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Publication numberUS3247905 A
Publication typeGrant
Publication dateApr 26, 1966
Filing dateNov 28, 1962
Priority dateNov 28, 1962
Publication numberUS 3247905 A, US 3247905A, US-A-3247905, US3247905 A, US3247905A
InventorsBaker Eugene E
Original AssigneeHalliburton Co
Export CitationBiBTeX, EndNote, RefMan
External Links: USPTO, USPTO Assignment, Espacenet
Cementing collar and knock-down actuating plugs
US 3247905 A
Abstract  available in
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Claims  available in
Description  (OCR text may contain errors)

Apm'ifl 26, R966 E. E. BAKER 3,24%W5 CEMENTING COLLAR AND KNOCK-DOWN ACTUATING PLUGS Filed Nov. 28, 1962 2 Sheets-Sheet 1 INVENTOR.

FUGE/VE E. EAEEE AWvEA/EM E. E. BAKER A miil 2, 1966 CEMENTING COLLAR AND KNOCK-DOWN ACTUATING PLUGS 2 Sheets-Sheet 2 Filed Nov. 28, 1962 INVENTOR. EUGENE 5 5,4658

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3,247,905 CEMENTING CQLLAR AND KNUCK-DQWN ACIUATING PLUGS Eugene E. Baker, Duncan, Okla, assignor to Hallihurton Company, Duncan, km, a corporation of Delaware Fitted Nov. 28, 1962, Ser. No. 240,486 14 Claims. (Cl. 166-494) This invention relates to a cementing collar for use in a string of well-casing and actuating plugs for opening and closing ports in the collar. In particular, this inven tion is directed to such a collar for use in multiple-stage cementing operations of oil wells with the actuating plugs being capable of being moved down the well casing after use, thereby eliminating the need for subsequently drillin g or milling through these plugs.

There are numerous situations in the drilling and completion of oil or gas wells wherein it is desirable to cement a well pipe or casing into the open-well bore. Conventionally, cement slurry is pumped downwardly through the well pipe or casing, out the bottom of the well pipe or casing, and upwardly in the annular space between the well bore and the Well pipe or casing. However, the well casing may be extremely long, and therefore the cement bond and fill in the upper or medium portions of the casing may not be entirely satisfactory. Moreover, occasionally it is highly desirable to obtain a particularly good cement fill and bond in an upper or medium portion of the casing, as well as near the bottom of the casing. Thus, it has become customary under these conditions and re quirements to perform multiple-stage cementing where cement slurry is introduced into the annulus between the casing and the well bore in successive stages at more than one location along the length of the casing.

There are several types of devices known as cementers or cementing collars which may be used for introducing cement slurry into the annulus from within the well casing at any desired location along the well casing. These cementing collars are interposed in the string of well casing and have closed ports which may be opened for discharging cement slurry into the annulus and subsequently may be closed.

These opening and closing steps are generally accomplished by dropping or pumping a pair of plugs, bombs, go-devils, or other type devices down the well casing, the first of which engages a portion of the cementing collar and opens the ports, and the second of which engages another portion of the cementing collar and closes the ports. These plugs or other devices are retained in the cementing collar, and if it is subsequently desired to gain access to the casing below the cementing collar with any type of piping, tubing, testing devices, or other apparatus, it is first necessary to drill through these retained plugs or other devices. Since the operation which is to be performed below .suchplugs does not always permit the provision of a drill on the end of the string of pipe being lowered to perform such operation, this drilling must be conducted as a separate, preceding operation requiring an expensive and time-consuming round trip with a drill and string of pipe.

Moreover, some cementing collars are provided with parts and elements which serve only to prevent rotation of the plugs, etc., that are to be drilled out and perform no other useful function in the operation of the cementing collar. Thus, the provision of these parts and elements increases the cost of the device, which would not be necessary if the plugs or other types of devices used in actuating the cementing collar could be disposed of by means other than drilling.

Accordingly, by this invention, there is provided a novel cementing collar and devices for actuating same in which the actuating devices can be knocked down the itcd tates Patent 0 3,247,905 Patented Apr. 26, 1966 well casing by any string of pipe or tubing which is lowered into the casing for performing additional useful functions, operations, or testing below the cementing collar.

It is therefore a principal object of this invention to provide a novel form of cementing collar having ports which may be opened and closed by novel actuating devices, and such devices may be mechanically released from the cementing collar and knocked through the cementing collar after completion of the cementing operation.

Another object of this invention is to provide a pair of novel actuating devices for use with a cementing collar, wherein the first-used device for opening the collar is released and knocked through the collar by the second-used device when such device reaches the cementing collar, to close the collar.

A still further object is to provide such a second-used actuating device that may be released from the cementing collar and knocked down the well casing by the mere imposition of weight on an upper portion of such device.

A further object of this invention is to provide a novel form of co-operating cementing collar and actuating devices wherein the actuating devices mechanically and affirmatively engage the cementing collar to open and close the collar, but may be disengaged from the collar and knocked down the well casing through the proper application of mechanical force.

A still further object is to provide such a collar and devices wherein the collar has a relatively large minimum internal diameter after the actuating devices have been knocked through a collar, thereby allowing conventionally used sizes of piping, tubing, or other devices to pass through the collar, and wherein a milling cutter may be used on the exterior of such piping, tubing, or other devices for readily enlarging such minimum diameter to any desired internal diameter.

Still a further object of this invention is to provide novel devices for actuating a-cementing collar wherein those devices appropriately engage the cementing collar and may be released therefrom by mere longitudinal downward movement of a portion of each device.

Other and more detailed objects and advantages of this invention will appear from the following description of the accompanying drawings.

In the drawings:

FIGURE 1 is a sectional elevation of the cementing collar of this invention connected in a string of casing and positioned in a well bore, with the ports of the cementing collar closed;

FIGURE 2 is a sectional elevation similar to FIGURE 1, with one of the actuating devices of this invention having served to open the ports of the cementing collar;

FIGURE 3 is a sectional elevation similar to FIGURE 2, with the other actuating device of this invention serving to release the first-used actuating device and prior to closing the ports in the cementing collar;

FIGURE 4 is a sectional elevation similar to FIGURE 3, showing the first-used actuating device of this invention released and dropping down the well casing and the second-used operating device of this invention having served to close the ports of the cementing collar;

FIGURE 5 is a sectional elevation similar to FIGURE 4, illustrating the second-used actuating device of this invention being released from the cementing collar by the application of force from above by the weight of a string of tubing; and

FIGURE 6 is a sectional elevation similar to FIGURE 5, illustrating a milling operation which may be performed, if desired, by the string of tubing after release of the actuating devices of this invention.

Referring now to the drawings, the cementing collar, generally designated 10, of this invention is threaded into a string of casing 11 in a conventional manner by upper and lower threads 12 and 13, respectively. The string of easing with the cementing collar is lowered into the well bore 14 and positioned at the desired location. A first stage of cementing may be conducted in a conventional manner, wherein the cement slurry is pumped down through the casing 11 and through cementing collar 10. Conventional top and bottom plugs may be used above and below this first stage of cement slurry, and such plugs are adapted to pass through cementing collar 10 without actuating any of the components thereof. Moreover, it will readily appear to those skilled in the art that a plurality of cementing stages may be carried on below cementing collar 10 by using cementing collars similar to collar 10 that have various components with smaller internal diameters than similar components in collar 10, so that actuating plugs and devices may pass through illustrated cementing collar 10 without effect and pass on to lower cementing collars for actuating same.

The cementing collar 10 is provided with a cylindrical housing 15 having a connecting sub 16 containing threads 12 connected to the upper end of housing 15 and a connecting sub 17 containing threads 13 connected to the lower end of housing 15. Housing 15 is provided with a plurality of ports 18, through which the cement slurry will be discharged into the annular space between the well casing 11 and well bore 14 to accomplish this stage of cementing. An opening sleeve 19 is positioned inisde and in the lower portion of housing 15 but spaced from connecting sub 17. Opening sleeve 19 is maintained in this position by threaded shear pins 20 connecting opening sleeve 19 to housing 15. Opening sleeve 19 is of sufficient length to cover ports 13 when appropriately positioned with shear pins 20 in place. Annular grooves and O-rings 21 are provided on the exterior of sleeve 19 on each side of ports 18 for completely sealing ports 18 against passage of fluid therethrough in either direction. Sleeve 19 has an internal bore 22 for a portion of its length terminating at an inwardly directed shoulder 23 near the lower end of the sleeve. An annular seat 24 fits within bore 22 and engages shoulder 23 to limit downward movement of the seat relative to the sleeve 19. Annular seat 24 is provided with a tapered shoulder 25 at the upper end.

A closing sleeve 26 is positioned in the upper portion and inside of housing 15. Closing sleeve 26 is maintained in the appropriate position by means of a plurality of threaded shear pins 27 connecting the sleeve to housing 15. Closing sleeve 26 has a major external cylindrical surface adapted to closely fit the internal cylindrical surface of housing 15 with O-ring grooves and seals 28 to accomplish the desired sealing. The lower portion of sleeve 26 is provided with reduced external cylindrical surface 29 adapted to closely fit inside of the upper internal cylindrical surface 30 of opening sleeve 19. O- ring grooves and seals 31 are provided in surface 29 for accomplishing sealing relationship with internal surface 30 for the purposes hereinafter described. The upper end of closing sleeve 26 is provided with an external groove 32 of substantial width, wherein there is positioned a pair of split rings 33 appropriately formed to tend to expand beyond the internal diameter of housing 15. These rings 33 are retained as shown within groove 32 and confined by the internal surface of housing 15. An annular seat 34 is threadedly mounted on the interior of closing sleeve 26 in the upper portion thereof. Annular seat 34 is provided with an internal upwardly facing tapered shoulder 35. It is to be noted that the minimum internal diameter of sleeve 26 and seat 35 is cylindrical surface 36, and such diameter is greater than the diameter of cylindrical surface 37, which similarly is the minimum internal diameter of sleeve 19 and seat 24. The diameters of cylindrical surfaces 36 and 37 are both smaller than the internal diameter of casing 11 or the internal diameters of any other portion of collar 10.

Moreover, it is noted that the diameters of cylindrical surfaces 36 and 37 are sufficiently large to permit the passage therethrough of plugs and other devices used in cementing stages below collar 10.

Referring now more particularly to FIGURE 2, when the previous stages of cementing have been completed and it is desired to discharge cement through ports 18, an opening plug or bomb, generally designated 40, is dropped into casing 11 and is either pumped or falls freely down to cementing collar 10'. Although a bomb 40 is shown and will be described, it is to be understood and will be readily apparent to those skilled in the art that if it is desirable to use a plug-type device wherein such device is pumped down the casing just below the cement slurry, then bomb 40 may be appropriately modified to include the necessary wiper members to function as a plug. However, bomb 40 shown is of the type that is dropped and falls by gravity through the fluid to a position within cementing collar 10. Opening bomb 4% has a body member 41 with an-internal passage 42 in the lower portion and an internal bore 43 in the upper portion. A stub mandrel 44 fits into bore 43 and is positioned and secured therein by threaded shear pin 45. Stub mandrel 44 has a reduced diameter portion 46 protruding upwardly beyond body 41. Mandrel 44 is also provided with an internal bore 47 and lateral passageways 48, communicating therewith. A check-valve assembly 49 is provided in body 41 for preventing fluid flow from bore 43 to passage 42, but permitting fluid flow in the reverse direction. Body 41 is provided with a plurality of radial slots or bores 50 adjacent mandrel 44 for accommodating a plurality of balls 51. A lock ring 52 fits in an annular groove in body 41 and surrounds the plurality of balls 51. Lock ring 52 is a split ring preformed to tend to collapse on balls 51. Balls 51 are radially supported by stub mandrel 44 and, in turn, support lock ring 52 such that the outside diameter of the lock ring is greater than the outside diameter of body 41. i

As bomb 40 reaches cementing collar 10, the various components of the collar are in the positions shown in FIGURE 1. The outside diameter of body 41 is slightly smaller-than cylindrical surface 37 of seat 24, and therefore the bomb 40 drops into seat 24 until lock ring 52 engages shoulder 25 of the seat. An annular seal 53 is provided in an annular groove in the external surface of body 41 and is adapted to fit and seal with cylindrical surface 37. With bomb 40 resting in seat 24 and opening sleeve 19 still in its original position, fluid pressure is applied in the casing 11 at ground level, thereby tending to force bomb 40, seat 24, and sleeve 19 downwardly with respect to housing 15. When a sufficient pressure is imposed, shear pin 20 will be sheared and sleeve 19, seat 24, and bomb 40 will move downwardly to the position shown in FIGURE 2, thereby opening ports 18. The check valve 49 prevents an excessive buildup of pressure below'bomb 40 that would tend to prevent this downward movement and resultant opening of ports 18. The cement slurry may then be pumped down through casing 11 and out through ports 18 into the annular space between well bore 14 and the casing.

When the desired amount of cement slurry has been introduced into the casing to accomplish the desired cement fill, the closing plug, generally designated 60, is inserted on top of the cement slurry and serves the same functionas a conventional top plug. Closing plug 60 is provided with resilient wiper means 61 for separating the cement slurry from the fluid introduced above the plug, as is conventional. Wiper means 61 is mouned on a body 62, which is in turn slidably mounted on a rod 63. Body 62 is threadedly connected to a cage member 64, which is also slidably mounted on rod 63. However, a threaded shear pin 65 connects cage member 64 to rod 63, and therefore cage 64 and body 62 are secured to rod 63. A stub mandrel 66 is threadedly mounted on the lower end of rod 63 and is provided with an enlarged portion 67, positioned within cage member 64. The external diameters of cage member 64, body 63, and stub mandrel 66 are all smaller than the diameter of internal cylindrical surface 36 and therefore may pass therethrough. Cage 64 is provided with a plurality of radial slots or holes 66 for accommodating a plurality of balls 69 to support a locking ring 76 in the same manner as the support of locking ring 52, heretofore described. Enlarged portion 67 of mandrel 66 senves to support the balls 69 against radial compression by ring 70. Ring 70 is split and preformed to tend to collapse inwardly but, as supported, has a larger external diameter than the internal diameter of cylindrical surface 36.

Thus, it may be seen that closing plugs 66 will enter collar and locking ring 70 will enter seat 34 and proceed downwardly until the locking ring engages upwardly, facing shoulder 35 of seat 34. However, prior to engagement of shoulder 35 by locking ring 70, the lower extremity of stub mandrel 66 will engage the upper end of stub mandrel 44 to resist further downward movement of the closing plug 66. Additional fluid pressure is then ap-. plied within casing 11 above plug 66, tending to force plug 66 downwardly, thereby urging stub mandrel 44 downwardly. On application of suflicient fluid pressure, shear pin 45 will be sheared and stub mandrel 44 will begin to move downwardly in bore 43. This intermediate position is shown in FIGURE 3. Slight additional movement will bring locking ring 70 into engagement with shoulder 35, and application of additional fluid pressure will urge seat 34 and closing sleeve 29 downwardly until suflicient pressure is applied to shear pins 27. Shearing of pins 27 permits the closing sleeve 26, seat 34, closing plug 60, and stub mandrel 44 all to move downwardly. When stub mandrel 44 has moved downwardly with respect to body 411. a sufficient distance to position the reduced portion 46 of the mandrel adjacent holes 56 and balls 51, the balls will be urged inwardly by locking ring 52, thereby collapsing the ring to the position shown in FIGURE 4 and permitting the bomb 46 to pass through seat 24 and drop down the casing 11. Stub mandrel 44 is provided with bore 47 and lateral passages 48 to permit any fluid passing through check valve 49 to pass through the stub mandrel 44, thereby not preventing the heretofore described downward motion. Continued application of fluid pressure in casing 11 above plug 60 causes the plug, seat 34, and sleeve 26 to move downwardly to the position shown in FIGURE 4. In this position the reduced portion 29 of sleeve 26 fits into the cylindrical surface of opening sleeve 18 and O-rings 26 fit the inner surface of housing 15 above ports 18, to thereby close ports 18 to the passage of fluid in either direction therethrough. Housing 15 is provided with an internal annular groove appropriately spaced above ports 18 such that rings 33 expand outwardly into groove 71 when sleeve 26 is in the closed position shown in FIG- URE 4. Groove 71 is provided with a downwardly facing shoulder at the upper extremity thereof, so that the uppermost ring 33 engages the shoulder to limit any upward movement of sleeve 26 with respect to housing 15. Thus it may be seen that ports 18 are closed and sleeve 26 is latched in the closed position and confined sufliciently to maintain this closed relationship.

When it is desired to perform some operation below cementing collar It or to merely run a string of tubing therethrough, the appropriate tubing or pipe with the desired apparatus is lowered into the casing 11 and engages a cap 72 threadedly mounted at the upper end of rod 63 of the closing plug 60, the tubing or pipe being generally designated 73. A certain amount of the weight of the tubing 73 will be supported by plug 60 through rod 63, shear pin 65, cage 64 and lock ring 70 engaging shoulder of the closing sleeve 26. -By setting down additional weight of the tubing 73 on the rod 63, the pin 65 will be sheared, thereby permitting the rod and stub mandrel 66 to move downwardly relative to the cage 64 and body 62. When the enlarged portion 67 of mandrel 66 has passed the holes 68 and balls 69 in cage 64, the balls will be permitted to move inwardly and the lock ring 76 will move inwardly to thereby become disengaged from shoulder 35, this condition being shown in FIGURE 5. Further downward movement of tubing 73 will urge the plug 66 on through cementing collar 16 and downwardly in casing 11. The ports 18 will remain closed, since closing sleeve 27 is latched in the closed position by rings 33.

By appropriately adjusting the sizes, materials, and number of each of the shear pins 20, 27, 45, and 65, various desirable relationships may be obtained to enhance and insure the over-all performance of the cementing collar 10, bomb 4t), and closing plug 69. For example, by providing shear pins 27 with-a much higher shear strength than shear pins 26, it will be possible by observing the fluid pressure applied in casing Ill after bomb 40 has been dropped, to determine whether or not bomb 40 is resting in seat 24 or has hung-up in seat 34. If the appropriate pressure for shearing pins 20 is exceeded without a rapid reduction in pressure by opening ports 18, then it may be concluded that there has been some malfunction. Likewise, the shear strength of each of the shear pins may be predetermined so that the appropriate pressures and weight loads which must be applied to cause shearing is known, and therefore the operation of the cementing collar lit and actuating devices can be virtually observed from ground level.

Referring to FIGURE 6, a billing cutter 74 may be provided on the tubing 73 that is being lowered into the well, and such cutter 74 may be positioned anywhere that is convenient along the length of the tubing 73. Milling cutter 74 is adapted to mill to a diameter slightly less than the internal diameter of the casing 11. The only components of cementing collar 16 that have a smaller internal diameter than casing llll are the seats 24 and 34. Thus it is preferred to construct seats 24 and 34 of a readily millable material, such as aluminum, so that milling cutters 74 may readily pass through cementing collar 10 and leave a full internal bore substantially the size of the casing 11.

Thus it may be seen that by this invention there is provided a cementing collar and actuating device for opening and closing that collar and that such devices are adapted to be knocked out of the cementing collar and urged down the casing, to thereby obviate the need for drilling out such devices to gain access to the casing below the cementing collar. Although a particular cementing collar is shown and described, it will be readily understood by those skilled in the art that various adaptations may be made on other types of conventional cementing collars to permit the use of and cooperation with the actuating devices, bomb 40, and plug 60, heretofore described. Moreover, it will readily appear to those skilled in the art that various modifications of the specific locking and unlocking structures described may be made without departing from this invention.

Having fully described my invention, it is to be understood that I do not wish to be limited to the details herein set forth or to the details illustrated in the drawings, but my invention is of the full scope of the appended claims.

I claim:

ll. In a device for actuating an opening or closing sleeve of a cementing collar to move such sleeve from a first position to a second position, the combination of: a body having an external groove and an internal bore with apertures between said groove and bore in communication with said groove and bore, a split lock ring positioned in said groove, a mandrel positioned in said internal bore, means positioned in said apertures and extending between said lock ring and said mandrel for preventing inward collapsing of said lock ring, said lock ring protrud- 1 ing outwardly from said body for engaging a sleeve of the cementing collar for moving that sleeve from the first to second positions upon longitudinal movement of said body, and said mandrel mounted in said body for longitudinal movement to a release position relative to said body upon application of force from above and having means for permitting both the said means positioned in said apertures and the said lock ring to collapse inwardly at the said release position of the mandrel to permit the entire device to pass through the cementing collar.

2. The combination of claim 1 wherein frangible means are provided and join said mandrel and said body to prevent said longitudinal relative movement until such moving force reaches a predetermined magnitude.

3. In a pair of devices for actuating the opening and closing sleeves of a cementing collar to move both of such sleeves from first positions to second positions, comprising: first and second actuating devices for passing through the well pipe to the cementing collar, said first actuating device having lock means for engaging the opening sleeve to move that sleeve to the second position upon downward movement of said actuating device, release means mounted in said first actuating device for movement from a position for retaining said lock means in engagement with the opening sleeve to a position for permitting said lock means to disengage from the opening sleeve for allowing said first actuating means to pass through the cementing collar, said second actuating device having lock means for engaging the closing sleeve to move that sleeve to the second position upon downward movement of said actuating device, and release means mounted in said second actuating device for movement from a position for retaining the associated said lock means in engagement with the closing sleeve to a position for permitting said associated lock means to disengage from the closing sleeve for allowing said second actuating means to pass through the cementing collar.

4. The combination of claim 3 wherein both of said release means are movable to said position for permitting said lock means to disengage from the respective sleeve only upon the application of mechanical force on the respective actuating device from above that actuating device.

5. In a pair of devices for actuating the opening and closing sleeves of a cementing collar to move both of such sleeves from first positions to second positions, comprising: first and second actuating devices for passing through the well pipe to the cementing collar, said first actuating device having lock means for engaging the opening sleeve to move that sleeve to the second position upon downward movement of said actuating device, release means mounted in said first actuating device for movement from a position for retaining said lock means in engagement with the opening sleeve to a position for permitting said lock means to disengage from the opening sleeve for allowing said first actuating device to pass through the cementing collar, said second actuating device having lock means for engaging the closlng sleeve to move that sleeve to the second position upon downward movement of said actuating device, means on said second actuating device for engaging and moving said release means to disengage the lock means of said first actuating device from the opening sleeve, and release means mounted in said second actuating device for movement from a position for retaining the associated said lock means in engagement with the closing sleeve to a position for permitting said associated lock means to disengage from the closing sleeve for allowing said second actuating means to pass through the cementing collar.

6. In a cementing collar device for Well pipe and a pair of means for actuating that device, comprising: a collar assembly having a tubular housing with means for attachment to the well pipe, at least one port in said housing, an opening sleeve means first positioned in said housing for covering said port and movable to a second position for opening said port, a closing sleeve means first positioned in said housing and then movable to a second position for closing said port after said opening sleeve means has moved to said second position for opening said port, frangible means maintaining said opening sleeve means in said first position, and separate frangible means maintaining said closing sleeve means in said first position; first and second actuating means for passing through the well pipe to said collar assembly, said first actuating means having lock means for engaging and moving said opening sleeve means to said second position upon downward movement of said actuating means, release means mounted in said first actuating means for movement from a position for retaining said lock means in engagement with said opening sleeve means to a position for permitting said lock means to disengage from the opening sleeve means for allowing said first actuating means to pass through said collar assembly, said second actuating means having lock means for engaging and moving said closing sleeve means to said position upon downward movement of said actuating means, and release means mounted in said second actuating means for movement from a position for retaining the associated said lock means in engagement with said closing sleeve means to a position for permitting said associated lock means to disengage from the closing sleeve means for allowing said second actuating means to pass through said collar assembly.

7. In a cementing collar device for well pipe and a pair of means for actuating that device, comprising: a collar assembly having a tubularhousing with means for attachment to the well pipe, at least one port in said housing, an opening sleeve means first positioned in said housing for covering said port and movable to a second position for opening said port, a closing sleeve means first positioned in said housing and then movable to a second position for closing said port after said opening sleeve means has moved to said second position for opening said port, frangible means maintaining said opening sleeve means in said first position, and separate frangible means maintaining said closing sleeve means in said first position; first and second actuating means for passing through the well pipe to said collar assembly, said first actuating means having lock means for engaging and moving said opening sleeve means to said second position upon downward movement of said actuating means, release means mounted in said first actuating means for movement from a position for retaining said lock means in engagement with said opening sleeve means to a position for permitting said lock means to disengage from the opening sleeve means for allowing said first actuating means to pass through said collar assembly, means in said first actuating means for preventing said movement of said release means until mechanical force is applied from above said first actuating means, said second actuating means having lock means for engaging and moving said closing sleeve means to said second position upon downward movement of said actuating means, release means mounted in said second actuating means for movement from a position for retaining the associated said lock means in engagement with sail closing sleeve means to a position for permitting said associated lock means to disengage from the closing sleeve means for allowing said second actuating means to pass through said collar assembly, and means in said second actuating means for preventing said movement of the last-mentioned release means until mechanical force is applied from above said second actuating means.

d. In a cementing collar device for well pipe and a pair of means for actuating that device, comprising: a collar assembly having a tubular housing with means for attachment to the well pipe, at least one port in said housing, and opening sleeve means first positioned in said housing for covering said port and movable to a second position for opening said port, a closing sleeve means first positioned in said housing and then movable to a second position for closing said port after said opening sleeve means has moved to said second position for opening said port, frangible means maintaining said opening sleeve means in said first position, and separate frangible means maintaining said closing sleeve means in said first position; first and second actuating means for passing through the well pipe to said collar assembly, said first actuating means having lock means for engaging and moving said opening sleeve means to said second position upon downward movement of said actuating means, release means mounted in said first actuating means for movement from a position for retaining said lock means in engagement with said opening sleeve means to a position for permitting saidlock means to disengage from the opening sleeve means for allowing said first actuating means to pass through said collar assembly, said second actuating means having lockmeans for engaging and moving said closing sleeve means to said second position upon downward movement of said actuating means, means on said second actuating means for engaging and moving said release means to disengage the lock means of said first actuating means, and release means mounted in said second actuating means for movement from a position for retaining associated said lock means in engagement with said closing sleeve means to a position for permitting said associated lock means to disengage from the closing sleeve means for allowing said second actuating means to pass through said collar assembly.

9. In a cementing collar device and actuating means, the combination of: a tubular sleeve mounted in the cementing collar for limited relative movement between first and second positions, said sleeve having an internal upwardly facing shoulder, said sleeve having an internal cylindrical surface, an actuating device for passing through the well pipe to the cementing collar, said actuating device having a body of a size for passing through said sleeve, lock means mounted on said body and having outwardly protruding means for engaging said upwardly facing shoulder of said sleeve, means on said body for sealing with said cylindrical surface of said sleeve for fluid pressure imposed above said actuating device to urge said sleeve from said first position to said second position, and a mandrel mounted in said body for longitudinal movement relative to said body upon the application of mechanical longitudinal force on said mandrel, said mandrel having means for permitting inward movement of said lock means upon said longitudinal movement of said mandrel relative to said body for disengaging said lock means from said sleeve shoulder to permit the actuating device to pass through said sleeve.

10. The combination of claim 9 wherein frangible means joins said sleeve and the cementing collar in said first position for preventing movement to said second position until the fluid pressure imposed above the actuating device reaches a predetermined magnitude.

11. The combination of claim 9 wherein frangible means joins the said mandrel to said body for preventing relative longitudinal movement therebetween until such mechanical force reaches a predetermined magnitude.

12. The combination of claim 9 wherein said lock means includes a split ring having a normal outside diameter at least smaller than the minimum internal diameter of said sleeve, and a plurality of movable means are positioned in said body between and engage said ring and said manrel for retaining said ring in the outwardly protruding position for engaging said shoulder.

13. In a device for actuating a downwardly movable opening or closing sleeve of a remotely located cementing collar to move such sleeve from a first position to a second lower position wherein the sleeve has an upwardly facing exposed shoulder, the combination of: a tubular body, lock means mounted on said body and having outwardly protruding means for engaging said upwardly facing exposed shoulder of the sleeve of the cementing collar upon downward movement of the body into the cementing collar for transmitting downward force on the body to the sleeve, means for. sealing between the said body and the sleeve, and a mandrel mounted in said body for longitudinal movement relative to said body upon application of mechanical force from above and having means for permitting disengagement of said lock means from the sleeve shoulder upon such longitudinal movement to permit the device to pass through the cementing collar.

14. The combination of claim 13 wherein frangible means join said mandrel and said body for preventing said longitudinal relative movement therebetween until such moving force reaches a predetermined magnitude.

References Cited by the Examiner UNITED STATES PATENTS 2,925,865 2/1960 Oliver 166-154 3,042,116 7/1962 Sharp et al. 166224 3,044,553 7/1962 Bradley 166-184 CHARLES E. OCONNELL, Primary Examiner.

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Referenced by
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Classifications
U.S. Classification166/194, 277/336
International ClassificationE21B33/14, E21B33/13
Cooperative ClassificationE21B33/14
European ClassificationE21B33/14