Silt and air has blocked the bore - Could you please suggest solutions to bring the pipe up

Dear Sir,
We have a 600 ft borewell for the last 10 years. We use a compressor motor. A few days ago the water stopped coming. When the plumber examined the bore water was found at around 10 ft. When he tried removing the water delivery and air pipe it did not move more than 2 feet, it seemed stuck. He tried pumping the pipe but it did not come out.  He suggested pouring 25 kgs of urea along with soap into the borewell to loosen up the mud/silt.  Kindly advise if it is the right thing to do. Also can you please suggest alternate solutions or what else needs to be done to bring the pipe up.

Thanks in advance,
Karan

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