CA2528467C - Magnetic separation in fluids - Google Patents
Magnetic separation in fluids Download PDFInfo
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- CA2528467C CA2528467C CA 2528467 CA2528467A CA2528467C CA 2528467 C CA2528467 C CA 2528467C CA 2528467 CA2528467 CA 2528467 CA 2528467 A CA2528467 A CA 2528467A CA 2528467 C CA2528467 C CA 2528467C
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Abstract
Methods and apparatus are disclosed for recovering magnetically attractable wellbore casing fragments from drilling fluid used in hydrocarbon-producing formations.
Description
MAGNETIC SEPARATION IN FLUIDS
FIELD OF THE INVENTION
The present invention relates to an apparatus and methods for recovering magnetically attractable articles from fluid, and more particularly to an apparatus and methods for recovering magnetically attractable fragments from fluid in oil and gas well casings to determine the metal loss from the well casing.
BACKGROUND OF THE INVENTION
Casings used to line wells in oil- and gas-producing formations typically suffer damage from erosion, perforation (such as for the purpose of running additional lines into such a formation), and ordinary wear and tear from the operation of the wells.
Since the integrity of well casing is important to the integrity of the well, monitoring the condition of well casing is an important part of well maintenance.
Drilling fluid is circulated in well casing for purposes including removing drill cuttings from the casing and the face of the bit, so one way to monitor the condition of the casing is to collect and analyze the casing fragments released into the drilling fluid. The quantity of casing fragments collected from the drilling fluid is indicative of the quantity of fragments being generated down hole.
Solids and cuttings are generally removed from drilling fluids at the surface by solids control equipment such as shale shakers and hydrocyclones, which dump solids into collection bins. It is known to place a "ditch magnet" into the drilling fluid system to collect casing fragments from the drilling fluids. The typical ditch magnet is heavy, and requires at least two persons to lower it into the drilling fluid stream.
As metal fragments adhere to the ditch magnet, the device becomes even heavier and difficult DMSLegal\055650\00001 \2212682v t for personnel to remove. Removal of the metal particles from the ditch magnet is difficult because of the strong magnetic field, which can also result in the magnetization of handles or other features of the device. Drilling personnel usually run their hands over the surface of the ditch magnet in an effort to strip the magnetic materials from the magnet. This process is slow and laborious, and the amount of metal fragments retrieved and therefore the accuracy of the calculation of total metal loss in the casing depends on the skill and thoroughness of the personnel removing the fragments from the ditch magnets. Another known method of fragment removal employs shrouded or sheathed magnets in a non-magnetic housing which includes a lid connectable to the housing so that the magnets are removable from the housing.
By removing the magnets from the housing, the housing can be demagnetized to facilitate collection of the metal filings from the exterior surface of the housing.
However, the connection between the lid and the housing can become fouled by drilling mud and metal filings so that the reconnection of the lid to the housing becomes difficult. There is a need for an apparatus and method for inexpensive removal of casing fragments from drilling fluids without the disadvantages of the known devices and methods.
SUMMARY OF THE INVENTION
The present invention is directed to methods and apparatus for removing casing fragments from fluids circulated in hydrocarbon-producing wells which meets the need identified above. In one aspect, the invention is directed to a method for monitoring the condition of well casing by recovering magnetically attractable casing fragments from fluid in a vessel having an upper end, including placing a reusable magnetic separator in the fluid in the vessel, wherein the separator includes a magnetic body, at least one nonmagnetic end contiguous to the body, an exterior surface spanning the body and nonmagnetic end, and a hanger; retaining the separator in the fluid for a selected period of time; removing the separator from the vessel;
and urging the casing fragments along the exterior surface of the separator to the nonmagnetic end DMS Le ga I\055650\00001 \2212682v I
FIELD OF THE INVENTION
The present invention relates to an apparatus and methods for recovering magnetically attractable articles from fluid, and more particularly to an apparatus and methods for recovering magnetically attractable fragments from fluid in oil and gas well casings to determine the metal loss from the well casing.
BACKGROUND OF THE INVENTION
Casings used to line wells in oil- and gas-producing formations typically suffer damage from erosion, perforation (such as for the purpose of running additional lines into such a formation), and ordinary wear and tear from the operation of the wells.
Since the integrity of well casing is important to the integrity of the well, monitoring the condition of well casing is an important part of well maintenance.
Drilling fluid is circulated in well casing for purposes including removing drill cuttings from the casing and the face of the bit, so one way to monitor the condition of the casing is to collect and analyze the casing fragments released into the drilling fluid. The quantity of casing fragments collected from the drilling fluid is indicative of the quantity of fragments being generated down hole.
Solids and cuttings are generally removed from drilling fluids at the surface by solids control equipment such as shale shakers and hydrocyclones, which dump solids into collection bins. It is known to place a "ditch magnet" into the drilling fluid system to collect casing fragments from the drilling fluids. The typical ditch magnet is heavy, and requires at least two persons to lower it into the drilling fluid stream.
As metal fragments adhere to the ditch magnet, the device becomes even heavier and difficult DMSLegal\055650\00001 \2212682v t for personnel to remove. Removal of the metal particles from the ditch magnet is difficult because of the strong magnetic field, which can also result in the magnetization of handles or other features of the device. Drilling personnel usually run their hands over the surface of the ditch magnet in an effort to strip the magnetic materials from the magnet. This process is slow and laborious, and the amount of metal fragments retrieved and therefore the accuracy of the calculation of total metal loss in the casing depends on the skill and thoroughness of the personnel removing the fragments from the ditch magnets. Another known method of fragment removal employs shrouded or sheathed magnets in a non-magnetic housing which includes a lid connectable to the housing so that the magnets are removable from the housing.
By removing the magnets from the housing, the housing can be demagnetized to facilitate collection of the metal filings from the exterior surface of the housing.
However, the connection between the lid and the housing can become fouled by drilling mud and metal filings so that the reconnection of the lid to the housing becomes difficult. There is a need for an apparatus and method for inexpensive removal of casing fragments from drilling fluids without the disadvantages of the known devices and methods.
SUMMARY OF THE INVENTION
The present invention is directed to methods and apparatus for removing casing fragments from fluids circulated in hydrocarbon-producing wells which meets the need identified above. In one aspect, the invention is directed to a method for monitoring the condition of well casing by recovering magnetically attractable casing fragments from fluid in a vessel having an upper end, including placing a reusable magnetic separator in the fluid in the vessel, wherein the separator includes a magnetic body, at least one nonmagnetic end contiguous to the body, an exterior surface spanning the body and nonmagnetic end, and a hanger; retaining the separator in the fluid for a selected period of time; removing the separator from the vessel;
and urging the casing fragments along the exterior surface of the separator to the nonmagnetic end DMS Le ga I\055650\00001 \2212682v I
and collecting them. In another aspect, the invention is directed to a magnetic separator, having a bare magnet body, at least one nonmagnetic end contiguous to the body, and an exterior surface spanning the body and nonmagnetic end.
These and other features and aspects of the present invention will become better understood with regard to the following description, appended claims, and accompanying drawings.
BRIEF DESCRIPTION OF THE DRAWINGS
FIG. 1 is a side elevation view of an embodiment of the disclosed invention.
FIG. 2 is an exploded isometric view of an embodiment the disclosed invention.
FIG. 3 shows a side elevation view of an embodiment of the disclosed invention in operation.
DETAILED DESCRIPTION OF THE EMBODIMENTS
Referring to FIG. 1, one apparatus according to the invention is a reusable magnetic separator l0a for retrieving metal fragments from hydrocarbon well fluids including a magnet body 12a contiguous to at least one nonmagnetic end 14a, and an exterior surface 16a.
Referring to FIG. 2, a method of the invention includes placing a reusable magnetic separator lOb into fluid 28 in a vessel 20, such as a shale shaker, and retaining the separator lOb in the fluid 28 for a selected period of time; the magnetic field separates the casing fragments 30 and other magnetically attractable materials from the fluid 28.
After a suitable selected period of time, the separator lOb is removed from the vessel DMS Legal\055650\00001 \2212682v 1 20, and, to release the casing fragments 30 from the separator lOb, the casing fragments 30 are urged along the exterior surface 16b to the nonmagnetic end 14b. In addition, the recovered casing fragments 30 may be analyzed (qualitatively and/or quantitatively) to assess the condition of the well casing. As shown in FIG.
2, in some embodiments, the separator lOb may be suspended in the fluid 28 with one or more hangers 18a.
Another aspect of the invention is a method for monitoring the condition of well casing by recovering magnetically attractable casing fragments from fluid, wherein the casing fragments may be generated by use or modification of the well casing.
In this method, a reusable magnetic separator having a magnetic body and a nonmagnetic end contiguous to the body is placed in such fluid contained in a vessel, whereby magnetically attractable casing fragments are separated from the fluid by the magnetic field created by the magnetic body. After a suitable selected period of time, the separator is removed from the fluid, and the casing fragments are urged along the exterior surface of the separator to the nonmagnetic end. The magnetic separator used in some embodiments may include a housing substantially free of protrusions along its sides and containing bar magnets, at least one nonmagnetic end, an eye bolt on the at least one nonmagnetic end attaching such nonmagnetic end to a hanger (such as a chain or other conventional hanger). In some embodiments, the collected casing fragments may be weighed and the total weight of the recovered casing fragments may calculated. The total weight of the casing originally installed in the well may also be calculated so that the percent of metal lost from the casing is obtainable for example by dividing the total weight of the casing fragments recovered from the well by the total weight of the casing originally installed in the well. The casing fragments may also be subjected to qualitative assessment, such as by visual inspection.
Yet another aspect of the invention is a method for collecting magnetically attractable particles from fluid. This method of the invention includes placing a reusable magnetic separator in fluid, wherein the separator includes a magnetic body which in DMSLegal\055650\00001 \2212682v I
These and other features and aspects of the present invention will become better understood with regard to the following description, appended claims, and accompanying drawings.
BRIEF DESCRIPTION OF THE DRAWINGS
FIG. 1 is a side elevation view of an embodiment of the disclosed invention.
FIG. 2 is an exploded isometric view of an embodiment the disclosed invention.
FIG. 3 shows a side elevation view of an embodiment of the disclosed invention in operation.
DETAILED DESCRIPTION OF THE EMBODIMENTS
Referring to FIG. 1, one apparatus according to the invention is a reusable magnetic separator l0a for retrieving metal fragments from hydrocarbon well fluids including a magnet body 12a contiguous to at least one nonmagnetic end 14a, and an exterior surface 16a.
Referring to FIG. 2, a method of the invention includes placing a reusable magnetic separator lOb into fluid 28 in a vessel 20, such as a shale shaker, and retaining the separator lOb in the fluid 28 for a selected period of time; the magnetic field separates the casing fragments 30 and other magnetically attractable materials from the fluid 28.
After a suitable selected period of time, the separator lOb is removed from the vessel DMS Legal\055650\00001 \2212682v 1 20, and, to release the casing fragments 30 from the separator lOb, the casing fragments 30 are urged along the exterior surface 16b to the nonmagnetic end 14b. In addition, the recovered casing fragments 30 may be analyzed (qualitatively and/or quantitatively) to assess the condition of the well casing. As shown in FIG.
2, in some embodiments, the separator lOb may be suspended in the fluid 28 with one or more hangers 18a.
Another aspect of the invention is a method for monitoring the condition of well casing by recovering magnetically attractable casing fragments from fluid, wherein the casing fragments may be generated by use or modification of the well casing.
In this method, a reusable magnetic separator having a magnetic body and a nonmagnetic end contiguous to the body is placed in such fluid contained in a vessel, whereby magnetically attractable casing fragments are separated from the fluid by the magnetic field created by the magnetic body. After a suitable selected period of time, the separator is removed from the fluid, and the casing fragments are urged along the exterior surface of the separator to the nonmagnetic end. The magnetic separator used in some embodiments may include a housing substantially free of protrusions along its sides and containing bar magnets, at least one nonmagnetic end, an eye bolt on the at least one nonmagnetic end attaching such nonmagnetic end to a hanger (such as a chain or other conventional hanger). In some embodiments, the collected casing fragments may be weighed and the total weight of the recovered casing fragments may calculated. The total weight of the casing originally installed in the well may also be calculated so that the percent of metal lost from the casing is obtainable for example by dividing the total weight of the casing fragments recovered from the well by the total weight of the casing originally installed in the well. The casing fragments may also be subjected to qualitative assessment, such as by visual inspection.
Yet another aspect of the invention is a method for collecting magnetically attractable particles from fluid. This method of the invention includes placing a reusable magnetic separator in fluid, wherein the separator includes a magnetic body which in DMSLegal\055650\00001 \2212682v I
turn may have bare magnet, at least one nonmagnetic end contiguous to the body, and an exterior surface spanning the body and nonmagnetic end; retaining the separator in the fluid for a selected period of time; removing the separator from the fluid; and, urging the particles along the exterior surface of the separator to the nonmagnetic end and collecting them.
In some embodiments of the invention, the separator may include nonmagnetic ends at either side of the magnetic body, such that the magnetically attractable casing fragments may be collected by urging them to either nonmagnetic end. In other embodiments, the separator may be suspended from the upper end of the vessel with a hanger, which may include cable, rope, chain, or other conventional materials.
In yet other embodiments, the separator may be suspended with at least two hangers for increased stability; each of these hangers may be disposed away from the other and furthermore may each be disposed at a nonmagnetic end. In various embodiments of the invention, the length of the hanger may be selected to maintain the separator above the bottom of the vessel. The selected length of the hanger may then be fixed in some embodiments of the inventive methods so that the separator may be positioned within the vessel.
Referring to FIG. 3, in some embodiments of the invention the body 12c may include at least one magnet 22, and each magnet 22 may have a bore 26 such that the bores 26 of adjacent magnets 22 are aligned along an axis and a retainer 24 can be inserted through the bore 26 of each magnet 22. At least one end of the retainer 24 may be attached to a nonmagnetic end 14c, which nonmagnetic end is further attached to a hanger 18.
While the above is a description of various embodiments of the present invention, further modifications may be employed without departing from the spirit and scope of the present invention. For example, the size, shape, and/or material of the various components may be changed as desired. Thus the scope of the invention should not be DMS Le ga I\055650\00001 \2212682v I
In some embodiments of the invention, the separator may include nonmagnetic ends at either side of the magnetic body, such that the magnetically attractable casing fragments may be collected by urging them to either nonmagnetic end. In other embodiments, the separator may be suspended from the upper end of the vessel with a hanger, which may include cable, rope, chain, or other conventional materials.
In yet other embodiments, the separator may be suspended with at least two hangers for increased stability; each of these hangers may be disposed away from the other and furthermore may each be disposed at a nonmagnetic end. In various embodiments of the invention, the length of the hanger may be selected to maintain the separator above the bottom of the vessel. The selected length of the hanger may then be fixed in some embodiments of the inventive methods so that the separator may be positioned within the vessel.
Referring to FIG. 3, in some embodiments of the invention the body 12c may include at least one magnet 22, and each magnet 22 may have a bore 26 such that the bores 26 of adjacent magnets 22 are aligned along an axis and a retainer 24 can be inserted through the bore 26 of each magnet 22. At least one end of the retainer 24 may be attached to a nonmagnetic end 14c, which nonmagnetic end is further attached to a hanger 18.
While the above is a description of various embodiments of the present invention, further modifications may be employed without departing from the spirit and scope of the present invention. For example, the size, shape, and/or material of the various components may be changed as desired. Thus the scope of the invention should not be DMS Le ga I\055650\00001 \2212682v I
limited by the specific structures disclosed. Instead the true scope of the invention should be determined by the following claims.
DM S Le gal\055650\00001 \2212682v 1
DM S Le gal\055650\00001 \2212682v 1
Claims (33)
1. A method for monitoring well casing by recovering magnetically attractable casing fragments from drilling fluid in a vessel having an upper end, comprising:
(a) placing a reusable magnetic separator in the drilling fluid in the vessel, the separator comprising a magnetic body, at least one nonmagnetic end contiguous to the body, and an exterior surface spanning the body and the nonmagnetic end;
(b) retaining the separator in the drilling fluid for a selected period of time;
(c) removing the separator from the vessel;
(d) urging the fragments along the exterior surface of the separator to the nonmagnetic end; and (e) analyzing the casing fragments recovered after urging them to the nonmagnetic end.
(a) placing a reusable magnetic separator in the drilling fluid in the vessel, the separator comprising a magnetic body, at least one nonmagnetic end contiguous to the body, and an exterior surface spanning the body and the nonmagnetic end;
(b) retaining the separator in the drilling fluid for a selected period of time;
(c) removing the separator from the vessel;
(d) urging the fragments along the exterior surface of the separator to the nonmagnetic end; and (e) analyzing the casing fragments recovered after urging them to the nonmagnetic end.
2. The method of claim 1, wherein the vessel is a shale shaker.
3. The method of claim 1, wherein the exterior surface is substantially smooth.
4. The method of claim 1, wherein the body comprises housing and a source of magnetic field within the housing.
5. The method of claim 1, wherein the nonmagnetic end is nonmagnetizable by the magnetic body.
6. The method of claim 1, further comprising connecting the separator to at least one hanger and suspending the separator within the vessel using the hanger.
7. The method of claim 6, wherein the hanger is connected to the upper end of the vessel by the hanger.
8. The method of claim 6, further comprising selecting the length of the hanger.
9. The method of claim 8, further comprising fixing the length of the hanger.
10. The method of claim 8, further comprising selecting the length of the hanger to suspend the separator away from the bottom of the vessel.
11. The method of claim 10, further comprising fixing the length of the hanger.
12. A method for monitoring the condition of well casing by recovering magnetic casing fragments generated during use or modification of the casing from fluid in a vessel having an upper end, comprising:
(a) hanging a reusable magnetic separator in the fluid in the vessel, the separator comprising a magnetic body, at least one nonmagnetic end contiguous to the body, an exterior surface spanning the source and nonmagnetic end, and a hanger;
(b) retaining the separator in the fluid for a selected period of time;
(c) removing the separator from the vessel;
(d) urging the casing fragments along the exterior surface of the separator to the nonmagnetic end and collecting them; and, (e) analyzing the collected casing fragments.
(a) hanging a reusable magnetic separator in the fluid in the vessel, the separator comprising a magnetic body, at least one nonmagnetic end contiguous to the body, an exterior surface spanning the source and nonmagnetic end, and a hanger;
(b) retaining the separator in the fluid for a selected period of time;
(c) removing the separator from the vessel;
(d) urging the casing fragments along the exterior surface of the separator to the nonmagnetic end and collecting them; and, (e) analyzing the collected casing fragments.
13. A method for monitoring well casing comprising:
(a) providing a vessel having drilling fluid circulating therethrough, the drilling fluid entering the vessel including that returning from a well;
(b) placing a magnetic separator in the drilling fluid in the vessel, the magnetic separator comprising a magnetic body and an exterior surface and placing includes connecting the separator to at least one hanger and suspending the separator within the vessel using the at least one hanger;
(c) retaining the magnetic separator in the drilling fluid for a first selected period of time such that fragments from the drilling fluid become magnetically attached to the magnetic separator;
(d) removing the magnetic separator from the vessel and removing the fragments from the exterior surface;
(e) replacing the magnetic separator in the drilling fluid in the vessel;
(f) retaining the magnetic separator in the drilling fluid for a second selected period of time having a duration similar to the first selected period of time such that a. second amount of fragments from the drilling fluid become magnetically attached to the magnetic separator;
(g) removing the magnetic separator from the vessel and removing the second amount of fragments from the exterior surface; and (h) comparing the fragments with the second amount of fragments to assess the well casing comparatively between the first period of time and the second period of time.
(a) providing a vessel having drilling fluid circulating therethrough, the drilling fluid entering the vessel including that returning from a well;
(b) placing a magnetic separator in the drilling fluid in the vessel, the magnetic separator comprising a magnetic body and an exterior surface and placing includes connecting the separator to at least one hanger and suspending the separator within the vessel using the at least one hanger;
(c) retaining the magnetic separator in the drilling fluid for a first selected period of time such that fragments from the drilling fluid become magnetically attached to the magnetic separator;
(d) removing the magnetic separator from the vessel and removing the fragments from the exterior surface;
(e) replacing the magnetic separator in the drilling fluid in the vessel;
(f) retaining the magnetic separator in the drilling fluid for a second selected period of time having a duration similar to the first selected period of time such that a. second amount of fragments from the drilling fluid become magnetically attached to the magnetic separator;
(g) removing the magnetic separator from the vessel and removing the second amount of fragments from the exterior surface; and (h) comparing the fragments with the second amount of fragments to assess the well casing comparatively between the first period of time and the second period of time.
14. The method of claim 13, wherein comparing includes weighing the fragments and weighing the second amount of fragments and comparing their weights.
15. The method of claim 13, wherein during placing, the magnetic separator is positioned in a position within the vessel and during replacing, the magnetic separator is positioned in substantially the same position within the vessel.
16. The method of claim 13, wherein suspending the magnetic separator includes suspending the magnetic separator in the vessel spaced above a bottom of the vessel.
17. The method of claim 13, wherein the at least one hanger is connected to an upper end of the vessel by the at least one hanger.
18. The method of claim 13, further comprising fixing the length of the at least one hanger.
19. The method of claim 13, wherein the vessel is a shale shaker.
20. The method of claim 13, further comprising analyzing the fragments after removing them.
21. The method of claim 13, further comprising selecting the length of the at least one hanger to suspend the separator away from a bottom of the vessel.
22. The method of claim 21, further comprising fixing the length of the hanger.
23. A method for monitoring well casing comprising:
(a) providing a vessel having drilling fluid circulating therethrough, the drilling fluid entering the vessel including that returning from a well;
(b) providing a magnetic separator including a magnetic body and an exterior surface;
(c) providing at least one hanger connected to the magnetic separator;
(d) placing the magnetic separator in the drilling fluid in the vessel, including connecting the at least one hanger to a support and hanging the magnetic separator on the at least one hanger to place the magnetic separator within the vessel;
(e) retaining the magnetic separator in the drilling fluid for a period of time such that fragments from the drilling fluid become magnetically attached to the magnetic separator;
(f) removing the magnetic separator from the vessel;
(g) collecting magnetically attracted fragments from the magnetic separator; and (h) analyzing the magnetically attracted fragments to assess casing condition.
(a) providing a vessel having drilling fluid circulating therethrough, the drilling fluid entering the vessel including that returning from a well;
(b) providing a magnetic separator including a magnetic body and an exterior surface;
(c) providing at least one hanger connected to the magnetic separator;
(d) placing the magnetic separator in the drilling fluid in the vessel, including connecting the at least one hanger to a support and hanging the magnetic separator on the at least one hanger to place the magnetic separator within the vessel;
(e) retaining the magnetic separator in the drilling fluid for a period of time such that fragments from the drilling fluid become magnetically attached to the magnetic separator;
(f) removing the magnetic separator from the vessel;
(g) collecting magnetically attracted fragments from the magnetic separator; and (h) analyzing the magnetically attracted fragments to assess casing condition.
24. The method of claim 23, wherein hanging the magnetic separator includes suspending the magnetic separator in the vessel spaced above a bottom of the vessel.
25. The method of claim 23, wherein the support is an upper end of the vessel.
26. The method of claim 23, further comprising fixing the length of the at least one hanger and, after urging, replacing the magnetic separator hung in the drilling fluid within the vessel, such that replacing the magnetic separator positions the magnetic separator at a similar location within the vessel each time it is replaced.
27. The method of claim 23, further comprising selecting the length of the at least one hanger to suspend the separator away from a bottom of the vessel.
28. The method of claim 27, further comprising fixing the length of the at least one hanger.
29. The method of claim 23 wherein the at least one hanger includes any of a rope, a cable or a chain.
30. The method of claim 23 wherein there are at least two hangers and hanging includes suspending the magnetic separator between the two hangers.
31. The method of claim 23 wherein the magnetic separator includes a non-magnetic end and the at least one hanger is connected to the non-magnetic end.
32. The method of claim 23, wherein the vessel is a shale shaker.
33. A method for monitoring well casing comprising:
(a) providing a vessel having drilling fluid circulating therethrough, the drilling fluid entering the vessel including that returning from a well;
(b) placing a magnetic separator in the drilling fluid in the vessel, the magnetic separator comprising a magnetic body and an exterior surface and placing includes suspending the magnetic separator in the vessel spaced above a bottom of the vessel;
(c) retaining the magnetic separator in the drilling fluid for a first selected period of time such that fragments from the drilling fluid become magnetically attached to the magnetic separator, (d) removing the magnetic separator from the vessel and removing the fragments from the exterior surface;
(e) replacing the magnetic separator in the drilling fluid in the vessel;
(f) retaining the magnetic separator in the drilling fluid for a second selected period of time having a duration similar to the first selected period of time such that a second amount of fragments from the drilling fluid become magnetically attached to the magnetic separator;
(g) removing the magnetic separator from the vessel and removing the second amount of fragments from the exterior surface; and (h) comparing the fragments with the second amount of fragments to assess the well casing comparatively between the first period of time and the second period of time.
(a) providing a vessel having drilling fluid circulating therethrough, the drilling fluid entering the vessel including that returning from a well;
(b) placing a magnetic separator in the drilling fluid in the vessel, the magnetic separator comprising a magnetic body and an exterior surface and placing includes suspending the magnetic separator in the vessel spaced above a bottom of the vessel;
(c) retaining the magnetic separator in the drilling fluid for a first selected period of time such that fragments from the drilling fluid become magnetically attached to the magnetic separator, (d) removing the magnetic separator from the vessel and removing the fragments from the exterior surface;
(e) replacing the magnetic separator in the drilling fluid in the vessel;
(f) retaining the magnetic separator in the drilling fluid for a second selected period of time having a duration similar to the first selected period of time such that a second amount of fragments from the drilling fluid become magnetically attached to the magnetic separator;
(g) removing the magnetic separator from the vessel and removing the second amount of fragments from the exterior surface; and (h) comparing the fragments with the second amount of fragments to assess the well casing comparatively between the first period of time and the second period of time.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US59698305P | 2005-11-02 | 2005-11-02 | |
| US60/596,983 | 2005-11-02 |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CA2528467A1 CA2528467A1 (en) | 2007-05-02 |
| CA2528467C true CA2528467C (en) | 2012-01-17 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA 2528467 Expired - Fee Related CA2528467C (en) | 2005-11-02 | 2005-11-30 | Magnetic separation in fluids |
Country Status (1)
| Country | Link |
|---|---|
| CA (1) | CA2528467C (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2010112050A1 (en) | 2009-04-03 | 2010-10-07 | Statoil Asa | Equipment and method for reinforcing a borehole of a well while drilling |
| CN112593921A (en) * | 2020-12-15 | 2021-04-02 | 安徽理工大学 | Method for simulating change of shale gas mining through fault casing |
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2005
- 2005-11-30 CA CA 2528467 patent/CA2528467C/en not_active Expired - Fee Related
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| Publication number | Publication date |
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| CA2528467A1 (en) | 2007-05-02 |
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| Date | Code | Title | Description |
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| EEER | Examination request | ||
| MKLA | Lapsed |
Effective date: 20161130 |