摘要
为获取井下待测地层的压力/温度,提出了一种“压力-空-温度-空”缆芯复用的频率分时传输方法.将脉冲数据与直流能量叠加,以电流形式馈入电缆,实现能量/数据的耦合传输.利用双计数器同步测频消除了1个字误差,并设计了压力/温度实际值的拟合算法.试验结果表明,该测量方法能够满足井下远距离传输的要求,可与电子压力计配合实现地面直读测量,压力测量精度为0.1%FS,温度测量精度为±0.5℃.
To obtain pressures and temperatures of the formations in oil and gas well testing, a downhole wireline remote telemetry method is developed by using time division frequency transmission technology in the ＇Pressure-Low-Temperature-LoW mode, It also enables to supply power to the downhole tool on a single-core wired-armored cable. The coded pulse data are modulated on power signals. Then the surface processor uses double countered synchronism method to measure the pressure/temperature frequencies. A fitting algorithm is presented to solve actual pressures and temperatures. The results show that the developed methods can satisfy the requirements of downhole remote telemetry and surface readout using a wireline-conveyed gauge. The system has been successfully applied to the onshore well testing with a pressure accuracy of 0. 1%FS and temperature accuracy of ±0. 5℃.
出处
《传感技术学报》
CAS
CSCD
北大核心
2007年第4期929-932,共4页
Chinese Journal of Sensors and Actuators
关键词
压力/温度测量
电缆遥测
频率分时传输
地面读取
井下
pressure/temperature measurement
wireline telemetry
time division frequency transmission
surface readout
downhole
作者简介
丁天怀（1945-），男，汉，江苏大丰，教授（博导）．现从事特种传感器与测控系统、光机电一体化技术与设备，及油气井地层测试技术与装置的研究．迄今共承担或负责国家科技攻关、自然科学基金、省部委科研课题及企业合作研发任务30多项，发表学术论文近百篇，其中，被SCI、EI和ISTP收录近40篇，dlnj@mail．tsinghua．edu．cn
李成（1977-），男，汉，天津，博士研究生．现从事油气井测试，传感器与智能仪器的研究．已发表国内外学术论文十余篇，其中SCI、EI和ISTP源共10篇，li-c02@mails．tsinghu.edu．cn
