How To Use Reaming Bit

  • After Reaming Bit mentioned the surface, unload the drill bit and carefully take out the core from the core tube, wash away the mud on the surface of the core, measure the length of the core, and put the core in the core box in order, and mark the extraction The core drilling depth and core take rate are calculated and recorded.

      After the core is taken out, the drill tool is equipped, and the drill bit that is worn out and cannot be used is replaced. Reassemble the drill tool and lower it to the bottom of the hole to continue drilling.
    If drilling through unstable rock formations and the use of special flushing fluid cannot prevent the leakage, collapse or expansion of the well wall, a casing string can be placed in the hole to cover the unstable rock formation hole section, and the smaller one can be replaced later. Drilling tools continue to drill.
       To prevent the borehole from bending, the spatial orientation of the borehole should be grasped in time, and the inclination and azimuth angle of the borehole should be measured every 50 meters. After reaching the expected depth, drilling should be stopped and the whole set of drilling tools should be lifted out. Then, geophysical logging can be performed to measure the depth, thickness, temperature, and bending of the borehole. Finally, the borehole is sealed, and cement slurry or other materials are injected.
      Core tube classification
      Single-layer core tube: The single-tube drilling tool has simple structure and convenient processing. It is a common core tool for carbide and steel core drilling. Because the flushing fluid in the single-pipe drilling tool is sent from the drill pipe into the core pipe. The drilling rig accessories that directly rush to the top of the core, and the impact and friction of the core tube rotation on the core, the core is very easy to wear, so it is only suitable for relatively complete and stable formations.
       Double-layer core tube: The double-layer core tube is formed by adding a core containing tube (inner tube) to the original core tube (outer tube). According to whether the inner tube rotates during drilling, there are two types of double action and single action:
       Double-layer double-acting core pipe (double-acting double pipe): The outer pipe rotates, and the inner pipe also rotates.
       Double-layer single-acting core pipe (single-acting double pipe): the outer pipe rotates, but the inner pipe does not rotate.
       Double-layer core tube can isolate the flushing effect of flushing fluid on the core. Double-acting double pipes are used for water isolation and no vibration isolation, which are used in soft, loose and easy-to-erosion formations; single-acting double pipes can isolate water and vibration, and have a wider range of applications. Extension Drilling Tools basically use single-acting double pipes. Rig accessories for drilling tools.