Mirmorax Subsea Technologies -Oil in Water Measurements for subsea applications Eivind Gransæther CEO. Mirmorax AS

Transcription

1 Mirmorax Subsea Technologies -Oil in Water Measurements for subsea applications Eivind Gransæther CEO p1 Mirmorax AS

2 Short about Mirmorax Established 2009 to become the preferred and trusted supplier of subsea multiphase sampling systems for the oil and gas industry. Expanded in 2010 by acquisition of Roxar s Oil in Water Business Unit. Our key expertise is deepwater engineering, cybernetics and product development. Our capacities include detailed market knowledge, operational understanding, reliability design, testing and qualification Gunnar Hviding Chairman of the Board and Partner Eivind Gransæther CEO and Partner Per Hassel Sørensen Principle Development Engineer Erlend Blanchard Business Unit Manager Svein Torkelsen Technical Product Manager Adrian Rognerud - QAHSE Jon Egil Stand (C) Reliability analysis Paul Fisher (C) Marketing and market analysis p2 Mirmorax AS

3 Partners In addition to having key competence within our own products portfolio, we also see the unique value in forging alliances with partners who have acquired experience and knowledge and that can support and assist Mirmorax with insight and capacity. TNO is our main technology partner and has detailed knowledge on hyrdoachoustical measurement systems p3 Mirmorax AS

4 Our Business Units Oil in Water Mirmorax today offeres topside Oil in Water monitoring systems and has a install base of monitors that are in operation and is serviced on a continuous basis. Based on the robust nature of the system and the good feedback of our customers, we are developing a subsea retrievable Oil in Water monitor to enable subsea processing in a controlled manner over lifetime of the field Multiphase Sampling The multiphase sampling technology is developed and tested over the past two years and is based on patented and award winning design. It s the only technology on the market to deliver phase representative volumetric samples from multiphase flow. This gives operator access to data useful for calibration and reservoir simulations. The technology is currently being qualified for both subsea and topside applications p4 Mirmorax AS

5 Subsea Oil in Water Motivation Subsea processing is a growing interest motivated by increased water depths and economics of production in deep and ultradeep waters Certain sizes and concentrations of oil particles or in combination with fine sands has proven to partly or completely clog injection wells Lack of subsea processing control may then lead to clogging of injection wells and hinder produced water to be re-injected Not being able to re-inject the produced water, will eventually lead to reduced or complete shut down of production A robust and accurate subsea oil in water monitor will provide detailed data on size distributions and concentrations and enable full control of processing performance independent of water depth and distance p5

6 Measuring oil-in-water OSPAR performance standard 2007: No individual offshore installation should exceed a performance standard for dispersed oil of 30 mg/l for produced water discharged into the sea Reference method is a modified ISO , GC-FID: OSPAR reference method for the determination of the content of dispersed mineral oil in water by means of gas chromatography Monitoring OiW Online Manual sampling and lab. analysis Online oil-in-water monitors can be used for reporting p6

7 Measurement principle (1) Ultrasonic transducer inside flow. Acoustic energy focused into a small area. All particles in flow reflect/scatter acoustic energy. The scattering of the acoustic energy is described by a known model A ~ d 3 A ~ d sand oil A( d) =γrd The size of the backscattered amplitude is proportional to the size of the particle. p7 Mirmorax AS

8 Technology Core Functionality Sweeps of ultrasound is sent out Buffer of count curves, each containing 5000 measurements. Overall statistics based on 20 minutes cycle, instant measurements short and adjustable. Size distribution and particle concentration is then obtained from the count curves In an optimization scheme, the parameters are updated such that the difference between the measured and calculated count curve is minimized Differentiates between oil, sand and gas particles FLOW Pipe wall Focal area p8 Mirmorax AS

9 Measurement principle (3) The classified signals (amplitudes) are compared to predictions from the acoustic backscattering model. A mathematical tool is applied to minimize the difference between the measured values and the predicted values. Good fit good results. coun ts oi l amplitud e The result of the minimization scheme is a particle size distribution. Once the particle size distribution has been found the concentration can be calculated. p9 Mirmorax AS

10 Problems, Challenges and Development Ultrasonic transducer manufactured with errors -> causing signal-noise ratio to decline New transducer introduced qualified to 410 Bar by Mirmorax Mechanical design has gone through 2 iterations, 3rd one coming up Data presentation limited by generic GUI -> only 20% of the data presented New GUI developed by Mirmorax p10 Mirmorax AS

11 Mirmorax OiW Graphical User Interface p11 Mirmorax AS

12 OiW measurements vs manual water samples Weekly overview 30 Concentration OiW (mg/l) Week 4 Week 5 Week 6 Week 9 Week 10 Roxar Lab measurement 12 - p12classification: Internal

13 OiW measurments vs manual water samples Daily overview 13 - p13classification: Internal

14 Benefits of Mirmorax ultrasonic technology In-line and on-line: direct measurements in the main flow, hence avoiding side-branch misrepresentation Can withstand high pressure and temperature without effecting measurements -> 690 Bar Acoustic signals propagate through material, hence a fouling layer is acceptable Measure directly the actual particles of oil and sand, directly relating to the ppm requirements p14

15 Subsea Multiphase Sampling Motivation Subsea Multiphase Sampling is a growing interest motivated by the need to calibrate multiphase and wet-gas metering systems as well as getting exact high quality samples supporting reservoir simulations The value of metering systems as well as virtual models for describing flow behavior depends on having a reliable source of reference data The reference data will not only give a very high quality PVT analysis, but also a volumetric representative sample for quantifying oil, gas and water fractions. Having access to this data saves huge infrastructure costs for the operator on test lines and will allow metering systems to be used for fiscal applications, increasing the user vale of existing metering systems p15 CONFIDENTIAL Mirmorax AS

16 The challenge Cost of purchasing and integration of one Multiphase or WetGas meter is approximately 10 Mill Nok Value of the data is when the errors of the meters are within their specification So far, no metering systems are stable over lifetime and no backup solutions available To calibrate meters today, stopping production is needed every time. p16 CONFIDENTIAL Mirmorax AS

17 Areas that are affected by the accuracy of the flow measurements and accuracy of fluid composition Reservoir simulation and field economics Multiphase transport simulation Virtual metering systems Day to day optimization of production Long term programs to enhance oil recovery from the oil fields Flow assurance in respect to scaling and hydrate clogging System integrity with respect to erosion and corrosion rates. Allocation of revenue on tie-in fields and government taxation split. p17 CONFIDENTIAL Mirmorax AS

18 The state of today s technology Main concept used today Hotstab connection Sampling bottles Extraction by differential pressure 3 main sources of inaccuracy Using differential pressure to sample Using differential pressure to transport Dynamic effects due to placement Gives Low quality samples No volumetric representation Low repeatability p18 CONFIDENTIAL Mirmorax AS

19 Limitations of today s technology p19 CONFIDENTIAL Mirmorax AS

20 Use of multiphase sampling will enable.. True volumetric sampling Calibration source for multiphase and wet-gas meters, removing inaccuracy over time Back-up solution for metering systems A highly reliable system interface where sampling of any substance can be obtained through life of field on a per-well basis Fiscal metering with today s technology for tie-ins Quality assurance in subsea processing p20 CONFIDENTIAL Mirmorax AS

21 Operation The multiphase sampling system can be retrieved and replaced This offers the possibilities of either keeping the sampling system installed subsea or moving it around from hub to hub No electrical or hydraulic parts are included in the stationary part, which has dual fail-safe 15 kpsi barriers The system weighs less than 100 kg in water and can be operated by a standard ROV with no extra tooling p21 CONFIDENTIAL Mirmorax AS

22 Operation The sampling bottles can be replaced topside or subsea individually or as part of a cluster In a subsea permanent installation, this makes it possible to replace sampling bottles frequently without disconnecting the sampling system The electronics canister and the hydraulics canister can be replaced subsea or topside, which also enables replacement without retrieving the complete sampling system. All lines to the sampling bottles has dual operational barriers and dual shut off barriers in addition exceeding safety standards of current systems p22 CONFIDENTIAL Mirmorax AS

23 Multiphase metering calibration Step 1: Obtain Gas, oil and water (GOV) fractions from sample over minutes timeframe by direct reading (no PVT lab required) (red dot values on plot) Step 2: Use GOV fractions from sample to update GOV parameter file for the MPFM at the specific timeframe the sample was taken (matching the red dot to the MPFM surface curve) The MPFM will now have a good calibration in the proximity of the red dot Step 3: Use the multiphase sample to obtain high quality PVT. The PVT ill ensure a high accuracy level when the meter moves away from the red dot area and adjust the aspect ratio of the MPFM surface curve Step 4 (Optional): Take more samples under different flow rates to verify tat MPFM surface curve give same values as multiphase sample p23 CONFIDENTIAL Mirmorax AS

24 Accuracy on Multiphase samples The yellow and pink lines are reference value and the blue dots are individual samples with a 1% standard deviation FS p24 CONFIDENTIAL Mirmorax AS

25 Thank you for your attention p25