About the Gas analysis tab on the Gas quality data editor

E

A Y indicates that an event has been recorded for the GQ record.

M

A Y indicates that the data has been modified. If the cell is colored with the Invalid Data Status Color, it indicates that the data is invalid. For more information, refer to Data status colors.

Date Time

The date/time stamp for the start of the flow period. The time zone can be either Host or Field, based on your selection in the User Options System Preferences tab.

Whether you have selected the time zone for the Host or the Field as your preference dictates how the time information will be displayed in the Gas Quality Data Editor window. For example, if it is 09:00 A.M. in the field time zone but 08:00 A.M. in the host time zone, and Host has been selected as the chosen time zone, the times displayed will reflect that of the host time zone.

The date/time can be colored to indicate that an Audit History or an outstanding Prior Period Adjustment (PPA) record exists. Double-click the colored date/time to access the Audit History window or the Pending PPAs window.

Observed

The Observed checkbox provides the current state of the information:

• An Edit State of Observed indicates that the data has been measured in the field. When data is being entered for the first time, you select the Observed checkbox.

• If the Observed checkbox is not selected, the data will be given an state of User Estimated. This means that data from the field is not available. The values that appear should be considered temporary data, to be used only until the real data arrives.

Thermal Calc.

Provides the Thermal Calculation method selected for use with the Gas Quality record.

Source

Provides the source of the Gas Quality information.

HV

This column displays the gross heating value based on a real gas volume (adjusted for compressibility). The units used to display the information can be configured in User Options.

HV Ideal

This column displays the ideal gross heating value information (not adjusted for compressibility). The units used to display the information can be configured in User Options.

SG

This column displays real specific gravity information. The pressure and temperature basis for the calculation is 14.73 PSIA and 60ºF. This value is unitless, and not subject to changes in the Unit Profile, as the units are provided by the GPS Calculation unit settings.

SG Ideal

This column displays ideal specific gravity information. This value is unitless, and not subject to changes in the Unit Profile, as the units are provided by the GPS Calculation unit settings.

Total Comp.

This column displays the Total Composition. The units used to display the information can be configured in the User Options.

CO2 + N2

This column displays the carbon dioxide and nitrogen values. The units used to display the information can be configured in the User Options.

CO2

This column displays the carbon dioxide information. The units used to display the information can be configured in the User Options.

N2

This column displays information about the nitrogen content. The units used to display the information can be configured in the User Options.

H2

This column displays information about the hydrogen content. The units used to display the information can be configured in the User Options.

S2

This column displays information about the sulphur content. The units used to display the information can be configured in the User Options.

O2

This column displays information about the oxygen content. The units used to display the information can be configured in the User Options.

CO

This column displays information about the carbon monoxide content. The units used to display the information can be configured in the User Options.

Ar

This column displays information about the Argon content. The units used to display the information can be configured in the User Options.

He

This column displays information about the Helium content. The units used to display the information can be configured in the User Options.

H2S

This column displays information about the Hydrogen Sulfide content. The units used to display the information can be configured in the User Options.

H2O

This column displays information about the water content. The units used to display the information can be configured in the User Options.

WVCF

This column displays information about the water vapor correction factor. The units used to display the information can be configured in the User Options.

C1

This column displays information about the methane content. The units used to display the information can be configured in the User Options.

C2

This column displays information about the ethane content. The units used to display the information can be configured in the User Options.

C3

This column displays information about the propane content. The units used to display the information can be configured in the User Options.

iC4

This column displays information about the Iso-Butane content. The units used to display the information can be configured in the User Options.

nC4

This column displays information about the N-Butane content. The units used to display the information can be configured in the User Options.

iC5

This column displays information about the Iso-Pentane content. The units used to display the information can be configured in the User Options.

nC5

This column displays information about the N-Pentane content. The units used to display the information can be configured in the User Options.

neoC5

This column displays information about the Neo Pentane content. The units used to display the information can be configured in the User Options.

C5+ Gas Comp.

This column displays information about the C5+ Gas Composition. The units used to display the information can be configured in the User Options.

C6+

This column displays information about the components for C6 and above. The units used to display the information can be configured in the User Options. For more information about C6+ spreading, refer to Gas quality tab / Analysis component spreading / Spread Cplus enabled.

C6

This column displays information about the Hexane content. The units used to display the information can be configured in the User Options. For more information about C6+ spreading, refer to Gas quality tab / Analysis component spreading / Spread Cplus enabled.

C7

This column displays information about Heptane content. The units used to display the information can be configured in the User Options. For more information about C6+ spreading, refer to Gas quality tab / Analysis component spreading / Spread Cplus enabled.

C8

This column displays information about Octane content. The units used to display the information can be configured in User Options. For more information about C6+ spreading, refer to Gas quality tab / Analysis component spreading / Spread Cplus enabled.

C9

This column displays information about Nonane content. The units used to display the information can be configured in User Options. For more information about C6+ spreading, refer to Gas quality tab / Analysis component spreading / Spread Cplus enabled.

C10

This column displays information about Decane content. The units used to display the information can be configured in User Options. For more information about C6+ spreading, Gas quality tab / Analysis component spreading / Spread Cplus enabled

H20 DP

This column displays information about the water dewpoint information. The units used to display the information can be configured in the User Options.

Density

This column displays density information. The units used to display the information can be configured in User Options.

Viscosity

This column displays information about the viscosity. The units used to display the information can be configured in the User Options.

BSW

This column displays information about the base sediment and water content. The units used to display the information can be configured in the User Options.

Cricondentherm

This column displays information about the Cricodentherm. The units used to display the information can be configured in the User Options.

Total Sulphur

This column displays information about the total sulphur. The units used to display the information can be configured in the User Options.

Wobbe

The Wobbe Index quantifies the interchangeability of gasses better than heating value or specific gravity. It is defined as:

The Wobbe Index is calculated based on the BTU (60) heating value. This is defined as unitless in AVEVA Measurement Advisor and will not have unit conversion applied to it when you change the unit profile.

Z Ratio

When converting a volume from one base conditions to another, the ideal gas law is used (PV = nRT). AVEVA Measurement Advisor gives the option to configure a single alternate set of base conditions that will use the real gas law for the conversion instead (PV = ZnRT). When this is configured, the Z ratio is calculated as the compressibility factor to convert between the specified base conditions and the standard base conditions (14.73 PSI/60ºF). The Z ratio is considered unitless.

Ethylene

This column displays the amount of Ethylene in the product.The units used to display the information can be configured in the User Options.

Note: This column is only used by meters that are connected to this gas analysis that are using API 14.4 to calculate a volume.

Propylene

This column displays the amount of propylene in the product. The units used to display the information can be configured in the User Options.

Note: This column is only used by meters that are connected to this gas analysis that are using API 14.4 to calculate a volume.

Propadiene

This column displays the amount of propadiene in the product. The units used to display the information can be configured in the User Options.

Note: This column is only used by meters that are connected to this gas analysis that are using API 14.4 to calculate a volume.

Butene

This column displays the amount of butene in the product. The units used to display the information can be configured in the User Options.

Note: This column is only used by meters that are connected to this gas analysis that are using API 14.4 to calculate a volume.

COS

The amount of Carbonyl Sulfide in the fluid. The units used to display the information can be configured in the User Options.

Note: This field is sent to the RealTime database and is shown in the Gas Quality Data Editor but is not part of any calculation and will not be recalculated when other fields change.

Mercaptans

The amount of Mercaptan sulphur in the fluid. The units used to display the information can be configured in the User Options.

Note: This field is sent to the RealTime database and is shown in the Gas Quality Data Editor but is not part of any calculation and will not be recalculated when other fields change.

Supercompressibility

The supercompressibility factor Fpv is used to calculate volumes at standard conditions from the actual measured volumes. Fpv is unitless.

Note: This field is sent to the RealTime database and is shown in the Gas Quality Data Editor but is not part of any calculation and will not be recalculated when other fields change.

Unnormalized Total

The unnormalized total composition from the field. The units used to display the information can be configured in the User Options.

Note: This field is sent to the RealTime database and is shown in the Gas Quality Data Editor but is not part of any calculation and will not be recalculated when other fields change.

Mole Total

The normalized total composition from the field. The units used to display the information can be configured in the User Options.

Note: This field is sent to the RealTime database and is shown in the Gas Quality Data Editor but is not part of any calculation and will not be recalculated when other fields change.

Sample Time

This column indicates the time when the sample was taken. It is possible to edit the sample time by selecting the associated cell.

In the GQ Properties, it is possible to define how AVEVA Measurement Advisor displays the sample time information. There are four possible options:

• None. No time adjustment is applied.

• Current Gas Day. AVEVA Measurement Advisor uses the field contract date and time of the current gas day.

• Next Gas Day. AVEVA Measurement Advisor uses the field contract date and time of the next gas day.

• Nearest Gas Day. AVEVA Measurement Advisor uses the field contract date and time of the nearest gas day.

Received Time

This column indicates at what time the sample was received. It is possible to edit the received time by selecting the associated cell.

Analyzed Time

This column allows you to define the time when the sample was analyzed. It is possible to edit the analyzed time by selecting the associated cell.

Report Number

This column indicates the number of the sample.

Sample Type

This column indicates the type of lab sample that was taken.

Comment

Optional: It is possible to enter a comment.

Sampled By

This column indicates the contact who took the sample. There is an associated dropdown list, allowing you to select the contact who took the sample.

Received By

This column indicates the contact who received the sample. There is an associated dropdown list, allowing you to select the contact who received the sample.

Analyzed By

This column indicates which contact analyzed the sample. There is an associated dropdown menu, allowing you to select the contact who analyzed the sample.

Lab Code

This code indicates the organization that analyzed the gas. This is defined in the Sampled GQ section of the GQ Properties, GQ Quality tab, under Analyzing Organization. For more information, refer to Properties for gas quality (GQ): gas quality tab.

Test Gravity

This column is used for testing the specific gravity of a sample. Specific gravity is the ratio of the density of a substance to the density (mass of the same unit volume) of a reference substance.

Gas Liquid Ratio

Provides information about the GQ flow rate, relative to the total liquid volume flow rate (oil and water). All volumes are recorded at standard pressure and temperature.

Line Pressure

The pressure of the fluid in the pipeline at the point where the sample was taken. The pressure is due to the fluid velocity.

Sample Pressure

The pressure of the sample.

Sample Temperature

The temperature of the sample.

Edit State

The Edit State provides information about the state of the data. The data can be in one of the following states:

• Observed — Indicates that the data has been measured in the field.

• Observed Accepted — If this is applied to a rejected reading, standard checks to ensure that the data is neither too old or recorded for a date in the future will occur.

• Edited — This indicates that there have been changes to the data.

• Manual Override — This indicates that fields that are normally calculated by the system have been overwritten by some user input

• Actualized — This indicates that you have accepted the data. It will not be overwritten by new telemetered input.

Data Quality

The quality status of the data. This could be one of the following:

• Unassigned

• Missing

• Late

• Late Estimated

• Commissioning

• Valid

• Accepted

• Flagged

• Ignored

Process State

This column indicates whether the data is being processed. It is also used to display problems associated with the processing of the data.

Last Mod Time

The time the last modification to the listed field was saved.

Last Mod User

The name of the last user to modify the listed field.