Predicting gas in place in abnormal reservoirs

Journal Article · Mon Jun 01 04:00:00 EDT 1981 · Pet. Eng. Int.; (United States)

OSTI ID:6003902

Stelly, II, O V; Farshad, F F

Application of the conventional gas material balance equation to abnormally pressured volumetric reservoirs results in erroneous estimates of ultimate recovery. In view of the increasing number and importance of this type of reservoir, the program presented results in more realistic predictions. In abnormally pressured reservoirs, the formation is not supporting as great a portion of the overburden stress. Thus, when pressure is depleted, the sand grains and connate water of the formation expand. These factors tend to reduce the available hydrocarbon pore space acting as a drive mechanism. Thus, production is due to a combination of factors that cause subsequent changes in effective compressibility of the formation rather than just gas compressibility. Hammelindl proposed a correction factor equivalent to the ratio of effective compressibility to gas compressibility. This is applied to the results obtained for normally pressured reservoirs.

• OSTI ID: 6003902
• Journal Information: Pet. Eng. Int.; (United States), Journal Name: Pet. Eng. Int.; (United States) Vol. 53:7; ISSN PEEID
• Country of Publication: United States
• Language: English

Related Subjects

03 NATURAL GAS
030100* -- Natural Gas-- Reserves-- (-1989)
COMPRESSIBILITY
ENERGY SOURCES
ENGINEERING
EVALUATION
FOSSIL FUELS
FUELS
GEOLOGIC DEPOSITS
MATERIAL BALANCE
MECHANICAL PROPERTIES
MINERAL RESOURCES
NATURAL GAS DEPOSITS
OVERBURDEN
PERFORMANCE
PETROLEUM
RESERVES
RESERVOIR ENGINEERING
RESERVOIR PRESSURE
RESERVOIR ROCK
RESOURCE ASSESSMENT
RESOURCES