Title:
WELLHEAD SEALING DEVICE OF SUCKER-ROD PUMPING MACHINE
Document Type and Number:
WIPO Patent Application WO/2017/117837
Kind Code:
A1
Abstract:
Disclosed is a wellhead sealing device of a sucker-rod pumping machine, the wellhead sealing device including a flexible connecting unit, and further including an anti-spray unit, a shut-off unit, a righting correction unit and a lubrication unit. The flexible connecting unit is arranged between a wellhead and a packing box, and comprises a lower flexible sealing sleeve (37), a lower flexible sealing sleeve shell (12), a sealing steel ring (11), and an upper flexible sealing sleeve (10). The entire upper portion of the flexible connecting unit swings with a polished rod (7) constantly, such that a packing (9) is dynamically coaxial with the polished rod (7) and the problem of packing eccentric wear can be completely solved. Furthermore, the device can also solve the static coaxial and lubrication problems between the polished rod (7) and the packing (9), as well as the anti-spray problem when the polished rod (7) is broken off.
Inventors:
YU LICHENG (CN)
SI KAO (CN)
SI KAO (CN)
Application Number:
PCT/CN2016/072838
Publication Date:
July 13, 2017
Filing Date:
January 29, 2016
Export Citation:
Assignee:
YU LICHENG (CN)
SI KAO (CN)
SI KAO (CN)
International Classes:
E21B33/06; E21B33/03; F16N11/04
Foreign References:
| CN205349277U | 2016-06-29 | |||
| CN204040980U | 2014-12-24 | |||
| CN103628838A | 2014-03-12 | |||
| CN204532224U | 2015-08-05 | |||
| CN101608537A | 2009-12-23 | |||
| CN201778723U | 2011-03-30 | |||
| CN101205801A | 2008-06-25 | |||
| US3887196A | 1975-06-03 | |||
| CN204175227U | 2015-02-25 |
Attorney, Agent or Firm:
BEIJING JINZHIPUHUA INTELLECTUAL PROPERTY AGENCY CO. LTD (CN)
Download PDF: