B. Data file (“BASIC data input example”)

Following is an example of minimum required data input to Eclipse. The keywords are commented using lines starting with two dashes. Full understanding of the file is not to be expected at this stage. Note: Section headers are in bold for clarity only. An eclipse data file must be in text-only format, not. e.g. saved as a Word-document.

RUNSPEC ==============================================================

--Title is used as header on output, to identify run TITLE

Example simple Eclipse file, lecture notes

--Specify dimension of model, NX, NY, NZ

--Phases included (oil and water, i.e. 2-phase run)

OIL WATER

--Units to use, alternatives are METRIC, FIELD or LAB FIELD

--Specify maximum values for well data (# means “max number of”) WELLDIMS

GRID ===========================================================

--Turn off writing of data to report file NOECHO

--Definition of grid cells. From DIMENS keyword above, we have:

--N = NX*NY*NZ = 10*3*3 = 90.

--In each cell DX = DY = 1000 ft and DZ = 50 ft

--(Dimension measured in feet since units were defined as FIELD above)

--The grid cells are then defined by:

DX

90*1000 /

DY

90*1000 /

DZ

90*50 /

--So far the grid shape has been defined, but we also need to define at

--which depth (measured from sea level) the cell tops are. We assume a

--horizontal reservoir, and input depths which are consistent with the

--DZ-values we defined above.

TOPS

30*5000 30*5050 30*5100 /

--Permeabilities are constant, so define 90 equal values. PERMX

90*200 / PERMY

90*200 / PERMZ

90*200 /

--Porosity is constant in each layer, so define 30 values in layer 1,

--30 in layer 2, and 30 in layer 3. Each layer contains 30 cells. PORO

30*0.3

30*0.23

30*0.18 /

11

SUMMARY ==============================================================

--List data vectors which we want stored for graphics post-processing

--Field Oil Production Rate

FOPR

--Field Oil Production Total FOPT

--Field Water Cut

FWCT

--Field Pressure (averaged reservoir pressure)

FPR

--Field Oil In Place

FOIP

--Field Water Production Rate FWPR

--Field Water Injection Rate FWIR

--Well Water Cut for all wells WWCT

/

SCHEDULE ==============================================================

--Specify output of graphics result files for cell data, and times which

--to write these. (Details to come later)

RPTRST

BASIC=5 NORST=1 FREQ=6 /

-- Well specification: Give names, positions (i, j) and main phase of wells

--(Note two slashes, one terminates each well, one terminates the keyword)

--Completion data, the well is open to the reservoir in cells in layers

--from k_hi to k_lo.

--Production data, specify producing rate and constraints

--Well WP1 will produce with an oil rate of 2000 STB/day constrained by

--that well’s flowing bottomhole pressure is minimum 3350 psi.

--(Details to come later)

DATES

1 'JUL' 2005 /

/

END

13

A note on units

Eclipse accepts data in metric units, as well as field or lab units. Specification of which unit convention to use is done in the RUNSPEC section. Since metric units are widely used by Norwegian oil companies and international companies based in Norway, unless otherwise specified all the examples in these notes will assume metric units are used.

14