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The effect of crosslinking agent content on the effectiveness of SDFL
The filtration properties of SDFL samples with different crosslinking degrees were measured in muds after hot-rolled at 150[degree]C for 16h.
The effect of the concentration of SDFL on the fluid loss for the base mud
The base muds with different concentrations of SDFL were hot-rolled under 150, 180, 200 [degree]C for 16h, respectively.
Mud systems were prepared using SDFL and other fluid loss additives.
To further establish the effectiveness of SDFL, contamination studies were performed on the base muds where the effect of contamination of 5%, 10%, 15%, 20% drill solids and 5%, 10%, 15% of 20% CaCl2 brine were measured respectively.
1 illustrated the IR spectra of humic acid (HA) and SDFL. Compared to HA, the reduction in absorption band around 1705 [cm.sup.-1] (-COOH group) indicated the reaction occurred between -COOH and -N[H.sub.2] groups and this was further proved by the appearance of new absorption band around 1649 [cm.sup.-1] (-CONH-).
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- SDF-1 receptor