US3282341A

US3282341A - Triple flow control device for flow conductors

Info

Publication number: US3282341A
Application number: US311472A
Authority: US
Inventors: James W Hodges
Original assignee: Sun Oil Co
Current assignee: Sunoco Inc
Priority date: 1963-09-25
Filing date: 1963-09-25
Publication date: 1966-11-01
Anticipated expiration: 1983-11-01

Description

J. w. HODGES 3,282,341

TRIPLE FLOW CONTROL DEVICE FOR FLOW CONDUCTORS Nov. 1, 1966 Filed Sept. 25, 1963 INVENTOR.

JAMES w. HODGES ATTORNEY United States Patent 3,282,341 TLE FLOW (IQNTROL DEVICE FOR FLOW CONDUCTORS James W. Hodges, Beaumont, Tern, assignor to Sun 011 Company, Philadelphia, Pa, a corporation of New Jerse y Filed Sept. 25, 1963, Ser. No. 311,472

17 Claims. (Cl. 166-114) This invention relates to well tools, and more particularly to a flow control device which is positionable near the lower end of a well flow conductor, such as a tubing string, for controlling the flow of fluids from three sources through the tubing string.

This invention may be thought of as an improvement over Ta-mplen Patent No. 3,079,996, dated March 5, 1963.

An object of this invention is to provide a flow control device for controlling the flow of fluids from three sources (or producing zones) into a well flow conductor.

Another object is to provide a new and improved tool for simultaneously producing we-l-l fluids from three zones of a well through a single production well flow conductor or tubing string.

Still another object is to provide a well tool for simultaneously producing well fluids from three zones of a well through a single production tubing string, the tool including means for preventing flow of the well fluids between any of the zones.

A further object is to provide a well tool for simultaneously producing well fluids from three zones of a well through a single tubing string having a flow passage with a restricted orifice for the flow of well fluids from each production zone, whereby by proper selection of the effective sizes of the orifices the production from each of the zones may be controlled to secure any desired ratio of rates of flow of the well fluids from the three production zones.

A still further object is to provide an main flow control device positionable in a well flow conductor for controlling the flow of fluids from three sources into the well flow conductor while preventing flow of fluids between any of the sources.

An additional object is to provide an auxiliary flow device, scour-able to the main flow control device, providing restricted orifices individually to control the rates of flow of fluid from each of the three sources.

a The foregoing and other objects of the invention will be better understood from the following detailed description of an exemplification thereof, reference being had to the accompanying drawing, wherein the single figure is a some-what schematic representation of .a triple flow control device (triple flow choke assembly) according to this invention. as it would be positioned when in a well.

Refer now to the drawing. A well has a casing 1 which has been cemented in place in the usual manner. The well traverses three subsurface hydrocarbon-producing formations (production zones), 3. lower formation, a middle formation, and an upper formation, which may be either oil or gas formations. The casing 1 has been perforated for production from the three zones, :as ill-ustnated by perforations 2 adjacent the upper zone, perforations 3 adjacent the middle zone, and perforations 4 adjacent the lower zone.

A tubing string 5 is positioned in the casin and the .annulus therebetween is closed oflf .at the bottom of the tubing .by means of a production packer 6, which latter prevents communication between the lower and middle zones by way of the casing-tubing annulus. Packer 6 is located between casing perforations 3 and 4. The lower end of the tubing 5 is perforated as at 7, or it may be completely open, to allow the fluid from the lower forma- 3,282,341 Patented Nov. 1, 1966 tion to flow into the tubing. The tubing carries a landing nipple assembly 8 (a side-door choke landing nipple hookup) in which the outer assembly 9 of the triple completion tool or flow control device is retrievably locked.

The landing nipple assembly 8 is located in the region of the middle and upper zones or formations. A concentric tube 10, which will be referred to in more detail hereinafter, surrounds the landing nipple assembly 8 and is secured at its upper and low ends (as by welding, for example) to the outside of tubing 5. The upper and lower ends of tube 10 are in this way sealed to the outside of tubing 5. Tube 10 carries a production packer 11, located above perforations 3, which packer seals the tubecasing annulus above these perforations and prevents communication between the middle and upper zones by way of this annulus.

An upper pack-er 12, similar to packers 6 and 11, is used above perforations 2 (and preferably above the upper end of tube 10) to seal the casing-tubing annulus above these perforations and to prevent the flow of fluid from the upper zone to the surface by w-ay of this annulus. If the well has a fourth producing formation located above packer 12, casing 1 may be perforated above this packer and fluid from this fourth formation may flow to the surface by way of the casing-tubing annulus. Suitable packers for use at -6, 11, and 1 2 are described in my Patent No. 3,022,828, dated February 27, 1962.

The outer assembly 9 of the tool is releasably anchored in the tubing string 5 by an anchoring or well tool device (not shown) which may be of the type disclosed in Miller Patent No. 2,673,614. The landing nipple 8, which is connected in the tubing string to form a part thereof, is constructed and arranged to provide for this anchoring. This releasable anchoring construction is entirely conventional, so will not be described further herein. Reference may be made to the aforementioned Tamplen patent, and also to the aforesaid Miller patent, for a complete description thereof. The outer assembly or housing 9 may be located and locked in nipple assembly 8 by means of wireline equipment.

The outer assembly or housing '9, which may be thought of as a check valve assembly, forms an annulus 13 with the landing nipple assembly 8. Said outer housing con tains lower side ports 14 for passage of fluid from the lower zone, middle side ports 15 for passage of fluid from the middle zone, and upper side ports 16 for passage of fluid from the upper zone. The landing nipple assembly 8 contains ports 17 (in the form of a ported collar, located between packers =6 and [11, in approximate vertical alignment with casing perforations 3) for receiving fluid from the middle zone. The landing nipple assembly 8 also con tains ports 18 (in the form of a ported collar, located between packers 11 and 12, in approximate alignment with housing ports 16) for receiving fluid from the upper zone.

The outer housing 9 carries a V-type or chevron-type packing means 19 which is positioned in annulus 13 above lower ports 14. Packing means 19 forces the fluid from the lower formation or zone (which enters tubing 5 via perforations 7) to flow through ports 14 into housing 9.

The lower side ports 14 define one end of a first internal flow channel which extends upwardly (in outer housing 9) from such side ports. A resilient sleeve-type check valve 20 (illustrated schematically as being in the open position, away from ports 14) is positioned in this flow channel, to prevent backflow of fluid toward the lower zone. The middle side ports 15 define one end of a sec ond internal flow channel which extends upwardly (in outer housing 9) from such side ports. A resilient sleevetype check valve 21 (illustrated schematically as being in theopen position, away from ports 15) is positioned in this second flow channel, to prevent backflow of fluid as toward the middle zone. The upper side ports 16 define one end of a third internal flow channel which extends upwardly (in outer housing 9) from such side ports. A resilient sleeve-type check valve 22 (illustrated schematically as being in the open position, away from ports 16) is positioned in this third flow channel, to prevent backflow of fluid toward the upper zone. Instead of the resilient sleeve-type check valves illustrated, metal and O-ring type check valves could be used.

The lower end of housing or check valve assembly 9 has attached thereto an equalizing disc or plug 23 which is normally in a position such as to seal the lower end of this housing. This plug is relcasably secured in a skirt (not shown), which is fastened to the lower end of housing 9 by means of a shear pin (not shown). This shear pin may be sheared to allow the plug to move to a lower position wherein fluids may flow into the bottom of housing 9. The lower end of tubing 5, below packer 6, is perforated at 7, so that fluid from the lower zone or formation can flow through casing perforations 4 and tubing perforations 7 into the interior of tubing 5, and thence can flow upwardly in the tubing and through housing ports 14 and past check valve into the interior of housing 9.

An elongated inner member 24, which may be termed an orifice head assembly, is retrievably fastened in position in the outer housing or assembly 9. The inner member 24 is run into the well separately from outer housing 9, by means of wireline equipment, and seats in the running neck of the outer housing. A suitable retrievable fastening means (for fastening inner member 24 in outer housing 9) is described in the aforementioned Tarnplen patent, to which reference is hereby made.

The inner member 24 forms an annulus 25 with the outer housing or assembly 9. The orifice head assembly 24 has a central depending extension or prong 26 the lower portion of which is solid, i.e. imperforate. Slightly below the solid portion of prong 26, and at the extreme lower end of member 24, this member carries a choke means (tungsten carbide choke bean) 27 which provides communication between the lower end of housing 9 (above check valve 20) and the lower end of a chamber 28 provided at the lower end of the solid portion of prong 26. The choke means 27 forms a termination for the first internal flow channel previously referred to, so that it in effect forms a continuation of the lower zone flow path. The production rate from the lower zone is controlled by choke 27 (through which choke or orifice the fluid flow from the lower formation passes).

An O-ring seal 29, carried by member 24 at the lower end of prong 26, seals the lower end of annulus 25 and forces all of the fluid from the lower zone to flow through choke 27. A pair of diametrically-opposite, transversely-extending ports 30 are provided at the upper end of chamber 28; these ports provide fiuid communication between chamber 28 and annulus 25, above seal 29. Housing 9 has a pair of diametrically-opposite, transversely-extending ports 31 which are approximately aligned vertically with ports 3t); ports 31 provide fluid communication between annulus 25 and the annular space just outside housing 9. Tubing 5 has a pair of diametrically-opposite, transversely-extending ports 32 which are approximately aligned vertically with ports 31; ports 32 provide fluid communication between the annular space outside housing 9 and the interior of concentric tube 11), i.e. the annulus between tubing string 5 and the surrounding tube 10.

An O-ring seal 33, carried by prong 26 above ports 30, seals oif annulus 25 and prevents lower zone fluid from flowing upwardly therein. A V-type or chevron-type packing means 34, carried by outer housing 9 above ports 31, seals off annulus 13 and prevents lower zone fluid from flowing upwardly therein.

Fluid from the lower zone, after flowing through housing ports 14 past check valve 20, flows through choke 27 into chamber 28, from whence it flows through ports 3 31, and 32 into the annulus provided by tube 10;

. it then flows upwardly in this latter annulus to the top of tube 14).

The wall of tubing 5 has therein a plurality (four in number, for example) of spaced holes 35 whose centers are located in a common horizontal plane just below the upper joint between tube 1t} and tubing 5; holes 35 provide fluid communication between the interior of tube 10 and the interior of tubing string 5. Fluid from the lower zone thus flows from tube 10' through holes 35 into tubing string 5, and upwardly through the latter to the surface.

A pair of short, diametrically-opposite, transverselyextending pipes 36 are sealed through tube 10, to provide fluid communication between the casing 1 and the landing nipple assembly 8. Pipes 36 are in vertical alignment with the ported collar 17 previously referred to, being in fact sealed into this collar, and are in approximate vertical alignment with casing perforations 3. Pipes 36, being sealed through tube 11 provide flow channels transversely through this tube which are isolated from any fluid flowing upwardly through this tube. Due to the presence of packers 6 and 11, fluid from the middle zone flows through the casing perforations 3 into the tubecasing annulus, and thence through pipes 36 into annulus 13 inside the landing nipple assembly 8. The pipes 36 may for obvious reasons he termed cross-over pipes.

The outer housing 9 carries a V-type or chevron-type packing means 37 which is positioned in annulus 13 above middle ports 15. Packing means 37 forces the fluid from the middle formation or zone (which fluid enters annulus 13 via pipes 36, from the casing) to flow through ports 15 into housing 9. This middle formation fluid flows through housing ports 15 and past check valve 21 into the interior of housing 9.

Above the solid portion of prong 26, inner member 24 has two separate internal fluid flow passages, each of which terminates in a restricted choke bean mounted at the upper end of orifice head assembly 24. Prong 26 is bored above its lower, solid portion, so that it can be considered as tubular, above such solid portion. One fluid flow passage comprises the bore 38 of prong as, the lower end of this bore communicating with the interior of outer housing 9 by means of a pair of diametricallyopposite, transversely-extending apertures 39. An O-ring seal 41), carried by prong 26 above apertures 39, seals off the annular space between prong 26 and housing 9, and prevents middle zone fluid from flowing upwardly therein. The middle zone fluid, after flowing through ports 15 past check valve 21, flows through apertures 39 into the lower end of bore 38.

The bore 38 extends upwardly through member 24 and terminates in a choke means (tungsten carbide choke bean) 41 at the upper end of this member. The bore 33 thus forms a continuation of the middle zone flow path, and the production rate from the middle zone is controlled by choke 41 (through which choke or orifice the fluid flow from the middle formation passes). The upper end of choke bean 41 communicates with the interior of tubing 5. Fluid from the middle zone, after passing through choke 41, flows upwardly through tubing string 5 to the surface.

An O-ring seal 42, carried by member 2 seals the annular space between this member and housing 9, above housing ports 16.

A pair of short, diametrically-opposite transverselyextending pipes 43 are sealed through tube 1%, to provide fluid communication between the casing 1 and the landing nipple assembly 8. Pipes 43 are in vertical alignment with the ported collar 18 previously referred to, being in fact sealed into this collar, and are in fluid communication with casing perforations 2. Pipes 43, being sealed through tube 10, provide flow channels transversely through this tube which are isolated from any fluid flowing upwardly therein. Due to the presence of packers 11 and 12, fluid from the upper zone flows through the casing perforations 2 into the tube-casing annulus, and thence through pipes 43 into the annular space between housing 9 and the landing nipple assembly 8. The pipes 43,

like pipes 36, may be termed cross-over pipes.

The outer housing 9 carries a V-type or chevron-type packing means 44 which is positioned in the annular space between this housing and nipple assembly 8, above upper ports 16. Packing means 44 forces the fluid from the upper formation or zone (which flows through pipes 43, from the casing) to flow through ports 16 into housing 9. This upper formation fluid flows through housing ports 16 and past check valve 22 into the interior of housing 9.

The other of the two fluid flow passages (in inner member 24) previously referred to comprises a bore 45 formed in housing 24. The lower end of bore 45 communicates with the interior of housing 9, and this bore extends upwardly through member 24 separately from bore 38), and terminates in a choke means (tungsten carbide choke bean) 46 at the upper end of this member.

Chokes

41 and 46 are parallel to each other, and they are both located at and mounted in the top of member 24; although not illustrated in the drawing, these chokes are two separate elements which are independently (and separately) readily removable, each from the body of member 24. Choke 27, at the bottom of member 24, is likewise independently (and separately) readily removable from the body of member 24.

It may be seen that fluid from the upper zone flows past check valve 22 into the interior of housing 9. The bore 45 forms a continuation of the upper zone flow path, and the production rate from the upper zone is controlled by choke 46 (through which choke or orifice the fluid flow from the upper formation passes). The upper end of choke bean 46 communicates with the interior of tubing 5. Fluid from the upper zone, after passing through choke 46, flows upwardly through tubing string 5 to the surface.

It may be seen, from the foregoing, that complete separation of the three formations or zones is maintained prior to the point, just above or downstream from the choke beans 41 and 46 (i.e., the point approximately vertically aligned with holes 35) at which all three streams initially commingle. Above or downstream from this point of initial commingling, commingled flow to the surface of all three streams takes place upwardly through the single tubing string 5.

It is pointed out that the cross-over pipes 36, which convey fluid from the middle zone via casing perforations 3 to the landing nipple assembly annulus 13, are mounted in the concentric tube likewise, the crossover pipes 43, which convey fluid from the upper zone via casing perforations 2 to the annulus within landing nipple assembly 8, are mounted in tube 10. Tube 10 also conveys the lower zone production around the major length of the tool (after such lower zone production has passed through its choke 27).

As previously described, the side-door choke landing nipple hookup 8 is located in the tubing string above the lower packer 6. The triple flow control device or triple fiow choke assembly or triple completion choke assembly or triple completion tool (which actually consists of two separate assemblies, as previously described, to wit, a check valve assembly and an orifice-head assembly) will be locked in the landing nipple 8. The outer assembly 9, which is run independently and locked in the landing nipple 8, contains the

check valves

20, 21, and 22, and packing

seals

19, 34, 37, and 44, which prevent undesired flow from one zone to the other.

The orifice head assembly 24, which carries the tungsten carbide choke

beans

27, 41, and 46, is run separately, and is seated and locked in the outer assembly 9'.

With the triple completion or triple flow choke assembly above described, it is relatively easy to make a separate test of one formation or zone, by blanking off production from the other two with blank or plugged choke beans. In order to change chokes to make such tests, or to change production chokes should this become necessary, all that is required is to remove the orifice head assembly 24 from the check valve assembly (outer housing) 9 and bring the former to the surface, with conventional wireline tools. This is a very simple wireline operation, a routine operation in the hands of an experienced wireline operator. It is pointed out that removal of the orifice head assembly 24 does not result in inter-zone flow, since the check valve assembly 9 remains in the well; separation between the Zones is then maintained by means of

check valves

20, 21, and 22, and

packers

37, 34, 19, 11, and 6.

It is pointed out that all three of the

chokes

27, 41, and 46 are in the same single assembly (to wit, member 24). It is often desirable to change the chokes controlling all three of the zones, and to do so at the same time. Utilizing the tool construction previously described, this can be accomplished in one operation, upon pulling the member 24 from the well. The running (or pulling) and locking of the two assemblies comprising the triple flow choke assembly involves exactly the same procedure as that described in detail in the aforementioned Tamplen patent, so the description will not be repeated here.

The invention claimed is:

1. A flow control device, for well tubing having first and second lateral ports communicating with the interior of said tubing, including: an elongated housing positioned in said tubing and provided with an internal flow passage for communication at its upper end with the interior of said tubing, provided with a first side port intermediate the ends of the housing for communication with the exterior of the housing and said internal flow passage and with said first lateral port, provided with a second side port intermediate the ends of the housing for communication with the exterior of the housing and said internal flow passage and with said second lateral port, and provided with a third side port adjacent the lower end of the housing for communication with the exterior of the housing and said internal flow passage and with the lower open end of said tubing; an inner member releasably' securable to the upper end of said housing, said inner member having means extending into said internal flow passage providing with said internal flow passage, when the inner member is secured to the housing, .a first flow passage communicating with said first side port and opening upwardly into the tubing above said first lateral port, providing a second flow passage communicating with said second side port and opening upwardly into the tubing, and providing a third flow passage communicating with said third side port; seal means on said housing for sealing between the tubing and the housing intermediate said lateral ports; seal means on said housing for sealing between the tubing and the housing below said second lateral port; and means carried by said housing permitting flow in one direction only into said internal flow passage through said first lateral port and said first side port.

2. A device as set forth in claim 1, including also means in each of said first and second flow passages providing restricted orifices of predetermined relative sizes.

3. A device as set forth in claim 1, including also means in each of said first, second, and third flow passages providing restricted orifices of predetermined relative sizes.

4. A flow control device, for well tubing having first and second lateral ports communicating with the interior of said tubing, including: an elongated housing positioned in said tubing and provided with an internal flow passage for communication at its upper end with the interior of said tubing, provided with a first side port intermediate the 'ends of the housing for communication with the exterior of the housing and said internal flow passage and with said first lateral port, provided with a second side port intermediate the ends of the housing for communication with the exterior of the housing and said internal flow passage and with said second lateral port, and provided with a third side port adjacent the lower end of the housing for communication with the exterior of the housing and said internal flow passage and With the lower open end of said tubing; seal means on said housing for sealing between the tubing and the housing intermediate said lateral ports; seal means on said housing for sealing between the tubing and the housing below said second lateral port; and means providing a longitudinal flow passage communicating at one end with said third side port and said internal flow passage and opening upwardly into the tubing above said first lateral port.

5. A device as defined in claim 4, wherein the lastmentioned means is carried by said tubing.

6. A device as defined in claim- 4, wherein the lastmentioned means comprises a concentric tube surrounding said tubing and sealed at its upper and lower ends to said tubing.

7. A device as defined in claim 4, wherein the lastmentioned means comprises a concentric tube surrounding said tubing and sealed at its upper and lower ends to said tubing, and wherein said first and second lateral ports are coupled to pipes which extend transversely across the annulus provided by said concentric tube.

8. A device in accordance with claim 4, including also means carried by said housing permitting flow in one direction only into said internal flow passage through said first lateral. port and said first side port.

9. A device in accordance with claim 4, including also means carried by said housing permitting flow in one direction only into said internal flow passage through said first lateral port and said first side port, and means carried by said housing permitting flow in one direction only into said internal flow passage through said second lateral port and said second side port.

it). A device in accordance with claim 9, including also means carried by said housing permitting flow in one direction only into said internal flow passage through the lower end of said tubing and said third side port.

11. A device as defined in claim 7, including also an inner member releasabiy sec-urable to the upper end of said housing, said inner member having means extending into said internal flow passage providing with said internal flow passage, When the inner member is secured to the housing, a first flow passage communicating with said first side port and opening upwardly into the tubing above said first lateral port, providing a second flow passage communicating with said second side port and opening upwardly into the tubing, and providing a third flow passage communicating with said third side port and with said one end of said longitudinal flow passage.

12. A device as set forth in claim 11, including also means in each of said first and second tfloW pass-ages providing restricted orifices of predetermined relative sizes.

13. A device as set'forth in claim 11, including also means in each of said first, second, and third flow passages providing restricted orifices of predetermined relative sizes.

14-. A device as set forth in claim 11, including also means in each of said first and second flow passages providing restricted orifices of predetermined relative sizes, and means carried by said housing permitting fiow in one direction only into said intern-a1 flow passage through said first lateral port and said first side port.

15. A device as set forth in claim 11, including also means in each of said first, second, and third flow passages providing restricted orifices of predetermined relative sizes, and means carried by said housing permitting flow in one direction only into said internal fiow passage through said first lateral port and said first side port.

16. A device as set forth in claim 11, including also means in each of said first and second flow passages providing restricted orifices of predetermined relative sizes, means carried by said housing permitting flow in one direction only into said internal flow passage through said first iateral port and said first side .po-rt, means carried by said housing permitting flow in one direction only into said internal flow passage through said second lateral port and said second side port, and means carried by said housing permitting flow in one direction only into said internal flow passage through the lower end of said tubing and said third side .port.

17. A device as set forth in claim 11, including also means in each of said first, second, and third flow passages providing restricted orifices of predetermined relative sizes, means carried by said housing permitting flow in one direction only into said internal flow passage through said first lateral port and said first side port, means carried by said housing permitting flow in one direction only into said internal flow passage through said second iat-eral port and said second side port, and means carried by said housing permitting flow in one direction only into said internal flow passage through the lower end of said tubing and said third side port.

References Cited by the Examiner UNITED STATES PATENTS 2,665,759 1/1954 Ch-i-lders 1661l4 X 2,839,144 6/1958 Ault 166l48 2,870,843 1/1959 Rodgers 1661l5 3,022,828 2/1962 Hodges 16645 X 3,079,996 3/1963 Tamplen 166l15 FOREIGN PATENTS 851,096 10/1960 Great Britain.

CHARLES E. OCONNELL, Primary Examiner. D. H. BROWN, Assistant Examiner.

Claims

1. A FLOW CONTROL DEVICE, FOR WELL TUBING HAVING FIRST AND SECOND LATERAL PORTS COMMUNICATING WITH THE INTERIOR OF SAID TUBING, INCLUDING: AN ELONGATED HOUSING POSITIONED IN SAID TUBING AND PROVIDED WITH AN INTERNAL FLOW PASSAGE FOR COMMUNICATION AT ITS UPPER END WITH THE INTERIOR OF SAID TUBING, PROVIDED WITH A FIRST SIDE PORT INTERMEDIATE THE ENDS OF THE HOUSING FOR COMMUNICATION WITH THE EXTERIOR OF THE HOUSING AND SAID INTERNAL FLOW PASSAGE AND WITH SAID FIRST LATERAL PORT, PROVIDED WITH A SECOND SIDE PORT INTERMEDIATE THE ENDS OF THE HOUSING FOR COMMUNICATION WITH THE EXTERIOR OF THE HOUSING AND SAID INTERNAL FLOW PASSAGE AND WITH SAID SECOND LATERAL PORT, AND PROVIDED WITH A THIRD SIDE PORT ADJACENT THE LOWER END OF THE HOUSING FOR COMMUNICATION WITH THE EXTERIOR OF THE HOUSING AND SAID INTERNAL FLOW PASSAGE AND WITH THE LOWER OPEN END OF SAID TUBING; AND INNER MEMBER RELEASABLY SECURABLE TO THE UPPER END OF SAID HOUSING, SAID INNER MEMBER HAVING MEANS EXTENDING INTO SAID INTERNAL FLOW PASSAGE PROVIDING WITH SAID INTERNAL FLOW PASSAGE, WHEN THE INNER MEMBER IS SECURED TO THE HOUSING, A FIRST FLOW PASSAGE COMMUNICATING WITH SAID FIRST SIDE PORT AND OPENING UPWARDLY INTO THE TUBING ABOVE SAID FIRST LATERAL PORT, PROVIDING A SECOND FLOW PASSAGE COMMUNICATING WITH SAID SECOND SIDE PORT AND OPENING UPWARDLY INTO THE TUBING, AND PROVIDING A THIRD FLOW PASSAGE COMMUNICATING WITH SAID THIRD SIDE PORT; SEAL MEANS ON SAID HOUSING FOR SEALING BETWEEN THE TUBING AND THE HOUSING INTERMEDIATE SAID LATERAL PORTS; SEAL MEANS ON SAID HOUSING FOR SEALING BETWEEN THE TUBING AND THE HOUSING BELOW SAID SECOND LATERAL PORT; AND MEANS CARRIED BY SAID HOUSING PERMITTING FLOW IN ONE DIRECTION ONLY INTO SAID INTERNAL FLOW PASSAGE THROUGH SAID FIRST LATERAL PORT AND SAID FIRST SIDE PORT.