基于电磁随钻测量系统的功率自适应分配方法研究

RESEARCH ON SELFADAPTING ALLOCATION TECHNIQUE BASED ON THE ELECTROMAGNETIC DRILLING WHILE MEASUREMENT SYSTEM

提出一种功率自适应分配方法,在不同地层、不同深度条件下采用不同发射功率,从而延长仪器连续工作时间。通过分析电磁信号在地层中的衰减规律,利用电流与工作深度和地层参数的关系,建立单一地层和多地层结构功率调度的数学模型,并给出井下调度参数获取的方法。最后对采用固定发射功率策略和自适应功率分配策略下的功耗进行仿真设计,比较它们在不同条件(深度、频率)下的最大工作时间。仿真结果分析表明,使用自适应调度策略大幅度节省功率,延长仪器将近40%连续工作的时间。

Selfadapting power distributive method was proposed by adopting different transmission power in different strata and depth,then the continuous working time of electromagnetic drilling while measurement system was extended. Based on the attenuation laws of electromagnetic signal in formation,a power dispatching mathemati-cal model of a single stratum and multi-strata structure was estab-lished and the approach of acquiring underground parameters was given by utilizing the relationship between the current and the work-ing depth and geological parameters. Finally,the simulation design of power consumption on strategy of fixed and adaptive transmission has been done for comparing the longest work time under different circumstances of depth and frequency. The results showed that the a-daptive scheduling strategy could save power and improve the contin-uous work time nearly 40%.