CA1261819A - Extraction device for pneumatically actuated drilling tools - Google Patents
Extraction device for pneumatically actuated drilling toolsInfo
- Publication number
- CA1261819A CA1261819A CA000533480A CA533480A CA1261819A CA 1261819 A CA1261819 A CA 1261819A CA 000533480 A CA000533480 A CA 000533480A CA 533480 A CA533480 A CA 533480A CA 1261819 A CA1261819 A CA 1261819A
- Authority
- CA
- Canada
- Prior art keywords
- hammer
- extraction device
- carrier
- sleeve
- fluid
- 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.)
- Expired
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
- E21B31/00—Fishing for or freeing objects in boreholes or wells
- E21B31/107—Fishing for or freeing objects in boreholes or wells using impact means for releasing stuck parts, e.g. jars
- E21B31/113—Fishing for or freeing objects in boreholes or wells using impact means for releasing stuck parts, e.g. jars hydraulically-operated
-
- 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
Abstract
A B S T R A C T
The invention relates to an extraction device used for extracting pneumatically actuated impact tools and the like from boreholes.
The device includes a carrier member 1, a reciprocable hammer 2, and a sleeve 13. The carrier is adapted to be connected to a drill rod section.
Reciprocation of the hammer relative to the carrier may be used to effect extraction. Fluid passages are provided for conveying fluid under pressure through the device in order to cause the hammer to reciprocate.
The invention relates to an extraction device used for extracting pneumatically actuated impact tools and the like from boreholes.
The device includes a carrier member 1, a reciprocable hammer 2, and a sleeve 13. The carrier is adapted to be connected to a drill rod section.
Reciprocation of the hammer relative to the carrier may be used to effect extraction. Fluid passages are provided for conveying fluid under pressure through the device in order to cause the hammer to reciprocate.
Description
THIS INVENTION relates to a device for extracting pneumatically actuated impact tools and the like from boreholes.
"Down-the-hole" drilling tools are often lost, or are retrieved at a great expense, when they jam down the borehole wherein they are operating. This generally occurs due to excavated material lodging or packing around the drilling tools or around drill rods which supply the operating fluid to the drilling tool. Drill rod sections are in threaded engagement with each other and frequently, attempts to extract the drilling tool by pulling on the drill rod simply causes the threads between individual drill rod sections to shear.
It is an object of this invention to provide means for assisting in the extraction of drill rods and drilling tools from boreholes.
According to the invention there is provided an extraction device for use in extracting a drlll rod and drilling tools from a borehole comprising a hammer carrier adapted to be connected :
~6~
to a drill rod section, the carrier including a striking surface, a hammer having upper and lower ends reciprocably moveable with respect to the carrier between a striking position adiacent the striking surface and a position removed therefrom, fluid flow paths in the carrier adapted to convey activating fluid to cause reciprocation, momentum of the hammer on striking the striking surface in use being transmitted to the drill rod to urge the drill rod and drilling tool out of the borehole, and a sleeve encapsulating the hammer and defining upper and lower chambers between the inner walls of the sleeve, the hammer carrier, and the upper and lower ends of the hammer respectively, the fluid flow paths directing fluid in use to either the upper or lower chamber depending on the position of the hammer, at least one exhaust port being defined in t.he wall of the sleeve.
There will probably be ~wo exhaust ports, spaced apart in a vertical direction.
jm:jrc The acGompanying drawings shows an extraction device according to the invention, the drawings being a cro~s-sectional side view of the device, the left hand side of the drawing showing the hammer in a striking position and ~he right hand side of the drawing showing the hammer in a position removed from the striking position.
Referrin~ to the dr~wing, the extraction device shown includes as ~ubular carrier membar 1 which carries a sleeve hammer 2, the hammer being movable between upper and lower stop formation~ numbered 3 and 4 respectively. The upper stop formation 3 is in the form of a cullar ~ecured to the carrier member 1 and the lower stop formation 4 is formed b~ an enlarged lower end of the carrier member. The upper stop formation defines a striking surface 8 for the hammer.
An axial bore 5 passes down the centre of the carrier member for conveying activatin~ fluid. Lateral port~ 6 are formed in the carrier member jm:jrc ~`
for conveying the fluid from the axial bore 5 to the hammer 2~ A
constriction plug 7 limits the rate of excess fluid which can pass through the device.
A sleeve 13 is mounted to ~he carrier member and encapsulates the hammer. The sleeve has an inwardly directed ~lange 14 on the upper end thereof which locate~ in a recess 15 in the collar 3. The lower end of the sleeve engages with the enlarged end 4 of the carrier member.
The sleeve, carrier member, and hammer together define an upper chaMber 10 and a lower chamber 9. The hammer has a recess 16 in the inner wall thereof for conveying fluid from the lateral ports 6 to the chambers.
The sleeve 13 has upper and lower exhaust ports, numbered 11 and 12 respectively.
Referring initially to the let hand side of the dra~ing, the hammer is ~hown in its striking jm:jrc ` -position in striking contact with the striking surface 8. In this position fluid under pressure is conveyed through lateral port 6~ through recess 16 to the upper chamber 10. This fluid will urge ~he hammer away from the striking surface 8. It will be noted ~hat the lower chamber 9 is open to atmosphere through exhaust port 12 whil~t the hammer is in this striking position, and the pressure in this lower chamber is thus low.
When the hammer is in the lower position as 3hown in the right hand side of the drawings, the lower chamber 9 i~
sealed and fluid under pressure is introduced into the lower chamber through lateral ports 6 and recess 16. The upper chamber, with the hammer in this position is open ~o atmosphere through upper exhaust port 11. The high pressure fluid will urge the hammer upwards towards the striking ~urface 8~
It will be appreciated that the hammer will automatically reciprocate between the two extreme posi~ionq resulting in drilling tools to which the device is æecured being extracted from a drilling hole in u~e.
1~ .
jm:jrc
"Down-the-hole" drilling tools are often lost, or are retrieved at a great expense, when they jam down the borehole wherein they are operating. This generally occurs due to excavated material lodging or packing around the drilling tools or around drill rods which supply the operating fluid to the drilling tool. Drill rod sections are in threaded engagement with each other and frequently, attempts to extract the drilling tool by pulling on the drill rod simply causes the threads between individual drill rod sections to shear.
It is an object of this invention to provide means for assisting in the extraction of drill rods and drilling tools from boreholes.
According to the invention there is provided an extraction device for use in extracting a drlll rod and drilling tools from a borehole comprising a hammer carrier adapted to be connected :
~6~
to a drill rod section, the carrier including a striking surface, a hammer having upper and lower ends reciprocably moveable with respect to the carrier between a striking position adiacent the striking surface and a position removed therefrom, fluid flow paths in the carrier adapted to convey activating fluid to cause reciprocation, momentum of the hammer on striking the striking surface in use being transmitted to the drill rod to urge the drill rod and drilling tool out of the borehole, and a sleeve encapsulating the hammer and defining upper and lower chambers between the inner walls of the sleeve, the hammer carrier, and the upper and lower ends of the hammer respectively, the fluid flow paths directing fluid in use to either the upper or lower chamber depending on the position of the hammer, at least one exhaust port being defined in t.he wall of the sleeve.
There will probably be ~wo exhaust ports, spaced apart in a vertical direction.
jm:jrc The acGompanying drawings shows an extraction device according to the invention, the drawings being a cro~s-sectional side view of the device, the left hand side of the drawing showing the hammer in a striking position and ~he right hand side of the drawing showing the hammer in a position removed from the striking position.
Referrin~ to the dr~wing, the extraction device shown includes as ~ubular carrier membar 1 which carries a sleeve hammer 2, the hammer being movable between upper and lower stop formation~ numbered 3 and 4 respectively. The upper stop formation 3 is in the form of a cullar ~ecured to the carrier member 1 and the lower stop formation 4 is formed b~ an enlarged lower end of the carrier member. The upper stop formation defines a striking surface 8 for the hammer.
An axial bore 5 passes down the centre of the carrier member for conveying activatin~ fluid. Lateral port~ 6 are formed in the carrier member jm:jrc ~`
for conveying the fluid from the axial bore 5 to the hammer 2~ A
constriction plug 7 limits the rate of excess fluid which can pass through the device.
A sleeve 13 is mounted to ~he carrier member and encapsulates the hammer. The sleeve has an inwardly directed ~lange 14 on the upper end thereof which locate~ in a recess 15 in the collar 3. The lower end of the sleeve engages with the enlarged end 4 of the carrier member.
The sleeve, carrier member, and hammer together define an upper chaMber 10 and a lower chamber 9. The hammer has a recess 16 in the inner wall thereof for conveying fluid from the lateral ports 6 to the chambers.
The sleeve 13 has upper and lower exhaust ports, numbered 11 and 12 respectively.
Referring initially to the let hand side of the dra~ing, the hammer is ~hown in its striking jm:jrc ` -position in striking contact with the striking surface 8. In this position fluid under pressure is conveyed through lateral port 6~ through recess 16 to the upper chamber 10. This fluid will urge ~he hammer away from the striking surface 8. It will be noted ~hat the lower chamber 9 is open to atmosphere through exhaust port 12 whil~t the hammer is in this striking position, and the pressure in this lower chamber is thus low.
When the hammer is in the lower position as 3hown in the right hand side of the drawings, the lower chamber 9 i~
sealed and fluid under pressure is introduced into the lower chamber through lateral ports 6 and recess 16. The upper chamber, with the hammer in this position is open ~o atmosphere through upper exhaust port 11. The high pressure fluid will urge the hammer upwards towards the striking ~urface 8~
It will be appreciated that the hammer will automatically reciprocate between the two extreme posi~ionq resulting in drilling tools to which the device is æecured being extracted from a drilling hole in u~e.
1~ .
jm:jrc
Claims (18)
PROPERTY OF PRIVILEGE IS CLAIMED ARE DEFINED AS FOLLOWS:
1. An extraction device for use in extracting a drill rod and a drilling tool from a borehole, comprising:
a hammer carrier adapted to be connected to a drill rod section, said carrier including a striking surface;
a hammer having upper and lower ends reciprocably moveable with respect to the carrier between a striking position adjacent said striking surface and a position removed therefrom;
fluid flow paths in said carrier for conveying activating fluid to cause reciprocation, momentum of said hammer on striking the striking surface in use being transmitted to said drill rod to urge said drill rod and the drilling tool out of the borehole; and a sleeve encapsulating said hammer and defining upper and lower chambers between inner walls of said sleeve, said hammer carrier, and said upper and lower ends of said hammer respectively, said fluid flow paths directing fluid in use to either said upper or lower chamber depending on the position of the hammer, and said sleeve having in the wall thereof at least one exhaust port.
a hammer carrier adapted to be connected to a drill rod section, said carrier including a striking surface;
a hammer having upper and lower ends reciprocably moveable with respect to the carrier between a striking position adjacent said striking surface and a position removed therefrom;
fluid flow paths in said carrier for conveying activating fluid to cause reciprocation, momentum of said hammer on striking the striking surface in use being transmitted to said drill rod to urge said drill rod and the drilling tool out of the borehole; and a sleeve encapsulating said hammer and defining upper and lower chambers between inner walls of said sleeve, said hammer carrier, and said upper and lower ends of said hammer respectively, said fluid flow paths directing fluid in use to either said upper or lower chamber depending on the position of the hammer, and said sleeve having in the wall thereof at least one exhaust port.
2. The extraction device as claimed in claim 1, wherein said wall of said sleeve has at least two exhaust ports, vertically spaced apart.
3. An extraction device as claimed in claim 1, including fluid flow paths in said hammer for conveying the activating fluid.
4. An extraction device as claimed in claim 2, including fluid flow paths in said hammer for conveying the activating fluid.
5. The extraction device of claim 1, wherein said carrier member is provided with an axial bore and lateral ports communicating with said axial bore, said lateral ports being between said lower and said upper exhaust ports.
6. The extraction device of claim 4, wherein said carrier member is provided with an axial bore and lateral ports communicating with said axial bore, said lateral ports being between said lower and said upper exhaust ports, for conveying fluid from said axial bore to said hammer.
7. The extraction device of claim 1, including a constriction plug for limiting the rate of excess fluid which can pass through the device.
8. The extraction device of claim 1, including a collar having a recess and an inwardly directed flange on the upper end of said sleeve receivable in said recess.
9. The extraction device of claim 7, including a collar having a recess and an inwardly directed flange on the upper end of said sleeve receivable in said recess.
10. The extraction device of claim 1, wherein said carrier member has an enlarged end, and the lower end of said sleeve engages with said enlarged end.
11. The extraction device of claim 9, wherein said carrier member has an enlarged end, and the lower end of said sleeve engages with said enlarged end.
12. An extraction device for use in extracting a drill rod and a drilling tool from a borehole, comprising:
a hammer carrier adapted to be connected to a drill rod section, said carrier including a striking surface;
a hammer reciprocably movable with respect to said carrier between a striking position adjacent said striking surface and a position removed therefrom;
fluid flow paths in said carrier for conveying activating fluid to cause reciprocation, momentum of said hammer on striking the striking surface in use being transmitted to the drill rod to urge said drill rod and the drilling tool out of said borehole; and a sleeve having in the wall thereof at least one exhaust port, said sleeve encapsulating said hammer and defining upper and lower chambers between inner walls of said sleeve, said hammer carrier, and said upper and lower ends of the hammer respectively, said fluid flow paths directing fluid in use to one of the upper and lower chambers depending on the position of the hammer.
a hammer carrier adapted to be connected to a drill rod section, said carrier including a striking surface;
a hammer reciprocably movable with respect to said carrier between a striking position adjacent said striking surface and a position removed therefrom;
fluid flow paths in said carrier for conveying activating fluid to cause reciprocation, momentum of said hammer on striking the striking surface in use being transmitted to the drill rod to urge said drill rod and the drilling tool out of said borehole; and a sleeve having in the wall thereof at least one exhaust port, said sleeve encapsulating said hammer and defining upper and lower chambers between inner walls of said sleeve, said hammer carrier, and said upper and lower ends of the hammer respectively, said fluid flow paths directing fluid in use to one of the upper and lower chambers depending on the position of the hammer.
13. The extraction device as claimed in claim 12, wherein said wall of said sleeve has at least two exhaust ports, vertically spaced apart.
14. The extraction device of claim 12, wherein said fluid flow paths include a recess in the inner wall of said hammer.
15. The extraction device of claim 12, wherein said carrier member is provided with an axial bore and lateral ports communicating with said axial bore, said lateral ports being between said lower and said upper exhaust ports.
16. The extraction device of claim 12, wherein said fluid flow paths include a recess in the inner wall of said hammer.
17. The extraction device of claim 15, including a constriction plug limiting the rate of excess fluid which can pass through the device.
18. The extraction device of claim 12, wherein said carrier member has an enlarged end, and the lower end of said sleeve engages with said enlarged end.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB8707284A GB2192215B (en) | 1987-03-26 | 1987-03-26 | Improvements relating to extraction device for pneumatically actuated drilling tools |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA1261819A true CA1261819A (en) | 1989-09-26 |
Family
ID=10614719
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA000533480A Expired CA1261819A (en) | 1987-03-26 | 1987-03-31 | Extraction device for pneumatically actuated drilling tools |
Country Status (4)
| Country | Link |
|---|---|
| AU (1) | AU576694B1 (en) |
| CA (1) | CA1261819A (en) |
| GB (1) | GB2192215B (en) |
| SE (1) | SE467009B (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103437732B (en) * | 2013-08-07 | 2015-11-11 | 中国地质大学（武汉） | A kind of downhole pneumatic shock wave generator |
| CN108360974B (en) * | 2018-04-12 | 2023-10-13 | 中国石油大学(北京) | Composite impact tool |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4346770A (en) * | 1980-10-14 | 1982-08-31 | Halliburton Company | Hydraulic jarring tool |
| AU1888083A (en) * | 1982-08-02 | 1984-02-23 | Newman, J.L. | Hydraulic drilling jar |
-
1987
- 1987-03-26 GB GB8707284A patent/GB2192215B/en not_active Expired - Lifetime
- 1987-03-27 AU AU70711/87A patent/AU576694B1/en not_active Ceased
- 1987-03-30 SE SE8701316A patent/SE467009B/en not_active IP Right Cessation
- 1987-03-31 CA CA000533480A patent/CA1261819A/en not_active Expired
Also Published As
| Publication number | Publication date |
|---|---|
| SE467009B (en) | 1992-05-11 |
| GB2192215B (en) | 1990-10-31 |
| SE8701316L (en) | 1988-10-01 |
| GB2192215A (en) | 1988-01-06 |
| GB8707284D0 (en) | 1987-04-29 |
| AU576694B1 (en) | 1988-09-01 |
| SE8701316D0 (en) | 1987-03-30 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| MKEX | Expiry |