Species blocking agent and its preparation method to improve the bearing capacity of the

The present invention relates to the field of oil and gas wells a reagent, a blocking agent is disclosed and its preparation method to improve the bearing capacity of the seed, wherein the blocking agent comprises water, bridging particles, filler particles and the cement material, and with 100 parts by weight of water as a reference, the amount of bridge particles is 3-15 parts by weight, the content of the filler particles is 5-23 parts by weight, the content of the cementitious material is 4-11 parts by weight. Blocking agent according to the present invention can improve the bearing capacity of the formation plugging during drilling, drilling for ultra-deep malignant dropout diverting technology, highly efficient, rapid plugging performance, particularly applicable to conventional blocking agent malignant dropout case is difficult to produce the effect of the depth of over 3000 m of the formation.