OPM Flow Keyword Reference

ROCKCOMP

Recognised by the OPM Flow parserRUNSPEC

The ROCKCOMP keyword activates rock compaction and defines various rock compaction options for the run. By default OPM Flow models rock compaction via pore volume compressibility as entered on the ROCK keyword in the PROPS section. This keyword enables pressure dependent pore volume and transmissibility multipliers for rock compaction that are entered in the PROPS section using the ROCKTAB keyword. Currently OPM Flow only supports the default options for rock compaction.

Notes:

The keyword is terminated by a “/”.

Records
Fixed number of records
Record count
1
Items per record
5

Parameters

No.NameDescriptionTypeDefault
1HYSTERESIS
manual: ROCKOPT
A character string that defines the rock compaction option based on one of the following character strings: REVERS: Rock compaction is reversible with increasing pressure. The rock compaction multipliers should be entered via the ROCKTAB keyword in the PROPS section. This is the default value. IRREVERS: Rock compaction is irreversible, that is the rock expansion does not occur when the pressure subsequently increases. HYSTER: Invokes the hysteresis rock compaction option. BOBERG: Rock compaction hysteresis is modeled using the Boberg formulation93 Beattie, C.I., Boberg, T.C., and McNab, G.S. “Reservoir Simulation of Cyclic Steam Stimulation in the Cold Lake Oil Sands,” paper SPE 18752, Society of Petroleum Engineers Journal, (1991) 6, No. 2, 200-206.. Beattie, C.I., Boberg, T.C., and McNab, G.S. “Reservoir Simulation of Cyclic Steam Stimulation in the Cold Lake Oil Sands,” paper SPE 18752, Society of Petroleum Engineers Journal, (1991) 6, No. 2, 200-206. REVLIMIT: Activates the reversible hysteresis rock compaction option that limits the pore volume subject to reversibility based on the minimum pressure in a grid block and the initial water saturation. This option is only intended to be used with the water induced compaction model, neither of which are currently supported by OPM Flow.. PALM-MAN: Rock compaction hysteresis is modeled using the Palmer-Mansoori94 Palmer, I. and Mansoori, J. “How Permeability Depends on Stress and Pore Pressure in Coalbeds: A New Model,” paper SPE 52607, SPE Reservoir Evaluation & Engineering (1998) 1, No. 6, 539-544. and 95 Clarkson, C.R., Pan, Z., Palmer, I. and Harpalani, S. "Predicting Sorption-Induced Strain and Permeability Increase With Depletion for Coalbed-Methane Reservoirs", SPE 114778-PA, SPE Journal (2010) 15, No. 1, 152–159.formulation for coal bed methane reservoirs, neither of which are supported by OPM Flow. Palmer, I. and Mansoori, J. “How Permeability Depends on Stress and Pore Pressure in Coalbeds: A New Model,” paper SPE 52607, SPE Reservoir Evaluation & Engineering (1998) 1, No. 6, 539-544. Clarkson, C.R., Pan, Z., Palmer, I. and Harpalani, S. "Predicting Sorption-Induced Strain and Permeability Increase With Depletion for Coalbed-Methane Reservoirs", SPE 114778-PA, SPE Journal (2010) 15, No. 1, 152–159. NONE: Deactivates rock compaction, unless the water induced compaction model has been invoked. Only the REVERS and IRREVERS options are supported by OPM Flow.STRINGREVERS
2NTROCCA positive integer that defines the number of rock compaction tables, that is the number of ROCKTAB tables to be used by OPM Flow.INT1
3WATER_COMPACTION
manual: WATINOPT
A character string that states if the water induced rock compaction option should be used (YES) or not (NO). If set to YES then either the ROCKTABW or the ROCK2D and ROCKWNOD keywords should be entered in the PROPS section.STRINGNO
4PORTXROPA character string that specifies the model to be used for when transmissibility is dependent on porosity, and should be set to either: EXP: An exponential porosity-transmissibility relationship should be used. CZ: The Carmen-Kozeny96 J. Kozeny, "Ueber kapillare Leitung des Wassers im Boden." Sitzungsber Akad. Wiss., Wien, 136(2a): 271-306, 1927., 97 P.C. Carman, "Fluid flow through granular beds." Transactions, Institution of Chemical Engineers, London, 15: 150-166, 1937.and 98 P.C. Carman, "Flow of gases through porous media." Butterworths, London, 1956porosity-transmissibility relationship should be used. J. Kozeny, "Ueber kapillare Leitung des Wassers im Boden." Sitzungsber Akad. Wiss., Wien, 136(2a): 271-306, 1927. P.C. Carman, "Fluid flow through granular beds." Transactions, Institution of Chemical Engineers, London, 15: 150-166, 1937. P.C. Carman, "Flow of gases through porous media." Butterworths, London, 1956 This option is used in the commercial compositional simulator and is therefore ignored by OPM Flow.STRING1*
5CARKZEXPThe exponent constant in the Carmen-Kozeny porosity-transmissibility equation for when PORTXROP has been set to CZ. This option is used in the commercial compositional simulator and is therefore ignored by OPM Flow.DOUBLE0.0

Example

--
-- ROCK NUMBER WAT POR-TRAN
-- OPTN TABLES INDUCE OPTION
ROCKCOMP
REVERS 5 NO 1* /
The above example defines the default values for the ROCKCOMP keyword with five rock compaction tables.

Manual source: parts/chapters/subsections/5.3/ROCKCOMP.fodt