FIELD: oil and gas industry.
SUBSTANCE: invention relates to oil producing equipment, in particular to wellhead seal, and can be used to seal stem of a sucker rod pump. Wellhead sealing contains a body, an upper working and lower reserve sealing units with sealing elements and pressure rings, a lubrication chamber between sealing units equipped with back pressure valve, a lid with abutment having ability to cooperate with the pressure ring of the upper sealing unit. Sealing units comprise a body made in form of a glass with a central axial hole with sealing elements and a pressure ring therein. Lower sealing unit is made with the possibility of limited axial movement between the body support and the upper sealing unit to form a chamber of variable volume. Back pressure valve is installed at the output of radial hole made at the top of the chamber.
EFFECT: use of this device ensures exclusion of oil leaks in violation of tightness of the working sealing unit, as well as the simplification of installation and dismantling of sealing units.
3 cl, 1 dwg
| Title | Year | Author | Number |
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RU2224086C1 |
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| CASING-HEAD STUFFING BOX | 1996 |
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| WELLHEAD SEALING DEVICE | 1997 |
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| PIPE SEALING UNIT FOR DIE PREVENTER | 2001 |
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| AXIAL BLOWOUT-PREVENTION WELLHEAD STUFFING BOX | 2013 |
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RU2573887C2 |
