Treatment method for drill jamming accident caused by cement in casing pipe

The invention discloses a treatment method for cement jamming accidents in a casing pipe, and relates to the technical field of petroleum and natural gas drilling. Firstly, a well section where a drilling tool is solidified by cement is determined; then the drilling tool which is not stuck is pulled out; chamfering inner and outer ring teeth of the used milling ring; milling and back-off fishing operations are carried out by changing a fish head sleeving mode; casing milling is conducted to the corresponding position, an underground jarring tool is put down for buckling, and then up-down jarring jam releasing is conducted; the drilling tool solidified by the cement in the casing pipe through the method can be smoothly fished out of a well, so that normal construction operation can be recovered, the casing pipe can be effectively prevented from being milled through, the drilling tool can be effectively prevented from being milled broken, and the drilling tool can be prevented from being damaged in the casing m