Results 281 to 290 of about 1,642,785 (302)

A Comparison of Mud Pulse and E-Line Telemetry in Alaska CTD Operations

SPE/ICoTA Coiled Tubing Conference and Exhibition, 2002
Abstract Coiled Tubing Drilling (CTD) has been used on the North Slope of Alaska to drill in excess of 250 re-entry sidetrack wells since 1994. Most of the through tubing coil sidetracks were drilled with a conventional bottom hole assembly (BHA) consisting of a mud pulse MWD tool, and a mechanical/hydraulic orienter.
James Ohlinger, Lamar Gantt, Thomas McCarty   +2 more
openaire   +1 more source

Continuous wavelet transformation: A novel approach for better detection of mud pulses

Journal of Petroleum Science and Engineering, 2013
Abstract Mud pulse telemetry systems use coded pressure pulses (carriers) for transmitting measured downhole information (directional and geological information) to the surface in real time. The detection of the pulses and the extraction of their characteristics (start, duration and frequency) in a noisy pressure signal measured in the mud column at ...
Mohammed A. Namuq, Matthias Reich, Swanhild Bernstein   +2 more
openaire   +1 more source

Applying Digital Data-Encoding Techniques to Mud Pulse Telemetry

Petroleum Computer Conference, 1990
ABSTRACT More and more downhole devices are requiring two-way communication with the surface to telemeter data and device status and/or receive telemetered instructions which effect the operation or status of the downhole device. This paper examines the application of digital data-encoding techniques to MWD mud pulse telemetry and shows ...
openaire   +1 more source

Design of a rotary valve orifice for a continuous wave mud pulse generator

Precision Engineering, 2015
Abstract High-speed downhole transmission technology plays an important role in measurement while drilling (MWD) and logging while drilling (LWD) systems, where the continuous wave mud pulse transmission method is currently the most advantageous method for wireless downhole transmission.
Yan Zhidan, Wei Chunming, Geng Yanfeng, Shao Jing, Hu Xiufeng, Li Yuan   +5 more
openaire   +1 more source

Real-Time Lexicographic MPC with Online Correction for Intelligent Drill-Bit Rotary Valves in Mud-Pulse Telemetry

Processes
Reliable front-end pressure-pulse generation is critical to mud-pulse telemetry because waveform distortion introduced at the rotary valve propagates through the telemetry chain and reduces downstream recoverability.
Xuecheng Dong, Liangzhu Yan, Lingyun Wang, Zhiyuan Zhou, Youyan Jian, Run Li   +5 more
semanticscholar   +1 more source

A transient flow analysis method for high-rate mud pulse telemetry in rotary steerable system

Geoenergy Science and Engineering, 2023
Hu Han, Liang Xue, Tianqi Yao, Lewang Sun, Honghai Fan, Zhiming Wang   +5 more
semanticscholar   +1 more source

Study on boundary reflection mechanism of continuous wave mud pulse in the flow loop

Geoenergy Science and Engineering, 2023
Hu Han, L. Xue, Lewang Sun, H. Fan, Zhiming Wang   +4 more
semanticscholar   +1 more source

A numerical simulation noise reduction algorithm for removing spectrum overlap noise and an adaptive threshold recognition mud pulse signal algorithm in MWD

IEEE Advanced Information Technology, Electronic and Automation Control Conference, 2022
Naipeng Liu, Shilong Cheng, Di Zhang, Yule Hu, Hui Gao, L. Duan, Yongli Zou   +6 more
semanticscholar   +1 more source

Statistical signal analysis and estimation algorithms for mud pulse telemetry systems

2012
[no abstract]
openaire   +1 more source

Continuous wave mud pulse generator control using improved sliding mode reaching law

International Conference on Laser, Optics and Optoelectronic Technology, 2022
Bo-pi Jin, Shen-hua Wu, Hai Gong, Shengxuan Yang   +3 more
semanticscholar   +1 more source