Partially Separated Metamodels With Evolution Strategies for Well-Placement Optimization
- Zyed Bouzarkouna (IFP Energies Nouvelles) | Didier Y. Ding (IFP Energies Nouvelles) | Anne Auger (INRIA)
- Document ID
- Society of Petroleum Engineers
- SPE Journal
- Publication Date
- April 2013
- Document Type
- Journal Paper
- 1,003 - 1,011
- 2013. Society of Petroleum Engineers
- 1.6 Drilling Operations, 5.7.3 Deterministic Methods, 6.5 Environment, 5.5 Reservoir Simulation
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- 305 since 2007
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The net present value (NPV) of a project can be significantly increased by finding the optimal location of non-conventional wells. This optimization problem is nowadays one of the most challenging problems in oil- and gas-field development. Suitable methods to tackle this problem include stochastic optimization algorithms, which are particularly robust and able to deal with complex reservoir geology with high heterogeneities. However, these methods require in general a considerable computational effort in terms of number of reservoir simulations, which are CPU-time-demanding.
This paper presents the use of the CMA-ES (covariance matrix adaptation-evolution strategy) optimizer, recognized as one of the mostpowerful derivative free optimizers, to optimize well locations and trajectories. A local-regression-based metamodel is incorporated into the optimization process in order to reduce the computational cost. The objective function (e.g., the NPV) can usually be split into local components, referring to each of the wells that moreover depends in general on a smaller number of principal parameters, and thus can be modeled as a partially separable function.
In this paper, we propose to exploit the partial separability of theobjective function into CMA-ES coupled with metamodels by building partiallyseparated metamodels. Thus, different metamodels are built for each well or setof wells, which results in a more accurate modeling.
An example is presented. Results show that taking advantage of the partialseparability of the objective function leads to a significant decrease in thenumber of reservoir simulations needed to find the "optimal" wellconfiguration, given a restricted budget of reservoir simulations. The proposedapproach is practical and promising to deal with the placement of a largenumber of wells.
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