Center for Integrated Operations in the Petroleum Industry - NTNU

Center for Integrated Operations in the Petroleum Industry
Real Case Comparative Study
Introduction
The Center for Integrated Operations in the Petroleum Industry (IO Center) at NTNU
includes several research programs. Program 2, named "Reservoir management and
production optimization" are working with development of methods, technology and
work processes for real-time reservoir management and real-time production
optimization. One of the program's objectives is to develop a benchmark data base for
research and trial activities. "The data base should use a real field case and in particular
promote comparative studies of alternative methods for history matching and ultimately
closed loop reservoir management. StatoilHydro's Norne Field in the Norwegian Sea has
been in production for approximately 11 years and will be used as the pilot study for the
IO Center. The field has high quality 4D seismic data and production data.
StatoilHydro is positive toward cooperation with the IO Center on the development of
such a real field case. At the moment, there exists no benchmark case consisting of real
data. The most realistic case present today is the Brugge Field (synthetic), presented early
2008.
Norne Benchmark Case
The IO Centre aims at presenting the Norne case to research institutions, universities and
other interested organizations. Two cases are suggested, included lists of required data for
each case. The main advantage of this case compared to other models, is the available
real data from a producing field. The range of possible benchmark cases that can be made
is influenced by the amount of released data. The data will be released in different
packages, which either is dependent or independent of the previous packages. One
package will be followed by a benchmark case that utilizes the released data. The cases

are independent or extensions to an existing case when new data is released. The
following data will be released initially as a description of the Norne Field:
- Reservoir simulation model in Eclipse history matched until December 2003
- Geological report describing the Stratigraphy of the field consisting 17 zones and
petrophysics reports from three wells measurements which gives data regarding to
permeability, water saturation, net-to-gross, thickness, porosity, capillary
pressure, porosity-permeability relationship in all formations.
- All wells including well logs.
- The reservoir has been producing from 1997, oil rate, water rate, gas rate are
available for each well and FBHP are also recorded, the model is history matched
until 2003.
- Production data for each well from 2003 to 2008 are given for history matching
purpose.
- 4D seismic data in 2001 as base case and four monitors in 2003, 2004, 2006,
2008 - ( full stack 4D seismic data)
- Difference in saturations and pressure in each cell from 2003, 2004, 2006 and
2008 inverted seismic data.
- Economic parameter data such data oil price, water injection cost, and water
separation cost, gas injection cost.
Below is a list of data that is initially not released for this test case:
- Water analysis data (used for scale evaluation)
- Tracer data
- Lab data
- Seismic data 3D and 4D data from 2001, 2003, 2004, 2006 and 2008
- Seismic processing sequence
- Reprocessed seismic data 2006 (for structural re-evaluation)
- Unprocessed seismic data
- Well data
- Production Logging (PLT) well E4

- Injection Logging (ILT) well F1
At a later stage some of this data may be released.
Description of Benchmark Case
This benchmark case considers the time frame from 2003 to 2008 for history matching.
The actual model from 2003, containing all information and properties until that time will
be given. In addition, production and injection data from 2003 to 2008, and 4D seismic
data for the same period will be provided. These data will be the basis for the history
match performed by participants. Each participant will produce a report describing the
results and the methods used to achieve their results. Then, the participants will discuss
the results in a workshop organized by the IO Centre. At this stage, proposals for
improvements will be made.
Case 1
1. Download the Norne model from 2003 and import it into your reservoir simulator.
The production history for 2003-2008, reports and all required data is given in our
website http://www.ipt.ntnu.no/~norne/ .
2. Participants history match the model, in the period 2003-2008
3. Using the history matched results from above, come up with an optimal
production strategy for the remaining recoverable resources for the future
period. Participants may suggest techniques to enhance recovery, since 86% of
the recoverable reserves are already produced by the end of 2007.
4. Discuss and compare results.
After participants have finished their work, a SPE paper will be published and presented
at a conference regarding a relevant topic. The SPE comparative solution project paper
will include description of the problems and presentation of participants and utilized
methods. Thereafter, the results of the history match and prediction from the different
workshop delegates will be introduced, compared and commented in the paper.