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In the drilling process , in many cases still rely on manual operation, controlled by an experienced driller . Due to prolonged operation , drilling mental and physical consumption , accidents inevitably occur left to drill or drill string , bring hidden dangers , and control the amount of feed is intermittent , bit feed quality varies from person to person, it will affect the quality of drilling , accident prone borehole deviation and sticking . Facing these problems in the process of drilling control study intelligent fuzzy control technology and its application in automatic feed drilling system , to promote drilling automation, reduce drilling costs , and improve the quality of drilling has certain theoretical significance and practical value . In this paper, the characteristics of the work of the rig , completed the design of constant drilling pressure control scheme based on fuzzy control computer , the program uses a dual-loop control structure , internal speed encoder signal feedback form local negative feedback loop , external WOB measurement signal feedback constitute the second negative feedback loop. Accurate mathematical model of the actual system is difficult to obtain in this issue , we in outer control algorithm using the idea of fuzzy control , broke through the limitations of conventional PID control . And Visual C programming environment designed and implemented a practical monitoring software . Its features include constant drilling pressure control algorithm and the specific algorithms downhole signal read and display filtering, encoding / decoding, signal interpretation , display of various parameters .
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