CO2 Storage with Enhanced Gas Recovery CS-EGR in Conventional and Unconventional Gas Reservoirs in Australia

2020 ◽  
Author(s):  
Hongcai Wang ◽  
Reza Rezaee
Keyword(s):  
Co2 Storage ◽  
Gas Reservoirs ◽  
Unconventional Gas ◽  
Enhanced Gas Recovery ◽  
Gas Recovery ◽  
Unconventional Gas Reservoirs

scholarly journals Co-Optimization of CO2 Storage and Enhanced Gas Recovery Using Carbonated Water and Supercritical CO2

Energies ◽  
2021 ◽  
Vol 14 (22) ◽  
pp. 7495
Author(s):  
Abdirizak Omar ◽  
Mouadh Addassi ◽  
Volker Vahrenkamp ◽  
Hussein Hoteit
Keyword(s):  
Co2 Storage ◽  
Uncertainty Assessment ◽  
Co2 Injection ◽  
Gas Reservoirs ◽  
Enhanced Gas Recovery ◽  
Gas Recovery ◽  
Structured Design ◽  
Perform Sensitivity Analysis ◽  
Carbonated Water

CO2-based enhanced gas recovery (EGR) is an appealing method with the dual benefit of improving recovery from mature gas reservoirs and storing CO2 in the subsurface, thereby reducing net emissions. However, CO2 injection for EGR has the drawback of excessive mixing with the methane gas, therefore, reducing the quality of gas produced and leading to an early breakthrough of CO2. Although this issue has been identified as a major obstacle in CO2-based EGR, few strategies have been suggested to mitigate this problem. We propose a novel hybrid EGR method that involves the injection of a slug of carbonated water before beginning CO2 injection. While still ensuring CO2 storage, carbonated water hinders CO2-methane mixing and reduces CO2 mobility, therefore delaying breakthrough. We use reservoir simulation to assess the feasibility and benefit of the proposed method. Through a structured design of experiments (DoE) framework, we perform sensitivity analysis, uncertainty assessment, and optimization to identify the ideal operation and transition conditions. Results show that the proposed method only requires a small amount of carbonated water injected up to 3% pore volumes. This EGR scheme is mainly influenced by the heterogeneity of the reservoir, slug volume injected, and production rates. Through Monte Carlo simulations, we demonstrate that high recovery factors and storage ratios can be achieved while keeping recycled CO2 ratios low.

The Feasibility Appraisal for CO2 Enhanced Gas Recovery of Tight Gas Reservoir: Case Analysis and Economic Evaluation

2021 ◽  
Author(s):  
Ying Jia ◽  
Yunqing Shi ◽  
Jin Yan
Keyword(s):  
Natural Gas ◽  
Greenhouse Gas Emission ◽  
Co2 Storage ◽  
Tight Gas ◽  
Gas Reservoirs ◽  
Gas Reservoir ◽  
Enhanced Gas Recovery ◽  
Tight Gas Reservoirs ◽  
Gas Recovery ◽  
Tight Gas Reservoir

Abstract Tight gas reservoirs are widely distributed in China, which occupies one-third of the total resources of natural gas. The typical development method is under primary depletion. However, the recovery of tight gas is only around 20%. It is necessary to explore a new technique to improve tight gas recovery. Injecting CO2 into tight gas reservoirs is a novel trial to enhance gas recovery. The objective of this work is to verify and evaluate the effect supercritical CO2 on enhancing gas recovery and analyze the feasibility of CO2 enhance gas recovery of tight gas reservoir. Taken DND tight sandstone gas reservoir in North China as an example, 34 wells of DK13 wellblock were chosen as CO2 Enhanced gas recovery pilot area with 10-year production history. Six injection scenarios were studied. Numerical simulation indicated that the recovery of the gas reservoir of DK13 well area was improved by 8-9.5 percent when CO2 content of producers reaches 10 percent. The annual CO2 Storage would be 62 million cubic meters (110 thousand tons) and the total CO2 storage would be around 800million cubic meters (1.5 million tons). After the environmental parameter evaluation of injectors and producers, the anticorrosion schemes were put forward and the feasibility evaluation and schemes of facilities were presented. The analysis results indicated that DK13 wellblock was suitable for CO2 enhanced gas recovery no matter geologic condition, injection & production technology and facilities. However, under the current economic conditions, DK13 wellblock was not suitable for CO2to enhance gas recovery. However, if gas price rise or low carbon strategy implement, the pilot test could be carried out. In brief, CO2 could be an attractive option to successfully displace natural gas and decrease CO2 emissions, which is a promising technology for reducing greenhouse gas emission and increasing the ultimate gas recovery of tight gas reservoirs. This economic analysis, along with reservoir simulation and laboratory studies that suggest the technical feasibility of CSEGR, demonstrates that CSEGR can be feasible and that a field pilot study of the process should be undertaken to test the concept further.

Prediction of Uncertainty in Exploration of Unconventional Gas Reservoirs

2010 ◽  
Author(s):  
Mohan Gajanan Kelkar ◽  
Kyle Everett Bonney ◽  
Phillip Alan Bonney
Keyword(s):  
Gas Reservoirs ◽  
Unconventional Gas ◽  
Unconventional Gas Reservoirs
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