Abstract: In order to effectively seal fractured thief zone,and avoid poor plugging effect caused by particle size match error,chemical consolidation plugging agent HDL-1 has been developed with features of high strength and high temperature resistance.In view of shortcomings of conventional consolidation plugging agents such as poor resistance to high temperature and low density adjustability,the authors selected positron bonding material,chemical coagulant,reology control material,triggering material and density modifiers after extensive laboratory tests on retention ability,consolidation time,strength and density,determined the optimal proportion of these materials,and developed the chemical consolidation plugging agent HDL-1.The plugging agent HDL-1 had advantages such as adjustable thickening time(4-12 h),adjustable density(1.3-1.9 g/cm3),and high pressure bearing capacity(48 h strength17 MPa).The chemical consolidation plugging agent has been successfully applied to improve the formation bearing capacity by 8.2 MPa for Well SX2 Permian fractured thief zone in Tahe Oilfield,resulting in satisfactory drilling results.The chemical consolidation plugging agent HDL-1 could effectively seal fractured thief zone,which provided technical support for the sealing of Permian igneous leakage zones.