Removal and collection of wellbore scale and debris

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;
• circulating fluid, by a jet nozzle of the guide, through the wellbore, thereby facilitating travel of the apparatus through the tubular;
• 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 a collection volume of the apparatus the scale that has been removed from the wall of the tubular, wherein the collection volume is cooperatively defined by a slotted chamber of the scale collector that is coupled to a pipe of the circulating plate assembly.

A system comprising:

• a coiled tubing;
• a thru-tubing motor coupled to the coiled tubing;
• and
• an apparatus coupled to the thru-tubing motor and disposed within a wellbore, the apparatus comprising:
• a scale removal head coupled to the thru-tubing motor, wherein the thru-tubing motor is configured to rotate the apparatus, the scale removal head comprising a first plurality of blades distributed around and extending radially outward from a surface of the scale removal head, each blade of the first plurality of blades comprising a plurality of first inserts disposed on a surface of the respective blade, wherein the first plurality of blades and their respective pluralities of first inserts are cooperatively configured to scrape against a wall of the wellbore to remove scale from the wall of the wellbore as the apparatus rotates;
• a scale collector coupled to the scale removal head opposite of the thru-tubing motor, the scale collector comprising a surrounding slotted chamber, the scale collector defining a first inner region within the surrounding slotted chamber;
• a circulating plate assembly coupled to the scale collector opposite of the scale removal head, the circulating plate assembly comprising a pipe comprising an open end and a perforated end opposite the open end, the circulating plate assembly defining a second inner region within the pipe, wherein the first inner region and the second inner region together define a collection volume for accumulating and storing scale that has been removed from the wall of the wellbore;
• and
• a guide coupled to the circulating plate assembly opposite of the scale collector, the guide comprising a second plurality of blades distributed around and extending radially outward from a surface of the guide, each blade of the second plurality of blades comprising a plurality of second inserts disposed on a surface of the respective blade, wherein the second plurality of blades and their respective pluralities of second inserts are cooperatively configured to scrape against the wall of the wellbore to remove scale from the wall of the wellbore as the apparatus rotates.