Variable-diameter jam releasing device and method suitable for auxiliary tripping-in of passive magnetic steering tool

The invention relates to a variable-diameter jam releasing device and method suitable for auxiliary tripping-in of a passive magnetic steering tool, and the variable-diameter jam releasing device comprises a driving assembly, a first pressure-bearing sleeve, a second pressure-bearing sleeve, a first connecting rod, a second connecting rod, a first shaft rod, a second shaft rod and a bottom connecting sleeve. The first shaft rod is slidably sleeved with the first pressure-bearing sleeve and the second pressure-bearing sleeve, the first pressure-bearing sleeve is located above the second pressure-bearing sleeve, and the two ends of the first connecting rod are hinged to the first pressure-bearing sleeve and the second pressure-bearing sleeve respectively; the driving end of the driving assembly is connected with and drives the first pressure-bearing sleeve to axially extrude or stretch the first connecting rod along the shaft rod, so that the first connecting rod is opened or closed; the second shaft rod is coa