US1374540A - Well-tubing catcher - Google Patents

Description

R. A. WILSON., WELL TUBING CATCHER. ION FILED FEB.20, 1920. RENEWED FE Patented Apr. l2, 192], 2 ssssssssssss 2.

ROBERT A. WILSON, or miams, TEXAS, Assienoit 'ro rein amenacen consonaf 5";

TKION, OF DALLAS, TEXAS, A UCRPOTION @E DELAWARE.

WELL-TUBING eerenrsi` Application iled February 20, 1920, Serial No. 360,031-, Renewed February 24, 31921. Serial No; 447,551.

To all whom t may concern;

Be it knownthat I, ROBERT A. WILSON, a citizen of the United States,`residing at Dallas, in the county of Dallas and State of Texas, have invented certain newl and useful Improvements in l/Ve'll-Tubing Catchers, of which the following isa specifieation. vThis' invention relates to new and useful improvements in well tubing catchers.,

The invention has particularly but not necessarily to do with improvements uponv the device covered by Letters Patent' No.

f 1,218,549 issued tol S. A. Guiberson, Jr., on

Marcli 6, 1917. The improvement resides in providing an'equal and positive bearing surface for the gripper slips or dogs in all their adjusted positions.v

In the patented device .the slips ride up' and down on a conical surface. Tlieinner or bearing surface radius of each slip is constant while the radius of the conical. surface varies from a maximum at the upper end to a minimum at the lower'end. Consequently the bearing surface of the slip if made to conform tov the Varch of the head at one location, would not iit and bear evenly on said surface when adjusted. By reasonof this the 'strain must be sustained to a' large extent by the slips.

In carrying out the present invention the head is provided 'with inclined faces for the gripper slips, each face transversely curvilinear on a radius constant throughout its length. Each slipvhas its' inner face orsur'- face transversely' curvilinear Von the same radius whereby it bears evenly on the inclined surface of the corresponding faceV on the head and contacts over its entire surface at any of its adjustments. By such an arrangement an even distribution of the strain is had and is sustained by both the slip and the head substantially the same as if said head and slip were integral.

Other improved features willV be Vhereinafter more fully brought out.

The invention will be more readily understood from a reading of the following speciiication and by reference to the accompany ingl drawings in which an example of the invention is shown and wherein:

F igure 1 is a vertical sectional view of a woll casing showing 'therein a tubing catcher embodying my improvements,

` head, showing Fig. 2 is an elevation of the head and- Speciicaton of Letters Patent. Patented pii. l2, llilil... y

tubing. section, a portion of the head being in section and vshowing the collar and tubing cast therein, i

Fig. 3 is an enlarged. elevation of the clinecll bosses,l

4-'-4 of Fig. 2, and Fig. 5 is an underside view of the head.

Iii the drawings the numeral 10 desigthe face of one of the in-y Fig. 1 is a cross-sectional view of the line nates a wellcasing and 11 the section of the well tubing with which the catcher isv einl bodied. 12 is anupper section ofthe tubing and 13 is a lower section of the same. These .y three sections suiiiciently indicate the line of tubing which is of considerable. length and weight.-

The catcher includes a head 14 in which i a collar 15 and the upper end of the tubing section 11 are cast. The lower end of they; 1 upper section 12 is screwed into the collar.

15, and a collar 16 unites the lower end ofV the section 11 withv the lower section 13. Bv

sey

casting the collar 15, section 11 and the head Y together, the parts are made integral andv the head is thus better able to withstand the y i longitudinal thrust incident tothe operation l of the gripper. slips 17.`

I have shown three gripper slips or dogs. i

17 although the number .may vary, and each has the usual teeth 18 on its outer face.

The head is formed with a plurality of upvardly and outwardly inclined faces 19,

one for each slip. At the base of eacliface a lug 2() is provided'and each lug has its upper surface in the form of an inwardand outward bevel 21.- E'ach slip has its lower i` end 22 correspondingly beveled to fit the bevel 21. The slips are wedge-shaped and when inoperative rest on the lugs in which position their teeth 18' are within the dianieter of the head and lugs and therefore can-A l i .not engage or catch on the casina'.y

The

beveled faces 21 and 22 tend to guide the I slips inward as will be apparent.

The-very important feature of the invention is the curvilinear' surfaces or faces Each face is curvilinear transversely on the same radius throughout its entire lei'igth and the inner face of each slip is correspond-J ingrly curved, thus the entire inner face of a slip will Contact with its face on the head@l at any elevation to it is adiiisvtedj.y

ice'

The curvaturexgof the faces is' clearlyillustrated in Fig. '4, where it vwill be seen that "vided between the faces which also act as. Huid courses. ,The advantage of this strucr4mous strain and shock to which the slips must bra-subjected is considered. Each slip the center 'ci the arch becomes eccentric and the radius is constant. The. faces on the head are formed in rectangular panels so that the slips have an equal bearing at all elevations. Converging sumps 24 are proture will be appreciated when the enorcontacting throughout its entire area will be sustained by the head which will absorb the shock and will bear the strain. It will bey seen that in structures where the -slip does not contact along its sides with the head f, there is liability of the slip breaking or' cracking under uneven strains. y

A collar weight 25 is 'slidable on the section llbelow the head. Counter-sunk ears 26 in the upper edge of the collar weight receive the lower ends of links -27 which slide through enlarged. slots 28 in the lugs 20. Each link has its upper end pivoted 1n the bottom of la, slip- When the collar weight is displaced upward on the tubing i section 'the slips 17 are moved upward by the links 27. The collar weight is partly supported on a coiled spring 29 surrounding the section 11 and resting on the collar 16..

The spring is only partly compressed by the collar weight thereby preventing to a great extent the ordinary slight vibration of the spring, occasioned by stopping and starting t e tubing while lowering it into, and raisving it out of the well, and the vibrations caused in pumping, which vibrations in ordinary practice are sometimes suicient to cause the slips to move upwardly and into contact with the casing. n

lf the tubing should break the inertia of the collar weight 25, accentuated by the tendency of the spring to expand will cause said collar weight'to maintain its position. The head and tubing section, however, being attached to the line of tubing will tend'to descend more rapidly; consequently the. links 27 being sustained by the inert collar 'weight will support the slips 17 and the latter will be thro-wn outward by the inclined Afaces 23 when the head movesudownward.-

The teeth l18 bein sharp and hard will readily bite into tie casing 10 and hold against a further drop. It will be seen that the inner face of each slip 17 is at -all times in contact with the faces 23 and the slips are thus lirmly supported by the head. This makes a very substantial structure and reduces the liability of breaking`,fcracking and chipping to a minimum. l 'i The purpose of the beveled lugs and the lower ends o1c the slipsbeing beveled to fit is to hold the slips intofcontact with the faces o the head by means of the colla-r weight only part of its weight being sup-l ported by the coil spring.

The invention is not limited lto a tubing -catcher as 4the transverse curvilinear faces with a constant radius and slips with inner faces of the same radius could be used in other oil well and well drilling'tools.

Various modilications may b e made in the construction shown in the drawings and above particularly described, within the purview of my invention.

What l claim, is: i. A well tubing, catchercomprising, a head, havin longitudinally extending inclined portions," converging downwardly,

.each portion having a lace curved in cross arc having a radius,constant throughout the entire length of the slip, whereby the slip face closely lits the face of said, portion lthroughout its entire length and such close fitting is' permanently maintained during the operation of the device. A

'2. A" well tubing catcher comprising, a head having longitudinally` extending in# clined portions co. nvergi-ng downwardly,

.each portion having a face curved in cross section, said face being formed upon an arc having a constant radius throughout the entire length of the face, gripping slips eX- tending longitudinally of said portions, said slips having inner inclined faces converging downwardly, eachslip face being curved in cross section and formed upon an arc havinga radius constant .throughout the entire length of the slip, whereby the slip face closely lits .the face of said portion throughout its entire length and such close fitting is permanently maintained during the operation oie the device, andlineans to move the slips longitudinally' with relation to such ortions.

3, .n a device :ofthe character described, s

a tube section', -asleeve internally threaded to receive the end of the tube section', a head cast upon the sleeve and upper end of the tube 'section te be yrigidly connected therewith, said head having longitudinally extending inclined portionsconverging downwardly, said portions being' spaced to form longitudinal passages and each portion having face curved 1n cross section, said lace being' formed upon arc having a constant y radius throughout the entire length of the face, said head being provided at its lower -end with lugs` said lugs having openings formed tlieretl rough, links slidable Within the openings.J collar weight slidable upon the 'tube section. beneath the. lugs land pivotay aonnected 'with 'bhe nks, a spring surrounding n@ mbe secn and engaging the collar weight, and grinning slips extending longitudinally of said porins, said slips having inner nned faces cenverging downwardly, nach slip face being curved in cross section an@ ormad upon an are avng a raus constant hzoughout the antifa engh of the slip, whereby in@ slip face closely tsng is permanently -Inaillianed during ts th, face of said; portion` hroughout its entire .length and such closeA the operation of the device,v and an upper- RGBERT A. WILSON.

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