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Development of constraint handling techniques for well placement optimization in Petroleum Field Development - Problem formulation and implementation for FieldOpt software including well index calculation for deviated wells

Magnusson, Hilmar
Master thesis
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URI
http://hdl.handle.net/11250/2418710
Date
2016
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Abstract
Well placement optimization is an important part of Petroleum Field Development.

However, in order to improve the optimization procedures, it can be important to

incorporate considerations like knowledge about the geology of the reservoir or

about existing or planned well paths. This leads to additional constraints that

have to be satisfied during the optimization. In this thesis we concentrate in

particular on constraints on the well lengths and the distance between the wells.

We suggest an alternating projections method to deal with both constraints at the

same time, and develop an efficient numerical method for the solution. Although we

cannot prove that the method is convergent, numerical results of our implementation

indicate that the approach works as intended.

An additional important contribution from this work is the

implementation of a well index calculator.

In reservoir simulation, the well index relates the flow rate

and pressure of the wellbore to the pressure solution of the

subsurface fluid flow system, and is therefore an essential

part in computing resulting production volumes.

We also implement an algorithm that, given a slanted

well and the physical state of a reservoir, calculates

the well indices for the well blocks that are intersected

by the well.

In particular the well index calculation for deviated wells

is a nontrivial task that is important for well placement

optimization research.

This task is already handled by some industry reservoir

simulators, but the implementation is hidden from the

end-user.

All of the implementations are meant to be an addition to FieldOpt, a petroleum

field development optimization framework that is currently under development by

the Petroleum Cybernetics Group at NTNU.
Publisher
NTNU

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