Preparation and performance evaluation of ultra-deep water drilling fluid with strong inhibition
In order to solve the problems such as insufficient hydration inhibition and plugging properties and poor rheological properties of mud clay in ultra-deep water drilling,a silicon-O-silicon main chain polysiloxane inhibitor MNT was synthesized by three steps of ring-opening polymerization,silane hydroaddition and quaternization.The results show that MNT does not affect the rheological properties of the strongly inhibited ultra-deepwater water-based drilling fluid system.Under 20％cuttings pollution,the viscosity and shear force increase slightly.Compared with the original ultra-deepwater water-based drilling fluid system with strong inhibition,the secondary rolling recovery rate of the system increased from 86.9％to 93.6％after adding MNT,and the anti-swelling rate increased from 81.9％to 91.5％at 90℃,which has a better ability to inhibit mudstone hydration expansion and hydration dispersion.NaCl is more effective than KCl in inhibiting hydrate formation under the same pressure.
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