1. DUALSTREAM Advanced
Follows the concept of existing Dualstream family - simple, robust, and with corrosion and erosion, hydrates, sand, salinity in mind.
IS more sophisticated solution yet small and compact
Designed to meet the requirements on accuracy and sensitivity across a wide range of GVF ( cover 99% of Gas condensate field requirements) – work in both oil and water continuous flow
AND Reduce the reliance on PVT

2. SISA PLR Wet Gas Algorithm
Flow Computer
PVT
SISA PLR Wet Gas Algorithm
Flow Rate
Gas
Condensate
Water DP PT DP TT
No intrusive sensors
PLR responds to the amount and make up of liquid i.e all water , all condy or mixture of both
Flow
Venturi

3. Gas Rate from Venturi
The DP generated in two phase flow DPTP is larger than the DP that would have been generated in dry gas DPg . A correction is therefore applied.

4. PVT Calculation PVT Calculations Gas Density Composition
Condensate Density
Pressure
CGMR
Temperature
The DP generated in two phase flow DPTP is larger than the DP that would have been generated in dry gas DPg . A correction is therefore applied.
Standard Conditions

5. PLR Calculation PLR measurement quantifies water content.
PLR Saturates at higher liquid levels.

6. PLR Calculation
Suite of curves for different condensate contents

7. DUALSTREAM™ 1 Advanced Calculation
INPUTS (P, T, DP)
PVT (Gas Density and CGMR)
ISO5167
SISA PLR CALCULATION
ITERATION
OUTPUT FLOW RATES (Qg, Qc, Qw)

8. Performance Over 8:1 Turndown
Gas Mass Flow Rate ± 2%
Cond. Mass Flow Rate ± 10% (From PVT)
Water Flow Rate ± 1 am3/h (0-100%WC)
Water Sensitivity ± 0.2 am3/h
* 95% Confidence level 8

9. Project Based Calibration and Validation
Calibration & Validation
SINTEF , CEESI, K Lab
SWRI & NEL
Project Based Calibration and Validation
Many meters and algorithms have been calibrated and validated on projects over many years
On some projects it is not possible to validate meters in the field particularly on subsea projects

10. Independent Wet Gas Trials
NEL wet gas test programme (UK)
Armada Field Trial (UK North Sea) 2000
NEL Wet Gas JIP 2001/2002
Saudi Aramco Wet Gas Trials 2002/3/4
CEESI Wet Gas testing for BP/Chevron 2004
CEESI BP/Shell/Aramco/Anardarco Wet Gas JIP 2009

11. Gas Rate
typically better than ± 2%

12. Water Breakthrough Test
Real time detection of water for wet gas applications can provide a great deal of information for the associated MEG injection
Inhibitor systems can be costly operations
The information generated by a dualstream can be instrumental in adjusting MEG injection flow rates often metered by our seastream flow meters.
Minimising the risk associated with the formation of Hydrates which can potentially block flow lines and can severely impact upon production revenue.

13. Gas Rate Sensitivity

14. Liquid Rate Sensitivity

15. Water Rate Sensitivity

16. Accuracy (Dualstream Advanced against portable test seperator)
Examples of field accuracy
This slide displays the comparison between one of our wet gas flowmeters and a portable test separator.
There is a debate as to which device is the most accurate, however, more importantly there is good agreement between both sets of data.

17. Accuracy (Dualstream Advanced Comparison with Tracer)
Gas Rate Tracer DS1A Deviation WVF
High Flow 1.65sm3/h 1.54sm3/h -0.11sm3/h 0.08%
Med Flow 0.90sm3/h 0.84sm3/h -0.07sm3/h 0.07%
Low Flow 1.39sm3/h 2.17sm3/h +0.78sm3/h 0.37%
Another accuracy comparison of one of our dualstream 1 advanced flowmeters using a Tracer dilution technique.
Once again good agreement was observed between the two sets of results across the standard operating envelope of the flowmeter.
At a very low gas flow rate the descrepancy increased, but the flowmeter was functioning outside of its operating envelope.

18. No Nuclear Source
It’s a hot topic , Nobody wants to use Nuclear sources if they have a choice
Licence
Maintenance
Recalibration
As well as measurement issues
Not required to calibrate on fluids in field
Not effected by salinity
Not effected by drift
DO NOT WORK AT HIGH GVF big issues , we have tried

19. Field Maintenance by Operator
No specialist support
Simplifies commissioning and SAT - TR DO not want to waste time on un proven solutions
Assume TR are into LD’s if meters are late

21. Reliability… Reliable …6 years on
Our philosophy is and has always been to provide uncomplicated trouble free solutions, which are built to withstand the environment for which they are intended.
It’s the same philosophy for topside as well subsea applications, we do not want our meters to require extensive intervention by either the operator or our service team.
For example, A 1500m GoM Wet Gas project.
The flow meter had been installed for around 6 years without intervention, the well depleted and the meter was retrieved for a potential redeployment on a new well.
On inspection the only refurbishment required was to replace cathodic annodes.
…6 years on

22. ‘they have been excellent in supporting us since the installation until now. To be honest I have really not need to call them out I just needed some support over the telephone and/or and they have been very responsive’
Jonathan Rodden Senior Instrumentation & Control System Technical Advisor BP Tangguh LNG Operations Engineering Team BP Indonesia