Borewell got filled with mud within 10 hours

We had borewell with depth of 560 feet. We re-drilled it to get to 700 feet. After 600 feet we got clay type mud. At 670 feet we got about 4 inch water and we finished drill till 690 feet. After 10 hours when we started putting motor in the borewell it went till 610 feet. There was only muddy water which lasted for 30-40 min. We lost the point of source of water as it got filled with mud. Now we have kept the motor at 545 feet and now there is hardly any water and it runs only for 5 min and water is muddy. What is the solution to avoid borewell getting filled with mud and clearing the borewell till 690 feet? Please suggest.