OF: Non Wu (Liaohe Oilfield Company) Keywords: buried deep reservoir; low productivity; high static pressure difference; leakage gap; dual pump cylinder; Seoul where the dual fixed; pump efficiency Abstract: Dawn light oil old oil field deeply buried low Production capacity, the application of ordinary pumps to deepen the pump deep pumped practical effect is not good. In response to this problem, research and design a new double-cylinder small diameter pump, the deep-pumping oil technology and experimental research, has been successful, and achieved good economic and social benefits. Also further improve the deep well supporting technology (P74 ~ 76, Table 2, Figure 3 Senate 5, Liu Zhaoshi pick). Source: "special oil and gas reservoir" 2006 the sixth period