21. It is also possible once a borehole is complete to measure the permeability. 22. This could result in key seating and pipe digging into the borehole wall. 23. After drilling, the module will place a time capsule into the borehole . 24. The Askam Borehole discharges of acid mine drainage per minute into Nanticoke Creek. 25. Permeable sections of a borehole wall develop a thick layer of mudcake during drilling. 26. Modern neutron logging tools usually include two detectors to compensate for some borehole effects. 27. Chinese borehole sites could reach as deep as 600 m ( 2000 ft ). 28. For many years, the world s deepest borehole was the Kola Superdeep Borehole. 29. For many years, the world s deepest borehole was the Kola Superdeep Borehole . 30. The borehole is operated by Severn Trent Water.
