Title:
TEETH-EMBEDDED MOTION-STOP FORWARD/REVERSE ROTATION DRILL PIPE
Document Type and Number:
WIPO Patent Application WO/2022/121237
Kind Code:
A1
Abstract:
Provided is a teeth-embedded motion-stop forward/reverse rotation drill pipe, comprising a pipe body (2); the front end of the pipe body (2) is provided with a male joint (3); the rear end is provided with a female joint (1) which can be threaded into the male joint (3); the pipe body (2), the male joint (3), and the female joint (1) all are hollow structures to form an axially interpenetrating central bore; the central bore is provided with a drive rod (6) slidingly connected thereto; the front end of the drive rod (6) is provided with a drive pin passing through a slide groove (306) disposed on the male joint (3) and connected to a slide sleeve (5) sleeved on the male joint (3); the front end of the slide sleeve (5) has a plurality of tooth embedding teeth which can be fitted with the rear end of the female connector (1) and used for circumferential locking, comprising a long tooth and a plurality of short teeth; the length of engagement of the long tooth is longer by h than the length of engagement of the short teeth, h being less than the pitch p of the male connector (3) fitted with the female connector (1).
Inventors:
XIN DEZHONG (CN)
CHEN HANG (CN)
WAN JUN (CN)
PU JIAN (CN)
WANG QINGFENG (CN)
TANG MIN (CN)
LYU JINJUN (CN)
LIU XIAOHUA (CN)
YANG LIN (CN)
ZHANG SHIZHAI (CN)
MA ZHENGANG (CN)
LEI WANNIAN (CN)
WAN YUAN (CN)
MEI ANPING (CN)
ZHOU FUJIA (CN)
QIN YI (CN)
LI SHUJIAN (CN)
CHEN HANG (CN)
WAN JUN (CN)
PU JIAN (CN)
WANG QINGFENG (CN)
TANG MIN (CN)
LYU JINJUN (CN)
LIU XIAOHUA (CN)
YANG LIN (CN)
ZHANG SHIZHAI (CN)
MA ZHENGANG (CN)
LEI WANNIAN (CN)
WAN YUAN (CN)
MEI ANPING (CN)
ZHOU FUJIA (CN)
QIN YI (CN)
LI SHUJIAN (CN)
Application Number:
PCT/CN2021/094347
Publication Date:
June 16, 2022
Filing Date:
May 18, 2021
Export Citation:
Assignee:
CHINA COAL TECH & ENGINEERING GROUP CHONGQING RESEARCH INSTITUTE CO LTD (CN)
International Classes:
E21B17/00; E21B17/042; E21B17/043; E21B17/046
Domestic Patent References:
| WO2000025029A1 | 2000-05-04 |
Foreign References:
| CN112664147A | 2021-04-16 | |||
| CN107178319A | 2017-09-19 | |||
| CN110374521A | 2019-10-25 |
Attorney, Agent or Firm:
TIDYTEND INTELLECTUAL PROPERTY LAW FIRM (CN)
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