SE538166C2 - Lowering drill with parallel flows for rotary motor and hammer respectively - Google Patents
Lowering drill with parallel flows for rotary motor and hammer respectively Download PDFInfo
- Publication number
- SE538166C2 SE538166C2 SE1450848A SE1450848A SE538166C2 SE 538166 C2 SE538166 C2 SE 538166C2 SE 1450848 A SE1450848 A SE 1450848A SE 1450848 A SE1450848 A SE 1450848A SE 538166 C2 SE538166 C2 SE 538166C2
- Authority
- SE
- Sweden
- Prior art keywords
- pressure chamber
- rotary motor
- drilling machine
- drill bit
- percussion
- Prior art date
Links
- 238000009527 percussion Methods 0.000 claims abstract description 27
- 238000005553 drilling Methods 0.000 claims abstract description 20
- 239000007788 liquid Substances 0.000 claims abstract description 17
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 4
- 238000007599 discharging Methods 0.000 claims 1
- 235000015250 liver sausages Nutrition 0.000 claims 1
- XYSQXZCMOLNHOI-UHFFFAOYSA-N s-[2-[[4-(acetylsulfamoyl)phenyl]carbamoyl]phenyl] 5-pyridin-1-ium-1-ylpentanethioate;bromide Chemical compound [Br-].C1=CC(S(=O)(=O)NC(=O)C)=CC=C1NC(=O)C1=CC=CC=C1SC(=O)CCCC[N+]1=CC=CC=C1 XYSQXZCMOLNHOI-UHFFFAOYSA-N 0.000 claims 1
- 238000005520 cutting process Methods 0.000 description 2
- 230000007423 decrease Effects 0.000 description 2
- 239000012530 fluid Substances 0.000 description 2
- 230000001105 regulatory effect Effects 0.000 description 2
- 239000011435 rock Substances 0.000 description 2
- 230000003247 decreasing effect Effects 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
- E21B4/00—Drives for drilling, used in the borehole
- E21B4/06—Down-hole impacting means, e.g. hammers
- E21B4/14—Fluid operated hammers
-
- 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
- E21B4/00—Drives for drilling, used in the borehole
- E21B4/16—Plural down-hole drives, e.g. for combined percussion and rotary drilling; Drives for multi-bit drilling units
-
- 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
- E21B6/00—Drives for drilling with combined rotary and percussive action
- E21B6/02—Drives for drilling with combined rotary and percussive action the rotation being continuous
- E21B6/04—Separate drives for percussion and rotation
-
- 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
- E21B6/00—Drives for drilling with combined rotary and percussive action
- E21B6/06—Drives for drilling with combined rotary and percussive action the rotation being intermittent, e.g. obtained by ratchet device
- E21B6/08—Separate drives for percussion and rotation
Landscapes
- Engineering & Computer Science (AREA)
- Life Sciences & Earth Sciences (AREA)
- Geology (AREA)
- Mining & Mineral Resources (AREA)
- Physics & Mathematics (AREA)
- Environmental & Geological Engineering (AREA)
- Fluid Mechanics (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Geochemistry & Mineralogy (AREA)
- Mechanical Engineering (AREA)
- Earth Drilling (AREA)
Abstract
SAMMANDRAG Foreliggande uppfinning avser en sankborrmaskin som via en borrstrang drivs av ett vatskeflode, innefattande ett hus med en slagborrhammare, slagborrhammaren anordnad med en borrkrona monterad i en kronhylsa, en slagkolv med en kolvyta anordnad att sla pa en nacke pa borrkronan, och en ventil for att styra slagkolven fram och Ater, varvid ventilen vaxelvis trycksatter och avlastar ett tryckrum som vid tryckbelastning driver slagkolven framat, huset vidare innefattande en vatskedriven rotationsmotor av vingmotortyp innefattande tryckrum med vingar som vid tryckbelastning roterar borrkronan. Vatskeflodet leds in i huset genom en flodesfordelare och fordelas vidare mellan rotationsmotorns tryckrum och slagkolvens tryckrum. SUMMARY The present invention relates to a submersible drilling machine driven by a drilling rig via a drill string, comprising a housing with a percussion hammer, the percussion hammer arranged with a drill bit mounted in a crown sleeve, a percussion piston with a piston surface arranged to strike a neck and a drill bit to steer the percussion piston forward and Ater, the valve alternately pressurizes and relieves a pressure chamber which, under pressure load, drives the percussion piston forward, the housing further comprising a water-powered rotary motor of the wing motor type comprising pressure chambers with wings which rotate the drill bit under pressure load. The liquid stream is led into the housing through a river distributor and is further distributed between the pressure chamber of the rotary engine and the pressure chamber of the percussion piston.
Description
Sankborrmaskin med parallella floden f6r rotationsmotor respektive hammare TEKNISKT OMRADE Foreliggande uppfinning avser en vatskedriven sankborrmaskin innefattande ett hus, en borrkrona vridfast monterad i en kronhylsa, en slagkolv anordnad att sla pa en nacke pa borrkronan och en till huset anordnad vaskedriven vingmotor for rotation av borrkronan. TECHNICAL FIELD The present invention relates to a water-powered submersible drilling machine comprising a housing, a drill bit rotatably mounted in a crown sleeve, a percussion piston arranged to strike a neck on the drill bit and a washer attached to the housing.
BAKGRUND Vatskedrivna sankborrmaskiner av detta slag anvands ofta med borror som skarvas ihop. Vatskan som driver slagen och rotationen leds genom roren. Ett annat satt att leda drivvatskan är genom s.k. coiled tubing, ett flexibelt borthr som hasplas av en rulle. Fordelen med att anvanda ett flexibelt ror är att borrningens riktning kan styras, samt att borrningen gar snabbare tack vare att roret inte behover skarvas. BACKGROUND Water-powered submersible drills of this type are often used with drills that are spliced together. The liquid that drives the blows and the rotation is led through the rudders. Another way to lead the driving fluid is through so-called coiled tubing, a flexible drill bit that is reeled by a roller. The advantage of using a flexible rudder is that the direction of the drilling can be controlled, and that the drilling goes faster thanks to the fact that the rudder does not need to be spliced.
Nackdelen med denna typ av vatskedrivna sankborrmaskiner är att vatskan leds forst till den del som sitter narmast borrorets ande, exempelvis en motor som driver rotationen. Det tryck och flode som inte anvands for rotationen leds vidare till den andra delen, exempelvis hammaren. Detta innebar att den del som endast har tillgang till overskottsflodet är svar att overvaka, eftersom trycket kan variera beroende pa hur mycket tryck som anvands av den forsta delen. Detta innebar att om borrkronan fastnar 55 stannar rotationsmotorn, varvid inget flode kommer till hammaren. The disadvantage of this type of water-powered submersible drilling machine is that the water is first led to the part closest to the spirit of the drilling, for example a motor that drives the rotation. The pressure and flow not used for the rotation are passed on to the other part, for example the hammer. This meant that the part that only has access to the excess flow is the answer to monitor, as the pressure can vary depending on how much pressure is used by the first part. This meant that if the drill bit gets stuck 55, the rotary motor stops, with no flood coming to the hammer.
SAMMANFATTNING AV UPPFINNINGEN Syftet med den foreliggande uppfinningen är att vid v5tskedrivna sankborrmaskiner av det slag som ha separat rotationsmotor och hammare, pa ett enkelt satt ge bada delarna tillgang till fullt vatsketryck och vatskeflocle. Ett annat syfte är att astadkomma en vatskedriven sankborrmaskin som är lattare att styra vid riktningsstyrd borrning. SUMMARY OF THE INVENTION The object of the present invention is that in liquid-powered submersible drills of the type having a separate rotary motor and hammer, both parts are easily given access to full water pressure and water floc. Another object is to provide a water-powered submersible drilling machine which is easier to control in directional drilling.
Dessa syften astadkommes genom att rotationsmotorn och hammaren är parallellkopplade till flodet. Uppfinningen definieras av de efterfoljande patentkraven. 1 FIGURBESKRIVNING Figur 1 visar en sammanstallning av en sankborrmaskin med slagverk och rotationsmotor, Figur 2 visar en rotationsmotor i genomskarning, och BESKRIVNING AV UTFORINGSFORMER Den vatskedrivna sankborrmaskinen 1 som visas i figur 1 har ett maskinhus 2 med ett konventionellt slagverk eller slaghammare 3. Vid borrning är s5ledes hela maskinhuset infort i ett borrhAl i berget med slaghammaren riktad mot borrhAlets botten och borrstrangen strackande sig ut ur borrhalet sammankopplad med en ej visad källa for en trycksatt fluid via en anslutning A. These objects are achieved by the rotary motor and the hammer being connected in parallel to the river. The invention is defined by the appended claims. DESCRIPTION OF THE FIGURES Figure 1 shows an assembly of a submersible drilling machine with percussion and rotary motor, Figure 2 shows a rotary motor in section, and DESCRIPTION OF EMBODIMENTS The water-powered submersible drilling machine 1 shown in Figure 1 has a machine housing 2 with a conventional percussion hammer or hammer. Thus, the entire machine housing is inserted into a borehole in the rock with the percussion hammer directed towards the bottom of the borehole and the drill string extending out of the borehole connected to a source (not shown) for a pressurized fluid via a connection A.
Aven om foreliggande utforingsexempel beskrivs utgaende fran en vatskedriven slaghammare bor det underforsta's att den uppfinningsenliga anordningen inte Jr begransad for tillampning vid hammare av sAdant slag, utan kan arrangeras vid en slaghammare som drivs av vilket som heist lampligt trycksatt medium exempelvis luft eller s.k. mud. Maskinhuset 2 innefattar ett rorformigt maskinror 4, och en borrkrona 6 sticker in i maskinrorets ande med sin nacke 7. Ett slagverk 5 med en slagkolv 8 uppvisande en kolvyta Y är monterad i maskinroret 4 och är axiellt rorligt anordnad att sI5 p5 borrkronans 6 nacke 7. Slagkolven 8 är kopplad till ett vatskeflode som via en ventil V omvaxlande fyller och tommer ett eller flera tryckrum 9, 9a for vatskan under tryck, som via kolvytan Y slar kolven 8 mot borrkronans 6 nacke 7. Ventilen kan innefatta en slidventil, men kan aven innefatta andra ventiltyper. Nar slagkolven 8 utfort sitt slag, sans tryckrummet 9b under I5gt tryck, varvid slagkolven bringas att utfora sitt returslag. Although the present exemplary embodiment is described on the basis of a water-powered hammer, it should be understood that the device according to the invention is not limited to application with hammers of this type, but can be arranged with a hammer driven by any highly pressurized medium, for example air or so-called mud. The machine housing 2 comprises a rudder-shaped machine rudder 4, and a drill bit 6 protrudes into the spirit of the machine rudder with its neck 7. A percussion device 5 with a percussion piston 8 having a piston surface Y is mounted in the machine rudder 4 and is axially movably arranged to sI5 p5 the drill bit 6 neck 7 The percussion piston 8 is connected to a liquid flood which via a valve V alternately fills and empties one or more pressure chambers 9, 9a for the liquid under pressure, which via the piston surface Y strikes the piston 8 against the neck 7 of the drill bit 6. The valve may comprise a slide valve, but may also include other valve types. When the percussion piston 8 has made its stroke, the pressure chamber 9b is under low pressure, whereby the percussion piston is caused to perform its return stroke.
Borrkronans 6 hals H har en splineforbindning 10 med en borrkronhylsa 11, vilket ger borrkronan 6 en styrd fram och 5tergAende rorelse enligt pilen i figur 1. Borrkronhylsan 11 är fastskruvad, fastpressad eller p5 annat satt fastsatt i maskinroret 4. Borrkronans 6 nacke 7 monteras i borrkronhylsan 11 varefter en stoppring 13 monteras p5 borrkronans 6 nacke 7 for att forhindra att borrkronan 6 kan falla ut fran hylsan 11. Darefter monteras borrkronhylsan 11 i maskinrorets 4 ande 4a. Borrkronan 6 kan i en annan utforingsform vara forsedd med endast ett sp5r 14 for att styra den fram och AtergAende rorelsen. The neck H of the drill bit 6 has a spline connection 10 with a drill bit sleeve 11, which gives the drill bit 6 a controlled forward and rearward movement according to the arrow in Figure 1. The drill bit sleeve 11 is screwed, pressed or otherwise fixed in the machine tube 4. The drill bit 6 neck 7 is mounted the drill bit sleeve 11, after which a stop ring 13 is mounted on the neck 7 of the drill bit 6 to prevent the drill bit 6 from falling out of the sleeve 11. Then the drill bit sleeve 11 is mounted in the spirit 4a of the machine tube 4. In another embodiment, the drill bit 6 may be provided with only one groove 14 to control the forward and return movements.
Maskinhusets andra ande 4b Jr anordnad med en rotationsmotor 15 enligt figur 2 och 3. Rotationsmotorn 15 innefattar en allmant kand vingmotor av den typ som innefattar ett hus H 2 med radiellt rorliga vingar 16 anordnade p5 en rotoraxel 17 omgiven av ett tryckrum 18. Tryckrummet kan med fordel bildas av husets H insida och rotoraxelns 17 mantel. Rotationsaxeln innefattar en central kanal 21 for ledande av floclet till slaghammaren 3. Tryckrummet 18 är sA utformat att volymen okar i btirjan av rotationsrorelsen, for att minska i slutet av rotationsrorelsen. Tack vare att vingarna 16 är radiellt rorliga foljer vingarna 16 tryckrummets 18 form ochfAr p5 sA satt en okande area for att i slutet av rotationsrorelsen 15 en minskande area. Nar den trycksatta vatskan leds in i tryckrummet 18 trycker den vingen 16 framfor sig varvid rotationen astadkommes. Vid rotationen bringas borrkronan 6 att rotera genom att den medfoljer vingmotorns 15 rotation. The second end 4b Jr of the machine housing arranged with a rotary motor 15 according to Figures 2 and 3. The rotary motor 15 comprises a generally known wing motor of the type comprising a housing H 2 with radially movable wings 16 arranged on a rotor shaft 17 surrounded by a pressure chamber 18. The pressure chamber can advantageously formed by the inside of the housing H and the mantle of the rotor shaft 17. The axis of rotation comprises a central channel 21 for guiding the floc to the percussion hammer 3. The pressure chamber 18 is designed so that the volume increases at the beginning of the rotational movement, in order to decrease at the end of the rotational movement. Due to the fact that the wings 16 are radially movable, the wings 16 follow the shape of the pressure chamber 18 and for this reason an increasing area is set so that at the end of the rotational movement 15 a decreasing area. When the pressurized liquid is led into the pressure chamber 18, it pushes the wing 16 in front of it, whereby the rotation is effected. During the rotation, the drill bit 6 is caused to rotate by following the rotation of the wing motor 15.
Rotationsmotorn 15 är roterbart monterad till borrstrangen pa sa satt att borrstrangen st5r stilla, dvs den roterar inte, medan hammaren 3 är vridfast monterad till rotationsmotorn 15. Detta innebar att en s.k. coil kan anvandas for att leda vatska till maskinhuset 2, enligt Figur 2, varvid hammaren 3 och rotationsmotorn 15 roterar nar vatskefloclet leds genom coilen eller borrstrangen till maskinhuset 2. The rotary motor 15 is rotatably mounted to the drill string in such a way that the drill string is stationary, ie it does not rotate, while the hammer 3 is rotatably mounted to the rotary motor 15. This meant that a so-called coil can be used to direct liquid to the machine housing 2, according to Figure 2, wherein the hammer 3 and the rotary motor 15 rotate when the liquid floc is guided through the coil or the drill string to the machine housing 2.
Den trycksatta vatskan leds in i maskinhuset 2 via borroret eller borrstrangen genom en anslutning A i den ande av maskinroret 4b som rotationsmotorn 15 är placerad vid. Nar vatskan kommer in i maskinhuset 2 kommer den forst till en flodesavdelare 19. Flodesavdelaren 19 leder flodet frAn borrstrangens kanal till flodesvagar 20 upptagna i anslutningens A gods. The pressurized liquid is led into the machine housing 2 via the drill pipe or drill string through a connection A in the spirit of the machine pipe 4b at which the rotary motor 15 is located. When the liquid enters the machine housing 2, it first comes to a river divider 19. The river divider 19 leads the river from the channel of the drill string to river troughs 20 accommodated in the goods of the connection A.
Flodesvagarna 20 i anslutningens gods leder vatskeflodet bAde till rotationsmotorns tryckrum 18 och till motorns central kanal 21 som forbinder flodet med hammarens 3 tryckrum 9. The tidal waves 20 in the connection goods lead the liquid flow both to the pressure chamber 18 of the rotary motor and to the central channel 21 of the motor which connects the river to the pressure chamber 9 of the hammer 3.
Nar flodet fra'n borrstrangen kommer till rotationsmotorn 15 borjar denna rotera medtagande maskinhuset i rotationsrorelsen. Samtidigt star flodet i konstant forbindelse med slaghammaren 3 via den centrala kanalen 21. Tack vare arrangemanget med flodesavdelare 19 och sammankopplingen mellan rotationsmotorn 15 och hammaren 3 f5r 135de hammare 3 och rotationsmotor 15 tillgAng till fullt tryck. Darmed kan trycket over hammaren 3 kontrolleras och styras ph' ett fordelaktigt satt genom att anpassa det flode med vilket vatskan leds genom borrstrangen. 3 Om motst5ndet med vilket borrkronan 6 anligger mot berget i borrhalets botten blir for I5gt, finns risken att rotationsmotorn 15 !polar rotera for fort. For att undvika detta kan inloppet in I maskinhuset 2 anordnas med en flodesreglerande ventil 22. Ventilen 22 stalls infor borrningen in p5 det maximala flodet som den aktuella borrningen Jr avsedd for. Om motstAndet p5 borrkronan 6 blir for 15gt, forhindras sAledes rotationsmotorn 15 frAn att rotera med en hastighet som är storre an den hastighet som floclet medger. Flodesventilen 22 kan i en annan utforingsform vara sA utformad att flodesbegransningen kan regleras under pagaende borrning. When the flow from the drill string reaches the rotary motor 15, it begins to rotate with the machine housing in the rotational motion. At the same time, the flow is in constant communication with the percussion hammer 3 via the central channel 21. Thanks to the arrangement with river divider 19 and the connection between the rotary motor 15 and the hammer 3 for the 135th hammer 3 and the rotary motor 15 access to full pressure. Thus, the pressure over the hammer 3 can be controlled and controlled ph 'in an advantageous manner by adjusting the flow with which the liquid is led through the drill string. 3 If the resistance with which the drill bit 6 abuts against the rock in the bottom of the drill tail becomes too low, there is a risk that the rotary motor 15 will rotate too fast. To avoid this, the inlet into the machine housing 2 can be arranged with a flow regulating valve 22. The valve 22 is set in front of the borehole to the maximum flow for which the current borehole Jr is intended. Thus, if the resistance of the drill bit 6 becomes too high, the rotary motor 15 is prevented from rotating at a speed greater than the speed allowed by the floc. In another embodiment, the river valve 22 may be designed so that the river boundary can be regulated during ongoing drilling.
Nar den trycksatta vatskan i tryckrummen 9, 18 har bringat motorn 15 att rotera och hammaren 3 att slA p5 borrkronan 6 sa leds floclet vidare till utlopp 23, 24 som mynnar utanfor maskinroret 4. Motorn 15 och hammaren 3 har separata utlopp, hammarens utlopp 23 langst in i borrhAlet via en kanal genom borrkronans hals och en kanal K strackande sig genom slagkolven, och rotationsmotorns utlopp 24 narmare hAlets mynning. Detta ger fordelen att borrkaxet forflyttas effektivt bort frAn borrkronans 6 omr5de. Under det att returflodet med borrkax forflyttas genom borrhAlet mot borrhAlets mynning s5 avtar flodet. Nar returflodet nAr rotationsmotorns 15 utlopp, s5 f5r utloppsvatskan ett tillskott b5de i flode och i tryck, varvid borrhAlet rensas p5 ett effektivt satt. En ej visad kanal leder en del av returflodet genom borrkronan, och mynnar ut i borrkronans 6 centrum for att spola rent borrkronan 6. When the pressurized liquid in the pressure chambers 9, 18 has caused the motor 15 to rotate and the hammer 3 to strike the drill bit 6, the floc is led on to outlets 23, 24 which open outside the engine tube 4. The motor 15 and the hammer 3 have separate outlets, the hammer outlet 23 furthest into the borehole via a channel through the neck of the drill bit and a channel K extending through the percussion piston, and the outlet of the rotary engine 24 closer to the mouth of the borehole. This gives the advantage that the drill cuttings are moved efficiently away from the area of the drill bit 6. As the return flow with drill cuttings is moved through the borehole towards the mouth s5 of the borehole, the flow decreases. When the return flow reaches the outlet of the rotary motor 15, the outlet liquid receives an addition both in flow and in pressure, whereby the borehole is cleaned in an efficient manner. A channel (not shown) leads a part of the return flow through the drill bit, and opens into the center of the drill bit 6 to flush the drill bit 6 clean.
Foreliggande uppfinning är inte begransad till det ovan beskrivna utan kan andras och modifieras p5 en rad olika satt inom ramen for den i de efterfoljande patentkraven angivna up pfi n ni ngsta nken. 4 The present invention is not limited to what has been described above but may be modified and modified in a variety of ways within the scope of the appended claims set forth in the appended claims. 4
Claims (8)
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| SE1450848A SE538166C2 (en) | 2014-07-04 | 2014-07-04 | Lowering drill with parallel flows for rotary motor and hammer respectively |
| PCT/SE2015/050622 WO2016003350A1 (en) | 2014-07-04 | 2015-05-29 | Down-the-hole drill with parallel flows for rotation motor and hammer. |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| SE1450848A SE538166C2 (en) | 2014-07-04 | 2014-07-04 | Lowering drill with parallel flows for rotary motor and hammer respectively |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| SE1450848A1 SE1450848A1 (en) | 2016-01-05 |
| SE538166C2 true SE538166C2 (en) | 2016-03-22 |
Family
ID=55019720
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| SE1450848A SE538166C2 (en) | 2014-07-04 | 2014-07-04 | Lowering drill with parallel flows for rotary motor and hammer respectively |
Country Status (2)
| Country | Link |
|---|---|
| SE (1) | SE538166C2 (en) |
| WO (1) | WO2016003350A1 (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106150349B (en) * | 2016-07-14 | 2018-09-14 | 山东大东联石油设备有限公司 | A kind of circumferential direction axial vacuum impact speed-raising tool |
| SE545668C2 (en) * | 2020-10-01 | 2023-11-28 | Lkab Wassara Ab | Drive device for rotatable operation of a drill bit in a sink drilling machine |
Family Cites Families (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4006783A (en) * | 1975-03-17 | 1977-02-08 | Linden-Alimak Ab | Hydraulic operated rock drilling apparatus |
| FI58675C (en) * | 1979-06-26 | 1981-03-10 | Tampella Oy Ab | HYDRAULIC BORRING |
| FI72178C (en) * | 1983-10-28 | 1987-04-13 | Tampella Oy Ab | MED ROTATIONSMASKINERI FOERSEDD TRYCKMEDIEDRIVEN SLAGBORRMASKIN. |
| SE523255C2 (en) * | 2001-12-14 | 2004-04-06 | Wassara Ab | Liquid powered submersible drill |
-
2014
- 2014-07-04 SE SE1450848A patent/SE538166C2/en unknown
-
2015
- 2015-05-29 WO PCT/SE2015/050622 patent/WO2016003350A1/en active Application Filing
Also Published As
| Publication number | Publication date |
|---|---|
| SE1450848A1 (en) | 2016-01-05 |
| WO2016003350A1 (en) | 2016-01-07 |
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