In-situ stress measurement device and method for ultra-deep non-vertical drilling

US12264582B2 · kind B2 · utility

Assignee

• Changjiang River Scientific Research Institute · CN

Inventors

• Xiaoyu HAN · Lo Wu, CN
• Zhihong Dong · Nantong, CN
• Xiuli Ding · 红钢城街道, CN
• Ping Fu · 红钢城街道, CN
• Liming Zhou · Lake Hiawatha, US
• Xinhui Zhang · 红钢城街道, CN
• Bin Wang · Beijing, CN
• Yuankun LIU · 红钢城街道, CN
• Sheng Luo · 红钢城街道, CN
• Chunhua Zhou · Suzhou, CN
• Kai Ai · 红钢城街道, CN
• Heng Zhang · Zhangdian District, CN

Key dates

• Filing date: Jun 5, 2024
• Grant date: Apr 1, 2025
• Expiry date: Jun 5, 2044

Classification

• Technology area (CPC Y): Emerging Cross-Sectional Technologies
• CPC primary: Y02E10/10
• WIPO field: Civil engineering
• WIPO sector: Other fields

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The device greatly reduces wear of the in-hole equipment and the hole wall when the in-hole equipment is installed and withdrawn, can effectively protect markings of an impression measurement, and is suitable for high-efficiency in-situ stress measurement by a hydraulic fracturing method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.