摘要
针对钻井过程中复杂的井下工况,对基于RFID(射频识别)技术的井下控制系统进行了优化设计。对RFID通讯短节及井下天线结构进行了电磁性能优化,通过试验确定了最优的天线与短节外壳内壁间距,减小了金属涡流的电磁干扰,保证了系统稳定工作;根据RFID系统数据交换时间和现场钻井液流速,优化设计天线绕线长度为300 mm,保证标签随钻井液高速流过井下天线内部时被准确读取;对RFID读取控制系统进行了软硬件优化设计,增加了自适应优化模块和信号处理模块,能够根据井下电磁环境的影响,自动调节系统工作频率,使系统工作在最佳状态,标签读取成功率100%;通过优化算法、CRC校验等方式,提高了控制信号解析的正确性。在江苏淮安顺89井成功进行了下井试验,验证了整个系统的工作可靠性和稳定性。该研究为今后基于射频识别控制技术的井下工具开发具有指导意义。
RFID(radio frequency identification)downhole control system was optimally designed to deal with the complex down-hole situations in the process of well drilling.First,the electromagnetic properties of RFID communication sub and downhole antenna were optimized and the optimal spacing between the antenna and the inner wall of the sub shell was experimentally determined,so that the electromagnetic interference of eddy current is reduced and the RFID downhole control system can work stably.Second,the winding length of the antenna was optimized to be300mm according to the data exchange time of RFID system and the in-situ flowing rate of drilling fluid,so that the tag can be read accurately while it flows with the drilling fluid at high speed inside the downhole antenna.Third,the software and hardware of RFID reading control system were optimized and self-adaption optimization module and signal processing module were introduced,so that the working frequency of the system can be regulated automatically on the basis of the downhole electromagnetic environment and the system can be kept in the optimal state with the success ratio of tag reading of100%.Fourth,the analytical accuracy of control signals was improved by means of optimization algorithm,CRC check and so on.Finally,the whole system was successfully tested in Well Shun89in Huaian,Jiangsu.It is verified that the whole system is reliability and stability.The research results provide the basis for the development of RFID based downhole tools in the future.
作者
胡亮
HU Liang(SINOPEC Research Institute of Petroleum Engineering, Beijing 100101, China)
出处
《石油钻采工艺》
CAS
CSCD
北大核心
2018年第5期596-600,共5页
Oil Drilling & Production Technology
基金
中国石化科技攻关项目"基于RFID控制随钻扩眼器技术研究"(编号:P15007)
关键词
钻井
随钻扩眼
射频识别
控制系统
电磁优化
自适应优化
drilling
reaming while drilling
radio frequency identification (RFID)
control system
electromagnetic optimization
self-adaptation optimization
