and retrieval to prevent premature anchoring.

Still another object of the invention is to provide a retrievable type bridge plug which can be set and released by hydraulic pressure and which may be removed or left in the hole as circumstances require.

Other and further objects of the invention will become readily apparent when the following description is considered in connection with the accompanying drawings wherein an example of the preferred embodiment of the invention is shown. This preferred form will now be described in detail to illustrate the general principles of the invention but it is understood that such detailed description is not to be construed as limiting the true scope of the invention as deined by the claims.

In the drawings, FIGURE 1 is a longitudinal view in sectional elevation illustrating the tool after it has been lowered into the well bore but before actuation thereof.

FIGURE 2 is a longitudinal view in sectional elevation showing the -tool in the well bore with both swab cups and both sets of slips expanded and set by means of hydraulic pressure.

FIGURE 3 is a longitudinal view in sectional elevation showing the spring loaded sleeve valve.

FIGURE 4 is a longitudinal view in sectional eleva- United States Patent O M 3,lb4,2l0 Patented Jan. 5, 1965 tion of the central portion of the tool showing an alternate structure of said central portion.

In its general aspects, the invention contemplates a bridge plug particularly designed to function in an oil well casing or similar conduit. By reason of its novel construction and parts, this bridge plug is greatly simplied in design and operation while, at the same time, providing to the art a more versatile tool. It is provided with anchoring means at its upper portion for anchoring the plug against downward movement and anchoring means at its lower portion for preventing upward movement of the plug in the conduit. In this improved device, the slips and cone at each end of the tool operate separately, each on a separate mandrel, and either the upper or lower slips may be set alone, or both upper and lower sets of slips may be set as required by conditions. While being pushed into the well conduit, however, the slips and the cones are forced apart, thereby obviating the possibilities of premature contact of the slips with the walls of the conduit and premature setting or jamming of the plug in the conduit. A valve arrangement is provided at the lower end of the tool which is eld open during running-in to permit the upward passing of well uid which may be encountered. This valve device is permitted to close when the plug is positioned thus preventing upward passage of uid during the setting of the anchoring means. Another valve device is provided on the upper end of the tool which is held open during retrieval to permit lluid from above to flow downward through the plug. The valve device is permitted to close when the plug is positioned thus preventing downward passage of Huid during the setting of the anchoring means.

The tool, as shown in FIGURES 1 and 2 comprises a control rod lil provided with a lug 11 at its upper end for iishing and retrieval of the plug. Control rod 10 extends the length of the plug to contact check valve ball 38, and at this lower end, control rod 10 contains attached wings 35 which provide centering over the check valve ball 38.

The upper section of the plug comprises a spring loaded sleeve valve 12 provided with a passage in the upper extremity of sleeve valve housing 13 through which passes control rod 10 sealed with O ring seals 1.4. Along the lower portion of sleeve valve body 45, openings 16 are provided through which fluid may pass from outside and above the plug through the inside thereof upon operation of the sleeve valve housing against the spring l5. Spring 15 is provided for returning the valve to closed position.

The lower end of sleeve valve body 45 is attached to the upper end of upper cone 21 having a central bore therethrough and containing the upper cone drag springs 19. At the juncture of upper cone 21 and sleeve Valve body 45 is fastened upper swab cup 18. Attached to the lower end of upper cone 21 is upper tubular mandrel 2S, flared at its lower end to form upper mandrel stop 26. Upper sleeve 24 encloses the lower portion of upper mandrel 25 and is prevented from downward motion by mandrel stop 26. Upper slips 22 are connected to upper sleeve 24 by upper slip reins 23 which are laterally exible flat resilient springs.

The lower section of the plug comprises a tubular mandrel 29 with a tubular mandrel stop 28 at the upper end thereof. The lower end of mandrel 29 is threaded securely into the inside of the small end of the lower expander cone 33 which has a central bore therethrough. A tubular latching thimble 34 is threaded in to the inside of the lower expanded portion of expander cone 33. Check valve housing 39 is threaded into the inside of the lower portion of latching thimble 34. The combination of lower mandrel 29 with stop 2S', lower expander cone 33, latching thimble 34 and check valve housing 39 constitute the body of the lower portion of the bridging plug and form a smooth, continuous central channel for passage of the control rod lll from mandrel stop 28 until it contacts check valve ball 3S. Check valve ball 38 rests on spring loaded plate 42 contained within check valve housing 39. Check valve housing 39 contains a multiplicity of holes 43 to permit the passage of lluid through the valve upon actuation. Sleeve 30 is located around mandrel 29 below mandrel stop 28. Main drag springs 27 are attached at one end to sleeve 30 and at the other end to sleeve 24. This provides the only fixed connection between the upper and lower portions of the plug. Main drag springs 27 are fiat resilient springs which expand and compress laterally. Lower slips 32 are provided between lower expander cone 33 and lower sleeve 30. Said lower slips 32 are provided with attachment to lower sleeve 30 by means of slip reins 3l which are laterally ilexible permitting the slips to move outwardly to engage the conduit walls upon upward movement of expander cone 33. Lower swab cup 37 is attached to the latching thimble 34 just below the lower end of expander cone 33 and is held in place by locking ring 36.

FIGURE 3 shows the details and operation of the spring loaded sleeve valve l2 which forms the upper end of the bridging plug shown in FIGURES l and 2. Valve body 45 is provided with external threads on the lower end thereof for secure attachment to the upper end of upper expander cone 2l. Above the threaded lower end, valve body 45 is expanded to form shoulder 47 and at its upper end is provided with retainer flange 46 threadably attached thereto and which forms the upper end of valve body 5. Between shoulder 47 and retainer flange 46, valve body 4S is provided with openings 16 for the passage of fluid from outside to inside the valve body. The slidable housing portion of spring loaded sleeve valve l2 is composed of upper portion l3nt and lower portion 13b which connect to form a unitary sleeve 13. Control rod It) passes through the upper end of sleeve Ha, is sealed by O rings 14 and extends the length of the valve. Control rod stop 2i) in its normal position is located in upper portion 13a of the sleeve valve. In a closed position as shown, therefore, slidable sleeve 13 slides over the upper part of valve body 45, a water-tight seal being formed by O rings 17, in the lower portion 13b of the sleeve, seating against shoulder 47. Spring l5 is located between sleeve portion 13b and the retainer flange 46 and is shown in its expanded state maintaining the valve closed.

FIGURE 4 shows an alternate sleeve and mandrel assembly. In this alternate structure,

sleeves

24 and 39 extend beyond mandrel stops 26 and 23 and are releasably joined in the space between the mandrel stops. Mandrel stop 26 seats on shoulder 43 and mandrel stop 23 seats on shoulder 49. Drain holes 44 are provided in those portions of

sleeves

24 and 39 between the mandrel stops and the point of joining of the two sleeves. Main drag springs 27 `are attached at their lower ends to lower sleeve 30 and are unattached at their upper ends where they contact upper sleeve 24 in order to allow for longitudinal expansion of the springs during running in. Mandrels and 29 are attached to expander cones 21 and 33 (not shown in this figure) in the same manner as in FIG- URE l.

In the operation and use of the bridge plug of this invention in a conduit string such as a well casing, the tool is inserted into the well casing and force is exerted on control rod l0 to push the tool down the casing. Such downward force causes check valve ball 38 and plate 42 to compress spring 41 thereby opening the lower valve to fluid flow and permitting the tool to be lowered into a lluid lled section of conduit if necessary. As check valve 4t), latching thimble 34 and expander cone 33 are all connected and move as a unit, the downward force exerted on controlV rodV lt) during the lowering operation exerts a constant force on expander cone 33 preventing Ila() contact with, actuation, or premature setting of slips 32.

As the lowering operation begins, main drag springs 27 are compressed laterally by conduit walls A thereby resisting downward movement of the tool and exerting a constant force on sleeve 3i) holding it l'lrmly against mandrel stop 23 and at the same time preventing any possible contact or engagement between the lower slips 32 and the lower expander cone 33. The upper sleeve 24 is attached to the upper end of main drag springs 27' which initially causes a small upward longitudinal movement of the sleeve 24 due to lateral compression of drag springs 27. After this initial upward movement, however, drag springs 27 prevent any further upward longitudinal motion of the upper sleeve 24. The upper slips 22, connected to the upper sleeve 24 by upper slip reins 23 are likewise prevented from any upward longitudinal motion during the lowering operation. The upper cone, however, is forced upward longitudinally during the lowering operation by upper cone drag springs 19, thereby forcing the upper slips and upper cone apart and preventing any premature contact of the slips with the conduit walls, Under some circumstances, upper cone drag springs I9 may be eliminated if desired. For example, when the

sleeves

24 and 30 are connected as shown in FIGURE 4 and are, therefore, not subject to any substantial longitudinal movement, the drag of swab cup 1S is suflicient to prevent premature expansion or setting of the upper slips 22.

Upon reaching the desired location in the conduit, the downward force on control rod 10 is released thereby allowing check valve spring 41 to return plate 42 and check valve ball 3S to their original position wherein check valve ball 38 is seated against the lower end of mandrel 29 and held in position by plate 42 and check valve spring 41 preventing any upward ow of iluid through the plug. Upon the application of pressure from below to the lower end of the plug, swab cup 37 is expanded and seals against the conduit walls A preventing the passage of any iluid past the plug except any flow which might be permitted to enter through check valve 4t? by actuation with control rod 1t). The pressure exerted on lower swab cup 37 forces lower expander cone 33 and lower mandrel 29 to move longitudinally upward until lower cone 33 contacts lower slips 32 and forces them to expand laterally into anchoring engagement with conduit walls A. As lower cone 33 and lower mandrel 23 move longitudinally upward, lower slips 32 and lower sleeve 30 are prevented from any substantial longitudinal motion by slip reins 31 and main drag springs 27. The plug is thus anchored in the conduit against any upward longitudinal motion.

If a pressure diiferential is applied above the bridge plug, the pressure will exert force in a downwardly direction on valve 12 and on upper swab cup 18. The pressure will expand upper swab cup 18 against the conduit walls A thereby preventing the passage of any iluid past the plug except any flow which might be permitted to enter through sleeve valve l2 upon actuation of control rod 10. The pressure exerted on upper swab cup 18 forces upper expander cone 2l and upper mandrel 25 to move longitudinally downward until upper cone 21 contacts upper slips 22 and forces them to expand laterally into anchoring engagement with conduit walls A. As upper cone 2l and upper mandrel 25 move longitudinally downward, upper slips 22 and sleeve 24 are prevented from any substantial longitudinal motion by slip reins 23 and main drag springs 27. The plug is thus anchored in the conduit against any downward longitudinal motion.

The plug may thus be anchored against upward movement by the application of pressure from below the plug, against downward motion by application of pressure from above the plug 'or against both upward and downward movement by application of pressure from both above and below. Great flexibility of operation is achieved by the ability to anchor the plug against upward motion, downward motion or both according to circumstances.

In the event it is desired to release the bridge plug and remove it from the well casing, or move it to a diiferent location in the well casing, a suitable mechanisnnsuch as a rishing tool, is provided which becomes coupled with the lug l1 on control rod lil. After coupling, to release the lower slips 32, push rod 1% is moved sharply downward into contact with check valve ball 33 forcing plate 42 into contact with check valve housing 39, preferably providing at least one sharp blow thereto. Check valve housing 39, latching thimble 34, swab cup 37, lower expander cone 33 and lower mandrel 29 are thereby moved longitudinally downward out of engagement with lower slips 32, allowing lower slip reins 3l to move the said slips laterally inward out of anchoring engagement with the conduit walls. Lower slips 32 are retained against longitudinally downward movement by slip reins 31 and sleeve 3G is retained by main drag springs 27.

To release the upper slips from anchoring engagement with the conduit walls, control rod l@ is moved sharply upward until control rod stop Ztl contacts the upper end of spring loaded sleeve valve housing 13a forcing spring loaded sleeve valve l2, the upper swab cup lil, upper expander cone 21, and upper mandrel upward thereby releasing the lateral force on upper slips 22. Upon release of the force exerted by upper cone 2l, upper slip reins 23 cause upper slips 22 to move laterally inward and out of anchoring engagement with the conduit. As control rod stop 2li is moved sharply upward into contact with the upper end of sleeve valve housing 13a to release slips 22, spring l5 is compressed and sleeve valve housing i3 is simultaneously moved longitudinally upward in relation to valve body 45 to the point that O-rings 17 are above the openings 16. Any fluid head above the bridge plug may then drain through openings lr6 into the central channel of the tool during the retrieving operation. Upon release of the force exerted by control rod stop 20 upon sleeve valve housing 23a, spring l5 returns sleeve valve housing 13 downward to its normal closed position.

After releasing the engaged slips and opening the sleeve valve to fluid passage, the bridge plug may be easily moved to another location in the casing or removed therefrom.

I claim:

l. An improved well plugging device comprising an upper and a lower tubular mandrel, said upper tubular mandrel having a stop on the lower end thereof and said lower tubular mandrel having a` stop on the upper end thereof, an upper cone having a, central bore therethrough attached to said upper mandrel, upper drag springs attached to said upper cone, upwardly facing cupshape packing lixed to said upper cone and coacting therewith, an upper spring loaded sleeve valve attached to said upper cone, an upper sleeve around said upper mandrel and above said upper mandrel stop, upper conduit engageable slip means, upper slip reins connecting said upper sleeve and upper conduit engageable slip means, said upper cone and upper conduit engageable slip means coacting to anchor the said well plugging device against downward movement; a lower cone having a central bore therethrough attached to said lower tubular mandrel, a tubular latching thimble attached to the lower end of said lower cone, a lower spring loaded check valve attached to said tubular latching thimble, a downwardly facing cup-shaped packing fixed to the lower end of said lower cone and coacting therewith, a lower sleeve around the said lower tubular mandrel above the said lower cone and below the said lower mandrel stop, lower conduit engageable slip means, lower slip reins connecting said lower sleeve and lower conduit engageable slip means, said lower cone and lower conduit engageable slip means coacting to anchor the said well plugging device against upward movement; main drag springs expandable and compressible laterally and attached at their lower ends to the lower sleeve and at their upper ends to the upper sleeve; a control rod passing through theI well plugging device, and actuating the lower valve with downward motion and actuating the upper valve with upward motion.

2. An improved well plugging device comprising an upper and a lower tubular mandrel, said upper tubular mandrel having a stop on the lower end thereof and said lower tubular mandrel having a stop on the upper end thereof, an upper cone having a central bore therethrough attached to said upper tubular mandrel, upper drag springs attached to said upper cone and coacting therewith, upwardly facing cup-shaped packing xed to said upper cone and coacting therewith, a self-closing valve means having a central passage therethrough, a perforated upper sleeve -around said upper tubular mandrel and extending below said upper mandrel stop andhaving an internal shoulder which engages the upper mandrel stop upon downward movement, upper conduit engageable slip means, upper slip reins connecting said upper sleeve and said upper conduit engageable slip means, said upper cone and upper conduit engageable slip means coacting to anchor the said well plugging device against downward movement; a lower cone having a central bore therethrough attached to said lower tubular mandrel, a

.tubular latching thimble attached to the lower end of said lower cone, a self-closing lower valve means attached to said latching thimble, a downwardly facing cup-shaped packing xed to the lower end of said lower cone and ccacting therewith, a perforated lower sleeve around the said lower mandrel and extending above the said lower mandrel stop and connected with the upper sleeve, said lower sleeve having an internal shoulder which engages the lower mandrel stop upon downward movement, lower conduit engageable slip means, lower slip reins connecting said lower sleeve and lower conduit engageaole slip means, saidflower cone and lower conduit engageable slip means coacting to anchor the said well plugging device against upward movement; main drag springs expandable and compressible laterally and attached at one end to one of said sleeves; a control rod passing through the well plugging device and actuating the lower valve with downward motion and actuating the upper valve with upward motion.v

l 3. .An improved well plugging device comprising an upper and a lower tubular mandrel, said upper tubular mandrel having =a stop on the lower end thereof and said lower tubular mandrel having a stop on the upper end thereof, an upper cone having a central bore therethrough attached to said upper tubular mandrel, lan upwardly facing cup-shaped packing fixed to said upper cone and coacting therewith, a self-closing upper valve means attached to said upper cone and having a central passage therethrough to form, in combination with the upper cone and upper mandrel, a central channel through the upper pontion of the well plugging device, an upper sleeve around the said upper mandrel and below the said upper cone and prevented from downward longitudinal motion by the said upper mandrel stop, upper conduit engageable slip means, upper slip reins connecting said upper sleeve and said upper conduit engageable slip means, said upper cone and upper conduit engageable slip means coacting to ichor the said well plugging device against downward movement; a lower cone having a central bore therethrough attached to said lower tubular mandrel and forming a central channel through the lower portion of said device said central channels forming the central channel of the device, a lower self-closing valve means attached to said lower cone, a downwardly facing cup-shaped packing fixed to the lower end of said lower cone, a lower sleeve around the said lower tubular mandrel and above the said lower cone and prevented from upward motion by said lower mandrel stop, lower conduit engageable slip means, lower slip reins connecting said ylower sleeve and lower conduit engageable slip means, said lower cone and lower conduit engageable slip means coacting to anchor the saidk well plugging device against upward Y movement; main drag springs expandable and compressble laterally and attached at Vtheir lower ends tothe lower sleeve and attached at their upper ends to the upper sleeve, a control rod passing through the central channel of said device engageahle upon upward movement with the upper valve to open said upper valve and permit Huid passage therethrough and engageable upon downward movement with the lower valve to open said lower valve to permit fluid passage therethrough.

4. An improved well plugging device comprising an upper and a lower tubular mandrel, said upper tubular mandrel having `a stop on the lower end thereof and said lowertubular mandrel having a stop on the upper end thereof, an upper cone having a central bore therethrough attached to said upper tubular mandrel, -an upwardly facing cup-shaped packing fixed to said upper cone and coacting therewith, a self-closing upper valve means attached to said upper cone and having a central passage therethrough to form, in combination with the upper cone and upper mandrel, a central channel through the upper portion of the well plugging device, an upper sleeve around said upper mandrel and above said upper mandrelstop, upper conduit engageable slip means, upper slip reins connecting said upper sleeve and said upper conduit engageable slip means, said upper cone and upper conduit engageable slip means coacting to anchor the said well plugging device against downward movement; a lower cone having a central bore therethrough attached to said lower tubular mandrel and forming a central channel through the lower portion of said well plugging device, said central channels forming the central channel of the device, a lower self-closing valve means attached to said lower cone, a downwardly facing cup-shaped packing fixed to the lower end of said lower cone, a lower sleeve around the said lower tubular mandrel and above the said lower cone and below the said lower mandrel stop, lower conduit engageable slip means, lower slip reins connecting said lower sleeve and lower conduit engageable slip means, said lower cone and lower conduit engageahle slip means coacting to anchor the said well plugging device against upward movement; main drag springs expandable and compressihle laterally and attached at their lower ends to the lower sleeve and attached at their upper ends to the upper sleeve; a control rod passing through the central channel of said device, engageable upon upward movement with the upper valve to open said upper valve and permit uid passage therethrough and engageable upon downward movement with the lower valve to open said lower valve to permit iiuid passage therethrough.

5. An improved well plugging device comprising an upper and a lower tubular mandrel, said upper .tubular mandrel having a stop on the lower end thereof and said lower tubular mandrel having a stop on the upper end thereof, an upper cone having a central bore therethrough attached to said upper tubular mandrel, an upwardly facing cup-shaped packing fixed to said upper cone, a self-closing upper valve means attached to said upper cone and having a central passage .therethrough to for-m, in combination with the upper cone and upper mandrel, a central channel through the upper portion of the well plugging device, a perforated upper sleeve around said upper tubular mandrel and extending below said upper mandrel stop, upper conduit engageable slip means, upper slip reins connecting said upper sleeve and said upper conduit engageahle slip means, said upper cone and upper conduit engageable slip means coacting to anchor the said well plugging device against downward movement; a lower cone having a central bore therethrough attached to said lower tubular mandrel, 'a self-closing lower valve means attached to said lower cone, a downwardly facing cup-shaped packing fixed to the lower end of said lower cone, a perforated lower sleeve around the said lower mandrel and extending above the said lower mandrel stop and connected with the upper sleeve, lower conduit engageable slip means, lower slip reins connecting said lower sleeve and lower conduit engageahle slip means, said lower cone and lower conduit engageable slip means coacting to anchor the said well plugging device against upward movement; main drag springs expandable and compressible laterally and attached at one end to one of said sleeves; a control means in said device engageable upon upward movement with the upper valve to open said upper valve and permit fluid flow therethrough and engageable upon downward movement with the lower valve to open said lower valve and permit i'luid flow therethrough.

References Cited in the tile of this patent UNTED STATES PATENTS 2,751,012 Baker et al. lune 19, 1956

Claims

1. AN IMPROVED WELL PLUGGING DEVICE COMPRISING AN UPPER AND A LOWER TUBULAR MANDREL, SAID UPPER TUBULAR MANDREL HAVING A STOP ON THE LOWER END THEREOF AND SAID LOWER TUBULAR MANDREL HAVING A STOP ON THE UPPER END THEREOF, AN UPPER CONE HAVING A CENTRAL BORE THERETHROUGH ATTACHED TO SAID UPPER MANDREL, UPPER DRAG SPRINGS ATTACHED TO SAID UPPER CONE, UPWARDLY FACING CUPSHAPE PACKING FIXED TO SAID UPPER CONE AND COACTING THEREWITH, AN UPPER SPRING LOADED SLEEVE VALVE ATTACHED TO SAID UPPER CONE, AN UPPER SLEEVE AROUND SAID UPPER MANDREL AND ABOVE SAID UPPER MANDREL STOP, UPPER CONDUIT ENGAGEABLE SLIP MEANS, UPPER SLIP REINS CONNECTING SAID UPPER SLEEVE AND UPPER CONDUIT ENGAGEABLE SLIP MEANS, SAID UPPER CONE AND UPPER CONDUIT ENGAGEABLE SLIP MEANS COACTING TO ANCHOR THE SAID WELL PLUGGING DEVICE AGAINST DOWNWARD MOVEMENT; A LOWER CONE HAVING A CENTRAL BORE THERETHROUGH ATTACHED TO SAID LOWER TUBULAR MANDREL, A TUBULAR RATCHING THIMBLE ATTACHED TO THE LOWER END OF SAID LOWER CONE, A LOWER SPRING LOADED CHECK VALVE ATTACHED TO SAID TUBULAR LATCHING THIMBLE, A DOWNWARDLY FACING CUP-SHAPED PACKING FIXED TO THE LOWER END OF SAID LOWER CONE AND COACTING THEREWITH, A LOWER SLEEVE AROUND THE SAID LOWER TUBULAR MANDREL ABOVE THE SAID LOWER CONE AND BELOW THE SAID LOWER MANDREL STOP, LOWER CONDUIT ENGAGEABLE SLIP MEANS, LOWER SLIP REINS CONNECTING SAID LOWER SLEEVE AND LOWER CONDUIT ENGAGEABLE SLIP MEANS, SAID LOWER CONE AND LOWER CONDUIT ENGAGEABLE SLIP MEANS, COACTING TO ANCOR THE SAID WELL PLUGGING DEVICE AGAINST UPWARD MOVEMENT; MAIN DRAG SPRINGS EXPANDABLE AND COMPRESSIBLE LATERALLY AND ATTACHED AT THEIR LOWER ENDS TO THE LOWER SLEEVE AND AT THEIR UPPER ENDS TO THE UPPER SLEEVE; A CONTROL ROD PASSING THROUGH THE WELL PLUGGING DEVICE AND ACTUATING THE LOWER VALVE WITH DOWNWARD MOTION AND ACTUATING THE UPPER VALVE WITH UPWARD MOTION.