CA2271620C - Downhole magnetic debris collector - Google Patents
Downhole magnetic debris collector Download PDFInfo
- Publication number
- CA2271620C CA2271620C CA002271620A CA2271620A CA2271620C CA 2271620 C CA2271620 C CA 2271620C CA 002271620 A CA002271620 A CA 002271620A CA 2271620 A CA2271620 A CA 2271620A CA 2271620 C CA2271620 C CA 2271620C
- Authority
- CA
- Canada
- Prior art keywords
- housing
- debris collector
- debris
- magnets
- magnet assembly
- 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 - Lifetime
Links
- 238000000034 method Methods 0.000 claims abstract description 15
- 239000000463 material Substances 0.000 claims abstract description 5
- 239000003795 chemical substances by application Substances 0.000 claims description 12
- 230000007797 corrosion Effects 0.000 claims description 12
- 238000005260 corrosion Methods 0.000 claims description 12
- 230000002401 inhibitory effect Effects 0.000 claims description 12
- 125000006850 spacer group Chemical group 0.000 claims description 11
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical group [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 claims description 5
- 244000309464 bull Species 0.000 claims description 5
- 239000003921 oil Substances 0.000 claims description 5
- 229910052710 silicon Inorganic materials 0.000 claims description 5
- 239000010703 silicon Substances 0.000 claims description 5
- 238000007789 sealing Methods 0.000 claims description 2
- 230000015572 biosynthetic process Effects 0.000 description 2
- KPLQYGBQNPPQGA-UHFFFAOYSA-N cobalt samarium Chemical compound [Co].[Sm] KPLQYGBQNPPQGA-UHFFFAOYSA-N 0.000 description 1
- 239000010960 cold rolled steel Substances 0.000 description 1
- 238000005474 detonation Methods 0.000 description 1
- 238000003780 insertion Methods 0.000 description 1
- 230000037431 insertion Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 229910000938 samarium–cobalt magnet Inorganic materials 0.000 description 1
- 230000007704 transition Effects 0.000 description 1
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
- E21B43/00—Methods or apparatus for obtaining oil, gas, water, soluble or meltable materials or a slurry of minerals from wells
- E21B43/11—Perforators; Permeators
- E21B43/119—Details, e.g. for locating perforating place or direction
-
- 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
- E21B31/06—Fishing for or freeing objects in boreholes or wells using magnetic means
Abstract
A debris collector to collect falling metallic debris within a borehole casing following a casing perforation process includes an elongate housing having opposite ends. One end of the housing is adapted to be coupled to a string of at least one perforating gun. A magnet assembly is disposed within the housing. The magnet assembly generates a generally evenly distributed magnetic field generally along the length of the housing to catch falling metallic debris. The magnet assembly includes a plurality of magnets each of which is separated by a pole of magnetizable material. Successive magnets are oriented to generate magnetic fields of opposite polarity. A centralizer collar is coupled to an opposite end of the housing to position the debris collector centrally within the casing.
Description
DOWNHOLE MAGNETIC DEBRIS COLLECTOR
Field Of The Invention The present invention relates to a debris collector and in particular to a downhole magnetic debris collector to collect and remove metallic debris from within a borehole casing.
Background Of The Invention During completion of a well, a perforating gun is lowered into the casing that lines the borehole until it is positioned near the formation to be welled.
Once properly positioned, the perforating gun is detonated to perforate the casing so that the interior of the casing communicates with the formation.
During the casing perforation process, metallic debris can fall into the casing. This debris can cause damage to pumps lowered into the casing and to drill bits lowered into the casing if the borehole is to be continued. Accordingly, there exists a need to remove metallic debris from the casing resulting from the casing perforating process.
It is therefore an object of the present invention to provide a novel magnetic debris collector to collect metallic debris in a borehole casing allowing the debris to be removed.
Summary Of The Invention According to one aspect of the present invention there is provided a debris collector to collect metallic debris within a borehole casing comprising:
an elongate housing having one end adapted to be coupled to a perforating gun;
a magnet assembly within said housing, said magnet assembly generating a magnetic field to attract metallic debris; and a dampening and corrosion inhibiting agent within said housing.
In a preferred embodiment, the magnet assembly generates an evenly distributed magnetic field generally along the length of the housing and includes a plurality of magnets, each of which is separated by a spacer formed of magnetizable material. Successive magnets are oriented to generate magnetic fields of opposite polarity. The magnet assembly also includes a pair of end caps. Each end cap engages an opposite end of the housing to seal the same. The magnets and the poles have aligned passages therethrough into which the dampening and corrosion-inhibiting agent is injected.
According to another aspect of the present invention there is provided a debris collector to collect metallic debris within a borehole casing following a casing perforation process comprising:
an elongate housing having one end adapted to be coupled to a string inserted into said casing; and a magnet asseinbly within said housing and generating a generally evenly distributed magnetic field generally along the length of said housing to catch metallic debris, said magnet assembly being free with respect to the interior sidewall of said housing.
According to yet another aspect of the present invention there is provided a perforating gun and magnetic debris collector assembly to perforate a borehole casing and collect metallic debris within said borehole casing following a casing perforation process, said assembly comprising:
a perforating gun; and a magnetic debris collector coupled to said perforating gun and depending therefrom, said magnetic debris collector comprising:
an elongate housing having opposite ends, one end of said housing being coupled to a string of said perforating gun; and a magnet assembly accommodated by said housing, said magnet assembly generating a generally evenly distributed magnetic field generally along the length of said housing to catch metallic debris, said magnetic assembly comprising a plurality of magnets each of which is separated by a spacer of magnetizable material, successive magnets being oriented to generate magnetic fields of opposite polarity.
According to still yet another aspect of the present invention there is provided a method of assembling a debris collector comprising:
inserting a stack of alternating magnets and spacers into an open end of an elongate housing;
Field Of The Invention The present invention relates to a debris collector and in particular to a downhole magnetic debris collector to collect and remove metallic debris from within a borehole casing.
Background Of The Invention During completion of a well, a perforating gun is lowered into the casing that lines the borehole until it is positioned near the formation to be welled.
Once properly positioned, the perforating gun is detonated to perforate the casing so that the interior of the casing communicates with the formation.
During the casing perforation process, metallic debris can fall into the casing. This debris can cause damage to pumps lowered into the casing and to drill bits lowered into the casing if the borehole is to be continued. Accordingly, there exists a need to remove metallic debris from the casing resulting from the casing perforating process.
It is therefore an object of the present invention to provide a novel magnetic debris collector to collect metallic debris in a borehole casing allowing the debris to be removed.
Summary Of The Invention According to one aspect of the present invention there is provided a debris collector to collect metallic debris within a borehole casing comprising:
an elongate housing having one end adapted to be coupled to a perforating gun;
a magnet assembly within said housing, said magnet assembly generating a magnetic field to attract metallic debris; and a dampening and corrosion inhibiting agent within said housing.
In a preferred embodiment, the magnet assembly generates an evenly distributed magnetic field generally along the length of the housing and includes a plurality of magnets, each of which is separated by a spacer formed of magnetizable material. Successive magnets are oriented to generate magnetic fields of opposite polarity. The magnet assembly also includes a pair of end caps. Each end cap engages an opposite end of the housing to seal the same. The magnets and the poles have aligned passages therethrough into which the dampening and corrosion-inhibiting agent is injected.
According to another aspect of the present invention there is provided a debris collector to collect metallic debris within a borehole casing following a casing perforation process comprising:
an elongate housing having one end adapted to be coupled to a string inserted into said casing; and a magnet asseinbly within said housing and generating a generally evenly distributed magnetic field generally along the length of said housing to catch metallic debris, said magnet assembly being free with respect to the interior sidewall of said housing.
According to yet another aspect of the present invention there is provided a perforating gun and magnetic debris collector assembly to perforate a borehole casing and collect metallic debris within said borehole casing following a casing perforation process, said assembly comprising:
a perforating gun; and a magnetic debris collector coupled to said perforating gun and depending therefrom, said magnetic debris collector comprising:
an elongate housing having opposite ends, one end of said housing being coupled to a string of said perforating gun; and a magnet assembly accommodated by said housing, said magnet assembly generating a generally evenly distributed magnetic field generally along the length of said housing to catch metallic debris, said magnetic assembly comprising a plurality of magnets each of which is separated by a spacer of magnetizable material, successive magnets being oriented to generate magnetic fields of opposite polarity.
According to still yet another aspect of the present invention there is provided a method of assembling a debris collector comprising:
inserting a stack of alternating magnets and spacers into an open end of an elongate housing;
providing a dampening and corrosion inhibiting agent in said housing;
and sealing the open end.
The present invention provides advantages in that falling metallic debris within a borehole casing following a casing perforation process can be caught and removed. The magnetic assembly within the debris collector maintains a generally evenly distributed magnetic field along its length to enhance metallic debris collection.
Brief Description Of The Drawin2s An embodiment of the present invention will now be described more fully with reference to the accompanying drawings in which:
Figure 1 is a side elevational view of a magnetic debris collector in accordance with the present invention;
Figures 2a and 2b are side elevational and cross-sectional views respectively of a housing forming part of the magnetic debris collector of Figure 1;
Figure 3 is an exploded cross-sectional view of a magnet assembly forming part of the magnetic debris collector of Figure 1;
Figures 4a and 4b are side elevational and cross-sectional views respectively of an end cap forming part of the magnet assembly of Figure 3;
and Figure 5 is a cross-sectional view of the magnet assembly housing and the magnet assembly.
Detailed Description Of The Preferred Embodiment Turning now to Figures 1 to 5, a magnetic debris collector in accordance with the present invention is shown and is generally indicated to by reference numeral 10. As can be seen, magnetic debris collector 10 includes an elongate housing 12 having a threaded end 12a adapted to coupled to the bottom of a string of one or more perforating guns (not shown). The other threaded end 12b of the housing 12 is adapted to be coupled to accessories such as a centralizer collar 14 and a bull nose 16.
and sealing the open end.
The present invention provides advantages in that falling metallic debris within a borehole casing following a casing perforation process can be caught and removed. The magnetic assembly within the debris collector maintains a generally evenly distributed magnetic field along its length to enhance metallic debris collection.
Brief Description Of The Drawin2s An embodiment of the present invention will now be described more fully with reference to the accompanying drawings in which:
Figure 1 is a side elevational view of a magnetic debris collector in accordance with the present invention;
Figures 2a and 2b are side elevational and cross-sectional views respectively of a housing forming part of the magnetic debris collector of Figure 1;
Figure 3 is an exploded cross-sectional view of a magnet assembly forming part of the magnetic debris collector of Figure 1;
Figures 4a and 4b are side elevational and cross-sectional views respectively of an end cap forming part of the magnet assembly of Figure 3;
and Figure 5 is a cross-sectional view of the magnet assembly housing and the magnet assembly.
Detailed Description Of The Preferred Embodiment Turning now to Figures 1 to 5, a magnetic debris collector in accordance with the present invention is shown and is generally indicated to by reference numeral 10. As can be seen, magnetic debris collector 10 includes an elongate housing 12 having a threaded end 12a adapted to coupled to the bottom of a string of one or more perforating guns (not shown). The other threaded end 12b of the housing 12 is adapted to be coupled to accessories such as a centralizer collar 14 and a bull nose 16.
A magnet assembly 18 (best seen in Figures 3 to 5) is disposed within the housing 12. The magnet assembly 18 includes a stack 20 of annular magnets and poles 24 sandwiched between a pair of end caps 26. The magnets 22 are separated by the poles 24 and are arranged so that successive magnets present magnetic fields of alternate polarity. Each end cap 26 is positioned adjacent an opposite end of the housing 12 and has threads 28 on its outer surface. The threads 28 on each end cap 26 accommodate o-ring seals 30 and engage threads on the interior surface of the housing 12. Silicon oil fills the central passage 32 extending through magnet and pole stack 20 and acts as a dampening and corrosion-inhibiting agent.
The magnets 22 in this embodiment are formed of samarium cobalt.
The poles 24 are formed of cold rolled steel and are finished with a black oxide. The orientation of the magnets 22 and the provision of magnetizable poles 24 between the magnets result in an evenly distributed magnetic field being generated by the debris collector 10 along the length of the housing 12.
During assembly of the debris collector 10, the magnets 22 and poles 24 are stacked along a threaded rod in the desired configuration. Once the stack 20 of magnets 22 and poles 24 is complete, nuts are threaded onto the ends of the rod to maintain the magnets and poles in alignment. The threaded rod with the stack of magnets and poles is then inserted into the housing 12. At this stage, the nuts are removed from the threaded rod and the threaded rod is removed from the stack 20.
Following this, one of the end caps 26 is threaded into an end of the housing 12 and the housing is stood on its end with the open end up. The silicon oil is then injected into the passage 32 extending through the magnets 22 and poles 24. At this time, the remaining end cap 26 is threaded into the open end of the housing 12 thereby to seal the housing and complete assembly of the debris collector 10.
During use, a bull nose 16 and centralizer collar 14, of the correct size for the casing to be perforated, are threaded onto one end of the housing 12.
The other end of the housing 12 is then coupled to the bottom of a string of one or more perforating guns using a standard collar. At this time, the string is inserted into the casing, debris collector first, and is lowered until the perforating guns are properly positioned. Once positioned, the perforating guns are detonated to perforate the casing. Metallic debris resulting from the casing perforating process that falls down into the casing, is caught by the large magnetic field generated by the debris collector and pulled towards the housing 12. As a result, the metallic debris accumulates on the outside of the housing 12. Since the magnetic field is evenly distributed over the length of the housing 12, the volume of debris that can be caught and held by the 5 debris collector 10 is maximized.
After the detonation process, the debris collector 10 is removed from the casing and the metallic debris accumulated on the outer housing is removed. The debris collector 10 is then ready for reuse.
The bull nose 16 is used to facilitate insertion of the string into the 10 casing and to provide a relatively smooth transition to the centralizer collar 14. The centralizer collar 14 is used to keep the debris collector 10 centrally positioned within the casing to enhance its ability to collect falling metallic debris, to inhibit the debris collector 10 from sticking to the casing wall due to the magnetic field, and to inhibit debris accumulated on the outer surface of housing 12 from being dislodged as the debris collector 10 is removed from the casing.
As will be appreciated, the debris collector 10 allows metallic debris falling down the casing to be caught and removed following a casing perforating process. The evenly distributed magnetic field, which is generated along the length of the debris collector 10, enhances metallic debris collection.
Although a preferred embodiment of the present invention has been described, those of skill in the art will appreciate that variations and modifications may be made without departing from the spirit and scope thereof as defined by the appended claims.
The magnets 22 in this embodiment are formed of samarium cobalt.
The poles 24 are formed of cold rolled steel and are finished with a black oxide. The orientation of the magnets 22 and the provision of magnetizable poles 24 between the magnets result in an evenly distributed magnetic field being generated by the debris collector 10 along the length of the housing 12.
During assembly of the debris collector 10, the magnets 22 and poles 24 are stacked along a threaded rod in the desired configuration. Once the stack 20 of magnets 22 and poles 24 is complete, nuts are threaded onto the ends of the rod to maintain the magnets and poles in alignment. The threaded rod with the stack of magnets and poles is then inserted into the housing 12. At this stage, the nuts are removed from the threaded rod and the threaded rod is removed from the stack 20.
Following this, one of the end caps 26 is threaded into an end of the housing 12 and the housing is stood on its end with the open end up. The silicon oil is then injected into the passage 32 extending through the magnets 22 and poles 24. At this time, the remaining end cap 26 is threaded into the open end of the housing 12 thereby to seal the housing and complete assembly of the debris collector 10.
During use, a bull nose 16 and centralizer collar 14, of the correct size for the casing to be perforated, are threaded onto one end of the housing 12.
The other end of the housing 12 is then coupled to the bottom of a string of one or more perforating guns using a standard collar. At this time, the string is inserted into the casing, debris collector first, and is lowered until the perforating guns are properly positioned. Once positioned, the perforating guns are detonated to perforate the casing. Metallic debris resulting from the casing perforating process that falls down into the casing, is caught by the large magnetic field generated by the debris collector and pulled towards the housing 12. As a result, the metallic debris accumulates on the outside of the housing 12. Since the magnetic field is evenly distributed over the length of the housing 12, the volume of debris that can be caught and held by the 5 debris collector 10 is maximized.
After the detonation process, the debris collector 10 is removed from the casing and the metallic debris accumulated on the outer housing is removed. The debris collector 10 is then ready for reuse.
The bull nose 16 is used to facilitate insertion of the string into the 10 casing and to provide a relatively smooth transition to the centralizer collar 14. The centralizer collar 14 is used to keep the debris collector 10 centrally positioned within the casing to enhance its ability to collect falling metallic debris, to inhibit the debris collector 10 from sticking to the casing wall due to the magnetic field, and to inhibit debris accumulated on the outer surface of housing 12 from being dislodged as the debris collector 10 is removed from the casing.
As will be appreciated, the debris collector 10 allows metallic debris falling down the casing to be caught and removed following a casing perforating process. The evenly distributed magnetic field, which is generated along the length of the debris collector 10, enhances metallic debris collection.
Although a preferred embodiment of the present invention has been described, those of skill in the art will appreciate that variations and modifications may be made without departing from the spirit and scope thereof as defined by the appended claims.
Claims (24)
1. A debris collector to collect metallic debris within a borehole casing comprising:
an elongate housing having one end adapted to be coupled to a perforating gun;
a magnet assembly within said housing, said magnet assembly generating a magnetic field to attract metallic debris; and a dampening and corrosion inhibiting agent within said housing.
an elongate housing having one end adapted to be coupled to a perforating gun;
a magnet assembly within said housing, said magnet assembly generating a magnetic field to attract metallic debris; and a dampening and corrosion inhibiting agent within said housing.
2. A debris collector according to claim 1 wherein said magnet assembly generates an evenly distributed magnetic field generally along the length of said housing.
3. A debris collector according to claim 2 wherein said magnet assembly includes a plurality of magnets each of which is separated by a spacer formed of magnetizable material, successive magnets being oriented to generate magnetic fields of opposite polarity.
4. A debris collector according to claim 3 wherein said magnet assembly further includes a pair of end caps, each of said end caps engaging an opposite end of said housing to seal the same.
5. A debris collector according to claim 3 or 4 wherein each of said magnets and spacers has a passage therethrough, said passages being generally aligned and being filled with said dampening and corrosion inhibiting agent.
6. A debris collector according to claim 5 wherein said passages are centrally positioned and wherein said dampening and corrosion inhibiting agent is silicon oil.
7. A debris collector according to any one of claims 2 to 6 further comprising an accessory coupled to an end of said elongate housing opposite said one end.
8. A debris collector according to claim 7 wherein said accessory is a centering device.
9. A debris collector according to any one of claims 1 to 7 wherein the outer surface of the magnet assembly is free with respect to the interior sidewall of said housing.
10. A debris collector to collect metallic debris within a borehole casing following a casing perforation process comprising:
an elongate housing having one end adapted to be coupled to a string inserted into said casing; and a magnet assembly within said housing and generating a generally evenly distributed magnetic field generally along the length of said housing to catch metallic debris, said magnet assembly being free with respect to the interior sidewall of said housing.
an elongate housing having one end adapted to be coupled to a string inserted into said casing; and a magnet assembly within said housing and generating a generally evenly distributed magnetic field generally along the length of said housing to catch metallic debris, said magnet assembly being free with respect to the interior sidewall of said housing.
11. A debris collector according to claim 10 wherein said magnet assembly comprises an alternating arrangement of magnets and spacers, successive magnets being oriented to generate magnetic fields of opposite polarity.
12. A debris collector according to claim 10 or 11 wherein said magnet assembly further includes a pair of end caps, each of said end caps engaging an opposite end of said housing to seal the same.
13. A debris collector according to claim 11 or 12 wherein each of said magnets and spacers has a passage therethrough, said passages being generally aligned and being filled with a dampening and corrosion inhibiting agent.
14. A debris collector according to any one of claims 10 to 13 further comprising a centering device coupled to an end of said housing opposite said one end to space said housing from said casing.
15. A debris collector according to claim 14 further comprising a bull nose coupled to an end of said centering device.
16. A debris collector according to claim 13 wherein said passages are centrally positioned and wherein said dampening and corrosion inhibiting agent is silicon oil.
17. A perforating gun and magnetic debris collector assembly to perforate a borehole casing and collect metallic debris within said borehole casing following a casing perforation process, said assembly comprising:
a perforating gun; and a magnetic debris collector coupled to said perforating gun and depending therefrom, said magnetic debris collector comprising:
an elongate housing having opposite ends, one end of said housing being coupled to a string of said perforating gun; and a magnet assembly accommodated by said housing, said magnet assembly generating a generally evenly distributed magnetic field generally along the length of said housing to catch metallic debris, said magnetic assembly comprising a plurality of magnets each of which is separated by a spacer of magnetizable material, successive magnets being oriented to generate magnetic fields of opposite polarity.
a perforating gun; and a magnetic debris collector coupled to said perforating gun and depending therefrom, said magnetic debris collector comprising:
an elongate housing having opposite ends, one end of said housing being coupled to a string of said perforating gun; and a magnet assembly accommodated by said housing, said magnet assembly generating a generally evenly distributed magnetic field generally along the length of said housing to catch metallic debris, said magnetic assembly comprising a plurality of magnets each of which is separated by a spacer of magnetizable material, successive magnets being oriented to generate magnetic fields of opposite polarity.
18. The assembly of claim 17 further comprising a centering device coupled to another end of said housing to position centrally said debris collector within said casing.
19. The assembly of claim 18 further comprising a bull nose connected to an end of said centering device.
20. A debris collector according to any one of claims 17 to 19 wherein each of said magnets and spacers has a passage therethrough, said passages being generally aligned and being filled with a dampening and corrosion inhibiting agent.
21. The assembly of claim 20 wherein said passages are centrally positioned and wherein said dampening and corrosion inhibiting agent is silicon oil.
22. A method of assembling a debris collector comprising:
inserting a stack of alternating magnets and spacers into an open end of an elongate housing;
providing a dampening and corrosion inhibiting agent in said housing;
and sealing the open end.
inserting a stack of alternating magnets and spacers into an open end of an elongate housing;
providing a dampening and corrosion inhibiting agent in said housing;
and sealing the open end.
23. The method of claim 23 wherein said inserting comprises:
stacking the magnets and spacers on a rod to form the stack;
inserting the stack and rod into the housing; and then removing the rod from the housing.
stacking the magnets and spacers on a rod to form the stack;
inserting the stack and rod into the housing; and then removing the rod from the housing.
24. The method of claim 24 wherein said stacking comprises:
orienting the magnets such that the poles of successive magnets are of opposite polarity.
orienting the magnets such that the poles of successive magnets are of opposite polarity.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CA002271620A CA2271620C (en) | 1999-05-14 | 1999-05-14 | Downhole magnetic debris collector |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CA002271620A CA2271620C (en) | 1999-05-14 | 1999-05-14 | Downhole magnetic debris collector |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CA2271620A1 CA2271620A1 (en) | 2000-11-14 |
| CA2271620C true CA2271620C (en) | 2007-10-23 |
Family
ID=29588988
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA002271620A Expired - Lifetime CA2271620C (en) | 1999-05-14 | 1999-05-14 | Downhole magnetic debris collector |
Country Status (1)
| Country | Link |
|---|---|
| CA (1) | CA2271620C (en) |
Families Citing this family (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP1685308B1 (en) * | 2003-09-27 | 2007-10-10 | Dynaenergetics GmbH & Co. KG | Perforation gun system producing self-closing perforation holes |
| DE102004043948A1 (en) * | 2003-09-27 | 2005-05-25 | Dynaenergetics Gmbh & Co. Kg | Perforation gun used in well drill hole explosions in the crude oil and natural gas industry comprises elements for automatically closing the perforation holes and consisting of cartridges containing a swellable two-component foam |
| GB2485392B (en) * | 2010-11-12 | 2016-05-25 | M-I Drilling Fluids U K Ltd | Modular tool for wellbore cleaning and method of use |
| WO2017014741A1 (en) * | 2015-07-20 | 2017-01-26 | Halliburton Energy Services Inc. | Low-debris low-interference well perforator |
| CN108843266B (en) * | 2018-07-19 | 2023-09-26 | 北京泰利新能源科技发展有限公司 | Drilling fisher and method |
| US11578549B2 (en) | 2019-05-14 | 2023-02-14 | DynaEnergetics Europe GmbH | Single use setting tool for actuating a tool in a wellbore |
| US11255147B2 (en) | 2019-05-14 | 2022-02-22 | DynaEnergetics Europe GmbH | Single use setting tool for actuating a tool in a wellbore |
| US10927627B2 (en) | 2019-05-14 | 2021-02-23 | DynaEnergetics Europe GmbH | Single use setting tool for actuating a tool in a wellbore |
| US11753889B1 (en) | 2022-07-13 | 2023-09-12 | DynaEnergetics Europe GmbH | Gas driven wireline release tool |
-
1999
- 1999-05-14 CA CA002271620A patent/CA2271620C/en not_active Expired - Lifetime
Also Published As
| Publication number | Publication date |
|---|---|
| CA2271620A1 (en) | 2000-11-14 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| EEER | Examination request | ||
| MKEX | Expiry |
Effective date: 20190514 |