Title:
PETROLEUM FLEXIBLE DRILL PIPE
Document Type and Number:
WIPO Patent Application WO/2019/079945
Kind Code:
A1
Abstract:
A petroleum flexible drill pipe, comprising: an upper drill pipe (1) and a lower drill pipe (2); an upper connection flange (3) is disposed on a lower end of the upper drill pipe (1), and a lower connection flange (4) is disposed on an upper end of the lower drill pipe (2), a buffer gap (5) being provided between the upper connection flange (3) and the lower connection flange (4); multiple upper semi-spherical slots (6) are evenly arranged at a lower end of the upper connection flange (3), and upper connection bolt holes (7), which communicate with the upper semi-spherical slots (6), are penetratingly provided within the upper connection flange (3) at upper ends of the upper semi-spherical slots (6); multiple lower semi-spherical slots (8), which cooperate with the upper semi-spherical slots (6), are evenly arranged at the upper end of the lower connection flange (4), lower connection bolt holes (9), which communicate with the lower semi-spherical slots (8), being penetratingly provided within the lower connection flange (4) at the lower ends of the lower semi-spherical slots (8); a sphere (10) is rotatingly provided between the upper semi-spherical slots (6) and the lower semi-spherical slots (8), and upper connection bolts (11) are penetratingly provided within the upper connection bolt holes (7) at an upper end of the sphere (10).
Inventors:
HUA JINNIAN (CN)
Application Number:
PCT/CN2017/107357
Publication Date:
May 02, 2019
Filing Date:
October 23, 2017
Export Citation:
Assignee:
YANCHENG JINRUI PETROLEUM MACHINERY CO LTD (CN)
International Classes:
E21B17/20; E21B17/02
Foreign References:
| CN106368622A | 2017-02-01 | |||
| CN2720083Y | 2005-08-24 | |||
| CN206429198U | 2017-08-22 | |||
| CN204691699U | 2015-10-07 | |||
| CN102425385A | 2012-04-25 | |||
| CN205063853U | 2016-03-02 | |||
| EP0512638A1 | 1992-11-11 |
Attorney, Agent or Firm:
BEIJING LINKAW PATENT ATTORNEY LAW FIRM (CN)
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