On May 26^th, ZPEC Petroleum Technology Co., Ltd. and Shaanxi Rip Petroleum Co., Ltd. completed the multi-stage perforation of staged fracturing for Well 121 Ping 1 in the Yanchang Oilfield, setting a new record for multi-stage perforation of cable pumped bridge plug in domestic perforation and horizontal well drilling. This horizontal well is the deepest well ever constructed in the history of Nanniwan Oil Production Plant, with 6 perforating sections, high formation pressure, and difficulty and risk of construction.  The pumping bridge plug multi-stage perforation well depth is 1,849 meters, the vertical depth is 925 meters, and the horizontal section is 731 meters.

After receiving the construction task on May 25th, the Perforating Team quickly organized the Technical Expert Team and held their technical analysis meeting of "one depth, one case", "one section, one case", and carefully designed the construction scheme with detailed construction links.  According to the differences of the well, such as ultra-deep and high pressure, long pumping distance and so on, the corresponding measures and emergency plans were made to ensure the safety of the project.  During the construction, the site personnel strictly followed the construction standards, strengthened the node controls, and reasonably reduced the pumping speed in the key link.  After three days and two nights, the perforating task of the pumping bridge plug was finally completed with high quality.  The success rate of the first entry into the well was 100% and the perforating emission rate was 100%, which was highly recognized by the Party A.