Whole Mud Chloride ClOM

The chlorides in an oil mud (ClOM) are used with other data to calculate the salinity of the aqueous phase and from there, to calculate solids content.


  1. Using the same sample from the whole mud alkalinity test, ensure that the mixture is acidic (below pH 7.0) by adding 1-2 drops of 0.1N sulfuric acid.
  2. Add 10-15 drops of potassium chromate indicator solution. While stirring rapidly with a magnetic stirrer, slowly titrate with 0.282N silver nitrate until a salmon pink color remains stable for at least 1 minute. Record cm3 of 0.282N silver nitrate per cm3 of sample (2 cm3) required to reach endpoint. (This is VSN on the Mud Report.)

Note: Additional potassium chromate indicator solution may be required during titration process and it may be necessary to stop the stirring of the mixture and allow separation of the two phases to occur to see the color of the aqueous phase. V_^

3. Calculate Whole Mud Chlorides (ClOM) as follows:

V _ cm3 of7 0.282N Silver Nitrate SN _ cm3 of mud

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  • Sara
    What chloride content to report mud drilling?
    5 years ago
  • j
    What is added to mud in a chloride test?
    9 months ago
  • Christopher
    How to calculate increase in chlorides in drilling mud?
    9 days ago

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