| 摘要 |
A choke and kill control system for stopping production of an oil and/or gas well by injecting a fluid from the outside of the well conduit into the well bore through a check safety valve. A biasing piston and cylinder assembly initially latches the valve in the open position and is actuated by a retrievable control positioned in a sidepocket mandrel. The control may be a bias valve, a rupture disc, or may be a blanking plug for maintaining the valve in the open position. The assembly may be flushed and cleaned when desired to overcome well contamination.
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