Abstract:Self-healing material is a kind of material can heal itself after being damaged by external action. It is of great significance to prolong the service life of materials, eliminate safety hazards and reduce maintenance costs. In recent years, it has been widely researched and applied in the field of oil and gas drilling and production. Self-healing materials are classified into external and intrinsic types based on different healing methods. The healing mechanisms and characteristics of external (microcapsules, oil and gas activated materials, differential pressure activated sealants) and intrinsic (physical self-healing, chemical self-healing) self-healing materials are systematically summarized in this paper. Physical self-healing mainly includes hydrogen bonding, hydrophobic association, ionic bond actions, host-guest recognition. Chemical self-healing mainly includes the combination and fracture of imine bond, acylhydrazone bond, disulfide bond, etc. The research status of different types of self-healing materials in the fields of well cementing, downhole pipe fittings repair, leak-proof plugging, wellbore strengthening, fluid loss reduction, and profile control and water shutoff is summarized, and the prospects for their development are prospected.