US2695067A - Open hole hook wall packer - Google Patents

Description

Nov. 23, 1954 s n- ETAL 2,695,067

OPEN HOLE HOOK WALL PACKER Filed June 6, 1952 3 Sheets-Sheet 2 a 1, wm e \I 4 W w N I. r m E 0 p il N M F HM N AEF m mm M 5 .2 5 f $4 5 4 M. 2 M W 5 0 5 I 97 a 4 8 w f m L w /A W I a. a 9% 9 M, G 5 E m m 8 2 m a 6 W m m C mm E [:1 A-/ A42 g5 A if all [3| 0 El rlzl /F v-\\A .J n m a I) United States Patent 6) ,6 OPEN HOLE HGOK WAL PACKER Joseph-D: Smith; Slire'veport'yha 'a'n'd William B:-T aylor,

Houston, Tex, as'signors' to Johnston Testers- Inc;

Houston, Tex., a corporation of Delaware Application June 6,1952, SerialiN'o: 292,068 4 Claims. 2). 165-438),

Thisinvention relates. to an open liole packer.

A main object-of thepresent invention .is-toprovidean improved open hole hook wall-packer.

provide such .a packer retained against outward cammed outwardly into the well bore by proper telescopic movement of expansion of the packer sleeve.

A further object of the .presentrinvention is tOgP I'OVldG a packer as above described which can.be easily set inan open hole and then collapse'and then;readilyrersetvin another location.

Various otherobjects of th'e; present;inventionrwill be apparent'from the following clescription 'talten in conjunc-a tion' wi th the accompanyingpdrawings wherein;

Figs- 1a and 1bv disclosein; elevationa packer-em.- bod'ying. the concepts of the the upper portion of the packer in mid-section, the parts being depicted in running in condition.

Figs. 2a and2b' are views similar .toFigs. 1a and 1b, respectively, butshowing the packer after the dogs have been hooked into the Walls of the wellbore.

Figs; 3aand 3b are views similanto-Figs. la iand lb,

respectively, but showing the subsequentistage of opera- 5 tiori where the expandable sleeve has-,-been -'expan'detlki'n'to engagementwith the walls engage the same.

Figs. 4 and 5 are fragmentary views. showing iho'wthev cam edge on the spring sleeve functionsto rotate' thef sleeve during. unsetting of the packer.-

Referring to the accompanying drawings wherein similar reference characters designate similar parts throughout, the packer there disclosed comprises an upper composite tubular mandrel 11 upper end to the lower end of a drill string 13, and slidably receiving within its lower portion the upper end of a lower composite tubular mandrel 15. Threadedly connected to the lower end of lower mandrel 15 is an oil well tool generally entitled 16 of any desired type, such as, for instance, a formation fluid tester. The packer functions to sealingly engage the walls of a well bore and separate the fluid above the packer from the fluid and operations taking place below the packer, or conversely separating the fluid below the packer from the fluid and operations taking place above the packer.

The upper end of lower mandrel 15 is keyed to mandrel 11 by keys 17, and carries a nut 19 which normally rests on a shoulder 21 provided on upper mandrel 11 when the packer is being run into or out of a well. Also formed on mandrel 11 is a shoulder 23 for limiting upward movement of lower mandrel 15 relative to the upper mandrel.

Suspended from upper mandrel 11 by a flanged split ring 25 is a resilient packer sleeve 27, which is connected to said split ring 25 by a perforated band 29, the latter being partially embedded in the upper end of the sleeve as is apparent from the drawings. Band 29 and split ring 25 are connected together by inter-engaging flanges formed on the band and ring as disclosed in the drawings, and said split ring and upper mandrel 11 presentinvention, showingv of thezwell bore to sealinglys.

threadedly connected at its V. are likewise connectedby inter-engaging flanges formed on; the ring: and upper mandrel. Sleeve 27 is con;

nected at its lower end-to v-lower mandrel 15 by a similar,

band'31 and a similar split-ring ,33. Split rings Hand 33 are held together by bolts 25a and 33arespectively; the packer sleeve 27 is posi- By theabove construction, tively connected to the lower and upper mandrels to enable positive control over its movements.

It, is apparent that when lower mandrel 15 is held stationary in the well,- in a manner to be presently explained, sleeve 27 may be expanded into engagement withtth e. Walls of the well bore by a downward move: mentof drill string 13, which causes a consequent down-- wardf sliding movement of upper mandrel 11 along lower mandrel 15'to expand saidsleeve.

For hookinglower mandrel 1 5 to the walls'of the well bore, said mandrel is provided with an enlarged portion; 34 having pivotally mounted thereon a plurality of? dogs 35 by means of pivot mounted for outward swinging ment with the walls of the well constrained to assume inward springsr39 saiddogs.

In their inwardpositions, dogs 35 bear against the upper-taperedend of a springsleeve 41, which is slidably mounted on the lower reduced end 38* of lower mandrel 15-. ,Sleeve- 41 carries a plurality of bowed springs; 43 adapted for frictional engagement with the walls of the well bore. v

Formedin sl'eeye;41 -isan inverted J; slot 45 accommovement into engagebore, but normally being modating'a screw 47 which is threaded into lower mandrel 15 J slot..45; is in part defined byan inclined cam edge 49 adapted to be; engaged by screw- 47 ismovedupwardly-alongthe, long =sideof slot 47, upon an. upward movement of-lower' mandrel 15 relative, to sleeve 41,-to turn sleeve. 41 and" dispose the screw in the; shorter side of the- J; slot to condition thepacker for further downwardor upward movement inthe well;

In operation-the packer is lowered into the well in the condition-shown, in Figs. 1a; andylb until the packer is located approximately; at thezone-which'it is desired tof set the same. Thedrillstringvisthen' slightly raised to lift screw 47 upwardly a slight amount and the drill string turned in a direction todispose the screw in the long side of the J slot while the sleeve 41 is held-againstmovement by; frictional members 43 engaging the bore wall. Thereafter, upon subsequent lowering movement of -the drill, string, springs,43, being in frictional-engagement with-.the walls of the wellbore, will prevent; downwardmovementof sleeve 41 so-that the dogs '35 are cammed outwardly by'the upper tapered end 40 of relatively stationary sleeve 41 into hooking engagement with the walls of the well bore. This stage of operation is disclosed in Figs. 2a and 2b where it Will be noted that sleeve 27 is only slightly expanded at this time.

When the dogs take hold, lower mandrel 15 is held stationary so that upon further downward movement of the drill string, upper mandrel 11 moves downwardly relative to the now stationary lower mandrel 15 to compress sleeve 27 and cause outward expansion thereof into sealing engagement with the well bore Walls. Shoulder 23 serves to limit downward movement of upper mandrel 11 relative to lower mandrel 15 to prevent damage to the packer by undue compression thereof.

The particular operations or tests to be performed are now commenced. After completion of such tests, when it is desired to collapse the packer, an upward pull on the upper mandrel 11 serves to collapse sleeve 27, and when nut 19 engages shoulder 21, lower mandrel 15 is lifted to lift the dogs 35 out of hooking engagement with the walls of the well bore and away from (but not out of contact with) the tapered end of sleeve 41 to allow the dogs to assume inoperative positions under the influence of springs 37. During upward movement of lower mandrel 15 relative to sleeve 41, screw 47 comes into engagement with cam edge 49 as shown in Fig. 4 so that the sleeve is rotatably cammed around to dispose the screw into the short side of the J slot as shown in Fig. 5. Thereafter, the drill string may be lowered or raised to dispose the packer at a new location, at which pins 37, said dogs being positions by leaf or strip? secured to enlarged portion 34' and engaging the packer can be set again by a repetition of the operation above described.

By the present invention, an improved open hole hook wall packer has been provided which can be readily set in a well bore to seal off the zone above the packer from the zone below the packer, and thereafter readily collapse and reset when and where desired.

While we have shown the preferred form of our invention, it is to be understood that various changes can be made in its construction by those skilled in out 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. A device of the class scopically arranged upper and lower mandrels adapted to be suspended from expandable packer sleeve arranged to be expanded upon contracting telescopic movement of the mandrels, well bore wall penetrating means on holding said lower mandrel stationary to permit contracting telescopic movement of the mandrels comprising pointed dogs pivoted at their upper ends to said lower mandrel, spring means fastened to said lower mandrel and engaging said dogs for retaining said dogs in an inefiective position, and means for moving said penetrating means to an effective position against the resistance of the restraining means, said last-mentioned means comprising a cam sleeve slidably mounted on said lower mandrel and meanson said sleeve for frictionally en- 3- gaging the bore wall.

2. A device of the class described, comprising an upper mandrel having means for connection to a string of drill pipe and telescopically receiving the upper end of a lower mandrel, an expandable packer sleeve secured at its ends to the upper and lower mandrels and adapted to be expanded upon contracting telescopic movement of the mandrels, well bore wall penetrating means on the lower mandrel for tionary to permit contracting telescopic movement of the mandrels comprising pointed dogs pivoted at their upper ends to said lower mandrel, spring means fastened to said lower mandrel and engaging said dogs for retaining said'dogs in an ineflective position, and means for moving said penetrating means to an effective position against the resistance of the restraining means, said last-mentioned means comprising a cam sleeve slidably mounted a on said lower mandrel and means on said sleeve for frictionally engaging the bore wall.

3 Adevice of the class described, comprising an upper mandrel having means connection'to a string of drillpipe and telescopically receiving the upper end of a lower mandrel,-an expandable packer sleeve secured at its opposite ends to the upper and lower mandrels and adapted to be expanded uponthe art withdescribed, comprising telea string of drill pipe and carrying anthe lower mandrel for holding said lower mandrel staon the upper end thereof for contracting telescopic movement of the mandrels, a plurality of "pointed dogs swingingly mounted on the lower mandrel, a sleeve slidably mounted on said lower mandrel below said dogs having means for frictional engagement with the walls of a well bore and having a camming portion at its upper end for camming the dogs outwardly into engagement with the walls of the well bore, said sleeve having formed therein an inverted J slot, and a pin on the lower mandrel disposed in said slot in the shorter leg thereof to restrain said sleeve against movement camming said dogs outwardly into engagement with the walls of the well bore, whereby when said tool is turned relative to said sleeve said pin is moved into the longer leg of said J slot and then may be moved downwardly relative to said sleeve to cam said dogs outwardly into engagement with the walls of the well bore. 4. A device of the class described, comprising an upper mandrel having means on the upper end thereof for connection to a stringof drill pipe and telescopically receiving the upper end of a lower mandrel, an expandable packer sleeve secured at its opposite ends to the upper and lowermandrels and adapted to be expanded upon contracting telescopic movement of the mandrels, a plurality of pointed dogs swingingly mounted on the lower mandrel, a sleeve slidably mounted on said lower mandrel below said dogs having means for frictional engagement with the walls of a well bore and having a cammlng portion at its upper end for camming the dogs outwardly into engagement with the walls of the well bore, said sleeve having formed vtherein an inverted J slot, a pin on the lower mandrel disposed in said slot in the shorter leg thereof to restrain said sleeve against movement camming said dogs outwardly into engagement withthe walls of the well bore, whereby when said tool is turned relative to said sleeve said pin is moved into the longer leg of said J slot and then may be moved downwardly relative to said sleeve to cam said dogs outwardly into engagement with the walls of the well bore, and a cam defining part of the J slot engageable with said pin when the pin is moved upwardly within the long side of the J slot-to cam said sleeve around to dispose the pin within the short side of said J slot.

References Cited inthe file of this patent H UNITEDSTATES PATENTS Number Pranger May 30, 1939

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