New Mud-Pulse Telemetry System Delivers Improved Drilling Dynamics and Formation Evaluation Data

Abstract

Abstract As wells become more challenging, the need for real-time data continues to increase. Drilling dynamics data allow faster drilling, while formation evaluation data allow accurate well placement to maximize reservoir value. Increased information from downhole allows better risk mitigation for safer drilling. The increased need for real-time data places higher demands on telemetry systems. A new mud-pulse telemetry system is introduced based on an evolution of a proven annular venting pulser technology. This paper describes some of the engineering work undertaken to improve power management, actuation of the valve, and valve durability, thereby increasing the endurance and data rate of the system. Some of the compression algorithms and techniques developed to maximize the effective data rate delivered by the system are also described with examples of these techniques applied to real formation evaluation data. This system has been deployed in multiple locations globally and has been run in the field more than 100 times. The paper presents information on the data rate achieved during these runs, demonstrating the step-change increase in performance over the current annular venting pulser system. Multiple case studies are also presented, demonstrating the benefits delivered by the system: The improved power management enables drilling long sections in a single bit-run.The higher data rate allows frequent pressure-while-drilling updates to help mitigate potential well control issues.Use of this system in combination with compression algorithms allows the delivery of real-time density image data of equivalent quality to recorded data. The paper concludes by discussing further planned improvements to both downhole compression and surface detection techniques that will further increase the amount of real-time data that can be delivered, allowing operators to drill safely, fast, and on target.