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Patent Searching and Data


Title:
WELLHEAD POLISHED ROD SEALING DEVICE FOR PUMPING UNIT
Document Type and Number:
WIPO Patent Application WO/2020/113745
Kind Code:
A1
Abstract:
A wellhead polished rod sealing device for a pumping unit, comprising an upper stuffing box (6) and a lower stuffing box (3) which are sleeved on a polished rod (13) and are screwed to each other. A space between the upper stuffing box (6) and the polished rod (13) and a space between the lower stuffing box (3) and the polished rod (13) are filled with an upper packing (7) and a lower packing (5) respectively. A pressing cover (8) elastically presses against a top part of the upper packing (7). An upper part of a connecting joint (1) is sleeved in the space between the lower stuffing box (3) and the polished rod (13), and forms an abutment with a lower end of the lower packing (5). An inner side of an upper end of a fixing cap (2) forms a screw connection with an outer side of a lower end of the lower stuffing box (3), and a lower end is fixedly connected to a lower part of the connecting joint (1). The present sealing device may simultaneously solve the problems in which the wellhead polished rod (13) of the pumping unit is abraded, the polished rod (13) has a short service life, and the upper packing (7) needing to be vented when replaced.

Inventors:
WANG GAOSONG (CN)
WANG QIONG (CN)
Application Number:
CN2019/000228
Publication Date:
June 11, 2020
Filing Date:
November 27, 2019
Export Citation:
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Assignee:
WANG GAOSONG (CN)
WANG QIONG (CN)
International Classes:
E21B33/06; E21B33/03
Foreign References:
CN105443069A2016-03-30
CN202000946U2011-10-05
CN101725329A2010-06-09
CN201915886U2011-08-03
CN101514616A2009-08-26
US3508759A1970-04-28
Attorney, Agent or Firm:
KELONG INTERNATIONAL INTELLECTUAL PROPERTY AGENT LTD. (CN)
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