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Патент USA US3075599

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Jan. 29, 1963
Filed Feb. 26. 1960
F'|s.2. BY
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United States Patent 0
ice ’
Patented Jan. 29, 1953
These and other objects and advantages of the present
invention are generally attained by providing in a drill
pipe string a stabilizer sleeve slidably mounted thereon
for limited axial movement. Co-operative means are pro
De Orr Cook, 85 Eugenia Drive, Ventura, Calif.
Filed Feb. 26, 1960, Ser. No. 11,228
2 Claims. (Ql. 175-295)
This invention generally relates to well drilling opera
tions and tools for use in drill pipe strings, and more par
ticularly concerns a stabilizer or reamer tool designed for
interposition in the string to be employed for the function
of continuously reaming out the bore hole as well as main
taining the string concentrically positioned within the
bore hole.
Apparatus functioning for this purpose, for example,
is disclosed in applicant’s Patent No. 2,869,827, issued
January 20, 1959, entitled “Retrievable Stabilizer for Well
The combination stabilizing and reaming apparatus of
the present invention, however, is also directed to certain
additional functions not contemplated by the tool disclosed
in the aforementioned patent.
When drilling through certain formations, the particular
stabilizer or reamer device as such may become stuck or
impacted in the bore hole.
Usually, the stabilizer or
reamer is at least as large in diameter if not greater in
diameter than any of the other components of the drill
pipe string. In consequence, although the stabilizer and/
or reamer may itself be stuck, the remainder of the string
under such circumstances is usually free for rotation, at -
least above and immediately below the stabilizer,
The most common condition causing freezing of the
stabilizer in the well may be attributed to keyseating; for
example, when drilling through a soft formation in which
the drill pipe (under tension) is operated through ‘a
crooked hole. In other instances, upon stoppage of circu
lation, drill cuttings may accumulate about the stabilizer
and effectively freeze it and the coupled string in the hole.
In the past, it has usually been necessary to remove the
free portion of the column or string above the particular
point at which the pipe is frozen, and‘ thereafter recover
vided on the string and the sleeve for coupling the sleeve
in a ?rst axial position relative to the string for rotation
therewith. In addition, other co-operative means are
provided on the string and sleeve for effecting a jarring of
the sleeve when it is disposed in a second axial position
relative to the string.
In a preferred embodiment, the combination stabilizing
and reaming apparatus is made up as a unitary tool for
axial inter-position in the drill pipe string and includes an
elongated mandrel having an upper end designed to be
r coupled to an upper part of the drill pipe string and a lower
end designed to be coupled to a lower part of the string.
The mandrel has an intermediate reduced diameter portion
of given axial length to de?ne spaced upper and lower
In accordance with a primary feature of the present in
vention, a stabilizing sleeve is slidably mounted on the
reduced diameter portion, with the sleeve being of lesser
axial length than the given axial length, and with the sleeve
de?ning a bottom end portion designed to engage the
lower shoulder and a top end portion designed for coupling
to the upper shoulder. The lower shoulder and the bottom
end portion include co-operating means designed upon
engagement to effect axial jarring of the sleeve in response
to a given direction of rotation of the mandrel relative
to the sleeve.
A better understanding of the structure and functions
of the combined stabilizing and reaming apparatus of the
present invention may be had by reference to the drawings,
showing an illustrative embodiment, and in which:
FIGURE 1 is a view of the combined stabilizer and
reaming apparatus of the present invention with parts
thereof being shown in section, and with the stabilizer
sleeve being coupled for normal clockwise rotation with
the drill column; and,
FIGURE 2 is a view of the apparatus of FIGURE 1
showing the parts of the combination stabilizer and reamer
the lower portion by ?shing operations. In this practice,
apparatus in position for jarring of the stabilizer sleeve
it is ?rst necessary to ascertain the location of the frozen
as such.
Referring now to the drawings there is shown in FIG
pipe, and thereafter lower a light charge‘of “string shot”
explosive cord to the top of the critical zone, where it is 45 URE 1 a tubular body or mandrel 10, which preferably
comprises a part of the overall tool of the present inven
detonated to deliver a sharp jar to the pipe sufficient to
tion but which could conceivably be a modi?ed portion
loosen the threaded joint in the nearest collar. The free
of the drill pipe string. The mandrel 10 is provided
pipe may then be released by turning it counter-clockwise
with a passage 11 for communication with the interior
at the surface and removed from the well. The particular
?shing operation may then be commenced to recover the 50 of the drill pipe string, and includes at its upper end a
threaded joint 12 for connection to an upper part of the
stuck portion of the column.
drill pipe string (not shown) in a conventional manner.
Another object of the present invention is to provide a
The mandrelltl is provided with a reduced diameter
stabilizer and reaming apparatus which is so constructed
portion 13 including threading 14 at the upper end there
1 and mounted on the drill pipe string that it may in the event
of keyseating or the like co-function with the drill pipe
The reduced diameter portion 13 has slidably mounted
string to jar itself loose instead of requiring the entire
thereon a stabilizer sleeve 15 having external ?ns or
free portion of the string above it to beremoved and ?shing
blades 16 similar to those described in the aforemen
operations employed, as heretofore mentioned.
tioned Patent No. 2,869,827.
Another object -of the present invention is to provide
The sleeve 15 is_pr0vided with internal threads 17
a relatively simple and economically constructed com 60
adapted for coupling to the threads 14 of the reduced
bination stabilizing and reaming apparatus adapted for
diameter ‘portion 13 in the manner as shown in FIG
interposition in a drill pipe string, which will not only
perform its primary function of stabilizing the string and
URE l.
reaming the hole, but which also embodies means such
that in co-operation with the string it may be jarred loose
in the event of keyseating or otherwise becoming stuck in
the body of the mandrel 10 an upper shoulder 18.
the hole.
The reduced diameter portion 13 further de?nes with
The sleeve stabilizer 15 has provided at the lower end
thereof ratchet or clutch teeth 19 designed in one rela~
tive positioning of the sleeve 15 and mandrel 10 ‘to
engage a collar or lower end portion 20 of the mandrel
A still further object of the present invention is to pro
vide a combination stabilizing and reaming apparatus for
use in a drill pipe string which is rugged in its construction 70 10. The collar 20, towards this objective, includes mating
teeth 21 designed to co-operate with the clutch teeth 19
and which has only a single movable part of relatively long
in a manner that will become clearer as the speci?cation
proceeds. The collar 20 is preferably a separate member
expanded by heating and shrunk on to the mandrel 1h.
At such time, the drill pipe column is again lowered
joint 22 designed for coupling to a joint 23 of a lower
such that the threads are again coupled to the threads 23,
and that the threads 14 of the reduced diameter portion
13 are again coupled to the upper threads 17 of the
part of the drill string 24, all as more clearly shown in
the view of FlGURE 2. Of course the lower portion of
stabilizer sleeve 15, by clockwise rotation of the drill
pipe string.
'1 he mandrel 10 terminates at its lower end in a threaded
the drill string 24 also includes an inner passage 25 de
Preferably, prior to making up the threaded connec
signed for communication with the passage 11 and the
tion between the sleeve and mandrel, the sleeve is pulled
up the hole a short distance to assure that the threading
passage of the upper part of the drill String (not shown)
in a conventional manner for the circulation of drilling 10 connection between threads 14 and 17 will be made up
initially and prior to the joint 22—23.
The operation of the combined stabilizing and reaming
In the event that certain of the drill collars are also
apparatus of the present invention may now be described.
frozen in the well hole, the tool after being made up,
In normal drilling practice, the apparatus will be axially
may be used as a reamer for drilling up through the hole
to condition it so that ?shing tools may safely be run in
interposed in the drilling column in the manner as shown
in FiGURE 1 with the joint 12 threaded to an upper
part of the drill string and the joint 22 threaded to a
to regain the drill collars left in the hole. Of course,
if no drill collars were stuck, drilling may be commenced
without any further work stoppage.
lower part 24 of the drill string. As, in conventional
practice, the drill string or column will be rotated clock
wise (looking down) as indicated by the arrow adjacent I
the sleeve 15.
In the event that the stabilizer 13 be
It will be apparent from the foregoing that the com
bined stabilizing and reaming apparatus of the present
invention not only functions for its primary purpose, but
present apparatus enables freeing of the sleeve 15 without
also enables a rugged and simple method of expeditiously
loosening the stabilizer in the event it becomes stuck or
frozen in the side walls of the bore hole without the neces
removal of the drilling column or string.
Towards this end, as in conventional practice, a “string
shot” is lowered to a point adjacent the threaded con
sity of removing the drill column. In addition, the ap
paratus of the present invention is made up of only two
parts, the sleeve and the mandrel, it being possible as
nection 22—-23 with the explosive being detonated to
loosen this joint preparatory to unthreading. Thereafter,
the drill pipe column is rotated counter-clockwise to ef
heretofore mentioned to embody the mandrel as a sec
comes stuck because of keyseating or other freezing there
of with respect to the side walls of the bore hole, the
tion of the drill pipe string by modifying it as indicated.
Certain modi?cations and changes in the structure of
the combined stabilizing and reaming apparatus of the
fect an unthreading of the joint 22—23. It will be ap
preciated that as the joint 22—23 is being unthreaded,
present invention will occur to those skilled in the art.
Such modi?cations and changes are deemed to fall within
the upper thread 17 of the sleeve 15 will also be un
threaded from the threads 14 on the reduced diameter
portion 13. Toward this end, the threads 14 and 22 are
the scope of the present invention as set forth in the
following claims.
What is claimed is:
both right hand threads; also, preferably the threads 14
are straight threads while the threads 22 are tapered
1. A stabilizing and reaming apparatus comprising, in
combination: a mandrel having a threaded portion adja
cent to its .upper end and a jarring means adjacent to
its lower end spaced a given axial distance below said
threads such that the threaded joint 22—23 will be un
coupled sooner than the joint made up of threads 14-417.
It is conceivable that if this design were different, that
it would be possible for relative axial movement to oc
threaded portion; a stabilizing sleeve of axial length less
than said given axial distance freely rotatable and slidable
along said mandrel between said threaded portion and
said jarring means, said sleeve having threads at its upper
end for threaded connection to. said threaded portion
when in a ?rst position and cooperating jarring means
cur between the sleeve 15 and the mandrel 10 to effect
engagement of the teeth 19 and 21 prior to the time that
the joint 22-23 were loosened; in such event, further
counter-clockwise rotation of the mandrel 16 could not
be effected.
After the joints 22—23 and 14-17 have been un
at its lower end for engagement with said jarring means
coupled, the drilling column is lifted upwardly in the di
rection of the arrow into the position as shown in FIG
URE 2.’ Thus, the reduced diameter portion 13 will
move axially upward relatively to the now stuck sleeve
adjacent to the lower end of said mandrel when axially
moved to a second position, whereby- said mandrel may
50 form part of a drill pipe string and said sleeve held
against axial movement and rotated with said drill pipe
string in a ?rst direction when in said ?rst position in
threaded engagement with said threaded portion, and
whereby said drill pipe string may be rotated in an op—
posite direction and raised to reposition said sleeve in
said second position to effect a jarring of said drill pipe
15 since the, sleeve 15 has a slightly larger internal di
ameter than the reduced diameter portion 13.
Thereafter, the drilling string may again be rotated
in a conventional clockwise direction, while still main
taining the column or string under tension.
As this latter rotation occurs, the teeth 21 will be
forced axially downwardly relative to the teeth 19 through
2. An apparatus according to claim 1, in which said
jarring- means and‘ cooperating jarring means comprise
180° rotation because of the inclined mating surfaces,
and thereafter jarred upwardly relative to the teeth 19
ratchet teeth on said lower end of said mandrel and
sleeve, respectively.
to cause a sudden impact on the lower end of the sleeve
'15. A further 180° rotation will again effect a gradual
lowering of the teeth 21 to be terminated again by a
sudden upward movement thereof, to again jar the
sleeve 15.
It will be appreciated after several revolutions of the
drill pipe column and the resultant jarring occurring be
tween the teeth 19 of the sleeve 15 and the teeth 21, that
the stabilizer sleeve 15 will become free of the surround
ing side walls so that the drilling operation may again 70
be commenced.
References Cited in the ?le of this patent
McLean et al. _, _______ __ Apr.
Banks ______________ __ Dec.
Shelton _____________ __ Jan.
Cannon ____________ __ Sept.
Pate et al. __________ __ Apr. 30, 1957
Cook ______________ __ Jan. 20, 1959
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