Schlumberger

CLEAR Hole Cleaning and Wellbore Risk Reduction Service

Compensation for variable mud coating

Because the coating of mud on cuttings can vary considerably, a correction factor called the equivalent dry cuttings ratio (EDCR) is applied to account for the variation. The wet cuttings weight is thus converted into an equivalent volume of dry cuttings, which can be compared with the theoretical volume of formation drilled at any time.

The CLEAR service measures or computes and records the following data:

  • cumulative wet weight of cuttings falling from the shakers
  • cumulative dry weight of cuttings
  • measured dry cuttings volume
  • theoretical dry cuttings volume
  • measured cuttings flow rate (dry flow)
  • theoretical cuttings flow rate (nominal flow), based on ROP
  • volume excess or deficit
  • percentage of cuttings recovery.

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Real-Time Cuttings Flow Information

The CLEAR service results are accessible online whenever and wherever it’s needed—at the rigsite or remote offices.
The CLEAR service results are accessible online whenever and wherever they are needed—at the rig site or remote offices. Download brochure (3.3MB PDF)