`WELSEGS`

Recognised by the OPM Flow parserSCHEDULE

The WELSEGS keyword defines a well to be a multi-segment well and defines the well’s segment structure. Note that the well must have previously been defined by the WELSPECS keyword in the SCHEDULE section and that the WELSEGS keyword should be repeated for each multi-segment well in the model.

Notes:

Each multi-segment wells must be defined by a separate WELSEGS keyword that consists of two records, with entries 1-1 to 1-12 representing record one items and 2-1 to 2-15 representing record number two items in the “No.” column in this table.

Record number two of the keyword, items 2-1 to 2-15, can be repeated a total of up to MXSEGS-1 times as declared on the WSEGDIMS keyword in the RUNSPEC section.

Each of the records are terminated by a “/” and is explicitly shown in the above rows and the keyword should be terminated by a “/”.

The maximum number of wells should be defined via the WELLDIMS keyword and the maximum number of multi-segment wells should be declared on the WSEGDIMS keyword, both keywords are in the RUNSPEC section.

See also the WELSPECS keyword to define wells, the COMPDAT keyword to define the well completions for both ordinary wells and multi-segment wells, and the COMPSEGS keyword to define multi-segment well segment completions. All the aforementioned keywords are described in the SCHEDULE section.

Records: One or more records, each terminated by /
Items per record: record 1: 9, record 2: 12

Parameters

Record 1

No.	Name	Description	Type	Dimension	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 a multi-segment well is being defined. Note that the well name (WELNAME) must have been declared previously using the WELSPECS keyword in the SCHEDULE section, otherwise an error may occur.	STRING					None
2	`TOP_DEPTH` manual: `TOPDEP`	A real value that defines the depth of the nodal point of the top segment. This is used as the reference depth for reporting the bottom-hole pressure for the multi-segment well. If the keyword is entered multiple times for the same well, due to for example the well configuration changing through time, then it is only necessary to enter this data the first time the keyword is used for a well.	DOUBLE	Length	feet	m	cm	None
3	`TOP_LENGTH` manual: `TOPLEN`	A real positive value that defines the length of the tubing from the tubing reference point (for example Measured Depth Relative to Kelly Bushing, MDRKB) to the nodal point of the top segment. Tubing pressures between the nodal point of the top segment and the well head are not calculated by the multi-segment well option as these are taken into account by the VFP tables allocated to the well and entered via the VFPPROD and VFPINJ keywords in the SCHEDULE section. If TOPLEN is set to zero or defaulted then the tubing length is measured from the nodal point of the top segment.	DOUBLE	Length	feet	m	cm	0
4	`WELLBORE_VOLUME` manual: `WBORVOL`	A real positive value that defines the effective wellbore volume for the top segment, that is from the tubing head or wellhead at the surface to the nodal point of the top segment. The default value of 1.0 x 10-5 results in minimal wellbore storage.	DOUBLE	LengthLengthLength	ft3	m3	cm3	1.0E-5
5	`INFO_TYPE` manual: `TUBOPT`	A defined character string that specifies the type of length and depth data entered for LENGTH and DEPTH on the second record and should be set to one of the following: INC: Incremental changes in values of length and depth for each segment. ABS: Absolute values of length and depth for each segment. As there is no default value for TUBOPT one of the above options must be explicitly defined.	STRING					None
6	`PRESSURE_COMPONENTS` manual: `PRESOPT`	A defined character string that specifies the pressure drop calculation used for each well segment and should be set to one of the following: HFA: Sets the pressure calculation to include the hydrostatic, friction and acceleration terms. HF-: Sets the pressure calculation to include the hydrostatic and friction terms only. H--: Sets the pressure calculation to include the hydrostatic pressure drop term only. The default value for PRESOPT of HFA sets the pressure calculation to include the hydrostatic, friction and acceleration terms.	STRING					HFA
7	`FLOW_MODEL` manual: `FLOWOPT`	A defined character string that specifies the type of multi-phase calculation used for each well segment and should be set to one of the following: HO: Sets the multi-phase calculation to the homogeneous model, that is all phases flow at the same velocity. DF-: Sets the multi-phase calculation to the Drift Flux Slip model. OPM Flow only supports the default value of HO.	STRING					HO
8	`TOP_X` manual: `TOPX`	A real positive value equal to or greater than zero that defines the coordinate in the x-direction of the nodal point of the top segment that is used for display purposes only. Currently this option is not supported by OPM Flow.	DOUBLE	Length	feet	m	cm	None
9	`TOP_Y` manual: `TOPY`	A real positive value equal to or greater than zero that defines the coordinate in the y-direction of the nodal point of the top segment that is used for display purposes only. Currently this option is not supported by OPM Flow.	DOUBLE	Length	feet	m	cm	None
10	`XAREATH`	A real positive value equal to or greater than zero that defines the cross-sectional area of the pipe wall used in thermal conductivity calculations for when the temperature calculation is activated by the TEMP keyword in the RUNSPEC section. Currently this option is not supported by OPM Flow.			ft2	m2	cm2	None
11	`VHEATCAP`	A real positive value equal to or greater than zero that defines the volumetric heat capacity of the pipe wall used in thermal conductivity calculations for when the temperature calculation is activated by the TEMP keyword in the RUNSPEC section. Currently this option is not supported by OPM Flow.			Btu/ft/day/°R	kJ/m/day/K	J/cm/hr/K	None
12	`THCON`	A real positive value equal to or greater than zero that defines the thermal conductivity of the pipe wall used in thermal conductivity calculations for when the temperature calculation is activated by the TEMP keyword in the RUNSPEC section. Currently this option is not supported by OPM Flow.			Btu/ft/day/°R	kJ/m/day/K	J/cm/hr/K	None

Record 2

No.	Name	Description	Type	Dimension	Field	Metric	Lab	Default
1	`SEGMENT1` manual: `ISEG1`	A positive integer greater than or equal to two and less than or equal to MXSEGS on WSEGDIMS keyword in the RUNSPEC section that defines the start of the segment range.	INT					None
2	`SEGMENT2` manual: `ISEG2`	A positive integer greater than or equal to ISEG1 on this record and less than or equal to MXSEGS on the WSEGDIMS keyword in the RUNSPEC section that defines the end of the segment range.	INT					None
3	`BRANCH` manual: `IBRANCH`	A positive integer greater than or equal to one and less than or equal to MXBRAN on WSEGDIMS keyword in the RUNSPEC section that defines the branch number of a segment. All segments on the main stem must have IBRANCH set to one, and those on lateral branches should have IBRANCH set to between two and MXBRAN.	INT					None
4	`JOIN_SEGMENT` manual: `ISEG3`	A positive integer greater than or equal to one and less than or equal to MXSEGS on the WSEGDIMS keyword in the RUNSPEC section that defines the outlet segment for the segment at the start of the segment range (ISEG1).	INT					None
5	`LENGTH`	A real positive value that: If TUBOPT is set to INC then LENGTH is the incremental length of the tubing for each segment in the segment range. If TUBOPT is set to ABS then LENGTH is the length of the tubing from the tubing reference point to the last segment in the range. The length between the nodal point of the last segment and the outlet segment is divided equally between each of the segments in the segment range.	DOUBLE	Length	feet	m	cm	None
6	`DEPTH`	A real positive value that: If TUBOPT is set to INC then DEPTH is the incremental depth change of the tubing for each segment in the segment range. If TUBOPT is set to ABS then DEPTH defines the depth of the tubing at the nodal point of the last segment in the segment range. The depths for other segments in the segment range are obtained by linear interpolation.	DOUBLE	Length
7	`DIAMETER` manual: `ID`	A real positive value that defines the tubing internal diameter of each segment in the segment range.	DOUBLE	Length	feet	m	cm	None
8	`ROUGHNESS` manual: `EPSILON`	A real positive value that defines the tubing absolute roughness of each segment in the segment range.	DOUBLE	Length	feet	m	cm	None
9	`AREA` manual: `XAREA`	A real positive value equal to or greater than zero that defines the cross-sectional area for fluid flow. Currently this option is not supported by OPM Flow.	DOUBLE	Length*Length	ft2	m2	cm2	None
10	`VOLUME` manual: `VOLSEG`	VOLSEG is a real positive value that defines the effective segment volume for the this segment. Currently this option is not supported by OPM Flow.	DOUBLE	LengthLengthLength	ft3	m3	cm3	None
11	`LENGTH_X` manual: `XCORDS`	A real positive value that: If TUBOPT is set to INC then XCORDS is the incremental change in the x-coordinate of the tubing for each segment in the segment range. If TUBOPT is set to ABS then XCORDS defines the x-coordinate of the tubing at the nodal point of the last segment in the segment range. The x-coordinates for other segments in the segment range are obtained by linear interpolation. Currently this option is not supported by OPM Flow.	DOUBLE	Length	feet	m	cm	None
12	`LENGTH_Y` manual: `YCORDS`	A real positive value that: If TUBOPT is set to INC then YCORDS is the incremental change in the y-coordinate of the tubing for each segment in the segment range. If TUBOPT is set to ABS then YCORDS defines the y-coordinate of the tubing at the nodal point of the last segment in the segment range. The y-coordinates for other segments in the segment range are obtained by linear interpolation. Currently this option is not supported by OPM Flow.	DOUBLE	Length	feet	m	cm	None
13	`XAREAS`	A real positive value equal to or greater than zero that defines the cross-sectional area of the pipe wall for this segment, that is used in thermal conductivity calculations for when the temperature calculation is activated by the TEMP keyword in the RUNSPEC section. Currently this option is not supported by OPM Flow.			ft2	m2	cm2	None
14	`VHEATSEG`	A real positive value equal to or greater than zero that defines the volumetric heat capacity of the pipe wall for this segment, that is used in thermal conductivity calculations for when the temperature calculation is activated by the TEMP keyword in the RUNSPEC section. Currently this option is not supported by OPM Flow.			Btu/ft/day/°R	kJ/m/day/K	J/cm/hr/K	None
15	`THCSEG`	A real positive value equal to or greater than zero that defines the thermal conductivity of the pipe wall for this segment, that is used in thermal conductivity calculations for when the temperature calculation is activated by the TEMP keyword in the RUNSPEC section. Currently this option is not supported by OPM Flow.			Btu/ft/day/°R	kJ/m/day/K	J/cm/hr/K	None

Example

The following example defines one multi-segment oil production well (OP01) using the WELSPECS, WELSEGS, COMPDAT and COMPSEGS keywords, and one standard water injection well (WI01) using the WELSPECS and COMPDAT keywords.
--
-- 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
OP01 PLATFORM 10 10 1* OIL /
WI01 PLATFORM 1 1 1* WATER /
/
--
-- WELL CONNECTION DATA
--
-- WELL --- LOCATION --- OPEN SAT CONN WELL KH SKIN D DIR
-- NAME II JJ K1 K2 SHUT TAB FACT DIA FACT FACT FACT PEN
COMPDAT
OP01 10 10 1 1 OPEN 1* 200. 0.5 /
OP01 10 10 2 2 OPEN 1* 200. 0.5 /
OP01 10 10 3 3 OPEN 1* 200. 0.4 /
OP01 10 10 4 4 OPEN 1* 200. 0.4 /
OP01 10 10 5 5 OPEN 1* 200. 0.4 /
OP01 10 10 6 6 OPEN 1* 200. 0.4 /
OP01 9 10 2 2 OPEN 1* 200. 0.4 /
OP01 8 10 2 2 OPEN 1* 200. 0.4 /
OP01 7 10 2 2 OPEN 1* 200. 0.4 /
OP01 6 10 2 2 OPEN 1* 200. 0.4 /
OP01 5 10 2 2 OPEN 1* 200. 0.4 /
OP01 10 9 3 3 OPEN 1* 200. 0.4 /
OP01 10 8 3 3 OPEN 1* 200. 0.4 /
OP01 10 7 3 3 OPEN 1* 200. 0.4 /
OP01 10 6 3 3 OPEN 1* 200. 0.4 /
OP01 10 5 3 3 OPEN 1* 200. 0.4 /
OP01 9 10 5 5 OPEN 1* 200. 0.4 /
OP01 8 10 5 5 OPEN 1* 200. 0.4 /
OP01 7 10 5 5 OPEN 1* 200. 0.4 /
OP01 6 10 5 5 OPEN 1* 200. 0.4 /
OP01 5 10 5 5 OPEN 1* 200. 0.4 /
OP01 10 9 6 6 OPEN 1* 200. 0.4 /
OP01 10 8 6 6 OPEN 1* 200. 0.4 /
OP01 10 7 6 6 OPEN 1* 200. 0.4 /
OP01 10 6 6 6 OPEN 1* 200. 0.4 /
OP01 10 5 6 6 OPEN 1* 200. 0.4 /
WI01 1 1 7 9 OPEN 1* 200. 0.5 /
/
--
-- WELL SEGMENT SPECIFICATION DATA
--
-- WELL NODAL LEN WELL DEPH PRESS FLOW
-- NAME DEPTH TUBING VOLM OPTN CALC MODEL
WELSEGS
OP01 2512.5 2512.5 1.0E-5 ABS HFA HO /
--
-- SEG SEG BRAN SEG TUBING NODAL TUBE TUBE XSEC VOL
-- ISTR IEND NO NO LENGTH DEPTH ID ROUGH AREA SEG
2 2 1 1 2537.5 2534.5 0.3 0.00010 /
3 3 1 2 2562.5 2560.5 0.3 0.00010 /
4 4 1 3 2587.5 2593.5 0.3 0.00010 /
5 5 1 4 2612.5 2614.5 0.3 0.00010 /
6 6 1 5 2637.5 2635.5 0.3 0.00010 /
7 7 2 2 2737.5 2538.5 0.2 0.00010 /
8 8 2 7 2937.5 2537.5 0.2 0.00010 /
9 9 2 8 3137.5 2539.5 0.2 0.00010 /
10 10 2 9 3337.5 2535.5 0.2 0.00010 /
11 11 2 10 3537.5 2536.5 0.2 0.00010 /
12 12 3 3 2762.5 2563.5 0.2 0.00010 /
13 13 3 12 2962.5 2562.5 0.1 0.00010 /
14 14 3 13 3162.5 2562.5 0.1 0.00010 /
15 15 3 14 3362.5 2564.5 0.1 0.00010 /
16 16 3 15 3562.5 2562.5 0.1 0.00010 /
17 17 4 5 2812.5 2613.5 0.2 0.00010 /
18 18 4 17 3012.5 2612.5 0.1 0.00010 /
19 19 4 18 3212.5 2612.5 0.1 0.00010 /
20 20 4 19 3412.5 2612.5 0.1 0.00010 /
21 21 4 20 3612.5 2613.5 0.1 0.00010 /
22 22 5 6 2837.5 2634.5 0.2 0.00010 /
23 23 5 22 3037.5 2637.5 0.2 0.00010 /
24 24 5 23 3237.5 2638.5 0.2 0.00010 /
25 25 5 24 3437.5 2639.5 0.1 0.00010 /
26 26 5 25 3637.5 2639.5 0.1 0.00010 /
/
--
-- COMPLETION SEGMENT SPECIFICATION DATA
--
-- WELL
-- NAME
COMPSEGS
OP01 /
--
-- --LOCATION-- BRAN START END DIR LOC MID COMP ISEG
-- II JJ K1 NO LENGTH LENGTHPEN I,J,K PERFS LENGTH NO.
10 10 1 1 2512.5 2525.0 /
10 10 2 1 2525.0 2550.0 /
10 10 3 1 2550.0 2575.0 /
10 10 4 1 2575.0 2600.0 /
10 10 5 1 2600.0 2625.0 /
10 10 6 1 2625.0 2650.0 /
9 10 2 2 2637.5 2837.5 /
8 10 2 2 2837.5 3037.5 /
7 10 2 2 3037.5 3237.5 /
6 10 2 2 3237.5 3437.5 /
5 10 2 2 3437.5 3637.5 /
10 9 3 3 2662.5 2862.5 /
10 8 3 3 2862.5 3062.5 /
10 7 3 3 3062.5 3262.5 /
10 6 3 3 3262.5 3462.5 /
10 5 3 3 3462.5 3662.5 /
9 10 5 4 2712.5 2912.5 /
8 10 5 4 2912.5 3112.5 /
7 10 5 4 3112.5 3312.5 /
6 10 5 4 3312.5 3512.5 /
5 10 5 4 3512.5 3712.5 /
10 9 6 5 2737.5 2937.5 /
10 8 6 5 2937.5 3137.5 /
10 7 6 5 3137.5 3337.5 /
10 6 6 5 3337.5 3537.5 /
10 5 6 5 3537.5 3737.5 /
/
Note the use of both the COMPDAT and COMPSEGS keywords to fully define a multi-segment well’s completion.
Finally, Figure 12.15depicts the resulting well configuration for both wells, with the conventional water injection well shown in blue and the multi-segment oil producer shown in green.
[formula]
[formula]Figure 12.15: Multi-Segment Well OP01 Completion 3D View

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