`WELCNTL`

Recognised by the OPM Flow parserSCHEDULE

The WELCNTL keyword modifies a well’s target control and value, both rates and pressures, for previously defined wells without having to define all the variables on the well control keywords: WCONPROD, WCONHIST, WCONINJE, or WCONINJH keywords. Variables not changed by the WELCNTL keyword remain the same as those previously entered via the well control keywords or previously entered WELCNTL keywords. Note that the well must still be initially be fully defined using the WCONPROD or WCONINJE 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.

Notes:

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

If a well is currently a history matching well, then WELCNTL can be used to change the well to a standard well. See also the WELTARG keyword, in the SCHEDULE section that can be used to reset 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	`WELL` manual: `WELNAME`	A character string of up to eight characters in length that defines the well name for which the well production rates and pressures data are being redefined. Note that the well name (WELNAME) must have been declared previously using the WELSPECS and WCONPROD (or WCONINJE) keywords in the SCHEDULE section, otherwise an error may occur.	STRING				None
2	`CMODE` manual: `TARGET`	A defined character string that sets the item to be changed for the well 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 he in situ reservoir volume rate value as defined by (3). BHP: reset the bottom-hole pressure value as defined by item (3). THP: reset the tubing head pressure value for the well as defined by item (3). VFP: reset the vertical lift performance table number as defined by (3). LIFT: reset the artificial lift quantity for use with vertical lift performance tables. GUID: reset the guide rate value for wells operating under group control. Note TARGET redefines the target controlled for a well and the control value on item (4). For example, if a well is operating on ORAT control, as defined by the previously entered WCONPROD keyword, entering TARGET equal to LRAT with a value, sets the TARGET to liquid rate with the given value. That is the well will be targeting a liquid rate not the previously requested oil ratel. Use the WELTARG keyword in the SCHEDULE section to change the target and constraint values for a well. `ORATWRATGRATLRATRESVBHPTHPVFPLIFTGUID`	STRING				None
3	`NEW_VALUE` manual: `VALUE Liquid Gas Res Vol Pressure VFP LIFT`	A real positive value that defines the value of the variable declared by TARGET	DOUBLE	stb/d Mscf/d rb/d psia dimensionless same as VFPPROD or VFPINJ	sm3/day sm3/day rm3/day barsa dimensionless same as VFPPROD or VFPINJ	scc/hour scc/hour rcc/hour atma dimensionless same as VFPPROD or VFPINJ	None

Example

The following example below shows the oil rates for the OP01 oil producer at the start of the schedule section (January 1, 2000).
-- ------------------------------------------------------------------------------
-- 01 JAN 2000 START OF SCHEDULE SECTION
-- ------------------------------------------------------------------------------
--
-- WELL PRODUCTION WELL CONTROLS
--
-- WELL OPEN/ CNTL OIL WAT GAS LIQ RES BHP THP VFP VFP
-- NAME SHUT MODE RATE RATE RATE RATE RATE PRES PRES TABLE ALFQ
WCONPROD
OP01 OPEN ORAT 3000 1* 1* 1* 1* 750.0 500. 9 1* /
/ DATES
01 FEB 2000 /
/
--
-- WELL CONTROL MODE AND OPERATING TARGET
--
-- WELL WELL TARGET
-- NAME CNTL VALUE WELCNTL
OP01 LRAT 5000 /
/
From January 1, 2000 to February 1, 2000 well OP01 is open and is on oil rate control and has a target oil rate of 3,000 stb/d and uses VFPPROD vertical lift table number 9 with a minimum tubing head pressure constraint of 500 psia. After February 1, 2000 the well is changed to liquid control with a target rate of 5,000 stb/d of liquid and all the other parameters remain unchanged.

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