Application Research On Compound Drilling Technology In Yitong Area

The characteristics of Yitong area is the deep buried reservoir bed, the bed drillability of target strata, big stratigraphic dip, the high reservoir sensitive and etc. In the process of drilling, it will restrict the drilling speed, on the other hand, it also affects accuracy of the well trajectory. The compound drilling technology of PDC bit and screw drill tool can not only adapt the characteristics of high speed, so that the drill speed greatly improved, and it also can be used to aspects of deviation control, hole straightening, increasing hole angle,steady inclined and etc., and get the objective that achieving precise well trajectory. Therefore,problems in the process of drilling can be solved by applying compound drilling technology,so as to meet the need of oil production.According to research purpose, this paper consists 4 parts. The first part: the research carried out geological condition of Yitong area, and the drilling engineering is affected by geological condition and nature of rock, therefore, this part mainly including basic generalgeology, characteristics of regional size characteristic and rock constituents; The second part: carried out the optimization work of PDC bit and screw drill in Yitong area,including study of optimization and evaluation method of PDC bit and screw drill tool; The third part: carried out study of the precise control technology of well trajectory, due to the difference between hole control technology of the straight well and direction well, therefore,this part separately carried out the trajectory control technology of straight well and direction well; the fourth part: the applicability research on the compound drilling technology in Yitong area.Through this study, optimize the make up of string suitable for Yitong area, it both to improve the drilling speed and solve problem of inaccurate well trajectory control; according to the mechanical properties of rock and drilling data, optimize the PDC bit applied to Yitong area; for the trajectory control technology of straight well, proposed the single bend positive displacement motor used for anti deviation and fast technology; According to the basic principle of wellbore trajectory control in directional wells, combining characteristics of vertical lithology in Yitong area, drilling assembly suitable for all wells section is designed.From the applicability study in Yitong area, the compound drilling technology has achieved significant results and acquired purpose rapid accurate drilling technology.