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Failure criterion effect on solid production prediction and selection of completion solution

Journal of Rock Mechanics and Geotechnical Engineering 2017年第6期9卷 1123-1130页

作者： Dariush Javani Bernt Aadnoy mahdi rastegarnia Siavash Nadimi Mohammad Ali Aghighi Bijan Maleki Department of Mining Engineering Imam Khomeini International UniversityQazvinIran Department of Petroleum Engineering University of StavangerStavangerNorway Department of Petrophysics Homai Well Services CompanyTehranIran Department of Chemical Engineering Energy and Geoscience InstituteThe University of UtahSalt Lake CityUT 84112USA Department of Mining Engineering University of TehranTehranIran

Production of fines together with reservoir fluid is called solid production. It varies from a few grams or less per ton of reservoir fluid posing only minor problems, to catastrophic amount possibly leading to erosion and complete filling of the borehole. This paper assesses solid production potential in a carbonate gas reservoir located in the south of Iran. Petrophysical logs obtained from the vertical well were employed to construct mechanical earth model. Then, two failure criteria, i.e. Mohre Coulomb and Mogi-Coulomb,were used to investigate the potential of solid production of the well in the initial and depleted conditions of the reservoir. Using these two criteria, we estimated critical collapse pressure and compared them to the reservoir pressure. Solid production occurs if collapse pressure is greater than pore pressure. Results indicate that the two failure criteria show different estimations of solid production potential of the studied reservoir. Mohre Coulomb failure criterion estimated solid production in both initial and depleted conditions, where Mogi-Coulomb criterion predicted no solid production in the initial condition of reservoir. Based on Mogi-Coulomb criterion, the well may not require completion solutions like perforated liner, until at least 60% of reservoir pressure was depleted which leads to decrease in operation cost and time.

关键词： Solid production Mechanical earth model Failure criterion Reservoir depletion Completion solution

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A comparative study of 3D FZI and electrofacies modeling using seismic attribute analysis and neural network technique:A case study of Cheshmeh-Khosh Oil field in Iran

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Petroleum 2016年第3期2卷 225-235页

作者： mahdi rastegarnia Ali Sanati Dariush Javani Department of Petrophysics Pars Petro Zagros Engg.&Services CompanyTehranIran Faculty of Petrochemical and Petroleum Engineering Hakim Sabzevari UniversitySabzevarIran Mining Engineering Department Faculty of Engineering and TechnologyImam Khomeini International UniversityQazvinIran

Electrofacies are used to determine reservoir rock properties,especially permeability,to simulate fluid flow in porous *** are determined based on classification of similar logs among different groups of logging *** classification is accomplished by different statistical analysis such as principal component analysis,cluster analysis and differential *** aim of this study is to predict 3D FZI(flow zone index)and Electrofacies(EFACT)volumes from a large volume of 3D seismic *** study is divided into two *** the first part of the study,in order to make the EFACT model,nuclear magnetic resonance(NMR)log parameters were employed for developing an Electrofacies diagram based on pore size distribution and porosity ***,a graph-based clustering method,known as multi resolution graph-based clustering(MRGC),was employed to classify and obtain the optimum number of *** attribute analysis was then applied to model each relaxation group in order to build the initial 3D model which was used to reach the final model by applying Probabilistic Neural Network(PNN).In the second part of the study,the FZI 3D model was created by multi attributes ***,this model was improved by three different artificial intelligence systems including PNN,multilayer feed-forward network(MLFN)and radial basis function network(RBFN).Finally,models of FZI and EFACT were *** obtained from this study revealed that the two models are in good agreement and PNN method is successful in modeling FZI and EFACT from 3D seismic data for which no Stoneley data or NMR log data are ***,they may be used to detect hydrocarbon-bearing zones and locate the exact place for producing wells for the future development *** addition,the result provides a geologically realistic spatial FZI and reservoir facies distribution which helps to understand the subsurface reservoirs heterogeneities in the study area.

关键词： Electrofacies Nuclear magnetic resonance log Flow zone index Stoneley wave analysis Seismic attribute analysis

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Prediction of new perforation intervals in a depleted reservoir to achieve the maximum productivity: A case study of PNN logging in a cased-well of an Iranian oil reservoir

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Petroleum 2020年第2期6卷 170-176页

作者： Saeed Zaker Shahab mohamadi nafchi mahdi rastegarnia Soheila Bagheri Ali Sanati Amir Naghibi Islamic Azad University Science and Research BranchTehranIran Islamic Azad University Central BranchTehranIran Head of Petrophysics Section Petro Pardazesh Aria CompanyTehranIran Senior Petrophysicist OTS CompanyTehranIran School of Petrochemical and Petroleum Engineering Hakim Sabzevari UniversitySabzevarIran Senior Petrophysicist Iranian Central Oil Field CompanyTehranIran

Pulsed neutron-neutron(PNN)logging is based on emitting neutrons into the near-wellbore zone and computing the neutron count decay due to scattering and *** main application of this logging tool is to determine the current oil saturation and to detect channeling in perforated and non-perforated intervals behind the *** interpretation of the results obtained from PNN logging enables engineers to predict new perforation intervals in depleted *** study examines the application of PNN logging in a well located in one of Iranian oil *** interpretation procedure is described step by *** principle of the PNN logging and the specifications of the tool are discussed and the applications of PNN logging in evaluation of oil saturation,identification of water flooded zones and prediction of potential perforating zones are *** is also investigated between all layers,good and poor oil zones are characterized based on the calculated oil saturations and new perforation intervals are suggested with the aim to boost oil production from the *** results of this study show that zones 1 to 5 having low oil saturations,are interpreted as depleted oil *** 6 to 8 are interpreted as good oil zones having high potential to produce *** 9 is interpreted as a water zone.

关键词： Pulse neutron-neutron(PNN)logging Sigma value Remaining oil saturation Conventional logging Perforation intervals Depleted reservoir

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