Integral dual stage casing head

Double stage casing head, belonging to the category of petroleum machinery. Its features are: the body (3) adopts an integrated design, with a conical convex platform designed at a suitable position in its inner cavity, and the hanger (11) is seated inside the body (3) by cooperating with the conical convex platform of the body (3) through a sloping retaining ring (9); The top of the hanger (11) is equipped with a support sleeve (6), which is designed with radial through holes and an inner conical surface at the upper end, which matches the inclined surface on the retaining ring (4). The hanger (1) is seated in the body (3) through the retaining ring (4); Both the hanger (11) and hanger (1) are designed with steps, and the couplings of the technical casing and the oil reservoir casing sit on the steps inside the hanger (11) and hanger (1), respectively. This utility model realizes controlled cementing with a blowout preventer, ensuring construction safety; And can carry out cement squeezing operations when needed; Eliminating the hidden danger of hot work at the wellhead caused by fixing the casing with traditional welding methods, and improving reliability; The casing suspension can be directly operated on the drill floor, simplifying the procedures for wellhead operations and reducing the intensity of installation operations.