WELL HEAD SEALING DEVICE Russian patent published in 2005 - IPC

FIELD: oil industry, particularly to operate oil and gas wells working under pressure.

SUBSTANCE: device has body rigidly secured to hydraulic cylinder and hollow piston arranged in the hydraulic cylinder. Arranged in the body are sealing member, upper and lower guiding rings installed correspondingly above and under the sealing member, and rest cooperating with upper guiding ring. Above components are removable. Lower guiding ring cooperates with hollow piston. Body is composed of upper and lower parts connected one to another by adjusting thread. The device also has additional sealing member, upper and lower guiding rings installed correspondingly above and under additional sealing member and additional rest cooperating with additional upper guiding ring. Above members are split and arranged in upper body part. Upper part is provided with adjusting screw located from top thereof and with stop for additional lower ring rest. Adjusting screw cooperates with additional rest. Lower end of upper body part cooperates with the rest. Hollow piston may be displaced only within hydraulic cylinder dimensions. Head-end cavity of the hydraulic cylinder communicates with ambient space. Lower guiding ring has fishing tool to fix equipment lowered in the well in upper extreme position thereof. Sealing members may include a set of sealing rings.

EFFECT: reduced consumption of materials used for device maintenance, increased sealing quality, elimination of emergency situations during equipment lifting.

2 cl, 2 dwg