US2906342A - Well assembly for production of fluids from a plurality of zones - Google Patents

Description

Sept. 29, 1959 B. N. RussELL ETAL A2,906,342

WELL ASSEMBLY FOR PRODUCTION OF FLUIDS -FRoM A PLURALITY oF zoNEs Sheets-Sheet l Filed March 21, 1956 Muff 2 Sheets-Sheet 2 mi $1??;545474411551252515125,151,545 .l....

1959 B. N. RUSSELL z-:TAL

WELL ASSEMBLY FOR PRODUCTION OF FLUIDS FROM A PLURALITY OF ZONES Sept.

Filed March 21, 1956 INVNToRs. Bil/y lV. Russe/l, BY Roy E. Anderson,

Patented Sept. 29, 1959r United States Patent Oilice WELLASSEMBLY FOR` PRODUCTION OF FLUIDS FROM A PLURALITY OF ZONES Application March 21, 1956, serial No. 572,963

20 Claims. (Cl. 16s- 115) The present invention is directed-to apparatus adapted for use in a well penetrating a plurality of productive zones. More particularly, the invention is directed to apparatus for completing a well in a plurality of zones. In its more specic aspects, the invention has to do with a well assembly for production of uids from spaced apart zones in a well bore.

The present invention may be brieily described as embodying apparatus adapted for use in a well penetrating a plurality of productive oil and/ or gas zones, strata, horizons, formations, sands, and the like. The apparatus comprises a retrievable elongated tubular member provided with means on its upper end for suspending the tubular member at a selected point in a well pipe. An inner sleeve is telescopically arranged within the lower end of the tubular member and the outer peripheral surface of the sleeve extending within the tubular member and being provided with serrations. Removable holding means in the tubular member normally holds the inner sleeve in a telescopic position. Spring biased means in the tubular member are arranged for engaging the serrations for locking the'telescopic sleeve in an extended position on release of the holding means.

The holding means may be a frangible shear pin, a"

ductile pin, which will stretch or deform, or a rupturable plate.

The upper end of the tubular member and the lower end of the telescopic sleeve are provided with externally arranged sealing means for sealing the tubular member and the telescopic sleeve in thewell on arrangement of the apparatus therein. The lower end of the telescopic sleeve, 'in one embodiment, is suitably provided with a separately retrievable tubular member releasably attached to the lower end. of the telescopic sleeve. The sealing means may be arranged on the outer surface of the retrievable tubular member andA means are also provided on the outer surface of the separately retrievable tubular member for locating and positioning'the sleeve in an eX- tended position in the well below the selected point.

The locating and positioning means may suitably cornprise spring biased keys arranged onthe outer surface of the separately retrievable tubular member.

The separately retrievable tubular member is releasably attached to the telescopic sleeve by frangible means, such as shearpins and the like. The lower end of the sleeve or the separately retrievable tubular member releasably attached to the sleeve may have a removable or releasable plug arranged therein which is removable or releasable from .the sleeve on positioning of the sleeve in the well. l

The device of the present invention is adapted to -be used with spaced apart first and second packers which isolate rst and second productive zones or horizons in a'well bore. The tubular member is seatable in a tubing in a well casing at a selected point above the rst zone and adjacent the first packer. the separately retrievable tubular member releasably The telescopic sleeve ory attached to the telescopic sleeve is adapted to be sealed in the second packer and located and positioned therein.

The present invention also comprises a well assembly for separate production of fluids from separate zones in: which spaced apart rst and second packers isolating iirst and second Zones in a well casing in the well are provided. The first zone is in iluid communication with the Space between the packers and the second zone is in liuid communication with the casing below the second packer. The tubular member of the present invention comprising the telescopically arranged sleeve is suspended and sealed in a first tubing in the casing at a selected point above the first zone and adjacent the rst packer. The telescopic sleeve is sealingly arranged and positioned in the second packer such that production from the second zone is through the telescopic sleeve and the tubular member into the rst tubing while production from the VArst Zone is through a second tubing communicating with the space between the packers.

The present invention is quite advantageous and useful inpermanent well completion operations. Theinvention is also useful in that it is now possible to position tubular members in the tubing to allow production from.

both packers with a minimum amount of operating time and with positive sealing operations.

The present invention will be `further illustrated by ref-r erence to the drawing in which:

Fig. 1 is an elevational view in partial section of one embodiment of the apparatus of the present invention with the telescopic sleeve in telescoped position;

Figs. 2 to 4, inclusive, are stepwise illustrations of the running in of the tubular member for positioning in a dually completed well;

Fig. 5 illustrates the removal of the tubular member from a dually completed well;

Fig. 6 is a' partial sectional view of the lower end of anotherembodiment of the present invention;

Fig. 7 is an elevational view of the device of Fig. 6 arranged in a well casing;

Fig. 8 is a modification of the embodiment of Figs. 6 and 7; and Fig. 9 is another embodiment of the embodiment of Figs. 6 and 7.

Referring now Vto the drawings and particularly to' Fig. 1,`numeral 11 designates an elongated tubular mem` v ber provided witha supporting or suspending means;

12 its upper end which suitably may be a supporting or suspending means, such as illustrated at page l4063 of the Composite Catalog of Oil Field'A and Pipelinel which are designed to provide a seal between the tubular member 11 and the inner wall of the tubing string. Y Threadedly connected to the upper section 15 of the tubular member-11 by mating threads 16 is a lower sec- :ytion :17 ofV the tubular member 11 provided a' chamber 18. Arranged within vThe outer peripheral surface of the telescopic sleeveYY 19 `is provided ,with serrationsv 22 which engage :with

locking means, suchasl slips 23, and are heldin-coneV tact' therewith byj means of aI garter. spring 24. The'v slips 23" are arranged between inwardly Y prcjectin w.

shoulders 25 and 26 in the chamber 18. Y

the chamberlSris a telescopic sleeve' 19 having an annular shoulder or piston 20 on its The lower section 17 of the tubular member 11 is v connected to the telescopic sleeve 19 by frangible means, such as shear pins 27, which on rupture releases the sleeve 19 from the section 17 for slidable movement within the chamber 18.

- The lower portion 28 of the sleeve 19 which is of greater diameter than the serrations 22 is threadedly connected by mating threads 30 to a sleeve member 31. The sleeve member 31 is connected by frangible means or shear pins 32 to a second tubular member 33 which is separately retrievable by means of a retrieving head or fishing neck 33a. A sealing means or O- ring 43 provides a seal between the tubular member 33 and the sleeve 31.

Carried on the outer surface of the tubular member 33 are sealing means 34 and 35. Also arranged on the outer surface of the tubular member 33 are a plurality of locator keys 36 which are biased outwardly by means of springs 37, the locator keys 36 being pivotally attached to the member 33 by pivot pins 38 in recesses 39.

It will be noted that the tubular member 11 made up of sections 15, 17 and the telescopic sleeve 19 and sleeve 31 and second tubular member 33 are provided with a passageway generally indicated by the numeral 40 which extends through the tubular member 11. The lower end of this passageway 40 may be closed by a plug member 41 releasably held therein by frangible means, such as shear pin 42.

Referring now to Figs. 2 to 5, a well bore, such as 50, drilled from the earths surface to penetrate a plurality of spaced apart hydrocarbon productive zones 51 and 52, has a casing 53 arranged therein and cemented in place with primary cement 54.

Perforations 55 have been made in the casing 53, cement 54 and formation 51 by means of a gun perforator and perforations 56 have been made in the casing 53, cement 54 and formation 52 also by means of a gun perforator. Arranged in the casing 53 is a first tubing string 57 which extends to the surface of the earth and a second tubing string 58 also extending to the surface of the earth. The tubing string 57 is provided with a landing nipple or supporting or anchoring means 59, which is provided with a side port 57a and is described in the Composite Catalog supra at page 4048, while the tubing S connects into a passageway 60 in a packer 61 arranged on the lower end of the tubing 57.

Port 57a, upon removal of the retrievable production tube assembly, permits circulation between the tubing strings and the casing-tubing annulus. With the production tube assembly in place, the port 57a in the side port nipple is sealed off by packing elements 13 and 14.

Prior to placement of the tubing string 57 and the packer 61, a packer 62 is arranged in the well casing 53, the packer 62 being provided with an elongated locator landing nipple 63 which is similar to landing nipple 59.

In Fig. 2 the tubular extension member 11 is lowered in the tubing 57 by means of a wire line 64 connecting to a grappling tool 65 and to fishing neck 10 to position the tubular member 11 with its hanger assembly 12 in the landing nipple 59 as shown more clearly in Fig. 3. It is to be noted in Fig. 3 that the sealing means 13 and 14 are sealingly engaged with the inner wall of the tubing 57 but the sealing means 34 and 35 are not in engagement.

Thereafter, as shown in Fig. 4, the separately retrievable member 33, sleeve 31, and telescopic member 19 are extended by exerting fluid pressure lthrough the passageway 40 on the annular shoulder- 20 which causes the shear pin 27 to be fractured which allows the sleeve 19 to be forced downwardlyby pressure eX- erted thereon in passageway 40. This causes the separately retrievable member 33 on which sealing means 34 and 35 are arranged and locator key 36 to be positioned in the locator landing nipple 63, as shown in Fig. 4. After the sleeve 19 and the tubular member 33 have been positioned in the locator landing nipple 63 and packer 62, additional uid pressure s exerted through the passageway 40 on plug 41 which causes the shear pins 42 to be sheared and allows the plug 41 to be blown from the passageway 40.

With the seating of the tubular member 33 in the locator landing nipple 63, production may then be had from the formation or sand 51 through perforations 55 into the space S between the packers 61 and 62 and up through passageway 60 in packer 61 into tubing 58 and thence to the earths surface. Production from formation or sand 52 may be had through perforations 56, up through passageway 40 in tubular member 11, into tubing string 57, and thence to the earths surface.

After the tubular member 11 has been used for production from the sands or formations 51 and 52 and it is desired to pull the tubular member 11 from the casing 53, this may suitably be done as shown in Fig. 5 by attaching the wire line 64 Vby means of grappling tool 65 to the fishing. head 10 and taking an upward pull on the tubular member 11. This causes the section 17 to be pulled farther out of the sleeve 19 and allows unseating of the packing members 13 and 14 while the sealing members 34 and 35 remain seated in the locator landing nipple 63.

' Thereafter on further upward pull, the tubular member 33 carrying the sealing means 34 and 35 is removed from the locator landing nipple 63 and the complete assembly removed through the tubing 57.

Should the separately retrievable member 33 become stuck, the separately retrievable tubular member acts as a safety joint and a continued upward pull will cause the shear pin 32 to be sheared allowing the tubular member 11 comprised of the sections 15, 17, the telescopic member 19, and sleeve 31 to be pulled from the tubing, leaving the separately retrievable member 33 in the locator landing nipple 32 for separate retrieving by connecting a wire line fishing tool to the fishing head 33a.

After the device of Figs. l to 5 has been employed and it is desired to recomplete the Well, such as by cementing either formation 51 or 52 or both and reperforating therein, or perforating in another of a plurality of vertically spaced apart hydrocarbon productive zones, the perforations 55 and 56 may be sealed by depositing a low water loss fluid cement of the modified type, such as described in the patent to Salathiel U.S. 2,582,459. This low water loss cement slurry may suitablyl be an oil emulsion cement or other 'cement having low filtration characteristics which will form plugs or nodules in the perforations 55 and 56. i

To practice this step a tubular extension member, such as 7 0, shown more clearly in Figs. 6 and 7, provided with a hanger assembly 12 and a fishing neck 10 and provided with a packing means 71, is suitably run into the well casing 53 through the tubing 57. The tubular member 70 may suitably comprise a tail pipe section 72 having a depending sleeve 73 which is provided on its outer peripheral surface with serrations 74. The sleeve 73, as shown more clearly in Fig. 6, is enclosed by an outer sleeve 75 which is held on the sleeve 73 by means of a shear pin or other frangible or releasable means 76 which connects the sleeve 73 with the sleeve 75. Sealing members, such as O-rings 77, are arranged in recesses and provide a seal between a shoulder 78 on the lower end of sleeve 73 and the inner surface of the sleeve 75.

The shear pin 76 may be of a ductile metal which willdeform and suitably may be constructed of a metal such as aluminum or an alloy of aluminum, the shear pin 76 being connected to wire line 64 which extends through a passageway 79 in the tubular extension member 73.

Shear pin 76should be made of aluminum or similar ductile material which would have a tendency to bend in the middle, when force is applied at that point, allowing the ends of the shear pin to pull out of the shear pin recess rather than permit shearing ofthe pin. The top of the shear pin recess in sleeve 73 may be slightly beveled or rounded which would aid bending of the shear pin allowing the ends of the shear pin to be pulled from the recess.

The wire line 64 in this embodiment of the present invention may have a grappling tool 65 arranged thereon for engagement with the fishing neck 10. The wire line 614 in this embodiment may be provided with a weight member 80 to maintain the Wire line 64 in a taut position.

As shown more clearly in Fig. 7, the tubular extension member 70 may be comprised of the sleeve section 75, the depending sleeve 73 and the tail pipe member 72.

It may be desirable to provide aplurality of telescopic sections and, this embodiment, a second depending sleeve 81. which is similar to sleeve 73, is connected to the sleeve' member 7 5. This depending sleeve member 81 is also provided with serrations for engagement with slip segments, such as 33, shown more clearly in Fig. 6 which are biased into engagement with the serrations 74 by means of a garter spring, such as S4, the slip segments 83 being arranged between shoulders 85 and S6 in the' sleeve 75. Similar slip segments are arranged within a telescopic housing or sleeve section 87 to allow the tubular extension member 70 to be extended to its fullest extent.

After the device of Figs. 6 and 7 has been extended by upward pull on the wire line 64 to pull the ductile shear pins 76, the sleeves 75 and S7 will extend the tubular extension member to its expanded position with the slip segments 83 locking in the serration 73 and preventing the collapse of the telescopic housings 75 and 87. In other words, the locking device or serrations and spring biased slip segments maintain the tubular extension member 70 in its expanded position. Thereafter cement may be deposited, for example, in the perforations 55 or 56 as may be desired, the maximum outer diameter of the tubular extension member 7 0 being selected such that it may be lowered through the tubing 57 and through the locator landing nipple 63 as may be desired.

While cement may be owed downwardly through the passageway 79 to seal the perforations 55 and 56, it is possible to conduct other operations, such as acidizing, stimulation with oil containing suitable agents, or to inject other uids into the perforated formation, such as fracturing uids, which may include acid gels, crude petroleum and the like, which may contain a propping agent, such as sand, to increase the permeability of the formation, such as 51 or 52, by imposing a suicient pressure on the formations to cause cracks or fractures to be formed therein. It is also possible to employ the tubular extension member 70 as a production tube, if desired, but it would be more useful as a tool for treating formations below the lower open end of the tubing, such as 57, located with the lower open end below a plurality of hydrocarbon productive zones.

Fig. 8 illustrates a modification of Figs. 6 and 7 in which the shear pin 76 has been replaced by a rupture disc, such as 90, composed of a frangible metal such as magnesium or aluminum alloy. When it is desired to release the housing or sleeve 75, pressure may be exerted on the rupture disc 90 through the passageway 79 either from the earths surface or from the formation to cause the rupturing of the disc 90 and the release of the sleeves 75 or 81.

In Fig. 8 the rupture disc 90 is illustrated as an optional replacement for the ductile shear pins 76. Instead of this arrangement for releasing the telescoping joints utilizing a rupture disc the disc may be located below the bottom Vlocking telescoping joint and use conventional shear pins to suspend the telescoping housing as shown in Fig. 9, of which a major portion is similar to that shown in Fig. 1. Referring now to Fig. 9, after seating the hanger assembly inthe landing nipple, such as illustrated in Fig. 7, surface pump pressure on the casing would create an upward force on the rupture disc' 90 .which would tend to collapse the telescoping joint 19.

When this upward force reached a predetermined point the shear pins 27 would shear, then an increase in upward force (casing pressure) to a known point would rupture the frangible disc 9G. -After shearingV the pins 27 and rupturing the disc 90, the telescoping joints would be unlocked and ready for use. The metal for thefrangible rupture disc 90 could be either magnesium or an aluminum alloy.

It will be seen from the' foregoing description that a new and improved apparatus has been provided wherein production may be had from a plurality of hydrocarbon productive zones with the assembly positively located at the desired point.

For example, in the embodiments of Figs. 1 to 5, inclusive, the packers 61 and 62 may be spaced apart a distance from about 30 to about 35 feet but this distance will depend, of course, on the distance between the hydrocarbon productive zones which are to be produced simultaneously. l

The telescopic joint or sleeve, such as joint 19, may have a length from 'about 3 to about 5 feet which will allow 2 to 4 feet of movement of the sealing means 13 and 14 before the lower seals 34 and 35 are unseated. Of'course, other dimensions may be employed but these dimensions may be found satisfactory.

In practicing the present invention with the device of Figs. l to 5, inclusive, the shear pin 27 will be of least strength` and will shear rst and the shear pin 42 will be next greatest in strength and will shear second while the shear pin 32 will be of greatest strength and will shear last, the strength of the shear pins being selected for this order of rupturing or shearing.

The provision of a device of the nature illustrated more particularly in Figs. l to 5 has eliminated diiculties in that the sealing assemblies 34 and 35 carried on the tubular member 33 no longer have the tendency to be pumped down through the packer such as 62.

Furthermore, the device of Figs. 6 to 9 is quite advantageous in that the telescopic joints. are locked open after 'extending and do not tend to close while reversing out excess cement slurry when employed in cementing operations. Furthermore, the device of Figs. 6 to 9 is useful in sand washing and squeeze cementing operations. Not infrequently, sand may accumulate in the casing and it is necessary to remove this sand before other operations may be conducted. By providing a device such as in Figs. 6 to 9, operating time may be saved by employing such a device.

The nature and objects of the present invention havingy been completely described and illustrated, what We wish to claim as new and useful and to secure by Letters Patent is:

1. Apparatus adapted for use in a well which comprises a retrievable elongated tubular member provided with means on its upper end for suspending said elongated tubular member at a selected point in a well pipe, a telescopic tubular member carried by the elongated tubular member on its lower end, one of said tubular members being arranged in embraceable relationship with the other of said tubular members, coengageable means on each of said tubular members for maintaining said tubular members together when in an extended position, the embraced outer peripheral surface of the embraced of said tubular members being provided with serrations, holding means in said elongated tubular member Vengaging -with Vsaid telescopic tubular member and initially'holding said telescopic tubular member in a telescoped position, and spring biased means carried by said elongated tubular member engageable with vSaid serrations for locking said telescopic tubular V member against telescoping movement on release ofv said holdingmeans, said holding means being released by exerting ypressure against said telescopic tubular member.

2. Apparatus in accordance with claim 1 in which the upper end of said elongated tubular member is provided with means for sealing said elongated tubular member in said well pipe.

Y 3. Apparatus in accordance with claim 1 in which the holding means is a frangible shear pin.

4. Apparatus in accordance with claim 1 in which the holding means is a ductile pin.

5. Apparatus in accordance with claim l in which the holding means is a rupturable plate.

6. Apparatus in accordance with claim l in which the upper end of the tubular member and the lower end of the telescopic tubular member are provided with externally arranged sealing means for sealing the tubular member and the telescopic tubular member in said well on arrangement of the apparatus therein.

7. Apparatus in accordance with claim 1 in which the lower end of said telescopic tubular member is provided with a separately retrievable tubular member releasably attached to the lower end of the telescopic tubular member, said separately retrievable tubular member having sealing means arrangedl on its outer surface adapted to seal with the inner wall of a conduit in said well below said selected point and separate means also arranged on the outer surface of said separately retrievable tubular member for locating and stationarily positioning said separately retrievable tubular member in said conduit whereby the telescopic tubular member is maintained in its extended position.

8. Apparatus in accordance with claim 7 in which the locating and positioning means comprise spring biased keys.

9. Apparatus in accordance with claim 7 in which the separately retrievable tubular member is releasably attached to the telescopic tubular member by frangible means.

l0. Apparatus in accordance with claim 7 in which the separately retrievable tubular member has a releasable plug arranged therein.

11. Apparatus adapted for use in a well having a well pipe arranged therein and provided with spaced apart iirst and second packers isolating irst and second productive zones in said well, said rst packer being arranged on said well pipe adjacent the lower end of said well pipe and said second packer being spaced from the tirst packer in saidV well below the wellpipe, which apparatus comprises a retrievable elongated tubular member provided with means on its upper end for suspending said elongated tubular member at a selected point in said well pipe, a telescopic tubular member carried by the elongated tubular member on its lower end, one of said tubular members being arranged in embraceable relationship with the other of said tubular members, coengageable means on each of said tubular members for maintaining said tubularmembersl together when in an extended position, the embraced outer peripheral surface of the embraced of said tubular members being provided with serrations, holding means in said elongated tubular member engaging with said telescopic tubular member and initially holding said telescopic tubular member in a telescoped position, and spring biased means carried by said elongated tubular member engageable with said serrations for locking said telescopic tubular member against telescoping movement on release of said holding means, said holding means being released by exerting pressure against said telescopic tubular member, sealing means on the upper end of said elongated tubular member for sealing said elongated tubular member in said well pipe, a separately retrievable tubular member releasably attached at its upper end to the lower end of the telescopic tubular member, said separately retrievable tubular member having sealing'lmeans arranged on its outer surface for sealing? the separately retrievable tubular member inthe second packer, and separate means also arranged on the outer surface of said separately retrievable tubular member for locating and stationai'ily positioning said separately retrievable tubular member in said second packer whereby the telescopic tubular member is maintained in extended position.

12j. Apparatus adapted for use in a well having a well pipe arranged therein and provided with spaced apart rst and second packers isolating rst and second productive zones in said well, said first packer being arranged on said well pipe adjacent the lower end of said well pipe and said second packer being spaced from the first packer in said well below the well pipe, which apparatus comprises a retrievable elongated tubular member provided with means on its upper end for suspending said elongated tubular member at a selected point in said well pipe, a telescopic tubular member carried by the elongated tubular member on its lower end, one of said tubular members being arranged in embraceable relationship with the other of said tubular members, coengageable means on each of said tubular members for maintaining said tubular members together when in an extended position, the embraced outer peripheral surface of the embraced of said tubular members being provided with serrations, holding means in said elongated tubular member engaging with said telescopic tubular member and initially holding said telescopic tubular member in a telescoped position, and spring biased means carried by said elongated tubular member engageable with said serrations for locking said telescopic tubular member against telescoping movement on release of said holding means, said holding means being released by exerting pressure against said telescopic tubular member, sealing means on the upper end of said elongated tubular member for sealing said elongated tubular member in said well pipe, sealing means arranged on the outer surface of the telescopic tubular member for sealing the telescopic tubular member in its extended position in the second packer, `and separate means also arranged on the outer surface of said telescopic tubular member for locating and stationarily positioning said telescopic tubular member in said second packer whereby said telescopic tubular member is maintained in its extended position.

13. Apparatus in accordance with claim 12 in which the lower end of the telescopic sleeve is closed with a removable plug.

14. An assembly for separate production of uids from separate zones in a well having a casing therein which comprises a iirst well tubing in the casing arranged with its lower end above a rst Zone, a rst packer arranged on said iirst well tubing adjacent its lower end, a second packer arranged in said casing below the irst well tubing, said first and second packers isolating first and second zones in said well, said casing being perforated opposite said zones, the iirst Zone being in tluid communication with the space within the casing between the packers and the second zone being in fluid communication with the casing below the second packer, a retrievable elongated tubular member provided with means on its upper end for suspending said elongated tubular member in said irst well tubing at a selected point above the tlrst zone and adjacent the first packer, a telescopic tubular member carried by the elongated tubular member on its lower end, one of said tubular members being arranged in embraceable relationship with the other of said tubular 'members, coengageable means on each of said tubular members for maintaining said tubular members together when in an extended position, the embraced outer peripheral surface of said embraced one of said tubular members being provided with serrations, holding means in said elongated member engaging with said telescopic tubular member and initially holding said telescopic tubular member in a telescopcd position, and spring biased means carried by said elongated tubular member engageable with said serrations for locking said telescopic tubular member against telescoping movement on release of said holding means, said holding means being released by exerting pressure against said telescopic tubular member, sealing means on the upper end of said elongated tubular member for sealing said elongated tubular member in said first tubing, sealing means arranged on the outer surface of the telescopic tubular member for sealing the telescopic tubular member in its extended position in the second packer, separate means also arranged on the outer surface of said telescopic tubular member for locating and stationarily positioning said telescopic tubular member in said packer whereby said telescopic tubular member is maintained in its extended position, and a second tubing communicating tluidly with said space for production of fluid from the iirst zone, production of uid from the second zone being through the telescopic tubular member and the elongated tubular member into the rst tubing.

15. An yassembly for separate production of iluids from separate zones in a Well having a casing therein which comprises a lirst well tubing in the casing arranged with its lower end above a rst zone, a rst packer arranged on'said first well tubing adjacent its lower end, a second packer arranged in said casing below the irst well tubing, said rst and second packers isolating rst and second zones in said well, said casing being perforated opposite said zones, the rst zone being in liuid communication with the space within the casing between the packers and the second Zone being in iluid communication with the casing below the second packer, a retrievable elongated tubular member provided with means on its upper end for suspending said elongated tubular member in said rst well tubing at a selected point above the first zone and adjacent the rst packer, a telescopic tubular member carried by the elongated tubular member on its lower end,- one of said tubular members being arranged in embraceable relationship with the other of said tubular members, coengageable means on each of said tubular members for maintaining said tubular members together when in an extended position, the embraced outer peripheral surface of said embraced one of said tubular members being provided with serrations, holding means in said elongated tubular member engaging with said telescopic tubular member and initially holding said telescopic tubular member in a telescoped position, and spring biased means carried by said elongated tubular member engageable with said serrations for locking said telescopic tubular member against telescoping movement on release of said holding means, said holding means being released by exerting pressure against said telescopic tubular member, sealing means on the upper end of said elongated tubular member -for sealing said elongated tubular member in said rst well tubing, a separately retrievable tubular member releasably attached fto the lower end of the telescopic tubular member,

said separately retrievable tubular member having means arranged on its outer surface for sealing the separately retrievable tubular member in the s econd packer, separate means also arranged on the outer surface of said separately retrievable tubular member for locating and stationarily positioning said separately retrievable tubular member in the second packer wherebyv the telescopic tubular member is maintained in its extended position, and a -second tubing communicating uidly with said space for production of uid from the rst zone, production of ftluid from the second zone being through the telescopic tubular member and the elongated tubular member into the rst tubing.

16. Apparatus adapted for use in ya well which comprises a retrievable elongated tubular member provided with means on its upper end for suspending said elongated tubular member at a selected point in a well pipe, said elongated tubular member being comprised of a. telescoping tubular section and a tubular sleeve section arranged within the telescoping tubular section and forming the lower end of the elongated tubular member, one of said sections being movable relative to the other section, said sections each being provided with coengageable means for maintaining said sections together when in an extended position, said inner sleeve section being formed to provide -serrations on its outer peripheral surface, holding means in said elongated tubular member initially holding said sections in telescoped position, and spring biased means carried by said elongated tubular member engageable with said serrations for locking said telescoping sleeve section against telescoping movement relative to said sleeve section on release of said holding means by exerting pressure against said inner sleeve.

17. Apparatus in accordance with claim 16 in which the sleeve section is rigidly connected to the telescoping section.

18. Apparatus in accordance with claim 16 in which the sleeve section is slidably connected to the telescoping section.

19. Apparatus in accordance with claim 16 in which the telescoping vsection is slidably connected to the lower end of the sleeve section.

20. Apparatus in laccordance with claim '16 in which the telescoping section is movably mounted on the sleeve sectlon.

References Cited in the le of this patent UNITED STATES PATENTS 2,368,428 Saurenman Jan. 30, 1945 2,749,989 Huber June 12, 1956 2,757,741 OReilly Aug. 7, 1956 2,782,860 Tausch et al. Feb. 26, 1957 2,822,048 Tausch Feb. 4, 1958

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