Title:
UNDERGROUND DRIVING DEVICE AND METHOD FOR SMALL-DIAMETER DRILL STRING
Document Type and Number:
WIPO Patent Application WO/2024/017272
Kind Code:
A1
Abstract:
Disclosed are an underground driving device and method for a small-diameter drill string. The device comprises a sidetracking string, a guide structure, and a driving string; the guide structure is connected below the driving string and enters a well together, and the sidetracking string enters the stratum from the interiors of the guide structure and the driving string; a power device is arranged at the bottom of the driving string, a transmission device is arranged between the power device and the sidetracking string, and the power device can provide rotating power for the sidetracking string or achieve angle position control by means of the transmission device; the power device surrounds and is sleeved on the outer side of the sidetracking string. The present invention proposes the design concept of an underground rotary table, achieves the underground driving of a small-diameter drill string, and solves the problems of the inability to effectively transmit rotating power and the backing pressure in micro-hole drilling, so that the extension capability of micro-hole lateral drilling can be greatly improved.
Inventors:
WAN XIAOYUE (CN)
XU ZICHEN (CN)
YANG ZHONGHUA (CN)
XU ZICHEN (CN)
YANG ZHONGHUA (CN)
Application Number:
PCT/CN2023/108028
Publication Date:
January 25, 2024
Filing Date:
July 19, 2023
Export Citation:
Assignee:
WAN XIAOYUE (CN)
International Classes:
E21B17/05; E21B7/04; E21B17/20
Foreign References:
| US6446737B1 | 2002-09-10 | |||
| CN113153151A | 2021-07-23 | |||
| CN114109249A | 2022-03-01 | |||
| US20090127000A1 | 2009-05-21 | |||
| CN105569569A | 2016-05-11 | |||
| CN113047772A | 2021-06-29 |
Attorney, Agent or Firm:
SUZHOU TUOHONG INTELLECTUAL PROPERTY AGENCY CO., LTD. (CN)
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