WINJCLN
Recognised by the OPM Flow parserSCHEDULE
The WINJCLN keyword signals that a filter cake should be completely or partially cleaned – this effectively multiplies the accumulated filter cake skin.
Notes:
The keyword is followed by any number of records with each record terminated by a “/” and the keyword should be terminated by a “/”.
Repeated occurrences of this keyword will have a multiplicative effect.
See also the WINJDAN keyword to define the filter cake properties and the WINJFCNC keyword to define a well’s injected filtrate concentration. All the aforementioned keywords are described in the SCHEDULE section.
- Records
- One or more records, each terminated by
/ - Items per record
- 5
Parameters
| 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 the filter cake properties are 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 | FRAC_manual: FCLNFRAC | A real positive value between 0 and 1 that defines the fraction of filter cake permeability (skin factor) to be removed. The accumulated filter cake skin factor for matching connections will be multiplied by (1 – FCLNFRAC), so the default value of 1 will completely clean the filter cake. | DOUBLE | 1 | dimensionless | dimensionless | dimensionless | 1 |
| 3 | I | An integer that defines the matching connection location in the I-direction. If set to < 1 then all connections in the I-direction that also satisfy J and K criteria are selected. | INT | -1 | ||||
| 4 | J | An integer that defines the matching connection location in the J-direction. If set to < 1 then all connections in the J-direction that also satisfy I and K criteria are selected. | INT | -1 | ||||
| 5 | K | An integer that defines the matching connection location in the K-direction. If set to < 1 then all connections in the K-direction that also satisfy I and J criteria are selected. | INT | -1 |
Example
The following example signals the filter cake clean up for water injection wells using WINJCLN:
--
-- WELL FILTER CAKE CLEAN UP
--
-- WELL CLEAN --LOCATION--
-- NAME FRAC II JJ KK
WINJDAM
INJ-A1 0.4 0 0 3 /
INJ-A1 0.4 0 0 4 /
INJ-B* 0.9 /
/
In well INJ-A1 forty percent of the filter cake is cleaned up in well connections in layers 3 and 4 (filter cake skin is multiplied by 0.6). In wells matching INJ-B* ninety percent of the filter cake is cleaned up in all well connections (filter cake skin is multiplied by 0.1).Manual source: parts/chapters/subsections/12.3/WINJCLN.fodt