Synthesis and Weak Hydrogelling Properties of a Salt Resistance Copolymer Based on Fumaric Acid Sludge and Its Application in Oil Well Drilling Fluids.

With the increase in FAS proportion, the AV and PV of the complex saline-based mud showed a decreasing trend ( Figure 5 a,b), but FL API did not increase significantly ( Figure 5 d), indicating that the addition of a certain proportion of FAS can significantly reduce the viscosity of the complex saline-based mud, and the filtrate loss reduction performance will not be significantly reduced.

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