钻井液正脉冲信号的衰减分析

ANALYSIS OF SIGNAL ATTENUATION FOR POSITIVE DRILLING FLUID PULSE

地面与井下的信息传输是井眼轨迹监测与控制的重要环节。目前 ,大多数的无线随钻测量系统都采用钻井液脉冲的传输方式 ,而如何提高传输深度和传输速率一直都是钻井液脉冲传输系统的研究主题。文中根据钻井液脉冲传输的静、动态理论模型 ,研究了正脉冲信号衰减规律。结果表明 ,脉冲信号在井眼中的往复传播类似于阻尼振荡 ,并逐渐衰竭 ;信号频率和钻井液粘度是影响钻井液脉冲信号衰减的主要可控因素。

Information transmission along well bore plays a very important role in measuring and controlling a well trajectory.At present,drilling fluid pulse is widely used by most of wireless MWD systems,and how to improve the transimission depth and rate is a theme of research for this kind of systems.Based on the static and dynamic model theoretically,the attenuation regular pattern of positive pulse signal is discussed in this paper.The results show that the pulse signal of drilling fluid reciprocates along well bore and gradually declines in a similar way of damped oscillation,and the frequency of signals and the viscosity of drilling fluid are the main controllable factors related to the signal attenuation of drilling mud.