•The acidity or alkalinity of a drilling mud is indicated by the Hydrogen ion concentration, which is commonly expressed in terms of pH.
A perfectly neutral solution has a pH of 7.0, whereas alkaline (basic) solutions have a pH range between 7.0-14.0, and acidic solutions have a pH less than 7.0.
•The pH measurement is used as well to indicate the presence of contaminants such as cement or anhydrite.
Test Procedure
•pHydionPaper:
–This method may be used on the mud filtrate, or whole mud directly. –Place a 25 mm (1 inch) strip of indicator paper on the surface of the mud to be tested and allow it to remain until the liquid has wet the surface and the color has stabilized.
This takes approximately 1 minute.
–Compare the color standards provided with the test paper (which was not in contact with the mud solids) to the color standards provided with the test paper, and estimate the pH of the mud accordingly.
•Color pH Strips: –This method applies onlyto the mud filtrate.
–After obtaining a sample of mud filtrate, totally immerse the colored portion of the color pH strip into the filtrate, and remove immediately.
–After a short period of color stabilization (10-15 seconds), compare the color of the wetted strip with the color standards provided in the color pH plastic container.
•An estimate may be necessary if a color does not exactly match a particular pH value.
A perfectly neutral solution has a pH of 7.0, whereas alkaline (basic) solutions have a pH range between 7.0-14.0, and acidic solutions have a pH less than 7.0.
•The pH measurement is used as well to indicate the presence of contaminants such as cement or anhydrite.
Test Procedure
•pHydionPaper:
–This method may be used on the mud filtrate, or whole mud directly. –Place a 25 mm (1 inch) strip of indicator paper on the surface of the mud to be tested and allow it to remain until the liquid has wet the surface and the color has stabilized.
This takes approximately 1 minute.
–Compare the color standards provided with the test paper (which was not in contact with the mud solids) to the color standards provided with the test paper, and estimate the pH of the mud accordingly.
•Color pH Strips: –This method applies onlyto the mud filtrate.
–After obtaining a sample of mud filtrate, totally immerse the colored portion of the color pH strip into the filtrate, and remove immediately.
–After a short period of color stabilization (10-15 seconds), compare the color of the wetted strip with the color standards provided in the color pH plastic container.
•An estimate may be necessary if a color does not exactly match a particular pH value.
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