Investigation on pore structure, fluid mobility and water huff-n-puff oil recovery of tight volcanic oil reservoir

Li, Shuai; Yang, Shenglai; Jin, Lei; Shen, Bin; Qian, Kun; Yu, Jing

doi:10.1016/j.petrol.2022.110651

Cited by 4 publications

(5 citation statements)

References 29 publications

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“…However, the second cycle of water injection huff-n-puff with different injection volumes has a limited increase in oil recovery and relatively short production time, about 750 s. After the first cycle of water injection huff-n-puff, the water saturation in the reservoir is relatively high, which could limit the increase of imbibition recovery and reverse displacement recovery. The research conclusion is similar to that of Li et al 42 It is necessary to further optimize the process parameters and the huff-n-puff medium in multiple huff-n-puff EOR tests.…”

Section: Variation Law Of Oil Recovery In Differentsupporting

confidence: 80%

“…41 Li et al carried out a water injection huff-n-puff experiment on a tight volcanic rock reservoir and discovered that the first two cycles had an effect greater than 20%, which indicated a high-efficiency oil recovery period. 42 However, these physical simulation methods is unable to reproduce the production behavior of actual tight reservoirs. 19 In this paper, a three-dimensional, physical simulation experiment method of water injection huff-n-puff to improve the oil recovery of tight reservoirs has been established.…”

Section: Introductionmentioning

confidence: 99%

“…Rao et al designed a reverse engineering design model to examine the process parameters of water injection huff-n-puff . Li et al carried out a water injection huff-n-puff experiment on a tight volcanic rock reservoir and discovered that the first two cycles had an effect greater than 20%, which indicated a high-efficiency oil recovery period . However, these physical simulation methods is unable to reproduce the production behavior of actual tight reservoirs …”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Oil Production Mechanism of Water Injection Huff-n-Puff for Enhancing Oil Recovery in Tight Sandstone Reservoir

Ji,

Yu,

Liu

et al. 2023

Energy Fuels

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It is difficult to establish an effective injection production well pattern in tight reservoirs, and water injection huff-n-puff is an important technology for EOR in late elastic energy development. The water injection huff-n-puff is established with a three-dimensional physical simulation experiment. The boundary conditions are simulated by setting up a pressure buffer device. The injection and production processes of horizontal wells are simulated by prefabricated artificial fractures at the injection port. The variation laws of 29 pressure points and 130 resistivity points can be effectively detected. Two cycles of experiments with different injection volumes are carried out, the change process of pressure and resistivity is analyzed, and the oil production mechanism is described. The fluid transfer velocity along the fracture extension direction is higher than that in the vertical fracture extension direction. The effect of the first cycle of the water injection huff-n-puff is significantly better than that of the second cycle. The change rule of oil recovery and oil change rate with different injection volumes shows that there is an optimal injection volume to maximize the on-site implementation benefits. The experimental results provide a theoretical and experimental basis for EOR by a water injection huff-n-puff in tight reservoirs.

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Section: Variation Law Of Oil Recovery In Differentsupporting

confidence: 80%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Oil Production Mechanism of Water Injection Huff-n-Puff for Enhancing Oil Recovery in Tight Sandstone Reservoir

Ji,

Yu,

Liu

et al. 2023

Energy Fuels

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“…In a long-term study, the authors and the Tuha Oilfield have conducted a lot of research on the relationship between NMR transverse relaxation time and pore radius of TVR based on the high-pressure mercury intrusion experiment and NMR test experiment of several cores. The conversion process is shown in Figure …”

Section: Resultsmentioning

confidence: 99%

“…The conversion process is shown in Figure 6. 34 According to the conversion result of step ⑤ in Figure 6, select a set of data with the highest correlation between ln r and ln T 2 and then convert according to the equation in step ④ in Figure 6 to obtain the relationship between the T 2 value of NMR and the pore radius r of TVR. As shown in eq 1…”

Section: Resultsmentioning

confidence: 99%

Influence of Water Injection Pressure and Method on Oil Recovery of Water Injection Huff and Puff in Tight Volcanic Oil Reservoirs

Yang

Dong

et al. 2022

ACS Omega

Self Cite

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The water injection huff and puff (WIHP) technology is regarded as one of the important means to improve the recovery factor (RF) of tight volcanic oil reservoirs (TVORs), but the influence of water injection pressure (WIP) and water injection method (WIM) on the oil recovery effect of WIHP has been rarely reported. In this paper, we first collected the real full-diameter cores from a TVOR and then simulated the distribution characteristics of fractures and matrix pores after hydraulic fracturing of the reservoir through the combination and cutting of the cores. Finally, we used the large-sized physical simulation device for tight oil WIHP that can bear high temperature and high pressure and a nuclear magnetic resonance instrument to conduct experiments of five cycles of constant pressure WIHP (CWIHP) with WIPs of 25, 32.5, and 40 MPa and step-by-step pressure rising WIHP (SWIHP) (the WIP was 25, 30, 33, 37, and 40 MPa in order) and obtained the liquid production law and mechanism of tight volcanic rock (TVR) under CWIHP and SWIHP. The result shows that under the CWIHP mode, the RF of TVR has a good power-law-positive correlation with the WIP. However, with the increase of WIHP cycles, the RF of CWIHP always decreases rapidly. In the WIHP of TVR, the injected water mainly collects oil in large pores (the pore radius is greater than 0.1 μm), and the closer the area to the outlet end of oil production and the higher the fracture density, the higher the RF. SWIHP can also effectively improve the RF of TVR, but compared with CWIHP with a WIP of 40 MPa, the amount of recovered oil decreases relatively slowly with the increase of WIHP cycles. In the first two cycles of the five cycles of WIHP, the RF of CWIHP was higher, but from the third cycle, the RF of SWIHP begins to be greater, and the more the number of cycles of WIHP, the more obvious the advantage of SWIHP. When the number of WIHP cycles exceeds 5, the oil recovery effect and the economy of SWIHP are better. This study can provide a solid theoretical basis for the efficient development of WIHP in TVORs.

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Experimental investigation on enhancing oil recovery of volcanic fractured oil reservoir by gas injection huff-n-puff considering gas diffusion

Yao,

Chen,

Liu

et al. 2024

Physics of Fluids

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The pore structure of volcanic fractured oil reservoirs is complicated, and the traditional gas displacement and waterflooding are not ideal. In this paper, the pore structure characteristics of volcanic rock were analyzed. Then, the diffusion procedure of CO2 and natural gas in saturated oil porous media was analyzed by pressure drop method. Finally, huff-n-puff experiments of CO2 and natural gas were conducted to analyze factors on the recovery factor (RF), and the oil mobilization pattern was quantitatively characterized. By huff-n-puff, we mean injecting gas from one end and then soaking it for a period of time before producing oil, utilizing pressure-driven and physicochemical reactions to affect the oil. The results show that the pore size distribution range is large. The diffusion of CO2 and natural gas can be divided into three stages: rapid diffusion, slow diffusion and equilibrium, and the diffusion coefficient of CO2 is 10 times that of natural gas under same condition. Compared with vertical fractures and horizontal fractures, reticulate fractures have more influence on gas diffusion coefficient. After 6 cycles, the RF of CO2 is 15% higher than that of natural gas, and the contribution of the first 4 cycles to the RF is 91.38%. In addition, CO2 huff-n-puff primarily mobilizes oil in medium (0.1 μm < r < 1 μm) and large (r > 1 μm) pores. These research results can provide a good theoretical guidance for the efficient development of VFOR and CO2 sequestration.

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Investigation on pore structure, fluid mobility and water huff-n-puff oil recovery of tight volcanic oil reservoir

Cited by 4 publications

References 29 publications

Oil Production Mechanism of Water Injection Huff-n-Puff for Enhancing Oil Recovery in Tight Sandstone Reservoir

Oil Production Mechanism of Water Injection Huff-n-Puff for Enhancing Oil Recovery in Tight Sandstone Reservoir

Influence of Water Injection Pressure and Method on Oil Recovery of Water Injection Huff and Puff in Tight Volcanic Oil Reservoirs

Experimental investigation on enhancing oil recovery of volcanic fractured oil reservoir by gas injection huff-n-puff considering gas diffusion

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