The goal of this project is to extend the use of Multi-Dimensional Electrical Capacitance Volume Tomography (MD-ECVT) sensors for subsea oil and gas multiphase flow measurement to reduce subsea facility complexity, advance real-time remote monitoring of well fluids, and enable greater tieback to the surface production facility. This multiphase flow meter (MPFM) will also be tested in a relevant subsea environmental chamber to prove the mechanical integrity of the equipment in such an environment. Additionally, a datasheet will be developed for the MPFM that is representative of field operating conditions and that offers a competitive advantage over existing MPFMs on the market for subsea applications.
Tech4Imaging — Columbus, OH 43220
The Ohio State University — Columbus, OH 43220
Accuflow — Bakersfield, CA 93313
Current state of the art multiphase flow meter (MPFM) measurement for subsea has many drawbacks including high complexity, large size, low accuracy and low consistency across many flow regimes and operating conditions, safety risks with radiation, and high cost (sometimes in excess of $1M for a single unit).
In contrast, the current state of the art for ECVT technology depicts an accelerated acceptance by the multi-phase flow community. ECVT’s favorable features include its safety, fast imaging and measurement speeds, scalability to industrial size and conditions of pressure and temperature, flexibility for imaging complex geometries, low acquisition costs (projected $200–250k instead of $750–1,000k) and low operational cost. Additionally, ECVT sensors can be adapted to work in a wide array of industrial settings. Another application involved measuring mass flow rate and fluid dynamics of brine in a geothermal well with temperatures up to 250°C and pressures up to 300 psi. Furthermore, high-pressure flows are no longer an obstacle as ECVT sensors have been tested on a flow loop with over 5,000 psi pressure.
The single deployable commercial product produced will be an integrable part in reducing cost, increasing efficiency, and improving safety in Enhanced Oil Recovery (EOR) systems in subsea oil fields. Successful completion of this project would provide a cost-effective solution to EOR developers for deploying multiphase flow meters (MPFM) in remote subsea oil fields. MPFMs are critical sensors for determining when to transition to EOR, knowing what method of EOR to employ, monitoring efficiency of an existing EOR method, detecting water breakthrough, monitoring well aging, monitoring separator efficiency, and custody transfer.
The new measurement techniques used in developing the flow meter under investigation will also enrich the multi-phase flow scientific literature through published articles.
New boards have been designed to achieve higher Dynamic Range and Signal to Noise ratio. This, and the addition of temperature compensation allowing the project researchers to distinguish the minute changes more accurately in signal as the volume fraction of mixture components change. These boards are currently on order and are being assembled and tested as they arrive. Initial tests look good, with boards performing as expected. In the near future, a Data Acquisition System or DAS will be assembled from the new board designs, temperature compensated, and installed on the 3-phase flow loop. Then we will begin flow testing again. It is anticipated that the improved signal stability and resolution will allow us to better interpret the test data and finalize the 3-phase volume fraction algorithm.
In parallel with these efforts, experiments are being set up to measure the effect of salinity and temperature on the sensor response. This will allow the project researchers to predict the behavior of these sensors more accurately in the field.