Rohrback Cosasco Systems, Inc.

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Field: Major Offshore Development
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Five remote wellhead platforms, a floating production, storage and offloading (FPSO) vessel, and riser utility platform (RUP)
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Production: 190,000 bpd of oil and 510,000 bpd total fluids

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Problem:
Corrosion and Erosion caused by corrosive factors
(i.e chemical) and erosive factors (i.e. sand) in oil and produced liquids
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Solution:
Continuous, on-line corrosion/erosion monitoring system including transmitters, probes, coupons, access & retrieval equipment, communication equipment, corrosion server and software

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Online System consists of 142 monitoring points
– A combination of 95 Quicksand™ and Microcor ®
Transmitters with corrosion probes/biological probes
– 47 Coupons (weight-loss) monitoring points, including coupon holders
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Cosasco ® Access System containing RSL Retrievers, access fitting assemblies, and service valve kits.
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ICMS3™, data retrieval and management system, corrosion server and software

With Quicksand Transmitters in exactly the same configuration as a
Microcor Transmitter, a comprehensive corrosion/erosion monitoring solution is established.

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High resolution monitoring
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Rapid response
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Immediate alerts to process upsets
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Real-time data
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A single cable can connect up to 32 transmitters with a single cable run
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Integrated corrosion/erosion system measures rates from both corrosive and erosive factors
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Delivery of information enables corrosion/erosion rates to be integrated and used as process parameters

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The probability of sand erosion has increased with advances in horizontal well drilling
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Velocities can exceed over 100 ft/sec causing an increase in the occurrence of sand erosion
 Sand at high velocities produces a “sandpaper” effect, scraping away layers of protective coatings and metal

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Elbows and bends are more vulnerable
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Former methods of erosion monitoring (i.e. coupons, ultrasonics) were inadequate because of the lack of distinction between erosion and erosion-corrosion

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High sensitivity transmitters and sand probes for real time monitoring
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Seamlessly integrates with Microcor online and data-logging system
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Two probe types
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Cylindrical – suitable for severe flow or high temperature applications
 Angled – exposed to the flow at a 45° angle

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S4500 Probe
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Rugged, all welded cylindrical element
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Specially designed element support shield, suitable for severe flow or high temperature applications
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S4700 Probe
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45° element simulates change in direction in pipe
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Maximum temperature is 400°F
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Recommended for flow rates less than 25 ft/sec

Quicksand™ offers real time detection of sand erosion
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EFFECTIVE SENSING ELEMENT THICKNESS = 10 MILS
20 40 60 80 100 120 140 160 180 200

0.00
Metal Loss
-0.05
-0.10
-0.15
-0.20
Sep 2003
1 Mon 8 Mon 15 Mon 22 Mon
-0.188 9/17/2003 1:35:17 PM
Mark 1: -0.188 Mark 2: -0.018 Slope: 6.28 mpy
1 Wed

A sand probe is positioned middle-of-the-line where velocity of flowing sand is greatest

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RCS provides a comprehensive erosion/corrosion monitoring system using the latest technology
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Advantages of Erosion/Corrosion Monitoring System
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Real time data and immediate alerts to process upsets so that proper action can be taken to prevent further damage
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Measures rates from both erosive and corrosive factors
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Rugged design allows for use in severe flow and high temperature environments
 Rapid detection of low erosion/corrosion in systems with little or no corrosion allowance
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Saves you money by saving you time