Principle of operation:
The tool is put in working position by means of fluid injected inside the tool through coil tubing. This leads to 90-degree turning of lower part of the tool. The tool turning initiates at circulation pressure above 6 MPa. At the same time the axial travel of the plunger inside the cylinder takes place, that is converted into tool rotary movement by tool's turning section.
The turning section design restricts the turning angle to 90 degrees. When the flow in the tool decreases and the pressure drops the plunger returns back into its initial position. To make another 90-degree turn the flow and pressure need to be increased once again. This process can be repeated as many times as required.