The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Apr. 01, 2025
Filed:
Jun. 05, 2024
Changjing River Scientific Research Institute, Wuhan, CN;
Xiaoyu Han, Wuhan, CN;
Zhihong Dong, Wuhan, CN;
Xiuli Ding, Wuhan, CN;
Ping Fu, Wuhan, CN;
Liming Zhou, Wuhan, CN;
Xinhui Zhang, Wuhan, CN;
Bin Wang, Wuhan, CN;
Yuankun Liu, Wuhan, CN;
Sheng Luo, Wuhan, CN;
Chunhua Zhou, Wuhan, CN;
Kai Ai, Wuhan, CN;
Heng Zhang, Xiantao, CN;
Changjing River Scientific Research Institute, Wuhan, CN;
Abstract
An in-situ stress measurement device for ultra-deep non-vertical drilling adopts a technical route of single channel and bidirectional rolling of in-hole equipment, and its related functions are mainly realized by a bidirectional rolling device and a split-type axial-force-free circuit switching valve. The bidirectional rolling device can drive the in-hole equipment to move freely in a circumferential direction and back and forth, which changes sliding friction between the in-hole equipment and a hole wall into rolling friction during an in-situ stress measurement of non-vertical drilling. The split-type axial-force-free circuit switching valve provides a technical solution for a single-pipe test in the non-vertical drilling. The device greatly reduces wear of the in-hole equipment and the hole wall when the in-hole equipment is installed and withdrawn, can effectively protect markings of an impression measurement, and is suitable for high-efficiency in-situ stress measurement by a hydraulic fracturing method in the non-vertical ultra-deep drilling.