Changjing River Scientific Research Institute

Zhihong Dong

Ping Fu

Bin Wang

Xiuli Ding

Heng Zhang

Kai Ai

Xiaoyu Han

Xinhui Zhang

Chunhua Zhou

Sheng Luo

Yuankun Liu

Liming Zhou

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The device greatly reduces wear of the in-hole equipment and the hole wall when the in-hole equipment is installed and withdrawn, can effectively protect markings of an impression measurement, and is suitable for high-efficiency in-situ stress measurement by a hydraulic fracturing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

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

Growing community of inventors

Wuhan, China

Zhihong Dong