Magnetic well cleaning apparatus
AssigneeSPS-AFOS International Limited
InventorsMark Carmichael, Paul Howlett
Life of this patent
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Abstract
Apparatus which can collect loose debris, particularly ferrous debris, has a body 2 with upper 3 and lower 4 stabiliser sleeve. The body 2 has a one or more integral magnets or magnetic areas 5. In one embodiment the magnets are located in a first and second row on a split sleeve 6 and are covered by a protective stainless steel sleeve7. The apparatus may alternatively comprise magnetic scraper blades or a magnetic sub. The magnets are selectively activated. There is also described a method of trapping or retaining debris in a well bore.
Claims11
Apparatus for collecting loose debris or particles in a well casing or liner, the apparatus comprising a body for attachment to a work string, the body including an upper and lower stabiliser, one or more magnets supported between the stabilisers and a protective sleeve positioned over the magnets, wherein the protective sleeve is free to rotate relative to the stabilisers.
A method of collecting loose debris or particles in a well casing or liner, the method comprising the steps of:
- (a) attaching to a work string, apparatus comprising a body including an upper and lower stabiliser, one or more magnets supported between the stabilisers and a protective sleeve positioned over the magnets which is free to rotate relative to the stabilisers;
- (b) running the apparatus into the well casing or liner;
- (c) attracting and retaining said debris and particles on the protective sleeve;
- and
- (d) removing the apparatus from the well casing or liner in order to remove the debris and particles.
Dependencies are inferred from the claim text.