Theoretical consideration of CO2 storage capacity, analytical model and numerical simulation in aquifers

Abstract

The problem of increased CO2 emissions has become an important topic. Burning of fossil fuels (oil, coal, natural gas) in order to obtain electricity, thermal energy for industrial and distributed sources such as car engines and furnaces in residential and commercial, as well as the extraction of gases at high CO2 content. Part of CO2 produced by humans is absorbed by plants or dissolved in ocean waters, causing acidification. Remainder accumulates in the atmosphere, causing climate change.

The first part presents the problem of global warming and its threat. It shows the properties of carbon dioxide. A general overview of the major carbon emitters in the world and in storage as well as reports showing the reduction of carbon emissions.

Next part of thesis is presenting one of the possibility of storage and injecting CO2 into underground storage in geological formations and aquifer storage capacity. Show that this is the best way to reduce emissions CO2 to the atmosphere. Presenting that it is harmless to the environment and show the possibility of underground storage. It be describe issues connected with CO2 sequestration. Including definition of sequestration, its objectives, location of major CO2 sources and sequestration sites , capture technology. Show potential storage sites sequestration CO2 in underground formation , trapping mechanism. Characteristics of aquifers and the saline aquifer

One method to control the pore pressure is to produce water from the aquifer at some distance from CO2 injection wells . Thesis discusses results from analytical dynamic model and numerical simulation of CO2 storage, data interpretation and model verification. Following storage scenarios are investigated: injection of CO 2 without water production. Against injection into several wells to distribute the injected fluids and reduce the local pressure increase around each injection well. Likewise injection with simultaneous production of water from one or more wells. Development decisions such a number of injection wells, injection rate, and the need for water production/reinjection may pose deep effect. It is demonstrated that the well completion and injection schemes have strong impact on amount of residual and dissolved CO2.