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Патент USA US3024852

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March 13, 1952
Filed Sept. 4, 1958
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BY Mi 9. [Aw
United States Patent O?ice
Patented Mar. 13, 1962
At its upper end sleeve 1 has an internal screw thread
5 so that in the conventional way the sleeve can be
lowered into the bore hole at the end of a piece of
Maurycy Ringler, 3 Beth Oren St., Yad Eliahu,
Tel Aviv, Israel
Filed Sept. 4, 1958, Ser. No. 758,942
Claims priority, application Israel Feb. 4, 1958
4 Claims. (Cl. 166—-55.6)
pipe 8, to the upper end of which another pipe is screwed
and so on to be ?nally ?xed to a drive for rotating.
Near the lower end of sleeve 1 two pairs of detents 12
are provided adapted to lie flat at the inner face of
sleeve 1 and urged by springs 13 or by their own weight
In sinking a Well the drill is positioned at the end of
into horizontal position so as to lie athwart the interior
a shaft constituted by steel tubing. As the drilling 10 of the sleeve. Within sleeve 1 a short piece of tube 11
proceeds pipes are successively lowered into the bore
is slidably supported for a purpose yet to be described.
hole lining the latter. Thus the said hollow shaft extends
When it is desired to retrieve a shaft from a bore
within a pipe casing reaching down into the bore hole.
hole and to cut 01? the shaft or a fouled drill the sleeve
It sometimes happens that for one reason or another
1 is slipped, at the mouth of the bore hole, over the
the hollow shaft (the drill pipes) or the drill collar 15 upper end of the shaft. At that instant the short piece
has to be cut off so as to retrieve it from the bore hole.
11 being in slidable frictional ?t within sleeve 1 holds
the cutters in their position ?ush with the sleeve wall.
plicated design. Such cutters have to be lowered through
When sleeve 1 is slipped downwardly member 11 will be
the narrow annular space between the said shaft and
pushed out by the edge of the hollow shaft but still the
the casing and are therefore as thin walled as possible. 20 cutters, though under the urge of springs 4, cannot snap
That necessity imposes limitations on the designer and
inwardly but will lie within the wall of sleeve 1 and abut
that is the reason why such cutters are not entirely satis~
against the outside of the hollow shaft 14. On its way
factory. Their main disadvantage is that they can cut
down the sleeve 1 will cut through incidentally accumu
through thin walled drill pipes up to, say, 12 mm. only
lated hindrances, for which purpose the teeth 10 are pro
so that they cannot sever a so called drill collar with a 25 vided. When the tool has arrived at the position where
Wall thickness of, say, 45 mm. For such reason it may
it is to cut, the cutters 33 will be in position on the shaft
For this purpose cutters are used of more or less com
even happen that a bore hole has to be abandoned.
14 and so will be the cutters 34 but at a slightly higher
It is the object of the present invention to provide a
level. The cutting operation can now be started by
cutter of novel construction, and more speci?cally one
rotating sleeve 1 about its axis. All four milling cutters
which can ‘be used for cutting drill collars.
30 will start milling a groove into the wall of the hollow
It is another object of the invention to provide a cutter
shaft 14. Cutters 34 mill a groove to a certain depth
of simple construction which can easily be lowered in
and then their arms 3 will apply themselves to the edge
the bore hole to its eventual position of work.
of the milled groove and no further deepening of the
These and other objects of the invention will become
cut will be obtained by these cutters. However, the
clear from the following detailed description with refer 35 groove cut by cutters 34 will permit the Working face of
ence to the annexed drawings showing in FIGURE 1
cutters 33 to penetrate deep enough to cut through the
the new cutter in an elevation, partly in section. FIG
wall without arm 3 striking against the edge of the groove
URE 2 is an axial sectional view of the new cutter.
and preventing further penetration. This is so because
FIGURE 3 is a like view of the cutter in position on a
the edge of the groove cut by cutters 33 has previously
hollow shaft and during the cutting operation, FIGURES 40 been removed by cutters 34 (see FIGURE 3). When
4, 5, and 6 are horizontal sections along lines IV——-IV,
cutters 33 have cut fully through the wall of the shaft
V—V, VI-VI of FIGURES l, 2, 3 respectively. FIG.
and severed it above the drill it is possible to retrieve
7 shows a front elevation of a milling cutter.
the shaft. This is done by pulling up sleeve 1. Detents
FIG. 8 shows a side elevation of the same, partly
12 urged inwardly by springs 13,, will then engage under
in section, as seen in the direction of arrow VIII of 45 the cut edge and will pull up the whole shaft together
FIG. 7.
with the upwardly moving tool. If necessary, the opera
FIG. 9 is a section of the milling cutter along line
tion may be repeated i.e. a drill collar may be cut into
IX-~IX of FIG. 8.
several pieces which may be lifted one after another.
A sleeve 1 is provided at its lower end with a set of
Cutting of a drill collar will take up to four hours
circumferential teeth 10. The sleeve will 'have a diam 50 with 40-45 r.p.m. Cooling of the cutter may be per
eter suitable for the diameter of the bore hole and that
formed by mud or water circulation as known per so.
of the drill pipes or drill collar. In the wall of sleeve
What I claim is:
1 there are provided two pairs of diametrically opposed
1. Apparatus for cutting drill collars and drill pipes
cut-outs or openings 35 in which are articulated by
in bore holes comprising, in combination, a sleeve having
means of pins 2 downwardly extending arms 3 which 55 means for connection to rotational drive means, said
at their lower ends carry milling cutters 33 and 34. The
sleeve having a longitudinal axial ‘bore slidably receiving
arms and cutters are of such crosswise dimension that
a hollow drill shaft therewithin, said sleeve having wall
they can be accommodated within the thickness of the
portions de?ning a plurality of circumferentially spaced
wall of the sleeve. In the example shown four such
apart cutouts, at least two pairs of milling cutters having
cutters are provided, evenly distributed around the cir 60 working faces facing inwardly of said bore, each of said
cumference of the sleeve, two cutters 33 reaching slightly
milling cutters being articulated within said cutouts, one
lower down than the two other cutters 34. The cutters
pair of said cutters having said working faces at a higher
on their arms 3 swing in said openings 35. Flat springs
level than the level of the remaining milling cutters and
4 are ?xed at the lowermost edge of openings 35 ?ush
being adapted to cut a groove which overlaps the groove
with the outside of sleeve 1 and urging arms 3 inwardly. 65 cut by said remaining milling cutters, and spring means
yieldably urging said cutters radially inwardly of said
longitudinal bore of said sleeve.
2. Apparatus for cutting drill collars and drill pipes in
bore holes as claimed in claim 1, wherein the lower edge
of the sleeve is provided With teeth.
3. Apparatus for cutting drill collars and drill pipes as
claimed in claim 1, further comprising detents supported
adjacent to the lower edge of the sleeve urged into hori
zontal position to lie athwart the interior of the sleeve.
4. Apparatus for cutting drill collars and drill pipes as 10
claimed in claim 1, further comprising a short piece
of tube of an outside diameter substantially equal to the
inside diameter of the sleeve and adapted to be inserted
into the sleeve to retain the cutters in retractable position.
References Cited in the ?le of this patent
Kammerer __________ __ Apr. 19, 1927
Wiedeke ____________ __ Jan. 20, 1931
Dumble _____________ __ Mar. 21, 1950
Murphy et a1. ________ __ Apr. 4, 1950
Storm ________________ __ Sept. 8, 1953
Chauvin ____________ __ Nov. 30, 1954
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