Investigation of Surfactant Huff-n-Puff Injection for Enhanced Oil Recovery in Unconventional Reservoirs: An Integrated Experimental and Numerical Simulation Approach Coupled with the HLD-NAC Methodology

Lu, Chunhua; Zhang, Miao; Hua, Yilei; Liu, Ming; Jiang, Hanqiao; Li, Junjian

doi:10.1021/acs.energyfuels.3c03965

Cited by 2 publications

(3 citation statements)

References 34 publications

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“…For the shut-in time influence, no sensitivity was observed from all displacing fluids (see Figure d). The result obtained is similar to those of the previous studies by Cao and Lu, where different periods of shut-in time were investigated, and little changes were observed in the oil production results. This is believed to be due to an indistinguishable pressure buildup when the well is shut in, as exemplified in the previous section (Figure c).…”

Section: Resultssupporting

confidence: 90%

“…Wei investigated a scaling-up to reservoir-scale modeling on a potential of low-salinity water huff-n-puff method, with key factors of injection timing, fluid volume, and a number of cycles found sensitive to the oil production. The authors also realized that the soaking time has no influence on the oil recovery, as found by Sun and Lu, implying that there is suitability of factors in designing the project.…”

Section: Introductionmentioning

confidence: 75%

“…In the current study, the results from the imbibition experiment will be used to characterize characteristics of the two-phase flow in the porous rock, namely, relative permeability ( k r ) and capillary pressure ( p c ), as discussed below, and the two characteristics will then be used for numerical reservoir simulation as the main investigation of the current work. Since the spontaneous imbibition experiment referred is capillary-dependent, the reservoir-scale development of the oil production is designed to be the huff-n-puff method, , where the gravitational and viscous forces are unlikely to contribute to the oil recovery. , …”

Section: Experiments and Fluid Flow Characteristicsmentioning

confidence: 99%

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Relative Permeability-Dictated Huff-n-Puff Technique in Tight Reservoirs: Suitability and Limitation toward Field Implementation

Tapanya,

Fongkham,

Ramadhan

et al. 2024

Energy Fuels

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Exploiting unconventional petroleum is needed in this era, and thus more enhancement has been introduced including chemical additives to manipulate the fluid flow characteristics. Although most of the examinations were at the laboratory scale, the scaling-up to reservoir applicability is in question and needs further studies. The current study examined laboratory-derived relative permeability (k r ) at various wettabilities and the oil−water interfacial tension on reservoir-scale numerical simulation, utilizing a huff-n-puff technique, aiming to emphasize suitability and limitations of k r . The simulated results emphasized the important character of k r , which dictates the oil recovery in tight reservoirs where the huff-n-puff technique is normally implemented. Although derived from laboratory tests, such a k r character has to be taken caution when considering EOR design in field deployment at the reservoir scale since there are suitability and limitations to be concerned for each k r character as well as the economic aspect. Not all reservoir parameters or producing factors could practically induce substantial changes in oil production; hence, further techno-economic study should be executed prior to implementation toward field implementation of tight reservoirs. Simulations of primary oil production agreed with those of the experiment, confirming the model validity. Following the secondary six-cycle huff-n-puff process also yielded the same trend of oil production performances, dictated by k r as a primary fluid flow characteristic. Four influencing factors of reservoir properties and producing design were further investigated for their sensitivity to the oil production performances. At various k r investigated in the current study, the porosity factor was distinctively found to have limited suitability to low values if high oil production is anticipated, owing to the nature of tight reservoirs pe se. On the contrary, reservoir permeability likely did not have much influence since more oil was produced with higher value of permeability, albeit no sensitivity at much higher values. The shut-in period for the huff-n-puff process was not sensitive to the oil production of all fluids. Interestingly, the critical water saturation where the water phase starts to flow (k rw > 0) had a strong influence on the oil production in two approaches, either demoting the oil production or having no contribution, depending on the k rw −S w character. Although derived from laboratory tests, such a k r character has to be taken caution when considering enhanced oil recovery design in reservoir-scale deployment since there are suitability and limitations to be concerned for each k r character.

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Section: Resultssupporting

confidence: 90%

Section: Introductionmentioning

confidence: 75%