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Патент USA US2121267

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June 2l, 1938.
D. U. SHAFFER
ROTARY, STRAIGHT-PULL JAR ASSEMBLY
Filed June 25, 1937 '
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2,121,267
i Patented -June 211, 1938 l
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f UNITED STATES
PATENT orrics ß
2,121,267
ROTARY, STRAIGHT-PULL .TAR assnrnaLYA
annals n. Shaffer, rico, calm
Application June 25, 1937, Serial No. 150,289
17 Claims.
'Iïhis invention is a rotary-stem, straight-pull
release :jar assembly for various operations in
deep well drilling practice.
In deep well work the lower portion of a string
5 `of tool sections may become so lodged in the for
‘ mation orin a cemented casing in the well hole,
or so jammed from one cause or another that it
cannot be rotated free or pulled without undue
and hazardous strainon the string of parts to
10 the well head, and to the head works.
‘
It is known that up-‘jarring shocks are highly
edective in `elîorts vto release the stuck part, or
“fish” as the case may be.
I
.
An object of this invention is to provide a
simple, practical, reliable and readily operative
means whereby to accomplish the upjar blow
without necessity of rotating the tool string in
either direction to effect the actual shock vibra
tion to the struck‘part.
20
A further object of the invention is to provide
a novel jar assembly in which the function of
jarringis accomplished by the application of a
suitable degree ot‘tension» to the free section of
the tool string whereby to overcome resistance
25 of a variable re-action >device which controls
interconnection between coordinate elements of
the mechanism.
1
‘
`
An additional Objectis to provide a jar‘mech
anism in which means are provided to accomplish
3. o
rotation of the jarring assembly in either a closed
or an open position of the parts, and also to pro
vide for rotation of one section, as a hammersec
tion, as to another section, say a mandrel unit,
for variation or adjustmentI of the resistance of
the said re-action device.
I
A still further object is to provide a tool string
jar assembly in which the jar controls are adapted
to be both set for action and to be tripped for jar
`ímpingement by a simple reciprocative movement
40 of the upper, I.tension-applying section of the as
sembly.
,
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(Cl. Z55-4&7)v
,
,
stood that modifications, variations'and adapta
tions may be resorted to within the scope, princi- 1
ple and spirit of the invention as it is more direct- `
ly claimed in the appendage.
I
Figure 1 isan axial, sectional elevation of the
jar >assembly with the parts in closed, load-apply
“ing and rotating relation, and with the jarring
hammer in open or spaced relation as to its anvi1.`
Figure 2 is a side elevation of the assembly wash
pipe, per se. Figure 3 is a cross-section on line 10
>3--I1!, Fig. 1, through the hammer. Figure 4 is a
cross-section on line ll-Il, Fig. 1, at the head‘of
assembly latching‘means or connectors. `Figure 5
is a sectional elevation of a connector bolster part
or collar. Figure 6 is a cross-section on line 6_6,
Fig. 1, through the assembly mandrel and an ad
justing sleeve. Fig. 7 is a cross-section on line
'l--l of Fig. 1, and Figure 8‘is a sectional eleva
tion of the adjusting sleeve. Figure 9 is an eleva
tional, axial section ofthe hammer in striking 20
juxtaposition to its anvil.
`
At the jar assembly bottom kthere is a pin 2 for
screwing onto any desired combination of parts
therebelow inthe usual manner,say of a fishing
tool. The pin has internal threads 3 to receive 25
enlarged body or piston 5 packed and slidably and
, the threaded end of a mandrel shank 4 having an
turnably in a shell or barrel part 6.
`'ll'he‘barrel 6 has its lower end provided with
clutch spurs 'l to interlock with pin body spurs 2a 30
when the barrel is in the lower, illustrated posi
tion `whereby to load and rotate the subjacent‘
parts of the tool string, as may be required in
fishing or other operations. The foot of the bar
rel 6 has interior, clutch lugs 8 to move upwardly
into interlock with respective lugs 9 on‘the lower
end of the piston body 5 of the mandrel 4.
The mandrel 4 is hollow for circulation" of drill
ing fluid and has a stem 4', above the piston 5,
attached at Ill to the lower end of a wash-pipe II
which extends to the top of the assembly, Fig. 1.
The mandrel stem is provided with suitable spline
Particularly, `an object is to provide a jar' as
sembly in which `the several parts of the control means or keys I2 to slidably and non-turnably re
means are of simple,‘rugged and low-cost struc
ceive a sleeve or nut I3, above the piston 5,
ture and are capable of ready assembly and inter
threaded at I4 into an elongated shell or jacket
change, and may severally be stored and trans
part I5 which threads at I6 `into the barrel 6.
ported` to facilitate emergency field renewals. In l Parts `2, 4 and II form a mandrel structure or
other words an object is to eliminate costly and section of the assembly.
‘
cumbersome elements, in jars of the class here
When the barrel 6 is " lifted free` at clutch 'l
50 concerned, and which are subjected to severe
from the pin 2 the barrel may be rotated about 50
, stresses during service. I,
`
the mandrel 4-4’ with the result »thatthe sta
The invention consists in certain advancements tionary or'ñsh-held, splined stem d' holds the
in the art `ci well tool string jars as set forth in sleeve I3 from rotating with the attached jacket
the ensuing disclosure and having, with the I5 and barrel, with the Vresult that the sleeve I3
55 above, additionalobjects and advantages as here
will climb on the mandrel, if the jacket is turned
inafter developed, and. whose construction, com
right-hand, as hereintended. This action is for
‘ bination and details of means, and the manner the purpose of placing a suitable, helicalspring
of operation thereof will be made manifest in I1 under increased compression between its anti
the following description of the annexed illustra
friction seat ring I8 onithe crown I9 of the sleeve
60 tive embodiment of apparatus;` it being under
I3 and an upper bolster or wedge-collar 20 which 60
2
2,121,267
the latch toes 24' under the _shoe ring 29. The
tool is then ready for a repeat jar. Both the
The spring I1 is encased by the shell Ajacket I5 - vsetting and the tripping action of the coupling
slides freely on the wash-pipe II, and in shell
part I5.
whose upper end screws at 2i into a shell thimble
22 attaching at its upper end to a bushing anvil 23.
' The wedge of the bolster collar 20 faces up
ward and forms a seat for the toe ends 24’ of a
plurality of wholly- independent, link-forming,
rigid latch elements 24 of _arcuate cross-section
and having external shoulders 25 at their foot
,
means, here the latches 24, are accomplished by
only straight up or down motionsvoi! the ham
mer section of the tool string, thereby eliminat
ing hazard of reverse turn, unscrewlng of the
threaded string sections at any joint.
The hammer string'may be pulled up to un
clutch the parts 1-2‘ to unload the standing pin 0
2 and then rotated free to turn the jacket I5
ends to upwardly engage a hard shoe-ring 25
which is set in the jacket I5 just below the to adjust the pressure of the spring I1 of the
thimble 22; the spring supported bolster collar bolster device, or the hammer may be pulled high
2l normally thrusting the latch shoulders 25 enough to close the clutch parts 8_9 to enable
15 outward into such interlock with the shoe
the pin 2 to be rotated without load or be pulled
from thehole, with the fish if this has been
ring 25.
In this position of the parts the upper hook -jarred loose, or without it.
What is claimed is:
ends 24* oi'- the latch elements 24, which sur
1. A well string jar assembly including: a ham
round the adjacent pipe II, are interlockedinto
20 the neck recess 21 in the lower end of a cylin
mer section and a relatively telescopic anvil sec
drical hammer 29 having a piston body 29 and
tion to be jarred thereby and a mandrel section,
being splined at 90 in the relative bore of the
having means to engage a fish held in a well hole,
bushing anvil 29, below which the hammer pis
on which the anvil section is telescopic »between
limits, a coupling means for tensionally connect
ing the hammer and the anvil sections in ham
mer spaced relation, and a yieldable bolster de
vice slidably combined with the mandrel and
releaseably holding said connecting means in
ton is packed and reciprocates in the nipple or
25 shell part 22, when permitted. The hammer 29
screws at Il into the near end of a string cou
pling box 22 in which the wash-pipe II is slid
ably packed at 99.
The parts 29 and 92 form the hammer section
30 o! the assembly, and parts 23, 22, I5 and 6 form
the anvil section.
Regarding the pin 2 and its mandrel 4-4’ as
a standing part of the tool string and as at
tached to a subjacent string or iìshing tool, a
tension placed on the box 32 will be taken by
hammer 29 and from it by the coupling means
here consisting of the linking latches 24 which
are interlocked by the wedge collar 20 against
and under the shell ring 25 of the jacket I5.
40 This therefore takes the tension and pulls up
the barrel 9 and unclutches it from the jaws 2‘
of the pin 2.
"
Now by'right-handing turning of the related
string parts 22, 28, 22, I5 and 6 as to the standing
mandrel 4, the sleeve nut I3 will screw upward
at I4 in the jacket I5 and will compress the
spring to the desired degree.
In order to obtain a jarring impingement of I
the now spaced hammer piston 29 against the
50 superjacent end of the anvil 23, string tension
is applied to the box 32 and to the hammer 29
to a suilicient degree to crowd the toe ends of
the linking latches 24 inwardly from the shoe
ring 26 to clear the latch shoulders 25 there
from. 'I'he inward pressure and movement of
the latch toe ends 24’ overcomes the up-thrust
of the spring I1 on the bolster collar 20, and as
the shoulders 25 of the latches ultimately pass
, into the shoe ring 29 the released hammer snaps
UP. by reason of the tension in the string length
thereabove, and the shoulder 29’ of the piston
29 of the hammer sharply .bounds against the
near end of the anvil 29, Fig. 9. The percussive
shock is transmitted by the connected shell parts
22, I5, I5, 5, 4 and 2 to the tool. attached there
below.
'
'I'he coupling, latch means 24 travel with the
hammer 28 by reason of the interlock at 21, this
being of such nature to allow the lower end of
the latches to swing in or out on the bolster
device 20.
The jarring action may be repeated at will at
' ‘ intervals times only by the period needed to
again lower the mandrel 28 and, by the latches
76 24, repress the yieldable bolster 20 to again set
effective position and adapted to release the
coupling means under a predetermined tension, 30
and permit spring of the hammer to its anvil and
thereby jar the connected mandrel.
2. A jar assembly for well strings, including a
mandrel section, having means to engage a fish,
and hammer and anvil sections relatively splined
together and the anvil section sliding on the man
drel, a coupling device connecting the hammer
and the anvil sections in open hammer relation
for co-reciprocation on the said mandrel, and a
yieldable bolster device having a part axially ad 40
justable on the mandrel and having a spring for
setting the coupling device to connect the ham
mer and the anvil sections and adapted to re
lease the coupling under predetermined tension
thereon between the hammer section and the
anvil section to permit jar action and means
operative by rotation of the anvil section to ad
just the spring.
3. A jar assembly for well strings, including a
mandrel having means to connect to a fish held 50
in a hole, connective, splined and telescopic ham
mer and anvil sections having opposed strike
faces, a collapsible coupler carried by. one of said
sections and releaseably interlockable with the
other in spaced hammer relation, the coupled 55
sections having limit'ed sliding connection with
the mandrel,` means for co-rotatively connecting
the anvil to the mandrel, and a yieldable bolster
mounted in one of the sections-and operative
against the coupler to expand it to interlock said 60
sections until overcome by a predetermined ten
sion between the sections.
4. A jar assembly for well strings, including a
hammer- section and an anvil section slidably
splined thereon and each provided with strike 65
faces for jar action, a collapsible coupler for con
necting the sections in open hammer relation and
being attached to one section for travel there
with, a mandrel having means for attaching to a
ilsh on which the connected sections have limited 70
sliding motionand are rotatable, means to turn
ably interlock the said section to the mandrel at
either of stroke ends, a collar to engage and set
the coupler in connecting position, and a yield
able support'in one of the sections for the collar` 75
3
2,121,267
to move it to coupler setting position and for per
mitting the collar to yield and allow disconnection
of the coupler under given tension between the
said sections.
'
l
_
5. A jar assembly as set forth in claim 4, and
said support having means operative by rotation
of said 4.sections for varying the reaction pressure
` of the said support.
6. A well string jar assembly having slidably
10 splined hammer and anvil sections with opposed
striking faces, al mandrel on which one of said
sections is slidable and turnable and havingmeans
-_.Splined thereon for co-rotation, said section hav
ing mutual striking faces, an axially shiftable
wedge collar and a supporting spring therefor in
the anvil section, a coupler controlled and en
gaged by said collar for tensionally connecting the
hammer and the anvil sections in open hammer
relation, a mandrel, and means axially movable
on the mandrel and carrying, and regulating the
resistance of, the spring and being shiftable by
rotation of the hammer and the anvil sections; 10
said ‘coupler being operative on the collar to
to rotatively interlock therewith'and limit sliding
automatically repress it so as to release the ham
mer from the anvil at a predetermined tension on
motion, coupler means carried by one of the sec
the coupler.
15 tions and collapsibly interlockable with the other
in open hammer position thereof, and an axially
adjustable bolster device for engaging and ex
.
‘
13. A well string jar assembly as set forth in 15
lclaim 12, and in which the collar is repressible by
inward movement of the coupler „to enect auto
pansively setting the coupler in effective position ‘ matic resetting ot the coupler in section connect
and a spring yieldably supporting the tbolster for
20 automatic release of the connected sections under
given tension and permit a snap action of the
hammer to the anvil for jarring.
ing relation'.
‘
»
f`14. A well string jar assembly including slid 20
ably splined, co-rotative hammer and anvil sec
tions having mutual strike faces, a coupler in
7. A well 'jar assembly as set forth in claim‘ß,
and including means operative by the rotation 0l.’
said `sections operatively connected’ to the man
drel and to one of said sections whereby to readily
tions in open hammer relation, an axially yield 25
able bolster means engaging the coupler and
adjust >the degree „ of bolster resistance by said
holding itin expanded connecting position, and
spring to the string tension and thereby the jar
force.
`
o 8. A well string jar assembly including a ham
merv structure and an anvil section slidably splined
. thereto and having a strike face therefor, a cou
pler attached to the hammer and having collapsi
ble engagement with the anvil section to hold it
open as to the hammer, a mandrel structure on
which the anvil section is slidably and turnably
attached and having stop means for rotational
cluding‘dndependent, expansible latch parts for
tensionally and releaseably interlocking the sec
control means including an axially 'shiftable sup
port for the bolster and which is axially opera
tive by_rotation of said sections to vary the re
sistance of the bolster means on the coupler.
15. A well string jar assembly including co
rotative, relatively slidable hammer and anvil sec
tions, a set of link forming latches- each independ
ently, pivotally connected to and reciprocative by 35
one of said sections, a yieldable bolster including
a wedge collar to expand the latches and a spring
interlock therewith, an axially slidable bolster in o
having an axially adjustable support screwed in
the anvil section to expand the coupler to section
connecting position, and a spring yleldably sup
porting said bolster so that it will automaticallyl
release the coupling and disconnect the hammer
the other section. and seating means in one sec
tion and against which the toes of the latches are 40
structure, for jarring impingement on the anvil,
under predetermined string tension on the
coupler.
'
.
9.1 A jar assembly asset forth in claim 8, and
including an adjustable -seat for the spring and
which is axially shiftable by and upon relative ro»
- tation of the hammer and the anvil as lto the
mandrel; said seat being axially shiftable on the
mandrel.
expanded to connect the sections by reaction of
the bolster and which seating means is operative
under given tension on the latches to contract the
latches and releasethe connection of the sections
for rebound of the hammer under tension to jar 45
the anvil section.
l
'
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16. A well jar assembly including the combina
tion as set forth in claim l5, and having means
to non-rotatively hold said support while its sec
tion is rotated for varying the position of the said 50
. seating means and determine the releasing ten- '
,
10. A well string jar assembly including a ham
sion of the interlocked hammer _and anvil sections,
mer and a set o! relatively free latch elements at
and thereby regulate the jar blow while the as
tached thereto and reciprocative thereby, an anvil sembly is in fish attachingposition in a well hole.
section telescoped on the hammer and strikable
17. A well string jar assembly including a ham
thereby, yieldable bolster means for expanding mer section having a set of coupling elements 55
_the latches into interlock with the anvil section to pivotally suspended therefrom and ' reciproca.
connect the hammer thereto in spaced relation tive thereby and therewith, an' anvil section
and whereby to automatically release the hammer splined on the .hammer ' section and strikable
under predetermined tension for rebound against thereby, axially slidable bolster means for ex 60
the anvil, and means operativefby rotation of the panding the plvotedlatches into ’attachment with
anvil section ‘to vary the release resistance of the the anvil section to connect the hammer'in open '
position to the anvil, a spring for supporting the
11.- A jar assembly as set forth in claim 10, and bolster, and means operative by rotation of the'
including a mandrel structure, and the bolster anvil to vary the reaction of the spring on the
means including a wedge collar slidable, on the- bolster; said bolster automatically releasing the .es
said structure, under a straight down stroke of coupling elements under‘a strain according 4vto
the hammer to effect a setting oi.' the said ele
the spring resistance and said bolster acting on a
bolster.
ments.
f
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o
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.
Y.
12. A well string jar _assembly including a ro--
m tary hammer section, an anvil section slidablyv
i
„down stroke of the coupling elements vto re-set
the
_ attachment. ^
DONALD
»Y msnm.,
.
70
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