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Патент USA US2126075

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Aug. 9, 1938.
J. C. WRIGHT
2,126,075
DRILL COLLAR
Filed Aug. 24, 1936
2 Sheets-Sheet 1
Aug. 9, _1938.
`
J. c. WRIGHT
2,126,075
DRILL COLLAR
Filed Aug. 24, 1936
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2,126,075
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cor.
.lesse E. Wright, Los Angeles, Calif.; Martha. H.
Wright, executrix oi' .lesse œ. Wright, deceased
Application August 2d, i936, Serial No. 97,507
23 Claims.
This invention relates to well drilling equip
ment and relates more particularly to a drilling
stem or drill collar for use in a rotary well drill
ing string. A'general object of this invention is
to provide an improved and practical drill collar
‘ that materially assists in the rapid drilling of the
Well and that aids in the drilling of a straight
vertical bore.
lin the rotary method of well drilling it is the
ltr usual practice to interpose a drill collar between
the drilling too_l and the drilling string. A drill
' collar consists of one or more cylindrical sections
oi“ steel ten feet or more in length and of the
saine diameter as the drill pipe or sli'ghtly larger
in diameter than the drill pipe. A drill'collar is
provided with a fluid conducting bore of less di
ameter than that of the drill pipe and, there
lore, has greater wall thickness than the pipe.
Thus a drill collar provides additional weight and
‘ " rigidity in the drillingv assembly immediately
above the drilling tool. llt has been found nec
essary> to employ drill collars to lend rigidity to
the otherwise rather flexible drilling string and
to furnish weight to feed or force the drilling
dit tool into the earth formation. When a drill stem
is employed it is possible to maintain the drill
e ing string, or a portion of the drilling string in
suspension while drilling, utilizing the weight of
the drill collar to feed the drilling tool into the
earth formation. In the event that hard earth
formations are encountered it is necessary to
employ a very long drill collar of one hundred
ileet or more in a length to provide the necessary
weight to ieed the drilling. tool to the formation.
if the well bore. is crooked or inclined» the drill
collar has a tendency to fall over against the
wall oi the bore- and further increase the devia
tion of the drill. This is particularly true where
a long drill collar is employed.
Another object of this invention is to provide
a drill collar Whose weight is concentrated in a
minimum vertical zone immediately above the
drilling tool to eiiectively odset the forces tend
ing to cause deviation of the drilling tool from
the vertical.
-
Another object of . this invention is to provide
a drill collar several times greater in weight than
a typical drill collar and that is of minimum
i. 11i i
length whereby a great weight is concentrated
immediately above the drilling- tool which weight
is imposed on the drilling tool to cause it to drill
a vertical bore or to bring it back to a vertical
position.
Another object oi this invention is to provide
a drill collar of suñicient weight that it may con
(Cl. 255-28)
stitute the entire drilling load for the drilling tool
so that the drilling string need not be employed
for drilling pressure and may be maintained un
der tension or in suspension throughout its en
tire length.
~
Another object of this invention is to provide
a drill collar 4of minimum length and of great
weight that may nt or operate in the well bore
with only' slight clearance to act as a stabilizer
and a guide bearing and further assist in pre
_venting deviation of the _drilling tool from the
vertical.
Another object oi’ this invention is to provide
a drill collar of minimum length, great weight ~
and maximum diameter that may be readily
ilshed or recovered from the well in the event
the drilling string parts above the drill collar.
It is customary to employ drill collars of a diame
ter sufficiently small to allow a wash-over pipe
to be run over the drill collar in the event that
the drilling string is parted and the drill collar
and drilling tool are lost in the well.
This re
quirement has limited the diameter of the typi
cai drill collar- and has made it necessary to in- `
crease the length of the drill collars when ad
ditional weight is required so that drill collars
often are one hundred feet or more in length, as
described above. The drill collar provided by
the present invention may be readily recovered
from the well without introducing a wash-over 30
pipe from the surface of the ground and, there
fore, the drill collar may be of maximum diame
ter to operate as a stabilizer or guide and to con
centrate its weight immediately above the drill
ing tool.
'
35
Another object of this invention is to provide
a drill collar embodying an outer part that con
stitutes a wash-over pipe for conducting iluid to
the bottom portion oi’ the well when it becomes
necessary to free the drill collar and the drill
ing tool :from sand or caved in earth formation.
Another object ol’ this invention is to provide
a drill collar or the character mentioned in which
the inner and outer parts may be rotated rela
tive to one another to assist in freeing `the outer
part in the event that it becomes sanded in the
well bore.
'
Another object of this invention is to provide
a drill collar oi the character mentioned in which
the outer part may be moved vertically relative
to the inner part to free it in the event that it
becomes sanded in the well bore.
Another object of this invention is to provide
a drill collar of the character mentioned in which
the outer part carrying the weight blocks or 55
2
10
2,196,075
weight elements may be disconnected from the
inner part and recovered from the well leaving
the inner part so that it may be readily engaged
and recovered by a suitable fishing tool.
A further object of this invention is to provide
a drill collar of the character mentioned that
may be easily assembled in the drilling string and
the drilling tool T. The drilling tool T is in the
nature of a typical fish-tail bit it being under
stood that the drill collar of the present inven
tion is adapted for use with various types of drill
ing tools. It is to be noted that the lower en_d
of the body I 0 may be closely coupled with the
drilling tool T. It is to be understood, however,
that embodies parts that may be easily replaced
that a tool joint or the like may be connected be
when worn.
tween the body IIJ and the tool T, if desired.y The
member I1 is provided with a central longitudi 10
The various objects and features of my inven
tion will be fully understood from the following
nal fluid passage 2l for conducting the circula
detailed description of typical preferred forms
and applications of my invention, throughout
tion fluid downwardly from the passage I4 to the
fluid passage of the tool T.KA The above described
which description reference is made to the ac
body I0 in addition to forming a strong rigid con
nection between the string S and the tool T pro 15
vides substantial weight or load for the tool T
15 companying drawings, in which:
Fig. 1 is a view illustrating one form of drill
collar of the present invention connecting a
typical drilling tool with a drilling string, illus
trating the outer part and the weight elements in
20 longitudinal cross section. Fig. 2 is an enlarged
longitudinal detailed sectional view of the drill
collar illustrated in Fig. 1 showing the inner part
and the sub in side elevation.
Fig. 3 is a frag
mentary longitudinal detailed sectional View of
the upper portions of the drill collar with the in
ner part in elevation, illustrating the ilshing or
recovering member in connected relation with
the outer part. Fig. 4 is an enlarged transverse
detailed sectional view taken as indicated by line
30 4-4 on Fig. 1. Fig. 5 is an enlarged transverse
detailed sectional view taken as indicated by line
5_5 on Fig. 3 and Fig. 6 is a side elevation of an
other form of drill collar of the present invention
illustrating the lower portion of the outer part
35 in longitudinal cross section.
The drill collar of the present invention illus
trated in Figs. 1 to 5, inclusive, of the drawings
includes, generally, a body I0 to be interposed be
tween the lower end of a drilling string and a
40 drilling tool T, a shell or outer part I I surround
ing the body" I0, weight blocks or weight elements
I2 carried by the outer part II and a member I 3
adapted to be run into the well on a fishing string
F and connected with the outer part I I to manip
45 ulate or recover the outer part and the weight
elements I2.
The body II) of the improved drill collar is an
elongate member for connecting the drilling
string S with the drilling tool T. In accordance
50 with the invention the body Il) has considerable
strength and rigidity to dependably connect the
string S and the tool T and to withstand the
various strains to which it may be subjected.
The body I0 may be formed of steel and has a
55 substantial wall thickness to have the required
strength and rigidity. In practice the body I0
may be in the nature of a typical or common drill
collar. In the structure illustrated in the draw
ings the body I0 is cylindrical and is of uniform
60 external diameter throughout its length. A. cen
tral longitudinal fluid passage I4 extends through
the body I0 from one end to the other to conduct
the circulation fluid. Suitable connecting means
are provided at the opposite ends of the body IIJ.
65 A tapered socket I5 may be provided in the upper
end of the body I0 to receive a pin part of the
drilling string S and a similar threaded socket I6
may be provided in the lower end of the body I0.
'I‘he invention provides a sub or connecting
70 member I1 at the lower end of the body I0. The
member I1 has a pin I8 screw threaded in the
socket I6. 'I'he member I'I may be larger in
diameter than the body II) and is provided at its
lower end with a socket I9. 'I'he socket I9 may
75 receive a threaded pin 20 on the upper end of
and operates to carry the various other parts of
the drill collar.
'I'he shell or‘outer part II of the drill collar is
an elongate tubular member surrounding the 20
major portion of >the body I0. The outer part
II performs several functions as will beherein
after described. In the preferred construction
the outer part II is sufficiently large in internal
diameter tosurround the body I0 with substan 25
tial clearance. This leaves suñicient space with
in the outer part II to contain the weight ele
ments I2 and provide for the circulation of fluid
when necessary.' The outside diameter of the
outer part II may be such that the outer part is .30
received in the well bore with only slight clear
ance so that the outer part may engage the wall
of the bore to act as a bearing guide and sta
bilizer for the tool T. In practice the outer part
II may comprise a simple length of tubing as il 35
lustrated. However, it may comprise several
connected lengths of tubing',y if desired. The
lower end of the outer part II is removably sup
ported on the connecting member I‘I in a manner
to turn with the body I0 and the drilling string
S. In'the embodiment of the invention being
described the sub or member I'I is provided with
an upwardly facing external shoulder 22. A
clutch ring 23 is secured to the lower end of the
outer part II and is adapted .to seat downwardly
o‘n the shoulder 22 to support the outer part.
The ring 23 closely surrounds the member I'I to
steady and centralize the lower end portion of
the outer part II.
Releasable clutch means normally connects the 50
outer part II and the member I1 so that the
outer part turns with the body I0. In the. sim
ple preferred structure illustrated flat .walled
notches 24 are provided in the lower end of the
ring 23 and correspondingly shaped teeth or lugs 55
25 project upwardly from the shoulder 22 to co
operate with the notches. The notches 24 and
the lugs 25 are such that they are properly en
gaged when the lower end of the ring 23 rests
on the shoulder »22 as illustrated in the draw 60
ings. It will be apparent that the ring 23 may
be released from the shoulder 22 and its clutch
lugs 25 by raising the outer part II relative to
the body I0.
The upper end of the outer part II is provided
with a head 26. The head 26 may be a tubular
or annular member rigidly secured to the up
per end of the outer part II. In the particular
case illustrated the head 26 has a downwardly
facing shoulder 21 welded to the upper end of 70
the outer part II. The invention provides spaced
longitudinally extending ribs 28 on the interior
of the head 26 to cooperate with the exterior
of the body IIJ. The ribs 28 operate to cen
tralize and stabilize the upper portion of the outer ’II
3
2,126,075
also be provided in the ring 23 to communicate
with the grooves 3|. It will be noted that the
fluid passed downwardly through the passage P
discharges into the well at the lower end of the
struction illustrated a tapered pin 30 is provided outer part II so that its return upwardly through 5
on the upper end of the head 26 and carries the the well may free the outer part for recovery.
thread 29. The thread 29 is coarse or heavy and The blocks or weight elements >I2 preferably- ñt
is of a type that may be easily mated with by rather closely within the outer part Il so that
they do not have excessive lateral or horizontal
the thread of the member I3. The ribs 28 coop
erating with’the body I0 centralize the head 26 movement.
10
It will be observed that the weight elements
relative to the body making the thread 29 read
ily engaged by the thread of the member I3. Set . -at I2 formed of a material -having a high specific
screws 28a may be threaded through openings in gravity add materially to the weight of the drill
part II. In accordance with the invention a
thread 29 is provided on the head 26 to be en
gaged by a thread on the member I3 as will be
subsequently described. In the preferred con
the head 26 for the same purpose.>
_
The weight blocks or weight elements I2 are
provided to give the desired weight to the as
sembly whereby the drill collar is operable to
feed or force the drilling tool T into the earth
formation during the drilling operation. _ In the
collar so that the drill collar imposes a great
weight on the drilling tool T. The elements I2
are housed in the outer part II so that the
weight of the drill collar is concentrated directly
above the drilling tool T. The heavy weight
elements I2 surround the relatively- heavy body
structure illustrated in the drawings the weight ' I0 and the drill collar is of maximum` length. 20
elements I2 are within the outer part II and are The outer part II surrounding and housing the
carried or supported by the outer part. It is a relatively soft weight elements I2 protects thev
feature of the invention that the elements I2 elements against wear and against contact withare formed of a material having a high specific
gravity. Where I herein employ the term “high
speciiic gravity" I mean a speciñc gravity greater
than the specific gravity of steel of which drill
collars have heretofore been constructed. In
practice the weight elements I2 may be formed
30 of lead which has a specific gravity much greater
than that of steel of which drill collars are usu
ally constructed.
Owing to the high specific
gravity of the material of which the elements
I2 are formed, a relatively small number of‘ele
ments may be embodied in the drill collar and
yet may give the vdrill collar the desired weight.
'I‘he invention contemplates the constructing and
supporting of the weight elements I2 in various
manners'.
In the particular case illustrated the '
40 weight elements I2 are annular or tubular block
like parts supported one upon the other in the
annular space occurring between the exterior
of the body II) and the interior of the outer
-part Il. The tubular elements I2 ‘surround the
45 body I0 and the lowermost element is supported
on the upper end of the ring 23. 'I'he number
of weight elements I2 employed depends upon
the drilling conditions it being understood that
any desired number of weight elements I2 may
be employed. When it is desired to impose a
great weight on the drilling tool T a substantial
number of _blocks or elements I2 may be pro
vided within the outer part II in which c_ase
the uppermost element I2 may have its upper
end adjacent the head 26, as illustrated in the
drawings.
'
In accordance with the invention a ñuid pas
sage is` provided through the outer part II to
conduct ilushing fluid downwardly to free the
60 outer part in the-event that it becomes sanded
or mudded in the well. In the construction illus
trated in the drawings the blocks or weight ele
ments I2 surround the body III with substantial
clearance leaving an annular passage P. The
upper end of the passage P is in communica
tion with the interior of the tubular head 26.
Circumferentially spaced ‘ñuid grooves 3l are pro
vided in the exterior of the member I1 and have
their upper ends in communication with the
lower end of the iluid passage P.- The grooves
3l extend downwardly to the shoulder 22 where
they communicate with fluid discharge ports 32.
The fluid ports 32 extend through the member
Il to its exterior where they discharge the ñuid
75 into the well. Fluid dischargel ports 32a may
the wall of the well bore.
'
-
The member I3 is provided to connect with 25
the outer part Il of the drill collar to vfacilitate
manipulation of the outer part or recovery of
the outer part in the event that it becomes caught'
in the well or the drilling string S parts above
the drill collar. The member I3 is adapted to be 30
run into the well on a recovering string or ñsh
ing string F passed downwardly over the drilling
stringfS. In practice the member I3 may be a
simple tubular part directly threaded on the’
lower end of the ñshing'string F. A socket 33 35
is provided in the lower end of the lmember I3
to'receive the pin 39. A thread 34 is provided
on the wall of the socket 33 to mate with the
thread 29. The threads 29 and 34 are such that
they maybe easily made up or threaded to 40
gether to connect the ñshing string F with the
outer part ‘I I. ¿When the member I3 is threaded
on the pin 3|] the ‘ñshing string F connected
vwith the outer part II through the medium of
the member I3 and may conduct flushing ñuid to
the passage P may also be employed to recover
the outer part Il and the weight elements I2
from the well in the event that the drill collar
is lost in the well.
-
.
'
In operation the drill collar illustrated in Figs. 50
1 to 5, inclusive, of the drawings may be'con
nected between the drilling tool T and the drill- ` ‘ '
ing string S as illustrated throughout the draw
ings and run into the well with the tool VT in
the usual manner. During the drilling oper 55
ation the weight of the drill collar feeds or forces
' the drilling tool T downwardly against the earth
formation.
Owing to thev presence of the plu
rality o`f weight elements I2 in addition to the
relatively heavy body Ill, the drill collar is very 60
heavy to urge the drilling tool T downwardly
with substantial force. It is important> to note
that the great weight provided by the drill collar
is concentrated immediately above the drilling
tool to materially assist in feeding the tool to 65
drill a straight vertical bore. The weight pro
vided by the improved drill collar being concen
trated immediately above the drilling tool >T off
sets or resists the forces which may tend to ef
fect deviation of the drilling tool T from the 70
vertical. The heavy drill collar is rigidly and
closely coupled to the tool'T and having a center
of gravity very close to the tool T urges the tool
directly downward even though the earth forma
tion be such -that it tends to deviate the tool from 75
4
2,126,075
coupled thereto feeds the bit directly downward
clutch connection between the outer part II and
the member I1 is sufficiently loose to prevent the
transmission of undesirable vibration between
the parts and to prevent strains being set up in
ly to straighten the bore. The drill collar of
the present invention embodying the blocks or
weight elements I2 may have a weight two or
three times greater than a typical drill collar
and yet may have a minimum length so that it
the connection. The movement between the
parts due to the character and looseness of the
clutch connection prevents the circulation pas
sage P from becoming sanded up.
Fig. 6 of the drawings illustrates a slightly
10 has little or no tendency to tilt or fall against
the wall of the well bore even though the bore
modiñed form of construction in which the ring
23 of the outer part II is threaded to the mem
be inclined. The outer part I'I of the drill collar
may be proportioned to rather closely fit the
ber I1 on the body I0. The various parts of the
drill collar may be constructed and assembled
well bore so that it engages the wall of the bore
as described above. The notches 24 and the lugs
to act as a guide bearing and to stabilize the
bit. This action of the outer part II further. as
25 are eliminated, however, and the interior of
the ring 23 and the exterior of the member I1
are provided with cooperating threads 40. The
'threads 4U normally rigidly connect the outer
part II to the body I0. The threads 40 are prei'
the vertical.
Further, in the event the well
bore is crooked or inclined the heavy compact
drill collar immediately above the bit and closely
Gi
sists in directing the tool T to drill a straight
vertical bore. The outer part II of the drill
collar may be proportioned as above described
erably left-hand threads so that they may be un
20 without danger of the drill collar becoming im
movably caught 0r sanded in the well. The threaded by rotation transmitted through the
heavy drill collar absorbs the shocks resulting string F without endangering the threaded joints
from the action of the tool T on rough and hard and connections of the string and without un
threading the threads 29 and 34. It may be pre
formations.
If for any reason the outer part II becomes ferred to eliminate the fluid grooves 3l and ex
25
tend the ports 32a upwardly through the mem
caught or sanded in the well bore the member I3
may be secured to the lower end of a wash-over ber I‘I to have their upper ends in direct com
string F and passed downwardly over the drilling _munication with the passage P.
.The operation of the construction illustrated
string S to the head 26. Circulation fluid or
30 water may then be pumped downwardly through in Fig. 6 of the drawings is substantially the
the string F to flow through the head 26, the same as the operation of the previously described
passage P, the grooves 3l and the ports 32 and form of the invention. The threads 40 normally
connect the outer part Il with the body I0 but
` 32a into the well at the lower end of the outer
part II. After being discharged in the well the are such that the outer part II may be discon
iluid passes upwardly around the outer part II nected from the body I0 for movement relative
and may free the outer part so that operations thereto or for recover from the well. The string
may be resumed. The outer part II of the drill F may be connected with the outer part I I by
collar thus serves as a wash-over pipe always means of the member I3 as described above and
conveniently available at the drill collar. The rotated to unthread the threads 40 whereupon
string F may be rotated to thread the member the member II carrying the weight elements I2
I3 on the pin 30. The string F may then be may be moved vertically or rotated to free it or
raised to disengage the notches 24 from the may be withdrawn from the well on the string F.
clutch parts 25 whereupon the string F may be
Having described only typical preferred forms
moved vertically. or rotated, or both, to free and applications of my invention, I do not wish
to be limited or restricted to the specific details
45 the outer part II.
In the event that the drilling string S parts herein set forth but wish to reserve to myself
or breaks above the drill collar and it becomes any variations or modiiications that may appear
necessary to fish or recover the drill collar and
to those skilled in the art or fall within the scope
the tool T from the well the string F carrying
the member I3 is run into the well, the member
I3 is engaged over the pin 30 so that the threads
29 and 34 engage, and the string F is rotated to
thread the member I3 on the pin 30. The string
F may then be manipulated and raised in an
attempt to withdraw the lost parts from the well.
If this attempt fails it may be found necessary
to first loosen or free the outer part I I. Circula
tion fluid or water may be pumped downwardly
of the following claims.
through the iishing string F to pass through the
passage P, the grooves 3| and the ports 32 and
32". This iiuid under pressure discharged into
the well passes upwardly around the outer part
II and loosens or frees it from the accumulated
sand, cuttings, etc. If believed necessary or de
sirable the string F may be manipulated to move
the outer part II upwardly whereupon it may
be reciprocated or rotated, or both, to free it.
When freed the outer part II carrying the
weight elements I2 may be withdrawn from the
70 well on the string'F. The removal of the outer
part II carrying the weight elements I2 leaves
the body I9 exposed for easy engagement by a
suitable ñshing tool so that the body I0, the tool
T and any remaining lower portion of the string
B may be readily recovered from the well. The
20
25
30
40
45
Having described my invention, I claim: `
1. A drill collar for use in a rotary drilling
string including, a body to be connected in the
string and having sufficient strength for the
transmission of the forces to which the string is
subjected, a tubular part around the body, cou 65
pling means on the upper end of the said part
for connecting with a washover pipe whereby
said part is adapted to operate as a continuation
of the wash-over pipe, and means removably
connecting the outer part with the body.
60
2. A drill collar for use in a rotary drilling
string including, a body to be connected in the
string and having suillcient strength for the
transmission of the forces to which the string
is subjected, an outer part around the body and
removably carried by the body to be removable
upwardly from the body when the body is con
nected in the string means on the outer part for
coupling with a wash-over pipe, and an element
of high specific gravity carried by the outer part. 70
3. A drill collar for use in a rotary well drilling
string including, a body. means at the ends of
the body for facilitating its connection in the
string, an outer part around the body rotatable
relative to the body to >be freed of material im 75
.
l
5
2,126,075
-pacted about it, releasable clutch means for hold
ing the outer _part against such movement, the
outer part being removable upwardly from the
necting with a fluid conducting pipe whereby the
outer part may act as a wash-over pipe. ‘
l11. A drill collar for connectionA in a. drilling
body, and coupling means on the outer part for . string including, an
inner member to` lbe con-coupling with a wash-over pipe. whereby the
outer part may be removed from the well by
the wash-over pipe.
nected in the string for the transmission of
torque. an outer member oi' steel or the like sur
rounding and supported on the inner member
4. -A drill collar for usein a rotary well drilling for longitudinal movement thereon, and coupling
string including, a body,- means at the ends of
on the upper end oi' the outer member for
lo the body for facilitating its connection in the >means
connecting with a washover pipe.
10
string, an outer part around the body, means
12. A drill collar for connection in a tubular
supporting the outer part> on the body, said outer drilling
string including, an inner member to be
part having a longitudinal ñuid passage whereby .connected in the string for the transmission or
it may act as a Wash-over pipe, and means on torque and having a passage for conducting tluid
15 said outer part for receiving a ñuid conducting. during drilling, an outer me'mber surrounding
string to supply iiuidto said passage.
and supported on the inner member, coupling 15
5. A drill collar for use in a rotary well drilling means on the upper end of the outer member
string including, a body, means at the ends of for connecting with a wash-over pipe, the outer
the body for facilitating its connection in the member having a longitudinal iluid passage open
string, an outer part around the body, a weight at the upper end of the outer member to receive
element carried by the outer part, means sup
fluid from said pipe and discharging adjacent 20
porting the outer ‘part on the body, said outer its lower end for handling ñuid when
the first '
part having a longitudinal iluid passage whereby mentioned passage is obstructed.
it mayact' as a wash-over pipe, and means on
13. A device for use in a well drilling string
25 said outer part for receiving a fluid conducting carrying a drilling tool including, an inner mem
string to supply ñuid to said passage.
ber connected in the string, an outer weight
6. A drill _collar for use in a rotary well drilling member carried by the inner member to be re
string including, a body, means at the ends of movable upwardly therefrom when the inner
the body i'or facilitating its connection in the . member is connected in the string, and releas
30 string, an outer part around the body, means able clutch means connecting the members
supporting the outer part on the body, said outer against relative rotation and releasable by up 30
part having a longitudinal iluid passage whereby ward movement oi’ the outer member relative to
vit may act as a wash-over pipe, and a member to
be run intothe well on a iiushing string to con
35 nect with the outer part whereby the said pas
sage receives fluid from the string.
4
`
7. A drill collar for use in a rotary well drilling
string including, a body, means at the ends- of
the body for facilitating its connection in the
40 string, an outer part, releasable clutch means
removably supporting the outer part on the body
and connecting the outer part with the body to
move therewith, a weight element carried by the
outer part, connecting means on the outer part.`
45 a member to be run into the well on a fishing
string, and connecting means on the member to
450
the inner member.
»
14. A device for use in a well drilling string
carrying a drilling tool including, an inner mem
ber connected in the string, an outer member
surrounding the inner member, left hand threads
releasably connecting the members, and a lright
hand thread on the upper portion of the outer
member adapted to be cooperated with by a sim
ilar thread on a tool for transmitting rotation to
the outer member to unscrew the first mentioned
thread.
.
15. A device for use in a weil drilling string
carrying a drilling tool including, an inner mem
ber connected in the string, an outer- member
mate with the ñrst mentioned connecting means
.whereby the outer part may be recovered from
the well.
surrounding and rotatable with respect to the
inner member, and releasable means coupling the
8. A drill collar for use in a rotary well drilling
string including, a body, means at the ends of
rotates therewith and releasable by upward
the body for facilitating its connection in the
string, an outer part surrounding the body with
clearance and removably carried by the body to
55 be removable upwardly therefrom, coupling
means on the outer part for connecting «with a
.pipe passed downwardly over the string, and
material of higher speciñc gravity than the body
in
the space between the bo'dy and outer part.
60
9. A drill collar for use in a rotary well drilling
string including, a body, means at the ends of
the body for facilitating its connection in the
string, an outer part carried by the body and
65 surrounding the body with clearance, and a stack
. of annular blocks surrounding the body within`
the outer part.
10. A drill collar for use in a rotary well drill
>ing string including, a body, means at the ends
outer member to the inner member so that it
movement of the inner member relative to the
outer member to allow rotation of the outer mem
ber relative to the inner member.
16. A drill collar for use in a tubular rotary
Well drilling string comprising, an elongate body 55
to be interposed in the string, the body having
a longitudinal fluid passage _for conducting the
drilling fluid during drilling and'having a iluid
passage out of communication with the iirst
mentioned passage for handling ilushing ñuid
when ñshing the drill collar from the well, and
a coupling part on the body for coupling a wash
over pipe with the body to supply ilushing iluid
to the second mentioned fluid passage.
i7. A drill collar for use in a tubular rotary 65
well drilling string including, a body to be con
nected in the drilling string and having a pas
sage for conducting the circulation fluid handled
by the drilling string and a fluid channel sepa
70 of the body for facilitating its connection in the v rate from the passage, and coupling means on
string, an outer part surrounding and removably the body for connecting with a wash over pipe 70
carried by the body, the outer part having a lon
' gitudinal iluid passage extending from its upper
portion to its lower portion, and coupling means
75 on the upper portion of the outer part for con
and operable to conduct fluid therefrom to said
channel.
°
.
13. A drill collar for use in a tubular rotary
well drilling string including, a body„,to be con
6
2,126,075
nected in the drilling string and having a pas
sage for conducting the circulation fluid handled
by the drilling string, means for conducting
flushing iiuld longitudinally of the body to dis
charge from the lower portion thereof, and con
necting means carried by the body for connecting
with awash over pipe to receive fluid therefrom
and deliver it to said means.
19. A device for use in a rotary drilling string
10 including, a drill’ collar body to be connected in
' the string and having sufllcient strength for the
transmission of the forces to which the string
is subjected, a part formed of a material hav
ing a higher specific gravity than the body sur
ll rounding the body to slide and rotate thereon
and removably carried by the body to be remov
able upwardly from the body when the body is
connected in the string, and means connecting
the body and said part against relative rotation
20 when in a predetermined relative position.
20. A drill collar for use in a rotary well drill
ing string including, a body, means at the ends
of the body for facilitating its connection in the
' string, a tubular part around the body shiftable
relative to the body, there being a longitudinal
fluid passage through said part opening into the
‘ well whereby the outer part may operate as a.
wash-over pipe, a weight element formed of a
material of higher specific gravity than the body
and carried by the said part, and clutch means
supporting the outer part on the body whereby
the weight of said element is imposed on the
string.
21. A drill collar for _use in a rotary well drill
ing string including, a body, means at the ends
of the body for facilitating its connection in the
string, an outer part fitting the body for rota
tion relative to the body and for longitudinal
movement relative to the body, clutch means're
movably supporting the outer part on the body.
and connecting the outer part with the body t0 5
turn therewith when in a predetermined longi
tudinal position relative thereto, a weight ele
ment carried by the outer part, and a member
to be run into the well on a ilshing string to
connect with the outer part to recover the same.
22. A drill collar for use in a rotary well drill
ing string including, a body, means at the ends
of the body for facilitating its connection in the
string, an outer part carried by the body to be
removable upwardly therefrom when the body is
connected in the string, the outer part surround
ing the body with clearance, a thread on the
upper end of the outer part forming coupling
means on the outer part for connecting with a
pipe passed downwardly over the string, means 20
connecting the body and the outer part releas
able by relative rotation between lthe body and
the outer part, and a weight in the outer part.
23. A device for use in a well drilling string
carrying a drilling tool including, an inner mem
ber connected in the string, a weight rotatable
relative to the member and shiftable longi
tudinally of the member, and parts on the mem
ber and weight cooperating when the weight is
in a predetermined position longitudinally of the 30
-member to detachabhr couple the weight and the
inner member so they rotate‘together, the weight
being removable upwardly from the inner mem
ber when the said parts are out of cooperating
engagement.
-
JESSE C. WRIGHT.
35
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