Reservoir Simulation

Overview

Led by Dr. Kamy Sepehrnoori, the objectives of this research group include the development, testing, verification, and application of reservoir simulators for oil and gas recovery processes. The reservoir simulators developed by this research group are used as test beds for new process physics, computational algorithms, physical property models, and other scientific purposes. Our most recent code developments have been concentrated on the design and implementation of a multi-purpose suit of compositional reservoir simulators called the Multi-Purpose Simulator (MPS). This code is intended for the simulation of miscible gas flooding, chemical flooding, and simulating production form unconventional reservoirs. Other ongoing projects include model developments for wettability alteration, geomechanics, unstructured gridding, naturally fractured reservoirs, and compositional fluid flow in reservoir and wellobores including flow assurance issues such as asphaltene and scales precipitation and deposition. For the last several years, a great effort has been concentrated on simulation of unconventional reservoirs and development of embedded discrete fracture modeling (EDFM). We address the application of our codes as well as the commercial reservoir simulators for solving field simulation studies.

Annual Meeting

The RS-JIP meeting takes place yearly on the last Thursday and Friday of February.

Development and Maintenance of Simulators For EOR Processes

The main tasks in this project are to maintain and expand the capability of our compositional equation-of-state reservoir simulator (UTCOMPRS).

The main tasks in this project are to maintain and expand the capability of our chemical flooding reservoir simulator (UTCHEMRS).

We present the framework for high performance parallel processing and the design for our new simulator: MPS.

Unconventional Reservoir Modeling and Simulation

The objective of this study is to develop a system of upscaling methods to generate efficient reduced order models for different reservoir conditions.

The objective is to evaluate the effect of the presence of natural fractures on the induced-fractures geometry and the effective permeability of the stimulated rock volume (SRV) and to assess the contribution of natural fractures to the estimated ultimate recovery (EUR). This can be done by comparing the history-matching end results for a reservoir model, with both induced and natural fractures included, to those for a simpler model with induced fractures only.

The objective of the study was to investigate the feasibility of huff-n-puff EOR in the gas-condensate part of the field. Compositional reservoir simulation was used to predict the performance of enhanced oil recovery. A sector model was built for the area selected as the prospective candidate for gas injection. The embedded discrete fracture model (EDFM) was used for modeling the fractures, improving the CPU time…

The objective of this study is to retrieve an unbiased multiple history-matched solutions and posterior distribution of fractures and reservoir properties in shale gas/shale oil wells.

The objective of this study is to develop a coupled flow-geomechanics simulator which incorporates not only porosity change but also fracture conductivity variation, and to apply it to formations with complex fracture networks for better infill drilling and refracturing design.

The objective of this study is to identify and analyze the mechanisms behind inter-well interference, evaluate its effect on well performance and well spacing optimization.

Objective: Optimize unconventional reservoir development such as fracture spacing, effectiveness of staged fracturing. Evaluate fracture properties, geometry and multiphase flow measurement. Ultimately, our model and analysis approach will be beneficial to the decision-making process in shale or tight reservoir.

The objective of this study is to identify and analyze the mechanisms behind EOR processes in shale, evaluate their effects on oil recovery, formulate the production optimization strategies by taking into account the EOR processes, and create useful criteria, guidelines, and rule of thumbs related to EOR application in shale reservoirs

The objective of this study is to investigate the impact of well interference through connecting fractures by multi-well history matching, and to propose profitable opportunities for Huff-n-Puff application during the development of the field.

Descriptions of some of the ongoing projects concentrated on further developments EDFM.

Model Development (Ongoing and Previous Projects)

The production of hydrocarbons often involves a concurrent gas and liquid (oil/water) flow in the wellbore. As a multiphase/multicomponent gas-oil mixture flows from the reservoir to the surface, pressure, temperature, composition, and liquid holdup distributions are interrelated.

Conformance control methods using polymer gel treatments have been widely used to reduce water production as well as improve sweep efficiency. Conformance control strategies include

We have extensively worked on development and application of coupled reservoir-wellbore model to predict asphaltene and scale formation in the reservoir and wellbore. For the asphaltene module, both PC-SAFT and Peng-Robinson EOSs have been implemented to accurately predict the asphaltene phase behavior…

The electrical low frequency heating is a thermal recovery process that has been proposed for high viscous and heavy oil reservoirs.

Waterflooding as a secondary oil recovery method is still the most commonly used technique for fluid injection since 1865.

Carbonate rocks account for more than half the world's hydrocarbon proven reserves. Oil recovery from these reservoirs is a challenge due to their complex nature. Several enhanced oil recovery techniques have been proposed for improving the oil recovery from carbonate reservoirs.

Reservoir souring is an increase in hydrogen sulfide concentration during water injection operations. H2S content reduces the value of produced hydrocarbon, in addition to being a health and safety issue. Nitrate injection is an effective method to prevent the formation of H2S.

We have developed and implemented an element-based finite volume method (EbFVM) for unstructured grids using mixed elements. The EbFVM has been implemented and tested in both UTCOMPRS and UTCHEMRS…

Laboratory surfactant/alkali and hot water floods have shown great potential in increasing oil recovery for reservoirs that are naturally fractured and have low permeability and mixed-wet matrix rocks.

Oil recovery from fractured carbonate reservoirs by water flooding is often inefficient due to the commonly oil-wet nature of these rocks and the lack of sufficient spontaneous capillary imbibition driving force to push oil out from the matrix to the fracture network.