US1153811A - Drive-shoe. - Google Patents

Description

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reame? Ww sho?a 5 teet Ath,d speci ce is i0 furled 1n 'YU Y,

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reemer is employedin connection with the shoe. Thus the teeth 18 are fully-protected frein' the blows of the under-remner bits. lt will be observed that 'come of the cut-4 '5 ters in the ,lowermost .convolution of the spiral series, 'es seen at 14?, ere iforrned jointly with the ediecent fece teeth 18a. will be noted eiser( Figs. l and-$5)I that the first ree-ming cutter Mb tiene lower end of the'spirel series, together with the adje,- eent face-tooth 1S", res t in e'plowshere formation on the edv-ence cutting element, the scid tooth b being continued across the nent adjacent notcli lo.

f The provision otspirel roaming elements on; theexte'rior sidesurirece of the shoe remlts'inigving. u'- turning movement to the whole. 'string or cesin sections in spudding or' letting the casing down on the bottom'oi-the drill hole. A. furtlier advantage ettending the spiral elements es comp-,tred y '.fvith the ordinary bell slice, is that the life Jef the shoe is prolonged in proportion to the "numEer of c mvolutions,` since the 4first convoluion will weer rst by reason of beering the brunt of the cutting action, the secl ond convolution being` then subjected to the greatest Wear, und so on. Approximately three convolutions are preferred. The spirai rib presenting more or less of o convolgtion of unbroken continuity will, in oddition to sustaining its proper proportion or weer, serve to cleer the hole of any projections left by the seperate cutters 14.

By the described construction the drive Shoe will in many ceses, sul'lice to produce the necessery'reeming action to accommodate the'cesing end its collars, etc., Without the employment of en" under-reculer.

4The lateral cutters er'enged in e. spiral series es described, it will be seen, results in eA progressive cutting action liy the succes sive cutters in e convolution, considering;

a turning movement of the tool through u, given annuler zone, the cutters serving; to successively cut portions in the given of action.

The formation of the lateral teeth with interdentel spaces gives the series of teeth the forni of e broken squere thread, the opposed walls of the two adjacent teeth being formed by the side Wells of en intervening space and the teeth on the 'Front fece merging into the forward teeth of the spiral, 55 The result obtained is that the teeth uct as 4* teaming cutters distinguished from. -oro ducing' a. mere breaching action. Again, the spiral series of teeth, defined by the in terdental spaces to present e broken square thread, result in cutters having pronounced. forward cutting action, but c negative rake for reverse. Als0,`the very important result is obtained, that tileV casing is automatically rotated Within certain limits, giving e ri-' 11mgefect- Fuftherrnore, the shoe Wil have ,err

`on en earth Well e plestering eect Aso that the well will stond up better.

Hoving thus described my invention, l

claim es new, and desire to secure by Letm Vters Patent:

l. A drive shoe. for Well casings having reeming cutters on the outer side thereof,

the cutting edges of which are spirally dis! lposed.

outer side thereof, and s spiral groove, the I convolutions of which alternate with the.

convolutions of the roaming cutters, there being spaces alternating with the cutters and intersecting the said groove.

4. A drive slice for Well cusings, having on the front iace en annular series of cutting teeth seperated by intervening spaces, and on the outer side having lateral reeming cutters, the seid roaming cutters disposed in the form of e spiral series, the said front teeth merging into the forward teeth of the spiral. series.

5. A drive shoe for Well cesings, having on the front fece thereof en annularseries of cutting teeth, and e plane seat radially inv/:1rd from the cutting' teeth adopted' to scot; under-reemcr elements.

6. A drive shoe for well cusings, having on the front fece thereof en annuler series oifr cutting teeth, and lute ul roaming cutters on the outer side of t'ne shoe, the said teeth und cutters presenting cutting edges form 'part of e cylindrical surface'.

7. A drive shoe for Well, casinos, lievi/'ing on the outer surface thereof e. spiral series being" l ice of reeining cutters beveled. on the outer surfeces, the lower 0it tlie several cutters forming part oi? e. cylindrical surface.

8. A. drive shoe 'for Well cesingsllie.ving ou the outer eide thereof an annuler" spiral series of separated resiningr cutters presenting e plurality ot convolutions, the cutters ci one convolution of tue spiriti series being in stugrgered relation to the cutters of en adjacent convolution oi seid series. I

9. drive slice for Well carvings, leaving on the outer side thereof u spiral series of seperate rceming cutters, and a' sbirel ril) continuous with the uppermost convolution of the series of cutters.

T10. A drive slice for Well cesings, having/1 on the outer thereof spiral series of reeming cutters, und un annuler series of cuttingl teeth ou the iront foce ci the slice, certain of said teeth being formed continu*- ous with certain of the cutters in the lovrerf most convolution of. the spiral series of cutters, Seid cutters en the front lieee of the lil@ mee

shoe terminating at their inner sides, outward from the here of the shoe.

1l. A drive shoe for well casings, having a spiral series o' roaming cutters ohliquely disposed on the outer side thereof separated by intervening spaces, and an annular series of cutting teeth on the front face of the shoe, one of the said teeth being formed in conjunction with the irst cutter in the lowermost convolution, and extending across the space between the two adjacent cutters in the next convolution.

12. A drive shoe for well casings, having a, spiral series of reaiuainr cutters on the outer side thereotl and a spiral groove, the convolutions of which alternate with the convolutions o the cutters7 and a spiral rib presenting a convolution continuous with the spiral series of cutters, the said groove being continued above the said ril).

13. A drive shoe for Well casings having lateral cutters on the outeifside thereof rearH ward of the front end, and a rib on the eX- terior surfaces above the said cutters, the rib and cutters presenting edges7 forming part oi' a cylindrical surface.

14; A drive shoe for vvell casing. having a toothed front cutting edge, lateral cutters on the outer side of the shoe rearward of the said front cutting edge, and a rib on the exterior surface above the said lateral cutters.

In testimony `whereof I have signed my name to this specification in the presence of two subscribing witnesses.

H. MEAD.

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