`GRUPTARG`

Recognised by the OPM Flow parserSCHEDULE

The GRUPTARG keyword modifies the target and constraints values of both rates and pressures for previously defined groups without having to define all the variables on the group control keywords: GCONPROD or GCONPRI keywords. Variables not changed by the GRUPTARG keyword remain the same as those previously entered via the group control keywords or previously entered GRUPTARG keywords. Note that the group must still be initially be fully defined using the GCONPROD or GCONPRI keywords. All the aforementioned keywords are described in the SCHEDULE section.

This keyword is not supported by OPM Flow but would change the results if supported so the simulation will be stopped.

Note that wells are allocated to groups when the wells are specified by the WELSPECS keyword in the SCHEDULE section. Wells defined to be under group control will have their production rates controlled by the group to which they belong, in addition to any well constraints defined for the wells.

Notes:

The keyword is followed by any number records with each record terminated by a “/” and the keyword should be terminated by a “/”.

See also the WELTARG and WELCNTL keyword, in the SCHEDULE section that can be used to reset a well’s control mode, as well as a well’s target and constraints of both rates and pressures.

Records: One or more records, each terminated by /
Items per record: 3

Parameters

No.	Name	Description	Type	Field	Metric	Lab	Default
1	`GROUP` manual: `GRPNAME`	A character string of up to eight characters in length that defines the group name for which the group target and constraints are being defined. The group named FIELD is the top most group and should be used to set targets and constraints for the field. Note that the group hierarchy should be defined by the GRUPTREE keyword when there is more than one level of groups, otherwise all the groups will sit directly under the FIELD group in the group tree hierarchy.	STRING				None
2	`TARGET`	A defined character string that sets the item to be changed for the group the value of the item is set by item (3). ORAT: reset the surface oil production rate value as defined by item (3). WRAT: reset the surface water production rate value as defined by item (3). GRAT: reset the surface gas production rate value as defined by item (3). LRAT: reset the surface liquid (oil plus water) production rate value as defined by (3). RESV: reset the in situ reservoir volume rate value as defined by (3). GUID: reset the guide rate value for wells operating under group control. Note TARGET only defines the variable to be changed, it does not change how a group is controlled. For example, if a group is operating on ORAT control, as defined by the previously entered GCONPROD keyword, entering TARGET equal to LRAT with a value, changes the liquid constraint but the group still remains on ORAT control. Use the GCONPROD or GCONPRI keywords in the SCHEDULE section to change the control mode of a well. `ORATWRATGRATLRATRESVGUID`	STRING				None
3	`NEW_VALUE` manual: `VALUE Liquid Gas Res Vol Pressure`	A real positive value that defines the value of the variable declared by TARGET	DOUBLE	stb/d Mscf/d rb/d psia	sm3/day sm3/day rm3/day barsa	scc/hour scc/hour rcc/hour atma	None

Example

The following example below shows the oil rates for the field at the start of the schedule section (January 1, 2000).
-- ------------------------------------------------------------------------------
-- 01 JAN 2000 START OF SCHEDULE SECTION
-- ------------------------------------------------------------------------------
--
-- GROUP PRODUCTION CONTROLS
--
-- GRUP CNTL OIL WAT GAS LIQ CNTL GRUP GUIDE GUIDE CNTL
-- NAME MODE RATE RATE RATE RATE OPT CNTL RATE DEF WAT
GCONPROD
FIELD ORAT 40E3 60E3 30E3 65E3 1* 1* 1* 1* 1* /
/ DATES
01 FEB 2000 /
/
--
-- GROUP PRODUCTION AND INJECTION TARGETS
--
-- GROUP GROUP TARGET
-- NAME TARG VALUE
GRUPTARG
FIELD ORAT 45E3 /
FIELD LIQ 75E3 /
/
From January 1, 2000 to February 1, 2000 the field is on oil rate control and has a target oil rate of 40,000 stb/d, a maximum water handling capacity of 60,000 stb/d, a maximum liquid capacity of 65,000 stb/d, and a maximum gas constraint of 30 MMscf/d. After February 1, 2000 the field’s target oil rate is increased to 45,000 stb/d and the maximum liquid constraint is increased to 75,000 stb/s; all the other parameters remain unchanged.

Manual source: parts/chapters/subsections/12.3/GRUPTARG.fodt