Mud Contamination

Chemical Contamination of Drilling Fluids

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Definitions Contaminants Materials that enter the drilling fluids system and alter its properties in an undesirable way are called contaminants . 

Contamination It’s a source in which can result high changes in 

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 Severity of Chemical Contamination 

Depends on:  – Type of Mud System  – Chemistry of the Mud  – mount of Solids  – Type of Solids  – Concentration Concentra tion Concentratio n of the Contaminant  – Temperature

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Contamination ! Types 

Chemical  – Salt  – Calcium  – Magnesium  – Cement  – Carbonates  – "#S

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Salt Contamination ! Sources  

Salt formation Salt water flow



%ey Indicator   – Chloride increase

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Salt ! Tr Treatment eatment        

&aise Density to Stop 'low if pplicable Chemical &emoval (ot )ractical Dilution may help Deflocculate Clays Increase p" *ower 'luid *oss &educe Calcium if (eeded Convert to a Compatible System System + Salt Saturated

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Calcium-Magnesium Calcium-Magnesi um ! Sources



Salt 'ormations Salt ater 'lows



nhydrite-/ypsum 0eds



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Calcium-Magnesium ! Treatment 

Chemically &emove Calcium or Magnesium Deflocculate Clays



*ower 'luid *oss



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Calcium-Magnesium ! Treatment 

If Calcium ! from formation or ma1eup water  

Treat with Soda sh



Ca 3 3 3 (a#C$4 

CaC$4

3 #(a3

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Cement ! Sources



Drilling out of Casing )lugging 0ac1 for Side Trac1s



S9ueee $perations



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Cement ! Severity

Cured Cement

Green Cement

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Cement Contamination ! Treatment

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Cement ! Chemical Treatment

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Carbonates ! Chemical Composition

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Carbonate Contamination ! Source

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