Development and Application of Hydraulic Drilling Rig for Marine Geological Survey

To address the problems of existing drilling system like large mass, low mechanical drive efficiency and large space requirement, a hydraulic drilling system for marine geological survey is developed. The system uses an integrated hydraulic system to power its hoisting system, pipe handling system, subsea template deploying and control system. The gate type derrick, cylinder type drill pipe lifting system, elevation type hydraulic and pneumatic power tong and double driller integrated control system are used to meet the needs of fixed-point operations in ±1.5 m surge sea conditions. The system has been used 6 times with the Guangzhou Marine Geology Survey Ship No. 10, and has completed a drilling footage of about 1 000 m. The depth of the shallow sea bottom sampling core is up to 100 m. The average net time of drill pipe make-up and drilling operation is about 8 h/200 m. The working efficiency is increased by about 25% compared with the conventional drilling platform. The number of staffs is reduced from 7 to 3. The drilling rig reduces the on-site labor intensity and also significantly improves the sampling completion rate. The study results can provide references for the design of similar hydraulic geological drilling systems, and lay a foundation for subsequent geological survey and scientific research.