DOC-G85S(631S-2) is a kind of polymer fluid loss additive.It is mainly composed of AMPS/NN, which has good temperature and salt resistance, and is copolymerized with other salt resistant monomers.The product introduces non hydrolyzable groups, significantly enhancing its high-temperature resistance, and containing a large number of highly adsorptive groups such as - CONH2, - SO3H, - COOH in the molecules, which play an important role in temperature resistance, adsorption of free water, and water loss reduction.

DOC-G85S(631S-2) is a kind of widespread use product,which can be used in different kinds of cementing slurry system and has good compatibility with other additives.

DOC-G85S(631S-2) has the characteristics of low slurry viscosity and high shear rate viscosity, which can effectively enhance the suspension stability of the cement slurry system, while maintaining the fluidity of the slurry, preventing sedimentation, and having good anti gas channeling performance.

DOC-G85S(631S-2) is suitable for a wide range of temperatures and can withstand high temperatures up to 230 ℃. It can help the cement slurry system with good flowability and stability, with less free water and no retarding. The early strength development at low temperatures is fast.


Physical Properties




White to light yellow powder


Cement Slurry Properties


Technical Index

Test Condition

Fluid loss,mL



Thickening time,min



Initial consistency,Bc


Compression strength,MPa


80℃,atmospheric pressure,24h

Free water,mL


80℃,atmospheric pressure

Slurry composition:100% Class G cement(high sulfur resistance)+44.0% freshwater+0.6% DOC-G85S(631S-2)+0.5 % defoamer


Usage Range

Temperature:below 230℃(BHCT)

Recommend dosage:0.6%-3.0%(BWOC)



Packaged in 25 Kg multi-ply paper sack with waterproof plastic film inside. Or based on customers' request.


DOC-G85S(631S-2) can also supply liquid product,

the liquid product model is DOC-G85L(631L-2).

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