Troubleshooting rheology high in oil-based mud

You will be able to see that you rheology of the mud is bad when you see the change in trend of plastic viscosity (PV) and yield (YP) .

 

 

 

There are several causes that deteriorate rheology of the mud which are listed below:

 

Water contamination - As you may know that in oil-based mud, water acts as a solid.Once you have contamination of the water, your mud will be thicker.

High solids in the drilling mud - Both because of drilling solids and barite high PV and YP.

Excessive clay - clay in the system reacts chemically with the oil based mud rheology causing high.

contamination of CO2 - CO2 Act in the same way as clay. Plus you have CO2, more difficulty you have with the mud.

How to solve rheology high in oil-based mud

Dilution - You need to keep the solids in the specification thus diluting fluid new base will be lower overall solids content in the lower PV and YP.

Emulsifier - You can consider adding emulsifiers to enhance emulsion mud.

Lime - If you drill into the formation containing CO2, adding an excess of lime (Ca (OH) 2) in the control system of acid gases such as CO2. CO2 and lime will chemically react the following chemical reaction:

Ca (OH) 2 + CO2 -> CaCO3 + H2O

 

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