Basic research progress and prospect in deep and ultra-deep directional drilling
Deep and ultra-deep directional drilling has the dual characteristics of"large vertical depth and far horizontal extension"and is constrained by multiple factors such as complex strata,high temperature,high pressure,and ultra-long open hole,which bring greater all-round technical challenges to the safety and efficiency of deep and ultra-deep directional drilling.Focusing on improving the rate of penetration(ROP)and efficiency of directional drilling in deep and ultra-deep strata,this paper systematically summarizes the development situations and technical characteristics of directional drilling,and selects several important in mechanics in deep and ultra-deep directional drilling.Then,the relevant research progress and the latest research achievements of domestic and foreign experts and scholars are analyzed.Finally,the development trend of basic theoretical research on deep and ultra-deep directional drilling is predicted,and some suggestions are made.And the following research results are obtained.First,the large-small deviation fusion control algorithm considers multi-objective constraints such as control accuracy and well trajectory smoothness,so it is applicable toe real-time well trajectory control in deep and ultra-deep strata.Second,properly optimizing the number,placements and excitation force amplitudes of vibration drag reduction tools can significantly reduce pipe string friction and effectively increase ROP.Third,the ROP fusion prediction model based on the error compensation mechanism not only retains the interpretability of the mechanism model,but also has a high prediction accuracy.Fourth,the prediction model of compound casing wear breaks the limitations of the classic"single crescent"mode,and achieves the simultaneous prediction of casing wear shape and depth under the compound mode.In conclusion,deep and ultra-deep directional and horizontal wells are one of the important development directions of engineering in the future.It is recommended to strengthen the researches on multi-factor coupling mechanism,drilling extension limit and mechanism-data fusion drive,so as to promote the innovation and development of basic theories in complex oil and gas drilling engineering and provide neressary basic support for technical progress of deep and ultra-deep drilling engineering.
Deep and ultra-deep strataOil and gas engineeringDirectional drillingDrilling mechanicsBasic researchDrilling extension limit,Design and control
万方数据
维普
