WELSPECS

Recognised by the OPM Flow parserSCHEDULE

The WELSPECS keyword defines the general well specification data for all well types, and must be used for all wells before any other well specification keywords are used in the input file. The keyword declares the well, the name of the well, the group the well initially belongs to, the wellhead location and other key parameters.

OPM Flow also supports the use of the WELSPECS keyword to change the properties of one or more wells previously specified using the WELSPECS keyword. In particular, this supports changing the controlling group (GRPNAME) without affecting any other well properties such as the location of the well head (I, J) or the well reference depth (BHPREF), since defaulted properties are not changed in this case. However, the well reference depth can be re-defaulted by specifying a negative value for BHPREF. The wells to be changed can be specified using a well name, well name pattern or well list (WELNAME).

Notes:

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

Note that the total number of individual wells declared by the WELSPECS cannot exceed the value entered via the MXWELS variable on the WELLDIMS keyword in the RUNSPEC section.

See also the COMPDAT keyword to define a well’s connections, the WCONPROD and WCONINJE keywords to define a well’s production and injection targets and constraints. All the aforementioned keywords are described in the SCHEDULE section.

Records

One or more records, each terminated by /

Items per record

17

Parameters

Example

The following example defines three wells using the WELSPECS keyword
--
-- WELL SPECIFICATION DATA
--
-- WELL GROUP LOCATION BHP PHASE DRAIN INFLOW OPEN CROSS PVT
-- NAME NAME I J DEPTH FLUID AREA EQUANS SHUT FLOW TABLE
WELSPECS
GI01 PLATFORM 14 13 1* GAS 1* P-P SHUT NO 1* /
GP01 PLATFORM 64 80 1* GAS 1* GPP SHUT NO 1* /
OP01 PLATFORM 24 110 1* OIL 1* STD SHUT NO 1* /
/
Here, well GI01 is a dry gas injection well that uses the dry gas pseudo inflow equation, GP01 is a gas condensate well that uses the generalized gas pseudo pressure inflow equation, and finally, OP01 is an oil well that uses the standard inflow equation. All wells will be shut if they are required to cease production, all wells disallow cross flow, and the hydrostatic head calculation is defaulted to the segment option for all wells.
If the same three wells are using the COMPTRAJ and WELTRAJ keywords to specify the connections to the simulation grid, then the WELSPECS keyword should be;
--
-- WELL SPECIFICATION DATA
--
-- WELL GROUP LOCATION BHP PHASE DRAIN INFLOW OPEN CROSS PVT
-- NAME NAME I J DEPTH FLUID AREA EQUANS SHUT FLOW TABLE
WELSPECS
GI01 PLATFORM 1* 1* 1* GAS 1* P-P SHUT NO 1* /
GP01 PLATFORM 1* 1* 1* GAS 1* GPP SHUT NO 1* /
OP01 PLATFORM 1* 1* 1* OIL 1* STD SHUT NO 1* /
/
Notice how the well location parameters have been defaulted with 1* in this case.
The following example illustrates how the WELSPECS keyword can be used to change the controlling group for oil production wells previously specified by the WELSPECS keyword that have an oil production rate less than 100.
--
-- ACTIONX BLOCK
--
ACTIONX
ACT01    1             /
WOPR     'OP*' < 100.0 /
/
WELSPECS
'?'      'LOWPRESS'   /
/
ENDACTIO

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