then the ultrasonic horn was placed into the pipe simulating a stuck pipe scenario in the laboratory as shown in fig2 no sonification was applied in the first test the application of pulling force was initiated and applied to the stuck pipe in gradually increasing magnitude until the pipe was released the load required to free the pipe was recorded in this case then other identical tests were run with the stuck pipe scenarios but this time sonification was applied for 1 3 5 10 15 20 25 30 and 35 minute intervals respectively after various time sonifications a small pulling force was applied and then the force was gradually increased until the pipe was released the sonifications were repeated at three energy levels 30 amplitude 50 amplitude and 70 amplitude a summary for the aloxite cylinder at various amplitude and sonification times is presented in fig3 fig3 is a graph showing the reduction in pull out freeing force as a function of sonification time for an aloxite hollow cylinder sample damaged by drill in fluid where the filter cake was built at an elevated pressure and room temperature the pullout force ratio is the ratio of freeing force after sonification to freeing force before sonification the fastest reduction in the freeing force was observed when 70 highest power was applied however any amplitude level and timing of sonification helped reduce the freeing force compared to the case of no sonification the results for berea hollow cylinder cores are shown in fig4 different samples were used to test the effect of increasing sonification time for all the tests except the 40 minute sonification test a pulling force was applied to free the pipe however the longer the sonification time the smaller was the magnitude of the required force.