1. Overview
This project always focuses on the core issue of "NGH drilling process simulation", and designs and develops a bottom-hole NGH drilling simulation experimental instrument for the submarine NGH reservoir with a water depth of 0~2500 meters in the South China Sea and the permafrost NGH reservoir with a buried depth of 0~300 meters in the permafrost zone of the Qinghai-Tibet Plateau, so that it can truly simulate the NGH accumulation environment in the South China Sea and the Qinghai-Tibet Plateau, and realize the NGH drilling simulation experimental study. Through in-situ, real-time, fast and accurate measurement and characterization of parameters such as hydrate reservoir and bottom hole temperature, pressure, conductivity, ultrasonic propagation and borehole mechanical properties during drilling, the basic scientific problems such as NGH reservoir preparation, hot pressing characteristics of hydrate-containing formation during drilling, hydrate phase change, precise temperature and pressure control drilling, drilling fluid and borehole stability evaluation are solved. The main contents of the instrument development include: three types of pressure vessel equipment under complex conditions such as high pressure and low temperature, precise temperature and pressure control drilling experimental system, design, manufacturing and debugging technology of drilling bottom temperature and pressure testing equipment, parameter testing, data acquisition, processing, analysis and testing software development, database establishment and maintenance, etc.

2. drilling system parameters

Environmental system parameters