Mount wells

Mount wells

When drilling there is a need of well cementing.

  • weak sustainability weak rocks which may occur collapse of the borehole walls
  • danger of fall of pieces of rock from the borehole walls when crossing zones of tectonic disturbances
  •  danger of fall of pieces of rock from the borehole walls when crossing zones of tectonic disturbances

Temporary casing is mud in the process of drilling.

For permanent well casing used drilling casing pipe. During rotary drilling, well cementing with drilling pipes is carried out in the following order.

  • before attaching, thoroughly washed well
  • measure its depth
  • check the threads and the curvature of the drill pipe.
  • in the drilling log records the length of each drill pipe.

The annulus is isolated, the Shoe of the drill string pipes tamponiruut clay or cement.
In deep drilling well design is determined bу the amount lowered to the drill string, depth of installation, diameter, thickness and strength group used drill pipe diameter drill bits and drill pipes used for drilling for each drilling column, and a lifting height of grouting material in the annular space of the well.

In casing design the following types of drilling columns:

  • the conductor-drilling the first casing string used to attach the top of the unstable intervals of the cut, to protect the well bore from erosion and direct the flow of drilling fluid in a trough (groove).
  • production casing -isolation of productive horizons and isolating them from other horizons of the section, and also to extract water to the surface.
  • filter column is installed directly in an aquifer from a septic tank and «flush» in the production casing with a packer.