![](https://csdnimg.cn/release/download_crawler_static/88568555/bg14.jpg)
Well data dimensions
Eclipse must know how many wells to allocate memory for, and how much memory is needed for
each well. This is specified in the WELLDIMS keyword, with entries,
MAXWELLS Maximum number of wells in the model
MAXCONNW Maximum number of connections (completions) in each well
MAXGROUP Maximum number of groups in model
MAXWELLG Maximum number of wells in a single group
The default value for all the entries is zero, so this keyword must be specified if the model contains
any wells.
Example
WELLDIMS
-- MAXWELLS MAXCONNW MAXGROUP MAXWELLG
18 6 1 18 /
NSTACK (chapters 17-18)
To redefine the size of the NSTACK, i.e. the number of search directions to store for use by the linear
solver, include the keyword NSTACK. The default value of NSTACK is 10.
Example
To increase NSTACK to 25,
NSTACK
25 /
Aquifer specifications – AQUDIMS (chapter 14)
Specify maximum number of lines in the AQUNUM and AQUCON keywords. (I.e. not the number of
connections defined, but the number of lines used to define the connections in the keyword)
Default values are zero, so this keyword must be specified if aquifers are used.
Example
AQUDIMS
-- Max#NumLines Max#ConnLines (rest not used for numerical aquifers)
5 7 /
Grid options (chapter 13)
The GRIDOPTS keyword is used to flag that negative index transmissibility multipliers are used.
(And some other flags which are not used in these notes)
To allow for MULTX– and related keywords, set
GRIDOPTS
YES /
The default is “NO”, so the keyword is not needed if negative index transmissibility multipliers are not
used.
Rock compressibility options (chapter 6)
When rock compressibility is defined by the ROCKTAB (or ROCKTABH) keyword, the keyword
ROCKCOMP must be included in the RUNSPEC section. The keyword has two associated items,
1. Specify if rock compaction is reversible (elastic) or irreversible (plastic), or if tables with
hysteresis are used. Choices are REVERS, IRREVERS, and HYSTER
2. Number of rock compaction tables (equal to number of ROCKNUM regions)
Example
To specify that ROCKTAB tables are irreversible, and that the model includes three different rocknum
regions,
ROCKCOMP
IRREVERS 3 /
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