WO2013059878A1 - Reverse circulation hammer spline arrangement improvements - Google Patents
Reverse circulation hammer spline arrangement improvements Download PDFInfo
- Publication number
- WO2013059878A1 WO2013059878A1 PCT/AU2012/001312 AU2012001312W WO2013059878A1 WO 2013059878 A1 WO2013059878 A1 WO 2013059878A1 AU 2012001312 W AU2012001312 W AU 2012001312W WO 2013059878 A1 WO2013059878 A1 WO 2013059878A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- cutting face
- splines
- fluid
- passage
- hole hammer
- Prior art date
Links
Classifications
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21B—EARTH DRILLING, e.g. DEEP 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 DRILLING; MINING
- E21B—EARTH DRILLING, e.g. DEEP 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
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21B—EARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B10/00—Drill bits
- E21B10/36—Percussion drill bits
- E21B10/38—Percussion drill bits characterised by conduits or nozzles for drilling fluids
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21B—EARTH DRILLING, e.g. DEEP 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
- E21B17/07—Telescoping joints for varying drill string lengths; Shock absorbers
- E21B17/076—Telescoping joints for varying drill string lengths; Shock absorbers between rod or pipe and drill bit
Definitions
- the present invention relates a down-the-hole hammer drill.
- This invention has particular application to a reverse-circulation (RC) down-hole face sampling hammer drill, and for illustrative purposes, reference will be made to this application.
- RC reverse-circulation
- a drill bit of a percussive down hole hammer (be it normal or reverse circulation (RC)) is conventionally provided with a bit body and splined shank. This shank locates within a splined drive sub, which in turn is threadably engaged to an end of a hammer barrel.
- the use of the spline between the drill bit and drive sub enables rotation of the drill bit with the hammer while at the same time allowing longitudinal movement of the drill bit with respect to the hammer. Examination of used RC bits very often indicates an uneven wear pattern of bit inserts and bit body.
- the invention may be said to reside in a percussive down hole hammer comprising a drill bit having a working face (or cutting face), the percussive down hole hammer further comprising means for preferentially directing a fluid to at least one portion of the cutting face in preference to other portions of the cutting face to flush the cutting face.
- the invention may be said to reside in a percussive down hole hammer comprising a drill bit having a cutting face and a means for delivering a fluid to the cutting face, the means and the cutting face being operatively complimentary for the purpose of flushing the cutting face using the fluid.
- the fluid is a flushing fluid and the cutting face is cleaned by the flushing of cuttings.
- delivery of fluid to the cutting face is tailored to the design of the cutting face to improve flushing of the cutting face.
- Air supply to a head of known down hole hammers is evenly distributed (i.e. via flow through spline channels in RC bits or flushing holes in conventional DTH bits), but because the working/cutting (or strike) face geometry is typically asymmetric, a considerable amount of air escapes via the sample tube and external annulus without affecting rock cuttings that are generated during the fracturing process.
- the immediate consequences are: > Reduction of drilling performance in the form of reduced penetration rate because of re- crushing of rock debris instead of cutting removal;
- the means for preferentially directing fluid to the cutting face preferentially directs fluid to portions of the cutting face having increased flushing needs.
- the means for preferentially directing fluid to the cutting face directs more fluid to portions of the cutting face having increased flushing needs than other portions of the cutting face.
- the load on a cutting face insert is the result of insert spacing combined with the fliiid flow at the cutting face. If the fluid at the rock-cutting face interface is properly directed, then the load on the individual inserts reduces, which ultimately leads to an increase in drilling performance.
- the means for preferentially directing fluid to the cutting face comprises at least one fluid passage (or channel).
- the means for preferentially directing fluid to the cutting face comprises at least two passages (or channels), where each channel directs fluid to a different portion of the cutting face, and at least one channel delivers a greater flow rate of fluid than the other.
- the percussive down hole hammer comprises a splined drive sub comprising driving splines abutting driven splines on a shank of the drill bit.
- the invention may be said to reside in a drill bit for the above described percussive down hole hammer.
- the invention may be said to reside in a drive sub for the above described percussive down hole hammer.
- the hammer is an RC hammer, and there is a channel defined between adjacent pairs of abutting splines, and fluid is supplied via the or each channel.
- the operating principle of RC hammers makes this invention particularly suitable for these.
- the main flow direction at the working (i.e. bit) face is from outside to inside, i.e. from the outer of the cutting face diameter inwards towards the hammer axis.
- the air distribution around the bit head is strongly affected by the flow field upstream of the cutting face and therefore offers potential to optimize the local supply of the flushing media to inserts with increased need for debris removal.
- not all channels are of equal dimensions.
- not all channels are equi-spaced around the circumference of the drill bit and drive sub. In one form, at least one channel is larger than others. In one form, at least one channel is wider than others. In one form, not all splines are of equal dimensions.
- not all splines are equi-spaced around the circumference of the drill bit and drive sub.
- at least one spline is larger than others, In one form, at least one spline is wider than others.
- the splines are not distributed symmetrically around their respective diameters.
- the pitch angle between two neighbouring splines varies as a function of angle on the circumference.
- a variation of the spline pitch angle and/or spline thickness of driving and/or driven splines may be limited to one or more sectors of the circumference or be continuous.
- the spline variations are incorporated in a way that the parts cannot be misassembled (e.g. relative position of drive-sub to shank).
- features such as notches or shoulders are used and positioned so that these prevent mis-assembly.
- one of each of the driving splines in these two pairs is considerably wider than the remainder of the driving splines.
- the larger channels are primary channels, and smaller channels are secondary channels.
- the primary channels direct fluid to sample holes in the cutting face.
- the primary channels direct fluid substantially orthogonal to sample holes in the cutting face.
- the means for preferentially directing fluid to the cutting face comprises more than one channel having an outlet in the cutting face.
- each outlet is a hole
- hole diameters are not constant but varying in size.
- the invention may be said to reside in a means for cleaning a cutting face of a percussive down hole hammer comprising a drill bit and a drive sub, wherein said means preferentially directs a fluid to at least one portion of the cutting face in preference to other portions of the cutting face.
- the invention may be said to reside in a down-the-hole hammer comprising a drill bit and a drive sub, the drill bit comprising a shank, and a head having a cutting face, the drive sub surrounding at least a portion of the shank and cooperating with the drill bit to form fluid passages extending lengthwise along the shank to direct fluid to the cutting face to flush this, where each passage directs fluid to a different portion of the cutting face, and at least one passage is adapted to deliver a greater flow rate of fluid than the others, thereby directing fluid to at least one portion of the cutting face in preference to other portions thereof.
- the invention may be said to reside in a drill bit for a down-the-hole hammer comprising a shank, a head having a cutting face, and fluid passages extending lengthwise along the shank to direct fluid to the cutting face to flush this, where each passage directs fluid to a different portion of the cutting face, and at least one passage is adapted to deliver a greater flow rate of fluid than the others, thereby directing fluid to at least one portion of the cutting face in preference to other portions thereof.
- the invention may be said to reside in a drive sub for a down-the-hole hammer having a drill bit comprising a shank, and a head having a cutting face, the drive sub surrounding at least a portion of the shank and cooperating with the drill bit to form fluid passages extending lengthwise along the shank to direct fluid to the cutting face to flush this, where each passage directs fluid to a different portion of the cutting face, and at least one passage is adapted to deliver a greater flow rate of fluid than the others, thereby directing fluid to at least one portion of the cutting face in preference to other portions thereof.
- Figure 1 is a perspective view of a drive sub
- Figure 2 is an end view of the drive sub of Figure 1;
- Figures 3 and 4 are perspective views of a drill bit
- Figure 5 is a perspective view of the assembled drive-sub and drill bit
- Figure 6 is a cross-sectional view, taken lengthwise, through the drive-sub and drill bit of Figure 5;
- Figure 7 is a cross-sectional view, taken crosswise, through the drive-sub and drill bit of Figure 5.
- drive-sub 10 for a pneumatically operated (i.e. in which air is the working and flushing fluid) percussive down hole RC hammer that combines the hammer (or hitting) action with the turning action of rotary drilling.
- This drive sub 10 comprises an annular sleeve 12 with an array of spaced apart, inwardly directed driving splines 14.
- the drill bit 20 for the RC hammer
- the drill bit 20 comprising a shank 22 and a drill bit head 23, the drill bit head 23 having a cutting face 21 with carbide inserts 29.
- the shank 22 comprises a number of outwardly directed driven splines 24, which are so spaced and numbered as to form, with the driving splines 14, pairs of splines having abutting cutting faces when the bit 20 is inserted into the drive sub 10 (see Figure 6).
- a channel 25 is defined between adjacent pairs of abutting splines 14 and 24 (see Figure 7).
- the driving splines 14 act against the driven splines 24 to drive rotation of the drill bit 20 while permitting the drill bit 20 to move longitudinally (under the effect of the hammer), with respect to the drive-sub 10.
- each of the driving splines 14a in these two pairs is considerably wider than the remainder of the driving splines 14.
- the two widest driving splines 14a locate between the most adjacently distant driven splines 24a and 24b so as to define between them a pair of passages (or channels) 25a which are larger (i.e. these are primary channels) than any of the other channels 25 (i.e. secondary channels) defined between adjacent pairs of abutting splines 14 and 24.
- the mass flow rate of air directed down through the channels is not the same for each channel, but a function of the channel size, so a greater mass flow rate of air is passed through the primary channels 25a than is passed through the secondary channels 25.
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)
- Processing Of Stones Or Stones Resemblance Materials (AREA)
Abstract
Description
Claims
Priority Applications (5)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
RU2014120989/03A RU2014120989A (en) | 2011-10-26 | 2012-10-26 | IMPROVEMENTS OF A SPLINED DEVICE FOR A RETURN CIRCULAR SHOCK DRILL |
CA2852971A CA2852971A1 (en) | 2011-10-26 | 2012-10-26 | Reverse circulation hammer spline arrangement improvements |
US14/353,503 US20140311807A1 (en) | 2011-10-26 | 2012-10-26 | Reverse circulation hammer spline arrangement improvements |
AU2012327872A AU2012327872A1 (en) | 2011-10-26 | 2012-10-26 | Reverse circulation hammer spline arrangement improvements |
ZA2014/03015A ZA201403015B (en) | 2011-10-26 | 2014-04-24 | Reverse circulation hammer spline arrangement improvements |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
AU2011904443 | 2011-10-26 | ||
AU2011904443A AU2011904443A0 (en) | 2011-10-26 | Rc hammer spline arrangement improvements |
Publications (1)
Publication Number | Publication Date |
---|---|
WO2013059878A1 true WO2013059878A1 (en) | 2013-05-02 |
Family
ID=48166950
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/AU2012/001312 WO2013059878A1 (en) | 2011-10-26 | 2012-10-26 | Reverse circulation hammer spline arrangement improvements |
Country Status (6)
Country | Link |
---|---|
US (1) | US20140311807A1 (en) |
AU (1) | AU2012327872A1 (en) |
CA (1) | CA2852971A1 (en) |
RU (1) | RU2014120989A (en) |
WO (1) | WO2013059878A1 (en) |
ZA (1) | ZA201403015B (en) |
Families Citing this family (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP3498967A4 (en) * | 2016-08-09 | 2020-03-18 | Mitsubishi Materials Corporation | Excavating tool |
Citations (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3991834A (en) * | 1975-07-07 | 1976-11-16 | Curington Alfred R | Sampling airhammer apparatus |
US4299298A (en) * | 1979-01-12 | 1981-11-10 | Boart International Limited | Down-the-hole drilling |
WO1990015220A1 (en) * | 1989-06-09 | 1990-12-13 | William Lister | Rock drilling bit |
US6702045B1 (en) * | 1999-09-22 | 2004-03-09 | Azuko Party Ltd | Drilling apparatus |
US20050199429A1 (en) * | 2001-11-13 | 2005-09-15 | Terlet Christopher J. | Transmission sleeve |
US20100252330A1 (en) * | 2007-08-21 | 2010-10-07 | Gilbert Andrew S | Down-hole Hammer Drill |
Family Cites Families (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
FR2686648B1 (en) * | 1992-01-27 | 1994-04-15 | Cogema Sa | DEVICE FOR ROTOPERCUTANT DRILLING WITH REVERSE FLUID CIRCULATION. |
-
2012
- 2012-10-26 WO PCT/AU2012/001312 patent/WO2013059878A1/en active Application Filing
- 2012-10-26 RU RU2014120989/03A patent/RU2014120989A/en not_active Application Discontinuation
- 2012-10-26 AU AU2012327872A patent/AU2012327872A1/en not_active Abandoned
- 2012-10-26 US US14/353,503 patent/US20140311807A1/en not_active Abandoned
- 2012-10-26 CA CA2852971A patent/CA2852971A1/en not_active Abandoned
-
2014
- 2014-04-24 ZA ZA2014/03015A patent/ZA201403015B/en unknown
Patent Citations (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3991834A (en) * | 1975-07-07 | 1976-11-16 | Curington Alfred R | Sampling airhammer apparatus |
US4299298A (en) * | 1979-01-12 | 1981-11-10 | Boart International Limited | Down-the-hole drilling |
WO1990015220A1 (en) * | 1989-06-09 | 1990-12-13 | William Lister | Rock drilling bit |
US6702045B1 (en) * | 1999-09-22 | 2004-03-09 | Azuko Party Ltd | Drilling apparatus |
US20050199429A1 (en) * | 2001-11-13 | 2005-09-15 | Terlet Christopher J. | Transmission sleeve |
US20100252330A1 (en) * | 2007-08-21 | 2010-10-07 | Gilbert Andrew S | Down-hole Hammer Drill |
Also Published As
Publication number | Publication date |
---|---|
CA2852971A1 (en) | 2013-05-02 |
RU2014120989A (en) | 2015-12-10 |
US20140311807A1 (en) | 2014-10-23 |
AU2012327872A1 (en) | 2014-05-08 |
ZA201403015B (en) | 2017-09-27 |
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