适用于新疆沙排9组地层抗高温新型离子液体抑制剂及抑制机理OA北大核心

The effect of reservoir lithology on the stability of the wellbore in Xinjiang Shapai Group 9 was investigated from multiple perspectives via X-ray diffraction,infrared spectroscopy,scanning electron microscopy,and water contact angle.The inhibition performance,inhibition mechanism,and application of three typical ionic liquids(MOA,CP-DES,MM6)were evaluated.The rocks in this group have a high content of clay minerals and contain a large number of hydroxyl groups on their surfaces,which are highly susceptible to swelling with water.Among the samples treated by three ionic liquid inhibitors,the lowest linear swelling rate(21.2%),the highest hot-rolling recovery(63.1%,180℃),and the excellent application results of drilling fluid system indicate that deep eutectic solvent ionic liquid(CP-DES)is the most suitable inhibitor for the Xinjiang Shapai Group 9.Further studies revealed that CP-DES could form strong interactions with the clay surface through hydrogen bonding and enter the clay interlayer to hinder the intrusion of water.Meanwhile,the cationic groups could compress the electric double layer on the clay surfaces and weaken the electrostatic repulsion between the particles,which consequently inhibited the hydration swelling of the clay.