New, improved equation solves for volatile oil, condensate reserves

Journal Article · Mon Aug 22 00:00:00 EDT 1994 · Oil and Gas Journal; (United States)

OSTI ID:6997630

Walsh, M P ^[1]

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1. Petroleum Recovery Research Inst., Austin, TX (United States)

A new generalized material-balance equation (GMBE) can be applied to the full range of reservoir fluids, including volatile oil and gas condensate. The GMBE replaces the nearly 60-year-old conventional material-balance equation (CMBE). Material balance methods are routinely used by petroleum engineers to estimate reserves. The so-called straight-line methods are the most common. Two of the most popular are: P/z-plot for estimating gas reserves in a dry-gas reservoir; and Havlena and Odeh method for estimating original oil-in-place (N) and original gas-in-place (G) in a black-oil reservoir. A major shortcoming of these and other straight-line methods is that none apply to the full range of reservoir fluids and very few, if any, deal satisfactorily with volatile oil and rich gas condensate. Also, the limits of the methods are not well defined. As drilling goes deeper and more volatile oil and gas-condensate reservoirs are discovered, there is a growing need for a general straight-line method to estimate N and G. For the GMBE, no restrictions are placed on the initial fluid compositions.

• OSTI ID: 6997630
• Journal Information: Oil and Gas Journal; (United States), Vol. 92:34; ISSN 0030-1388
• Country of Publication: United States
• Language: English

Related Subjects

02 PETROLEUM
03 NATURAL GAS
RESERVOIR FLUIDS
MATERIAL BALANCE
CALCULATION METHODS
EQUATIONS
EQUATIONS OF STATE
GAS CONDENSATES
GAS SATURATION
NATURAL GAS
NATURAL GAS DEPOSITS
OIL SATURATION
PETROLEUM
PETROLEUM DEPOSITS
VOLATILE MATTER
WATER INFLUX
CONDENSATES
ENERGY SOURCES
FLUIDS
FOSSIL FUELS
FUEL GAS
FUELS
GAS FUELS
GASES
GEOLOGIC DEPOSITS
LIQUIDS
MATTER
MINERAL RESOURCES
NATURAL GAS LIQUIDS
RESOURCES
SATURATION
020200* - Petroleum- Reserves
Geology
& Exploration
030200 - Natural Gas- Reserves
Geology
& Exploration