Browsing by Subject "CO2 injection"

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Access status: Open Access ,
Evaluating capillary threshold pressure in caprocks for carbon storage
(Wydawnictwa AGH, 2024) Soomro, Ahsan Nabi; Anioł, Łukasz
Increased $CO_{2}$ emissions have resulted in extreme climatic variations and as the forecast is that the global temperature will hit its highest-ever level in the next five years. This comes at a time when there is an urgent need for effective and smooth means of reducing greenhouse gas emissions. Geological Sequestration of Carbon (GCS) is a new alternative: the effective and safe storage of $CO_{2}$ underground. The most critical part of the process is the leakage assessment and geological formation safety as a long-term sink of $CO_{2}$. Caprock is important in this process as an efficient long-time sequester for $CO_{2}$, as it is more permeable to $CO_{2}$ than geological reservoirs. Of all the other processes involved in trapping, the most effective in the immediate phase after the injection of $CO_{2}$ is capillary trapping. The $CO_{2}$ remains stored under the caprock until the critical pressure that initiates movement is achieved. Traditional methods, such as mercury intrusion porosimetry and core flooding experiments, do not tend to be replicated correctly in-situ and often complicate the process. Measurements made in such a manner usually overestimate threshold pressures for one of many reasons, be it late flow signal recognition in the low permeability of caprocks or incompletely saturated cores. For these purposes, in-situ-type novel equipment was developed for easy and direct capillary pressure measurement, core saturation, and effortless reproduction of in-situ conditions at higher pressures. This new technique measures the pressure in the outflow directly, so the values of threshold pressure it gives are very exact.
Access status: Open Access ,
The analysis of CO₂ injection in depleted gas reservoirs during the sequestration process
(2015) Gonet, Kamil; Blicharski, Jacek; Rybicki, Czesław
One of increasingly used methods for reducing carbon dioxide emission to atmosphere is CCS technology (Carbon Capture and Storage). The last element of sequestration technological chain, after capturing and transporting, is $CO_{2}$ storage which is currently considered in: natural environment, oceans and geological structures – of which depleted gas reservoirs have high sequestrating potential mainly by virtue of proven record of geological recognition and high recovery factor, hence, great storage capacity. This paper is connected with first stage of $CO_{2}$ storage in depleted gas reservoir i.e. flow of injected fluid inside the well. Conducted analysis was concerned about $CO_{2}$ flow conditions inside the injection well in various stages of $CO_{2}$ storage process, and furthermore, relation between reservoir pressure, injection rate, well diameter. Moreover, the thermodynamic conditions and its impact on changeability of PVT parameters and hence phase changes were also investigated.