西南石油大学学报(自然科学版) ›› 2012, Vol. 34 ›› Issue (6): 153-160.

• 石油机械工程及其他 • Previous Articles     Next Articles

Research of Auto-drilling Technology Based on Parameters’ Self-adjustingFuzzy Control

Guo Fuqin1, Hua Pengtao2   

  1. 1. Department of Maritime Engineering，Yan’an Vocational and Technical College，Yan’an，Shaanxi 716000，China2. Electronic Information College，Xi’an Polytechnic University，Xi’an，Shaanxi 710048，China
  • Received:1900-01-01 Revised:1900-01-01 Online:2012-12-01 Published:2012-12-01

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Abstract: Due to the defects of the traditional drilling method，as well as the complexity of the drilling process and difficult
in establishing mathematical model，etc，this paper briefly analyzes the principle of auto-drilling system on AC frequency conversion
and the relationship among all factors affecting auto-drilling and puts forward a technology that combines parameters’
self-tuning fuzzy control with constant WOB（Weight On Bit）auto-drilling technology on AC frequency conversion. Based
on the judgement of drilling pressure trend，the application of parameters’ self-tuning fuzzy control leads to the control of the
rig’s speed. The algorithm does not need accurate mathematical model and can learn to fix control parameters in real time by
itself. The test shows that the control system has good performance and high precision，ensuring constant WOB and stable
speed in auto-drilling，and thus improving the rapidity，adaptability and robustness of system. The field applications prove that
this algorithm control effect is superior，with the steady-state accuracy within ±0.5 t. The control algorithm can also be used in
other auto-drilling systems.

Key words: conversion rig, constant WOB, auto-drilling, parameters’ self-adjusting, fuzzy control