The principle of well washing of sodium hexametaphosphate

Sodium hexametaphosphate, also known as sodium polyphosphate and Granham’s salt, is a kind of sodium metaphosphate polymer. It is colorless and transparent glass or powder. It has strong hygroscopicity and is easily soluble in water but insoluble in organic solvents. Its aqueous solution is acidic and easily hydrolyzed into phosphite.

Sodium Hexametaphosphate
Sodium Hexametaphosphate

So what is the washing principle of sodium hexametaphosphate?

The main components of the chemical mud used in drilling are earth powder, soda ash, polyacrylonitrile amine salt,and polyacrylamide potassium salt. Clay powder and soda ash are indispensable.Clay powder is the main component of mud skinSoda ash determines the pH of the mud to be 8-9, which is weakly alkaline. The mixing of clay powder and soda ash has a stabilizing effect.


1.Add a certain proportion of sodium hexametaphosphate to well washing fluid. It can lower the PH value of the mud and weaken the stability.

2.Reduced liquid tension. It can ensure that the aqueous solution can well penetrate into the rock fissures. It is effective in contact with the mud skin and the filling clay in the cracks, and it is very weak to the drilling tool.

3. Disperse the mud. When SHMP is adsorbed on the surface of the clay, the negative charge on the surface of the clay increases. As a result, the repulsive force between the clay particles is significantly improved. At the same time, polymerized macromolecules have a large water film. It effectively enhances the hydration of clay particles.

4.It has a complexing effect on viscose. Sodium hexametaphosphate complexes with calcium and magnesium ions in clay to form water-soluble complexes. Therefore, complexation reduces the concentration of calcium and magnesium ions.

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