Differential signal extraction for continuous wave mud pulse telemetry

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• 作者：Jing Shao^a ; Zhidan Yan^b ; Suli Han^a ; ; Hui Li^d ; Tingzheng Gao^c ; Xiufeng Hu^c ; Chunming Wei^c
• 关键词：Measurement While Drilling ; Logging While Drilling ; Continuous wave mud pulse telemetry ; Signal extraction ; Data Extraction
• 刊名：Journal of Petroleum Science and Engineering
• 出版年：2017
• 出版时间：January 2017
• 年：2017
• 卷：148
• 期：Complete
• 页码：127-130
• 全文大小：885 K
• 卷排序：148

文摘

Continuous wave mud pulse telemetry system with a transmission rate of more than 12 bps, is an irreplaceable high-speed data transmission technology for Measurement While Drilling (MWD) and Logging While Drilling (LWD) instruments used in modern oil drilling services. However, the valid signal is difficult to be obtained because of the disturbing of pump noise in the data transmission. Here, a differential signal extraction method for continuous wave mud pulse generator is applied to extract the effective mud pulse signal from pump noise. It utilizes dual sensor and a differential algorithm to extract the signal. To verify this method, the robustness was analyzed in the numerical simulation. In the actual test, a continuous wave mud pulse generator was designed, and a hydraulic circulation laboratory was built. The Signal to Noise Ratio (SNR) was risen from −13 dB up to 25 dB. The experimental results demonstrated the effectiveness of the designed mud pulse generator, and proved that this method can be a feasible way to solve the problem of signal extraction from pump noise.