Design And Implementation Of Mobile High-resolution Depth Scaling Equipment For Oilfield

For the problem of how to mark logging cable accurately and how to return accu-rate logging data in the process of logging, this paper designs and implements the mobilehigh-resolution depth marking equipment used for oilfield. The common logging methodis that mark logging cable artificially in laboratory, detect magnetic signal and measuredepth through Mardingdack. But Oilfield is located in romote areas where operating en-vironment is harsh especially in winter when the temperature can reach minus30degree.Cable freezing will lead slipping of Mardingdack which makes accuracy decrease. IfMardingdack freeze, it can not return measurement data normally which makes Marding-dack can not work normally. Logging data is very important information for oil explo-ration, so the require of logging accuracy in the process of oil exploration is very high,however, the commonly used Mardingdack method does not meet the high requirements.Firstly, this paper presents a program of mobile high-resolution depth marking e-quipment used for oilfield. Lay a magnetic signal every20meters for logging cable, anddivide every20meters into0.5meters, then calculate the speed of logging cable in realtime through cross-correlation velocity algorithm, finally, calculate the depth through thenumber of magnetic signal and speed of cable.Then, This paper also makes design and implementation on mobile high-resolutiondepth marking equipment used for oilfield from mechanical design. Research on mechan-ical design requirements, material selection, design of shell, design of marking mechanis-m, measures of anti-oil and error analysis is conducted and fine-tuning mechanism isdesigned for the equipment.Furthermore, in this paper, research and design on magnetization, demagnetizationand reading magnetic signal from the aspects of principle, hardware circuit, softwarecontrol and experiment results is conducted. Suitable methods of magnetization, demag-netization and reading magnetic signal are found and implemented based on hardwarecircuit and software control program.Finally, this paper processed the collected signal. Due to the external noise, fil-tering is needed for the collecting magnetic signal. The number of magnetic labels isobtained through peak detection and the speed of logging cable is obtained through cross-correlation operation. The final loging data is obtained through the number of magnetic labels and the speed of logging cable. The final experiments show that this program pro-posed in this paper not only can finish marking lable on logging cable once, but also canimprove the accuracy and resolution of logging data. All software control program of thispaper are implemented based on LabVIEW Program.