Phase behavior of SCCO2 sequestration and enhanced natural gas recovery

Abstract

Some noncommercial gas reservoirs with low reserves are feasible sites for CO 2 sequestration. Those gas reservoirs contain natural gas that can take up the potential pore space of SCCO 2 sequestration in the reservoir. The solution is to recover the natural gas by active CO 2 injection. This idea is carbon sequestration with enhancement gas recovery (CSEGR). In CSEGR, different zones of the formation fluid are formed during the gas migration. In this paper, the sequestration site is a PY gas reservoir. The pressure, volume and temperature properties of the formation fluid are tested by experiments or calculated by the program based on PR-EOS, using a Z-factor, Volume ratio in place (V r:scco 2 ), density and viscosity. We discuss those experimental or simulation results to understand the fluid phase behavior in such a migration during CSEGR in a PY gas reservoir, and we give the suitable site (temperature) and the eligible pressure of the next core-flooding test.

Retracted: Visualization of Low-Permeability Natural Core Carbon Dioxide Immiscible Flooding Flow Characteristics

“…Therefore, in the process of CO2 enrichment in low permeability reservoirs, it is necessary to consider the consequences of the initial pressure change of oil phase. Now, one-dimensional permeability movement equation of oil phase and gas phase can be obtained [13][14]:…”

A Laboratory Approach to Measure Enhanced Gas Recovery from a Tight Gas Reservoir during Supercritical Carbon Dioxide Injection

“…Yang et al (2017) observed that it was not the natural gas features but the physical characteristics of supercritical carbon dioxide, such as viscosity and density, that caused proper displacement efficiency. Therefore, in this study, regarding these efficient features, supercritical carbon dioxide injection would be a prominent option to increase remained natural gas production from tight reservoirs [104]. Furthermore, the higher adsorption capacity of supercritical carbon dioxide, compared with natural gas (CH 4 , C 2 H 6 , and CO 2 ), would be another influential factor in improving gas recovery from tight reservoirs [104][105][106][107].…”

“…Therefore, in this study, regarding these efficient features, supercritical carbon dioxide injection would be a prominent option to increase remained natural gas production from tight reservoirs [104]. Furthermore, the higher adsorption capacity of supercritical carbon dioxide, compared with natural gas (CH 4 , C 2 H 6 , and CO 2 ), would be another influential factor in improving gas recovery from tight reservoirs [104][105][106][107]. According to Kim et al (2017), gas recovery increase for a shale reservoir would be 24% more than regular carbon dioxide injection.…”

Experimental Analysis and Numerical Simulation of the Stability of Geological Storage of CO2: A Case Study of Transforming a Depleted Gas Reservoir into a Carbon Sink Carrier

“…CO 2 storages include ocean storage, chemical storage, and geological storage. − Geological storage of CO 2 is one of the most economical, feasible, and effective measures to slow down global warming. − The concept “carbon neutral” that promotes low-carbon development has been widely accepted by people. − Carbon neutral is an ecosystem concept proposed to achieve the goal of zero net greenhouse gas emissions. The ways to achieve carbon neutral include afforestation, energy saving and emission reduction, and the development of low-carbon energy. − These measures can be used to balance the amount of carbon released and absorbed back to the earth, so that the “zero emission” of CO 2 can be achieved. − …”