| CPC E21B 37/02 (2013.01) [E21B 27/00 (2013.01)] | 20 Claims |
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9. A method comprising:
rotating an apparatus disposed within a tubular installed in a wellbore, wherein the apparatus comprises a scale removal head, a scale collector, a circulating plate assembly, and a guide, wherein the scale collector comprises a surrounding slotted chamber and defines a first inner region, wherein the circulating plate assembly comprises a pipe comprising an open end and a perforated end opposite the open end, wherein the circulating plate assembly defines a second inner region, wherein the first inner region and the second inner region together define a collection volume, wherein the perforated end defines a plurality of perforations;
circulating fluid, by a jet nozzle of the guide, through the wellbore, thereby facilitating travel of the apparatus through the tubular;
allowing, by the perforations of the circulating plate assembly, the fluid to flow through pipe of the circulating plate assembly as the apparatus is rotated;
in response to rotating the apparatus and circulating fluid, centralizing the apparatus within the tubular;
in response to rotating the apparatus, scraping against a wall of the tubular with a first plurality of blades of the scale removal head to remove scale from the wall of the tubular, wherein the first plurality of blades are distributed around and extend radially outward from a surface of the scale removal head;
in response to rotating the apparatus, scraping against the wall of the tubular with a second plurality of blades of the guide to remove scale from the wall of the tubular, wherein the second plurality of blades are distributed around and extend radially outward from a surface of the guide; and
collecting within the collection volume of the apparatus the scale that has been removed from the wall of the tubular.
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