我指挥部工程技术队在毛主席革命路线指引下,以阶级斗争为纲,认真贯彻毛主席一系列指示,深入生产实际,根据现场需要,大搞以工人为主体的三结合,研制成功了2251型丢手封隔器。这种新型丢手封隔器自一九七四年投入现场试验以来,已用于试油、隔水、卡堵水、压裂等各种井下作业共113井次,成功率83％,其中一九七五年成功率达90％,证明它能 Under the guidance of Chairman Mao’s revolutionary line and under the guidance of Chairman Mao’s revolutionary line, our engineering and technical team at headquarters commandeered Chairman Mao’s series of instructions and conscientiously implemented the actual production. In accordance with the needs of the scene, we vigorously engaged in the three-centered combination of workers, and successfully developed 2251 Lost packer. Since its introduction into the field in 1974, the new Lost Packers have been used in a total of 113 wells in a total of 113 wells, including oil testing, water blocking, water plugging and fracturing, with a success rate of 83%, of which The success rate of 90% in 1975 proves that it can