US1175911A - Underreamer for oil-wells and the like. - Google Patents

Description

` i l 'VL IVI. LEWIS, D'ECD. A.,LEW|S. ADMINISTRATRIX.

UNDERREAMER FOR o|L WELLS AND THE LIKE.

- APPLICATION FILED FEB. 26, |915. 1

` Patented Mar. 14, 1916.

Torvllughomfitmay cocerm t y i u Be it` knownthat LMoBoANldEWrs, a citizenlogtheiUnited States, residing at Sawtelle; i" "theounty ofLos Angeles and State a ernia,- `have vented anew and use k yUnderreamers,for Oily vvhich the `:following is aspeeicatingf i r l n v My invention; relatesjsto Well drilling tools nd hasorits object the provision of an `under'eanieralapted to befinserted in the `reaming` out the hole below the lower end of i 'the casngito permit thecasing to be lowered inthe Well from time `totiine as thedrill-ing progresses;` i Il am awarelthatpatents have een granted* upon` devices 1 `for this purpose ndl that rthe articles are now in :commercial seybut-theprimary object'of my device is o`ji1nprovethe`l method `of reaniing` out the ellyholesywith" the provision of a device ca vpabley of .heavy duty and absolutely positive ation.` "Asource offtroubleinsome of` the ell lmowhftypesfo'f reainers" consists in the `1 ailureof the springs"by` which `they are eld `in tensionk when in use to `guarantee a uttersp and further, inasmuch as `most `of he` Well knovvn types are `very complicated, 1 a `great dealfof? trouble is encountered in their peratiompthus causing delays',` in the work `and 1 In little` Yahnoyance 1 to'` "the operators. tothe above` `features vthe Work 'sinot g rally-#perfoined in a proper or `L satisfabtory mannenfand itjrllis thefobject of Kmypresent inventiontoprovide a tool free "lironiftheobjectionable features `above noted land capable of constant and `satisfactory vork under 'all conditionsJ r jmOther'f obj eetsinayappear f in `the descrip- "qtionfolloyvingil v i L Referring to"` the drawings in? which simi- Alar characters of reference indicate the vsaine parts throughout theseveralwig'ures, `Figure lvifsan-` elevation of reanier,`partly shown in section in positionin a Wellicasing; Fig. 2 `is asectional `.el i1 fthe` saine with )the cuttersiexpanded` an the" tool body and casing insection; Figs 3 is arsectional ele- 1 vation oFig. 2 at rightangles thereto; Eig.

41 sy a seotional'plan'on the line 141-4,- Figg `2 y Eig.k is f a sectional plan' on y the.- line Torf-f5', l Figr2; Fig pisalview; of avvrenchfor con aftracting the cutters `#when y lower therein the"1psasirig` v V p Specification `of Letters Patent. `Laimitation med February aa, 1915. serial No. 12,223.

ellvvthroughfthe driyeipipefor casing for` roper and ,reliable action atfall times of the Ti-ED 4s'rafrus raranfr oratori;

onsan'ipnws, or savv'rELnE, aannemers; ANN Lewis anrerms'rnarsarx or sain t i. y l nonGANLEWIsnnonasEn l -l oir-WELLS .aun THE um. il

rammed Maa-1a. tera `The exterior of the tool body 1 is of the4 usual forni but the lower end. thereof has a socket 2 *lorrned therein, extending upwardly for a convenient distance and a pocket 3 lis formed in 'the upper end of the socket. A pair of cutters e and 5, exactly alike in form and function5 have the stems 6 and 7 extending upwardly in the socket 2 of the body and the'cutters 8 and 9 at their lower ende` The forni of the cutters is best shown in Fig. il. The cutters arepivotally mounted on a holt 10 having a head 11 and a square nut 12 on the opposite end from y the head, and this bolt is slidable vertically in the body 1 by means of slots 13 which are countersunk to receive the head and nut of the bolt. The cutting portions Sand 9 of the cutters 4 and `5 are of semifcircular cross `section and conform to the periphery of the body 1, shoulders lll and 15 being provided 75 below the end of the body and the steine `6 and 7 being tapered from the approximate size ofthe socket 2 on the axial lineto the upper ends in order to provide sufficient clearance for the free movement of the stems 8o When-the cutting ends are contracted as l showniu Fig. 1 Diagonal grooves 16 and 1'( are formed in the side of the stems G and `'in Whichfis placed the ends 18 and 19 o the spring 20, the central portion oiE this spring being bent around the bolt l0 and the lo\ver,ends oit the grooves conforming `to the shape of the spring. up

The spring 20 serves 'to hold 'the upper ends of the Sterns in contact and? the cutting ends expanded and when the cutting ends rest upon the bottoniv of the Well orany firm surface, lthe upper ends of the stems are forced upwardly into the pocket 3 at the end oi `the socket 2, where they will reinain irmiy locked in position until the pressure on the body is released or until the cutters are pulled outwardly `troni the socket. The Ystroke orv the body in the realning operation forces the shoulders 14 and 15 against the lower end of the body and thus presents an unyielding surface to take the shock of the stroke. a When the tool is Vto be inserted in the 'casing for the purpose of reaxning out the hole, the forni of Wrench shown in Fig. 6, orlany other suitable forni may be used to casing, the ring 'portion' 21 of the Wrench `loelng forced dowuvvardly` over 'the body 1 110 I and over the cutters by grasping thehandle 22, and the cutters placed in the upper end .of the casing, Where they may be lowered in the casing in the usual manner. As

'5 shown in Fig..1when the tool is in the casing, the lower ends of the cutters frictionally engage the Wall of the casing 23 .until the botto-m thereof has been reached,

When they will automatically expand to the 4 limit of their movement, in which case the distance across the cutting points Will ex- -ceed slightly the diameter lof the casing, so wthat the latter may be easily lou-'ered into the ho-le thus produc/ed. A l

In order to contract the cutters, it is necessary that the upper ends be Withdrawn from the' pocket 3, and this is accomplished by the movement of the cutters downwardly y in the pocket 2 which is permitted by the movement of the bolts 10 in the slots 13, the upper ends'of the cutters in such case assuming positions against. the Walls of the.

. pocket 2, as shown in Fig. l. l It frequently occurs, When the'reame'r is "being inserted in the casing that the cutters 8 .and 9 which are contracted and frictionally engage the Wall of the casing in their descent inthe Well, will slightly expand beyond the inner Wall of the casing at a joint and stick against the upper Aend of a casing section. In order to prevent suchan occur- `rence in the use of my device, I therefore p provide grooves 24 on the rounded outer portions of the-,cutters 9 and 10, in which before the tool is inserted in the casing, a -Wire 25 may be placed and twisted one 0r more` turns at the ends to hold the cutter points contracted sufliciently so that ythey may not touch `the end of the casing as described. This Wire will not in anyway prevent or hinder the tool being lowered in'v the casing and when the bottom of the Well is reached one or two strokes of the too-l will suliciently expand-the cutters to breakthe Wire and render the cutters ready for service,

`i and the cutters l and vfItis to be observed that my device con-Y the body 'l sists o'f only three main parts,

5, and the latter may be readily removed from .the body for the purpose ofy sharpening by turning the bolt 10 with a screwdriver and thus releasing it from the nut 12 Whichis held from turning by' making the counters'unk portion of the 'slot in which it is 'seated square as shown. l

lstructure of my invention, that a thoroughly practical and positive reamer is hereby providedwthe device is free l.from small and delicate parts, the structure of the' entire mechanism .is massive and vcapable of the lIt is lobvious from the considerationv ofthe 'foregoing descriptiony of the operation and'- `heaviest duty, the absence of Asprings to accomplishl the drilling enhances its efficiency, and a great economy may be effected byits use.

Having thus'described my invention, what I claim as new and desire Letters Patentl i for, is1- 1. An underreamer for oil Weils and the -likeincluding an integral recessed tool body having a pocket at theupper end thereof, a

pair ofexpansible cutters movable pivotally-and slidably therewithin on a common axis, andlperipheral springs seated in and extending around the axis o-f the cutters for holding the cutters normally-expanded beyond the peripheral line of the Well casing,

fthe upper ends of the cutters being seated in said pocket when thecuttei's are so ex?v panded.

2. An underreamerfor oil` Wells andthe like including an integral recessed' tool body having a pair of commonly held cutters Within and movable longitudinally and p1votally in the body together with their aXis and means in the periphery ofthe cutters midway of their length for holding the cut ters normally expanded and Vmeans Withinthe body for locking the cutters in their. expanded relation.

, 3. An underreamer for oil Wells and the like including an integral tool body having a socket' therewithin and a pocket at the end of the socket, a pairl of cutters movable pivotally on a common aras and longitudinally in the body with their axis, 'the stems of the cutters extending into and seating in said pocket and the cutters vextending below the body, and common means carried by and seated in the periphery of said cutters for' holding the cutters normally expanded.

f '4. An underreamer for oil Wells and the ter axes at the center and extending diagonallyV of lthe cutters and upwardly into the socket seated in said cutters for holding the cutters normally expanded beyond the peripheral line of the Well casing, saidy stems being adapted to seat yin vsaid pocket forv locking the cutters in 'their`z expanded state,v

MORGAN LEWIS. Witnesses: .Y 1

Annie HARTENsmIN, 'Y LUTHER L. MACK.

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