US2109745A

US2109745A - Well testing apparatus

Info

Publication number: US2109745A
Application number: US22531A
Authority: US
Inventors: Landes H Hayward
Original assignee: Individual
Current assignee: Individual
Priority date: 1935-05-21
Filing date: 1935-05-21
Publication date: 1938-03-01
Anticipated expiration: 1955-03-01

Description

March 1, 1938. L. H. HAYWARD WELL 'iES'I-ING APPARATUS Filed May El, 1955 ATTORNEY.

of the material to be tested, the drill pipe is low- Patented Mar, 1, 1938 UNITED STATES PATENT OFFICE -2,109,74 5 WELL TESTING APPARATUS Landes H. Hayward, Long Beach, Calif. Application May 21, 1935, Serial No. 22,531

19 Claims.

This invention relates to improvements in well testing apparatus and particularly to devices used in connection with oil wells for making water shut-off, formation, and other tests incident to the drilling thereof. v

My improved testing device is adapted to be attached to the lower end of a string of drill pipe from which the drilling bit has been removed, for the purpose of making possible the controlled admittance of materials to be tested upwardly thereinto. Broadly, the device includes a cylinder, from which depends a hollow elongated member, bearing a strainer on its lower end in advance of a packer. The hollow elongated member extends upwardly into the cylinder through packing means carried thereby, and is closed at its upper end, with outlet openings leading through its side Walls. A spring acts on said elongated member to normally retain the outlet openings in advance of the packing means, thereby excluding fluid from entering the cylinder above said packing means. When the packer is made to engage the walls of the well and it is desired to take a sample ered and the packing means correspondingly moved downwardly over the elongated member to uncover the outlet openings therein, thus permitting the flow of fluid into the cylinder from whence its flow into the drill pipe is controlled in a manner hereinafter described.

An object of the invention is the provision of a testing tool embodying a valve structure of the character described, whereby to eliminate com-. plicated valves and by-pass constructions commonly employed in this type of tool; and to provide such a testing device which is operable by the vertical movement of the drill pipe.

Another object of ,the invention is the provision of a closure above the packing means, for restraining the mud-laden fluid against flowing upwardly into the drill pipe, should the valve structure be prematurely operated as the tool isbeing lowered into the well; to further provide a closure which is adapted to be broken at the proper time, as by dropping an element down the drill pipe.

A further feature of the invention resides in the provision of a chamber below the packing means, into which the mud-laden fluid can flow from the hollow elongated valve member, whereby to provide a hydraulic cushion forfacilitating the smooth movement of said packing means past the outlet openings through said elongated member Another feature of the invention is the proviview taken as indicated well. 5

A still further object of the invention is to provide a device which can be used for obtaining tests at any level between the surface and bottom of a well, and which is compact, reliable, and economical to manufacture and maintain.

My invention possesses many other advantages and has other objects which may be made more easily apparent from a consideration of one embodiment thereof. For this purpose I have shown one form in the accompanying drawing and forming part of the present specification. I shall now proceed to describe this form in detail, which illustrates the general principles of my invention; but it is to be understood that this description is not to be taken in a limiting sense, since the scope of the invention is best defined in the appended claims.

In the drawing:

Figure 1 shows the lower end of my testing apparatus in position withina well casing and about to be operated for taking a water shut-off test.

Figure 2 shows the upper portion of the testing apparatus within the well casing.

Figure 3 is an enlarged fragmentary sectional view through the well casing, showing therein the 30 cooperative ends of the well packer and plunger member for expanding the same.

Figure 4 is an enlarged transverse sectional by line 4-4 of Figure 1.

Figure 5 is an enlarged transverse sectional view taken as indicated by line of Figure 2 and,

Figure 6 is an enlarged transverse sectional view taken as indicated by line 6-6 of Figure 2.

The embodiment of my testing apparatus illustrated in the drawing, is shown positioned within the lower end of'the well casing 40, just above the rat-hole II, for making a water shut-off test, the casing having been cemented in as at 12.

Referring particularly to Figure 2, the apparatus comprises upper and lower cylinders l3 and H, the adjacent ends of which are threaded onto an inside coupling IS. The lower end of the cylinder I4 is provided with an annular interior shoulder l6 and a stumng box i1 therebelow.

A plunger member l8 has a longitudinal opening l9 therethrough and extends through the stufiing box I! into the lower end of the cylinder I. It is provided with an enlarged end 20 which bears against the annular shoulder l6. Said plunger l8 depends from the lower end of cylinder l4 and is threaded into one end of a coupling 2| (Figure 1) which has an opening 22 therethrough. Said coupling has formed on its lower end, a threaded pin 23 which screws into a threadedbox 24 of the plunger head 25. The plunger head has an opening 26 therein and is internally threaded at its lower end to receive the upper threaded end of a hollow tubular member 21, which bears a perforated nipple or strainer 29 on its lower end and a packer generally designated 30, which will hereinafter be more fully described. The enlarged upper end of plunger I3 is internally threaded to receive the lower threaded end of a hollow tubular stem 3|, which extends upwardly through the inside coupling l5 and in sliding engagement with packing 32 carried therein. A cylindrical cup into the lower end of the cylinder l3 and is provided on its lower end with a threaded neck 34 which screws into the upper end of the coupling l5 and against the packing 32. Said cup'serves to shield the lower end of the cylinder l3 against being cut away by the flow of abrasive-laden fluid through outlet openings 35 in the hollow stem 3|, when they are rendered communicative with the interior of said cylinder upon the downward movement of coupling l5 and its packing 32. The outlet openings are transversely disposed in the side walls of the hollow stem 3| which is closed at its upper end. A compression spring 35 is provided within the lower cylinder |4 between the coupling [5 and enlarged end 20 of the plunger I8, for the purpose of normally retaining the outlet openings 35 below the packing 32.

A secondary sealing unit generally designated 38, is interposed between the upper end of the cylinder l3 and the lower end of a drill pipe 39, for insuring against the flow of fluid into said drill pipe should the sliding valve structure heretofore described be prematurely operated. Said sealing unit comprises upper and lower

cylindrical sections

40 and 4|, which are connected by a coupling 42 into which they are threaded. The upper end of section 40 is provided with a threaded box for receiving the threaded pin 43 of a coupling 44. Said coupling has an opening 45 therein and is internally threaded at its upper end to receive the threaded end of the hollow drill pipe 39. The lower end of section 4| is provided with a threaded pin 46 which screws into a threaded box 41 formed in the upper end of cylinder l3. An opening 411! in cylinder |3- provides communication between the cylinder l3 and the interior of the sealing unit. An interior tubular member 48 has an opening 43 therein and is supported by an annular flange 50 thereon, which is held between the adjacent ends of the

sections

40 and 4|. The upper end of said opening is enlarged to define an annular seat 5| for supporting a disc 52, and is threaded to receive a nipple 53 which serves to hold said disc against the annular seat and is provided with an opening 54 somewhat smaller than the opening 49. Thus, it will be seen, that the bearing surface on top of the disc is greater than that on the bottom thereof. Furthermore, a beveled boss is formed on the underside of the disc and is "in the nipple. The above construction and arrangement of the disc and its supporting members, renders said disc capable of withstanding any hydraulic pressures from beneath and at the same time permits it to be easily broken from above as by dropping an element down the hol- 33 fits snugly its operation relative low drill pipe. Such an element is indicated by dotted lines as at 55 in Figure 2 of the drawing, and is adapted to strike the plunger 56, which in turn strikes and breaks the disc 52. The head of the plunger is provided with a number of openings 51 through which fluid is permitted to flow into the drill pipe, and the striking end thereof is normally held slightly above the disc by a spring 51a. A perforated plate 58 is positioned beneath the disc within the lower cylindrical section 4|, for the purpose of catching the disc fragments.

Thewells in which applicants testing apparatus is employed, are usually filled with mud-laden fluid whose hydraulic pressure is often in excess of the head upon the formation fluids to be tested, and would prevent their flow into the apparatus, were it not for some means of sealing or packing off the hole above the strainer on the end of the hollow tubular member 21. Furthermore, without such a packer it would be impossible to obtain an uncontaminated sample of the fluid to be tested.

Various types of packers might be used on applicants testing device, depending upon the character of the well and the nature of the test to be made. However, a packing apparatus such as is shown in Figure l of the drawing, is particularly well adapted for use with applicants tool when used within a well casing. Its constructionis well known and will therefore only be briefly hereinafter described, for the purpose of making clear to the rest of the testing apparatus.

In Figure 1, the packing device. generally designated 30, is carriedon the hollow tubular member 21 depending from the lower end of the plunger 18. Said tubular member carries a pin 59 which extends into the short arm of an angle slot 60 formed. in a sleeve 6|, which in turn carries a plurality of upwardly extending slips 52. Said slips are connected through links 63, to

a collar 64, rotatably mounted on the upper end of the sleeve 6|, and enter tapereddove-tailed grooves 65 formed in the lower skirt of an expansible packer 61. The sleeve 6| also carries a lower stationary collar 68 and an upper slidable collar 69, which are connected by spring anchor strips 10 adapted to bear against the inner wall of the casing "I. These anchor strips frictionally retain the sleeve 6| in place within the casing as the slips are moved into and out of engagement therewith by the vertical movement of the expansible packer 61. The packer skirt 56 surrounds the hollow tubular member 21 and is spaced therefrom to permit the flow of fluid therebetween. It is provided on its lower end with inwardly extending lugs 1| which the member 21 and rest upon an nnular shoulder ,1|a formed exteriorly thereof. A plurality of expansible packing rings 12 are positioned between the upper end of the skirt 65 and the packer head 13, which in turn carries a depending sleeve shown in the drawing preparatory to being lowbear againststrikes and breaks the disc 52.

ered into a well, which is usually filled with mudladen fluid. The spring strips 10 are contracted into the casing as the apparatus enters the same. The lowering of the apparatus into the well is facilitated by the ability of the mud-laden fluid to pass upwardly through the space defined between the outside of the tubular member 21 and the expansible packer 61. It should be understood that the weight of the plunger member I8 together with the packing apparatus carried therebelow, is suspended from the shoulder l6 formed within the lower cylinder I 4. The compressive resistance of the spring 36 is sumcient to normally restrain the plunger I 8 from rising in the cylinder M as the apparatus is moved downwardly in the well.

When the apparatus has been lowered to the desired elevation, the drill pipe is rotated slightly until the pin 59 of the tubular member 21 is moved into alignment with the vertical arm of the slot 60 in the sleeve 6|, it being understood that said sleeve is supported by the frictional engagement of the spring strips 10 with the casing wall. Upon further lowering of the drill pipe, the expansible packer 61 moves downwardly with the tubular member 21 and urges the slips outwardlyinto engagement with the casing, where they serve as supports for said packer as the packing rings thereof are expanded to seal off the casing. This is accomplished by still further lowering the drillpipe until the plunger head 25 rests upon the upper end of the expansible packer. The weight of the drill pipe compresses the packing rings, causing them to expand into engagement with the casing, it being understood that the compressive resistance of the spring 36 is suificient to withstand the weight required to'expand the packer without permitting the uncovering of the outlet openings 35.

When the expansible packer is set as heretofore described, a rod-or other suitable element is dropped through the hollow drill pipe and strikes the head of plunger 56, which in turn The drill pipe is then lowered and the spring36 compressed, until the stufiing or packing 32 in coupling l5 moves sufficiently downward to uncover the outlet openings 35 in the side walls of the hollow stem 3|. The formation fluid enters the strainer 29 and flows upwardly in said hollow stem, through the outlet openings 35, and from thence through the secondary sealing unit 38 into the drill pipe. After the fluid is thus trapped, the drill pipe is raised until the packing 32 is again moved to its normal position over the outlet openings. Although the operation of the valve is described as being subsequent to the breaking of the closure disc, it should be understood that it might be desirable in certain instances to open the valve before breaking said disc.

When the outlet openings 35 are positioned be-. low the packing 32, fluid enters the lower cylinder M. This column of liquid augments the action of the compression spring 36. in preventing the premature operation of the sliding valve, should the apparatus strike an obstruction while being lowered into the well. Furthermore, it acts as a cushion for the valve coupling I5 as it is lowered within the cylinder N, the fluid being forced from the cylinder back through the outlet openings into the hollow stem 3|.

In order to raise the apparatus it is necessary to move the plunger head 25 away from the packer .head 13 to permit the free passage of fluidthrough the expansible packer. With the com monly employed beveled valve and seat arrangement, it is difllcult to break the seal formed between the cooperating surfaces of these members. Applicant overcomes thisdimculty by the provision of an annular, yieldable, ring 16 on the packer head 13, shown clearest in Figures 3 and 4. Said ring is embedded in a dove-tailed groove 11 formed in the packer head 13, and extends thereabove to form a seat for the plunger head 25, which is provided with an annular groove 18 to accommodate the yieldable ring 16.

I claim;

1. A well testing apparatus comprising rela- 'tively movable members having fluid passages therein, valve means for rendering said passages communicative upon relative movement of sai members, a well packer supported for relative movement on one of said members and having a fluid by-pass therethrough, a plunger head supported by the same member-for movement relative to said packer, and a sealing ring between said plunger head and said packer which is adapted to be compressed therebetween for forming a fluid tight seal of the by-pass.

2. A well testing apparatus comprising a pair of telescoping members having fluid passages therein and adapted to be lowered as a unit by a hollow tubing into a fluid fllled well, the fluid passage .in one of saidmembers being continuously communicative with said well and the passage inthe other of said members being communicative with said hollow tubing, valve means between said members for rendering their fluid passages communicative upon relative movement of said members whereby to admit fluid from one fluid passage to the other, and means forming a fluid tight seal between said fluid passages when said members are in their initial relative positions, and means forming a secondary seal between said valve means and said hollow tubing, whereby to prevent the admittance of fluid to said hollow tubing upon an inadvertent opening of said valve, said secondary seal being adapted to be broken by dropping an implement through the hollow tubing.

3. A fluid sealing device adapted to be interposed between a well testing tool and a string of hollow tubing for supporting the device within a well, embodying a frangible disc, a pair of clamping members in bearing relation with the opposite sides of said disc for supporting the same and having substantially coaxial passages therethrough of different cross sectional areas whereby to render said frangible disc capable of withstanding a greater force against one of its sides than against the other of its sides.

4. A fluid sealing device adapted to be interposed between a well testing tool and a string of hollow tubing in a well, embodying a pair of clamping members having coaxial passages therethrough of difierent diameters, and a frangible disc clamped between-the adjacent ends of said members and forming a. closure between said passages, said frangible disc being adapted to be broken by dropping an element down the hollow tubing, whereby to render said openings communicative- 5. A testing apparatus for use in connection with a hollow tubing, comprising a hollow elongated member bearing a. packer, said member having a closure at its upper end and an inlet and outlet opening respectively below and above said packer, a hollow cylinder supported by the hollow tubing for movement over the upper end of said elongated member, packing means forming a fluid tight seal between said outlet opening and said hollow cylinder, but movable relative to said opening tor rendering it communicative with the interior of said cylinder, means forming a passageway between the interior of said cylinder and said hollow tubing, and closure means in said passageway which is adapted to be broken by dropping an element through the hollow tubing.

6. An apparatus of the character described comprising an elongated member bearing an expansible well packer and having a passage therein closed at its upper end with inlet openings leading thereinto below said packer and outlet openings leading therefrom above said packer, a plunger head carried by said elongated member for effecting an expansion of said packer upon being moved relative thereto, said packer having a fluid by-pass therethrough, a yieldable sealing ring interposed between the well packer and plunger head which is adapted to be compressed therebetween to form a fluid tight seal of the fluid by-pass, a hollow cylinder supported for movement over the upper end of said elongated member and having packing means for sliding engagement therewith, said packing means being normally positioned over said outlet openings to form a fluid tight seal between said outlet openings and said cylinder, but movable relative to said outlet openings with the hollow cylinder for rendering said openings communicative with said cylinder.

7. In a well testing apparatus, a pair of relatively axially movable members, said members being in telescopic relation and having fluid chambers associated therewith, one of said chambers having a fluid outlet for rendering said chamber directly and-openly communicative with the other fluid chamber upon axial movement of one of said telescopic members with respect to the other, packing means completely surrounding one of said telescoping members in sealing relation therewith and at all times forming an endless fluid tight seal completely around the other of said telescopic members, said packing means being outside of said fluid receiving chamber and normally disposed between said chamber and said fluid outlet, whereby to interrupt the path from the fluid outlet into said fluid receiving chamber at all times until the telescoping mem bers are moved relatively in a telescopic direction a suflicient distance to position said packing means out of said intermediate position for rendering said fluid outlet communicative with said fluid receiving chamber.

8. In awell testing apparatus, a pair of relatively axially movable members, said members being in telescopic relation and having fluid chambers associated therewith, one of said chambers having a fluid outlet for rendering said chamber directly and openly communicative with the other fluid chamber upon axial movement ofone of said telescopic members with respect to the other, packing means completely surrounding one of said telescoping members in sealing relation therewith and at all times forming an endless fluid tight seal completely around the other of said telescopic members, said packing means being outside of said chamber and normally disposed intermediate said chamber and vsaid outlet, whereby to interrupt the path from the fluid outlet into said fluid receiving chamber at all times until the telescoping members are moved relatively in a telescopic direction a suflicient distance to position said packing means out a direction a suflicient chamber communicative with the other fluid chamber upon axial movement of one of said telescopic members with respect to the other, packing means completely surrounding one of said telescoping members in sealing relation therewith and atall times forming an endless fluid tight seal completely around the other of said telescopic members, whereby to interrupt the path from the fluid outlet into the said fluid receiving chamber at all times until the telescoping members are moved relatively in a telescopic direction a suflicient distance to change the relative positions of the fluid outlet and the packing means sufficiently to render said fluid outlet communicative with said fluid receiving chamber, and means forming a second fluid tight seal on one side of said telescoping valve members which normally interrupts the passage of the fluid from the well, but which is adapted to be broken for permitting the passage of said fluid.

10. In a well testing apparatus, a pair of relatively axially movable members, said members being in telescopic relation and having fluid chambers associated therewith, one of said chambers having a fluid outlet for rendering said chamber communicative with the other fluid tight -seal completely'around the other of said telescopic members, whereby to interrupt the path from the fluid outlet into the said fluid receiving chamber at all times until the telescoping members are moved relatively in a telescopic distance to change the relative positions of the fluid outlet and the packing means sufilciently to render said fluid outlet communicative with said fluid receiving chamber, a packer adapted for engagement with the walls of a well and having a fluid by-pass therethrough for by-passing fluid upon moving the entire apparatus within a well, a member carried by one of said telescoping members for seating said packer, and means adapted to be compressed between sald member and said packer for closing said by-pass.

11. In a well testing apparatus, a pair of relatively axially movable members, said members being in telescopic relation and having'fluid a chambers associated therewith, one of said chambers having a fluid outletfor rendering said chamber communicative with the other fluid chamber upon axial movement of one of said telescopic members with respect to other, packing means completely surrounding one of said telescoping members in sealing relation therewith and at all times forming an endless fluid tight seal completely around the other of said telescopic members, whereby to interrupt the path from the fluid outlet into said fluid receiving chamber at all times until the telescoping members are moved relatively in a telescopic direction a sumcient distance to change the relative positions of the fluid outlet and the packing means sufficiently to render said fluid outlet com- .municative with said fluid receiving chamber, a

packer carried by one of said telescoping members and adapted for engagement with the walls of a wellfsa-id packer having a fluid passage therethrough for by-passing fluid upon moving the entire apparatus within a well, and cooperative interfltting valve means provided on said packer andon one of said telescoping members for positively preventing the passage of fluid from the zone above the packer into the zone therebelow, when said packer is seated and during the actuation of said telescoping valve members.

12. A well testing apparatus comprising an elongated member bearing a packer adapted to engage the walls of a well, said elongated member having a fluid passage hermetically closed at its upper end with an inletopening leading into said passage below said packer and a discharge outlet leading from said passage above said packer, a valve member telescoping over the elongated member and supported for axial movement with respect thereto, means forming a fluid receiving chamber connected for coaxial movement with said telescoping valve member and into which said outlet is adapted to discharge upon axial movement of said receiving chamber and valve member with respect to said elongated member, packing means completely surrounding said elongated member in sealing relation therewith and adapted at all times to form an endless fluid tight seal with said telescoping valve member completely around the same, said packing means beingv normally positioned intermediate the discharge outlet and the fluid receiving chamber, whereby to interrupt the path from the fluid outlet into said fluid receiving chamber, said telescoping valve and chamber members being capable of movement in an axial direction a sufllcient distance to change the relative positions of the fluid outlet and said packing means sufliciently to render said packing means out of its intermediate position and said discharge outlet communicative with said fluid receiving chamber.

13. A well testingapparatus comprising an elongated member bearing a packer adapted to engage the walls of a-well, said elongated member having a fluid passage therein with an inlet opening below said packer and an outlet opening above said packer, ,a member telescoping over the elongated member and supported for axial movement with respect thereto, means forming a fluid receiving chamber in association with said telescoping member into which said outlet is adapted to discharge upon axial movement of said telescoping member with respect to said elongated member, packing means completely surrounding said elongated member in sealing relation therewith and adapted at all times to form an endless fluid tight seal with said telescoping member completely around the same, whereby to interrupt the path from the fluid outlet into said fluid receiving chamber at all times until the telescoping member is moved in an. axial direction a sufficient distance to change the relative positions of the fluid outlet and said packing means sumciently to render said outlet communicative with said fluid receiving chamber, a cylinder connected with the telescoping member and surrounding a portion of said elongated member, a cooperative plunger provided on said elongated member within said cylinder, and

a spring contained in said cylinder intermediate the plunger and the telescoping member for normally retaining the telescoping member in a receded position.

14. A deep well testing apparatus comprising a pair of telescoping members having longitudinal fluid passages therein, one of said members bearing a well packer and adapted to be stationarily supported within a well, the other of said members being adapted to be supported for axial movement with respect to said first member, means forming a fluid inlet and a fluid outlet leading to and from the fluid passage provided in the elongated packer bearing member, said fluid inlet being communicative with the well and said fluid outlet being adapted to discharge into the fluid passage in the other of said telescoping members upon relative axial movement of said members and common packing means forming endless circumferential fluid tight seals with both of said telescoping members atone side of said fluid outlet, and intermediate said outlet and the fluid passage into which it is adapted to discharge, whereby to normally prevent the passage of fluid from one telescoping member to the other, said packing means being moved out of said intermediate position, and said discharge opening moved into direct open communication with the fluid passage in said movable telescoping member, upon moving said member axially with respect to said telescoping member.

15. 'A well testing apparatus comprising relatively movable members having fluid chambers therein, valve means for rendering said chambers communicative upon relative movement of said members, a well packer supported on one of said members and having a fluid passage therethrough for facilitating the movement of the entire apparatus within a well, and cooperative valve means on said packer and on one of said relatively movable members for positively preventing the passage of fluid from the zone above the packer into the zone below the packer, when said packer is seated and during the operation of said first valve means.

16. A sealing device for use in connection with well tools, comprising a pair of clamping members having fluid chambers therein, and a frangible element held in clamped relation between said clamping members, the chambers in said clamping members having different cross sectional areas immediately adjacent the opposite sides of said frangible element, whereby to render said frangible element capable of withstanding a greater force against one of its sides than against the other oi, its sides.

17. In combination with a well tool, means forming a passage for fluid, means forming a frangible obstruction'in said fluid passage, the cross section area of said passage being diiferent immediately adjacent the opposite sides of the frangible obstruction, whereby to render said obstruction capable of withstanding a greater force against one of its sides than against the other of its sides.

18. A well testing apparatus comprising an elongatedvmember bearing a packer adapted to engage the walls of a well, said elongated member having a fluid passage closed at its upper end, with an inlet leading thereinto below said packer and a discharge opening leading therefrom above said packer, a valve member telescoping over the elongated member 'and supported for axial movement with respect thereto, a fluid receiving chamber connected with said telescoping valve member for telescoping movement over said elongated member, annular packing means carried by said valve member and normally positioned to form a circumferential fluid tight seal with said elongated member discharge opening and said fluid receiving chamber for interrupting the passage of fluid into the chamber, said packing means being moved out of said intermediate position and the discharge opening moved into direct open communication with the fluid receiving chamber upon moving said valve member and said chamber axially of said elongated member.

19. A well testing apparatus comprising an elongated member bearing a packer adapted to engage the walls of a well and stationarily support the elongated member therein, said elongated member having a fluid passage closed at its upper end, with an inlet leading thereinto below said packer and a discharge opening leading therefrom above the packer, said packerhaving a fluid by-pass therethrough for facilitating the at a point intermediate saidmovement of the apparatus through a fluid fllled well, a member carried by said elongated member for seating said packer and closing said fluid bypass to render the zones on opposite sides'of said packer non-communicative when the packer is seated, a valve member telescoping over the elongated member and supported for axial movement with respect thereto, a fluid receiving chamber connected with said telescoping valve member for telescoping movement over said elongated member, annular packing means carried by said valve member and normally positioned to form a circumferential fluid tight seal with said elongated member at a point intermediate said discharge opening and said fluid receiving chamber, for interrupting the passage of fluid into the chamber, said packing being moved out of said intermediate position and the discharge opening moved into direct open-communication with said fluid receiving chamber, upon moving said valve member and said fluid receiving chamber axiallyof said elongated member.

- LANDES H. HAYWARD.