页岩气低摩阻钻井液研究进展及发展趋势OA

[Objective]Shale gas is an important unconventional natural gas resource in China,boasting significant potential reserves.Deep shale gas reservoirs generally have specific geological characteristics,such as low porosity and permeability,strong abrasiveness,and high temperature and pressure.Technical problems often arise during drilling,such as wellbore instability,friction in the long horizontal section,and large torque.Low-friction drilling fluid technology is key to safe and efficient drilling in deep shale gas reservoirs.[Methods]Based on an investigation of the current state of shale gas exploration and development in the world,this paper analyzes the evaluation index of drilling fluid lubricity and its drag reduction mechanisms,including,among others,lubrication film formation,rolling friction,and wettability regulation.[Results]This paper systematically reviews the lubrication performance and research progress of various low-friction drilling fluid systems,such as water-based and oil-based drilling fluid systems.[Conclusions]It is proposed that,in the future,it will be necessary to continue to strengthen the research and development of new,high-performance drilling fluid lubricants;to promote the intelligent and green transformation of drilling fluid systems;and to facilitate the multi-objective coordination between lubrication and wellbore stability technologies to meet the challenges posed by complex formations.[Significance]This research provides strong technical support for the safe and efficient development of global shale gas,for enhancing the productivity of deep oil and gas reserves.