IPC분류정보
국가/구분 |
United States(US) Patent
등록
|
국제특허분류(IPC7판) |
|
출원번호 |
UP-0914201
(2006-05-11)
|
등록번호 |
US-7735547
(2010-07-05)
|
우선권정보 |
GB-0509715.9(2005-05-12) |
국제출원번호 |
PCT/GB2006/001733
(2006-05-11)
|
§371/§102 date |
20080416
(20080416)
|
국제공개번호 |
WO06/120453
(2006-11-16)
|
발명자
/ 주소 |
|
출원인 / 주소 |
- Specialised Petroleum Services Group Limited
|
대리인 / 주소 |
|
인용정보 |
피인용 횟수 :
3 인용 특허 :
0 |
초록
▼
There is disclosed a cleaning tool for use in cleaning ferrous material from a wellbore, a cleaning assembly comprising a plurality of such wellbore cleaning tools, and a method of cleaning ferrous materials from a wellbore. In one embodiment, a cleaning tool (12) is disclosed which comprises a tool
There is disclosed a cleaning tool for use in cleaning ferrous material from a wellbore, a cleaning assembly comprising a plurality of such wellbore cleaning tools, and a method of cleaning ferrous materials from a wellbore. In one embodiment, a cleaning tool (12) is disclosed which comprises a tool main body (19) and a number of magnets (20) mounted for selective movement relative to the main body between deactivated and activated positions. When in the activated positions, the magnets serve for attracting ferrous material present in a wellbore (10), to collect such material during passage of the tool along the wellbore, so that the ferrous material may be returned to surface to thereby clean the wellbore.
대표청구항
▼
The invention claimed is: 1. A cleaning tool for use in cleaning ferrous material from a wellbore, the cleaning tool comprising: a tool main body; and at least one magnet mounted for selective movement relative to the main body between a deactivated position and an activated position, wherein the t
The invention claimed is: 1. A cleaning tool for use in cleaning ferrous material from a wellbore, the cleaning tool comprising: a tool main body; and at least one magnet mounted for selective movement relative to the main body between a deactivated position and an activated position, wherein the tool main body comprises at least one passage in a wall thereof, and wherein the at least one magnet is adapted for movement relative to the passage between the deactivated and activated positions. 2. The cleaning tool as claimed in claim 1, wherein the deactivated position of the at least one magnet is a retracted position and the activated position is an extended position. 3. The cleaning tool as claimed in claim 1, wherein the at least one magnet is adapted to be selectively restrained in the deactivated position. 4. The cleaning tool as claimed in claim 1, wherein the at least one magnet is adapted to be held in the deactivated position until it is desired to commence a cleaning operation. 5. The cleaning tool as claimed in claim 1, wherein the at least one passage extends in a substantially radial direction, relative to the tool main body. 6. The cleaning tool as claimed in claim 1, wherein the at least one magnet is located within the passage when in the deactivated position. 7. The cleaning tool as claimed in claim 1, wherein the at least one magnet is located outside the passage when in the deactivated position, and is adapted to be moved into and along the passage during travel from the deactivated position to the activated position. 8. The cleaning tool as claimed in claim 1, wherein an interior of the tool is at least partially filled with a lubricant fluid. 9. The cleaning tool as claimed in claim 8, wherein the at least one passage contains lubricant fluid. 10. The cleaning tool as claimed in claim 1, wherein the cleaning tool comprises a locking mechanism for selectively restraining the at least one magnet in the deactivated position. 11. The cleaning tool as claimed in claim 1, wherein in the deactivated position, the at least one magnet is located radially inwardly relative to the tool main body, and in the activated position, radially outwardly relative to the tool main body. 12. The cleaning tool as claimed in claim 1, wherein in the activated position, the at least one magnet resides within the circumference of the tool main body. 13. The cleaning tool as claimed in claim 1, wherein in the activated position, the at least one magnet protrudes from an outer surface of the main body. 14. A cleaning tool for use in cleaning ferrous material from a wellbore, the cleaning tool comprising: a tool main body; and at least one magnet mounted for selective movement relative to the main body between a deactivated position and an activated position, wherein the tool comprises a pressure equalization valve for facilitating pressure equalization between an exterior and an interior of the tool. 15. The cleaning tool as claimed in claim 14, wherein the valve is a breather valve comprising an opening for permitting fluid communication between the exterior and the interior of the tool. 16. The cleaning tool as claimed in claim 14, wherein the valve is adapted to restrict entry of solid particles into the tool interior, whilst permitting fluid communication. 17. A cleaning tool for use in cleaning ferrous material from a wellbore, the cleaning tool comprising: a tool main body; and at least one magnet mounted for selective movement relative to the main body between a deactivated position and an activated position, wherein the magnet is biased towards the activated position. 18. The cleaning tool as claimed in claim 17, wherein the tool comprises a mechanical biasing assembly for biasing the magnet towards the activated position. 19. The cleaning tool as claimed in claim 17, wherein the tool comprises at least one main magnet for cleaning ferrous material from the wellbore and a corresponding at least one biasing magnet associated with the main magnet, for selectively urging the main magnet towards the activated position. 20. The cleaning tool as claimed in claim 19, wherein the at least one biasing magnet is adapted to be located in a position in common pole-to-pole opposition with the main magnet, to exert a magnetic repulsion force on the main magnet, thereby urging the main magnet towards the activated position. 21. A cleaning tool for use in cleaning ferrous material from a wellbore, the cleaning tool comprising: a tool main body; at least one magnet mounted for selective movement relative to the main body between a deactivated position and an activated position; and an inner mandrel mounted for movement relative to the main body, wherein movement of the mandrel serves for moving the at least one magnet between the deactivated and activated positions. 22. The cleaning tool as claimed in claim 21, wherein the inner mandrel is movable between a first position where the at least one magnet is in the deactivated position, and a further position where the at least one magnet is permitted to move to the activated position. 23. The cleaning tool as claimed in claim 22, wherein the inner mandrel is selectively restrained in the first position to thereby selectively restrain the at least one magnet in the deactivated position. 24. The cleaning tool as claimed in claims 22, wherein the at least one magnet is coupled to the inner mandrel such that movement of the mandrel between the first and the further position carries the magnet therewith. 25. The cleaning tool as claimed in claim 24, wherein the tool main body comprises at least one passage in a wall thereof, the at least one magnet being adapted for movement relative to the passage between the deactivated and activated positions, and wherein the mandrel is movable from the first position, where the magnet is misaligned with the passage, and the further position, where the magnet is aligned with the passage. 26. The cleaning tool as claimed in claim 21, wherein the tool includes a key assembly including a track formed in one of the mandrel and the main body and a key formed in the other one of the mandrel and the main body, the key assembly permitting axial movement of the mandrel relative to the main body but preventing relative rotation. 27. The cleaning tool as claimed in claim 21, wherein the at least one magnet is mounted in the tool main body and held in the deactivated position by magnetic attraction with the inner mandrel. 28. A cleaning tool as claimed in claim 27, wherein the tool comprises at least one main magnet for cleaning ferrous material from the wellbore and a corresponding at least one biasing magnet associated with the main magnet, for selectively urging the main magnet towards the activated position, and wherein following movement of the inner mandrel from the first to the further position, the at least one main magnet is urged towards the activated position by the at least one biasing magnet. 29. The cleaning tool as claimed in claim 21, wherein the tool comprises a ball seat formed in a central bore of the tool, the ball seat defining an upset extending into the central bore and adapted to receive a ball valve for movement of the at least one magnet to the activated position. 30. The cleaning tool as claimed in claim 29, wherein the ball seat is formed on the inner mandrel. 31. A cleaning tool for use in cleaning ferrous material from a wellbore, the cleaning tool comprising: a tool main body; at least one magnet mounted for selective movement relative to the main body between a deactivated position and an activated position, wherein the tool comprises at least one set of magnets, the set comprising a plurality of magnets spaced around a circumference of the tool main body, and a magnetic sub which houses the magnets, wherein the magnetic sub is located axially between upper and lower stabilizers on the tool body, an outer diameter of the sub being less than the maximum outer diameter of the stabilizers, to define an annulus in which ferrous material is collected and stored during passage of the tool through the wellbore. 32. The cleaning tool as claimed in claim 31, wherein the tool comprises a plurality of such sets of magnets, the sets relatively spaced in a direction along an axial length of the tool main body. 33. The cleaning tool as claimed in claim 31, wherein the tool comprises a plurality of magnetic subs each housing respective magnets, and wherein the magnetic subs are mounted around a common inner mandrel for urging the magnets towards their activated positions. 34. An assembly for use in cleaning ferrous material from a wellbore, the assembly comprising a plurality of cleaning tools coupled together, each cleaning tool comprising a tool main body and at least one magnet mounted for selective movement relative to the main body between a deactivated position and an activated position, wherein the cleaning tools are adapted to be sequentially activated. 35. The assembly as claimed in claim 34, wherein the cleaning tools are adapted to be sequentially activated by landing a ball on a ball seat of a first tool to activate the first tool, and then blowing the ball through the first tool into a further tool, to activate the further tool. 36. The assembly as claimed in claim 34, wherein the tools are coupled together end-to-end and adapted to be simultaneously activated. 37. A method of cleaning ferrous material from a wellbore, the method comprising the steps of: running a cleaning tool into a wellbore to be cleaned with a magnet of the cleaning tool in a deactivated position; moving the magnet from the deactivated position to an activated position; and translating the cleaning tool relative to the wellbore to collect ferrous material present in the wellbore.
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