초록 ▼

The invention is a system for retrieving loose metallic debris, such as stray radioactive marker bullets, from a borehole in a subterranean formation. The system can be used to retrieve stray radioactive marker bullets during placement of the radioactive marker bullets in the subterranean formation.

The invention is a system for retrieving loose metallic debris, such as stray radioactive marker bullets, from a borehole in a subterranean formation. The system can be used to retrieve stray radioactive marker bullets during placement of the radioactive marker bullets in the subterranean formation. The system utilizes a downhole fishing tool having at least one recessed magnetic surface for attracting and holding stray radioactive marker bullets. The recessed magnetic surface allows the fishing tool to be removed from the borehole without scraping off retrieved marker bullets that are held against the magnetic surface.

대표청구항 ▼

The invention is a system for retrieving loose metallic debris, such as stray radioactive marker bullets, from a borehole in a subterranean formation. The system can be used to retrieve stray radioactive marker bullets during placement of the radioactive marker bullets in the subterranean formation.

The invention is a system for retrieving loose metallic debris, such as stray radioactive marker bullets, from a borehole in a subterranean formation. The system can be used to retrieve stray radioactive marker bullets during placement of the radioactive marker bullets in the subterranean formation. The system utilizes a downhole fishing tool having at least one recessed magnetic surface for attracting and holding stray radioactive marker bullets. The recessed magnetic surface allows the fishing tool to be removed from the borehole without scraping off retrieved marker bullets that are held against the magnetic surface. rface and said recovery opening surface, wherein a flow rate of the treatment liquid flowing from said introduction opening surface to said recovery opening surface via the surface to be treated of the workpiece is controlled to 0.02 to 0.3 L/min per 1 cm in the long side direction of said introduction opening surface. 2. A wet treatment apparatus according to claim 1, wherein the flow rate is controlled by regulating the sectional area of said introduction flow path or said recovery flow path. 3. A wet treatment apparatus according to claim 1, wherein the long sides of said introduction opening surface and said recovery opening surface have lengths that are equal to or larger than a width of the workpiece said width being in a direction parallel to the long sides. 4. A wet treatment apparatus according to claim 1, wherein a relative moving speed due to said moving mechanism is 0.5 to 20 cm/sec. 5. A wet treatment apparatus according to claim 1, wherein the distance between said introduction opening surface and said recovery opening surface, and the surface to be treated of the workpiece is 0.5 to 6 mm. 6. A wet treatment apparatus according to claim 1, wherein the short sides of said introduction opening surface and said recovery opening surface each have a length of 0.01 to 2 cm. 7. A wet treatment apparatus according to claim 1, wherein an ultrasonic oscillation mechanism is interposed between said introduction opening surface and said recovery opening surface to apply ultrasonic oscillation to the treatment liquid on the workpiece. 8. A wet treatment apparatus according to claim 1, further comprising an oxidation-reduction potential control means for controlling the treatment liquid. 9. A wet treatment apparatus according to claim 1, further comprising a pH control means for controlling the treatment liquid. lar rib. 13. The case according to claim 1, wherein the lid, when in a closed position, presses via the periphery of said lid against the flexible lip. 14. The case according to claim 1, wherein said seal comprises a peripheral part which in cross section has undulations and is in contact via a lower ridge against the case body. 15. The case according to claim 1, wherein said seal defines two annular grooves facing towards the case body, said annular grooves lying one on each side of a central groove facing towards the lid when the case is closed, and wherein said seal comprises further, at the bottom of the grooves that face towards the case body, rests molded integrally with said seal, said rests resting against the case body. 16. The case according to claim 15, wherein said lid comprises an annular rib which engages in said central groove when the case is closed. 17. The case according to claim 1, wherein said seal comprises a peripheral part which in cross section has a shape which overall is concave towards the case body, and wherein at least one stiffening element is provided inside the concave shape of the peripheral part. 18. The case according to claim 17, wherein said seal comprises a plurality of stiffening elements extending radially and molded integrally with the seal. 19. The case according to claim 18, wherein said seal comprises a stiffening element in the form of a continuous annular rib extending over the entire height of the peripheral part. 20. A case according to claim 17, wherein said seal comprises a stiffening element in the form of a discontinuous annular rib extending over the entire height of the peripheral part. 21. A case according to claim 1, wherein either the lid or the case body comprises at least one kidney bean slot and wherein either the case body or the lid, respectively, comprises a hinge pin engaged in the kikney bean slot, the arrangement of the kidney bean slot and of the hinge pin being such that when the lid is closed, the hinge pin can move in the kidney bean slot so that the lid pressses substantially uniformly against the seal. 22. A case comprising a lid and a case body provided with a housing for accommodating a reserve of substance contained in a cup, wherein said cup is extended by a seal, wherein at least a part of said seal, in an open position of said case, is separated from the case body by a free space, said free space extending both on an inner side and on an outer side of a portion of the case body which, at least when the case is in a closed position, is in contact with said seal, wherein an annular surface is formed on a ring secured to said seal to serve for the attachment of at least either one of a removable closure sheet and a mesh. 23. The case according to claim 22, wherein said case body is provided with a traversing aperture. 24. The case according to claim 22, wherein said seal is pressing in a sealed manner against said case body. 25. The case according to claim 22, wherein said seal has a skirt held by friction by a wall of a housing of said case body accommodating said cup. 26. The case according to claim 22, wherein said seal is overmolded onto said ring. 27. The case according to claim 22, wherein said lid presses in a sealed manner onto said seal when said lid is in a closed position. 28. The case according to claim 22, wherein said seal comprises a flexible lip. 29. The case according to claim 28, wherein said seal comprises at the base of said flexible lip a heel which contacts in a sealed manner said case body. 30. The case according to claim 28, wherein said flexible lip presses in a sealed manner against said case body. 31. The case according to claim 28, wherein said flexible lip presses in a sealed manner against the case body at the periphery of said flexible lip, even when the case is open. 32. The case according to claim 28, wherein said flexible lip is in contact with a rib projecting from said case body. 33. The case according to claim 32, wh