Alpha VSRD Multiphase Flowmeter

Transcription

1 Alpha VSRD Multiphase Flowmeter Drilling Evaluation Production optimization Artificial lift Control systems Completion Production Flow measurement Custom measurement solutions Multiphase water-cut meter Real-time well testing systems Water-cut meters Wet-gas, modular multiphase meters Reservoir monitoring Software Subsea production Accurate, real-time, multiphase flowmetering Intervention

2 Multiphase metering technology offers improved accuracy and simplified operation. Weatherford s Alpha VSRD is a technological breakthrough in multiphase metering that offers improved accuracy and simplified operation compared to other products on the market. By combining traditional Venturi and gamma densitometer technologies with Weatherford s innovative sonar and Red Eye technologies, the Alpha VSRD excels where other multiphase meters fall short. These key technologies improve flow-rate measurements and dramatically reduce sensitivity to varying fluid properties thereby eliminating the need for frequent recalibrations. For trouble-free wellhead flow measurement or separator replacement, the Alpha VSRD multiphase flowmeter is the right solution. Applications Individual well monitoring. The Alpha VSRD flowmeter provides a cost-effective means of tracking real-time hydrocarbon production data from each well. Test separator replacement. The compact Alpha VSRD multiphase flowmeter is an ideal replacement for bulky test separators, especially for high-pressure or corrosive well streams. Furthermore, because there is no need for purging, well tests can be performed in less time, which translates into more frequent tests of your critical assets. Wet gas or multiphase. Unlike other multiphase meters that cannot operate on high gas wells, the Alpha VSRD meter handles any gas/ liquid ratio. It is a wet-gas and multiphase meter in one. This feature is key for slugging wells that fluctuate between gas-dominant and liquid-dominant flow regimes Weatherford. All rights reserved.

3 Alpha VSRD Multiphase Flowmeter Features The Alpha VSRD flowmeter is fully integrated. The flow computer maintains all fluid and set-up parameters and reports real-time oil, water and gas rates, as well as produced volumes at line or standard conditions. The data are available on the touch pad display and via MODBUS. Low power consumption and high ambient temperature rating make it suitable for solar panel power and desert applications. The meter also includes remote pressure seals on the meter body to reduce the chance of plugging. It is designed for Class I, Zone 1 hazardous locations. Cost effective Robust Large turndown (ratio of maximum-to-minimum flow rate) up to 10:1 Broad operating envelope 2- to 10-in. line sizes Modbus is a registered trademark of Schneider Automation Inc Weatherford. All rights reserved. 3

4 Principle of operation Alpha VSRD is based on an extended-throat Venturi meter, a sonar flowmeter, a Red Eye MP water-cut meter and a gamma densitometer. This combination of technologies has a wide operating envelope and offers maximum accuracy in wet-gas and liquid-dominant multiphase streams. The sonar flowmeter measures the convection of turbulent vortices using an array of dynamic strain sensors. Sonar has the unique capability to measure total flow rate accurately over an extremely wide range of Reynolds numbers (flow rate, fluid types) with a negligible overreading in wet-gas flows. Overreading is the ratio of apparent flow rate to the actual flow rate. The Venturi flowmeter is based on the measurement of static pressure drop across a converging pipe section. The pressure drop is proportional to the increase in kinetic energy of the flow stream, that is conservation of momentum. The Red Eye MP water-cut meter is a filter spectrometer that employs the principle of near-infrared absorption to measure water content in a liquid or multiphase stream. The meter reports accurate water cut independent of flow regime, flow rates, water salinity and hydrate inhibitors. The gamma densitometer uses a small radioactive source and measures the attenuation across the process pipe. The attenuation provides a measure of the gas and liquid content (gas void fraction) in the pipe. The Alpha VSRD combines these four technologies for a robust, full-range multiphase flowmeter for the measurement of gas, oil/condensate and water rates. Pressure Temperature P, T PVT Fluid Properties Venturi Flowmeter Sonar Flowmeter P Velocity Flow Calculations Qt = f( P, VS, FP, G) QI = f(p, FP) Qg= f(p, FP) Liquid and gas Qo = (1 - WLR) x QI flow Qw = WLR x QI rates Qo Qw Qg Gamma Densitometer Density FP = Fluid Properties G = Geometry Red Eye MP Water-Cut Meter Water Cut Sensor processing flow diagram Weatherford. All rights reserved.

5 Alpha VSRD Multiphase Flowmeter Specifications Operating Supply voltage 11 to 30 VDC Power requirement < 30 W Communications interface RS485 Modbus Process temperature, F ( C) 1-4 to 185 (-20 to 85) Communications Host port RS485 serial port supports MODBUS protocol only Local display, in. (cm) 6 (15.24) color touchscreen Mechanical 316/316L stainless steel Material options Duplex Other 2 Nominal pipe sizes 1 2, 3, 4, 6, 8 or 10 Flange style 1 ANSI 600, 900 and 1500 Pressure rating, psi (bar) 1 Up to 3,000 (206.84) Electronics temperature rating, F ( C) Environmental -40 to 158 (-40 to 70) flowmeter 14 to 140 (-10 to 60) flow computer Hazard rating (flowmeter) Class I, Division 1 Material NACE MR0175/ISO Compliance Gamma source Cs-137, 2mCi 1 For other ranges, contact an authorized Weatherford representative. 2 For other materials, contact an authorized Weatherford representative. Performance GVF < 20% 20% < GVF < 90% 90% < GVF < 98% GVF > 98% Gas flow rate relative uncertainty ±10% ±7% ±5% ±5% Gas flow rate repeatability ±0.1% ±0.1% ±0.05% ±0.05% Liquid flow rate relative uncertainty ±5% ±7% ±10% ±75 bpd Liquid flow rate repeatability ±0.05% ±0.1% ±0.1% ±10 bpd GVF < 20% 20% < GVF < 95% 95% < GVF < 98% 98% < GVF < 99.5% Water/liquid ratio absolute uncertainty ±2% ±3% ±4% ±10% Water/liquid ratio absolute repeatability ±0.2% ±0.5% ±1% ±3% 2010 Weatherford. All rights reserved. 5

6 Specifications (continued) Dimensions Typical Alpha VSRD multiphase flowmeter installation Flowmeter Dimensions, in. (cm) Flow Computer Dimensions, in. (cm) A* 36 (91.44) Height (48.58) B* 24 (60.96) Width (40.64) C No minimum requirement Depth (23.81) D No minimum requirement *Approximate dimensions Weatherford. All rights reserved.

7 Alpha VSRD Multiphase Flowmeter Ordering variables Position Choice Code Description A Red Eye MP 1 water-cut meter + gamma densitometer B Process line size 2 RD C Pressure rating 2 P6 D E F G H I Flange type Wetted material Differential pressure Static pressure Power Pressure taps Both required for multiphase metering 2 2 in. 3 3 in. 4 4 in. 6 6 in. 8 8 in in. P9 P15 RF RTJ ANSI 600 equivalent, 1,200-psi (82.74-bar) cold working pressure (CWP) ANSI 900 equivalent, 1,800-psi ( bar) CWP ANSI 1500 equivalent, 3,000-psi ( bar) CWP Raised face Ring-type joint /316L stainless steel (SS) DUP Duplex 1 2 to 200 in. H 2 O 2 10 to 840 in. H 2 O 1 30 to 1,500 psia (2.07 to bara) 2 60 to 3,000 psia (4.14 to bara) 1 11 to 30 VDC to 230 VAC 1 Open 2 Sealed 1 Refer to Red Eye MP water-cut meter brochure for configuration options. 2 For other ranges, contact an authorized Weatherford representative. The model number for the Alpha is built as follows: Alpha VS-A-B-C-D-E-F-G-H-I Example: Alpha VSRD-3-P6-RF would be described as having an integrated spool Red Eye MP water-cut meter, gamma densitometer, a 3-in. line, 1,200-psi (82.74-bar) CWP, raised-face flange, 316/316L stainless steel, 10- to 840-in. H 2 O differential pressure, 30- to 1,500- psia (2.07- to bar) static pressure with 11 to 30 VDC supply power and open-pressure tap lines Weatherford. All rights reserved. 7

8 Alpha VSRD Multiphase Flowmeter Accurate, real-time, multiphase flowmetering Weatherford provides worldwide service and support from more than 900 locations in approximately 100 countries. To find out more about our flow measurement technologies, contact an authorized Weatherford representative or visit weatherford.com. weatherford.com 2010 Weatherford. All rights reserved Weatherford products and services are subject to the Company s standard terms and conditions, available on request or at weatherford.com. For more information contact an authorized Weatherford representative. Unless noted otherwise, trademarks and service marks herein are the property of Weatherford and may be registered in the United States and/or other countries. Weatherford products named herein may be protected by one or more U.S. and/or foreign patents. For more information, contact patents@weatherford.com. Specifications are subject to change without notice. Weatherford sells its products and services in accordance with the terms and conditions set forth in the applicable contract between Weatherford and the client.