FIELD: oil production industry, particularly wellhead equipment, namely that adapted to seal wellheads of long wells during well rod pumping and to run off produced well liquid into outlet pipeline of oil-field gathering system.
SUBSTANCE: casing-head stuffing box comprises ball connection tightened with dogbolts, supplementary sealing collars, sealing collar carrying means and a set of upper split sealing collars. Dogbolts are used as sealing collar carrying means. Upper conical sealing collars are installed in sealing cup into which threaded bush is screwed. Two guiding bushes are installed in the threaded bush. Supplementary sealing collars are arranged between guiding bushes. Sealing ring and ball connection made as T-shaped means with closure are installed in lower part of tightened ball connection. Threaded bush is screwed into check valve by lower end thereof, check valve is screwed into ball connection, wherein sealing collar carrying means are dogbolts.
EFFECT: simplified structure and increased reliability due to provision of quick sealing member replacement without rod hanger disassembling.
2 dwg
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