Effect of residual natural gas saturation on multiphase flow behaviour during CO2geo-sequestration in depleted natural gas reservoirs
MetadataShow full item record
Hydrocarbon reservoirs, either depleted or active, present a large potential storage volume for geological CO2 sequestration. However, compared to other candidate storage sites e.g. deep saline aquifers, unminable coal seams, etc., in particular, they present a degree of uncertainty associated with potential effects of residual hydrocarbon, left behind during the hydrocarbon production operation, on the sequestration process. This can create a challenge when it comes to modelling the multiphase flow characteristics of the underground fluid-rock system over both short and long term.This paper presents in details the equipment, procedure, protocol and the results of a series of core-flooding experiments conducted to understand the extent of the effects that the existence of residual natural gas saturation can have on the multiphase flow characteristics of the fluid-rock system during CO2 geo-sequestration in sandstone reservoirs. With this knowledge, from the multiphase flow behaviour point of view, some of the uncertainties involved in sequestrating CO2 in depleted natural gas reservoirs can be properly addressed. The experimental results obtained here show that the presence of residual natural gas saturation can have significant impact on the multiphase flow characteristics of the fluid-rock system during CO2 geo-sequestration in depleted gas reservoirs. Despite what some researchers believe, based on the results obtained, injecting CO2 into such geological media may not provide additional secure storage capacity as any additional gas stored in the form of the desired residual saturation easily becomes mobile again putting additional strain on any overlaying seal. Also, the generated experimental data show that storing CO2 into depleted gas reservoirs may suffer from low injectivity during the early stages of the operation, however, the injectivity is expected to improve over time with further injection.
Showing items related by title, author, creator and subject.
Al-Abri, Abdullah S. (2011)Perhaps no other single theme offers such potential for the petroleum industry and yet is never fully embraced as enhanced hydrocarbon recovery. Thomas et al. (2009, p. 1) concluded their review article with “it appears ...
Raza, A.; Gholami, Raoof; Rezaee, M. Reza; Bing, C.; Ramasamy, Nagarajan; Hamid, M. (2017)Carbon capture and sequestration technology is a major approach developed to mitigate the amount of greenhouse gases released into the atmosphere. Technically, depleted oil and gas reservoirs are one of the feasible ...
Saeedi, Ali (2011)A range of variable factors are expected to influence multiphase flow during CO2 geological sequestration. In order to investigate the effects of a number of these factors, a range of core-flooding experiments was carried ...