How to choose the high quality of well cementing dispersant?

Dispersant, also known as drag reducing agents, water slurry dispersant is added to improve its liquidity, the use of dispersants after the grout has a low viscosity at low pump pressure up to turbulence, so the more power required small wells and can reduce leakage and slurry dehydration in advance. Some use fluid loss additive can lead to an increase in viscosity slurry system, in order to improve pumpability, must be added dispersant. Oil well cement depends on the interaction between the particles surface charge distribution, water slurry dispersant is by adjusting the particle surface charge in order to obtain suitable rheological properties.
The commonly used dispersants are the following types:
1. Sulfonated ketone aldehyde condensation dispersants: it can resist high temperature, good compatibility with a variety of additives, low cost, but poor applicability with variety of cement slurry.
2. Naphthalene-based dispersant: it can only used in low temperature, the advantage is low cost.
3. Polylactic acid-based dispersant: Mainly used in construction applications, the industry is rarely used in oil well cementing, the advantage is low dosage.
4. AMPS polymeric dispersants, it can resist high temperature and high salt. good applicability With a variety of cement and various additives, but the disadvantage is the high cost.
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