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Патент USA US3047319

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July 31, 1962
cs. H. BRUCE
3,047,313
WEIGHTED DRILL COLLAR
Filed Oct. 27, 1961
INVENTOR.
GEORGE H. BRUCE.
BY
A73$%
AFR
.
United States Patent 0 "ice
3,047,313
Patented July 31, 1962
2
1
to the speci?c gravities of the several heavy metals in
3,047,313
Table I.
WEIGHTED DRILL COLLAR
George H. Bruce, Houston, Tex., assignor, by mesne as
signments, to Jersey Production Research Company,
Tulsa, Okla., a corporation of Delaware
Filed Oct. 27, 1961, Ser. No. 148,268
5 Claims. (Cl. 285-47)
Table I
Iron
Lead
Speci?c gravity
____________________________________ .._
7.85
___________________________________ .__
11.35
Mercury
________________________________ .._ 13.5.9
Osmium _________________________________ __ 22.48
The present invention is directed to an improved drill
collar. More speci?cally, the invention is directed to an 10
Uranium
improved drill collar which increases the weight of a drill
string in which it is arranged. In its more speci?c aspects,
Molybdenum
the invention is concerned with a heavy drill collar which
________________________________ __
18.68
Bismuth _________________________________ __
9.80
Tungsten ___
____________________________ __ 10.20
17.20
Certain alloys may also be used as the ?ller in the pres
utilizes the pendulum effect in preventing hole devia
ent invention. For example, alloys of lead may be used;
tion in drilling wells with a drill string.
15 wood‘s metal, antimonial lead and plumber’s solder may
This application is a continuation-in-part of Serial No.
be employed. These alloys have speci?c gravities of 9.7,
850,869 entitled, “Drill Collar,” and ?led November 4,
11.0, and 9.4, respectively.
1959 for George H. Bruce, and now abandoned.
The device of the present invention is easily constructed
The present invention may be brie?y described as a
and the tubular members :11 and 12 may suitably be
drill collar for use in a drill string which comprises inner 20 ?ash welded to the connecting means 15 and 16.
and outer spaced-apart elongated wall members. Ar
In order to illustrate the present invention, a drill collar
ranged between the wall members and bondedly attached
of ?ve-inch outside diameter and two-inch inside diameter
thereto are cellular reinforcing means which provide
with a quarter-inch inner wall and three-eighths-inch outer
strength for the drill collar. The inner of the wall mem
wall and ?lled with lead will weigh about 70 pounds per
bers provides an unobstructed bore for passage of ?uid
foot when made of steel, which has a density of about
and tools therethrough. Means are attached to each end
490 pounds per cubic foot. Lead has a density of about
of the wall members for connecting the drill collar thread
700 pounds per cubic foot. The same. collar made of
edly into a drill string. In the cellular reinforcing means
steel alone weighs about 56 pounds per foot; thus the
there is arranged in the cells thereof a weighting means
dense or heavy metal provides a 25 percent increase in
such as a heavy metal or a derivative thereof having a 30 the weight with no increase in diameter.
speci?c gravity greater than 8.0. By virtue of the drill
The employment‘ of sandwich or cellular or honey comb
collar in accordance with the present invention, a heavy
type of structure has been well developed in many years
drill collar is provided which utilizes the pendulum
and is well known to the art. It is apparent that the cellu
effect in drilling wells in a drill string having the drill
lar reinforcing means is necessarily formed of a high
collar therein.
melting point metal which is substantially chemically
The present invention will be further described by ref
inert to and is not attached by the heavy metal weight
erence to the drawing in which the single FIGURE is an
elevational view partly in section of a preferred embodi
ment.
ing means received in the cells in a liquid state. A collar
such as described herein is therefore easy to construct and
is of substantially the same strength as the conventional
The drill collar of the present invention is made up of a 40 drill collar, but is of greater weight than the conventional
drill collar. Thus, the available weight per foot may be
increased without increasing the drill collar diameter.
spaced apart and are separated by a cellular structure 13
Drill collars such as in the present invention will be as
which may be of a honeycomb type such as used in rein
strong and rigid as those currently in use which are usu
thin-walled outer tubular member 11 and a thin-walled
inner tubular member 12. These tubes 111 and 1'2 are
forcing the airfoils of high-performance aircraft. Honey ,p. Cir ally formed by 'boring and turning operations from large
comb structure 13 is provided with passages into each
forged steel billets. Thus, the present invention provides
cell and throughout the length of the drill collar gener
a drill collar which is heavier and is competitive in cost
ally indicating by the numeral 14 to allow a ?ller material
to ‘be placed in the honeycomb‘ structure 13. The outer
tubular member is also suitably provided with means for
introducing ?ller material into the cellular structure. The
outer tubular member 11 and the inner tubular member
12, forming the drill collar 14, have connecting means 15
and 16 attached to each end thereof for attaching the drill
collar 14 into a drill string for use in drilling a well. The
connecting means 15 and 16 are provided with threads 17
and 18, respectively, for threadedly connecting the drill
with the conventional drill collar.
Moreover, the drill collars now used in drilling opera—
tions to provide weight to the drill Abit and to prevent
borehole deviation sometimes fail to achieve this end.
The drill collars, to prevent hole deviation, utilize the
pendulum effect and to achieve this must be heavy and
rigid. The conventional drill collars made of thick walled
pipe and manufactured by boring and turning a solid
steel forging have weight and rigidity from the thickness
of the wall. Since ‘borehole diameters are limited, wall
thickness of the conventional drill collar is also limited.
The connecting means 15 and 16 are provided with re
The present invention provides a means for adding addi
cesses 19, 20, 21, and 22 into which the wall members
tional weight to drill strings in drill collars where the
11 and 12 ?t such that the wall members .11 and 12 may 60 diameter of the borehole is limited. Accordingly, the
be rigidly and ?xedly attached to the connecting means
present invention is quite advantageous and useful in
15 and 16.
that providing additional weight and thus utilizing the
The heavy metal employed as a ?ller in the honey
pendulum effect, boreholes may be drilled straighter with
comb or cellular structure 13 is preferably lead, but
less deviation than now is frequently encountered.
other heavy metals such as mercury, tungsten, osmium, 65 While speci?c examples of the several heavy metals
and uranium maybe used. Also the derivatives of these
and oxides thereof have been given, these examples are
metals such as oxides and the like may be used such as
by way of illustration and not by way of limitation since
the oxides of lead, mercury, tungsten and uranium. To
any heavy metal or material having a speci?c gravity
illustrate the difference in weights of the several heavy 70 greater than 8.0 may be used as the ?ller material.
metals as compared to iron or steel which usually makes
The nature and objects of the present invention having
up the drill collar, the speci?c gravity of iron is compared
been completely described and illustrated, what I wish to
collar 14 into a drill string for use in drilling operations.
3,047,313
3
4
claim as new and useful and secure by Letters Patent is:
l. A drill collar for use in a drill string which com
2. A drill collar in accordance with claim 1 in which
the metal Weighting means is lead.
3. A drill collar in accordance with claim 1 in which
prises inner and outer spaced apart tubular wall members,
cellular reinforcing means between and bondedly attached
and secured at least to said wall members throughout the Cl
length thereof, said cellular reinforcing means forming a
the metal weighting means is mercury.
4. A drill collar in accordance with claim 1 in which
the metal weighting means is an alloy of lead.
plurality of cells in and throughout the length and width
of said space with passageways in said cellular reinforcing
5. A drill collar in accordance with claim 1 in which
the cellular reinforcing means provides a honeycomb struc
means into each cell, the inner of said wall members pro
viding an unobstructed bore for passage of ?uid, means
attached to each end of said wall members for connecting
said drill collar into a drill string, and metal weighting
means having a speci?c gravity greater than 8.0 in and
?lling said cells whereby a heavy drill collar and a pendu
lum effect to said drill string are provided, said cellular
reinforcing means being formed of a high melting point
ture.
metal substantially chemically inert to and unattacked by
said metal weighting means received into said cells in a
liquid state.
References Cited in the ?le of this patent
UNITED STATES PATENTS
1,712,803
1,746,132
2,126,075
2,814,462
Wood ______________ .._ May 14, 1929
Stockes ______________ __ Feb. 4, 1930
Wright ______________ __ Aug. 9, 1938
DeJarnett ____________ __ Nov. 26, 1957
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