No. 717 Research Institute of China Shipbuilding Industry Corporation

Changjing River Scientific Research Institute

Bin Wang

Fusheng Chen

Haicen Mao

Kangqi Liu

Jun Cheng

Xiuli Ding

Ping Fu

Sheng Luo

Chen Huang

Xiaoyu Han

Chunhua Zhou

Yuankun Liu

Xinhui Zhang

Liming Zhou

Jiapeng Zhou

Kai Ai

Zhihong Dong

Heng Zhang

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The device greatly reduces wear of the in-hole equipment and the hole wall when the in-hole equipment is installed and withdrawn, can effectively protect markings of an impression measurement, and is suitable for high-efficiency in-situ stress measurement by a hydraulic fracturing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

The present application discloses a control method for fast trapping and high-frequency mutual ejection of cold atom groups. The control method includes: arranging three groups of optical stops on three groups of light sources (splitters) in three-dimensional magneto-optical traps, to form a shaded regions; ejecting a cold atom group from the first three-dimensional magneto-optical trap along a movement trajectory to the second three-dimensional magneto-optical trap, where the movement trajectory passes through the shaded regions of the two three-dimensional magneto-optical traps; and, when it is determined that the cold atom group enters the shaded region of the first three-dimensional magneto-optical trap, trapping a next cold atom group by turning on three-dimensional cooling light and three-dimensional repumping light in the first three-dimensional magneto-optical trap.

Control method for fast trapping and high-frequency mutual ejection of cold atom groups

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Wuhan, China

Bin Wang