Trevor Stoddard - Academia.edu (original) (raw)
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Papers by Trevor Stoddard
Day 3 Wed, February 23, 2022, 2022
Economic pressure to improve production efficiency in unconventional reservoirs has met a stiff c... more Economic pressure to improve production efficiency in unconventional reservoirs has met a stiff challenge to scale up traditional reservoir modeling methods to the entire field for quantifying well performance. The main reasons are lack of availability of key reservoir and well parameters and difficulty to setup and maintain models because of the large well count and rapid pace of operations. As a result, decline curve analysis is still the prevailing method for large scale evaluations, which does not consider routine pressure variations and operational constraints. Analytical rate transient (RTA) models warrant identification of flow regimes and geometrical assumptions (well and fractures) to apply discrete analytical models for various flow segments. This inherent limitation of RTA makes it interpretive and not conducive to fieldscale application, besides often lacking necessary inputs for all wells. It is desirable to have better understanding through a robust and consistent well...
In oil and gas field development, reservoir simulation is applied to accurately predict and analy... more In oil and gas field development, reservoir simulation is applied to accurately predict and analyze fluid flow during production. The results of reservoir simulation can be used as input for 4D geomechanical modelling to obtain the earth’s mechanical response such as reservoir compaction. However, in such a one-way coupling scheme, the geomechanical response of a system has no influence on the reservoir simulation, whereas in reality mechanical and flow behaviors influence each other. In two-way coupling, this dependency is taken into account. We perform two-way coupling using the JewelEarthTM platform, connecting CMG’s IMEX Blackoil simulator and Abaqus for the geomechanical simulations. In the coupling process, we update (among others) the available pore volume and pore pressures in the reservoir at each time step, while not changing the fluid accumulations (masses). Optionally, we also continuously enhance the reservoir simulator’s internal geomechanical estimate with a pseudo-co...
Fracture conductivity is one of the most important properties of geothermal systems - conventiona... more Fracture conductivity is one of the most important properties of geothermal systems - conventional or enhanced. One of the areas of research in enhanced geothermal systems (EGS) involves using proppant to increase retained fracture conductivity - retained and maintained after hydraulic fracturing. Proppant is natural or manmade particulates that are injected concurrently with hydraulic fracturing fluids while creating an EGS fracture system. After fracturing operations the proppant remains in the fractures and “props” them open to ensure retained conductive pathways that would otherwise close under prevailing in-situ stresses. The primary purpose of this study is to investigate the effect of proppant on fracture stability and the effect of temperature on fracture conductivity in both a saw cut (nominally smooth, low friction) and wedge-split (higher friction, fractured) case. Proppant was placed in a surrogate fracture, temperature applied and hydraulic confining pressure was also a...
Abu Dhabi International Petroleum Exhibition & Conference
Day 3 Wed, February 23, 2022, 2022
Economic pressure to improve production efficiency in unconventional reservoirs has met a stiff c... more Economic pressure to improve production efficiency in unconventional reservoirs has met a stiff challenge to scale up traditional reservoir modeling methods to the entire field for quantifying well performance. The main reasons are lack of availability of key reservoir and well parameters and difficulty to setup and maintain models because of the large well count and rapid pace of operations. As a result, decline curve analysis is still the prevailing method for large scale evaluations, which does not consider routine pressure variations and operational constraints. Analytical rate transient (RTA) models warrant identification of flow regimes and geometrical assumptions (well and fractures) to apply discrete analytical models for various flow segments. This inherent limitation of RTA makes it interpretive and not conducive to fieldscale application, besides often lacking necessary inputs for all wells. It is desirable to have better understanding through a robust and consistent well...
In oil and gas field development, reservoir simulation is applied to accurately predict and analy... more In oil and gas field development, reservoir simulation is applied to accurately predict and analyze fluid flow during production. The results of reservoir simulation can be used as input for 4D geomechanical modelling to obtain the earth’s mechanical response such as reservoir compaction. However, in such a one-way coupling scheme, the geomechanical response of a system has no influence on the reservoir simulation, whereas in reality mechanical and flow behaviors influence each other. In two-way coupling, this dependency is taken into account. We perform two-way coupling using the JewelEarthTM platform, connecting CMG’s IMEX Blackoil simulator and Abaqus for the geomechanical simulations. In the coupling process, we update (among others) the available pore volume and pore pressures in the reservoir at each time step, while not changing the fluid accumulations (masses). Optionally, we also continuously enhance the reservoir simulator’s internal geomechanical estimate with a pseudo-co...
Fracture conductivity is one of the most important properties of geothermal systems - conventiona... more Fracture conductivity is one of the most important properties of geothermal systems - conventional or enhanced. One of the areas of research in enhanced geothermal systems (EGS) involves using proppant to increase retained fracture conductivity - retained and maintained after hydraulic fracturing. Proppant is natural or manmade particulates that are injected concurrently with hydraulic fracturing fluids while creating an EGS fracture system. After fracturing operations the proppant remains in the fractures and “props” them open to ensure retained conductive pathways that would otherwise close under prevailing in-situ stresses. The primary purpose of this study is to investigate the effect of proppant on fracture stability and the effect of temperature on fracture conductivity in both a saw cut (nominally smooth, low friction) and wedge-split (higher friction, fractured) case. Proppant was placed in a surrogate fracture, temperature applied and hydraulic confining pressure was also a...
Abu Dhabi International Petroleum Exhibition & Conference