World Oilfield Forum
We have received the following information & amazing photos in email
"While were pumping at 8500 psi in a Granite Wash completion the 7” production casing parted, the surface casing parted above that, launching the frac stack (hydraulic valves and Stinger isolation tool) and all frac iron - landing in the middle of the Cased Hole truck.
My guess here is the casing parted at the connection from cold water shrinking the unsupported pipe (un-cemented) and putting it in severe tension, making the casing fail at the collar connection. Keep in mind it parted on the 7” and immediately failed the surface casing connection with the upward force. Quick and easy math of the pressure over the surface area upon parting is 327,250 lbs upward force!
There were no fatalities. The Cased Hole engineer was in the recorder cab sitting against the wall that remains standing when the iron landed, only suffered a concussion and was the only injury on location."