Application of Separable Perforating-Fracturing Combined Bullet to the Test of Oil and Gas Wells

<正> Along with the progress of thetechnique of oil-gas field devel-opment, an attention is generallypaid to the formation damage bydrilling and well cementing inprocess of well completion. Inthe end of 1980s, the petroleumenterprises have introduced theperforating bullets from Schlumberger and Hal-liburton, co. Through their contrast and test withthose manufactured in China, it is considered thatthe Schlumberger's deep perforating bullets can e-liminate the damage by drilling and raise oil pro-duction. The test in Moxi and Bajiochang gas fieldsin Sichuan indicated that the oil and gas productionfrom carbonate and sandstone reservoirs obviouslyincreased. Therefore, the importance to the study