Mixing Procedures

The addition of components in their proper sequence when initial mixing an oil mud will optimize the performance of each product. The order of addition as listed below is the most common procedure for preparation of oil base muds, though each mud system may require some modification of this procedure. The mixing time may vary depending upon the amount of shear either at the rig or at the liquid mud plant. Organophilic viscosifiers require considerable quantity of shear to fully develop their viscosity; therefore, more of this additive may be required on initial mixing. As the oil mud is used over the first couple of days, improvement in the emulsion stability and fluid loss control will vastly improve compared to what the mud was when it was initially mixed.

  1. Add the required quantity of base oil to the mixing tank.
  2. Add the primary emulsifier and secondary emulsifier as required.
  3. Add filtration control additives if required.
  4. Add lime as required.
  5. Add required amount of water to the above mixture. If brine is to be used, then add brine after the lime additions.
  6. Add organophilic viscosifier as required.
  7. Add calcium chloride powder if brine is not used. If calcium chloride powder is not available, then mix the calcium chloride flakes into the water and add as a brine.
  8. Mix above for several hours to ensure a good emulsion is formed.
  9. Add weighting material as required for the desired density.

The viscosity contributed by the organophilic gellant will be higher if it is added to the mud after the water is added and before the calcium chloride is added. If brine is used, then the gellant is added after the brine and the viscosity will generally be lower. The electrical stability of the mud after mixing will be lower initially if brine is used instead of adding calcium chloride to the mud after the water is added.

The electrical stability and fluid loss control will improve after use due to the shear generated during circulation. The above mixing procedure will be suitable for most mud systems. The supplier's mixing procedure should first be reviewed to determine if any variations in the above are to be employed.

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Responses

  • clotilde
    How to mix calcium chloride for drilling fluids?
    8 years ago
  • sirja
    Why add lime before emulsifier in preparing oil base mud?
    8 years ago
  • jaana anttila
    How to mix killing drilling mud?
    3 years ago
  • zane hay
    How to prepare oil based mud?
    2 years ago
  • martha
    How to qprepare oil based mud?
    2 years ago
  • Yorda Temesgen
    What is sequence for. mixture contents of drilling fluid mixture?
    1 year ago
  • Aila
    What is the sequence for mixing contents of drilling fluid mixture?
    1 year ago
  • SOPHIA
    How to prepare oil based mud from scratch?
    3 months ago

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