A FRAMEWORK FOR RAPID NUMERICAL WELL TEST ANALYSIS USING AN OPEN SOURCE SIMULATOR
Ahmed Galal Al-Qassaby Al-Metwally;
Abstract
In conjunction with the Open Porous Media (OPM), SINTEF Company in Oslo have released the Matlab Reservoir Simulation Toolbox (MRST) aiming to function as an efficient platform for implementing new ideas and discretization methods in reservoir simulations applications. MRST has been developed as an open source program under the General Public License (GPL1), and in this thesis, the author intends to modify the existing source code of MRST (Release: 2016b) to implement an unstructured gridding algorithm has the ability to conform the basic geological features of the reservoir as an extension to the black oil framework.
The governing equations are evaluated using the finite-volume method and the system of equations is solved fully-implicitly using the Newton-Raphson method. The created model in this thesis is used to build a numerical well testing models to tune the analytical solution results, validated versus the recorded pressure signals from the test (Twelve Different Tests: Draw Down, Build up, Fall off, and Injectivity Test on Vertical, Horizontal, Fractured, and Horizontal Wellswith Transverse Fractures), the analytical type curves, and Schlumberger reservoir simulator; Eclipse, to give a better representation for the geological features and the petro-physical properties of the reservoir using an easy procedure to construct the grid and to assign these properties.
A basic part of MRST is the automatic differentiation algorithm. This is analgorithmused to calculatethe derivatives of flow equations without the monotonous, explicit computing of the derivatives with respect to each variable separately. The main benefit of thatis when applying new physics to existed framework of equations, as the Jacobian/derivative matrix in Newton-Raphson method isautomatically obtained for newly added equations, by simply associating them with a separate Matlab class. Another feature of MRST is that it can read industry standard formattedinput, so the model keywords in Eclipse have also added to MRST to allow an easy transition when comparing the results from the two simulators.
Based on observations made, the author concludes that the work of implementing an unstructured gridding model to an existing black-oil formulation for general grids in MRST has been successful. The model compares well with Eclipse and predicts largely the same behavior in terms of pressure signals for the twelve cases of tests and shows superior advantages of using unstructured gridding in well test analysis. The author means that the model could be a good foundation for further developmentand research in solving reservoir simulation problems.
The governing equations are evaluated using the finite-volume method and the system of equations is solved fully-implicitly using the Newton-Raphson method. The created model in this thesis is used to build a numerical well testing models to tune the analytical solution results, validated versus the recorded pressure signals from the test (Twelve Different Tests: Draw Down, Build up, Fall off, and Injectivity Test on Vertical, Horizontal, Fractured, and Horizontal Wellswith Transverse Fractures), the analytical type curves, and Schlumberger reservoir simulator; Eclipse, to give a better representation for the geological features and the petro-physical properties of the reservoir using an easy procedure to construct the grid and to assign these properties.
A basic part of MRST is the automatic differentiation algorithm. This is analgorithmused to calculatethe derivatives of flow equations without the monotonous, explicit computing of the derivatives with respect to each variable separately. The main benefit of thatis when applying new physics to existed framework of equations, as the Jacobian/derivative matrix in Newton-Raphson method isautomatically obtained for newly added equations, by simply associating them with a separate Matlab class. Another feature of MRST is that it can read industry standard formattedinput, so the model keywords in Eclipse have also added to MRST to allow an easy transition when comparing the results from the two simulators.
Based on observations made, the author concludes that the work of implementing an unstructured gridding model to an existing black-oil formulation for general grids in MRST has been successful. The model compares well with Eclipse and predicts largely the same behavior in terms of pressure signals for the twelve cases of tests and shows superior advantages of using unstructured gridding in well test analysis. The author means that the model could be a good foundation for further developmentand research in solving reservoir simulation problems.
Other data
| Title | A FRAMEWORK FOR RAPID NUMERICAL WELL TEST ANALYSIS USING AN OPEN SOURCE SIMULATOR | Other Titles | نموذج لتسريع التحليل الرقمي لاختبارات الآبار باستخدام محاكي مفتوح المنبع | Authors | Ahmed Galal Al-Qassaby Al-Metwally | Issue Date | 2017 |
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