Signal Propagation and Attenuation of Electromagnetic Telemetry System for Measurement-While-Drilling

2010 ◽  
pp. 1-7
Author(s):  
Wu Xiang ◽  
Wang Da ◽  
Wang Rongjing
Keyword(s):  
Signal Propagation ◽  
Telemetry System ◽  
Measurement While Drilling

Integrated Underreamer Technology with Real-Time Communication Helped Eliminate Rathole in Exploratory Operation Offshore Nigeria

2021 ◽  
Author(s):  
Raphael Chidiogo Ozioko ◽  
Humphrey Osita ◽  
Udochukwu Ohia
Keyword(s):  
Real Time ◽  
New Technology ◽  
Telemetry System ◽  
Operational Risks ◽  
Drilling Performance ◽  
Drilling Tools ◽  
Measurement While Drilling ◽  
Drilling Operations ◽  
Logging While Drilling ◽  
Fast Activation

Abstract This paper describes the successful deployment of integrated underreamer technology with real-time communication through mud-pulse telemetry system, to drill and eliminate rathole in 17 1/2-in × 20-in successfully in one run and helped set casing as close as possible to the depth of suspected pressure ramp on an exploratory well offshore Nigeria. This technology uses the same communication system (actuator bypass) as Measurement While Drilling tools (MWD), Logging While Drilling tools (LWD) and Rotary Steerable System (RSS). Integrated underreamers broadly used in the drilling operations support optimized casing and completion programs and helps reduce operational risks such as wellbore instability. The ball drop and hydraulically activated reamer technologies available today comes with limitations and HSE risks. The distinctive functionalities of the integrated underreamer technology described here, such as unlimited and fast activation and deactivation via downlinking and real time downhole feedback, reduce uncertainties and operational costs in the complex and challenging deep offshore drilling operations. The real-time communication through mud-pulse telemetry system enabled the placement of integrated underreamer 6 meters from the bit thereby reducing rathole length to approximately 9 meters compared to 80 meters for conventional underreamer application. The integrated underreamer is compatible with existing RSS and provide unlimited activation cycles. The integrated underreamer offers flexibility in placement in the bottom hole assembly (BHA) and it can be used as a near bit reamer, or as main reamer or as both. In this case, the integrated near bit underreamer eliminated the need for a dedicated rathole removal run. It also offered a feedback confirmation of the cutter blades activation status and provided hole opening log thereby reducing the operational uncertainties for the under reaming, saving rig time up to 16 hours for shoulder test. The underreamer was successfully deployed to drill and ream the challenging 14 ¾" × 17 ½" and ream 17 ½" × 20" section offshore Nigeria. Both sections were drilled and reamed to section Total Depth (TD) in one run with all directional reuirements and Measuring While Drilling (MWD)/Logging While Drilling (LWD) met saving client approximately 4 days of rig spread cost. The reamer appeared to provide an in-gauge borehole allowing for successful running and cementing of liners without any issues, demonstrating superior borehole quality. The new Technology proved to be a reliable and flexible hole enlargement while drilling solution that help to improve drilling performance, reduce operational risks and save cost.

Construction of a mathematical model of the signal propagation of the data exchange system between the control unit and the actuators located in the reactors of specialized chemical-technological equipment

2021 ◽  
Author(s):  
A.A. Kharchenko ◽  
S.I. Vidyakin ◽  
L.A. Tishchenko
Keyword(s):  
Mathematical Model ◽  
Magnetic Induction ◽  
Data Exchange ◽  
Control Unit ◽  
Signal Propagation ◽  
Metallographic Analysis ◽  
Telemetry System ◽  
Technological Equipment ◽  
Exchange System ◽  
The Mathematical Model

This paper presents a method for compiling a mathematical model of the signal propagation of the data exchange system between the control unit and the actuators located in the reactors of specialized chemical-technological equipment. The case of the implementation of a modern telemetry system and the main problems in the development of these systems are considered. To develop a mathematical model, a method was written for calculating the EMF of the secondary winding for the system under consideration, namely, the transformer with an open core. The search for a rational frequency for the simulated system is performed. The values of the magnetic induction for different distances between the windings are obtained. The scheme for studying the dependence of the magnetic induction on the magnetic field strength is assembled. To determine the grain size, a metallographic analysis of the pipeline microstructure was performed. The necessity of comparing the experimental data and the data obtained by theoretical calculation is revealed; corrections of the mathematical model are made. The signal propagation range was predicted at a distance of about a meter. Based on the comparison of the mathematical model and the experiment, it is necessary to adjust the first one and develop a methodology for choosing rational parameters of the telemetry system for designing a data exchange system. The developed mathematical model for estimating the parameters of the propagation of the e / m wave allows us to predict the propagation of the signal at a given distance.

Development of a miniature telemetry system.

1964 ◽  
Author(s):  
David A. Kavanagh
Keyword(s):  
Telemetry System

Feasibility Implementation of Voltage-Current Waveform Telemetry System in Power Delivery System

2011 ◽  
Vol 131 (4) ◽  
pp. 288-294 ◽  
Author(s):  
Tatsuya Furukawa ◽  
Keita Akagi ◽  
Hisao Fukumoto ◽  
Hideaki Itoh ◽  
Hiroshi Wakuya ◽  
...  
Keyword(s):  
Delivery System ◽  
Power Delivery ◽  
Telemetry System ◽  
Current Waveform

Electromagnetic Step Signal Propagation in Lossy Waveguide

1997 ◽  
Vol 51 (2-3) ◽  
pp. 149-159
Author(s):  
K. M. Yemelyanov ◽  
Oleg Aleksandrovich Tretyakov ◽  
S. B. Nikitskiy
Keyword(s):  
Signal Propagation

The efficiency of application of virtual cross-sections method and hypotheses MELS in problems of wave signal propagation in elastic waveguides with rough surfaces

2016 ◽  
pp. 3564-3575 ◽  
Author(s):  
Ara Sergey Avetisyan
Keyword(s):  
Half Space ◽  
Cross Sections ◽  
Classical Method ◽  
Signal Propagation ◽  
Elastic Half Space ◽  
Layered Systems ◽  
Surface Layers ◽  
Inhomogeneous Surface ◽  
Wave Signal ◽  
The Impact

The efficiency of virtual cross sections method and MELS (Magneto Elastic Layered Systems) hypotheses application is shown on model problem about distribution of wave field in thin surface layers of waveguide when plane wave signal is propagating in it. The impact of surface non-smoothness on characteristics of propagation of high-frequency horizontally polarized wave signal in isotropic elastic half-space is studied. It is shown that the non-smoothness leads to strong distortion of the wave signal over the waveguide thickness and along wave signal propagation direction as well.  Numerical comparative analysis of change in amplitude and phase characteristics of obtained wave fields against roughness of weakly inhomogeneous surface of homogeneous elastic half-space surface is done by classical method and by proposed approach for different kind of non-smoothness.

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