Safety valve for production wells

A safety valve for extraction wells, configured to be installed on an oil well head and to enclose a portion of a tubular material inserted inside the well, the tubular material being internally hollow and configured to contain and transport fluids and other substances extracted from the well, the safety valve comprising:

• a central hole through which the tubular material passes;
• a blocking system, configured to firmly keep the tubular material to be cut fixed with respect to the safety valve;
• a cutting and closing group configured to cut and close the well under certain operative conditions;
• and
• a sealing mechanism, configured to actuate a hydraulic sealing of the well, after the cutting;
• wherein the cutting and closing group includes a hole saw housed in a respective chamber of the cutting and closing group, the hole saw being rotated by a motorized actuation means and being configured to move in a controlled mode along a substantially orthogonal direction with respect to a development direction of the well, and
• wherein a movable protection element is slidingly inserted inside the cutting and closing group, which at least partially surrounds the hole saw and which is configured to move along a same movement direction as the hole saw to arrive into the well and go in contact against the sealing mechanism, to effect hydraulic sealing of the central hole of the safety valve and consequently of the well.