From Oilfield Wiki:
Corrosion is a natural potential hazard associated with oil and gas production and transportation. This results from the fact that an aqueous phase is inevitably co-produced with the oil and/or gas. The inherent corrosivity of this aqueous phase is then heavily dependent on the levels of dissolved CO2 and H2S acidic gases which are also co produced.
In the oil and gas sector corrosion is a serious problem. Internal corrosion in oil and gas industry is generally caused by water, carbon dioxide (CO2) and hydrogen sulfide (H2S), and also can be aggravated by microbiological activity. This internal corrosion needs to be controlled and monitored and Sensorlink provides tools that will be useful in these operations.
From Oilfield WIKI:
Erosion has been long recognized as a potential source of problems in oil and gas production systems. It refers to the loss of materials on internal surface of various parts of a production system due to production fluid mixture (especially with sand) that impacting the inner surface at an angle and typically at high velocity. Erosion has been long recognized as a potential source of problems in oil and gas production systems with numerous previous dangerous erosion failures that resulted in loss of containment.
As with corrosion it is important to monitor and control the erosion in a production system. Sensorlink provides tools that will help in this process.
Ultrasonic Pulse Echo
Ultrasonic pulse-echo measurement is a well-established Non-Destructive Testing (NDT) method for measuring wall thickness and detecting defects.
When it comes to erosion and corrosion monitoring, ultrasound has distinct advantages compared to other available techniques. It is noninvasive and measures the metal thickness directly and is not dependent on indicators like for example probes and coupons.
Advances in low-noise electronics, sensor technology and signal processing algorithms now make it possible to achieve high resolution results using a permanently installed ultrasonic pulse echo unit.
Sensorlink utilizes ultrasonic pulse-echo technology to provide accurate measurements of internal corrosion and erosion rates.
Ultrasonic measurement of wall thickness has conventionally been carried out manually by use of a suitable ultrasonic transducer and a measuring instrument. In most cases a basic probe utilizing a simple contact transducer to determine the thickness of the pipeline wall at a specific spot. This method usually yields a typical accuracy in the range of plus or minus 0.1 to 0.2 mm, depending on the skill of the operator.
The Sensorlink technology is capable of measuring changes in the wall thickness with greater accuracy, thus avoiding the uncertainty caused by inadequate instruments or unskilled operators. Wall thickness can be measured to a very high accuracy by repeating measurements at the same spot over time with permanently installed instrumentation.
Resolution of such high quality and accuracy has been made possible by careful refinement of Sensorlink equipment, production and technology, with notable innovations in the following areas:
- Signal processing
- Electronics with high signal to noise ratios
- Optimum placement of transducers relative to the pipewall
- Electronics and transducers capable of operating in seawater at great depth and in high temperature
- Temperature compensation capability: the system is able to adjust to variations in the speed of sound caused by temperature variations in the medium (seawater or steel)
- Delivers real time data
- Automated measurement, logging and analysis