US2077022A - Apparatus for the controlled placement of fluid in wells - Google Patents

Description

April 13, 1937. `M. SPENCER lET AL 2,077,022

APPARATUS FOR THE CONTROLLED PLACEMENT OF FLUID IN WELLS Gli/komm;

April 13, 1937. M. SPENCER ET Al.

APPARATUS FOR THE CONTROLLED PLACEMENT OF FLUID IN WELLS 2 sheets-Sheet 2 Filed June 22, 1956 .A EHHMW www f m @fm am 66av944 56, 3 4v c d d Irv@ fw fw b /fv n/ W 9 .W m M XNN J r. d MH w ,0. C 8 7 7m@ /mm fmmmw 17W, .mam m 5 C m, ,321m Q jf wllulllldltunhu Patented pr. 13, 1937 UNITED STATES PATENT OFFICE APPARATUS FOR THE CONTROLLED PLACE- MENT OF FLUID IN WELLS Meredith Spencen'Whittier, and Joseph R. Beauchamp, Pico, Calif., assignors to O. P. Yowell Service Company, a corporation of California 'Application June 22, 1936, Serial N0. 86,620

20 Claims.

. perforated casingor screen pipe which is placed in the producing zone of an oil well is, under certain circumstances, subject to corrosive action 15 which clogs the perforationsand reduces the production of the well. Also, in certain types of oil carrying a high asphalt content, the perforations become gummed or clogged with asphalt. It `ls. therefore, necessary in order to maintain the de- ,20 sired production ,level to clean the perforations from .time to time. vVarious devices have been designedk for this purpose and the device contemplated by this invention is particularly applicable to this use since it is designed so that any fluid 25'such, for example, as a solvent for the material which is clogging the perforations or a reagent which will react chemically with such material, may be delivered under pressure into a confined space in the perforated pipeV to dislodge and remove the. obstructions in theperforations. The device contemplated by this invention also lends itself to use in loosening a liner or perforated pipe by forcing a suitable fluid under pressure through the perforations in successlve'regions of such a pipe with the material surrounding the pipe.

Itis a primary object of this invention to produce a device of the class described which can be operated from the surface of the ground so as 40. to control the amount of fluid which is discharged therefrom for each setting or location of the tool.

One preferred embodiment of our invention contemplates the use of pumping means embodied within the tool itself and operated upon vertical reciprocation of the delivery pipe, which carries the tool, to discharge the cleaning iiuid in pre- A As is Wellknown to those familiar with the art,`

trolled by raisingor lowering the deliveryrpipe.

Our invention, therefore, in its broader aspect contemplates the formation of a confined space within the well and means for controlling theV discharge of pressure iluid into such conned space.

It is a further object of this invention to produce a device2 of the class described which is of simple form and construction, may be economically manufactured and easily operated with the standard equipment available at the well.

The details in the construction of certain preferred embodiments of our invention, together with other objects attending its production will be best understood from the following descrip-` tion of the accompanying drawings which are chosen ,for illustrative purposes only and in which Fig. lis a sectional elevation through the perorated casing of an oil Well and illustrating one preferred embodiment of our invention suspended therein;

Fig. 2 is an enlarged sectional elevation taken on a plane represented by the line 2-2 of Fig. 1

. and illustrating further details in the construction of an initial step in the operation of a preferred embodiment of our invention;

i Fig. 3 is a sectional elevation similar to Fig. 1 illustrating a second step in the operation of the tool shown in Fig. 1;

Fig. 4 is a sectional elevation similar to Fig. 1 illustrating a third step in the operation of the Vtool contemplated by this invention;

'Flg. 5 is an enlarged sectional elevation with parts in outside view taken in a plane represented by the line 5 5 of Fig. 1, and illustrating further details inthe construction of the packing assembly which forms the confined space within which the pressure fluid is discharged;

Fig. 6 is a plan section taken in a plane represented by the line 6-6 of Fig. 2;

Fig. 7 is a plan section taken in a plane represented by the line 1-1 of Fig. 2;

Fig. 8 is a sectional elevation through an oil well illustrating a modified form of our invention in connection therewith;

Fig. 9 is an enlarged sectional elevation taken in a plane represented by the line 9-9 of Fig. 8; and l illustrating a modification inthe construction shown in'Fig. 2.

More particularly describing the invention as herein illustrated, reference numeral Il indicates an oil well which contains a perforated cas# ing l2. Suspended Within the casing I2 through the medium of what we may term a delivery Fig. 10 is a fragmentary sectional elevation pipe I3 is a iiuid discharging tool generally indicated by reference numeral I4. in this form of our invention embodies an extension I5 of the delivery pipe connected thereto through the medium of a collar I6, such extension I5 being hereinafter referred to as the fluid control chamber. l

The collar I6 is formed with a valve seat I1 upon which a control valve I8 is adapted to rest. The control valve I8 in this form of our invention is shown as being provided with a downwardly extending stem I 9 which extends through a passage in a plug member 2I mounted in the top of a working barrel 22 which in turn is mounted in spaced concentric relation with the control chamber I5. The bottom of the control chamber I5 is provided with a bushing or closure fitting `24 which supports the lower end of the working barrel as indicated at 25 and the bottom portion of the working barrel 22 is in open communication with the control chamber I5 through ports 26. Reference numeral 21 indicates a ring or spider member which holds the top of the working barrel 22 in properly spaced relation with the interior of the chamber I5, such member 21 being formed with passages 28.

In this form of our invention as will be seen from the description of the operation to appear hereinafter, it is important that means be provided for sealing the space between the valve stem I9 and the interior of the working barrel 22 during certain stages of the operation. vThis may be accomplished in various ways and in the form shown in Figs. 2 to 4 inclusive, the lower end of the stem I9 is provided with a second valve 38 adapted to have sealing engagement with a seat 3I formed in the bottom of the plug 2I which constitutes the top of the working barrel. This valve as will appear hereinafter serves a dual purpose in this form of our invention. The valve stem I 9 may be further sealed by a stuiling box 20', the use of which is optional when the valve I9 is used. Also, if the stuffing box 20' is used the seal effected thereby may be sufficient and the valve I9, as will appear hereinafter maybe replaced with a cross member of any suitable type.

Reference numeral indicates what we have termed a tubular member which is telescopically connected with the flow control chamber 32, the tubular member extending upwardly into the chamber through the stuffing box generally indicated by reference numeral 36. This tubular member 35 which is shown as being comprised of sections 35a, 35h and 35e carries a pair of spaced packers 38 and 38 which are mounted on the section 35h andv which engage the casing I2 to form a confined space therein. The bottom portion of the section 35h is provided with a plug 40 which is shown as containing the lower end of a by-pass pipe 4I, the upper end of which opens through the wall of the tubing section 35h at a point above the uppermost packer 38 as indicated at 42. 'Ihe wall portion of the section 35h between the packers 38 and 38 is provided with an outlet opening or a lplurality of such openings generally indicated by reference numeral 44. y Mounted on the upper end portion of the tubing section 35a which telescopes into the flow control chamber I5, and, in this form of our invention, iscontained Within the Working barrel 22, is a plunger member 41. Reference numeral 48 -indicates an upwardly opening check valve which is shown as being contained Within The tool I4 lao'mo'aa the top portion of the tubing section 35a, such valve being so positioned and arranged as to establish communication between the regions of the working barrel above and below the plunger 41 when such valve is open. Numeral 49 indicates a downwardly opening check valve which is situated between the valve 48 and the discharge ports 44. Reference numeral 50 indicates a slip assembly which is shown as being carried by the lower section 35e of the member 35. This slip assembly may be of any conventional construction and is shown as comprising a tapered mandrel member 50' rigidly mounted on the section 35C and spaced collars 5I and 5I' slidably mounted on such section through the medium of a sleeve 52. The collars 5I and 5I support the ends of pipe engaging friction springs 53 and the upper collar also carries links 54 which have their free ends secured to slips 55 slidably mounted on the mandrel section 50'. The sleeve 52 is provided with a bayonet slot 56 which cooperates with a pin 51 mounted on the section 35C to hold the slips in retracted position when the pin is in the offset portion of the bayonet slot and to permit downward movement of the section 35e and its associated expanding mandrel 50' when the pin is in the long portion of the` bayonet slot. For the purpose of transmitting rotation from the delivery pipe I3 to the tubular member 35 to release the slips, the section 35a of this member is provided with a lug 58 adapted for reception in a notch 59 in the closure plug 25 which forms the bottom of the working barrel.

In the operation of the device shown in Figs. 2 to 4 inclusive, the tool is suspended in the well with the slips retracted as shown in Fig. 1 and while in a freely suspended position the telescoping connection comprised of the section 35a and the chamber I5 is fully extended with the lug 58 in the notch 59, the plunger 51 being in its lower end of the working barrel and the valve I8 resting on its seat I1. The delivery pipe I3 is made up in the conventional manner as the tool is lowered into the well and when it reaches apoint at which it is desired to clean the perforaapplication of weight will cause the slips to expand into biting engagement with the pipe and through such engagement to support the tubular member 35 at this point within the well. At this time or any time prior thereto the fluid or fluid mixture in any desired quantity is delivered into the delivery pipe I3.

With the slips set in the manner described above and the pipe I 3 containing the desired quantity of fluid, the pipe I3 is then lowered, such lowering movement being effective to completely collapse the telescoping connection to the point shown in Fig. 2. At this point it will be observed that the upper end of the tubing section 35a has engaged the second valve 3D on the lower end of the valve stem and through such engagement has forced the rst valve I8 away from its seat I1. With the parts in this position the uid contained in the delivery pipe I3 flows downwardly past the valve and through the passages 28 into the space between the plunger barrel 22 and the pipe section I5, through the openings' 26 and up into the plunger barrel to a point immediately below the plunger 41.

'Ihe next operation is to raise the delivery pipe a distance corresponding to the stroke of the ,cenone plunger during which operation the weight of the fluid in the pipe i3 closes the valve it and the plunger lll, during its downward' movement,-

creates a suction in the top portion of the plunger.r

t barrel which draws the fluid in the bottom portion of the plunger barrel up through the upwardly opening check valve tt into the top portion of the plunger barrel. This operation is villustrated in Fig. 3. a

lo The next operation in this form of our invention is to again Ylower the delivery pipe a distance corresponding to the stroke of the plunger.'

This lowering movement causes the collapse oi the telescoping connection and the contraction of the space in the top of the plunger barrel. In the .event the pressure in the zone to which the fluid is to be delivered is greaterthan the y weight of the fluid above the Valve it, the contraction in the space in the top portion of the plunger barrel through the operation just devalve it and permits thel flow control chamber i5' It will thus be seen that with thisarrangement our invention to iill during the down-stroke.

provides a device in whichxa predetermined quantity of fluid is delivered into the confined space between the packersior each `strolte of the plunger and the quantity/"of fluid so delivered can be governed by the size' of the control chamber and its associated working barrel and the `number 40 of strokes for each settin'gof the tool..

In the form of our invention shown in Figs. 8 and 9 we provide a somewhat simplied construction which requires the delivery pipe to contain fluid under suilicient pressure tov overcome thev well pressure at the point ci discharge. In this form of our invention the perforated pipe, the f packing and slip assemblies and the tubing sec` tions which carry the packing and slip assemblies are identical with those shown in Fig. 1 and are,

. therefore, indicated by the same reference numerals distinguished by the letter m.

The delivery pipe ibm in this form of our invention is shown as being provided at vits upper end with a swivel head connection t@ of any convention-al type such connection being connected through the medium of a conduit til to a pump Cil diagrammatically indicated at tt. The bottom of the delivery pipe ism is connected through a collar ttm with a bottom section ibm which con stitutes the ow control chamber in this form of our invention. l

'Ihe bottom of the flow control chamber ibm carries a stuffing box ttm through which a top section tta, of the tubular member ttm extends.

V As shown in Fig. ri the tubing member ttm is comprised of sections tta, btb and ttc corresponding to sections tta, ttl; and ttc in Fig. 1. The top of 'the section tta. carries a nut member tt having a boss tt adapted to fit in a recess ttf for actuating the slip releasing mechanism, such not being shown as provided with a bridge plate tt.

The collar ltm is provided with a valve seat Ilm y upon which a valve lm is adapted to rest, the valve ttm being provided with a downwardly extending stem Wm which is supported in a guide hub t@ formed in a4 spider member l0.

The tubular member tbm is provided with a downwardly opening check valve which in this form of our invention is shown as comprising a disc valve I2 which engages a seat I3 formed inA the bottom of a valve housing It, the valve 'it being supported in pressurev engagement with the seat by means of a stem` lb which extends upwardly through a support 'it and carries a compression spring. 'il on its upper end between the top of the support It and a cross pin 718g. Y

In this form of our inventionthe tool is loweredV into the well and the slips are set in the. same manner described above-in connection withFigs. l. to d inclusive. After the tool has .been set, the washing or cleaning fluid is pumped into the delivery pipe itim at the desired pressureirom the pump t2, it being understood that the pressure used must necessarily be in/ excess of thev rock pressure of the particular zone to be cleaned. The

delivery pipe is then lowered until the cross fingers tt on the lower end of the valve stem ibm. engage the bridge plate 66 at which time the valve ttm is raised from its seat to ypermit theflow of fluid a downwardly into` the'control chamber from which it is admitted to thetubing section )tta-and isf j discharged through the valve Wand theiassociated connections into the conned space betweenthe fpackers 33m .and 38'm..yThe.;operation:of the pump .or suitable measuring mea-ns1 associated c raised itwill be seen thatthe Vpressure-,of y.the'fluidl ,i

therein will be effectivetdclose the valve 18m and prevent the further. discharge; vof fluid intof the confined space. f

It will-beapparent to artv that the complete toolv assembly in either embodiment of our invention` can be raised to successively higher levels and lowered again to set the slips so that any desired length of casing can be cleaned in the manner described-above.

In the form of our invention shown in Fig. 10, we show a slightly modified construction in the control chamber and the working barrel. In this form of our invention it will be observed that the collar memberv 86 which connects the delivery pipe l and the control 'chamber t@ is not provided with a valve as was the casein Figs. v2 and 9. The working barrel B9 is similar to the working barrel 22 in that it communicates with the chamber dt at its lower end through openings et, but the upper end'of the worlring barrel t9 is shown as being provided' with a closed plug di.

The tubular member inthis form of our invention together with the plunger and its associated check valves are identical with those shown in Fig. 2 and the parts thereof are indicated by the same reference numerals distinguished by the letter d. In the use of this modified forni of ccnstruction, it is important lthat the tool be immersed' fora substantial distance within the huid of the well before the cleaning fluid or solution is delivered into the delivery pipe 'tl and when such cleaning fluid. is delivered into the pipe tl, it is preferable that the level of fluid therein be below the Huid level in the well surrounding the pipe.

those familiar with the of the tool was .in favor of the liquid in the delivery pipe. Otherwise, the operation of the modification shown in Fig. 10 is the same as was described above in connection with Figs. 2, 3, and 4.

It is to be understood that while we have herein described and illustrated certain preferred embodiments of our invention, that the invention is not limited to the precise forms or applications described above, but includes Within its scope whatever changes fairly come within the` spirit of the appended claims.

We claim as our invention:

1. An apparatus for cleaning perforated pipe and the like embodying: packing meansradapted to engage the interior of said pipe and form a confined space therein; a tubular member supporting said packing means and having open communication with said confined space; a fluid delivery pipe having a flow control chamber at its lower end telescopically connected to said tubular member; and a valve in the top of said control chamber adapted to be opened by engagement with the top of said tubular member when said telescoping connection is collapsed.

2. An apparatus for cleaning perforated pipe and the like embodying: packing means adapted to engage the interior of said pipe and form a confined space therein; a tubular member supporting said packing means and having open communication with said confined space; slip means for supporting said tubular member in said perforated pipe; a fluid delivery pipe having a control chamber at its lower end lcelescopically connected to said tubular member; and a valve inthe top of said control chamber adapted to be opened by engagement with the top of said tubular member when said telescoping connection is collapsed.

3. An apparatus for cleaning perforated pipe and the like embodying: packing means adapted to engage the interior of said pipe and form a confined space therein; a tubular member supporting said packing means and having open communication with said confined space; a fluid delivery pipe having a ow control chamber at its lower end telescopically connected to said tubular member; a valve in the top of said control chamber adapted to be opened by engagement with the top of said tubular member to supply fluid to the control chamber from the delivery pipe when said telescoping connection is initially collapsed; and piston means in said control chamber adapted to force fluid contained in said control chamber downwardly through said tubular member upon a second collapsing movement of said telescoping connection.

4. An apparatus for cleaning perforated pipe and the like embodying: packing means adapted to engage the interior of said pipe and form a confined space therein; a tubular member supporting said packing means and having open communication with said confined space; a uid delivery pipe having a ow control chamber at its lower end telescopically connected to said tubular member; valve means interposed between said flow control chamber and the portion of said {delivery pipe thereabove; and meansl operable upon the collapse of said telescoping connection for opening said valve means.

5. An apparatus for cleaning perforated pipe and the like embodying: packing means adapted to engage the interior of said pipe and form a confined space therein; a. tubular member supporting said packing means and having'open communication with said confined space; a iiuid delivery pipe having a flow control chamber at its lower end telescopically connected to said tubular member; valve means interposed between said flow control chamber and the portion of said delivery pipe thereabove; means operable upon the collapse of said telescoping connection for opening said valve means and a downwardly opening check valve positioned between the interior of said control chamber and the portion of said tubular member which communicates with said confined space.

6. An apparatus for cleaning perforated pipe and the like embodying: packing means adapted to engage the interior of said pipe and form a confined space therein; ,a tubular member supporting said packing means and having open 4communication with said confined space; a fluid delivery pipe having a iiow control chamber at its lower end telescopically connected to said tubular member; valve means interposed between said flow control chamber and the portion of said de- V f porting said packing means and having open communication with said confined space; a fluid delivery pipe having a flow control chamber at its lower end telescopically connected to said tubularmember; valve means interposed between said flow control chamber and the portion of said delivery pipe thereabove; means operable upon the collapseof said telescoping connection for opening said valve means; a downwardly opening check valve in said tubular member above the opening which communicates with said coniined space; a working barrel within said flow control chamber having inlet openings at its lower end communicating with the interiorof said chamber; a plunger on said tubular member Within said working barrel; and an upwardly opening check valve in said tubular member between the region of said working barrel below said plunger and the interior of said tubular member.

8. An apparatus for cleaning perforated pipe and the like embodying: packing means adapted to engage the interior of said pipe and form a conned space therein; a tubular member supporting said packing means and having open communication Withfsaid confined space; a fluid delivery pipe having a ow control chamber at its lower end telescopically connected to said tubular member; a valve seat positioned between said .flow control chamber and said delivery pipe; a valve resting on said seat; a downwardly extending stem on said valve; and means on said stem adapted to be engaged by the upper end of said tubular member upon the collapse of said telescoping connection for opening said valve.

9. In an apparatus for cleaning perforated pipe and the like, the combination of: packing means adapted to engage the interior of said pipe and form a conned space therein; a tubular member supporting said packing means and having open communication with said confined space;

aovaoaa a duid delivery pipe having a now control chamber a't its lower end, telescoplcally connected with said tubularmember; a working barrel mounted in said flow control chamber and having an inlet opening at its lower end \-c ommunicating with said ow controlgch'amber; and plunger and valve means carried by said tubular member for drawing fluid from the bottom of said working barrel into the upper end thereof during extension of said vvtelescoping connection and forcing fluid downwardly from the upper end of said working barrelthrough saidtubular member during the collapse of saidtelescoping connection.

10.`In an apparatus 'for cleaning perforated pipe and the like fthe-combination of packing means adapted `*fc-:ngagethe interior of said pipe and forma confinedspace therein; a tubular member-'supporting'said packing means and having open-communication with said conilned' space;.afluid delivery pipe having a now control chamber'I at its: lower endl telescopically connected with saidxgtubularmember; a working y barrel` 'mounted in` said now control chamber and :having anf L communicating Vdii'ow control chamber; f l plungermean" said tubular member inysaidmwork 4 'fan upwardly opening ed .with said plunger means betweenthe regions of said working .barrelfabove and below said' plunger; and. a doiwnwardlyjopening check valve in said bovethe opening which corni idfconned space. i apparatusfifor cleaning perforated pipe and; flikal'erribodying: packing means adapted toiengage the interiorfof said pipe and form a i con ned-l space therein; a tubular member, supf prby'ng said; packlngzmeans and having open communication fvnffthsaid confined space; a uid deliverypipe having a ow control chamber at its -lowerend telescopically connected with said `tubularmembergf@a `working barrel mounted in said'fflow--control'chamber communicating with 1 said chamberat its lower end; a valve seat betweensaidg-delivery pipe and said control chamber abovefsaidfworking barrel; a valve resting on saidseat; a ystem. on said valve extending `downwardly through the top of said working barrel; Aafsecond valve on said stem within said Aworking barrelsa second valve seat in the top of said working barrel adapted to be engaged by said second valve;`and valve and plunger means carried by saidtubular member within said working barrel. f

12. An apparatus for cleaning perforated pipe and the like embodying: packing means adapted to engage the interior of said pipe and form a confined space therein; a tubular member sup- 70 through the top of said working barrel; means on the lower end of said valve stem adapted for engagement with the to-p of said tubular member upon the collapse of said telescoping connection for opening said valve; sealing means between 75 the top of said working barrel and said valve stem;

eningV at its lower endv and valve landplunger means carried by said tubular Amember within said working barrel.

, 13. In an apparatusY for the controlled placement of fluid in wells and the like, the combina,- tion of: a fluid delivery pipe having a flow control chamber at its lower end; a tubular member telescopically connected with said flow control chamber, said tubular member having an outlet port in its wall; packing means mounted on said tubular member above and below said outlet port; slip means for supporting said tubular member in a pipe to be cleaned; valve means interposed between said flow control chamber and said delivery pipe; and means operable upon the collapse of said telescoping connection for opening said valve means.

14. In an apparatus for the controlled placement of fluid in wells and the like, the combination of: a uid delivery pipe having a flow control chamber at its lower end; a tubular member tel'e'scopically connected with said flow control chamber, said tubular member having an outlet port in its wall below said flow control chamber; packing means on said tubular member above and below said outlet port; slip means for supporting said tubular member in a pipe to be cleaned; means operable upon the collapse of said telescoping connection for delivering fluid from said delivery pipe to said chamber; and additional means operable during the collapse of said connection for discharging fluid from said chamber through said tubular member.

15. In an apparatus for the controlled placement of fluid in wells and the like, the combination of a uid delivery pipe having a ow control chamber at its lower end; a tubular member telescopically connectedv with.said flow control chamber, said tubular member having an outlet port in its wall below said flow control chamber; packing means o-n said tubular member above and below said outlet port; slip means for supporting said tubular member in a pipe to be cleaned; means operable upon the collapse of said telescoping connection for delivering fluid from said delivery pipe to said chamber, and additional means operable during the collapse of said connection for discharging duid from said chamber through said tubular member, said last mentionedmeans including a working barrel mounted in said chamber and communicating therewith at its lower end, and plunger and valve means carried by said tubular member within said working barrel.

16. In an apparatus for the controlled placement of fluid in wells and the like, the combination of: a fluid delivery pipe having a flow control chamber at its lower end; a tubular member telescopically connected with said flow control chamber, said tubular member having an outlet port in its wall below said flow control chamber; packing means on said tubular member above and below said outlet port; slip means for supporting said tubular member in a pipe to be cleaned; means operable upon the collapse of said telescoping connection for delivering iluid from said delivery pipe to said chamber; and additional means operable during the collapse of said conregions of said working barrel above and below said plunger.

17. In an apparatus for the controlled placement of iluid in wells and the like, the combination of: a uid delivery pipe having a flow control chamber at its lower end; a tubular member telescopically connected with said flow control chamber, said tubular member having an outlet port in its wall below said ow control 10 chamber; packing means on said tubular member above and below said outlet port; slip means for supporting said tubular member in a pipe to be cleaned; means operable upon the collapse of said telescoping connection for delivering uid from said delivery pipe to said control chamber;

and additional means operable during the collapse of said connection for discharging iluid from said chamber through said tubular member, said last mentioned means including a working barrel mounted in said chamber and communieating therewith at its lower end, a plunger on said tubular member within said. working barrel; an upwardly opening check valve communieating between the regions of said working barrel above and' below said plunger; and a down.

wardly opening check valve ,mounted in said tubular member at a point between said upwardly opening check valve and said discharge port.

18. In an apparatus for the controlled placement of uid in wells and the like, the combination of a fluid delivery pipe having a ilow control chamber at its lower end; a` tubular member telescopically connected with said flow control chamber, said tubular member having an outlet in its wall below said flow control chamber; packing means on said tubular member above and below said outlet port; means for supporting said tubular member in a pipe to be cleaned; means comprising a valve operable upon the co1- aovaoaa lapse of said telescoplng-connection for controlling the admission of uid from said delivery pipe to said ilow control chamber; and additional means operable during the collapse of said connection for discharging uid from said chamber through said tubular member.

19. In an apparatus for the controlled placement of fluid in wells and the like, the combination oi': a Huid delivery pipe having a ow control chamber at its lower end; a tubular member telescopically connected with said ow control chamber, said tubular member having an outlet port in its wall; packing means mounted on said tubular member above and below said outlet port; slip means for supporting said tubular member in a pipe to be cleaned; valve means interposed between said ilow control chamber and said delivery pipe; means operable upon the the collapse of said telescoping connection for opening said valve and means forl delivering a pressure fluid to said delivery pipe.

20. In an apparatus for the controlled placement of fluid in wells and the like, the combination of: spaced packers adapted to engage the interior of said pipe and forma confined space therein; a tubular member supporting said packers, said tubular member having a wall port communicating with said conned space; a iluid delivery pipe having a flow control chamber at its lower 'end telescopically connected with said tubular member; slip means for supporting said tubular member in a pipe to be cleaned; and means associated with said control chamber and operable upon downward movement thereof relative to said tubular member for controlling the discharge of pressure fluid from said control chamber through said tubular member.

MEREDI'IH SPENCER. JOSEPH R. BEAUCHAMP.

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