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Investigation of production depletion rate effect on the ne ar-wellbore stresses in the two Iranian southwest oilfields|

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Petroleum Research 2020年第4期5卷 347-361页

作者： Khalil Shahbazi Amir Hossein Zarei Alireza Shahbazi Abbas Ayatizadeh Tanha Faculy Member of Petroleur University of Technologx Iran Ahwaz Faculy of Engineering Petroleurm University of Techunology Iran National lrunion Driling Compury Well Logging DepartmentAhwazlran

Effect of depletion rate on wellbore stability due to production of oil from hydrocarbon-bearing reser-voirs is important and can result in a reduction of the reservoir pore pressure.A reduction in the reservoir pressure,in tum,results in a change in the stresses acting within the *** these changes are not well analyzed and applied in future calculations,we may be unsuccessful in some cases such as drilling infill wells or extended wells,forecast of sand production and optimum flow rate,preventing of casing collapse,***,knowing the stresses around the well at every stage of production is fundamental to the next *** this paper,we recognized these changes in near-wellbore stresses using data from logging(image log,dipole sonic,full set log,mud log),production data,infor-mation from kick,blow out,loss *** determined it using Techlog software and theoretical *** wells of two huge oilfields of sw Iran were investigated after depletion or production for long *** each well,state of stresses were calculated in cases of safe drilling mud weight using log data and theoretical *** the end effect of depletion rate on wellbore stability was investigated in these three wells.

关键词： depletion rate Wellbore stability Pore pressure Sand production Near-wellbore stress

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Modeling of a long sand-pack for heavy crude oil through depletion tests utilizing methane gas

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Petroleum 2021年第2期7卷 188-198页

作者： Bashir Busahmin Rama Rao Karri Stephen Tyson Morteza Jami Petroleum&Chemical Engineering Universiti Teknologi BruneiBrunei Darussalam

With the enormous increase in the demand for crude oil,and decrease in the resources of conventional oil reservoirs,there is a great need to understand heavy or foamy oil-gas drive mechanism to maximize the oil and gas *** analyze the real movement of non-viscous heavy oil flow,the characteristic features of the oil-gas mixture has to be estimated to forecast the future potential supply from a heavy oil *** important question in heavy oil flow under solution gas drive is whether the behaviour of depletion tests can be simulated to model the heavy oil flow *** main objective of this research is to develop a reliable numerical model for modelling heavy oil flow calibrated with controlled solution gas drive experiments,and that makes a novelty in this *** this paper,CMG-STARS model which is capable of simulating solution gas drive tests that matched the research *** heavy oil recovery model can determine the relative permeability curves for oil and gas in the dualphase system using Corey’s *** a depletion rate of 0.0418 psi/min,the maximum cumulative oil and gas production was observed to be 13,000 cm^(3)and 8500 cm^(3),*** results from the bottom hole pressure and the block pressure simulation runs indicate that the fluid properties such as surface tension plays a significant role in the gas bubble *** results are promising,and helps to understand the complex behaviour of heavy oil reservoirs and thus can improve heavy oil recovery.

关键词： depletion rate Simulation Gas fluid dual-phase Sand-pack Heavy oil reservoir Methane gas

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