2010
DOI: 10.3390/en3101639
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A Simple Analytical Approach to Simulate Underbalanced- drilling in Naturally Fractured Reservoirs—The Effect of Short Overbalanced Conditions and Time Effect

Abstract: This paper describes an analytical approach to investigate the nature of short overbalanced conditions and time effects during underbalanced drilling (UBD) in a naturally fractured reservoir. This study uses an analytical model which is developed for kinetic invasion of mud into the fractures. The model is based on fluid flow between two parallel plates, which is further extended to model the fluid flow in a fractured formation. The effect of short overbalanced pressure and the time effect during UBD as well a… Show more

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Cited by 6 publications
(4 citation statements)
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“…In UBD the main pressure control objectives are: to keep the pressure in the openhole region above the collapse pressure, or more rarely, to limit the amount of produced fluid below the processing capacity (indirectly controlled by the pressure differential); to keep the pressure below the reservoir pressure, as even short periods of overbalance can severely damage your assets (Salimi et al, 2010); and to keep the surface and casing pressures within the equipment and well limitations. Note that well pressure limits are not for one given point, but for the whole openhole region.…”
Section: Drilling Objectives and Constraintsmentioning
confidence: 99%
“…In UBD the main pressure control objectives are: to keep the pressure in the openhole region above the collapse pressure, or more rarely, to limit the amount of produced fluid below the processing capacity (indirectly controlled by the pressure differential); to keep the pressure below the reservoir pressure, as even short periods of overbalance can severely damage your assets (Salimi et al, 2010); and to keep the surface and casing pressures within the equipment and well limitations. Note that well pressure limits are not for one given point, but for the whole openhole region.…”
Section: Drilling Objectives and Constraintsmentioning
confidence: 99%
“…Too low pressure may also cause problems with well stability. If the pressure rises above the pore pressure, we will lose some of the main benefits from underbalanced drilling, as even short periods of overbalance may lead to great damage to the reservoir (Salimi et al, 2010). We state the well stability constraints as a maximum and minimum limit on pressure in the open-hole region, including some safety margins.…”
Section: Drilling Model and Control Systemmentioning
confidence: 99%
“…UBD processes are the prominent performances to reduce the formation damage effect regarding the mud invasion (fluid filtrate and mud solids) through the fractured and permeable rock formations [15][16][17][18]. Salimi et al (2010) investigated the crucial parameters, which were seriously influenced by the formation damage in UBD procedures. The parameters that they concentrated on were capillary pressure, oil viscosity, water relative permeability, and the saturation of initial water [19].…”
Section: Introductionmentioning
confidence: 99%
“…Salimi et al (2010) investigated the crucial parameters, which were seriously influenced by the formation damage in UBD procedures. The parameters that they concentrated on were capillary pressure, oil viscosity, water relative permeability, and the saturation of initial water [19]. In this paper, a numerical model was developed to consider different reservoir characteristics of porosity, permeability, water saturation and oil viscosity that are of crucial in reservoir planning and management.…”
Section: Introductionmentioning
confidence: 99%