US1625247A - Collapsing oil drill - Google Patents

Description

April. 19, 1927.

B. B. DUDLEY ET AL COLLAPSING OIL DRILL Filed Aug 24, 1925 2 Sheets-Sheet 41 4 INVENToRs uoz fr Y 1,625,247 B. B. DUDLEY ET A1.

coLLAPsING 01;. DRILL April 19, 1927.

Filed Aug. 24. 1925 2 Sheets-Sheet 2 3 3J N 3 .a om M... a

abboznuj Patented Apr. 19, 1927.

UNIE STATFS PTENT FFEQE.

BENJAMIN B. DUDLEY, 0F VISALIA, AND EDWARD R. DUDLEY, OF PIEDMONT, CALIFORNIA.

COLLAPSING OIL DRILL.

Application med August 24, 1825. serial No. 52,238.

r1`his inv-ention relates to well drilling bits in general, but in particular to bits of the reciprocating type adapted for drilling a hole larger than the casing through which the bit works.

The principal objects ot the invention are to provide a drill bit of this kind, of extreme simplicity and ruggedness, and which with its associated parts will drill a straight hole and effectively flush the hole with` a hydraulic jet through the drill point while drilling, and which combination will provide 'for drilling a relatively great incr-ease in depth of holeat each setting ot' the casing.

The above and other objects are attained through the construction shown in the accompanying drawings and in which Figure 1 is a sectional elevation of the lower end oi a well with our drill in expanded drilling position below the end of the casing;

Figure 2 is a transverse section along the line 2-2 of Figure l;

Figure 3 is an end view of the cutting edges of the drill expanded;

Figure 4l is an elevation of the drill detached from its surrounding structure;

Figure 5 is a sectional elevation of the lower end of the well showing the drill collapsed and being drawn within the casing;

Figure 6 is an enlarged view of one of the collapsing jaws of the drill;

Figure 7 is a side view of Figure 6;

Figure 8 is a perspective view ot the jaw retaining block;

Figure 9 is a cross-sectional View of Figure'l along the line 9 9 thereof;

Figure 10 is a perspective sketch of the special packing ring used.

Briefly described, our invention comprises a drill with slidable collapsing jaws which automatically collapse by striking against the lower end of the well casing in pulling the drill, and or" the mounting oi the drill on a long guiding tube working within the casing so that the .drill when expanded will upon reciprocation drill a larger hole than the casing and at all times concentric therewith even to a distance, in practice, some forty feet or more beyond the lower end of the casing so that the casing only has to be lowered after about every forty feet of drilling, also this combination with the hydraulic jet feature alluded to so that the material cut loose by the ldrill will be constantly forced to the top Vof the well between the outside of the casing and the drilled hole which is larger than the casing.

In the illustrations, our drill comprises a shank l having a fixed jaw 2 of a maximum diameter to pass through a well casing 3.

This jaw 2 is beveled at its cutting edge as shown at 2', and at right angles is arranged a pair of collapsible jaws 4 also with beveled cutting edges as shown at 4f.

The collapsing jaws 4; each have a shank 5 slidably supported in a recess 6 in the main shank 1 of the drill so that they are free to slide longitudinally of the drill body and they are retained in position by passing under an enlarged portion or hub 7.

The hub diameter is equal to the width fixed jaw 2 and at the upper part the hub is beveled at 7 where it joins the shank so as i" to be guided into the casing in pulling the drill, and a retaining block 8 is provided on each sliding jaw shank so that the jaws cannot be slid entirely oli of the drill body.

This block 8 is shown clearly in Figure 8 and is seen to be provided with a dovetail slot 9 which lits over a complementarily shaped jaw 10 formed on the jaw shank, so that the block 8 is slid transversely into engagement with the shank or" the jaw to the position shown inFigures 1 and 4l, after which it is secured in place by a screw 1l passing through the block and entering a recess 12 in the shank.

When the jaws are pulled out to their maximum extension the jaws collapse and the blocks 8 abut against a shoulder lon the hub formed by notching opposite sides thereof, and the blocks are provided with teeth 14: so that they will out out any mud fw or stone from the shoulder when seating.

When the jaws are pushed all the way into their respective recesses, the jaws expand and a heavy square shoulder 15 engages a shoulder 16 on the drill hub so as to take the force of drilling, the sliding jaws having wings 33 bearing against the vertif cal walls 34 of the ixed jaw.

' i The expanding and collapsing of the jaws accom` through longitudinal sliding is plished by cooperatively tapering the jaw Shanks as shown at 17 and the central portion of the fixed jaw 2 as indicated at 18.

Thus when the jaws are slid all the wav up they are lirmly seated against the shouliii) lill) llt) lit)

ders as described and expanded to the position shown in Figures l. 3 and l and held trom falling by the friction ot' lint springs t9 secured within the recesses t5 and over which the shanls ot the jaws slide while being*r loreed outwardl)v thereby.

lllhen expanded as shown`r in pulling; theI drill, the jaws will strike the lower end ol 'the casing;l shoe 2t) and casino' E which will slide them down along4 the body to position shown in Figure a seating` the inner surface ot the ,idianlis against the wedge like sides itl olE the centralY portion ot the fixed jaw L?, thus bringing the sliding; jaws together as shown to therebjY clear the inside ot the easingr tor withdrawal :troni the well.

lil/'hen expanded the drill upon reciprocation will drill a hole 2l larger than the lasino' l o1' its shoe 20, and a' hole extending;l through the shank ot the drill and en'icriringV at points .22 provides l'or 'toi-ring' water directly between the cutting edges ot the drill in operation. j

The drill is screwed at 223 to a tubular operating' shanl: 2l consistingh ol several sections ot tubing' coupled as at 25 to provide preierabl)` a length ot' some torti' tent, and at the upper end the tubing closed by a head 2*(3 provided with ports tor tnrcin,r water tio the drill from within the easing Si.

'llhe lower portion ot this casing 3 is prei"- erablj ot a heavier gage than the casing` above it extending to the surface of the well tor suspension in the known manner, and this heavier portion is preferablyY about sixty iieet in length to function as a long;l workingv barrel in drilling` to guide the head 2o ot the reciprocatingl drill rertieallj7 yet provide lor a relatirely long' extension of the hole each time before lnaliinicT it necessary to lower the casing.

llt the upper end oi the tubular shank 2l and surroninling the head :lo is a long paoliint;h ring 2e sealing oll the casing` trom this point down so that water :torced down in the tau-singy above thisv ring will have to pass through the openings 2i' to the interior oli the hollow .shank 2l, and thence to emerge troni the passages to the cutting edges ot the drill. This results in a powerful jet at the cutting edges washing aiwajv all loosened material and forcing it upwardly through the annular spare 2S) outside ot the easing to the top o'tI the well lt since no other channel 'l'or its discharge exists.

The ring is a split ring); and of about three inches in depth so it will ride over the casingl joints in withdrawing the drill and it is prevented 'from catching; on the joints through its spetrial construction.

lt is reallyv two split rines 28 and 28 secured together at some point orpoints and each section has overlapping ends as indicated in Fitejure l() where the ends A and l are separated so as to better indicate its structure.

llhe inner section extends below the outer seetion and seats in a groove 35 in the head QT which permits though limits its outward expansion and it is held lonirltlalinally in piace by a pair ot 'threaded collars -iO-Ifil loclied together above it on the head with just sullieient clearance above the ringl'or it to operate.

Thus the ring is 'forced to il'ollow the vertical inotion et the drill in operation yet is tree for limited expansion, so that when the drill is pulled 'from the redueed internal diY anieter working); barrel portion ot the casingl J3 to the sliehtlj' larger string,l above it, the.

ringl will :treely pass all the casing;l joints on the way out, or when lowering the drill to place utter sinn-peiling the same.

'llo better clear the joints the upper and lower corners ot the outer ring section 28 are well rounded as shown. i

Above the head 2o is a suitable coupling socket 32 tor attaching the ordinary drilling;l cable, not shown.

ldie Claim:

l. :l well drill compi-ising` a body with jaws slidable longitudinail)v thereon from a collapsed to an expanded position, and shoulders on said body and jaws adapted to engage one another when the jaws are expanded, and a lugl on eaeh olf said jaws en-` gaging' a portion olf the body when the aws are collapsed, said litev and portion present- 'ng' spaced points ot eontaet. j

A collapsing well drill comprising,` a drill shank with longitudinal grooves thereon, jaws with shanhs each slidably positioned in one ot the grooves whereby the jaws are slidahle lengthwise ol the drill shank, means i'or retaining the jaws in place while permittinpsliding action, and means tor lirietionally retaining the jaw lshanlcs in position in the grooves A reciprocable well drill, cutting jaws on said drill adapted to slide troni a collapsed position to an expanded position upon end impact ae'ainst the drill in operation, and means tor trietionalljY holdingl the jaws in exjianded relation to 'the drill.

BENJABH N L l. DUDLE Y. EDYVABD R; DUDLEY.

lOl)

llo

Images