US2751014A

US2751014A - Well testing tool

Info

Publication number: US2751014A
Application number: US244918A
Authority: US
Inventors: Mordica O Johnston; Harry C Skipper
Original assignee: Johnston Testers Inc
Current assignee: Johnston Testers Inc
Priority date: 1951-09-04
Filing date: 1951-09-04
Publication date: 1956-06-19
Anticipated expiration: 1973-06-19

Description

June 19, 1956 M o, JOHNSTON ET AL. 2,751,014

WELL TESTING TOOL 'Filed Sept. 4, 1951 2 Sheets-Sheet l rraeA/iyf June 19, 1956 M. o. JOHNSTON ET Al. 2,751,014

WELL TESTING TOOL Filed Sept. 4, 1951 2 Sheets-Sheet 2 ,c'/6.4 ,1.76.5 V/m u mm IN VEN TOR5 MORO/c4 0. ./aH/vira/v #449er c, .5K/ppi@ fm@ JM Arrow/5x5 United States Patent WELL TESTING TOOL Mordica 0. Johnston, Glendale, and Harry C. Skipper, Montrose, Calif., assignors, by mesne assignments, to Johnston Testers, Inc., Houston, Tex., a corporation of Texas Application September 4, 1951, Serial No. 244,918

8 Claims. (Cl. 166-145) This invention relates to an oil well tool and particularly to an oil well tool especially adapted to be incorporated in a formation tester.

Although the present invention will be described as being incorporated in a formation tester, the invention is not necessarily intended to be limited by this reference.

The standard formation tester, such as disclosed in the patent to M. O. Johnston, 2,073,107 for Well Testing Method and Apparatus Therefor, includes a packer adjacent the lower end thereof adapted to be set in a well bore or casing to separate the formation zone below the packer from the well fluid above the packer, and an equalizing valve normally open when the formation tester is run into the well to allow bypassing of the packer during running in. The standard formation tester also includes a retaining valve, disposed above the equalizing valve and adapted to be opened upon a partial telescopic movement of the formation tester, and a trip valve, adapted to be opened by dropping a go-devil down the drill string to trip the trip valve, such valves when opened allowing formation fluid, entering a perforated anchor below the packer, to flow upwardly through the formation tester and into the drill string. The retaining valve is then adapted to be closed to entrap the fluid.

It is frequently desirable, after a formation test has been made, to make a shut-in test, that is, to close the retaining and equalizing valves and shut in the formation zone so that a suitable pressure recording device, usually disposed below the anchor, can make a record of the pressure of the formation zone. It is also desirable when a packer becomes stuck in place to be able to pump fluid down through the drill string and formation tester and out through the perforated anchor to apply a force to the underside of the packer so that by a combination of this force and an upward yank on the drill string, the packer may be unseated without damage to the packer or to the formation tester or drill string.

A main object of the present invention is to provide an improved oil well tool which is simple in construction and operation and which may be operated to accomplish the above described results.

It is a more particular object of the present invention to provide an oil well tool as above described having a central tubular mandrel telescopically received within a tubular housing, said central tubular mandrel having retaining valve ports formed therein, and said housing having equalizing valve ports formed therein, and wherein by a partial telescopic movement of the mandrel within the housing the equalizing ports in the housing can lirst be closed by means carried by the mandrel and then the retaining valve ports can be opened.

Another object of the present invention is to provide an oil well tool as described in the immediately above paragraph in which the retaining valve ports in the mandrel can subsequently be closed, with part of the weight of the drill string imposedon the packer, by means reponsive to rotation of ,the tubular mandrel.

2,751,014 Patented .19, 1956 ice Various other objects of the present invention will be' i apparent from the following description taken in connection with the accompanying drawings, wherein.' l

Fig. 1 shows a standard formation tester having the oil well tool of the present invention incorporated therein.'

Figs. 2 and 3 show, respectively, the upper and lower portions of the oil well tool disclosed in Fig. l, Figs'. 2 and 3 being enlarged longitudinal mid-sectional views.

Fig. 4 is a longitudinal mid-sectional view in some'- what schematic form of the oil well tool disclosed i' Figs. 2 and 3 and showing the central mandrel as having been moved to close the equalizing valve ports in the housing and open the retaining valve ports in the mandrel.

Fig. 5 is a view similar to Fig. 4 showing the equalizing valve ports as remaining closed and the retaining valve ports as being closed by the traveling nut.

Fig. 6 is a horizontal sectional view taken along line 6 6 of Fig. 3 showing the key connection between the mandrel and the housing.

Fig. 7 is a view taken along line 7-7 of Fig. 3 showing the key connection between the mandrel and the traveling nut.

Referring to the accompanying drawings wherein similar reference characters designate similar parts throughout, Fig. 1 shows a formation tester including a tubular assembly 9 adapted to be connected at its upper end to the lower end of a drill string (not shown) and having adjacent its lower end a packer 11 adapted to be seated in a Well bore to seal or block the well bore so as to separate the formation zone below the packer 11 from the well fluid in the bore above the packer. On its lower end, the formation tester has a perforated anchor 13 and below the anchor there may be provided a pressure recording device (not shown).

The oil well tool embodying the concepts of the present invention is best shown in Figs. 2 and 3 and comprises a central tubular mandrel 15 telescopically receivable within a composite tubular housing 17 including an upper sub 19, a nut housing 21 and a lower sub 23, all suitably threadedly connected together as shown. Tubular mandrel 15 may conveniently be made of an upper tubular mandrel section 15a and a lower tubular mandrel section 15b.

The upper end of tubular mandrel 15 is connected to the upper portion of the formation tester, generally entitled 25 (see Fig. l) whereby the central tubular mandrel can be telescoped within the tubular housing 17 by a downward movement of the drill string to which the upper portion 25 of the formation tester is connected. This telescopic movement of tubular mandrel 15 relative to the tubular housing 17 is utilized to open and close various valves within the tubular housing in a manner to be explained. Surrounding tubular mandrel 15 is a strong compression spring 27 which is compressed upon a telescopic movement of the tubular mandrel 15 relative to the housing 17 caused by a partial imposition of the weight of the drill string on the central tubular mandrel, and is operable to return the tubular mandrel and housing to their original position when the weight of the drill string is relieved. The lower end of compression spring 27 rests on a thrust bearing 29 which in turn rests upon a split ring 31 mounted upon the upper end of upper sub 19.

There is packing 33 sealingly engaging the exterior of tubular mandrel 15 adjacent the upper end thereof, as shown in Fig. 3, and retained within upper sub 19, through which the mandrel slidably extends, by a packing gland or nut 35.

.The mandrel 15 is releasably keyed to housing 17 by a key 37 iitting within a keyway 39 formed in upper sub 19. There is anenlarged b ore 19a formed on the interior.4

of sub 19 in which a flange 41 formed on the mandrel I is slidably received, and within which bore the key 37 is adapted to be disposed to clear the keyway 39 and therefore allow rotative movement between the tubular mandrel and housing 17. Key 37, when within the keyway, provides a rotative drive between the mandrel and the housing to enable manipulation of devices below the mandrel' and also to enable loosening of the packer 11. Flange 41 is adapted to abut against a shoulder 19b to limit upward movement of mandrel relative to housing 17 and adapted to abut against the upper end 21a of nut housing 21 to limit downward movement of mandrel 15 relative to housing 17.

Adjacent its lower end, mandrel 15 slidably extends through an externally threaded sleeve or traveling nut 43 operatively threadedly receivedv by nut housing 21, as clearly shown in Fig. 2, travelingl nut 43 initially occupying the position shown in Figs. 2 and 3 with the upper end thereof in abutment with a downwardly facing shoulder 2lb formed on housing 21.

Mandrel I5 has a second key 45 formed thereon slidably disposed within a vertical keyway 47 formed on the interior of traveling nut 43. Key 45 and keyway 47 prevent rotation between mandrel 15 and traveling nut 43 so that upon rotative movement between mandrel 15 and housing, 17, nut 43 will travel downwardly for a purpose to be described hereinafter.

There is also a horizontally disposed' circumferential keyway 49 formed on the interior of traveling nut 43 (compare Figs. 3 and 7) into which the key 45 is adapted toV be moved when the circumferential keyway and the key are brought into registry with one another. As is clearly apparent from Figs. 2 and 3, when traveling nut 43 is in itsV initial position, as shown in these gures, it is impossible for key 45 to move into the circumferential keyway 49 because the keyway is disposed out of registryA with the key.

Adjacent its lower end, mandrel 15 has formed therein a plurality of laterally extending ports 51 adapted to communicate the exterior of the mandrel with the interior thereof and being initially closed by traveling nut 43 as clearly shown iny Fig. 2.

For' providing a sealing engagement between traveling nut 43 and mandrel 15, there are a pair of O rings 53 extending around and carried by tubular mandrel 15 below ports- 51, and a` single O ring 55 extending around and carried by the tubular mandrel 15 above ports 51.

Tubular mandrel 15 isadapted to be projected out of traveling nut 43V from the position shown in Fig. 2 to the positionV shown in Fig. 4 to expose the ports 51. When the ports are exposed, it is desirable to protect the lower pair of O rings 53 from the eroding effect of the high velocity formation fluid jettiug into the tubular mandrel. To effect this protection, a depending cage 57 is provided and is threadedly connected to the lower end of traveling nut 43 and functions to surround and protect O rings 53 when the O rings are projected, as shown in Fig. 4.

Threadedly received on the lower end of traveling nut 43 is a packing gland 59 holding packing 61 in place between the exterior of the traveling nut 43 and the interior of the nut housing 19.

Lower sub 23 has a plurality of laterally extending equalizing ports 63 formed' therein adapted to be protected by a perforated guard 65 extending around sub 23. These equalizing ports are initially open when the drill string is run into the well, Figs. 2 and 3 showing such position of the parts, to allow lluid in the well to bypass the packer 11 to permit the formation tester to be readily lowered into the well through well fluid, the exterior of packer 11 being normally disposed so close to the well bore that the well uid does not pass by the packer as rapidly as desired.

After thepacker is set, itis desirable to closel the equalizig ports, and to this end there is providedv an equalizing valve member 67 threadedly secured to the lower end of tubular mandrel l5 and adapted to cover equalizing ports 63 when mandrel 15 is lowered from the position shown in Fig. 2 to that shown in Fig. 4. As is apparent from a comparison of Figs. 2 and 4, the equalizing ports 63 will be closed prior to the exposing of the retainer ports 51, which is the desirable sequence of events.

Equalizing valve member 67 is counterbored at 67a to provide an annular space between the upper end of valve member 67 and the exterior of the lower end of tubular mandrel 15. Communicating with the annular space thus provided are a plurality of passageways 67b extending vertically through equalizing valve member 67 and communicating at their lower ends with the interior of lower sub 23. Equalizing valve member 67 carries on the exterior thereof annular packing 69 held in place by a packing gland 71 threadedly received on the exterior of equalizing valve member 67.

Threadedly secured to the lower end of equalizing valve assembly 67 is a downwardly opening spring-loaded circulation valve assembly 73, whichk circulation valve allows fluid to be pumped down through tubular mandrel 15 out through the circulating valve and down through the formation tester to below the packer 11 for a purpose to be described.

The operation of the device is as follows: Initially, when the formation tester is run in the well bore, the parts of the device of the present invention assume the positions shown in Figs. 2 and 3 under the inuence of strong compression spring 27 with the traveling nut 43 disposed against the shoulder 2lb and with the retaining ports 51 covered by the traveling nut 43 and with the equalizing ports 63 open. Fluid in the well can flow through the anchor 13 up through the formation tester out through the ports 63 and thereby allow the formation tester to be readily run into the well bore without undue resistance by the fluid in the well.

The packer 11 is then set to separate the formation zone below the packer from the well lluid above the packer. Thereafter, a part of the weight of the drill string. is imposed upon the compression spring 27 to compress the spring and project the tubular mandrel 15 farther out ofthe traveling nut 43 to rst close equalizing ports 63 and thereafter uncover or expose the retaining ports 51. The packer 11 is, therefore, held against its seat by the partial weight imposed on. the drill string. If a trip valve is provided in the tester, it is then tripped. Formation fluid below the packer can ow through the anchor up through the parts disclosed in Fig. 4 through the retaining ports 51 into the tubular mandrely 15 and upwardly through the formation tester.

After the lapse of a suitable interval of time suicient to allow the formation test to be properly completed, and if it is desirable to merely remove the drill string with the sample trapped, and if the packer olfers no serious difficulty to unseating, the drill string may merely be pulled upwardly relieving the weight ofthe drill string from the formation tester, allowing compression spring 27 to cause a retracting movement of mandrel 15 to once again dispose the ports 51 within the confines of the traveling nut 43 to cl'ose the portsA and move the equalizing valve member 67 upwardly to uncover equalizing ports 63 thereby allowing upward movement of the drill string and bypassing of the well' uid above the packer through the drill string andk down through the anchor 13.

However, it is frequently desirable` after a drill stern test has been. made toy make a shut-in test, that is, toshut in the formationA pressure after the test has been made. It is important that the partial weight of the drill string remain impose on the packer to ensure that thel formation zone is sealed offV and to thereby enable the making of an accurate record of the pressure of the formation fluid by the pressure recorder carried by the lower end of the anchor 13. To effect this shutting in of the formation out relieving the Weight of the drill stringi This can be achieved by rotating the drill string, such rotation being permitted since the key 37 and keyway 39 are disengaged, as clearly shown in Fig. 4. Rotation of the drill string will cause rotation of tubular mandrel 15 which by its key 45 will cause a downward movement of traveling nut 43, the drill `string being rotated to the right under these conditions. The traveling nut 43 moves downwardly from the position shown in Fig. 4 to the position shown in Fig. 5 covering retainer ports 51. Since the equalizer valve 67 is in closed position, both sets of

ports

51 and 63 are closed, thereby shutting in the formation pressure an-d thereby enabling the pressure recorder to make an accurate record of the formation pressure. The above action not only shuts in the formation pressure but also traps the sample within the drill string and formation tester within and above the tubular mandrel 15.

It may occasionally happen that the packer 11 will become tightly stuck in the bore of the well and present a difficult problem of removal since ,it is not desirable to damage the packer, but, even more serious, is the possible damage to the formation tester and drill string by a Severe upward pull or yank on the drill string. In order to unseat the packer 11 without the possibility of the above described detrimental effects, the drill string can be rtated to the left to cause the key 45 on the mandrel to enter the circumferential keyway 49 of the traveling nut 43, the upper end 23a of sub 23 being operable to stop travel of the traveling nut 43 in a position where the key 45 is in registry with the keyway 49, as clearly shown in Fig. This lefthand turn of the drill string and tubular mandrel 15 will cause the key 45 to enter the circumferential keyway 49 and therefore allow an upward pull upon the nut 43 and therefore the tubular housing and therefore the packer 11 by engagement of the upper face of key 45 with the downwardly facing shoulder defining the upper end of circumferential keyway 49. Since equalizing ports 63 are closed, fiuid is pumped down the drill string and tubular mandrel 15, out through the downwardly opening circulation valve 73, through the anchor 13 to the underside of the packer 11 to provide a simultaneous upward force on the underside of packer 11. This combination of forces will be effective to unseat the packer without undue strain on the drill string or formation tester or Without unduly damaging the stuck packer.

By the present invention, a simple and easily operated oil well tool has been provi-ded by which a multiplicity of operations can be easily and readily effected in a manner not heretofore possible.

While I have shown the preferred form of my invention,` it is to be understood that various changes may be made in its construction by those skilled in the art without departing from the spirit of the invention as defined in the appended claims.

Having thus described our invention, what we claim and desire to secure by Letters Patent is:

l. An oil well tool comprising a tubular housing, a sleeve disposed within and threadedly engaging the interior of the housing, a tubular mandrel slidably received by the sleeve, means preventing relative rotation between said sleeve and said mandrel, lateral ports in said mandrel adjacent to and above the bottom of said sleeve when said mandrel is in its upper position relative to said sleeve, lateral ports in said housing below and spaced from the bottom of said sleeve, said housing ports providing fluid communication between the interior and the exterior of the housing, a second sleeve slidable within said housing located below said first sleeve and above said housing ports, means connecting said second sleeve to said mandrel, a passageway through said second sleeve permitting fluid flow from below to above the second sleeve, whereby upon downward movement of said mandrel relative to said housing the second sleeve will cover said housing ports and the mandrel ports will move out of said first sleeve,

and upon subsequentrotation of said mandrel, thefrst sleeve win be threaded downwardly to agai'scevef said mandrel ports. A

2. An oil well tool comprising a tubular housing adapt-A ed to be connected at its lower endto a well packer, a sleeve disposed within and threadedly engaging the interior of the housing, a tubular mandrel adapted to be connected at its upper end to a well string, said mandrell being slidably received by the sleeve, means preventing relative rotation between said sleeve and said mandrel the key when the mandrel and the sleeve are in their upper positions and adapted to be brought into registry with the key when the sleeve is threaded downwardly to vpermit the mandrel to be rotated relative to said sleeve t0- place the key within said recess, lateral ports'in said mandrel adjacent to and above the bottom of said sleeve when said mandrel is in its upper position, lateral ports in said housing below and spaced from the bottom o fl .said sleeve, said housing ports providing iiuid communication between the interior and the exterior of said housing,v

a second sleeve sli-dable within said housing located below the first sleeve and above said housing ports, means connecting said second sleeve to said mandrel,` a passageway through said second sleeve permitting fiuid ow from below to above the second sleeve, whereby upon downward movement of said man-drel relative to said housing the second sleeve will cover said housing ports and the mandrel ports will move out of said first sleeve, and upon subsequent rotation of said mandrel the first sleeve will be threaded down to again cover said mandrel ports and to bring said key in register with said circumferentially extending recess, permitting the key to enter said recess.

3. An oil well tool comprising a tubular housing adapted to be connected at its lower end to a well packer, a sleeve disposed within and threadedly engaging the interior of the housing, a tubular mandrel adapted to be connected at its upper end to a well string, said mandrel being slidably received by the sleeve, means 'preventing relative rotation between said sleeve and said mandrel,`

lateral ports in said mandrel adjacent to and above the bottom of said sleeve when said mandrel is in its upper position relative to said sleeve, lateral ports in saidy housing below and spaced from the bottom of said sleeve, said housing ports providing fluid communication between the 1 interior and the exterior of said housing, a second sleeve slidable within said housing located below said first sleeve and above said housing ports, the distance of said second` sleeve above said housing ports being less than the distance v of said mandrel ports above the bottom o f said first sleeve,

means connecting said second sleeve to said mandrel, a passageway through said second sleeve permitting fluid fiow from below to above the second sleeve, whereby upon downward movement of said mandrel relative to said housing the second sleeve will first cover said housing ports and subsequently the mandrelV ports will move out of said first sleeve, and upon subsequent rotation of said mandrel the first sleeve will be threaded downwardly to again cover said mandrel ports.

4. An oil well tool comprising adapted to be connected at its lower end to a well packer,- a sleeve disposed within and threadedly engaging the interior of the housing, a tubular mandrel adapted to be connected at its upper end to a well string, said mandrel being slidably received by the sleeve, means preventing relative rotation between said sleeve and said mandrel comprising a key on the mandrel engaging a vertical keyway'in said sleeve, a recess formed interiorly of said sleeve opening into and extending circumferentially from the upper end of the keyway, said recess being disposed'above `said key in non-registering position with respect to the key when the mandrel and the sleeve are in theirv upper positions i a tubular housingV and adapted to be brought into registry with the key when the first sleeve is threaded downward to permit the mandrel to be rotated relative to said first sleeve to place the key in said recess, lateral ports in said mandrel adjacent to and above the bottom of said sleeve when said mandrel is in its upper position relative to said sleeve, lateral ports in said housing below and spaced from the bottom of said sleeve, said housing ports providing fluid communication between the interior and the exterior of said housing, a second sleeve slidable within said housing located below said first sleeve and above said housing ports, the distance of said second sleeve above said housing ports being less than the distance of said mandrel ports above the bottom of said first sleeve, means connecting said second sleeve to said mandrel, a passageway through said second sleeve permitting fiuid to ow from below to above the second sleeve, whereby upon downward movement of said mandrel relative to said housing the second sleeve will first cover said housing ports and subsequently the mandrel ports will move out of said first sleeve, and upon subsequent rotation of said mandrel the first sleeve will be threaded downwardly to again cover said mandrel ports and to bring said key in register with said circumferentially extending recess permitting the key to enter said recess.

5. An oil well tool comprising a tubular housing, a sleeve disposed within and threadedly engaging the housing, a packer device carried by the housing including a packer adapted to be set in the well bore, a perforated anchor connected to said packer device below the packer providing for ingress of fluid into the packer device and therefrom into the housing, a tubular mandrel slidably received by the sleeve, means preventing relative rotation between said sleeve and said mandrel, lateral ports in said mandrel adjacent to and above the bottom of said sleeve when said mandrel is in its upper position relative to said sleeve, lateral ports in said housing below and spaced from the bottom of said sleeve, said housing ports providing fluid communication between the interior and the exterior of the housing, a second sleeve slidable within said housing located below said first sleeve and above said housing ports, means connecting said second sleeve to said mandrel, a passageway through said second sleeve permitting fluid How from below to above the second sleeve, whereby upon downward movement of said mandrel relative to said housing the second sleeve will cover said housing lports and the mandrel ports will move out of said first sleeve, and upon subsequent rotation of said mandrel the first sleeve will be threaded downwardly to again cover said mandrel ports.

6. An oil well tool comprising a tubular housing, a sleeve disposed within and threadedly engaging the housing, a packer device carried by the housing including a packer adapted to be 'set 'in the well bore, a perforated anchor `connected to said packer device below the packer providing for ingress of fluid into the packer device and therefrom into the housing, a tubular mandrel adapted to be connected at its upper end to a well string, said mandrel being slidably received by the sleeve, means preventing relative rotation between said sleeve and said mandrel comprising a key on the mandrel engaging a keyway on said sleeve, said sleeve having a recess formed interiorly thereof opening into and extending circumferentially from the upper end of the keyway, said recess being disposed above said lkey in non-registering position with respect to the key when the mandrel and the sleeve are in their upper positions and adapted to be brought into registry with the key when the first sleeve is threaded downwardly to permit the mandrel t be rotated relative to said first sleeve to place the key within vsaid recess, lateral ports in said mandrel adjacent to and above the bottom of said sleeve when said 'mandrel is n its upper position relative to said sleeve, lateral ports in said housing below and spaced from the bottom of .said sleeve, said housing .ports providing liuid communication between the Vinterior and exterior of said housing, a second sleeve slidable within said housing,

located below the first sleeve and above said housing ports, means connecting said second sleeve to said mandrel, a passageway through said second sleeve permitting fluid flow from below to above the second sleeve, whereby upon downwardv movement of said mandrel relative to said housing the second sleeve will cover said housing ports and the mandrel ports will move out of said first sleeve, and upon subsequent rotation of said mandrel the first sleeve will move downwardly to again cover said mandrel ports and to bring said key in register with said circumferentially extending recess permitting the key to enter said recess.

7. An oil well tool comprising a tubular housing, a sleeve disposed within and threadedly engaging the housing, a packer device carried by the housing including a packer adapted to be set in the well bore, a perforated anchor connected to said packer device below the packer providing for ingress of fluid into the packer device and therefrom into the housing, a tubular mandrel adapted to be connected at its upper end to a well string, said mandrel being slidably received by the sleeve, means preventing relative rotation between said sleeve and said mandrel, lateral ports in said mandrel adjacent to and above the bottom of said sleeve when said mandrel is in its upper position relative to said sleeve, lateral ports in said housing below and spaced from the bottom of said sleeve, said housing ports providing fluid communication between the interior and the exterior of said housing, a `second sleeve slidable within said housing located below said first sleeve and above said housing ports, the distance of said second sleeve above said housing ports being less than the distance of said mandrel ports above the bottom of said first sleeve, means connecting said second sleeve to said mandrel, a passageway through said second sleeve permitting fluid ow from below to above the second sleeve, whereby upon downward movement of said mandrel relative to said housing the second sleeve will first cover said housing ports and subsequently the mandrel ports will move out of said first sleeve, and upon subsequent rotation of said mandrel the first sleeve will be threaded downwardly to again cover said mandrel ports.

8. An oil well tool comprising a tubular housing, a sleeve disposed within and threadedly engaging the housing, a packer device carried by the housing including a packer adapted to be set in the well bore, a perforated anchor connected to said packer device below the packer providing for ingress of fluid into the packer device and therefrom into the housing, a tubular mandrel adapted to be connected at its upper end to a well string, said mandrel being slidably received by the sleeve, means preventing relative rotation between said sleeve and said mandrel comprising a key on the mandrel engaging a vertical keyway in said sleeve, a recess formed interiorly of said sleeve opening into and extending circumferentially from the upper end of the keyway, said recess being disposed above said key in non-registering position with respect to the key when the mandrel and the sleeve are in their upper positions and adapted to be brought into registry with the key when the first sleeve is threaded downwardly to permit the mandrel to be rotated relative to said first sleeve to place the key in said recess, lateral ports in said mandrel adjacent to and above the bottom of said sleeve when said mandrel is in its upper position relative to said sleeve, lateral ports in said housing below and spaced from the bottom of said sleeve, said housing ports providing fluid communication between the interior and the exterior of said housing, a second sleeve slidable within said housing located below said first sleeve and above said housing ports, the distance of said second sleeve above said housing ports being less than the distance of said mandrel ports above the bottom of said first sleeve, means connecting said second sleeve to said mandrel, a passageway through said second sleeve permitting fluid to ow from below to above the second sleeve, whereby upon downward movement of said mandrel relative to said housing the second sleeve will rst cover said housing ports and subsequently the mandrel ports will move out of said rst sleeve, and upon subsequent rotation of said mandrel the rst sleeve will be threaded downwardly to again cover said mandrel ports and bring said key in register with said circumferentially extending recess permitting the 5 key to enter said recess.

References Cited in the file of this patent UNITED STATES PATENTS 1,804,620 Hux May 12, 1931 10 10 Humason et al. Apr. 30, 1940 Edwards Sept. 10, 1940 Boynton Nov. 10, 1942 Coberly Feb. 16, 1943 Kinney Aug. 17, 1943 Crowell Apr. 2, 1946

Claims

1. AN OIL WELL TOOL COMPRISING A TUBULAR HOUSING, A SLEEVE DISPOSED WITHIN AND THREADEDLY ENGAGING THE INTERIOR OF THE HOUSING, A TUBULAR MANDREL SLIDABLE RECEIVED BY THE SLEEVE, MEANS PREVENTING RELATIVE ROTATION BETWEEN SAID SLEVE AND SAID MANDREL LATERAL PORTS IN SAID MANDREL ADJACENT TO AND ABOVE THE BOTTOM OF SAID SLEEVE WHEN SAID MANDREL IS IN ITS UPPER POSITION RELATIVE TO SAID SLEEVE, LATERAL PORTS IN SAID HOUSING BELOW AND SPACED FROM THE BOTTOM OF SAID SLEEVE, SAID HOUSING PORTS PROVIDING FLUID COMMUNICATION BETWEEN THE INTERIOR AND THE EXTERIOR OF THE HOUSING, A SECOND SLEEVE SLIDABLE WITHIN SAID HOUSING LOCATED BELOW SAID FIRST SLEEVE AND ABOVE SAID HOUSING PORTS, MEANS CONNECTING SAID SECOND SLEEVE SAID MANDREL, A PASSAGEWAY THROUGH SAID SECOND SLEEVE PREMITTING FLUID FLOW FROM BELOW TO ABOVE THE SECOND SLEEVE, WHEREBY UPON DOWNWARD MOVEMENT OF SAID MANDREL RELATIVE TO SAID HOUSING THE SECOND SLEEVE WILL COVER SAID HOUSING PORTS AND THE MANDREL PORTS WILL MOVE OUT OF SAID SLEEVE, THE FIRST AND UPON SUBSEQUENT ROTATION OF SAID MANDREL, THE FIRST SLEEVE WILL BE THREADED DOWNWARDLY TO AGAIN COVER SAID MANDREL PORTS.