Research and progress of Intelligent Drilling Technology System and related theories

To meet the national strategic demand for efficient and low-cost development of deep/ultra-deep oil and gas resources (depth between 4500 similar to 9000 m), it is urgent to establish the geological theories of Chinese deep/ultra-deep oil and gas resources and develop the intelligent drilling technology system for supporting deep/ultra-deep hydrocarbon exploration and development. Targeting at deep/ultra-deep hydrocarbon, supported by the "Research on Intelligent Drilling Technology and Equipment System and Related Theories" (called Intelligent Drilling System project for short) of the Class A Strategic Priority Program from the Chinese Academy of Sciences, researches on hydrocarbon accumulation theory, rotary steering and geosteering drilling technology, remote decision-making system and equipment test platform have been systematically conducted. Given that the high-temperature, high-pressure, and hydrogenation of water can significantly increase the potential of oil and gas resources at deep/ultra-deep formations, a theory is proposed, assuming "Initial foundation, late-stage transformation, deep burial retention" as the primary controlling factors for multi-type large-scale high-quality reservoirs and multi-stage hydrocarbon accumulation and transformation as the controlling factors for the differences in the type and distribution patterns of deep/ultra-deep oil and gas reservoirs. Based on the four subsystems of intelligent guide drilling technology system, which include rotary steering drilling equipment system (Drilling), geosteering logging while drilling (Measurement), high-speed transmission (Transmission), and ground control (Control), several breakthroughs have been achieved, including rotary steering high-precision dynamic measurement and control, non-contact high-efficiency power and signal transmission, full symmetric anti-jamming antenna system for azimuth electromagnetic wave logging while drilling, design and packaging of high-temperature and high-pressure instruments, high-precision servo control of nonlinear fluid load in borehole data transmission, weak signal extraction through strong distortion channel, etc. More than 10 downhole instruments, such as rotary steering system, geosteering and borehole transmission, have been developed, realizing the integrated assembly of the integrated intelligent drilling guide system of "Drilling-Measurement-Transmission-Control". The field drilling joint commissioning tests are currently in progress, attempting to develop intelligent drilling equipment with independent intellectual property rights in the whole chain of "theoretical research-technology research-equipment manufacturing-field application", for the purpose of providing theoretical and technical supports for Chinese national energy security.