Transcript High Resolution Corrosion/Erosion Monitoring

Rohrback Cosasco Systems, Inc.
High Resolution
Corrosion/Erosion Monitoring
Project
 Field: Major Offshore Development
 Five remote wellhead platforms, a floating production,
storage and offloading (FPSO) vessel, and riser utility
platform (RUP)
 Production: 190,000 bpd of oil and 510,000 bpd total
fluids
Background
 Problem:
Corrosion and Erosion caused by corrosive factors
(i.e chemical) and erosive factors (i.e. sand) in oil and
produced liquids
 Solution:
Continuous, on-line corrosion/erosion monitoring
system including transmitters, probes, coupons,
access & retrieval equipment, communication
equipment, corrosion server and software
System Configuration
 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
 Cosasco® Access System containing RSL Retrievers,
access fitting assemblies, and service valve kits.
 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.
Advantages of Continuous, On-line
Corrosion/Erosion System
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High resolution monitoring
Rapid response
Immediate alerts to process upsets
Real-time data
A single cable can connect up to 32 transmitters with
a single cable run
 Integrated corrosion/erosion system measures rates
from both corrosive and erosive factors
 Delivery of information enables corrosion/erosion
rates to be integrated and used as process parameters
Sand Erosion
 The probability of sand erosion has increased
with advances in horizontal well drilling
 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
 Elbows and bends are more vulnerable
 Former methods of erosion monitoring (i.e.
coupons, ultrasonics) were inadequate because
of the lack of distinction between erosion and
erosion-corrosion
Quicksand™
 High sensitivity transmitters and
sand probes for real time monitoring
 Seamlessly integrates with Microcor
online and data-logging system
 Two probe types
 Cylindrical – suitable for severe flow or
high temperature applications
 Angled – exposed to the flow at a 45°
angle
 S4500 Probe
 Rugged, all welded cylindrical element
 Specially designed element support shield,
suitable for severe flow or high temperature
applications
 S4700 Probe
 45° element simulates change in
direction in pipe
 Maximum temperature is 400°F
 Recommended for flow rates less
than 25 ft/sec
Quicksand™ offers real time detection of sand erosion
Detection Time Vs. Erosion Rate
Detection
Time Vs. Erosion Rate
28.0
EFFECTIVE SENSING ELEMENT THICKNESS = 10 MILS
26.0
24.0
(Minutes)
Time(Minutes)
Detection
Detection Time
22.0
20.0
18.0
16.0
14.0
12.0
10.0
8.0
6.0
4.0
2.0
0.0
0
20
40
60
80
100
Erosion Rate (MPY)
120
Erosion Rate (MPY)
140
160
180
200
Actual Data Showing a Corrosion Upset
Metal Loss
0.00
mils
-0.05
-0.10
-0.15
-0.20
1 Mon
Sep 2003
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
How the Quicksand System Works
A sand probe is positioned
middle-of-the-line
where velocity of flowing
sand is greatest
Summary
 RCS provides a comprehensive erosion/corrosion
monitoring system using the latest technology
 Advantages of Erosion/Corrosion Monitoring System
 Real time data and immediate alerts to process upsets so that
proper action can be taken to prevent further damage
 Measures rates from both erosive and corrosive factors
 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
 Saves you money by saving you time