Huazhong University of Science and Technology

Changjing River Scientific Research Institute

Ping Fu

Weidong Yang

Wei Zhang

Hao Li

Tianxu Zhang

Xiangyan Liu

Bin Wang

Xiuli Ding

Gaofei Li

Heng Zhang

Xinhui Zhang

Sheng Luo

Xiaoyu Han

Zhihong Dong

Xiaoyong Bian

Chunhua Zhou

Yuankun Liu

Liming Zhou

Zheng Fang

Kai Ai

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The device greatly reduces wear of the in-hole equipment and the hole wall when the in-hole equipment is installed and withdrawn, can effectively protect markings of an impression measurement, and is suitable for high-efficiency in-situ stress measurement by a hydraulic fracturing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

A method for detecting spectral characteristics of multi-band moving objects. The method includes: 1) dividing a full field of view into several subfields of view, and scanning and extracting suspected objects in each subfield one by one; 2) correlating interrelated suspected objects in adjacent subfields via coordinates to determine objects of interest that exist in the full field of view; 3) calculating the speeds of the objects of interest; 4) calculating average speed of all of the objects of interest and classifying the objects of interest according to their average speed; 5) compensating and rectifying the objective spectrum obtained from calculation; and 6) matching the compensated and rectified objective spectrum with a spectrum fingerprint database whereby realizing recognition of the multi-band moving objects.

Method and apparatus for detecting spectral characteristics of multi-band moving objects

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Wuhan, China

Ping Fu