Zhihong Dong

Title: Zhihong Dong and an In-Situ Stress Measurement Invention

Introduction

Zhihong Dong is an inventor associated with Wuhan, China, and Changjing River Scientific Research Institute. His work includes an invention designed to improve in-situ stress measurement in ultra-deep, non-vertical drilling.

Latest Patents

Dong is associated with 1 patent: “In-Situ Stress Measurement Device and Method for Ultra-Deep Non-Vertical Drilling.” The invention uses a single-channel approach and bidirectional rolling equipment. Its rolling device allows downhole equipment to move circumferentially and back and forth, replacing sliding friction against the borehole wall with rolling friction during measurement.

The device also incorporates a split-type, axial-force-free circuit switching valve, which supports single-pipe testing in non-vertical drilling. Together, these features reduce wear on the equipment and borehole wall during installation and withdrawal, help protect impression-measurement markings, and support hydraulic-fracturing-based stress measurement in ultra-deep, non-vertical wells.

Career Highlights

Dong’s patent addresses practical challenges in downhole measurement, including equipment movement, friction, and the preservation of measurement marks. The design is intended to make in-situ stress testing more efficient in demanding drilling conditions.

Collaborations

Dong’s listed coworkers include Xiaoyu Han and Bin Wang. He is associated with Changjing River Scientific Research Institute.

Conclusion

Zhihong Dong’s patented device combines bidirectional rolling with a specialized switching valve to reduce wear and support efficient in-situ stress measurement in ultra-deep, non-vertical drilling.