The Condensate Gas Ratio (CGR) Calculator is a tool used in the oil and gas industry to determine the ratio of liquid condensate produced to the volume of gas extracted during production. This metric is crucial for evaluating reservoir performance, optimizing processing facilities, and forecasting production outputs.
By calculating the CGR, operators and engineers can assess the quality of a reservoir, plan infrastructure requirements, and maximize profitability. It also helps in estimating the economic viability of a gas field by determining the potential revenue from condensate production.
Formula of Condensate Gas Ratio Calculator
The formula for calculating the Condensate Gas Ratio is:
CGR = (Volume of Condensate Produced / Volume of Gas Produced) × Conversion Factor
Where:
- Volume of Condensate Produced = measured in barrels (bbl)
- Volume of Gas Produced = measured in million standard cubic feet (MMscf)
- Conversion Factor = typically 1 if the units are already aligned (bbl/MMscf)
Steps to Calculate CGR
- Measure the Volume of Condensate Produced:
Use production data to determine the liquid condensate produced in barrels (bbl). - Measure the Volume of Gas Produced:
Obtain the volume of gas extracted in million standard cubic feet (MMscf). - Align Units Using the Conversion Factor:
Ensure the units of measurement align. The conversion factor is usually 1 for bbl/MMscf. Adjust if other units are used. - Apply the Formula:
Divide the volume of condensate by the volume of gas produced and multiply by the conversion factor.
Reference Table for Typical CGR Values
| Gas Reservoir Type | CGR (bbl/MMscf) | Characteristics |
|---|---|---|
| Dry Gas Reservoir | <10 | Minimal liquid production |
| Wet Gas Reservoir | 10–50 | Moderate liquid production |
| Rich Gas/Condensate Field | >50 | Significant liquid condensate output |
This table provides a general reference for interpreting CGR values in different reservoir types.
Example of Condensate Gas Ratio Calculator
Problem:
A gas field produces 1,200 barrels of condensate and 24 MMscf of gas. Calculate the Condensate Gas Ratio (CGR).
Solution:
Using the formula:
CGR = (Volume of Condensate Produced / Volume of Gas Produced) × Conversion Factor
Substitute the values:
CGR = (1,200 / 24) × 1
CGR = 50 bbl/MMscf
The CGR for this gas field is 50 bbl/MMscf, indicating a rich gas/condensate reservoir.
Most Common FAQs
CGR is a critical metric for assessing reservoir quality and optimizing production. It helps in estimating the economic value of liquid condensate, which often has a higher market value than gas.
Yes, CGR can vary as reservoir conditions change, such as pressure and temperature, which affect the production rates of condensate and gas.
A high CGR indicates a reservoir rich in liquid hydrocarbons, which typically leads to higher economic returns from condensate production.