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Numerical Modeling of the Stability of Horizontal Multidrain Oil Wells

China Ocean Engineering 2015年第5期29卷 719-732页

作者： ayub elyasi Kamran GOSHTASBI Faculty of Engineering Tarbiat Modares University

The stability of the horizontal multidrain wells is a crucial issue and several factors are involved in this matter, including in-situ stresses, magnitude and distribution as well as the mainbore trajectories. In this paper, this issue is evaluated by assuming different circumstances for the above mentioned factors, based on finite difference threedimensional modeling by using the finite difference numerical software, FLAC3 D. The stability of the mainbore and lateral branches is analyzed based on the Normalized Yielded Zone Area（NYZA） criterion, i.e. the ratio of the surrounding yielded cross-sectional area to the initial area of the well. Optimum mud pressures are obtained in the mainbore and lateral branches in different mainbore trajectories under three in-situ stress regimes. In addition, the stability of the junction where the lateral branches are bifurcated from the mainbore is assessed in those situations. The optimum trajectory of the mainbore, in which the junction has obtained the most stable condition, is selected in each stress regime. It was concluded that in the Normal Faulting（NF） stress regime, the mainbore and junction stability varies in relation to the mainbore trajectories, inversely. However, in the other two stress regimes, i.e. Strike Slip（SS） and Reverse Faulting（RF）, the variations of the mainbore and junction stability are in the same trend with respect to the mainbore trajectory deviations.

关键词： multidrain wells in-situ stresses NYZA mainbore lateral branches

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Numerical assessment of the mechanical stability in vertical,directional and horizontal wellbores

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International Journal of Mining Science and Technology 2013年第6期23卷 937-942页

作者： Kamran Goshtasbi ayub elyasi Ali Naeimipour Department of Mining Engineering Tarbiat Modares University School of Energy and Mineral Engineering Pennsylvania State University

In this research the stability of wellbore is evaluated in seven different stress regimes and diverse orientations using FLAC3D *** normalized yielded zone area(NYZA.i.e.,the ratio of surrounding yielded cross-sectional area to initial area of wellbore)is determined for different mud pressures as well as diverse orientations of *** means of MATLAB software the best curve is fitted to the recorded points and then the optimized mud pressure is calculated using these *** optimized orientation is selected considering these *** the mud pressure resulted from this method was compared with the mud pressure obtained from the Mogi-Coulomb criterion and then with the fields *** minimum allowable mud pressure obtained from the NYZA criterion is close to actual data and the value obtained from the Mogi-Coulomb ***,the NYZA is considered to be an appropriate criterion for wellbore stability analysis.

关键词： NYZA Mud pressure Optimum orientation Stress regime

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