WO2008051132A1 - Air actuated down- the -hole hammer and drill bit and foot valve for use in the hammer - Google Patents
Air actuated down- the -hole hammer and drill bit and foot valve for use in the hammer Download PDFInfo
- Publication number
- WO2008051132A1 WO2008051132A1 PCT/SE2007/000764 SE2007000764W WO2008051132A1 WO 2008051132 A1 WO2008051132 A1 WO 2008051132A1 SE 2007000764 W SE2007000764 W SE 2007000764W WO 2008051132 A1 WO2008051132 A1 WO 2008051132A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- foot valve
- drill bit
- stop means
- hammer
- central passage
- Prior art date
Links
- 238000000605 extraction Methods 0.000 claims abstract description 24
- 238000003780 insertion Methods 0.000 claims abstract description 19
- 230000037431 insertion Effects 0.000 claims abstract description 19
- 238000005553 drilling Methods 0.000 claims abstract description 18
- 239000011435 rock Substances 0.000 claims description 5
- 238000005520 cutting process Methods 0.000 claims description 2
- 238000011010 flushing procedure Methods 0.000 abstract description 2
- 238000012546 transfer Methods 0.000 abstract description 2
- 239000004033 plastic Substances 0.000 description 3
- 229920003023 plastic Polymers 0.000 description 3
- 239000000428 dust Substances 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 229920004943 Delrin® Polymers 0.000 description 1
- 230000004075 alteration Effects 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 230000000295 complement effect Effects 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 239000012530 fluid Substances 0.000 description 1
- 230000006870 function Effects 0.000 description 1
- 238000011900 installation process Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 229920001778 nylon Polymers 0.000 description 1
- 230000002028 premature Effects 0.000 description 1
- 238000003825 pressing Methods 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 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
- E21B21/00—Methods or apparatus for flushing boreholes, e.g. by use of exhaust air from motor
- E21B21/10—Valve arrangements in drilling-fluid circulation systems
Definitions
- the present invention relates generally to an air actuated down-the-hole hammer for rock drilling, a drill bit and a foot valve to be used in the down-the-hole hammer.
- the down-the-hole hammer is provided with a plastic foot valve located in a central passage in a drill bit anvil and projecting from an impact surface of the anvil.
- the foot valve is repeatedly enclosed by a central bore of a reciprocating piston to transfer spent pressurized driving air through the drill bit.
- the piston can unseat the foot valve from the bit shank body when it begins the upward stroke due to wear from long run deep hole drilling applications, tolerjance differences from different manufacturers, and the debris that may come between the piston bore and the outer diameter of the foot valve.
- deep hole drilling means drilling for oil and gas which can range anywhere from 100 to 3,000 meters.
- the run hours on the hammer, bit and foot valve can exceed 36 continuous hours, and under warm temperatures down hole of around 135 degrees Celsius. It is disadvantageous to trip that much pipe back out of the hole just to change a plastic foot valve.
- the cost exceeds approximately $12,000.00 a day for rig time.
- an object of the invention is to provide a drill bit and foot valve for a percussive down-the-hole hammer which provides an extended lifespan of the foot valve.
- Another object of the invention is to provide a drill bit for a down-the-hole hammer that will prevent the dislocation of the foot valve from the bit body, especially during deep hole drilling conditions.
- Yet another object of the invention is to provide a foot valve for a down-the-hole drill bit that will have a longer life between service than in hitherto known percussive down-the-hole hammers.
- Still another object of the invention is to provide a drill bit and a foot valve that are less sensitive to tolerance faults.
- the invention provides an air-actuated down-the-hole hammer for rock drilling, including a generally cylindrical casing defining an axis, a drill sub mounted to a rear end of the casing, a drill chuck mounted to a front end of the casing, and a drill bit mounted in the drill chuck and including a front cutting face and a rear anvil portion.
- the anvil portion includes a rearwardly facing anvil surface.
- the drill bit includes a first central passage extending through the anvil surface, the passage forming a cavity adjacent to the rear anvil surface.
- a piston is mounted in the casing behind the drill bit and includes a forwardly facing impact surface and a second central passage extending through the impact surface and aligned with the first central passage.
- the piston is mounted for axial reciprocation toward and away from the drill bit whereby the impact surface impacts the anvil surface during a forward stroke of the piston.
- a foot valve extends partially in the first central passage and partially in the second central passage when the impact surface impacts the anvil surface for transferring pressurized air from the second central passage to the first central passage.
- the foot valve and the first central passage include insertion stop means and major extraction stop means for the foot valve, such that the insertion stop means are provided at a distance from the major extraction stop means.
- the invention provides a percussive drill bit for use in a down-the-hole hammer, including a front drilling face, a rear anvil surface, and a central passage extending through the anvil surface along a center axis of the drill bit, the passage forming a cavity adjacent to the rear anvil surface, the cavity including an undercut defined by a, at least partly, tapered portion and upper and lower ends.
- the invention provides a foot valve that is used in a drill bit passage in an air-actuated down-the-hole hammer for rock drilling, including a generally cylindrical tube defining a center line, an upper end and a lower end, the foot valve including insertion stop means and major extraction stop means, such that the insertion stop means is provided at a distance from the major extraction stop means.
- FIG. 1 is a down-the-hole hammer according to the present invention in a cross- sectional view
- FIG. 2A is a drill bit according to the present invention in a side elevational view; [0013] FIG. 2B shows the drill bit at line 2B-2B in FIG. 2A; [0014] FIG. 2C shows the drill bit in FIG. 2A in a perspective view; [0015] FIG. 3 A shows a portion of the drill bit according to the present invention, a portion of a piston, and a foot valve according to the present invention, in a cross-sectional view; [0016] FIG. 3B shows an enlarged area, encircled in FIG. 3A;
- FIG. 4A shows a foot valve according to the present invention in a side view; and [0018] FIG. 4B shows the foot valve in an end view.
- FIG. 1 there is shown a down-the-hole hammer 10 according to the present invention.
- the hammer 10 includes an outer cylindrical casing 1 1 connectable to a rotatable drill pipe string, not shown, through which compressed air is conducted.
- a hammer piston 16 reciprocates in the cylindrical casing 1 1, and compressed air is directed alternately to the upper and lower ends of the piston to effect its reciprocation in the casing, each downward stroke inflicting an impact blow upon an anvil 30 of a drill bit 13 extending upwardly within the lower portion of the cylindrical casing.
- the piston includes a passage 31 for the pressurized air.
- the percussive down-the-hole hammer further includes a top sub 14, a check valve 35, a control or fluid feed tube 15, a foot valve 20, a retaining means 33 and a driver sub 12.
- the foot valve 20 is of generally cylindrical basic shape and is made of plastics, such as Nylon® or Delrin®, as illustrated in FIGS. 4A and 4B.
- the foot valve is a hollow tube 21 provided with a circumferential ridge 22 defining the greatest diameter of the foot valve 20.
- the foot valve 20 extends further into the drill bit than into the piston 16 when the piston front surface 23 impacts on the drill bit rear surface 24.
- the average wall thickness of the foot valve 20 is greater at the portion entering the drill bit than the portion entering the piston. That is, the average wall thickness of a lower portion of the foot valve is greater than an upper portion of the foot valve.
- the ridge 22 is provided to keep the foot valve in the drill bit by pressing the ridge into a corresponding annular groove, or fourth tapered portion 17, in a cavity in a drill bit passage 18.
- the cavity is formed adjacent to the anvil.
- the ridge 22 is formed between a first tapered portion 25 and a second tapered portion 26.
- the tapered portions 25, 26 slope away from the ridge 22.
- the first tapered portion 25 is provided adjacent to a first valve portion 27, which is preferably cylindrical.
- the first valve portion 27 is received by the piston passage 31 to close off a bottom air vent of the hammer when the piston descends upon the portion 27.
- the first valve portion 27 has a relatively small wall thickness.
- the first tapered portion 25 inclines at an angle ⁇ of approximately 1.5 - 2.5 degrees relative to a center line of the foot valve 20 or a center line CL of the hammer 10, i.e. the first portion 25 tapers axially towards the piston 16.
- the first tapered portion 25 may have an interference fit with a complementary first cavity portion or third tapered portion 29 in the drill bit passage 18. The inclination of the first cavity portion 29 is chosen similar to the angle ⁇ .
- the interference fit resists pull out and counters the pulling forces from the piston 16 during its upward cycle. It also adds more wall thickness to the foot valve to make it a stronger area.
- the second tapered portion 26 inclines at an angle ⁇ of approximately 3-6 degrees relative to the center line of the foot valve 20 or the center line CL of the hammer 10, i.e. the second portion 25 tapers axially towards the drill bit 13. That is, the second tapered portion 26 inclines in the opposite direction relative to the angle ⁇ .
- the angle ⁇ can be 3-6 degrees depending on the diameter or size of the foot valve.
- the angle ⁇ reduces the amount offeree required to install the foot valve into the drill bit passage 18, thereby reducing the amount of deformation and/or damage that can be caused to the foot valve during the installation process and will further reduces the possibility of premature foot valve failure. [0024]
- the angle ⁇ provides added retaining force at the foot valve into the bit body by creating a downward pulling force as well as accounting for any tolerance differences in the manufacturing processes thereof.
- An external, annular shoulder 28 can be formed at the junction of the tapered portions 25, 26.
- the shoulder 28 has a generally radial extension.
- the shoulder is snaps into and cooperates with an annular collar 32, or upper end of an undercut, in the passage 18, which in turn provides the strongest holding feature and ensures against extraction.
- the shoulder 28 and the collar 32 may also be called major extraction stop means.
- a guide portion 34 is provided at the lower end of the foot valve.
- the guide portion 34 is substantially cylindrical and acts as a lower guide bushing in cooperation with a lower guide surface 36 of the passage 18.
- the guide portion and the guide surface have the same measurements in diameter and are preferably not press fit as are other features discussed above.
- the guide portion 34 and the guide surface 36 each connects to a nose end 37 and a second collar 38 or lower end of an undercut, respectively.
- the nose end 37 and the second collar 38 prevent further insertion of the foot valve into the passage 18 as the foot valve will bottom out in the passage.
- the nose end 37 and the second collar 38 can be rounded or chamfered.
- the nose end 37 and the second collar 38 may also be called insertion stop means.
- the insertion stop means are provided at a distance, at least 12 mm, from the major extraction stop means.
- An undercut is thus defined in the passage 18 by the tapered portion 17, the guide portion 36 and upper 32 and lower ends 38.
- Mounting of the foot valve is done as follows.
- the foot valve 20 is aligned with the drill bit passage 18 such that a guide portion 34 may be inserted into the first cavity portion 29 of the passage.
- the nose end 37 enters into the passage more easily if the nose end is rounded or chamfered.
- the second tapered portion 26 may abut against the passage when the entire guide portion has entered the passage 18. The force needed for insertion of the foot valve gradually increases due to the increasing diameter of the portion 26 until the ridge 22 enters the passage 18.
- the insertion stop means 37, 38 will define the maximum possible inserted length L of the foot valve.
- the inserted length L of the foot valve into the drill bit is typically 40 to 70 mm, and about 60 mm in the shown example.
- the distance L3 between the major extraction means 28, 32 and the impact surface 24 of the .drill bit is 15 - 30 mm.
- the distance L2 between the insertion stop means 37, 38 and the upper portion of the guide portions 34, 36 is 20 - 40 mm.
- the piston passage 31 will tend to grip the foot valve and lift it from the drill bit passage.
- the major extraction stop means i.e. the shoulder 28 and the collar 32.
- the first tapered portion 25 and the first cavity portion 29 in the drill bit passage 18 aid to some extent in preventing the extraction.
- a drill bit and a foot valve according to the present invention will provide for an extended lifespan of the hammer before service is needed. Furthermore, a down-the hole hammer according to the present invention will have a more reliable function and more economical usage than hitherto known hammers. In addition, the down-the-hole hammer is less sensitive to tolerance faults.
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
Description
Claims
Priority Applications (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
AU2007309755A AU2007309755A1 (en) | 2006-10-26 | 2007-09-03 | Air actuated down- the -hole hammer and drill bit and foot valve for use in the hammer |
EP07794130A EP2078131A1 (en) | 2006-10-26 | 2007-09-03 | Air actuated down- the -hole hammer and drill bit and foot valve for use in the hammer |
CA002665235A CA2665235A1 (en) | 2006-10-26 | 2007-09-03 | Air actuated down-the-hole hammer and drill bit and foot valve for use in the hammer |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US11/586,722 US20080099218A1 (en) | 2006-10-26 | 2006-10-26 | Air actuated down-the-hole hammer for rock drilling, a drill bit and a foot valve to be used in the down-the-hole hammer |
US11/586,722 | 2006-10-26 |
Publications (1)
Publication Number | Publication Date |
---|---|
WO2008051132A1 true WO2008051132A1 (en) | 2008-05-02 |
Family
ID=39324841
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/SE2007/000764 WO2008051132A1 (en) | 2006-10-26 | 2007-09-03 | Air actuated down- the -hole hammer and drill bit and foot valve for use in the hammer |
Country Status (9)
Country | Link |
---|---|
US (1) | US20080099218A1 (en) |
EP (1) | EP2078131A1 (en) |
KR (1) | KR20090082182A (en) |
CN (1) | CN101529044A (en) |
AU (1) | AU2007309755A1 (en) |
CA (1) | CA2665235A1 (en) |
CL (1) | CL2007003098A1 (en) |
WO (1) | WO2008051132A1 (en) |
ZA (1) | ZA200902395B (en) |
Cited By (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN101676514A (en) * | 2008-07-10 | 2010-03-24 | 伯纳德·莱昂内尔·吉安 | Pneumatic drill |
CN102003139A (en) * | 2010-10-12 | 2011-04-06 | 贵州航天天马机电科技有限公司 | Single body large-diameter pneumatic down-the-hole hammer |
EP2873799A1 (en) | 2013-11-18 | 2015-05-20 | Sandvik Intellectual Property AB | Down-the-hole hammer drill bit assembly |
WO2015110217A2 (en) | 2014-01-21 | 2015-07-30 | Sandvik Intellectual Property Ab | Quick release down-the-hole hammer drill bit assembly |
CN105464609A (en) * | 2015-12-21 | 2016-04-06 | 中国石油天然气股份有限公司 | Well flushing valve |
EP3214259A1 (en) | 2016-03-04 | 2017-09-06 | Sandvik Intellectual Property AB | Down-the-hole hammer drill bit retaining assembly |
Families Citing this family (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
AT511616B1 (en) * | 2011-09-08 | 2013-01-15 | Tmt Bbg Res And Dev Gmbh | DEVICE FOR SUPPLYING DISHWASHER IN A DRILLING HAMMER |
US10100578B2 (en) * | 2013-06-10 | 2018-10-16 | Center Rock, Inc. | Pressure control check valve for a down-the-hole drill hammer |
EP2873489B1 (en) * | 2013-11-13 | 2018-10-24 | Sandvik Mining and Construction Oy | Impact device and method of dismounting the same |
SI3256683T1 (en) * | 2014-11-14 | 2020-10-30 | Strada Design Limited, | Dual circulation fluid hammer drilling system |
CN109252816B (en) * | 2018-11-19 | 2023-08-15 | 吉林大学 | Edge tooth double-bundle wall-attached jet impact strong-cooling type dry-hot rock down-the-hole hammer drill bit |
CN114352188B (en) * | 2021-12-31 | 2024-01-12 | 核工业北京地质研究院 | Slide valve type valve control mechanism capable of improving working performance of hydraulic impactor |
Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3896886A (en) * | 1973-08-10 | 1975-07-29 | Bakerdrill Inc | Bore hole hammer drill |
US3964551A (en) * | 1974-09-20 | 1976-06-22 | Reed Tool Company | Pneumatic impact drilling tool |
EP0011219A1 (en) * | 1978-11-10 | 1980-05-28 | Halifax Tool Company Limited | Connection of fluid flow path-defining components in down-the-hole hammer drills |
US4333537A (en) * | 1978-11-24 | 1982-06-08 | Harris Jesse W | Impact drilling tool having improved valving |
Family Cites Families (10)
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US4819746A (en) * | 1987-01-13 | 1989-04-11 | Minroc Technical Promotions Ltd. | Reverse circulation down-the-hole hammer drill and bit therefor |
US5131476A (en) * | 1990-12-18 | 1992-07-21 | Percussion Drilling, Inc. | Down hole percussion drill apparatus |
US5205363A (en) * | 1991-05-16 | 1993-04-27 | Pascale Jack H | Porting system for pneumatic impact hammer |
SE506207C2 (en) * | 1992-01-22 | 1997-11-24 | Sandvik Ab | Lower Drill |
US5435402A (en) * | 1994-09-28 | 1995-07-25 | Ziegenfuss; Mark | Self-propelled earth drilling hammer-bit assembly |
SE516116C2 (en) * | 1998-02-02 | 2001-11-19 | Sandvik Ab | Lowering hammer and drill bit |
SE520358C2 (en) * | 1998-03-03 | 2003-07-01 | Sandvik Ab | Striking lowering hammer and drill bit |
SE520941C2 (en) * | 2002-01-23 | 2003-09-16 | Atlas Copco Secoroc Ab | Compressed air driven percussion for a lowering drill and lowering drill |
US7198120B2 (en) * | 2003-03-25 | 2007-04-03 | Bernard Lionel Gien | Down-the-hole drill assembly |
ZA200606939B (en) * | 2005-08-25 | 2007-11-28 | Gien Bernard L | A dril bit |
-
2006
- 2006-10-26 US US11/586,722 patent/US20080099218A1/en not_active Abandoned
-
2007
- 2007-09-03 KR KR1020097007420A patent/KR20090082182A/en not_active Application Discontinuation
- 2007-09-03 AU AU2007309755A patent/AU2007309755A1/en not_active Abandoned
- 2007-09-03 CN CNA2007800398712A patent/CN101529044A/en active Pending
- 2007-09-03 WO PCT/SE2007/000764 patent/WO2008051132A1/en active Application Filing
- 2007-09-03 CA CA002665235A patent/CA2665235A1/en not_active Abandoned
- 2007-09-03 EP EP07794130A patent/EP2078131A1/en not_active Withdrawn
- 2007-10-26 CL CL200703098A patent/CL2007003098A1/en unknown
-
2009
- 2009-04-06 ZA ZA200902395A patent/ZA200902395B/en unknown
Patent Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3896886A (en) * | 1973-08-10 | 1975-07-29 | Bakerdrill Inc | Bore hole hammer drill |
US3964551A (en) * | 1974-09-20 | 1976-06-22 | Reed Tool Company | Pneumatic impact drilling tool |
EP0011219A1 (en) * | 1978-11-10 | 1980-05-28 | Halifax Tool Company Limited | Connection of fluid flow path-defining components in down-the-hole hammer drills |
US4333537A (en) * | 1978-11-24 | 1982-06-08 | Harris Jesse W | Impact drilling tool having improved valving |
Cited By (11)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN101676514A (en) * | 2008-07-10 | 2010-03-24 | 伯纳德·莱昂内尔·吉安 | Pneumatic drill |
CN102003139A (en) * | 2010-10-12 | 2011-04-06 | 贵州航天天马机电科技有限公司 | Single body large-diameter pneumatic down-the-hole hammer |
CN102003139B (en) * | 2010-10-12 | 2012-12-19 | 贵州航天天马机电科技有限公司 | Single body large-diameter pneumatic down-the-hole hammer |
EP2873799A1 (en) | 2013-11-18 | 2015-05-20 | Sandvik Intellectual Property AB | Down-the-hole hammer drill bit assembly |
WO2015071203A2 (en) | 2013-11-18 | 2015-05-21 | Sandvik Intellectual Property Ab | Down-the-hole hammer drill bit assembly |
US9534444B2 (en) | 2013-11-18 | 2017-01-03 | Sandvik Intellectual Property Ab | Down-the-hole hammer drill bit assembly |
WO2015110217A2 (en) | 2014-01-21 | 2015-07-30 | Sandvik Intellectual Property Ab | Quick release down-the-hole hammer drill bit assembly |
CN105464609A (en) * | 2015-12-21 | 2016-04-06 | 中国石油天然气股份有限公司 | Well flushing valve |
EP3214259A1 (en) | 2016-03-04 | 2017-09-06 | Sandvik Intellectual Property AB | Down-the-hole hammer drill bit retaining assembly |
WO2017148978A1 (en) | 2016-03-04 | 2017-09-08 | Sandvik Intellectual Property Ab | Down-the-hole hammer drill bit retaining assembly |
US10662715B2 (en) | 2016-03-04 | 2020-05-26 | Sandvik Intellectual Property Ab | Down-the-hole hammer drill bit retaining assembly |
Also Published As
Publication number | Publication date |
---|---|
ZA200902395B (en) | 2010-06-30 |
CA2665235A1 (en) | 2008-05-02 |
US20080099218A1 (en) | 2008-05-01 |
AU2007309755A1 (en) | 2008-05-02 |
EP2078131A1 (en) | 2009-07-15 |
CL2007003098A1 (en) | 2008-05-30 |
CN101529044A (en) | 2009-09-09 |
KR20090082182A (en) | 2009-07-29 |
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