SAND DIAGENESIS ROCK PHYSICS MODEL TO PREDICT MECHANICAL PROPERTIES OF SUBSURFACE ROCK IN ORDER TO IDENTIFY SANDING PROBLEM.

Sand production problem is a phenomenon in a geologically young producing reservoir -hence relatively low compaction effect and rock strengthwhere solid grains from reservoir transported within the production fluids because the rock itself cannot withstand the pressure that is applied to produce t...

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Main Author: Harisandi, Azhar
Format: Final Project
Language:Indonesia
Online Access:https://digilib.itb.ac.id/gdl/view/43645
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Institution: Institut Teknologi Bandung
Language: Indonesia
id id-itb.:43645
spelling id-itb.:436452019-09-27T15:22:59ZSAND DIAGENESIS ROCK PHYSICS MODEL TO PREDICT MECHANICAL PROPERTIES OF SUBSURFACE ROCK IN ORDER TO IDENTIFY SANDING PROBLEM. Harisandi, Azhar Indonesia Final Project critical porosity, elasticity, rock strength, sandstone diagenesis. INSTITUT TEKNOLOGI BANDUNG https://digilib.itb.ac.id/gdl/view/43645 Sand production problem is a phenomenon in a geologically young producing reservoir -hence relatively low compaction effect and rock strengthwhere solid grains from reservoir transported within the production fluids because the rock itself cannot withstand the pressure that is applied to produce the reservoir. When sanding initially occurs, part of the producing reservoir behaves like a suspended sediment phase, which can only exist above critical porosity point. In this state, any stress or pressure applied to the material will be distributed uniformly by the fluid phase. Rock physics model, specifically sand diagenesis model was made to create a solid fundamental in describing effective elasticity in this field. The model shows a good agreement with the data because it accommodates change in trend of increasing elastic moduli with decrease in porosity in lower porosity range, which turns out that in this range, the dominant mechanism of compaction is chemical compaction or cementation instead of mechanical compaction. Modeled Vp from this model is used to establish empirical relation of porosity and rock strength with laboratory rock mechanical testing data as a calibration points. From rock mechanical testing data applied to three arenite core sample, it is observed that decrease in UCS is accompanied by increase in Poisson’s ratio that can be viewed as a process similar to liquefaction in initial stage of sanding instead of brittle failure, where a part of the rock loses its grain and the suspended grains behave like fluids. From this observation, critical porosity point is assumed to be the state where initial sanding occurs. If the rock strength in the critical porosity point can be estimated, then it is possible to predict the maximum amount of pressure that can be applied to prevent sanding. text
institution Institut Teknologi Bandung
building Institut Teknologi Bandung Library
continent Asia
country Indonesia
Indonesia
content_provider Institut Teknologi Bandung
collection Digital ITB
language Indonesia
description Sand production problem is a phenomenon in a geologically young producing reservoir -hence relatively low compaction effect and rock strengthwhere solid grains from reservoir transported within the production fluids because the rock itself cannot withstand the pressure that is applied to produce the reservoir. When sanding initially occurs, part of the producing reservoir behaves like a suspended sediment phase, which can only exist above critical porosity point. In this state, any stress or pressure applied to the material will be distributed uniformly by the fluid phase. Rock physics model, specifically sand diagenesis model was made to create a solid fundamental in describing effective elasticity in this field. The model shows a good agreement with the data because it accommodates change in trend of increasing elastic moduli with decrease in porosity in lower porosity range, which turns out that in this range, the dominant mechanism of compaction is chemical compaction or cementation instead of mechanical compaction. Modeled Vp from this model is used to establish empirical relation of porosity and rock strength with laboratory rock mechanical testing data as a calibration points. From rock mechanical testing data applied to three arenite core sample, it is observed that decrease in UCS is accompanied by increase in Poisson’s ratio that can be viewed as a process similar to liquefaction in initial stage of sanding instead of brittle failure, where a part of the rock loses its grain and the suspended grains behave like fluids. From this observation, critical porosity point is assumed to be the state where initial sanding occurs. If the rock strength in the critical porosity point can be estimated, then it is possible to predict the maximum amount of pressure that can be applied to prevent sanding.
format Final Project
author Harisandi, Azhar
spellingShingle Harisandi, Azhar
SAND DIAGENESIS ROCK PHYSICS MODEL TO PREDICT MECHANICAL PROPERTIES OF SUBSURFACE ROCK IN ORDER TO IDENTIFY SANDING PROBLEM.
author_facet Harisandi, Azhar
author_sort Harisandi, Azhar
title SAND DIAGENESIS ROCK PHYSICS MODEL TO PREDICT MECHANICAL PROPERTIES OF SUBSURFACE ROCK IN ORDER TO IDENTIFY SANDING PROBLEM.
title_short SAND DIAGENESIS ROCK PHYSICS MODEL TO PREDICT MECHANICAL PROPERTIES OF SUBSURFACE ROCK IN ORDER TO IDENTIFY SANDING PROBLEM.
title_full SAND DIAGENESIS ROCK PHYSICS MODEL TO PREDICT MECHANICAL PROPERTIES OF SUBSURFACE ROCK IN ORDER TO IDENTIFY SANDING PROBLEM.
title_fullStr SAND DIAGENESIS ROCK PHYSICS MODEL TO PREDICT MECHANICAL PROPERTIES OF SUBSURFACE ROCK IN ORDER TO IDENTIFY SANDING PROBLEM.
title_full_unstemmed SAND DIAGENESIS ROCK PHYSICS MODEL TO PREDICT MECHANICAL PROPERTIES OF SUBSURFACE ROCK IN ORDER TO IDENTIFY SANDING PROBLEM.
title_sort sand diagenesis rock physics model to predict mechanical properties of subsurface rock in order to identify sanding problem.
url https://digilib.itb.ac.id/gdl/view/43645
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