▎ 摘　　要

NOVELTY - Pod-type degradable temporary plugging ball, comprises a degradable outer shell and an inner core. The shell comprises copolymer D, copolymer of ethylene α-olefin and nano filler. The copolymer D is polymerized by glycolide, lactide, polybutylene succinate prepolymer. The inner core comprises degradable flexible materials including copolymer of butylene adipate and butylene terephthalate (PBAT), polybutylene succinate-adipate resin (PBSA) and/or thermoplastic polyurethane elastomer rubber (TPU). USE - The pod-type degradable temporary plugging ball is useful in temporary plugging treatment of oil and gas wells in fracturing system (claimed). ADVANTAGE - The pod-type degradable temporary plugging ball can block perforation holes and fracturing cracks, and has a remarkable effect of forcing the working fluid to divert; after the construction, the temporary blocking ball is hydrolyzed into water-soluble liquid acid and alcohol, and discharged together with other liquids, without the risk of blockage. DETAILED DESCRIPTION - INDEPENDENT CLAIMS are included for: Preparing pod-type degradable temporary plugging ball, comprising 1) taking glycolide, lactide, polybutylene succinate prepolymer and catalyzer and carrying out polymerization reaction to obtain copolymer D; 2) blending the copolymer D, the copolymer of ethylene α-olefin and the nano-filler, granulating, and preparing the half of the shell by injection molding; 3) injection molding a degradable flexible material into the inner core; 4) assembling the inner core into the shell, and gluing the two half shells to obtain final product; Use of pod-type degradable temporary plugging ball in temporary plugging treatment of oil and gas wells, comprising pre-placing the temporary plugging ball in the riser connected to the hydraulic valve of the fracturing system, and opening the hydraulic valve before or during fracturing, the temporary plugging ball enters the high-pressure manifold, and injecting the fracturing fluid into the wellbore, and observing the pressure change at a certain displacement, when the pressure changes significantly, it means that the temporary plugging ball has blocked the hole, and the next fracturing operation is carried out, where the length of the riser is 0.5±0.1m; the displacement is 6-18 m/minute.3