Does Potassium Formate drilling fluid require a specific pH value?

Potassium Formate drilling fluid

Drilling fluid is often referred to as the “lifeblood” of drilling operations. In China’s shale gas exploration, liquids, which are widely used in deep well drilling, marked the significant improvement of domestic petroleum diamond exploration solutions. But does Potassium Formate drilling fluid have specific pH requirements?
Understanding the pH Value in Potassium Formate Drilling Fluids
The pH of a drilling fluid represents the acidity or alkalinity of the fluid, indicating the concentration of hydrogen ions. When the pH is below 7, the drilling fluid is considered acidic; a pH of 7 is neutral, and a pH above 7 indicates an alkaline drilling fluid. pH measurement is typically carried out on-site.
Impact of pH on Potassium Formate Drilling Fluid
The pH value plays a crucial role in determining the properties of Potassium Formate drilling fluid. Clay particles in the drilling fluid exhibit stability in alkaline environments due to their large negative charge and high cation capacity. Additionally, many organic treatment agents, such as tannin and rotic acid, are most effective under alkaline conditions. Moreover, maintaining a pH above 8 in Potassium Formate drilling fluid is essential, as low pH levels can lead to the fermentation of organic treatment agents at elevated temperatures.
However, it’s important to note that the adsorption of hydrogen ions on the clay surface due to pH can promote the expansion of flour hydration, which may not be favorable for anti-collapse measures. Each type of drilling solution has a specific pH range suitable for its best performance. For instance, high alkaline drilling solutions typically have a pH between 12-14, while low-fixed-phase drilling solutions prefer a pH range of 8-9. Weakly acidic drilling solutions and saturated saline diamonds generally aim for a pH range of 6-17. Maintaining the pH within the appropriate range ensures that Potassium Formate drilling fluid exhibits lower stickiness, minimal water loss, and relatively stable performance. The pH value is the basis of determining the alkaline ratio.
Tests conducted in Saudi Arabia involving KCI/BASO4/CACO3 drilling solution and Potassium Formate/CACO3 drilling solution (with a density of approximately 1.52 kg/L) entering the UNAYZAH-B reservoir have shown promising results.

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