Slickline conveyed tubular scraper system
View Patent ↗A downhole tubular scraper is run in on slickline with an on board power supply. It features counter-rotating scrapers without an anchor in one embodiment or an anchor with single rotating scrapers. The scraper is selectively operated to conserve power in the power supply. A drive system uses a single driver to obtain counter-rotating motion in the scrapers.
1. A scraper assembly for downhole use, comprising:
a housing and a slickline to suspend said housing downhole;
a power supply;
a scraper assembly comprising at least one scraper that rotates when driven by a motor supported by said housing and powered by said power supply.
2. The assembly of claim 1 , further comprising:
a selectively actuated anchor device to resist torque generated by said scraper assembly.
3. The assembly of claim 2 , wherein:
said anchor device comprises at least one bow spring.
4. The assembly of claim 1 , wherein:
said scraper comprises a plurality of radially extending members with a hard material disposed at an outer end thereof.
5. A scraper assembly for downhole use, comprising:
a housing and a slickline to suspend said housing downhole;
a power supply;
a rotating scraper assembly driven by a motor supported by said housing and powered by said power supply;
said scraper assembly further comprises subassemblies rotated by said motor simultaneously in opposed directions.
6. The assembly of claim 5 , wherein:
said housing is not anchored downhole against torque.
7. The assembly of claim 5 , further comprising:
said motor directly drives one said subassembly from a shaft and another said subassembly in the opposite direction using a gear system powered from said shaft.