US2248211A - Well tool - Google Patents

Description

July 8, 1941.

B. YOUNG WELL TOOL Filed Feb. 25, 1939 2 Sheets-Sheet 1 I f/v VE/V 70/2 505' YOUNG WM 511mm firro'zP/vfr B. YOUNG July 8, 1941.

WELL TOOL v 2 Sheets-Sheet 2 Filed Feb. 25, 1939 m m H WW 6 W m N: .7 in p Patented July 8, 194 1 UNlTED STATES PATENT OFFICE Bob 1:2 Htfsfn, Tex.

Application February 25, 1939, Serial No. 258,392

7 Claims.

The invention relates to a well tool and more particularly to a tool which is adapted to be lowered into a well bore upona tubing string and to form a pack-oil at a desired level.

In deep well operations such as the drilling and production of wells it is frequently desirable to provide a pack-oil between a tubing string and the surrounding well bore or tubing. As examples of such operations reference is made to sample taking or formation testing, cementing, screen cleaning, etc. In such cases a period during which a device is stationary within a well may resultin sticking of the device by sedimentation, caving, heaving or the setting of cement where cementing is being carried out. It is an object of the invention to provide a tool which includes a packer and which is so constructed that the operating stringand portions of the tool may be rotated after the packer is set.

' It is also an object of the invention to provide a device of the class described in which a mandrel is rotatably connected to the remainder of the device.

Another object is to provide a device' which includes an anchor and packer assembly in which the anchor and packer may be successfully set by the application of lifting force upon the lowering mechanism. Still another object is to provide a device of the class described to be attached to a tubing string and in which slips may be initiallyset by pumping fluid downwardly thru the string and device.

The foregoing objects together with other objects will be apparent, from the following description' taken in connection with the accomticn is shown attached to a. tubing string l a or mandrel 2 surroundedby a pack off assembly positions when the anchoring mechanism is ac.-

tuated.

Fig. 8 illustrates the relative position of parts in the modified construction when both the anchor and packer are set.

In Figs. 1 and 2 an embodiment of the invenand as comprising a cylindrical body member generally designated as 3.

The reducer connection 4 interconnects the tubing i and the body 2 the latter of which terminates at its lower end in a collar 4' pro- I vided with threads 5 whereby a suitable tool may be connected thereto and rotated by rotative efiort imparted to the tubing string l. The mechanism for lowering the device while in in operative position to a desired level within a casing or tubing 6 and thereafter setting the device at such desired level will now be described.

The assembly 3 includes-an antifrlction bearing l0 interposed between upwardly facing shoulder ii on the collar 4' and a lower packer ring l2 mounted on mandrel 2. the ring [2 and surrounding the body 2 is an expansible packer ring l3 reduced peripherally at M to fit within a-complementary recess in panding movement to slips l8 surrounding the expander member and provided with upwardly projecting teeth 20 for engagement with the panying drawingsin which Figs. 1 and 2 are elevational views partly in section showing an embodiment of the invention.

Fig. 3 is a sectional view taken on the line 3-.3 of Fig. 1.

Fig.4 is a .sectional view taken on line 4-4- in Fig. 1.

Fig. 5 is an assembly view partly in section' showing the relative position of parts when the .tool is set within the tubing string in a bore hole.

Fig. 6 illustrates'a modification'ofthe packer Fig. 7 is a fragmentalview showing the'consh'uction' oi 'Fig. 6 with the parts in respective casing 6 when the tool is .in use.

Above the tapered portion I! the expander member has a cylindrical portion l9 which extends upwardly to a point closely adjacent the shoulder 2! at the lower end of the connector 4.

Surrounding the cylindrical portion IQ of the expander member is a spring cage 22 provided with bowed springs 23 which .are secured within slots 24 in the surface of member 22, and adapted to engage the casing 6 to provide sufllcient frictional contact that there is a tendency for the anchor packer assembly 3 to remain atany desired'position within the casing. An internal groove 25 in the lower 'end of the spring cage 22 receives flanges 26 at the upper ends of the slipsl8 whereby these slips are freely carried at the lower end ef the'spring cage and may be moved radially of the device in a manner that will be more fully apparent.

Surmounting' The connector i is provided with projections or trunnions 3B which are adapted to move into the open ended slots iii of cage 22 and to engage within the undercut portion 32 of the slots. It is believed apparent that as the device is being lowered into or withdrawn from the casing 6, the anchor packer assembly 3 is caused to move together with the remainder of the device thru the driving force exerted between the projections 39 and the undercut portion 32 of the slips 3i.

The operation of the construction as above described is believed apparent. Attention is directed to the fact that when the device has reached a desired level within the well the tubing string i may be rotated left handedly sufliciently to disengage the projections 30 from within their respective slots in the cage 22. A lifting effort is then applied to the tubing string l whereupon initial movement of the body 2 relative to the remainder of the device will cause the slips i8 to ride upon tapered surface i1 and thus be brought into engagement with the inner surface of the casing 6. This action is instrumental in fixedly anchoring the anchor and packer assembly within the casing.

Further lifting of the tubing string i will cause the pins 30 to move from within the open ended slots 3| and will at the same time exert suflicient force upon the lower packer ring i2 that the packer sleeve i3 will be brought into sealing en gagement with the casing 6 so that the parts of the device will assume the relative positions illustrated in Fig. 5. In this manner an efiective seal will be made between the body 2 and the casing 6. The provision of antifriction hearing I!) will. however, permit the tubing string I together with the body 2 to be rotated so that the tendency of the device to become stuck from sedimentation or other sources will be minimized.

The modification illustrated in Figs. 6, 7 and 8 is designed to enable the initial setting of the slips l8 by merely pumping fluid downwardly thru the bore within the body 2. This action is brought about by providing a chamfer in the recess in the expandermember and the upper end of the packer sleeve ii to form a small chamber 33. An opening 3 i leads from the interior of the ,body 2 to the chamber 33.

It is to be noted that the channel ,in the expander member l6"in this construction is deeper than thatshown in the embodiment of Figs. 1 and 2 and that the upper end of the packer member i3 is elongated to fit within this channel. Hence when fluid is pumped downwardly thru the tubing string l and the body 2, pressure is exerted with- 'in the chamber 33 and the expander i6 is moved upwardly to the position illustrated in Fig, '7.

Thisprovides an initial setting of the slips 18. 7 Subsequent release of the body 2 from the spring cage 22 permits the tubing string itobe moved so that the packer sleeve I! will move upwardly within the channel in the member l8. At the same time the passage 3! will move upwardly to the position shown in Fig. 8.

The foregoing describes a construction embodying the invention which broadly comprehends a tool in which there is provided an anchor and packer assembly and which is so constructed that the tubing string to which the device is attached may be rotated after the packer has been set, whereby the numerous advantages of the invention are realized.

. prising a tubular body having a passage therethrough, an expander surrounding the body, a spring cage surrounding the body and releasably connected thereto, said cage including members adapted to engage cylindrical walls surrounding the tool and to'resist movement of the cage relative to said walls, slips attached to the cage and movable radially outwardly upon relative longitudinal movement of the expander and cage, a packer surrounding the body below said expander and athrust bearing between the lower end of the body and the packer whereby the tubular body may be rotated when the spring cage is released therefrom.

2. In a well tool of the class described, the

combination of a cylindrical member, an anchor and packer assembly surrounding said member, said assembly including means for frictionally engaging cylindrical walls surrounding the tool, slips attached to said means, a packer below said slips, means for expanding said slips when said member is moved upwardly to expand the packer, and thrust bearing means between the member and the lower end of said packer.

- 3. In a well tool of the class described a cylindrical body, an expander member surrounding the body and movable relative thereto, a plurality of slips engageable by said expander member and movable outwardly to engagement with surrounding cylindrical walls, said expander member having a concavity at one end thereof,,and a packer sleeve of expansible material having an end adapted to fit within said concavity, there being an opening in the body adjacent said concavity whereby fluid pressure within the body will move the expander member and effect initial setting ofthe slips.

4. In a well tool of the class described a cylindrical body, an expander member movably surrounding the body, said member having a cylindrical concavity in one end thereof, slips adapted to move outwardly upon the surface of the expander, a packer surrounding said cylindrical body and including a cylindrical surface fitting within said concavity, and a passage in said body for admitting fluid pressure from within the body to the interior of the concavity to move the expander.

5. In a well tool, the combination of a cylindrical member, an expander slidably surrounding said member and having an inwardly tapering peripheral surface thereon, a slip assembly including a plurality of slips adapted to ride upon the tapering surface and engage a cylindrical surrounding surface whereby the assembly is anchored to the surrounding surface; a packer ring rotatably mounted upon the member in opposed relation with the expander, an expansible packer surrounding the member between the expander and the ring, and a thrust bearing between the said cylindrical member and said packer ring whereby said member may be rotated relative to the packer.

6., In a well tool the combination of a cylindrical member, an expander slidable thereon, a slip assembly including a plurality of slips adapted to ride upon the expander and engage an adjacent coaxial surface when the member is moved axially thereof, an annular collar attached to said member, a packer ring surrounding, the member adjacent said colir, a thrust bearing between the ring and collanand an expansibie packer surrounding .the member berounding the tool when the string and mandrel are moved axially of a well bore, a releasable connection between the assembly and mandrel, a packer ring rotatablymounted upon the mandrel in opposed relation with the expander. and a a packer surrounding the mandrel between said member and ring to be expanded by relative movementtherebetween, whereby the string and mandrel may be rotated after the packer is set to seal betweenthe mandrel and the surrounding pipe.

BOB YOUNG.

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