Mechanical earth modeling and sand onset production prediction for Well X in Malay Basin
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ORIGINAL PAPER—PRODUCTION GEOPHYSICS
Mechanical earth modeling and sand onset production prediction for Well X in Malay Basin N. I. Ismail1 · M. Y. Naz2 · S. Shukrullah2 · S. A. Sulaiman3 Received: 8 April 2020 / Accepted: 10 June 2020 © The Author(s) 2020
Abstract This study is aimed at testing Mechanical earth modeling (MEM) and Sand onset production prediction (SOP) models using well log and core data to estimate the mechanical properties of the rock, in-situ stresses and the critical conditions at which the rock failure may occur. New numerical models were developed to predict the onset of sand production for Well X. The outputs from MEM were coupled with the Mohr Coulomb failure criterion to calculate the critical wellbore pressure of the well and consequently the depth of the rock at which failure may occur. The results showed that at depth of 1061.68–1098.10 m, the calculated critical wellbore pressures were negatives, which reveal low possibility of sand production. However, at a depth of 1098.25–2230.89 m, the calculated critical wellbore pressures were positives. In this depth range, there was high possibility of rock failure. In conclusion, based on the findings, Well X may produce sand at depth deeper than 1100 m. Therefore, mitigation and preventive actions should be planned for Well X to handle and manage the possible sand production from the identified interval. Keywords Mechanical earth modeling · Sand onset production · Critical wellbore pressure
Introduction Sand production constitutes a major problem in oil and gas industry. According to Tabrizy and Mirzaahmadian (Tabrizy and Mirzaahmadian 2012), the sand may be produced due to the following conditions: (1) The loss of mechanical integrity of the rocks surrounding an open hole or perforation (failure), (2) separation of the solid particles from the rocks due to hydrodynamic flow (post-failure) and (3) transportation of the particles to surface by the reservoir fluids. The production of sand if not controlled with care will pose some disadvantages, such as erosion to down-hole and surface facilities, and fine migration to oil and gas wells (Fjar et al. 2008). For sand control to be implemented, normally it will need heavy investment from the operators. Thus, option to * M. Y. Naz [email protected] 1
Department of Petroleum Engineering, Universiti Teknologi PETRONAS, 32610 Bandar Seri Iskandar, Perak, Malaysia
2
Department of Physics, University of Agriculture, Faisalabad 38040, Pakistan
3
Department of Mechanical Engineering, Universiti Teknologi PETRONAS, 32610 Bandar Seri Iskandar, Perak, Malaysia
estimate either sand control is needed before production or after some time of sand-free production has attracted great interest of the operators (Tabrizy and Mirzaahmadian 2012). For sand control decision-making, the critical wellbore pressure and depth at which the rock failure may occurs need to be predicted. There are numerous numerical and analytical Sanding Onset Prediction (SOP) models published in the literature. Most of the
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