US3097695A

US3097695A - Multiple string tubing hanger

Info

Publication number: US3097695A
Application number: US545720A
Authority: US
Inventors: Rouax Robert K Le; Claude R Neilon; Jr William W Ward
Original assignee: Armco Inc
Current assignee: Armco Inc
Priority date: 1955-11-08
Filing date: 1955-11-08
Publication date: 1963-07-16
Anticipated expiration: 1980-07-16

Description

July 16, 1963 R. K. LE RouAx ETAL 3,097,595

MULTIPLE STRING TUBING HANGER 6 Sheets-Sheet 1 Filed Nov. 8, 1955 Mimi! i ,022 Wk HWK. EMT

me wi.. Zu WE H/.S 4free/wey July 16, 1963 R. K. LE RoUAx ETAL 3,097,695

MULTIPLE STRING TUBING HANGER Filed Nov. 8, 1955 6 Sheets-Sheet 2 INVENTUPS EQBEETK. LE Bou/1x kfz/fw@ HIS ATTORNEY July 16, 1963 R. K. LE RouAx ETAL 3,097,695

MULTIPLE STRING TUBING HANGER Filed Nov. 8, 1955 6 Sheets-Sheet 3 Fig. 4 F695 Rasee TK.LE /EouAx I'MM H/.s A Trek/vs y' July 16, 1963 R. K. LE RouAx ETAL 3,097,695

MULTIPLE STRING TUBING HANGER 6 Sheets-Sheet 4 Filed Nov; 8, 1955 w .x @NWA may 2 MMWR 1,@5 DWL. Ca W @www H14 A Trae/ver July 16, 1963 R. K. LE RouAx ETAL 3,097,695

MULTIPLE STRING TUBING HANGER Filed Nov. 8, 1955 6 Sheets-Sheet 5 Hoes/WK. L EEouAx July 16, 1963 R. K. LE RoUAx ETAL 3,097,695

MULTIPLE STRING TUBING HANGER 6 Sheets-Sheet 6 Filed NOV. 8, 1955 /fw/EA/ro/Ps CL 4005 A? /l/E/LO/V Wm MM mwa/mm 2055er .LEauAx 24%? f H/e Ar rogue Y United States arent 3,697,695 MULTIPLE STRING TUBING HANGER Robert K. Le Rouax, Claude R. Neilon, and William W.

Ward, Jr., Houston, Tex.; said Le Rouax assigner, by

mesne assignments, to Amico Steel Corporation, Muidletown, Ohio, a corporation of Ghio Filed Nov. 8, 1955, Ser. No. 545,720 32 Claims. (Cl. 166--7S) This invention relates generally to tubing hangers and more particularly to a tubing hanger for supporting a multiple string of tubing within a Well.

The principal object of this invention is the provismn of a tubing hanger that will independently support two or more strings of tubing side by side permitting each string of tubing to be handled independently from the other through a common blowout preventer.

Another object is the provision of a tubing hanger baving a common sealing means to seal around each tubing string passing therethrough and sealing between the tubing hanger and the tubing head. This common sealing means is independent of the weight of the tubing strings and the sealing pressure is applied externally of the tubing head but is increased by any well pressure within the casing.

Another object is the provision of a tubing hanger anchor for holding down the tubing and simultaneously sealing the same in the tubing head. This hold down seal is also employed for applying pressure for sealing the tubing passing through the hanger.

Another object is the provision of a tubing head having a guiding means for orieuting the tubing hanger Within the tubing head when lowered therein to pre-position the tubing strings relative to the tubing head. For lowering a dual tubing hanger through the blowout preventer it is necessary that it be turned to one of two positions to line up the tubing strings with the valves controlling the tubing strings which have Hxed flanges to bolt the same on the tubing head in building the Christmas tree. Otherwise a collar ilanged mounting on the valve member is necessary to orient the valve ports with their respective tubing strings. To be assured of alignment one would have to stab a tubing string through the valve passage.

Other objects and advantages appear hereinafter in the following description and claims.

The accompanying drawings show for the purpose of exemplication without limiting the invention or claims thereto, certain practical embodiments illustrating the principles of the invention wherein:

FIG. l is a view partly in section and partly in elevation of pressure packed tubing well head comprising this invention.

FIG. 2 is an enlarged sectional view of a tubing hanger as shown in FIG. 1 and having one tubing string threadably supported thereby.

FIG. 3 is a smaller shown in FIG. 2.

FIG. 4 is a sectional view of the tubing hanger taken on the line 4 4 of FIG. 3.

FIG. 5 is a sectional view taken on the line 5-5 of FIG. 3.

FIG. 6 is a sectional FIG. 4.

FIG. 7 is an enlarged sectional view of a first modified form of tubing hanger in a tubing head wherein the two tubing strings are supported from couplings.

FIG. `8 is a perspective view of the tubing head illustrated in FIG. 2.

FIG. 9 is a horizontal sectional view of a second modified form of a tubing hanger having three strings of tubing.

FIG. 10 is a view in vertical section showing a third plan view of the tubing hanger view taken on the line 6 6 of 3,097,695 Patented July 16, 1963 modified form of orienting the valve and providing a tubing head directly sealed With the gate valve housing.

FiGS. il to 16 inclusive are views in section illustrating the sequential steps of running in a dual string of tubing in a dual hanger.

FlG. 17 is an enlarged sectional vicw of a fourth modied form of tubing hanger showing independent tubing hanger and tubing hanger coupling seals energized by the gland member.

FIG. I8 is an enlarged sectional view of a lifth modilied form of tubing hanger showing independent tubing hanger and tubing hanger coupling seals both being energiaed by the gland member directly and indirectly the second being additionally energized by the Weight of the tubing string.

FIG. 19 is an enlarged sectional view of a sixth modified form of tubing hanger showing independent tubing hanger and tubing hanger coupling seals both being energized by the gland member through the hold down screws and the Weight of the tubing string.

Referring to FIG. l, the pressure packed tubing well head wherein the casing head 1 is threadably mounted on the top of the outer casing 2, the casing head 1 also carries a casing hanger 3 that supports the inner casing 4. The flanged top of the casing head is bolted and sealed with the flanged bottom of the tubing spool 5 which supports the dual tubing ihanger 6 that suspends the dual strings of

tubing

7 and 8 within the inner casing 4.

The casing head 1 is vented at 10 for controlling any pressure or ilow in the outer casing 2 although there is ordinarily no pressure or flow in this outer casing.

The tubing head 5 is vented at 11 and 12 to receive the manifold valves 13 that are connected through ilanges to the iiow lines 14. These vents communicate with the inner casing 4.

The

tubing strings

7 and 8 are connected through the seals 15 to the dual bore gate valve members 16 and 17 between which is mounted in sealed relation the T 18 having four of the seals 15. A bonnet 20 is attached to the top of the dual valve 17 by the use of seals 15 not shown. Each tubing string passage is continued by a passage through the dual valves 16 and 17 and the bonnet and are closed by the plugs 21 which are provided with gages and valves.

The T member 18 is employed as an independent takeoff for each tubing string. The

tubing strings

7 and 3 are taken off by the

passages

22 and 23 through their independent manifold gate valves 24 and their flow Ts 26. The dual bore gate valves 16 and 17 can be made suiiiciently large to carry the tubing couplings and coupling hangers if need be.

Referring to FIGS. 2 to 6 inclusive, the tubing head 5 is provided with the annular seat or abutment 30 in the form of a horizontal shoulder separating the large upper bore from the smaller lower bore. This seat or abutment 36 is deep enough in the tubing head so that any part of the tubing hanger 6 or the hanger coupling 31 is below the surface 32 of the top flange of the tubing head 5. The tubing head is provided with the hanger location or guide member 33. This may be a separate part welded in place or cut from an integral part of the head. This guide member Orients the hanger 6 so that the tubing receiving passages therethrough are spotted so that when the dual master valve is mounted thereon the bolt holes in the bottom flange of the valve member 16 will be aligned with those in the top flange of the tubing head 5. Thus if the hanger is always spotted correctly in the tubing head, then the dual valve member 16 can always be bolted to the head and provide accurate alignment for the seals 15.

The guide member 33 of FIG. 2 has four cam surfaces 34 connected by two

apices

35 and 36 at 180 apart and two dowel sockets 37 also disposed at 180 from cach other and 90 `from the apices and representing the lowcst part of the guide member 33. Each cam surface 34 as shown in FIGS. 2 and 8 is a downwardly curved surface from an apex to a dowel socket. The hanger is provided with oppositely disposed dowel members 38 which just fit into the dowel sockets 37, but when the seat or abutment 40 on the hanger rests on the mating seat Si) in the tubing head the dowel 38 is above the bottom of the socket 37 as shown in FIG. 2.

In FIG. 7 the complementary seats or abutments 30 and 40' on the tubing head and tubing hanger respectively are beveled or sloped at the same angle as the carn guiding surface 34' which is straight and not curved as shown in FIG. 2. These seats are usually horizontal but they do not have to take this form. Another difference between the structures of FIGS. 2 and 7 is that the tubing hanger 6 of FIG. 2 has the tubing string 7 threadably attached thereto and has only one coupling hanger 31 for supporting the tubing string 8; whereas in FIG. 7 both

tubing strings

7 and 8 are suspended from coupling hangers 31.

Referring again to FIG. 2, the hanger 6 is provided with a seat or recess 41 above the seat or abutment 40 which produces the chamber 42 with the upper bore of the tubing head. This recess and chamber circumscribe the tubing hanger and are connected by the interior ports or passages 5019 wth the inner annular seal seat or chamber 44 in one of the tubing receiving passages 45 of the tubing hanger which is large enough to pass tubing couplings. This tubing receiving passage has the annular seat or abutment 46 above the chamber 44 to receive the complementary annular seat or abutment 47 on the interiorly threaded tubing hanger coupling 31 which is screwed on the end and supports the string of tubing 8 from these seats. The upper end of this out at 48 to receive the Seal 15 that seals this string of tubing to the dual valve 16.

The

chambers

42 and 44 are connected by the ports or passages 50a to 50f inclusive as shown in FIG. 6. All of these ports and the

chambers

42 and 44 are filled with a sealing material 51 which may be in parts but is preferably an integrally molded resilient packing material that will flow under pressure as does rubber, natural or synthetic, or other suitable material. The chamber 42 is closed at the top by the ring 52 which is seated on the packing 51 and has an upper beveled surface S3 against which the beveled end of the hold-down Screws 54 in the top flange of the tubing head engage and hold down the hanger on the complementary seats or abutments and and at the same time compress the packing 51 and seal around the

chambers

42 and 44 to seal not only the tubing hanger 6 but also the tubing hanger coupling 31. The gland ring 52 has the annular depending section that engages the top of the packing 51 but it is shaped to close around the tops of the tubing hanger couplings in FIG. 7 but is spaced from the top of the tubing hanger in the structures of FIGS. 3, 4 and 5. The gland ring is bolted to the hanger by the bolts 55 as shown in these same igures. These bolts hold the ring in assembled relation but do not compress the packing.

The tubing hanger of FIG. 2 has one tubing receiving passage as shown at 56 with its lower and upper bores threaded to receive the tubing as illustrated at 57 and 58. Above the threaded bore 58 is the bore 49 to receive the packing 15.

In the structure of FIG. 7 both the tubing passages 45 are provided with seats 46 to receive the complementary seats 47 on the tubing hanger couplings 31 to support the tubing strings 7 and 8. There are two annular chambers 44, one surrounding each bore and filled with the packing 51. This structure is interconnected by the ports or passages a to 50d and is merely a duplicate of the right half of FIGS. 2 and 6.

If the tubing hanger is to support three strings of tubing such as indicated by the coupling hangers at 60, 61

hanger coupling 31 is bored and 62 in FIG. 9, the tubing hanger 63 will have the ports or passages 64a, b, and c to connect each chamber 44 with the chamber 42 and the interconnecting ports or passages 65a, b and c and 66 to interconnect the adjacent chambers 44 together. The gland 52 will function in the same manner to actuate the resilient packing S1 in these charnbers and ports.

The structure shown in FIG. l() illustrates how the guide member 33 can be eliminated. Here the tubing head 5 supports the tubing hanger 67 on the annular

complementary seats

30 and 40 on the head and hanger respectively. This hangcr has dual bores 45 with the seats or `abutments 46 for receiving the seats or abutments 47 on the tubing hanger couplings 68. These coupling hangers are threaded to support the tubing strings 7 and 8. However the tops of the bores 45 in the tubing hanger 67 are `bored out at 69 to receive the seals 15. Thus the seals 15 extend between the tubing hanger and the dual bore gate valve housing 16 and the bores in this housing togethcr with the valves therein are large enough to pass the tubing hanger couplings 68 and their strings of tubing. Handling pipe sections 7i) may be screwed into `these hanger couplings 68 to raise them and the string attached thereto out through the dual valve housing and bonnet. After the tubing hanger 67 has been set through a blowout prevcnter and the tubing strings sealed therein, the blowout preventer is removed which clears everything above the top flange ofthe tubing head with the top of the hanger exposed and the tubing strings sealed by the handling pipes 70. The seal rings 15 are employed to properly align the dual valve 16 with the tubing passages. The bolting flange ring 71 is turned until its holes line up with the boit holes in the tubing head flange and is then bolted in place by the studs and nuts, thus securing the members together. Here it makes no difference which Way the tubing hunger is set.

FIGS. 1l to 16 inclusive illustrate the steps of running in a dual string tubing in a hanger of the class shown in FIG. 2. This illustrated sequence begins as the last joint of the first tubing `string is being run. The hanger is made up on string as follows: the last joint ol? the tubing 7 is held in a split spider, then the coupling on the joint is removed and a tubing hanger is mounted on the tubing in place of the coupling and `a handling joint 70 is installed in the tubing hanger and the spider is then removed suspending the string from the handling tube 70.

The hanger and tubing string are lowered through preventers 72. Note hanger locator in tubing head. This automatically locates the hanger as it is lowered onto its seat as shown in FIG. 1l.

In FIG. l2 the handling joint is being removed after the tubing hanger is seated. The hold-down screws remain out.

In FIG. 13, the last joint of the second -string is being run in with the hanger coupling 31 made up on it and suspendcd from the handling joint 70. The bore of the hanger body will pass tubing couplings but the hanger coupling is seated.

In FIG. 14 the handling joint 70 is being removed. Both

tubing strings

7 and 8 are now hung and the hold down screws have been run in to energize the packing. The annulus is sealed oi' and preventers can be removed. The top of the hanger is flush with the top of the head to eliminate chance of damage while removing prevcnters as shown in FIG. 15.

In FIG. 16 the well.

Referring now to FIG. 17 the tubing head 5 supports the tubing hanger 73 with its seat 40 resting on the seat 30 in the bore of the tubing head. The bore in the tubing hanger is provided with the annular seat or abutment 74 to receive the seat or abutment 47 on the tubing hanger coupling 31. The tubing hanger 73 is provided with

independent recesses

75 and 76 to receive the independent packing rings 77 and 78 for the tubing hanger couplin'g tree is installed, ready to bring in the and the tubing hanger respectively. The gland member 80 which may have pressure applied thereto by the hold down screws 54 has two independent ange-

s

81 and 82 having the clearance space S3 therebetween. These llanges engage and exert pressure on the top of the Packing rings 77 and 78 yto enclose them and force them into sealing relation between their adjacent members.

Referring to FIG. 1S, the inner flange 81 is omitted but the packing ring 77a is enclosed by the shoulder 84 and is connected by a plurality of packing ties or passages 85 filled with the annular paclnng 86 seated on the shoulder 3i) in the tubing head. The packing 77a is thus enclosed but is energized by the vweight of the string of tubing supported by the hanger and the gland Si) with the hold down screws 5-4.

In the structure of FIG. 19 the tubing hanger coupling 31 has its seat 47 mounted on the seat S7 of the gland Sil and the

packing members

77 and 78 are independent and energized by the anges 81 and 82 of the gland 80. Thus the weight of the tubing string is effective to energize both packing

members

77 and 78 as well as the hold down screws 54.

It is to be understood that the invention disclosed herein is not limited in its application to the details of construction and arrangements of parts as illustrated in the accompanying drawings since the invention is capable of other embodiments and of being practiced or carried out in various ways.

I claim:

l. A multiple string tubing well head assembly structure comprising a well head body member having a bore and a seat from which to support pipe depending in' a well, a Christmas tree body member to be supported by said well head body member and having `a plurality of passage means lfor interconnection between said Christmas tree body member and said well head member, tubing hanger means supported from said seat on said well head body member and also having passage means for interconnection with passage means on said Christmas tree body member, and guide means comprising a laterally extending member and a cooperating slot to receive said laterally extending member between said tubing hanger means and at lleast one of said body members to cooperate in their orientation with each other and line up their interconnecting passage means.

2. A tubing hanger for supporting a multiple string of tubing in a tubing head comprising a hanger body means to t into said tubing head and having a plurality of tubing receiving openings therethrough, an abutment on said hanger body means to engage a complementary seat on the tubing head to support the hanger, lan annular exterior seal recess on said hanger body means forming a seal chamber, a second annular interior seal chamber in the wall of Aat least one of said tubing receiving openings, interconnecting passages in the hanger body means between and communicating with said seal chambers, resilient seal means in said seal chambers having connecting portions extending through said interconnecting passages, and pressure transfer means including a gland ring means engaging said resilient seal means for distorting a portion of sai-d resilient seal means and transmitting pressure through said passages and to each of said seal chambers to seal said tubing hanger.

3. The structure of claim 2 characterized in that at least one of said tubing receiving openings in said hanger body is provided with thread means to receive and hold a tubing.

4. The structure of claim 2 characterized in that each of said tubing receiving openings in said hanger body means has `a seat, coupling means with thread means to receive and hold a tubing, and an abutment means on said coupling means to mate and cooperate with the seat in said tubing receiving opening.

5. The structure of cla-im 2 which also includes a hollow tubing head to receive said hanger body means, fas- 6 tening means on said tubing head to support a head structure above said tubing head, and guide means carried by said tubing head and said hanger body means to orient and align the tubing receiving openings relative to said fastening means.

6. The structure of claim 3 characterized in that at least one other tubing receiving opening in said hanger body means has a hanger seat, coupling means with thread means to receive and hold tubing, and a mating seat on said coupling means whereby to mate and support the coupling means on said hanger seat.

7. A tubing head comprising a hollow body having a bore therethrough, an annular seat in said bore, tubing hanger means in said bore having a body with a plurality of tubing receiving openings therethrough and an exterior mating annular seat to be supported on the annular seat in said tubing bore, said hanger body having an annuiar re-cess on its exterior above said mating annular seat forming a chamber with the wall of said bore of said tubing head, each tubing receiving opening having an annular chamber therearound, passages connecting said chambers with said recess, a resilient packing in said chamber and in said recess and in said interconnecting passages, an annular gland on said resilient packing, said gland having an upper beveled surface, and anchor screws in said tubing head to engage the beveled surface of said gland to force said hanger on said seat and expand said packing in sealing relation with said recess and the wall of the bore of the tubing head `and the wail of the tubing passages therethrough.

8. The structure of claim 7 characterized by guide means on the tubing head and complementary guide means on said tubing `hanger `to orient the latter relative to the former when being seated.

9. A multiple string tubing head assembly comprising a tubing head having a bore with a hanger seat therein, Christmas tree assembly attaching means on said tubing head, tubing hanger means having a plurality of passages extending therethrough to receive at least two strings of tubing, tubing supporting means on said tubing hanger means `for supporting tubing strings in said passages, annular seal means to engage and seal ot the adjacent walls of said hanger means and said tubing head, guide means in said tubing head bore, and guide means on said tubing hanger means cooperating with said rst guide means to orient said hanger means and line up said passages in a predetermined relationship with respect to said Christmas tree assembly attaching means.

l0. The multiple string tubing head assembly of claim 9 characterized in that one of said guide means is a lateral extending member and the other of said guide means is a cooperating slot to receive said laterally extending member in orienting said hanger means relative to said tubing head.

ll. A well head structure comprising a tubing head having a bore with an annular seat therein, and having a flange with an upwardly facing surface, a tubing hanger having a body with a plurality of longitudinal tubing receiving openings therethrough, a complementary annular seat on said hanger cooperating with the annular seat in said tubing head bore to support said tubing hanger, a multiple bore control valve member having a bore in alignment with each tubing receiving opening in said tubing hanger and adapted to be seated on said upwardly facing flange surface of said tubing head, shoulder means on lsaid tubing hanger body adjacent to and cooperating with selected of said tubing receiving openings in said tubing hanger, and a coupling having an annular shoulder engaging Vand seating on said shoulder means for supporting a tubing string below said tubing hanger body, each coupling and the tubing string it supports lying below said upwardly `facing tubing head flange surface.

l2. The structure of claim 1l characterized in that the bores of said control valve member are sufficiently large to pass said couplings.

13. The structure of claim 11 characterized in that one of said passages through said tubing hanger is threaded to receive and support one string of tubing.

14. The structure of claim 13 characterized by annular seal means between said tubing hanger coupling and one bore of said valve member, and second annular seal means between said threaded passages through said tubing hanger and another bore in said valve member, said first and second seal members being independent of each other.

15. The structure of claim 11 characterized in that said tubing receiving openings through said tubing hanger each having a shoulder, `and a coupling sealed on each shoulder.

16. The structure of claim l which also includes an annular seal means between each of said tubing hanger couplings and said associated valve member bore to provide a fluid passage therebetween.

17. The structure of claim 11 characterized in that said tubing hanger having an outer annular shoulder tabove said annular seat to form with the bore of said tubing head an annular circumferential chamber, and selected of said passages having an annular recess to form with the coupling therein an annular chamber around said coupling, said tubing hanger having a connection from one chamber to the other, sealing means filling said chambers and the connection therebetween, and means to exert pressure on the sealing means of said circumferential chamber.

18. The structure of claim 11 characterized in that said tubing hanger has independent annular seal cham bers, one circumferentially of a tubing hanger and circumferentially of each tubing hanger coupling, sealing means `in each chamber, and means associated with said sealing means to apply pressure to said sealing means.

19. The structure of claim 18 characterized in that said shoulder on said tubing hanger coupling engages said last mentioned means to apply pressure to said seaiing means.

20. The structure of claim 18 characterized in that said last mentioned means is a follower ring means that applies pressure to both seal means, and the weight of said `tubing hanger applies pressure to one of said sealing means.

2l. A multiple string tubing hanger adapted for cooperation with arcuate and longitudinal shoulders in a mating tubing head, comprising a body having a plurality of tubing receiving openings therethrough, means on the body and associated with selected of said tubing receiving openings for suspending a tubing string therefrom, said body having a curved outer surface to tit the bore of said tubing head, a supporting shoulder means on said curved surface adapted to mate with the arcuate shoulder of said tubing head for supporting the body against movement longitudinally downwardly, and means on said body adapted to mate with said longitudinal shoulder of said tubing head for preventing turning movement of said body about the axis of said tubing head to maintain predetermined vertical alignment of each tubing receiving opening.

22. The tubing hanger of claim 21 characterized in that said last mentioned means on said body is a pin extending from said body for engagement With said longitudinal shoulder in said tubing head to align said body when positioned `for service.

23. The tubing hanger of claim 2l characterized in that said last mentioned means on said body is a pair of pins extending from said body for engagement with said longitudinal shoulder to `align said body when positioned for service, the longitudinal axis of said pins lying in a. common plane.

24. The tubing hanger of claim 2l characterized in Ctr that said curved outer surface on said body being completely cylindrical and said first shoulder being annular.

25. The tubing hanger of claim 2l characterized by an annular seal seat means in the top of selected of said plurality of tubing receiving openings in said body.

26. A multiple string tubing hanger comprising a body having a plurality of tubing receiving openings therethrough each having a vertically extending axis, means on the body for suspending a tubing string from each of said tubing receiving openings, said body having a curved outer surface, a downwardly facing shoulder on said curved outer surface, and laterally extending alignment means extcriorly on said body lying in a plane parallel with the axes of said tubing receiving openings and ftxedly positioning said body relative to said tubing receiving openings.

27. En combination, a well head having a hanger bowl of circular horizontal cross section therein, a onepiece hanger also of circular horizontal cross section disposed within said bowl, said hanger having an integral inwardly extending tubular neck eccentric of its upper surface and having two vertical openings therethrough, one of said openings being beneath said tubular neck and in huid flow communication therewith, connection means around the lower end of said one opening, connection means around the upper end of the interior of said tubular neck, said tubular neck providing an exterior surface of said hanger therearound spaced from the wall of said hanger bowl and spaced from the other of said openings so that a separate sealing means may be received therebetween, the other of said openings having around its sides an upwardly facing seat, a tubular coupling having a downwardly facing seat therearound seated on said other opening seat, connection means at the upper end and at the lower end of said coupling, a dual bore member surmounting said well head, said one opening and said other opening each being aligned beneath one of the bores of said dual bore member, tubular means connected between said upper connection means of said neck and the lower end of a bore of said dual bore member, and tubular means connected between said upper connection means of said coupling and the lower end ol' a bore of said dual bore member.

28. In combination, a well head having a hanger bowl of circular horizontal cross section therein, a one-piece hanger also of circular horizontal cross section disposed within said bowl, said hanger having an integra] upwardly extending tubular neck eccentric of its upper surface and having two vertical openings therethrough, one of said openings being beneath said tubular neck `and in fluid flow communication therewith, connection means around the lower end of said one opening, connection means around the upper end of the interior of said tubular neck, said tubular neck providing an exterior surface of said hanger therearound spaced from the wall of said hanger bowl and spaced from the other of said openings so that a separate sealing means may be received therebetween, the other of said openings having around its sides an upwardly facing seat, a tubular coupling having a downwardly facing seat therearound seated on said other opening seat, connection means at the upper end and at the lower end of said coupling, a dual bore member surtm-ounting said well head, said one opening and said other opening each being aligned beneath one of the bores of said dual bore member, tubular means connected between said upper connection means of said neck and the lower end of a bore of said dual bore member, tubular means connected between said upper connection means of said coupling and the lower end of a bore of said dual bore member, said tubular neck `and said tubular coupling terminating upwardly adjacent the upper end of said well head, and including means within said hanger bowl within said well head for sealing 9 between said hanger at said exterior neck surface thereof and said coupling and said well head.

29. A multiple string tubing head assembly comprising a tubing head having a bore with a hanger seat therein, Christmas tree yassembly attaching means on said tubing head, tubing hanger means having a plurality of passages extending therethrough to receive at least two strings of tubing, tubing supporting means on said tubing hanger means for supporting tubing strings in said passages, annular seal means to engage and seal orf the `adjacent walls of said hanger means and said tubing head, guide means in said tubing head bore, and guide means on said tubing hanger means, one of said guide means comprising a laterally extending member and the other of said guide means comprising a cooperating slot to receive said lateraliy extending member, said guide means cooperating with each other to orient said hanger means and line up said passages in a predetermined relationship with respect to said Christmas tree assembly attaching means.

3G. The multiple string tubing head assembly of claim 29 characterized in that said other of said guide means having said cooperative slot is also provided with cam means sloping to said slot, said laterally extending member and said cam means cooperating with each other to 10 support a sufficient portion of the weight of said tubing hanger means to rotate `the same until said laterally extending member registers with said slot.

3l. The multiple string tubing head assembly of claim 30 characterized in that said cam means is a cam surface on each sid-e of said slot which slopes toward said slot.

32. The multiple string tubing head assembly of claim 3 1 characterized in that there are a plnnality of laterally extending Amembers and cooperative slots, and the iadjacent cam surfaces of each slot meet at an apex to cooperate with the laterally extending members and rotate said tubing hanger means regardless of which position it is set into the bore of said tubing head.

References Cited in the le of this patent UNITED STATES PATENTS 2,187,839 Penick et al. Jan. 23, 1940 2,241,333 Smith May 6, 1941 2,335,355 Penick et al Nov. 30, 17943 2,417,181 Sandilands Mar. 11, 1947 2,504,025 Humason Apr. 11, 1950 2,794,505 Allen June 4, 1957

Claims

1. A MULTIPLE STRING TUBING WELL HEAD ASSEMBLY STRUCTURE COMPRISING A WELL HEAD BODY MEMBER HAVING A BORE AND A SEAT FROM WHICH TO SUPPORT PIPE DEPENDING IN A WELL, A CHRISTMAS TREE BODY MEMBER TO BE SUPPORTED BY SAID WELL HEAD BODY MEMBER AND HAVING A PLURALITY OF PASSAGE MEANS FOR INTERCONNECTION BETWEEN SAID CHRISTMAS TREE BODY MEMBER AND SAID WELL HEAD MEMBER, TUBING HANGER MEANS SUPPORTED FROM SAID SEAT ON SAID WELL HEAD BODY MEMBER AND ALSO HAVING PASSAGE MEANS FOR