Micro Motion 3000 9 wire Net Oil Computer Owner's manual

Category
Measuring, testing & control
Type
Owner's manual
ALTUS
â„¢
Net Oil Computer Manual
May 2000
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Netoil_1.bk Page 2 Friday, May 12, 2000 11:02 AM
ALTUS
â„¢
Net Oil Computer Manual
For technical assistance, phone the Micro Motion Customer
Service Department:
• In the U.S.A., phone 1-800-522-6277, 24 hours
• Outside the U.S.A., phone 303-530-8400, 24 hours
• In Europe, phone +31 (0) 318 549 443
• In Asia, phone (65) 770-8155
Copyright ©1998, Micro Motion, Inc. All rights reserved.
Micro Motion, ELITE, and BASIS are registered trademarks, and ALTUS is a
trademark of Micro Motion, Inc., Boulder, Colorado. Hastelloy is a registered
trademark of Haynes International, Inc., Kokomo Indiana. Inconel is a registered
trademark of Inco Alloys International, Inc., Huntington, West Virginia. Teflon is a
registered trademark of E.I. DuPont de Nemours Co., Inc., Wilmington, Delaware.
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Net Oil Computer Manual
i
Contents
1 Before You Begin
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
1
1.1 About this manual . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1
1.2 Application software described in this manual. . . . . . . 1
1.3 Introduction to the ALTUS
â„¢
NOC . . . . . . . . . . . . . . . . 1
Replacing an older NOC and transmitter. . . . . . . . . . . 1
Water cut determination . . . . . . . . . . . . . . . . . . . . . . . 1
NOC capabilities . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2
2 Installation Considerations
. . . . . . . . . . . . . . . . . . . . .
3
2.1 Piping arrangement and ancillary equipment . . . . . . . 3
2.2 Sensor installation. . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
Sensor orientation . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
Avoiding inaccurate flow counts . . . . . . . . . . . . . . . . . 6
2.3 Flow direction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
3 Using the Person-Process Interface
. . . . . . . . . .
9
3.1 Person-Process Interface . . . . . . . . . . . . . . . . . . . . . . 9
3.2 Security button. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
3.3 Function buttons . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
3.4 Cursor control buttons. . . . . . . . . . . . . . . . . . . . . . . . . 12
4 Configuration
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
15
4.1 Recording the configuration. . . . . . . . . . . . . . . . . . . . . 15
4.2 Configuration sequence. . . . . . . . . . . . . . . . . . . . . . . . 15
Step 1 Configure well performance measurements . . . . . . . . 15
Mode of operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16
Units of measurement . . . . . . . . . . . . . . . . . . . . . . . . . 16
Well data-densities . . . . . . . . . . . . . . . . . . . . . . . . . . . 17
Compensations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21
Step 2 Configure system data. . . . . . . . . . . . . . . . . . . . . . . . . 24
Step 3 Configure inputs . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25
Flow variables . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25
Density inputs . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26
Temperature . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27
Sensor calibration data . . . . . . . . . . . . . . . . . . . . . . . . 28
Sensor information . . . . . . . . . . . . . . . . . . . . . . . . . . . 35
Step 4 Configure outputs . . . . . . . . . . . . . . . . . . . . . . . . . . . . 36
Discrete outputs. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 36
Milliamp outputs. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 37
Pulse output. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 40
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5 Using the View Menu
. . . . . . . . . . . . . . . . . . . . . . . . . . .
43
5.1 Accessing the view menu . . . . . . . . . . . . . . . . . . . . . . 43
5.2 Well performance measurements . . . . . . . . . . . . . . . . 44
Continuous mode. . . . . . . . . . . . . . . . . . . . . . . . . . . . . 44
Well test mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 44
5.3 Process totalizers. . . . . . . . . . . . . . . . . . . . . . . . . . . . . 45
5.4 Inventory totalizers. . . . . . . . . . . . . . . . . . . . . . . . . . . . 46
5.5 Active alarm log . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 47
5.6 LCD options . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 47
5.7 Diagnostic monitor . . . . . . . . . . . . . . . . . . . . . . . . . . . . 48
5.8 Applications list . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 48
5.9 Power outage. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 48
6 Continuous Mode
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
49
6.1 Continuous mode configuration . . . . . . . . . . . . . . . . . . 49
6.2 Startup and display test . . . . . . . . . . . . . . . . . . . . . . . . 49
6.3 Process monitor. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 49
6.4 Accessing continuous mode . . . . . . . . . . . . . . . . . . . . 49
6.5 Viewing production measurements . . . . . . . . . . . . . . . 50
6.6 Quick view . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 52
6.7 Pause and resume. . . . . . . . . . . . . . . . . . . . . . . . . . . . 52
6.8 Reset . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 54
7 Well Test Mode
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
55
7.1 Well test mode configuration . . . . . . . . . . . . . . . . . . . . 55
7.2 Startup and display test . . . . . . . . . . . . . . . . . . . . . . . . 55
7.3 Process monitor. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 55
7.4 Accessing well test mode. . . . . . . . . . . . . . . . . . . . . . . 55
7.5 Conducting a well test . . . . . . . . . . . . . . . . . . . . . . . . . 56
7.6 Stopping and continuing a well test . . . . . . . . . . . . . . . 58
7.7 Viewing performance measurements . . . . . . . . . . . . . 60
7.8 Viewing performance measurements for the
current test. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 61
7.9 Viewing previous well tests . . . . . . . . . . . . . . . . . . . . . 63
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Contents
continued
8 Maintenance
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
67
8.1 Alarm messages . . . . . . . . . . . . . . . . . . . . . . . . . . . . 67
Responding to alarms . . . . . . . . . . . . . . . . . . . . . . . . 67
NOC alarm messages. . . . . . . . . . . . . . . . . . . . . . . . 68
Transmitter alarm messages. . . . . . . . . . . . . . . . . . . 68
Alarms that do not generate fault outputs . . . . . . . . . 69
Fault outputs . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 73
Critical status fault alarms . . . . . . . . . . . . . . . . . . . . . 74
Transmitter failure fault alarms . . . . . . . . . . . . . . . . . 74
Fault alarms requiring troubleshooting . . . . . . . . . . . 75
Active alarm log. . . . . . . . . . . . . . . . . . . . . . . . . . . . . 78
8.2 Customer service. . . . . . . . . . . . . . . . . . . . . . . . . . . . 78
8.3 Setting outputs. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 78
Setting discrete outputs. . . . . . . . . . . . . . . . . . . . . . . 79
Setting milliamp outputs . . . . . . . . . . . . . . . . . . . . . . 79
Setting the frequency output . . . . . . . . . . . . . . . . . . . 80
8.4 Density calibration. . . . . . . . . . . . . . . . . . . . . . . . . . . 80
Density unit for calibration. . . . . . . . . . . . . . . . . . . . . 80
Duplicating the factory calibration . . . . . . . . . . . . . . . 81
Duplicating a previous calibration . . . . . . . . . . . . . . . 82
Two-point density calibration. . . . . . . . . . . . . . . . . . . 83
9 Laboratory Determination of Dry Oil and
Produced Water Densities
. . . . . . . . . . . . . . . . .
87
9.1 Reasons for using live oil density . . . . . . . . . . . . . . . 87
9.2 Laboratory density measurement . . . . . . . . . . . . . . . 87
Taking a sample from the flow line . . . . . . . . . . . . . . 88
Processing sample and measuring densities . . . . . . 91
10In-Line Determination of Live Oil and
Produced Water Densities
. . . . . . . . . . . . . . . . .
93
10.1 Reasons for using live oil density . . . . . . . . . . . . . . . 93
10.2 In-line density determination . . . . . . . . . . . . . . . . . . . 93
Density determination procedures. . . . . . . . . . . . . . . 93
Measuring and saving the water density . . . . . . . . . . 94
Manually entering the water density . . . . . . . . . . . . . 99
Measuring and saving the oil density . . . . . . . . . . . . 103
Entering the water cut . . . . . . . . . . . . . . . . . . . . . . . . 104
11Sensitivity Analysis
. . . . . . . . . . . . . . . . . . . . . . . . . . . .
107
11.1 Error factors. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 107
11.2 Individual sensitivity. . . . . . . . . . . . . . . . . . . . . . . . . . 107
11.3 Overall uncertainty. . . . . . . . . . . . . . . . . . . . . . . . . . . 108
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12Software Diagrams
. . . . . . . . . . . . . . . . . . . . . . . . . . .
111
12.1 View menu in well test mode . . . . . . . . . . . . . . . . . . 111
12.2 View menu in continuous mode. . . . . . . . . . . . . . . . 112
12.3 Configuration menu . . . . . . . . . . . . . . . . . . . . . . . . . 113
12.4 Maintenance menu . . . . . . . . . . . . . . . . . . . . . . . . . 115
Appendixes
Appendix A ALTUS
â„¢
NOC Software Configuration
Record . . . . . . . . . . . . . . . . . . . . . . . . . . . . 117
Appendix B Return Policy . . . . . . . . . . . . . . . . . . . . . . . . . . . 121
Index
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
123
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Figures
Figure 1-1 Water cut calculation. . . . . . . . . . . . . . . . . . . . . . . . 2
Figure 2-1 Typical installation, Micro Motion
®
sensor and
NOC with 3-phase separator . . . . . . . . . . . . . . . 4
Figure 2-2 Typical installation, Micro Motion
®
sensor and
NOC with 2-phase separator . . . . . . . . . . . . . . . 4
Figure 2-3 Sensor in horizontal pipe run,
tubes downward . . . . . . . . . . . . . . . . . . . . . . . . . 5
Figure 2-4 Sensor in vertical pipe run. . . . . . . . . . . . . . . . . . . . 5
Figure 3-1 Person-Process Interface . . . . . . . . . . . . . . . . . . . . 9
Figure 3-2 Pressing security button, security disabled. . . . . . . 10
Figure 3-3 Pressing security button, security enabled . . . . . . . 10
Figure 3-4 Function buttons . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
Figure 3-5 Cursor control buttons. . . . . . . . . . . . . . . . . . . . . . . 13
Figure 4-1 Effect of transient bubbles on density . . . . . . . . . . . 22
Figure 4-2 Holding at last measured density . . . . . . . . . . . . . . 22
Figure 4-3 Correction of density readings . . . . . . . . . . . . . . . . 22
Figure 4-4 Flow calibration values on sensor serial
number tag . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29
Figure 4-5 D1 and D2 on sensor serial number tag . . . . . . . . . 30
Figure 4-6 K1 and K2 on sensor serial number tag . . . . . . . . . 31
Figure 4-7 K1 and K2 values from comments section . . . . . . . 32
Figure 4-8 K1 and K2 values from second page . . . . . . . . . . . 32
Figure 4-9 FD and dens temp coeff on sensor serial
number tag . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 33
Figure 5-1 Using buttons in the view menu . . . . . . . . . . . . . . . 43
Figure 6-1 Process monitor mode . . . . . . . . . . . . . . . . . . . . . . 49
Figure 7-1 Process monitor mode . . . . . . . . . . . . . . . . . . . . . . 55
Figure 8-1 Model 3500 sensor wiring terminals . . . . . . . . . . . . 76
Figure 8-2 Model 3700 sensor wiring terminals . . . . . . . . . . . . 76
Figure 9-1 Sample port for laboratory density
measurement . . . . . . . . . . . . . . . . . . . . . . . . . . . 88
Figure 9-2 Laboratory sampling procedure using
water-filled cylinder. . . . . . . . . . . . . . . . . . . . . . . 89
Figure 9-3 Laboratory sampling procedure using
empty cylinder. . . . . . . . . . . . . . . . . . . . . . . . . . . 90
Figure 9-4 Laboratory density measurement system,
low pressure . . . . . . . . . . . . . . . . . . . . . . . . . . . . 92
Figure 9-5 Laboratory density measurement system,
high pressure . . . . . . . . . . . . . . . . . . . . . . . . . . . 92
Figure 10-1 Stratification with no flow. . . . . . . . . . . . . . . . . . . . . 96
Figure 10-2 Diameter and length of cylindrical vessel . . . . . . . . 97
Figure 10-3 Taking a water sample from the separator . . . . . . . 101
Figure 10-4 Using a hygrometer to measure water density . . . . 101
Figure 10-5 Taking an oil sample . . . . . . . . . . . . . . . . . . . . . . . . 103
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Tables
Table 4-1 Densities and deviations for continuous mode . . . . 18
Table 4-2 Well data for well test mode. . . . . . . . . . . . . . . . . . . 21
Table 4-3 Transient bubble remediation parameters. . . . . . . . 23
Table 4-4 System parameters . . . . . . . . . . . . . . . . . . . . . . . . . 24
Table 4-5 Flow variables . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25
Table 4-6 Density inputs . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26
Table 4-7 Temperature inputs . . . . . . . . . . . . . . . . . . . . . . . . . 27
Table 4-8 Flow calibration values . . . . . . . . . . . . . . . . . . . . . . 29
Table 4-9 D1 and D2 density values . . . . . . . . . . . . . . . . . . . . 30
Table 4-10 K1 and K2 tube period values . . . . . . . . . . . . . . . . . 31
Table 4-11 FD and dens temp coeff values. . . . . . . . . . . . . . . . 33
Table 4-12 Nominal FD values for sensors . . . . . . . . . . . . . . . . 34
Table 4-13 Temperature calibration values . . . . . . . . . . . . . . . . 35
Table 4-14 Sensor information variables. . . . . . . . . . . . . . . . . . 35
Table 4-15 Discrete output 1 power sources. . . . . . . . . . . . . . . 36
Table 4-16 Discrete output assignment variables . . . . . . . . . . . 36
Table 4-17 Fault conditions and settings for
milliamp outputs . . . . . . . . . . . . . . . . . . . . . . . . . 37
Table 4-18 Process variables for milliamp outputs . . . . . . . . . . 38
Table 4-19 Calibration span variables . . . . . . . . . . . . . . . . . . . . 39
Table 4-20 Pulse output variables . . . . . . . . . . . . . . . . . . . . . . . 40
Table 6-1 Continuous production measurements . . . . . . . . . . 51
Table 7-1 Performance measurements for
current well test. . . . . . . . . . . . . . . . . . . . . . . . . . 62
Table 7-2 Performance measurements for
previous well tests. . . . . . . . . . . . . . . . . . . . . . . . 65
Table 8-1 Using NOC alarms. . . . . . . . . . . . . . . . . . . . . . . . . . 68
Table 8-2 Using slug flow alarms. . . . . . . . . . . . . . . . . . . . . . . 69
Table 8-3 Using output saturation alarms . . . . . . . . . . . . . . . . 70
Table 8-4 Using totalizer alarms . . . . . . . . . . . . . . . . . . . . . . . 70
Table 8-5 Using calibration and trim alarms . . . . . . . . . . . . . . 71
Table 8-6 Using conditional status alarms. . . . . . . . . . . . . . . . 72
Table 8-7 Fault output levels . . . . . . . . . . . . . . . . . . . . . . . . . . 73
Table 8-8 Configurations for fault outputs . . . . . . . . . . . . . . . . 73
Table 8-9 Using critical status fault alarms . . . . . . . . . . . . . . . 74
Table 8-10 Using transmitter failure fault alarms. . . . . . . . . . . . 74
Table 8-11 Troubleshooting excessive drive gain . . . . . . . . . . . 75
Table 8-12 Nominal resistance ranges for
flowmeter circuits. . . . . . . . . . . . . . . . . . . . . . . . . 77
Table 8-13 Troubleshooting sensor error fault alarms. . . . . . . . 77
Table 8-14 Density of air in grams per cubic centimeter . . . . . . 84
Table 8-15 Maximum flow rates for high-density
calibration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 85
Table 8-16 Density of water. . . . . . . . . . . . . . . . . . . . . . . . . . . 86
Table 9-1 Laboratory equipment for determining live oil
and produced water densities . . . . . . . . . . . . . . 87
Table 10-1 Approximate capacity of cylindrical vessels. . . . . . 97
Table 10-2 Approximate capacity of spherical ends . . . . . . . . 97
Table 11-1 Uncertainty factors for percent water cut and
percent net oil . . . . . . . . . . . . . . . . . . . . . . . . . . 107
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Configuration Using the View Menu Continuous ModeBefore You Begin Installation Considerations
Using the Person-Process
Interface
1 Before You Begin
1.1 About this manual
This manual explains how to configure, operate, and maintain the
ALTUS
â„¢
Net Oil Computer (NOC). This manual does not explain
installation or wiring. For information about installation and wiring, see
the
ALTUS Installation Manual
.
1.2 Application software
described in this manual
This manual pertains to software menus that enable operation,
configuration, and maintenance of the NOC.
• The ALTUS applications platform has software functions that do not
pertain to the NOC.
• For information about software functions that are not described in
this manual, refer to the installation and detailed setup manuals for
the applications platform.
1.3 Introduction to the ALTUS
â„¢
NOC
The ALTUS NOC works with a Micro Motion
®
sensor to produce real-
time measurements of water cut, net oil volume flow, and net water
volume flow. The NOC measures full-stream mass flow and volumetric
flow at rates from a few barrels to more than 100,000 barrels per day.
Replacing an older NOC
and transmitter
If an ALTUS NOC is installed as a replacement for an older Micro Motion
Net Oil Computer and RFT9739 or RFT9712 transmitter, power-supply
and output wiring does not need to be replaced. Because transmitter
software is included with the ALTUS NOC, a transmitter is not required.
Water cut determination
The NOC calculates water cut from the following equation:
Where
:
D
e
= Emulsion density
D
o
= Oil density
D
w
= Water density
Figure 1-1
, page 2, shows how water cut is calculated by the NOC. The
operator enters the oil and water densities at the reference temperature
(60°F in
Figure 1-1
). The Micro Motion sensor measures the fluid
temperature (100°F in
Figure 1-1
). The NOC extrapolates the densities
to the operating temperature, using an API equation for oil and a
Chevron Research equation for produced water. The water cut equation
is solved at operating temperature, then referenced back to 60°F. Using
water cut, mass flow rate, and net oil and water densities, the NOC
calculates net oil, net water, and gross flow at reference temperature.
Water cut
D
e
D
o
–
D
w
D
o
–
---------------------=
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Figure 1-1. Water cut calculation
NOC capabilities
The NOC can operate in continuous mode or well test mode:
• In continuous mode, the NOC can continuously monitor a well,
separator, or pipeline.
• In well test mode, the NOC can perform a well test on any of up to 48
different wells. Well performance data for the test that is in progress
or for previous tests can be viewed during the test.
The NOC nonvolatile memory archives data acquired during the last
three well tests. The NOC resumes testing if a power failure or shutoff
interrupts the test that is in progress. The last three power outages are
recorded with power-on and power-off time/date stamps.
The NOC has three discrete outputs, two milliamp outputs, and a pulse
output:
• Discrete output 1 can be an alarm for transient bubble remediation.
• Discrete output 2 indicates net oil. It produces 10 output pulses per
barrel or 10 output pulses per cubic meter of net oil.
• Discrete output 3 indicates net water. It produces 10 output pulses
per barrel or 10 output pulses per cubic meter of net water.
• Milliamp output 1 can indicate any measured variable.
• Milliamp output 2 can indicate any measured variable.
• The pulse output can represent a flow variable.
The NOC can remediate density readings to compensate for the
presence of transient bubbles in the sensor. If erratic density resulting
from transient bubbles causes sensor drive gain to exceed the
programmed value, the NOC can be programmed to respond in one of
three ways:
• The NOC can hold the density value that was measured at a
specified time before transient bubbles were detected.
• The NOC can produce an alarm indicating the presence of transient
bubbles. The alarm can be assigned to discrete output 1.
• The NOC can stop the well test that is in progress.
Water cut
D
e
D
o
–
D
w
D
o
–
---------------------=
Produced water density
Crude oil density
Temperature (°F)
60° 90°
100°
120° 150°
1.05
1.00
0.95
0.90
0.85
0.80
0.75
0.70
Density (g/cc)
Produced water density entered in NOC
Crude oil density entered in NOC
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3
Configuration Using the View Menu Continuous ModeBefore You Begin Installation Considerations
Using the Person-Process
Interface
2 Installation Considerations
2.1 Piping arrangement and
ancillary equipment
Figure 2-1
, page 4, shows a typical installation of a sensor and an NOC
when a 3-phase test separator is used.
Figure 2-2
, page 4, shows a typical installation of a sensor and an NOC
when a 2-phase test separator is used.
Adhere to the following general guidelines:
• Design and size the test separator to ensure complete separation of
the entrained gas from the liquid phase.
• Size the Coriolis sensor so that at maximum liquid flow, pressure
drop is less than 3 psi.
• Install the sensor as far below the test separator as possible.
•
Install the sensor upstream from the dump valve
.
• Balance any sensor pressure drop with hydrostatic head, measured
from the lowest level in the separator down to the sensor inlet. Rule
of thumb: pressure drop should be about 0.4 psi per foot.
• If the liquid temperature is significantly different from the ambient
temperature, thermally insulate or heat trace the sensor and
upstream pipe to minimize paraffin coating and transient temperature
at the start of dumping periods.
• Install a meter proving loop, if required.
• Install a static mixer and sampling port for calibration and verification
purposes. Locate the static mixer and sampling port downstream
from the sensor and the proving loop connections.
• Make sure the dump valve is capable of regulating back pressure
and controlling the liquid flow rate.
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Installation Considerations
continued
Figure 2-1. Typical installation, Micro Motion
®
sensor and NOC with 3-phase separator
Figure 2-2. Typical installation, Micro Motion
®
sensor and NOC with 2-phase separator
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Installation Considerations
continued
Configuration Using the View Menu Continuous ModeBefore You Begin Installation Considerations
Using the Person-Process
Interface
2.2 Sensor installation
Install the sensor according to the appropriate sensor instruction
manual.
Sensor orientation
If possible, mount the sensor with its flow tubes downward in a
horizontal pipe run, as shown in
Figure 2-3
.
If necessary to prevent sand or other solid particles from accumulating
in the flow tubes, or to accommodate existing vertical piping, mount the
sensor in a vertical pipe run, as shown in
Figure 2-4
. The oil/water
interface should flow upward through the pipeline.
Figure 2-3. Sensor in horizontal pipe run, tubes downward
Figure 2-4. Sensor in vertical pipe run
Flow direction
Flow direction
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Installation Considerations
continued
Avoiding inaccurate flow
counts
Because the crude oil in the separator is at an equilibrium condition, any
pressure reduction can cause the solution gas (i.e., the light end
components) to break out from the saturated crude oil.
Even a seemingly small amount of free gas in the liquid phase can result
in substantial measurement errors in water cut and net oil. (See pages
107-109 to estimate the effect of free gas).
The amount of gas that is produced varies, and depends on the
properties of the crude oil and the operating conditions.
To prevent formation of solution gas in the flowmeter, the following
criterion should be followed:
Where:
P
g
= Static head pressure of liquid, measured from liquid level at
separator to sensor inlet
P
p
= Frictional pressure loss of flow line, from test separator to
sensor inlet
P
m
= Pressure drop across sensor
Detailed pressure drop calculations are strongly recommended during
design and installation of the piping system.
CAUTION
Settling of the oil/water interface in a sensor can
cause the flowmeter to indicate flow when there is no
flow.
• To avoid inaccurate flow counts, program a low flow
cutoff. To program a low flow cutoff, see page 25.
• Settling of the oil/water interface is more likely to occur if
the sensor is mounted in a vertical pipe run than if the
sensor is mounted in a horizontal pipe run.
P
g
P
p
P
m
+
>
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Installation Considerations
continued
Configuration Using the View Menu Continuous ModeBefore You Begin Installation Considerations
Using the Person-Process
Interface
The following general guidelines are suggested:
• To maximize the static head gain (P
g
), install the sensor as far below
the test separator as possible.
• Note that 1 psi (6.9 kPa) of static head gain results from 28 inches of
water column.
• To minimize the frictional head loss (P
p
), install the sensor as near as
possible to the test separator, and use larger-diameter connecting
pipes. Minimize use of piping elements such as tees, elbows, and
reducing unions.
• Install sampling ports, static mixer, proving connections, dump valve,
back pressure regulator, or other flow-restricting devices downstream
from the sensor. A full-port valve should be considered if a cutoff
valve must be installed between the separator and the sensor.
• Whenever possible, frictional pressure loss should be less than 3 psi
(20.7 kPa) at the maximum anticipated flow rate.
• To minimize pressure drop across the sensor (P
m
), install a larger
sensor. Pressure drop across the sensor should be less than 3 psi
(20.7 kPa) at the maximum anticipated flow rate.
• In some environments, extremely tight emulsion occurs. Extremely
tight emulsion can make removal of entrained gas difficult, even with
a large separator. Using a suitable demulsifier chemical to break
down the emulsion is a possible method of alleviating this problem.
If the sensor is installed directly at the wellhead, (i.e., if a test separator
is not used), the line pressure at the sensor should be maintained above
the crude oil bubble point pressure.
2.3 Flow direction
The sensor measures accurately regardless of flow direction. The arrow
on the sensor housing indicates normal forward flow direction. Refer to
the
ALTUS Detailed Setup Manual
for directions about setting the NOC
to indicate forward flow, reverse flow, or forward and reverse flow.
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Configuration Using the View Menu Continuous ModeBefore You Begin Installation Considerations
Using the Person-Process
Interface
3 Using the Person-Process
Interface
3.1 Person-Process Interface
Figure 3-1
shows the Person-Process Interface. Use the interface to:
• Configure the NOC
• Monitor and control the application
• Perform maintenance and diagnostic tasks
Figure 3-1. Person-Process Interface
Cursor control
buttons
Security button
Backlit
display
Function buttons
DEVICE 1
Volume Flow
4,352.33
bpd
Volume Total
56,485.88
bbl
NEXT PRINT VIEW
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Using the Person-Process Interface
continued
3.2 Security button
The security button is in the lower right of the interface, marked by an
icon of a padlock.
• If security is disabled, press the security button to access the main
menu. See
Figure 3-2
.
• If security has been enabled, you will be prompted to enter a
password. See
Figure 3-3
.
• To enable security, see the
ALTUS Detailed Setup Manual
.
You can use the security button to return to the main menu or password
entry screen. Press the security button once to return to:
• The main menu, shown in
Figure 3-2
, if security is disabled
• The password entry screen, shown in
Figure 3-3
, if security is
enabled
At the main menu or password entry screen, press EXIT to return to the
operation screen.
Figure 3-2. Pressing security button, security disabled
Figure 3-3. Pressing security button, security enabled
DEVICE 1
Volume Flow
4,532.33
bpd
Mass Total
56,485.88
bbl
NEXT PRINT VIEW
DEVICE 1
Configuration
Maintenance
Security
Language
SEL HELP EXIT
DEVICE 1
Volume Flow
4,532.33
bpd
Mass Total
56,485.88
bbl
NEXT PRINT VIEW
Enter Password
SEL HELP EXIT
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Micro Motion 3000 9 wire Net Oil Computer Owner's manual

Category
Measuring, testing & control
Type
Owner's manual

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