Remotely activated multi-cycle wellbore cleaning tool
A downhole tool for cleaning a wellbore, the tool including a tool body having a flowpath therethrough. A liquid is configured to flow through the flowpath and may have an intermittent flow pattern. An inner sleeve positioned within the tool body includes a recess having a recess pattern. In response to the intermittent flow pattern, a shift pin positioned in the recess of the inner sleeve traverses through the recess pattern. The downhole tool includes at least one scraper blade. The scraper blade is movable between a retracted position and a radially expanded position. In response to the shift pin traversing the recess pattern of the recess, the scraper blade can be expanded radially outward toward a wall of the wellbore from the retracted position to the expanded position and/or retracted inward away from the wall of the wellbore from the expanded position to the retracted position.
1 . A system comprising:
a workstring to be deployed in a wellbore, the workstring having a cleaning tool that comprises,
a tool body having an upper inner mandrel, a scraper body, a bypass opening and a flow path for a flow of liquid through the tool body;
at least one scraper blade positioned on the scraper body;
a first magnet disposed on a first surface of the cleaning tool; and
a second magnet disposed on a second surface of the cleaning tool, wherein the at least one scraper blade is configured to move from a retracted position to a radially expanded position outward to a wall of the wellbore based on movement of the first magnet relative to the second magnet,
wherein the upper inner mandrel includes an internal bypass positioned uphole of the scraper body, wherein the bypass opening and the internal bypass align when the at least one scraper blade is in the radially expanded position, enabling fluid flow between the wellbore annulus and the flow path uphole of the at least one scraper blade.
2 . The system of claim 1 ,
wherein the first magnet is disposed on a surface of the at least one scraper blade and the second magnet is disposed on a surface of the upper inner mandrel.
3 . The system of claim 2 , wherein the cleaning tool further comprises an inner sleeve movable between a first position and a second position,
wherein, in the first position, the first magnet and the second magnet are offset, and
wherein, in the second position, the first magnet and the second magnet are substantially aligned.
4 . The system of claim 3 , wherein the at least one scraper blade is configured to retract in response to the first magnet and the second magnet being offset.
5 . The system of claim 4 , wherein the at least one scraper blade is configured to deploy outward to the radially expanded position, in response to the first magnet and the second magnet being substantially aligned.
6 . The system of claim 5 , further comprising:
a shift pin, the shift pin extending at least partially into a recess pattern disposed on a surface of the inner sleeve, wherein the inner sleeve movements between the first position and the second position are limited by movement of the shift pin within the recess.
7 . The system of claim 6 , wherein the shift pin is movable through the recess pattern based on a flow of a liquid through the flow path.
8 . The system of claim 6 , wherein the shift pin is movable through the recess pattern based on an intermittent flow of a liquid through the flow path, the intermittent flow based on the recess pattern.
9 . A method comprising:
deploying a workstring into a wellbore, the workstring including a cleaning tool disposed thereon, the cleaning tool comprising:
a tool body having an upper inner mandrel, a scraper body, a bypass opening and a flow path for a flow of liquid through the tool body;
at least one scraper blade positioned on the scraper body;
a first magnet disposed on a first surface of the cleaning tool; and
a second magnet disposed on a second surface of the cleaning tool, wherein the at least one scraper blade is deployed in a retracted position and configured to move from the retracted position to a radially expanded position outward to a wall of the wellbore based on movement of the first magnet relative to the second magnet,
wherein the upper inner mandrel includes an internal bypass positioned uphole of the scraper body, wherein the bypass opening and the internal bypass align when the at least one scraper blade is in the radially expanded position, enabling fluid flow between the wellbore annulus and the flow path uphole of the at least one scraper blade;
positioning the cleaning tool at a cleaning depth; and
in response to the workstring being positioned at a cleaning depth,
controlling a flow of liquid through the flow path; and
moving the at least one scraper blade from the retracted position to a radially expanded position in response to controlling the flow of liquid through the flow path of the cleaning tool.
10 . The method of claim 9 , wherein the flow of liquid through the flow path has an intermittent flow pattern.
11 . The method of claim 9 , wherein the cleaning tool further includes a shift pin and an inner sleeve positioned in the tool body of the cleaning tool, the inner sleeve having a recess that includes a recess pattern into which the shift pin is positioned, and
wherein moving the at least one scraper blade from the retracted position to the radially expanded position outward toward the wall of the wellbore comprises moving the at least one scraper blade from the retracted position to the radially expanded position outward toward the wall of the wellbore in response to the shift pin moving through the recess pattern based an intermittent flow pattern of liquid through the flow path.
12 . The method of claim 9 ,
wherein the first magnet is disposed on a surface of the at least one scraper blade,
wherein the second magnet is disposed on a surface of the upper inner mandrel, and
wherein moving the at least one scraper blade from the retracted position to the radially expanded position outward toward the wall of the wellbore comprises moving the upper inner mandrel axially relative to the at least one scraper blade.
13 . The method of claim 12 , wherein moving the at least one scraper blade from the retracted position to the radially expanded position outward toward the wall of the wellbore comprises substantially aligning the first magnet with the second magnet.
14 . The method of claim 13 , further comprising:
moving the at least one scraper blade from the radially expanded position back to the retracted position, after cleaning at least a portion of the wellbore and while the workstring is positioned in the wellbore.
15 . The method of claim 14 , wherein moving the at least one scraper blade from the radially expanded position back to the retracted position comprises moving the first magnet and the second magnet substantially offset to each other.