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A standalone data logger is a data-capturing device that, once initialized, can automatically log data and store it in its on-board memory. After a data logging session is completed, data stored in memory can be downloaded into a computer for analysis to provide information on the history of parameters or events. Typically, a standalone data logger consists of a central processor unit (CPU), analogue to digital converter, data memories and other support electronics. It can accept signal from various sensors such as accelerometers, strain gauges, displacement sensors, inclinometers and pressure gauges etc. One example of standalone data logging in the offshore oil production industry is to record riser displacements as the result of vortex induced vibration (VIV) or drilling process. Standalone motion loggers are attached to risers over a lengthy period to record motion. This can provide vital information on the fatigue life of the riser. Standalone data logging is not real-time data logging. Data can only be viewed and analyzed after the data is downloaded into a computer. However, it can provide economical and rapid instrumentation deployment, with simple interfaces and minimal impact on platform equipment.
Drilling and workover operations
During both drilling and workover operations, it is important to ensure that tension, bending moment and movement is kept at a bare minimum, accurate monitoring of these factors, either continuously or as a part of an assessment. For drilling operations, we arrange our sensors strategically in order to detect relevant loads, such as movement or VIV (vortex induced vibrations), but also motion, tension and bending moment. During workover operations, we arrange sensor on the tension point and on the lower tapered stress joint and, if required, on the LRP (lower riser package) or EDP (emergency disconnect package).
Wellhead structural monitoring
To determine the tension and bending moment at the wellhead, we place sensors as far down as possible on the BOP connector, on the BOP, and on the flex joint. This provides an accurate measurement that allows us to assess the fatigue and remaining service life of the wellhead.
Vibration subsea and EEx Zone
ELB-REV4 iSCADA based development board provides systems for monitoring high frequency vibrations (>1Hz), both subsea and topside, based on strain measurements and accelerations. Subsea monitoring may be combined with hydrophones, and is ROV/diver installable. Topside may include EEx Zone requirements.
We use LVDT (linear variable differential transformer) and hydro acoustic sensors attached with ELB-REV4 iSCADA to measure displacement from a micro meter to meter range. This may be combined with other sensor systems to provide additional information. Systems are custom built to suit the application.
There is a wide range of advanced sensors available in the market that can be integrated easily with the ELB-REV4 iSCADA development board. Typically, these sensors consist of a sensing element and integrated amplifier & conditioning circuits. The sensor requires a single rail power supply and the output from the sensors is simply an electrical voltage or current. The sensors utilize latest sensor technologies to achieve low power consumption and high performance.
- Micro-electronic machined (MEMS) accelerometers
- Angular velocity sensors (MEMS Gyroscopes)
- Linear displacement gauges (LVDTs)
- Pressure sensors (silicon sensors)
- Temperature sensors
- Load sensors for tension and compression
- Current waves and position
- I. The logger...