Low pH water-based polymer mud (mud PHPA)

Low pH water-based polymer mud (low pH PHPA mud /) is one of the famous water-based mud systems because it is partially hydrolyzed polyacrylamide (PHPA) particles that function as protective colloid in the mud drilling. As you know, the water phase will act causing problems shale formation borehole drilling wells that collapse, swelling clay, cut build, etc.. With PHPA in the system, it will help prevent these serious problems because the wells will PHPA bonding around the reactive shale. With this chemical mechanism, solid training can be dispersed in water based mud.

 

The general parameters to keep the PHPA mud in good shape.

 

Fluid loss - Normally, 15 to 20 ml API 30 minutes with test filter loss is good choice for fluid loss PHPA mud. For instant, I personally used to drill wells with 20 ml PHPA fluid loss and before I go down the hole I lost 5-8 ml of fluid which helped me to lead chains completion sweetness. You must learn what the best practices in your area to get the most optimized value for your operation.

 

Methylene blue test - Generally, MBT should be maintained around 15 to 20 pounds per barrel. If you have too many MBT, you have a problem with the rheology than PV, YP and gel strength.

 

pH - You may consider keeping the pH of the mud around 8.0 - 9.5.

 

Gel Strength - There is no firm rule for frost resistance. I used to run the mud 15 to 35 / ft2 B/100 of 30-minute frost resistance. Depending on what your goal is, for example, I used to run fine PHPA mud to wash training. However, I used to run 35 to keep the dipstick hole.

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