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Uncontrolled Flow Back Occurs Due to Needle Valve Leak in Fracturing Assembly

Following a well stimulation procedure the well was being flowed back at a minimal rate to the onsite test unit P Tank to lower the pressure on the well bore prior to a Coiled Tubing clean out procedure when a leak occurred . The two Master Valves  were shut along with the two Wing Valves. The four valves closed could not hold the pressure and the onsite personnel were faced with an uncontrolled flow situation. 
Following a well stimulation procedure the well was being flowed back at a minimal rate to the onsite test unit P Tank to lower the pressure on the well bore prior to a
Coiled Tubing clean out procedure when a leak occurred . The two Master Valves  were shut along with the two Wing Valves. The four valves closed could not hold the pressure and the onsite personnel were faced with an uncontrolled flow situation. 

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sa11_08.pdf