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Abstract
Information transmission is an important part of the wellbore trajectory automatic control system. Combined with the characteristics of the guided drilling system, drilling fluid pulse is selected as a tool for trajectory control. Negative pulse transmission of drilling fluid is one of the key technologies to realize wellbore trajectory automatic control. In this paper, the working principle of negative pulse propagation of drilling fluid is introduced. The characteristics of negative pulse propagation and signal pretreatment of drilling fluid are analyzed emphatically. Signal correlation analysis method is proposed for signal transmission of drilling fluid negative impulse well. In this paper, the propagation characteristics of drilling fluid pressure pulsed downward transmission system are studied deeply. The influence of various drilling parameters on the drilling fluid pressure pulse is analyzed, and the model of drilling fluid pressure pulse is presented. Experimental results show that the proposed method can effectively separate useful signals from interfering signals. It is verified by field experiment that the success rate of information decode system designed by this method is high, which can meet the requirement of well trajectory precise control.
Highlights
Wellbore trajectory control closed-loop drilling technology is the late 20th century developed advanced automated drilling technology
The ground and underground information transmission channel formed by the coding transmitter and the decoder is an important part of closed-loop well trajectory control drilling research
The transmission speed of drilling fluid pulse signal is an important point in the transmission characteristics of drilling fluid pulse signal, which is of great significance to the design of drilling guidance parameter transmission system, drilling fluid pulse signal transmission speed and drilling fluid temperature, drilling fluid composition and pulse pressure, and drilling fluid solid content and gas content, drill string diameter, and other factors
Summary
Wellbore trajectory control closed-loop drilling technology is the late 20th century developed advanced automated drilling technology. When the bypass valve was opened and closed at work, a series of pressure pulse signals which could be received and decoded by the underground receiver could be generated This method reduced the time spent in the downlink channel transmission without interrupting the drilling. Patent US2006225920 in the downlink channel system is the use of mud flow rate changes, sending ground command signal into the down hole control drilling tool combination. The ground and underground information transmission channel formed by the coding transmitter and the decoder is an important part of closed-loop well trajectory control drilling research
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