Design of High Temperature Combline Band-pass Filters for Downhole Communications

2016 ◽  
Vol 2016 (HiTEC) ◽  
pp. 000312-000317 ◽  
Author(s):  
Mohammed Ehteshamuddin ◽  
Jebreel M. Salem ◽  
Dong Sam Ha
Keyword(s):  
High Temperature ◽  
Insertion Loss ◽  
Oil And Gas ◽  
Oil And Gas Industry ◽  
Heat Extraction ◽  
Simple Method ◽  
Gas Industry ◽  
Rf Filter ◽  
Stable Performance ◽  
Band Pass

Abstract The decline of easily accessible reserves pushes the oil and gas industry to drill deeper to explore previously untapped wells. Temperatures in these wells can exceed 210 °C. Cooling and conventional heat extraction techniques are impractical in such a harsh environment. Reliable electronic designs that can sustain high temperature become necessary. This paper presents RF and IF microstrip combline band-pass filters for downhole communications, which can reliably operate up to 250 °C. Both filters are prototyped on a Rogers RO4003C substrate. Measured results at 250 °C show that the RF and IF filters have insertion losses of 4.53 dB and 3.45 dB, respectively. Both filters have stable performance at high temperatures. The maximum insertion loss variation with temperature for the RF filter is 1.88 dB, and bandwidth variation is 1.3 MHz. The maximum insertion loss variation with temperature for the IF filter is 1.48 dB, and bandwidth variation is 0.4 MHz. Return loss for the RF filter is more than 12 dB, and for the IF filter more than 10 dB in the passband. This paper also describes a simple method to find spacing between coupled symmetrical microstrip lines of a combline filter.

A High Temperature Passive GaN-HEMT Mixer for Downhole Communications

2016 ◽  
Vol 2016 (HiTEC) ◽  
pp. 000272-000277 ◽  
Author(s):  
Jebreel M. Salem ◽  
Dong Sam Ha
Keyword(s):  
High Temperature ◽  
Oil And Gas ◽  
Wide Band ◽  
High Electron Mobility Transistor ◽  
Oil And Gas Industry ◽  
Heat Extraction ◽  
High Electron ◽  
Reliable Operation ◽  
Gas Industry ◽  
Gap Technology

Abstract Declining reserves of easily accessible natural resources have motivated the oil and gas industry to drill deeper. Temperatures in these hostile wells can exceed 210 °C. Cooling and conventional heat extraction techniques are impractical in such a harsh environment. Reliable electronic designs that can sustain high temperature become necessary. This paper presents a high temperature passive RF mixer that is suited for downhole communications. The proposed mixer is designed to upconvert or downconvert the incoming signal with a low conversion loss (CL) and high linearity and reliable operation at temperature up to 250 °C. Gallium Nitride (GaN) is a wide band gap technology that can provide a reliable operation at the elevated ambient temperature, and the proposed mixer adopts a commercial GaN high electron mobility transistor (HEMT) technology. Measurement results indicate that the proposed mixer achieves CL of 6.5 dB at LO power of 2.5 dBm for the downconversion from 230–253 MHz to 97.5 MHz at 250 °C and input P1dB compression point lies at 5 dBm. The power dissipation of the mixer is virtually zero.

POL and LDO for Harsh Environment Applications

2013 ◽  
Vol 2013 (HITEN) ◽  
pp. 000075-000081
Author(s):  
Ramesh Khanna ◽  
Srinivasan Venkataraman
Keyword(s):  
High Temperature ◽  
Oil And Gas ◽  
High Reliability ◽  
Oil And Gas Industry ◽  
Building Blocks ◽  
Low Noise ◽  
Harsh Environment ◽  
Buck Converters ◽  
Gas Industry ◽  
Component Selection

Harsh Environment approved components/ designs require high reliability as well as availability of power to meet their system needs. The paper will explore the various design constrains imposed on the high temperature designs. Down hole oil and gas industry requires high reliability components that can withstand high temperature. Discrete component selection, packaging and constrains imposed by various specification requirements to meet harsh environment approval are critical aspect of high-temp designs. High temperature PCB material, PCB layout techniques, trace characteristics are an important aspect of high-temperature PCB design and will be explored in the article. Buck Converters are the basic building blocks, but in order to meet system requirements to power FPGA's where low output voltage and high currents are required. Converter must be able to provide wider step down ratios with high transient response so buck converters are used. The paper with explore the various features of a buck-based POL converter design. Low noise forces the need for Low-dropout (LDO) Regulators that can operate at high Temperatures up to 210°C. This paper will address the power requirements to meet system needs.

A Resistive GaN-HEMT Mixer for a Cable Modem Operable up to 250°C for Downhole Communications

2017 ◽  
Vol 14 (1) ◽  
pp. 17-25 ◽  
Author(s):  
Jebreel M. Salem ◽  
Dong Sam Ha
Keyword(s):  
High Temperature ◽  
Oil And Gas ◽  
High Electron Mobility Transistor ◽  
Oil And Gas Industry ◽  
Intermediate Frequency ◽  
Local Oscillator ◽  
Heat Extraction ◽  
High Electron ◽  
Reliable Operation ◽  
Ambient Temperatures

It is necessary for the oil and gas industry to drill deeper due to decrease of easily accessible natural reserves. Temperatures of deep wells can exceed 210°C, and conventional cooling and heat extraction techniques are impractical in such a harsh environment. Reliable electronic designs that can sustain high temperature become necessary. This article presents a high-temperature passive radio frequency (RF) mixer for downhole communications. The proposed mixer is designed to upconvert or downconvert the incoming signal with low conversion loss (CL), high linearity, and reliable operation at the ambient temperature up to 250°C. GaN is a wide-bandgap technology that can provide a reliable operation at high ambient temperatures, and the proposed mixer adopts a commercial GaN high-electron-mobility transistor. Measurement results indicate that the proposed mixer achieves a CL of 7.1 dB at local oscillator (LO) power of 2.5 dBm for the downconversion from 230–253 to 97.5 MHz at 250°C and the input P1dB compression point lies at 5 dBm. The designed mixer also achieves 24.5 dB RF-to-intermediate frequency (IF) isolation and 28 dB LO-to-IF isolation at 250°C. The power dissipation of the mixer is virtually zero.

Importance of ambient cure for high-temperature coatings

2020 ◽  
Vol 60 (2) ◽  
pp. 654
Author(s):  
Graeme Ross
Keyword(s):  
High Temperature ◽  
Oil And Gas ◽  
Oil And Gas Industry ◽  
Gas Industry ◽  
Final Project ◽  
Test Methodology ◽  
Silicone Coatings ◽  
Increasing Process ◽  
Increasing Demand ◽  
Project Location

Due to increasing demand for energy around the world, the prevalence of global megaprojects within the oil and gas industry is increasing. Process pipes, valves and vessels may be manufactured and coated in China or Korea, where labour costs are comparatively low, before being transported to the final project location, such as Western Australia. During the transport and fabrication phase, coated steelwork may spend months or even years exposed to harsh offshore or coastal environments before going into service. This means coatings must be able to provide protection throughout an extensive construction phase, in addition to the in-service lifetime of the steel. This paper examines the demands on high temperature performance coatings both before and once in service. Test methodology and exposure data are reviewed with a focus on how modern aluminium pigmented silicone coatings provide a solution to the corrosion challenges faced in global megaprojects.

scholarly journals NDT application for detection of corrosion under insulation in Vietnam

2021 ◽  
Vol 11 (1) ◽  
pp. 48-54
Author(s):  
The Man Nguyen ◽  
Duc Vinh Vu
Keyword(s):  
High Temperature ◽  
Oil And Gas ◽  
Oil And Gas Industry ◽  
Piping System ◽  
Gas Industry ◽  
Non Destructive Evaluation ◽  
The Cost ◽  
Fluid Leak ◽  
Non Destructive ◽  
Corrosion Under Insulation

: In the oil and gas Industry, insulation materials can be used widely for piping system, tank and vessel in either low or high temperature applications. CUI can cause equipment degradation, fluid leak, which lead to explosion or environmental pollution and the cost will very expensive. Therefore, CUI need to be detected early to prevent damage. Through experiment, Center for Non-Destructive Evaluation (NDE) studied on establishing and appliying 4 NDT procedures for CUI examination on typical petroleum piping using in Vietnam. A discussion is presented below

Numerical Analysis of Elbow Erosion Mitigation Using Swirl Pipes in Gas-Particle Two-Phase Flows

2021 ◽  
Author(s):  
A. Farokhipour ◽  
Z. Mansoori ◽  
M. Saffar-Avval ◽  
G. Ahmadi
Keyword(s):  
Erosion Rate ◽  
Oil And Gas ◽  
Oil And Gas Industry ◽  
Swirl Flow ◽  
Sand Particle ◽  
Two Phase ◽  
Simple Method ◽  
Gas Industry ◽  
Sand Erosion ◽  
Erosion Mitigation

Abstract In the oil and gas industry, sand particle erosion damage to elbows is a common problem. The ability to predict erosion patterns is of great importance for sizing lines, analyzing failures, and limiting production rates. Computational fluid dynamics (CFD) can be utilized to study the erosion behavior and mitigate the erosion problem for safety purposes and greater equipment longevity. In order to alleviate the adverse results of sand erosion in elbows, the current study investigated the potential of the geometrically induced swirl flow generated from flow passing through a four-lobed twisted pipe upstream of an elbow. To this end, first, the airflow in a standard elbow equipped with different swirl pipes was simulated using the SIMPLE method, then an Eulerian-Lagrangian approach was employed to track the particles, and finally, the erosion rate was computed. The simulation results indicated that the elbow’s maximum erosion rate with twisted pipes placed upstream of the elbow is lower than the one obtained for the standard pipe. In addition, as the twisted pipe position gets closer to the bend, the erosion rate further reduces. Thus, swirling flows provide a promising prospect as a mechanism to control the erosion rate in elbows.

High temperature sweet corrosion and inhibition in the oil and gas industry: Progress, challenges and future perspectives

2020 ◽  
Vol 185 ◽  
pp. 106469 ◽  
Author(s):  
I.B. Obot ◽  
Ikenna B. Onyeachu ◽  
Saviour A. Umoren ◽  
Mumtaz A. Quraishi ◽  
Ahmad A. Sorour ◽  
...  
Keyword(s):  
High Temperature ◽  
Oil And Gas ◽  
Oil And Gas Industry ◽  
Future Perspectives ◽  
Gas Industry ◽  
Sweet Corrosion

Lifetime prediction of aramid yarns applied to offshore mooring due to purely hydrolytic degradation

2019 ◽  
Vol 27 (8) ◽  
pp. 518-524
Author(s):  
Juliano Picanço Duarte ◽  
Carlos Eduardo Marcos Guilherme ◽  
Antonio Henrique Monteiro Fonseca T da Silva ◽  
Adriano Câmara Mendonça ◽  
Felipe Tempel Stumpf
Keyword(s):  
Tensile Strength ◽  
High Temperature ◽  
Oil And Gas ◽  
Steel Wire ◽  
Hydrolytic Degradation ◽  
Oil And Gas Industry ◽  
Oil Fields ◽  
Offshore Platforms ◽  
Gas Industry ◽  
Service Conditions

The discovery of oil fields in deepwater over the last decades led the oil and gas industry to the necessity of replacing the steel wire cables of the mooring systems of offshore platforms by polymeric ropes. These systems must be designed to work for at least 20 years without showing substantial loss in tensile strength or in their mechanical behavior along this period. However, some polymers present degradation by seawater through the process of hydrolysis, and the question whether it affects significantly the materials’ ultimate tensile strength arises. Accelerated hydrolysis tests were conducted in yarn samples of aramid at high temperature in order to use the Arrhenius correlation to predict their lifetime under service conditions. In order to decouple the total degradation into a thermal and a purely hydrolytic part, separate aging experiments were performed into a dry chamber and the conclusion was that thermal degradation does not play a significant role in the total degradation of aramid due to the water submersion at the temperatures tested.

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