Micro-crosslinking emulsifier composition, micro-crosslinking emulsifier, preparation method of micro-crosslinking emulsifier and oil-based drilling fluid

The invention belongs to the technical field of oilfield chemical drilling fluids, and discloses a micro-crosslinking emulsifier composition, a micro-crosslinking emulsifier, a preparation method of the micro-crosslinking emulsifier composition and the micro-crosslinking emulsifier, and an oil-based drilling fluid. The composition comprises fatty acid, polyamine and a cross-linking agent which are stored independently. The weight part ratio of the fatty acid to the polyamine to the cross-linking agent is (12 to 35): (5 to 10): (1 to 9). The oil-based drilling fluid can resist the temperature of 200 DEG C, and when the cross-linking agent is dicumyl peroxide (DCP), the demulsification voltage can be stabilized at 450 V or above after the oil-based drilling fluid is aged for 16 hours at the high temperature of 200 DEG C. 本发明属于油田化学钻井液技术领域，公开了一种微交联乳化剂组合物和微交联乳化剂及其制备方法以及油基钻井液。所述组合物包括各自独立保存的脂肪酸、多胺和交联剂；且所述脂肪酸、所述多胺和所述交联剂的比按重量份计为(12-35)：(5-10)：(1-9)。该油基钻井液抗温达200℃，以及在交联剂为过氧化二异丙苯(DCP)时，在200℃高温条件下老化16h后破乳电压能够稳定在450V以上。