CA2219893A1 - Threaded coupling, male and female extension members as well as a method of maintaining a threaded coupling - Google Patents
Threaded coupling, male and female extension members as well as a method of maintaining a threaded coupling Download PDFInfo
- Publication number
- CA2219893A1 CA2219893A1 CA002219893A CA2219893A CA2219893A1 CA 2219893 A1 CA2219893 A1 CA 2219893A1 CA 002219893 A CA002219893 A CA 002219893A CA 2219893 A CA2219893 A CA 2219893A CA 2219893 A1 CA2219893 A1 CA 2219893A1
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- Canada
- Prior art keywords
- extension member
- male
- female
- male extension
- groove
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Abandoned
Links
- 230000008878 coupling Effects 0.000 title claims abstract description 89
- 238000010168 coupling process Methods 0.000 title claims abstract description 89
- 238000005859 coupling reaction Methods 0.000 title claims abstract description 89
- 238000000034 method Methods 0.000 title claims description 5
- 238000005553 drilling Methods 0.000 claims abstract description 49
- 229910000639 Spring steel Inorganic materials 0.000 claims description 3
- 238000011010 flushing procedure Methods 0.000 claims description 3
- 229920001971 elastomer Polymers 0.000 description 6
- 230000035939 shock Effects 0.000 description 5
- 150000002500 ions Chemical class 0.000 description 3
- 229910000831 Steel Inorganic materials 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 239000010959 steel Substances 0.000 description 2
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 2
- 101100493631 Mus musculus Bcl2l2 gene Proteins 0.000 description 1
- 229920006311 Urethane elastomer Polymers 0.000 description 1
- 238000005520 cutting process Methods 0.000 description 1
- 238000006073 displacement reaction Methods 0.000 description 1
- 238000001035 drying Methods 0.000 description 1
- 230000002349 favourable effect Effects 0.000 description 1
- 238000003780 insertion Methods 0.000 description 1
- 230000037431 insertion Effects 0.000 description 1
- VAOCPAMSLUNLGC-UHFFFAOYSA-N metronidazole Chemical compound CC1=NC=C([N+]([O-])=O)N1CCO VAOCPAMSLUNLGC-UHFFFAOYSA-N 0.000 description 1
- 239000011435 rock Substances 0.000 description 1
- 238000004018 waxing Methods 0.000 description 1
Classifications
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B17/00—Drilling rods or pipes; Flexible drill strings; Kellies; Drill collars; Sucker rods; Cables; Casings; Tubings
- E21B17/02—Couplings; joints
- E21B17/04—Couplings; joints between rod or the like and bit or between rod and rod or the like
- E21B17/042—Threaded
- E21B17/043—Threaded with locking means
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B17/00—Drilling rods or pipes; Flexible drill strings; Kellies; Drill collars; Sucker rods; Cables; Casings; Tubings
- E21B17/02—Couplings; joints
- E21B17/04—Couplings; joints between rod or the like and bit or between rod and rod or the like
- E21B17/042—Threaded
- E21B17/0426—Threaded with a threaded cylindrical portion, e.g. for percussion rods
Landscapes
- Engineering & Computer Science (AREA)
- Life Sciences & Earth Sciences (AREA)
- Geology (AREA)
- Mining & Mineral Resources (AREA)
- Mechanical Engineering (AREA)
- Physics & Mathematics (AREA)
- Environmental & Geological Engineering (AREA)
- Fluid Mechanics (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Geochemistry & Mineralogy (AREA)
- Earth Drilling (AREA)
Abstract
The present invention relates to a threaded coupling between a female extension member (12) and a male extension member (32) in a drill string for percussive drilling. The female extension member (12) is provided with an internal thread (18) and the male extension member (32) is provided with an external thread (34). The internal and external threads respectively are designed for engagement with each other. The present invention relates to a coupling sleeve (32) that can be safely secured in one (12) of the extension drilling tubes/rods.
Description
W O9'~Q3~ PCTISE9S/0048S
Threaded co~rl ~t~g, male and female e~ctF~-n~iQn O
as well as a method of maint~n~tlE~ a threaded coupling The present invention relates to a threaded coupling b~ Lw~ a female extencion member and a male extension member in a drill string for pc,~;u~ e drilling, 5 said female e~t~ncion memher being provided with an intern~l thread, said maleextension member being provided with an extern~l thread, said intern~l and e~t~rn~l threads lc~e~Liv~ly being (l~cign~l for engagement with each other.
The present invention also relates to the female extension member per se, the male extenci~ n member per se and a method of m~ a coupling bcLw~e 10 a female extension member and a male extension member for ~ e rlrilling Especially for tubes for p~..;ussi~e drilling it is pFeviously known to use so-called male-female thread couplings, i.e. an e~tern~lly threaded spigot, that is15 integral ~,vith a tube element, coo~,ldLes with an int~rn~lly threaded sleeve, that is integral with an ~diacent tube element. When a shock wave reaches the coupling, said shock wave is instantly affected by the (1imenciol~l variations in the coupling, e.g. change in wall thicknesc of the tube element. These variations give rise to reflecting waves that propagate in the tube elennent in the opposite 20 direction of the shock wave. Due to the fact that both the spigot and the sleeve are inteEr~l with the ~ clont tube eletnentc, the abutting thread flanks of the spigot and the sleeve will be subjected to considerable impact when the shock wave is tr~n~mitte-d between the abutting thread flanks. Such an impact n~rm~lly gives rise to wearing and pitting Also previously known are ext~orn~lly threaded coupling sleeves, applied int.orn~lly in ~dj~c~nt ends of two e ctencion tubes. Said coupling sleeves are superior as regards the tr~ncmiccion of impact energy co~ ued to the prior artmale-female couplings mentioned above. Since the intet~n~l coupling sleeve is a 30 s~Udl~ detail it will only be ",a,~""ally affected when the shock wave bypasses the thread coupling. Also the ~limencions~ i.e. the wall thickness, of WO g~ 5038 PCI~ h~s~'~!Ql4~!;
the tubes can be kept constant in the thread coupling. However, one problem with intPrn~lly applied coupling sleeves is that when disconneting two tubes connected by such intern~lly applied coupling sleeves it is impossible to control in which tube the sleeve will remain. This is a great disadvantage in connectionS with ~lltorn~ti7Pd h~n~llin~ of the tubes.
.
From SE-B-470 217 a device for yieldably locking a threaded spigot in a threaded boring is previously known, said device being a ring of urethane rubber that provides a friction action between the spigot and the boring during 10 ~lrilling It has turned out that this device ~ ro~ s well in surface drilling, since the flushing medium normally used is air holding a certain amount of powdered cuttings. This means that the spigotlboring coupling will adopt a relatively high t~ tldl~e and consequently the waxing of the rubber ring will dis~pedl by drying. The rubber ring is almost vnl~ni7ed to the spigot.
When the device according to SE-B-470 217 is used in underground drilling the function is negatively affected, prim~rily due to the fact that water norm~lly is used as fln~hin~ medium. The consequence of using water instead of air is that the temperature of the spigot/boring coupling is lower and the wax remains on 20 the rubber ring. Thus the rubber ring exerts very little friction action upon the spigotlboring coupling. This means that there is no erre~;live control that the int~rn~lly applied sleeve will be m~int~inP~l in a certain tube cle .~ by the rubber ring.
25 A joint for steel pipes for oil transport is previously known through US-A-4 426 105, in which a ring locks male and female parts together. If that joint wasto be used for ~Jel~;US::iiVt; drilling the ring would almost imm~ tely, after acouple of blows, be sheared off along a path colle~onding to the outer h~l~ of the male member. That is bec~use the male m~mber is more 30 axially movable than is the ring.
W O~f'35038 P~l/~S/'~C1~5 One object of the present invention is to present a concept that will work both for surface drilling and underground drilling, i.e. to secure safely the int~rn~lly applied coupling sleeve in one of two adjacent drilling tubes. Another object of~ the present invention is to present a concept wherein the intPrn~lly applied S coupling sleeve is pPrmAnPntly secured in one of two ~rljA~Pnt drilling tubes.
The objects of the invention are realized by a coupling, a coupling sleeve, a female extension member and a method, res~c~;lively, that has been given the char~cteri~tics of the appending claims.
Below, ~l~r~ d embo~limPnt~ of the invention will be described, reference being made to the accompanying drawings wL~,.eill Fig. 1 shows a partly sectioned side view of a coupling according to the present invention beLW~;e11 two tubes for ~c,~;u~ e drilling mounted for drilling purposes; Fig. 2 shows a 15 detail of one end of the coupling sleeve in drilling position; Fig. 2A shows a partly sectioned side view of an ~ltPrn~tive embodiment of a coupling according to the present invention in unscrewing position; Figs. 3a-3c show the locking ring per se; Fig. 4 shows a coupling accordil g to the present invention betweentwo members forming a shank adapter.
A coupling is shown in a mounted position with a non-operative position of locking means in Fig. 1. The coupling inclll(les a first end portion 10 of a first çxtPnxion drilling tube 12 and a second end portion 14 of a second Pxt~Pn~ion drilling tube 16, the free ends of said end portions 10 and 14 abutting each 25 other. The first end portion 10 is provided with a first intPrnAl cylin-lriçAl thread 18 and the second end portion 14 is provided with a second intern~l thread 20.
The first intPrn~l thread 18 is tPrmin~te-l by a first Cil~;u llfc.~;llLial cle~c~ ~ce 22.
30 A(lj~cent to the first çleArAnre 22, but further away from the free end of the end portion 10, an intPrn~l ci~.;u l.fc._llLial first groove 24 is provided, see also Fig.
I
CA 022l9893 l997-lO-30 W 096/35038 PCT/~h~S/~
Threaded co~rl ~t~g, male and female e~ctF~-n~iQn O
as well as a method of maint~n~tlE~ a threaded coupling The present invention relates to a threaded coupling b~ Lw~ a female extencion member and a male extension member in a drill string for pc,~;u~ e drilling, 5 said female e~t~ncion memher being provided with an intern~l thread, said maleextension member being provided with an extern~l thread, said intern~l and e~t~rn~l threads lc~e~Liv~ly being (l~cign~l for engagement with each other.
The present invention also relates to the female extension member per se, the male extenci~ n member per se and a method of m~ a coupling bcLw~e 10 a female extension member and a male extension member for ~ e rlrilling Especially for tubes for p~..;ussi~e drilling it is pFeviously known to use so-called male-female thread couplings, i.e. an e~tern~lly threaded spigot, that is15 integral ~,vith a tube element, coo~,ldLes with an int~rn~lly threaded sleeve, that is integral with an ~diacent tube element. When a shock wave reaches the coupling, said shock wave is instantly affected by the (1imenciol~l variations in the coupling, e.g. change in wall thicknesc of the tube element. These variations give rise to reflecting waves that propagate in the tube elennent in the opposite 20 direction of the shock wave. Due to the fact that both the spigot and the sleeve are inteEr~l with the ~ clont tube eletnentc, the abutting thread flanks of the spigot and the sleeve will be subjected to considerable impact when the shock wave is tr~n~mitte-d between the abutting thread flanks. Such an impact n~rm~lly gives rise to wearing and pitting Also previously known are ext~orn~lly threaded coupling sleeves, applied int.orn~lly in ~dj~c~nt ends of two e ctencion tubes. Said coupling sleeves are superior as regards the tr~ncmiccion of impact energy co~ ued to the prior artmale-female couplings mentioned above. Since the intet~n~l coupling sleeve is a 30 s~Udl~ detail it will only be ",a,~""ally affected when the shock wave bypasses the thread coupling. Also the ~limencions~ i.e. the wall thickness, of WO g~ 5038 PCI~ h~s~'~!Ql4~!;
the tubes can be kept constant in the thread coupling. However, one problem with intPrn~lly applied coupling sleeves is that when disconneting two tubes connected by such intern~lly applied coupling sleeves it is impossible to control in which tube the sleeve will remain. This is a great disadvantage in connectionS with ~lltorn~ti7Pd h~n~llin~ of the tubes.
.
From SE-B-470 217 a device for yieldably locking a threaded spigot in a threaded boring is previously known, said device being a ring of urethane rubber that provides a friction action between the spigot and the boring during 10 ~lrilling It has turned out that this device ~ ro~ s well in surface drilling, since the flushing medium normally used is air holding a certain amount of powdered cuttings. This means that the spigotlboring coupling will adopt a relatively high t~ tldl~e and consequently the waxing of the rubber ring will dis~pedl by drying. The rubber ring is almost vnl~ni7ed to the spigot.
When the device according to SE-B-470 217 is used in underground drilling the function is negatively affected, prim~rily due to the fact that water norm~lly is used as fln~hin~ medium. The consequence of using water instead of air is that the temperature of the spigot/boring coupling is lower and the wax remains on 20 the rubber ring. Thus the rubber ring exerts very little friction action upon the spigotlboring coupling. This means that there is no erre~;live control that the int~rn~lly applied sleeve will be m~int~inP~l in a certain tube cle .~ by the rubber ring.
25 A joint for steel pipes for oil transport is previously known through US-A-4 426 105, in which a ring locks male and female parts together. If that joint wasto be used for ~Jel~;US::iiVt; drilling the ring would almost imm~ tely, after acouple of blows, be sheared off along a path colle~onding to the outer h~l~ of the male member. That is bec~use the male m~mber is more 30 axially movable than is the ring.
W O~f'35038 P~l/~S/'~C1~5 One object of the present invention is to present a concept that will work both for surface drilling and underground drilling, i.e. to secure safely the int~rn~lly applied coupling sleeve in one of two adjacent drilling tubes. Another object of~ the present invention is to present a concept wherein the intPrn~lly applied S coupling sleeve is pPrmAnPntly secured in one of two ~rljA~Pnt drilling tubes.
The objects of the invention are realized by a coupling, a coupling sleeve, a female extension member and a method, res~c~;lively, that has been given the char~cteri~tics of the appending claims.
Below, ~l~r~ d embo~limPnt~ of the invention will be described, reference being made to the accompanying drawings wL~,.eill Fig. 1 shows a partly sectioned side view of a coupling according to the present invention beLW~;e11 two tubes for ~c,~;u~ e drilling mounted for drilling purposes; Fig. 2 shows a 15 detail of one end of the coupling sleeve in drilling position; Fig. 2A shows a partly sectioned side view of an ~ltPrn~tive embodiment of a coupling according to the present invention in unscrewing position; Figs. 3a-3c show the locking ring per se; Fig. 4 shows a coupling accordil g to the present invention betweentwo members forming a shank adapter.
A coupling is shown in a mounted position with a non-operative position of locking means in Fig. 1. The coupling inclll(les a first end portion 10 of a first çxtPnxion drilling tube 12 and a second end portion 14 of a second Pxt~Pn~ion drilling tube 16, the free ends of said end portions 10 and 14 abutting each 25 other. The first end portion 10 is provided with a first intPrnAl cylin-lriçAl thread 18 and the second end portion 14 is provided with a second intern~l thread 20.
The first intPrn~l thread 18 is tPrmin~te-l by a first Cil~;u llfc.~;llLial cle~c~ ~ce 22.
30 A(lj~cent to the first çleArAnre 22, but further away from the free end of the end portion 10, an intPrn~l ci~.;u l.fc._llLial first groove 24 is provided, see also Fig.
I
CA 022l9893 l997-lO-30 W 096/35038 PCT/~h~S/~
2, said first groove 24 receiving a locking ring 25, preferably made out of spring steel. As can be learnt from Figs. 3a and 3b the locking ring 25 has a circumferential gap 27 of a certain width. Due to the gap 27 it is possible to reduce the diameter of the locking ring 25 when mounting said locking ring 25 in the first groove 24. Still further away from the free end of the end portion 10 a first reskictiQn 23 is provided, said reskiction 23 forming a first shoulder 29, the function of which will be described below.
The second int~rn~l cylindrical thread 20 is also t~rmin~tP~l by a second clearance 26 that in its turn is termin~te~l by a second reskiction 28, said second reskiction 28 forming a second shoulder 30, the function of which will be described below.
The coupling according to the present invention also includes an internal coupling sleeve 32 that is provided with an e~tem~l cylindrical thread 34. The coupling sleeve 32 has a lon~it~ in~l~ through-going, internal boring 36 to allow flushing mç~ m to bypass the coupling. As can be seen in Fig. 1 the wall thickn~c~ of the coupling sleeve 32 co~tin~ n~ly increases from both ends towards an int.~rme~ te portion of the coupling sleeve 32. In the int~rme~ tç
portion the wall thickness of the coupling sleeve 32 is constant. At one end of the coupling sleeve 32 an t-xt~m~l second circurnferential groove 38, see Fig. 2, is provided. The free end of the coupling sleeve 32 ~ cçnt to the second groove 38 is in the shape of a first bevelled portion 40. Between the first bevelled portion 40 and the second groove 38 a cylinrlric~l portion 39 is provided. At the opposite end the coupling sleeve 32 also has a free end in the shape of a second bevelled portion 42.
In order to safely secure the coupling sleeve 32 in the first drilling tube 12 the end of the coupling sleeve 32 carrying the second groove 38 is threaded into the end portion 10 of the first drilling tube 12, i.e. the e~t~ms~l thread 34 of the coupling sleeve 32 engages the first internal thread 18 of the first drilling tube W O~f~3~ SJ~
12. When the first bevelled portion 40 ~ ctont to the second groove 38 contacts the locking ring 25, said bevelled portion 40 forces the ring 25 against the far side wall 24a of the first groove 24, seen in the direction of displacement of the coupling sleeve 32. Further displ~r~ment inwardly of the coupling sleeve 32, i.e. to the left in Fig. 1, will expand the ring 25 due to the circurnferential gap. The ring 25 will climb the bevelled portion 40 further as the coupling sleeve 32 is displaced inwardly. Eventually, the locking ring 25 reaches the cylin~lric~l portion 39 b~,lw~ - the bevelled portion 40 and the second groove 38. The locking ring 25 byp~ses also said cylindrical portion 39 when the coupling sleeve 32 is displaced further inwardly and finally the locking ring 25 reaches the second groove 38 and is snapped into said second groove 38. The locking ring 25 is now safely secured in the second groove 38.
The play bclwccll the width of the groove 38 and the width W of the ring 25, see Fig. 3c, is preferably about 10% of the width of the groove 38. Preferably, the thickn~s~ T of the lock~ng ring 25, see Fig. 3c, is about half the width W.
The thicL n~e~ T of the locking ring 25 exceerl~ the depth of the second groove 38, i.e. when the locking ring 25 is ~ ly mounted in the second groove 38 the locking ring 25 loYt~-n~ki beyond the outer periphery of the adjacent end ofthe coupling sleeve 32. As is evident from Fig. 1 the locking ring 25 will neverabut the side walls 24a and 24b of the first groove 24 when the coupling sleeve 32 is ~ pl~cecl loI git~ innlly in either direction during ~lrilling This means that the axial play L1 1)CLWCC11 the sleeve 32 and the female parts 12 and 16 is smaller than the axial extension L2 of the groove 24. Thus, the coupling sleeve 32 is p~o~ ly secured in the first end portion 10 of the first drilling tube 12.However during U~lSclc~ g of the coupling the ring will move axially the lliet~n~e L2 and contact the side wall 24b and thus stop further UllSc~ g of tha tparticular end of the male eYton~i( n member so that further ~scl~ g will take place at the axially opposite end of the male ~t~n~ion member.
~ In Fig. 2 an hltern~tive cross-section of the locking ring 25 is shown with W O9''3~0~ PCT/~hg5~Q48 dotted lines. In such a case the side wall 24b should be inclin~d in accordance with the dotted straight line. By such an arrangement the inclined side wall will force the locking ring 25 down into the second groove 38 when contact is established between said locking ring 25 and said inclined side wall.
s When the coupling sleeve 32 is ~loptlly secured in the first drilling tube 12 about half the length of the coupling sleeve 32 projects from said first drilling tube 12. To couple together the first drilling tube 12 and the second drilling tube 16, said second drilling tube 16 is threaded on the coupling sleeve 32, i.e.
10 the int~rn~l thread 20 of the second drilling tube 16 engages the ~xtçrn:~l thread 34 of the coupling sleeve 32. When the free ends of the first and second drilling tubes 12 and 16, respectively, abut each other a proper coupling is established and the percussive energy is transfered between adjacent drilling tubes 12 and 16 through the abutting free ends.
The first and second shoulders 29 and 30, l~sL,e-;Li~ely, col ~tit~lte longit~l~lin~
stops for the ends of the internal coupling sleeve 32. These shoulders prevent the ring from being cont~rt~d by the first drilling tube 12, since the ring cannot stand many blows during drilling. ~ltern~tively the stops could be made at 20 another part, i.e. close to the free end of the first drilling tube 12.
Within the scope of the present invention it is possible to mount a ring of u~ ~le rubber accordLIg to SE-B-470 217 in the clearance 22. An additional securing of the coupling sleeve 32 is thus achieved, at least for surface tlrilling Another favourable feature of the present invention is that it is possible to use dirrt;l~;,lL m~teri~l~ or m~tPri~l~ of dirr~.e.lL heat tre~tm~nt in the drilling tubes 12 and 16 on the one hand and the coupling sleeve 32 on the other hand. Such an arrangement o~Lhlli~s the life of the coupling since the drilling tubes 12 and 30 16 are subjected to a faster wearing, i.e. both the ~xt~rn~l ~ .;pll. ;es and the int~rn~l threads 18 and 20, res~e.iLively. Therefore, the material in the coupling W 096/35038 PCT/~5S~'~0~8S
sleeve 32 should preferably be softer than the material in the drilling tubes 12and 16.
In Fig. 2A an ~ltern~tive embodirnent of a concept according to the present S invention is shown. A coupling is shown during ullsc~ vhlg with an operative position of locking means. The threads 18' and 20' is in principle cleei~n~l in a way corresponding to the threads 18 and 20, lc;,~e-;Li~ely, disclosed in Figs. 1and 2 of the present application.
However in this embodiment the first internal thread 18' is not Ir~ 1 in a clearance but in a mainly cylin-iric~l surface 22', preferably ece.onti~lly coinciding with the smallest diameter of the thread 18'. Adj~ent to the cylindrical surface 22', but further away from the free end of the end portion of the first drilling tube 12', an int~rn~l circumferential first groove 24' is provided. The first groove 24' receives a locking ring 25', preferably made of steel such as a spring steel, (lecignP~l similar to the ring 25 described in cormection with Figs. 2, 3a and 3b, but with convex side walls. The ring may ~lt~rn~tively have a round or square cross-section and then the conn~cte~l grooves should be adapted thereto. At one end of the coupling sleeve 32' an external second circumferential groove 38' is provided. The free end of the coupling sleeve 32' ~ tont to the second groove 38' is in the shape of a first bevelled portion 40'. Between the first bevelled portion 40' and the second groove 38' a cylindrical portion 39' is provided. At the opposite end the coupling sleeve 32' also has a free end in the shape of a bevelled portion. The bottom of the groove 38' compriees a first portion 138' of generally smaller met~r than a second portion 238' thereof. The first portion 138' is arranged at a larger ~liet~n~e from the free end of the sleeve 32' than is the second portion 238'. The second portion 238' sucessiveiy reduces the radial depth from the first portion to the cylindrical portion 39' via a wedge or r~ leee~1 shape.~lt~ rely the second portion may be cylin-lric~l but with a greater radius than the first portion.
W Og6/~3~ PCT/SE95/00485 The thickness of the locking ring 25' is smaller or mainly similar to the depth of the first portion 138' of the second groove 38', i.e. when the locking ring 25' is properly mounted in the second groove 38' the locking ring 25' falls radially below or is mainly flush with the outer periphery of the adjacent S cylindrical surface 139' of the coupling sleeve 32'. As is evident from Fig. 2A
the locking ring 25' will abut the side walls of the first groove 24' when the coupling sleeve 32' is ~li~l~re(l longitudinally in either direction. Thus, the coupling sleeve 32' is ,~,lo~ e-ly secured in the first end portion of the firstdrilling tube 12'. The play between the width of the groove 24' and the width of the ring 25' is preferably about 10% of the width of the groove 24'.
Preferably, the thickness of the locking ring 25', see Fig. 3c, is about half the width. The width of the groove 38' is at least 50 % larger than the width of thering 25'.
IS The thickness of the locking ring 25' exceeds the depth of the second groove portion 238', i.e. when the locking ring 25' is plop~lly mounted in the second groove 38' the locking ring 25 extends generally beyond the outer periphery 39' and 139' of the ~ cent end of the coupling sleeve 32' after having been co~ lessed into groove portion 138'. The sleeve 32' is axially movable a 20 ~ t~n~e L2' relative to the tube 12' during ulls~ g of the coupling. The t~nre L2' is larger than the distance Ll, described in cormection with the former embo-lim~nt That is to avoid blows on the locking means during drilling.
25 In order to safely secure the coupling sleeve 32' in the first drilling tube 12' the end of the coupling sleeve 32', carrying the second groove 38' in which the ring 24' is accomodated in the deeper first portion 138', is threaded into the end portion of the first drilling tube 12', i.e. the ~t~ l thread of the coupling sleeve 32' engages the first internal thread of the first drilling tube 12'. When 30 the radially outer periphery of the ring, in colllplessed state, contacts theint~rn~l thread the ring will remain in the portion 138' until it is allowed to W O~,13C~ PcT/~
~ n~l F.xr~n~ior~ occurs when the ring reaches the first groove 24' and further insertion of the sleeve will became impossible due to cooperation of theside wall of the groove 24', the ring 25' and a side wall 338' of the groove 38'. The ring 25' has two positions in the groove 38', that is the assembly 5 position in radially com~lcssed state at the portion 138' and a locking position when the ring has snapped into the groove 24'. When the ring is in the groove 24' and the sleeve is screwed axially outwardly towards the free end of the first end portion the second portion 238' will wedge up against the ring as in Fig.
2A to prevent further outwardly directed movement of the sleeve 32'. The 10 sleeve however, may move axially in the opposite direction a ~ t~nee generally corresponding to the axial extension of the portion 138'. Once the ring has snapped into the groove 24' it will be stuck therein preferably still in a colllplessed state and will provide a ~ lock for the sleeve 32'. By the term ~'pçrrn~nPnt~ or "pe~n~nPntly" is meant that the ring cannot be dismounted 15 without de~Llvyillg the ring, for e~mrle by tllrnin~- The second portion 238' of the groove may instead of a being defined by a wedging conical shape or a radiussed section, be cylindrical but with a larger radius than the first portion 138'. That is to provide for just enough space for the ring between the parts 12' and 32' and to additionally secure the ring in the groove 24'. Thus, the 20 coupling sleeve 32' is pçrm~nPntly secured in the first end portion of the first drilling tube 12'.
Although the embotliment~ according to Figs. 1, 2 and 2A refer to a threaded coupling between two tubes in a drill string the threaded coupling according to 25 the present invention also is applicable in a threaded coupling 1)C;LW~;;e11 a tube/rod and a drill bit for percussive ~lrillinp In Fig. 4 a shank adapter 44 is ~liclose~l said shank adapter incl~ ing two sepa~dl~ parts, i.e. a shank part 46 and a sleeve part 48. The shank part 46 is at 30 one end provided with a boring 50 having an int~rn~l thread 51 and at the other end with a head portion carrying splines 52, said head portion being adapted to be inserted in a top h~mmer rock drilling m~hine. The internal thread 51 is in principle cleci~nP~l in a way corresponding to the internal thread 18 disclosed in Figs. 1 and 2 of the present application.
5 The sleeve part 48 is provided with an ~xt~rn~l thread 54 adapted to be in engagement with the internal thread 51 of the boring 50 when the shank adapter 44 is in working condition. The çxt~rn~l thread 54 extends along the entire length of the sleeve part 48 and preferably the external thread 54 has the sarnedesign along the entire length of the sleeve part 48. The sleeve part 48 is 10 further provided with a through-going internal boring 56 that is clesign~l in a way corresponding to the internal boring 36 of the coupling sleeve 32 of the embodiment of Figs. 1 and 2 of the present application. In the area of the end of the sleeve part 48 that is inserted into the boring 50 means are provided foraxially locking the sleeve part 48 in the boring 50. Said means in principle 15 co,~ ol,d to the axially locking means of the embodiment according to Figs. 1and 2 of the present application, i.e. said inserted end of the sleeve part 48 is provided with a locking ring 58 that is mounted in a circumferential groove 60 of the boring 50. When the inserted end of the sleeve part 48 reaches the locking ring 58 said ring will also cooperate with a circumferential groove on 20 the sleeve part 48. In principle the axially locking of the sleeve part 48 in the boring 50 is effected in a way collG~ollding to the axially locking of the coupling sleeve 32 in the first end portion 10 of the first drilling tube 12 according to the embodiment shown in Figs. 1 and 2 of the present application.
Thc~,rore, in t,hat respect reference is made to relevant portions of the 25 description of the present application.
The t~t~rn~l thread 54 of t,he end of the sleeve part 48 protruding from the shank part 46 is in working condition connecte~l with an intern~l thread of a first tube/rod of a drill string for pe.~;ussiv-e ~lrillin~ Thereby the free end of 30 the shank part 46 abuts the free end of the first tube/rod and the pel~;ùs~i~e energy is transferred via said abutting ends, i.e. the transfer of pc~;us~ive WO 9fiJ~5~X PCT/SE9SI0048S
energ,v is effected in the same way ~ for the embodiment according to Figs. 1 and 2 of the present application.
'' Common for the above-described embodiments of the present invention is that 5 when ul~s~ilc~ing the male extension member from the female extension member, the male.~lrten~ion member moves a limited ~ t~nre relative to the female extension member until it is stopped by means 24,25,38;24',25'38' for axially locking the male exten~iorl member 32;32';48. This means that the male extension member during drilling is movable a first ~ t~nee Ll relative to the female extension member 12;12';46 and that the means 24,25,38;24',25'38' are ol el~live during ~ scLc~ving when the male extension member is moved a second distance L2;L2' relative to the female extension member, wherein said first distance Ll is smaller than said second rli~nee L2;L2'.
The second int~rn~l cylindrical thread 20 is also t~rmin~tP~l by a second clearance 26 that in its turn is termin~te~l by a second reskiction 28, said second reskiction 28 forming a second shoulder 30, the function of which will be described below.
The coupling according to the present invention also includes an internal coupling sleeve 32 that is provided with an e~tem~l cylindrical thread 34. The coupling sleeve 32 has a lon~it~ in~l~ through-going, internal boring 36 to allow flushing mç~ m to bypass the coupling. As can be seen in Fig. 1 the wall thickn~c~ of the coupling sleeve 32 co~tin~ n~ly increases from both ends towards an int.~rme~ te portion of the coupling sleeve 32. In the int~rme~ tç
portion the wall thickness of the coupling sleeve 32 is constant. At one end of the coupling sleeve 32 an t-xt~m~l second circurnferential groove 38, see Fig. 2, is provided. The free end of the coupling sleeve 32 ~ cçnt to the second groove 38 is in the shape of a first bevelled portion 40. Between the first bevelled portion 40 and the second groove 38 a cylinrlric~l portion 39 is provided. At the opposite end the coupling sleeve 32 also has a free end in the shape of a second bevelled portion 42.
In order to safely secure the coupling sleeve 32 in the first drilling tube 12 the end of the coupling sleeve 32 carrying the second groove 38 is threaded into the end portion 10 of the first drilling tube 12, i.e. the e~t~ms~l thread 34 of the coupling sleeve 32 engages the first internal thread 18 of the first drilling tube W O~f~3~ SJ~
12. When the first bevelled portion 40 ~ ctont to the second groove 38 contacts the locking ring 25, said bevelled portion 40 forces the ring 25 against the far side wall 24a of the first groove 24, seen in the direction of displacement of the coupling sleeve 32. Further displ~r~ment inwardly of the coupling sleeve 32, i.e. to the left in Fig. 1, will expand the ring 25 due to the circurnferential gap. The ring 25 will climb the bevelled portion 40 further as the coupling sleeve 32 is displaced inwardly. Eventually, the locking ring 25 reaches the cylin~lric~l portion 39 b~,lw~ - the bevelled portion 40 and the second groove 38. The locking ring 25 byp~ses also said cylindrical portion 39 when the coupling sleeve 32 is displaced further inwardly and finally the locking ring 25 reaches the second groove 38 and is snapped into said second groove 38. The locking ring 25 is now safely secured in the second groove 38.
The play bclwccll the width of the groove 38 and the width W of the ring 25, see Fig. 3c, is preferably about 10% of the width of the groove 38. Preferably, the thickn~s~ T of the lock~ng ring 25, see Fig. 3c, is about half the width W.
The thicL n~e~ T of the locking ring 25 exceerl~ the depth of the second groove 38, i.e. when the locking ring 25 is ~ ly mounted in the second groove 38 the locking ring 25 loYt~-n~ki beyond the outer periphery of the adjacent end ofthe coupling sleeve 32. As is evident from Fig. 1 the locking ring 25 will neverabut the side walls 24a and 24b of the first groove 24 when the coupling sleeve 32 is ~ pl~cecl loI git~ innlly in either direction during ~lrilling This means that the axial play L1 1)CLWCC11 the sleeve 32 and the female parts 12 and 16 is smaller than the axial extension L2 of the groove 24. Thus, the coupling sleeve 32 is p~o~ ly secured in the first end portion 10 of the first drilling tube 12.However during U~lSclc~ g of the coupling the ring will move axially the lliet~n~e L2 and contact the side wall 24b and thus stop further UllSc~ g of tha tparticular end of the male eYton~i( n member so that further ~scl~ g will take place at the axially opposite end of the male ~t~n~ion member.
~ In Fig. 2 an hltern~tive cross-section of the locking ring 25 is shown with W O9''3~0~ PCT/~hg5~Q48 dotted lines. In such a case the side wall 24b should be inclin~d in accordance with the dotted straight line. By such an arrangement the inclined side wall will force the locking ring 25 down into the second groove 38 when contact is established between said locking ring 25 and said inclined side wall.
s When the coupling sleeve 32 is ~loptlly secured in the first drilling tube 12 about half the length of the coupling sleeve 32 projects from said first drilling tube 12. To couple together the first drilling tube 12 and the second drilling tube 16, said second drilling tube 16 is threaded on the coupling sleeve 32, i.e.
10 the int~rn~l thread 20 of the second drilling tube 16 engages the ~xtçrn:~l thread 34 of the coupling sleeve 32. When the free ends of the first and second drilling tubes 12 and 16, respectively, abut each other a proper coupling is established and the percussive energy is transfered between adjacent drilling tubes 12 and 16 through the abutting free ends.
The first and second shoulders 29 and 30, l~sL,e-;Li~ely, col ~tit~lte longit~l~lin~
stops for the ends of the internal coupling sleeve 32. These shoulders prevent the ring from being cont~rt~d by the first drilling tube 12, since the ring cannot stand many blows during drilling. ~ltern~tively the stops could be made at 20 another part, i.e. close to the free end of the first drilling tube 12.
Within the scope of the present invention it is possible to mount a ring of u~ ~le rubber accordLIg to SE-B-470 217 in the clearance 22. An additional securing of the coupling sleeve 32 is thus achieved, at least for surface tlrilling Another favourable feature of the present invention is that it is possible to use dirrt;l~;,lL m~teri~l~ or m~tPri~l~ of dirr~.e.lL heat tre~tm~nt in the drilling tubes 12 and 16 on the one hand and the coupling sleeve 32 on the other hand. Such an arrangement o~Lhlli~s the life of the coupling since the drilling tubes 12 and 30 16 are subjected to a faster wearing, i.e. both the ~xt~rn~l ~ .;pll. ;es and the int~rn~l threads 18 and 20, res~e.iLively. Therefore, the material in the coupling W 096/35038 PCT/~5S~'~0~8S
sleeve 32 should preferably be softer than the material in the drilling tubes 12and 16.
In Fig. 2A an ~ltern~tive embodirnent of a concept according to the present S invention is shown. A coupling is shown during ullsc~ vhlg with an operative position of locking means. The threads 18' and 20' is in principle cleei~n~l in a way corresponding to the threads 18 and 20, lc;,~e-;Li~ely, disclosed in Figs. 1and 2 of the present application.
However in this embodiment the first internal thread 18' is not Ir~ 1 in a clearance but in a mainly cylin-iric~l surface 22', preferably ece.onti~lly coinciding with the smallest diameter of the thread 18'. Adj~ent to the cylindrical surface 22', but further away from the free end of the end portion of the first drilling tube 12', an int~rn~l circumferential first groove 24' is provided. The first groove 24' receives a locking ring 25', preferably made of steel such as a spring steel, (lecignP~l similar to the ring 25 described in cormection with Figs. 2, 3a and 3b, but with convex side walls. The ring may ~lt~rn~tively have a round or square cross-section and then the conn~cte~l grooves should be adapted thereto. At one end of the coupling sleeve 32' an external second circumferential groove 38' is provided. The free end of the coupling sleeve 32' ~ tont to the second groove 38' is in the shape of a first bevelled portion 40'. Between the first bevelled portion 40' and the second groove 38' a cylindrical portion 39' is provided. At the opposite end the coupling sleeve 32' also has a free end in the shape of a bevelled portion. The bottom of the groove 38' compriees a first portion 138' of generally smaller met~r than a second portion 238' thereof. The first portion 138' is arranged at a larger ~liet~n~e from the free end of the sleeve 32' than is the second portion 238'. The second portion 238' sucessiveiy reduces the radial depth from the first portion to the cylindrical portion 39' via a wedge or r~ leee~1 shape.~lt~ rely the second portion may be cylin-lric~l but with a greater radius than the first portion.
W Og6/~3~ PCT/SE95/00485 The thickness of the locking ring 25' is smaller or mainly similar to the depth of the first portion 138' of the second groove 38', i.e. when the locking ring 25' is properly mounted in the second groove 38' the locking ring 25' falls radially below or is mainly flush with the outer periphery of the adjacent S cylindrical surface 139' of the coupling sleeve 32'. As is evident from Fig. 2A
the locking ring 25' will abut the side walls of the first groove 24' when the coupling sleeve 32' is ~li~l~re(l longitudinally in either direction. Thus, the coupling sleeve 32' is ,~,lo~ e-ly secured in the first end portion of the firstdrilling tube 12'. The play between the width of the groove 24' and the width of the ring 25' is preferably about 10% of the width of the groove 24'.
Preferably, the thickness of the locking ring 25', see Fig. 3c, is about half the width. The width of the groove 38' is at least 50 % larger than the width of thering 25'.
IS The thickness of the locking ring 25' exceeds the depth of the second groove portion 238', i.e. when the locking ring 25' is plop~lly mounted in the second groove 38' the locking ring 25 extends generally beyond the outer periphery 39' and 139' of the ~ cent end of the coupling sleeve 32' after having been co~ lessed into groove portion 138'. The sleeve 32' is axially movable a 20 ~ t~n~e L2' relative to the tube 12' during ulls~ g of the coupling. The t~nre L2' is larger than the distance Ll, described in cormection with the former embo-lim~nt That is to avoid blows on the locking means during drilling.
25 In order to safely secure the coupling sleeve 32' in the first drilling tube 12' the end of the coupling sleeve 32', carrying the second groove 38' in which the ring 24' is accomodated in the deeper first portion 138', is threaded into the end portion of the first drilling tube 12', i.e. the ~t~ l thread of the coupling sleeve 32' engages the first internal thread of the first drilling tube 12'. When 30 the radially outer periphery of the ring, in colllplessed state, contacts theint~rn~l thread the ring will remain in the portion 138' until it is allowed to W O~,13C~ PcT/~
~ n~l F.xr~n~ior~ occurs when the ring reaches the first groove 24' and further insertion of the sleeve will became impossible due to cooperation of theside wall of the groove 24', the ring 25' and a side wall 338' of the groove 38'. The ring 25' has two positions in the groove 38', that is the assembly 5 position in radially com~lcssed state at the portion 138' and a locking position when the ring has snapped into the groove 24'. When the ring is in the groove 24' and the sleeve is screwed axially outwardly towards the free end of the first end portion the second portion 238' will wedge up against the ring as in Fig.
2A to prevent further outwardly directed movement of the sleeve 32'. The 10 sleeve however, may move axially in the opposite direction a ~ t~nee generally corresponding to the axial extension of the portion 138'. Once the ring has snapped into the groove 24' it will be stuck therein preferably still in a colllplessed state and will provide a ~ lock for the sleeve 32'. By the term ~'pçrrn~nPnt~ or "pe~n~nPntly" is meant that the ring cannot be dismounted 15 without de~Llvyillg the ring, for e~mrle by tllrnin~- The second portion 238' of the groove may instead of a being defined by a wedging conical shape or a radiussed section, be cylindrical but with a larger radius than the first portion 138'. That is to provide for just enough space for the ring between the parts 12' and 32' and to additionally secure the ring in the groove 24'. Thus, the 20 coupling sleeve 32' is pçrm~nPntly secured in the first end portion of the first drilling tube 12'.
Although the embotliment~ according to Figs. 1, 2 and 2A refer to a threaded coupling between two tubes in a drill string the threaded coupling according to 25 the present invention also is applicable in a threaded coupling 1)C;LW~;;e11 a tube/rod and a drill bit for percussive ~lrillinp In Fig. 4 a shank adapter 44 is ~liclose~l said shank adapter incl~ ing two sepa~dl~ parts, i.e. a shank part 46 and a sleeve part 48. The shank part 46 is at 30 one end provided with a boring 50 having an int~rn~l thread 51 and at the other end with a head portion carrying splines 52, said head portion being adapted to be inserted in a top h~mmer rock drilling m~hine. The internal thread 51 is in principle cleci~nP~l in a way corresponding to the internal thread 18 disclosed in Figs. 1 and 2 of the present application.
5 The sleeve part 48 is provided with an ~xt~rn~l thread 54 adapted to be in engagement with the internal thread 51 of the boring 50 when the shank adapter 44 is in working condition. The çxt~rn~l thread 54 extends along the entire length of the sleeve part 48 and preferably the external thread 54 has the sarnedesign along the entire length of the sleeve part 48. The sleeve part 48 is 10 further provided with a through-going internal boring 56 that is clesign~l in a way corresponding to the internal boring 36 of the coupling sleeve 32 of the embodiment of Figs. 1 and 2 of the present application. In the area of the end of the sleeve part 48 that is inserted into the boring 50 means are provided foraxially locking the sleeve part 48 in the boring 50. Said means in principle 15 co,~ ol,d to the axially locking means of the embodiment according to Figs. 1and 2 of the present application, i.e. said inserted end of the sleeve part 48 is provided with a locking ring 58 that is mounted in a circumferential groove 60 of the boring 50. When the inserted end of the sleeve part 48 reaches the locking ring 58 said ring will also cooperate with a circumferential groove on 20 the sleeve part 48. In principle the axially locking of the sleeve part 48 in the boring 50 is effected in a way collG~ollding to the axially locking of the coupling sleeve 32 in the first end portion 10 of the first drilling tube 12 according to the embodiment shown in Figs. 1 and 2 of the present application.
Thc~,rore, in t,hat respect reference is made to relevant portions of the 25 description of the present application.
The t~t~rn~l thread 54 of t,he end of the sleeve part 48 protruding from the shank part 46 is in working condition connecte~l with an intern~l thread of a first tube/rod of a drill string for pe.~;ussiv-e ~lrillin~ Thereby the free end of 30 the shank part 46 abuts the free end of the first tube/rod and the pel~;ùs~i~e energy is transferred via said abutting ends, i.e. the transfer of pc~;us~ive WO 9fiJ~5~X PCT/SE9SI0048S
energ,v is effected in the same way ~ for the embodiment according to Figs. 1 and 2 of the present application.
'' Common for the above-described embodiments of the present invention is that 5 when ul~s~ilc~ing the male extension member from the female extension member, the male.~lrten~ion member moves a limited ~ t~nre relative to the female extension member until it is stopped by means 24,25,38;24',25'38' for axially locking the male exten~iorl member 32;32';48. This means that the male extension member during drilling is movable a first ~ t~nee Ll relative to the female extension member 12;12';46 and that the means 24,25,38;24',25'38' are ol el~live during ~ scLc~ving when the male extension member is moved a second distance L2;L2' relative to the female extension member, wherein said first distance Ll is smaller than said second rli~nee L2;L2'.
Claims (10)
1. Threaded coupling between a female extension member (12;12';46) and a male extension member (32;32';48) in a drill string for percussive drilling, said female extension member (12;12';46) being provided with an internal thread (18,51), said male extension member (32;32';48) being provided with an external thread (34;54), said internal and external threads respectively being designed for engagement with each other, c h a r a c t e r i z e d in that the female extension member (12;12';46) and the male extension member (32;32';48) are provided with means (24,25,38;24',25'38') for axially locking the male extension member (32;32';48) to the female extension member (12;12';46) when the drill string is dismounted and that said means is substantially non-operative during drilling.
2. Threaded coupling according to claim 1, c h a r a c t e r i z e d in that the male extension member (32;32';48) during drilling is movable a first distance (L1) relative to the female extension member (12;12';46) and that the means (24,25,38;24',25'38') are operative during unscrewing when the male extension member is moved a second distance (L2;L2') relative to the female extension member, wherein said first distance is smaller than said second distance and that the male extension member is in the shape of a coupling sleeve (32;32';48) and that in the area of the end carrying locking means is provided with a first portion (24b;238';60) for engagement with the locking ring during dismounting of the drill string and that the locking means include an internal first circumferential groove (24;24';60) that is provided in the femaleextension member (12;12';46), a locking ring (25;25';58) mounted in said first groove (24;24';60) and an external second circumferential groove (38;38') that is provided in said male extension member (32;32';48) in the area of one end of said male extension member (32;32';48).
3. Threaded coupling according to claim 1 or 2, c h a r a c t e r i z e d in that when mounted the male member has a limited axial mobility relative to the female member and that the locking ring (25;25';58) is provided with a circumferential gap (27) having a certain width.
4. Threaded coupling according to claim 2 or 3, c h a r a c t e r i z e d in that the locking ring (25;25';58) is made out of spring steel.
5. Male extension member (32;32';48) for effecting a threaded coupling between the member itself and a female extension member (12;12';46), said male extensionmember (32;32';48) having a longitudinal through-going boring (36;56) for flushing medium and an external thread (34;54) for cooperation with an internal thread (18;51) of said female extension member (12;12';46) c h a r a c t e r i z e d in that the male extension member (32;32';48) in the area of its one end is provided with an external second circumferential groove (38;38') and that in the area of the end carrying locking means is provided with a secondportion (40;23 8') beveled or radiussed so as to radially decrease a distance to an outer periphery of said end.
6. Male extension member according to claim 5, c h a r a c t e r i z e d in that the male extension member is in the shape of acoupling sleeve (32;32';48) and that in mounted position of the male extension member (32;32') in the female extension member (12;12') the second groove (38;38') accommodates a locking ring (25; 75'), the depth of said second groove is at least partly less than the thickness of the locking ring.
7. Male extension member according to claim 5 or 6, c h a r a c t e r i z e d in that the second groove (38') comprises a first portion (138') of generally smaller diameter than a second portion (238') thereof and that the first portion (138') is arranged at a larger distance from a free end of the male member (32') than is the second portion (238') and that the second portion (238') successively reduces the radial depth from the first portion to a cylindrical portion (39') of the male member via a wedge or radiussed shape.
8. Male extension member according to any of claims 5- 7, c h a r a c t e r i z e d in that the wall thickness of the male extension member (32;32';48) increases from both ends to an intermediate portion of the male extension member (32;32';48).
9. Female extension member (12;12';46) for effecting a threaded coupling betweenthe member itself and a male extension member (32;32';48), said female extensionmember (12;121;46) having a boring provided with an internal thread (18;51) for cooperation with an external thread (34;54) of the male extension member (32;32';48), said female member having first (10) and second (14) ends, c h a r a c t e r i z e d in that at the inner end of the boring (S l) in the first end (10) a circumferential groove (24;24';60) is provided and that said groove is provided to be substantially non-operative during drilling.
10. Method of maintaining a coupling between a female extension member (12;12';46) for percussive drilling with a male extension member (32;32';48) forpercussive drilling, said coupling being effected by engagement between an internal thread of the female extension member (12;12';46) and an external thread of the male extension member (32;32';48), c h a r a c t e r i z e d in that when unscrewing the male extension member fromthe female extension member, the male extension member moves a limited distance relative to the female extension member until it is stopped by means (24,25,38;24',25'38') for axially locking the male extension member (32;32';48).
Priority Applications (6)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| SE9304189A SE507097C2 (en) | 1993-12-17 | 1993-12-17 | Threaded union between female and male coupling parts in drill train for striking drilling |
| CA002219893A CA2219893A1 (en) | 1993-12-17 | 1995-05-04 | Threaded coupling, male and female extension members as well as a method of maintaining a threaded coupling |
| PCT/SE1995/000485 WO1996035038A1 (en) | 1993-12-17 | 1995-05-04 | Threaded coupling, male and female extension members as well as a method of maintaining a threaded coupling |
| EP95922807A EP0824627B1 (en) | 1995-05-04 | 1995-05-04 | Threaded coupling, male and female extension members as well as a method of maintaining a threaded coupling |
| AU27557/95A AU709840B2 (en) | 1995-05-04 | 1995-05-04 | Threaded coupling, male and female extension members as well as a method of maintaining a threaded coupling |
| FI974117A FI974117A0 (en) | 1995-05-04 | 1997-11-03 | Threaded joint, male and female extension means and a method for maintaining a threaded joint |
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| SE9304189A SE507097C2 (en) | 1993-12-17 | 1993-12-17 | Threaded union between female and male coupling parts in drill train for striking drilling |
| CA002219893A CA2219893A1 (en) | 1993-12-17 | 1995-05-04 | Threaded coupling, male and female extension members as well as a method of maintaining a threaded coupling |
| PCT/SE1995/000485 WO1996035038A1 (en) | 1993-12-17 | 1995-05-04 | Threaded coupling, male and female extension members as well as a method of maintaining a threaded coupling |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA2219893A1 true CA2219893A1 (en) | 1996-11-07 |
Family
ID=27170509
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA002219893A Abandoned CA2219893A1 (en) | 1993-12-17 | 1995-05-04 | Threaded coupling, male and female extension members as well as a method of maintaining a threaded coupling |
Country Status (2)
| Country | Link |
|---|---|
| CA (1) | CA2219893A1 (en) |
| WO (1) | WO1996035038A1 (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112664147B (en) * | 2020-12-07 | 2022-11-25 | 中煤科工集团重庆研究院有限公司 | Tooth-embedded stop type forward and reverse rotation drill rod |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CA1148193A (en) * | 1980-01-11 | 1983-06-14 | Kornelis N. Zijlstra | Coupling for interconnecting pipe sections and pipe section for well drilling operations |
| FR2487037B1 (en) * | 1980-07-17 | 1986-02-21 | Vallourec | JOINT FOR TUBES INTENDED IN PARTICULAR FOR THE OIL INDUSTRY |
-
1995
- 1995-05-04 CA CA002219893A patent/CA2219893A1/en not_active Abandoned
- 1995-05-04 WO PCT/SE1995/000485 patent/WO1996035038A1/en active IP Right Grant
Also Published As
| Publication number | Publication date |
|---|---|
| WO1996035038A1 (en) | 1996-11-07 |
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| GB2245916A (en) | "Borehole plug" |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| EEER | Examination request | ||
| FZDE | Discontinued |