Research and application of integrated well drilling technology for shale gas exploration in Baojing block, Hunan Province

doi:10.3969/j.issn.1672-7703.2024.06.011

Abstract

Abstract: The geological conditions are complex in Baojing shale gas block, with characteristics of thin reservoir, great burial depth, and high degree of thermal evolution of the Lower Silurian Longmaxi Formation shale. The exploration and development of shale gas are facing great challenges and difficulties, and there is a lack of mature experience to learn from. Therefore, targeting at the goal of speed and efficiency improvement, the exploration mode of “three wells in one” has been applied, and research and practice of integrated well drilling technology have actively been conducted as follows: (1) Well location deployment. On the basis of seismic data inversion, seismic reservoir prediction and gas content detection are conducted. The vertical well is first drilled to obtain reservoir parameters and delineate favorable areas, and then the horizontal well is drilled to evaluate the shale gas production capacity. (2) Geological guidance model establishment. The cross well seismic and logging data are used to establish a geological guidance model before drilling, and then A-B marker bed is used to guide the bit drilling. (3) Implementation of integrated drilling. The upper well section is drilled by downhole screw drill tool to achieve the accurate control of wellbore trajectory. The rotary steering drilling system is applied to drill through the lower well section, and the interactive measurement and control technology is used to monitor the cutting of formation by the drill bit in real time, so as to ensure accurate guidance in the target window. The results show that the integrated well drilling technology enables to improve the drilling rate and accurately obtain formation geological parameters, which is conducive to reservoir evaluation, with a drilling rate of 3.81 m/h and a reservoir penetration rate of 90.68%. The implementation of “three wells in one” exploration mode accelarates the process of shale gas exploration and development. The integrated well drilling technology promotes the shale gas exploration progress in complex structural zone, achieves the low-cost and high-efficiency shale gas development, and provides a reference for shale gas exploration and development in similar areas.

Key words: shale gas, geological engineering, predrilling simulation, geological guidance, horizontal well, effect evaluation

CLC Number:

TE243

Li Bin, Dong Zhenguo, Luo Qun. Research and application of integrated well drilling technology for shale gas exploration in Baojing block, Hunan Province[J]. China Petroleum Exploration, 2024, 29(6): 144-156.

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