(1) According to the test requirements, select the Drilling Stabilizers manufacturers appropriate field, and the rig is securely installed.
(2) large diameter drill bit to a predetermined test depth. Remove the core, will be described.
(3) with polished polished drill hole bottom, hit the bell with a cone drill.
(4) drill bit with a small aperture test hole, big hole coaxial requirements, remove the core described 50cm deep; when the hole wall is not smooth, diamond reamer reaming should be used; when Forging roller reamer the core breaker should be repeated (2) (3) step, until you find the complete core position.
(5) cleaning the test hole, and the hole wall is dried.