US1794864A - Rotary trip spear - Google Patents

Description

March 3, 1931.

O. D. NUTTER ROTARY TRIP SPEAR 1 Original Filed June 6, 1928 Jay fimmm Invpni'or:

0mm Afluzz'er,

Patented Mar. 3,1931

PATENT OFFICE.

(mini 1). NUTTER, or IPARKERSBURG, 'wns'r VIRGINIA, ,ASSI'GNOR To ACME FISHING TOOL 00., or PARKER-sevens, WEST vrnsmra, a ooR-roaA'rIon or WEST VIRGINIA ROTARY TRIP, gra ls A ear-sna e ;runee,"1s2s,seria1 No. assess; Renewed. August a 1930..

Mypresent invention relates to a rotary trip spear as used for pulling casing sections from a well by engagement with the inside thereof. g

of a spear of the above type,- having a head adapted to be attached to a tool string, said head carrying a body, both of these elements being provided with an axial bore so as not to stop the-flow" of slush fluid into and out ofthehole.

Y The-upperportion of the body is provided with enlargedangular slip seats engagedby a plurality of'slips having toothed exterior. faces adapted to engage the interior periphcry of the casing being pulled. The rear face of thefslips and the seat on. the body have the same angularityin'order'that the toothed v face of the slip may always be presentedparjaoallel -to the innertace of the casing- Each slip is retained in place at its top by an overhanging bell portion of the head, and at its bottomby a retainer rotatably carried on a 1 trip sleeve mounted on the body.

gitudinal' and rotary movement in relation to" thebjody, this movement being'limited by a bayonet joint betweenthe parts;

Surrounding thelower portion of the-trip sleeve, is "a frictionspring assembly ofthe basket type merely held against displacementat the top by the slip retainer; and at the bottom by a cone not on thebott'om' 0t the body.

lowercollars with strip spring elements "therebetween and rigid adjusting screws constring.

-'iiecting the two collars. Movement of the collars toward each other under action of the screw members cause the spring strips to be bowed outwardly and. thus grip the casing section-with increased friction, or within limfrom top to bottom.

The invention further consists ofthe novel arrangement, combination and construction. .50 of parts more fully described hereinafter and The invention contemplates the provision The trip sleeve is capable of restricted lon- The, spring assembly comprises upper and duced extension 11 which is located between the bell'6 of the head and thebo'dy-S; ;-A

'shown in the accompanying drawings, in

WlllCh! W 1 1g. 1 is an elevation of the spear Wlllll the slips disengaged. .Fig ,2 is a similar view showing the slips engaging the'casing. p Referring now to the'embodiment illustrated, I have shownthe head at 1, having a truncated threaded cone 2by means of which attachment mayrbemade to the tool string or rotary tool joint ('not' shown);

Threaded to the hejad l'is'an elongated body 3 threaded to the head as at 4c andkeyed at 5. The lower portion of the head 1 is provided withan overhanging bell 6 form- :ing a space between it and the body 3 to. holdthe upper portion ofslips as will be more fully hereinafterdescribed.

Belowthe head, he bodye'nlarges angularlyto ii'orm slip seats adapted to receive the rear face of a plurality of slips'7. :7 The angularity ofthe slip seat and rear face of of. the slip is the same-so that downward movement of the slip causes the same to move outward uniformly. 1 I

- That portion of the body. forming the slip seats'is broken by elements 8 located between slips and engaging the side walls thereof. These members effectively prevent rotation of the slips about'the' body.

The outer face of each slipas shown is grooved or toothed in two directions as at 9 and 10, but is'not limited to this construction. This configuration prevents the movement of the slip in relation'to the casing section, and permits unscrewing of the casing. in the well by using the spear or aloft handed drill The upper portion of the slip? basa t e somewhat similar'lower extension 12 is provided which is located between the body 3 and an upwardly extending wall .13 of a slip retainer 1 1.- The retainer 14 projects beneath an undercut shoulder of the body as at 15 and carries 5 a member 16 threaded to the part 14 which in turn engages beneath a flange 17 in, the trip sleeve 18. Betweenthe bottom "ofthe;

fee

part 14 and the top of the sleeve 18, ball bearings 19 are held so that the slip retainer assembly is secured to the trip sleeve yet capable of ball bearing rotation thereon.

The sleeve 18 is capable of limitcd'rotary and longitudinal movement in relation to the body 3 due to the provision of a screw 20 riding in a slot having legs 21 and 22.

It w ll be obv ousthat as ,longasthescrew 2.0 .occupies the ,leg22 of the slot, there can be no longitudinal movement between body 3 and trip sleeve 18. WVhen however thebody is slightly rotated so that the screw 20 may occupy leg 21 of the slot, thebody; maybe moved upwardly in relation to the sleeve.

' Thisseparates the bellG of the head 1 and the part 14 of the slip retainer assembly. The angular wall of the slip seats-on the body, thus pushes the slipsoutwardlyagainst the interior 'taceof thecasing section, the teeth of the slips biting thereinto.

:Located' beneath theslip retainer assembly and surrounding the trip sleeve is a friction springmechanism of the basket: type. Tins mechanism comprises an upper collar 23, a

, lower collar-2e joined by screw members25 by means of which the collars maybe made to move toward and :away from each other. SSCUI'QCl'tO the collars 23 and- 2 l are strip springs 26 which are bowed to any desired eXtentbyadj-ustment ot-thescrews 25. :The

entire spring assembly is :freely rotatable about the sleeve-'18 and rests. upon a cone nut "27 screwed: into the 'bottomof the bodyi3.

An axial bore 28 passes completely through the entire device from threaded cone "2- to cone nut '27 so that 1 the flow of slush :liuid into'and out of the well-will not be prevented;

In operation, the friction spring assembly is so adjusted as to engage the casingto such adegree-that the weight ofthe-spear will be supported by this vfrictionalcontact'be tween spring and easing. The-screw 20 occupies the leg 220i theslot. The toolvis'now lowered intOthe-Well, the rounded nose of the cone-nut guiding the spear into the easing to be drawn.

As soon as the spring assei bly engages the casing, further lowering of -.'the spear,

causes the body and attached parts to move downward without the spring; -As .a consequence of this action, thespringassembly en gages the shoulder 17a of the trip sleeve, and dueto the factthat thisshoulder projects slightly below the bottom of the slip retainer assembly, the upper collar'23 is spaced from the slip retainer and-the entire weight of the tool string is carried upon the friction spring assembly. Above this assembly; however, there is the ball bearing joint =.so that the spear body and associated parts may rotate freely within the basket spring.

The spear may be forced down howev-er, into the casing until-theslips-tare at the de sired location.

Clockwise movement of the spear head will now cause the screw 20 to leave the leg 22 of the slot and pass into leg 21.

Upward movement of the spear then causes the slip seats in the body to force the slips out against the casing section, andithetoothed surfaces of theformerfbite into=the latter.

. The casing may thereupon be withdrawn.

ltinlued until the screw :20,.is at. the bottom of the leg21 in the slot.

rCou-nter clockwise,movement of the spear body. places thcscreiv in the slot 22 and thus locks the slipsv in their disengaged position, :thus pemnittingi the withdrawal. of thespear from the casing. The spear can-be madeto engage. or release the casing-at "willlat' any desired. ;p0ii1twithin-{the casingsand without awithdrawing'the spear to reset it.

aT-he extent of; thenthreads of the cone nut .27 is such that when "the, lconenutl is entirely in. pl,ace,-'the,slip, retainer .and trip sleeve can- ,not beqlowered far enough to completely .realeasetfhe endsqof the, slips. Thnsbyakeeping :the cone.nut "27 in. place as ;by .pin-29,it.is

impossible :to lose a slipiin the hole.

I claim:

-,-1. Atrip-spearcomprising .a head and a body, a series :otslips engageable with the 1' body, a-slip; retainer 1 carriedby a: trip sleeve,

;and=,a;frict1on spring for carrying "the weight of i the spear li-n-ra casing, the retainer being freely rotatable relative to the slips.

f 52., A :trip.spear comprising-a body, a series of ,slips engaging the body, a slip retainer freely:-r0tatable about the body, a tripsleeve ,carried by the ,body, the .sleeveland retainer engagingieach-other-in a ball bearing joint and spring means to prevent rotation of the trip sleeve relative -.to-.the body.

tripspear comprisinga body, aseries of slips engaging (the body, aslip ,retainer .and .a--.trip sleeve carriedby the body, vagflex- .ible friction springcarried by the. sleeve to support -the weight: ofethe. spear in-a casing .and means to vary the vflexure 0f-. the spring. 14:. Atrip spearwcomprising ahead .and a -;body, :a series of slips underlying w the head andengaging the body, arslip retainernnderlying a ashouldenaoncthe bod-y, a "trip sleeve engaging; the. retainer, flball.liearings'ibetaveen the sleeve and the retainer,-affr1ction;.spring assemblyisurrounding-thesleeve valid under- "al ying thesame to supportvthe meight :of aa ispearzin a casing. f: 7

5. A trip spear comprising a head and a body, a series of slipsunderlying the head and engaging the body, a slip retainer freely rotatable about the body, a trip sleeve carried by the body, the sleeve and retainer engaging each other in a ball bearing joint, and means for preventing rotation of the slips on the body and spring means to prevent ro-' tation of the trip sleeve relative to the body. 6. A trip spear comprising a head and a body, a series of slips underlying the head and enga ing the body, a slip retainer freely rotatabde about the body, a trip sleeve carried by the body, the sleeve and retainer engaging each other in'a ball bearing joint, and means for spacingthe slips apart in the body and spring means to prevent rotation of the trip sleeverelative to the body.

7. A trip spear comprising a body, slips thereon, means to retain the slips about the body, means to trip the slips into inoperative 7 joint between the trip means and the slip retaining means. 7

In testimony whereof, I aflix my'sign'ature.

ORDA D. NUTTER.

position, and a swivel

Images