Study Of Down Hole Auto-deviation Control System Based On Single-chip Microprocessor

The work in this paper is a part of the research work"Theory and Technology of the Automatic Vertical Well Drilling Tool of The Liquid Controlling Guide (No. 5074074)"which is funded by the National Natural Science Foundation of China (NSFC) and the research work " The Close Controlling Theory and Technical Research of Down Hole Electromechanical Liquid System of Vertical Well Drilling (2004ABA002) " which is funded by the National Natural Science Foundation of Hubei. It is mainly about the controlling and realizing of the hydraulic guide auto-deviation device of auto vertical drilling tool in deep well。The paper has discussed the existing status and progress in terms of automatic vertical drilling technologies and tool development in both home and abroad in detail , puts forward the minute inclination survey principles based on real-time control pointed to the structural characteristics of the vertical drilling model machines developed by drilling control lab in our college and practical operation condition and process requirements to vertical drilling , and then proved that there exits remarkable advantages when we take X and Y axis as gaging spindle instead of Z axis. The paper has also probed into the designs of down hole closed-loop auto-deviation controlling systems ,whose core is single-chip microcomputers , brought forward real-time controlling strategies and cotrolling algorithms based upon single-chip microcomputers ,ananyzed many particular problem existing in down hole real-time controlling conditions such as viberations , high temperatures ,noises, narrow spaces ,limited controlling energies and unavailable manual interventions ,and done much significant research in hardware and software designs in single-chip microcomputer controlling systems in view of the issues above. Finally ,the paper has made specific introduction to the general hardware layouts in single-chip microcomputer systerms and sampling , series communication,display and output circuits, and made necessary statements to relevant software realizations as well。A real-time controlling experiment has been put on the simulation drilling tools in door by means of the single-chip microprocessor of the design, and then it has been indicated that the control precision of the simulation inclination angle by using the controller of the design could be up to 0.1°on non-vibration condition, and that effective control to the simulation inclination angle no less than 0.25°could be realized with the same controller on vibration condition。...