Diesel air compressor supplies compression air for driving boosters that boosts the pressure of mixed gas of helium and nitrogen led from the mixing device and delivers the gas into central tube of packer in order to seal the space of tubing and casing at the coupling. The booster continues to work till reaching the sealing testing pressure, then the helium detection device will test the coupling sealing performance of tubing and casing.
Hydraulic wrench mainly is used to lift up and down packer into tubing and casing, makes packer rubber accurately jamming at the two ends of coupling, finally creates a cavity for the inspection.
Helium is of small diameter, easy infiltration, and co-use helium leak detector is of high sensitivity that check out leak rate up to 1×10-7 bar,mL/sec helium. Therefore, put helium as the testing medium, helium leak detector check sealing performance of tubing, casing threaded connection- reliability is higher.