基于Simulink的钻井信息传输通道特性仿真

Acoustical properties study within drill strings based on Simulink

为利用钻杆有效地随钻传输地面与井下之间的数据,本文应用声波无缝传输模型将任意钻柱组合分解为单个声波无缝传输模型级联方法,根据某单个典型钻具无缝传输模型系统函数的S参数和声波钻井信道的传输特性,推导了在信道通带内某一频点等效传输函数,在Simulink环境下仿真了该S参数的等效传输函数,并仿真了将双口网络S参数构成单钻具系统函数进行级联构成多个钻具的联接的系统函数。最后根据双口网络参数性质,多钻具级联的系统函数等效为各级T参数的连乘,将S参数转化为T参数,得到多个相同钻杆级联后的模型系统函数特性,仿真结果将对随钻声波传输仪器的方案设计提供有力的技术支持。

For making the drill pipes work effectively with oil rig on the transmission of data between well bottom and the surface, this article analyzes random drill column combination to be single Acoustic seamless transfer of model cascade methods by using acoustic transmission model, According to one typical S-parameter form of drill seamless transfer of model function and the characteristics of Sonic drilling channel ,which analyzes S-parameters of a frequency transfer function inside the Channel pass band, imitating the characteristics of S-parameters under the environment of Simulink along with the multiple drill connected system functions which cascaded by the Single drill system functions constituted by Dual-port network S- parameters. Lastly according to the characteristics of Dual-port network parameters, Multiple drill cascade system functions are equivalent to All levels of T parameter multiplicative, exchanging S-parameters to T-parameters, then it will show the characteristics of model system functions cascaded by dozens of the same drill pipe, the outcome of imitation will provide strong technical support to the project of while-drilling the acoustic transmission equipment.