WELLHEAD TREE EQUIPMENT Russian patent published in 2019 - IPC F16K3/00 E21B34/02 

FIELD: valve production.

SUBSTANCE: invention relates to a controlled locking valve. Wellhead tree equipment comprises a column head with several casing columns suspended thereon, forming an inter-column space between them, wherein the space being controlled by locking devices, and a christmas tree with a root and buffer locking devices, and the outer casing is connected to the casing of the column head by means of a threaded connection, wherein the intermediate casing and the inner casing, each by its standard wedge suspension, are suspended on its nozzle, wherein the nozzle of the intermediate casing is provided at an upper end with a collar resting on a protrusion in the casing of the column head, nozzle of the inner casing is supported by the collar formed in its upper part on the collar of the nozzle of the intermediate casing pipe through a ring with at least one hole formed in its wall, placed in the annular space, communicated with the middle lateral branch of the column head, wherein the space between each nozzle and the casing suspended therein at the interface thereof is sealed by means of a seal, on the inner casing above the wedge hanger, there is a mounted removable oil well tubing (OWT) hanger packing unit on which the whole stem part of the christmas tree is mounted, including a root locking device provided with a ball valve, and a crosspiece with a central channel and side branches, wherein the central channel of the crosspiece being connected to the buffer locking device provided with a ball valve, and its lateral branches are communicated through the annular space with the lateral branch of the christmas tree installed in a flange located on the column head, wherein OWT hanger packing unit is provided with check valves, which are opened under the action of the lower end part of the stem part of the christmas tree, contacting the end face of the body of the removable OWT hanger packing unit, and the upper part of the stem part of the christmas tree is detachably connected to the flange mounted on the body of the column head, inside the body of the removable OWT hanger packing unit, a threaded area is provided for the installation of a plug configured to overlap the OWT when replacing the stem part of the christmas tree without damping the well, drives of the root and buffer locking devices are configured with a lever-piston hydraulic drive controlled by a hydraulic pump mounted on the flange above the column head and equipped with a check valve, wherein the latter and the lever-piston actuator being automatically and remotely controlled, the lower seats of each locking device with the ball valve are spring-loaded by a coiled spring, wherein the spring of the buffer locking device being supported by the crosspiece body, and the stem part of the christmas tree, comprising the root and buffer locking devices and the crosspiece, forms a single detachable unit, the crosspiece of which is connected to the nozzle, the upper end of which is connected to the plug of the flange mounted on the column head.

EFFECT: as a result, the reduced height and metal capacity of the christmas tree are achieved, while providing the possibility of replacing the stem part of the christmas tree without damping the well.

1 cl, 2 dwg