Safety valve installed below an activation pump in a hydrocarbon production well

摘要

In a hydrocarbon production well in which the effluent is activated by an activation pump removably installed in a production pipe in the well, a safety valve is removably mounted in the production pipe below the activation pump. The safety valve comprises, in a lower part of the valve body, a foot valve and thereabove an obturator which is moved to its open position by an operating member which is provided with a piston slideably mounted in the valve body and separating first and second chambers. The first chamber is pressurized to open the valve, and the second chamber, which acts in opposition to the first chamber, is in communication with the bottom of the well below the foot valve, and is thus isolated from the interior of the safety valve when the foot valve is closed.