A downhole tool is arranged for connection to a fluid-carrying string. The downhole tool includes: a first reversibly expandable sealing element; a second reversibly expandable sealing element placed at an axial distance from the first reversibly expandable sealing element; one or more fluid ports positioned between the two reversibly expandable sealing elements and arranged to be put in fluid communication with the fluid-carrying string; a first anchoring device arranged to engage a pipe body in a well; and one or more electromotors arranged at least to operate the two reversibly expandable sealing elements and the first anchoring device. The downhole tool further includes a first mechanically activatable release mechanism arranged at least to disengage the first anchoring device from the pipe body. A method is for utilizing a downhole tool.