Experimental study on nitrogen drive and foam assisted nitrogen drive in varying-aperture fractures of carbonate reservoir

Wen, Yuchen; Qu, Ming; Hou, Jirui; Liang, Tuo; Raj, I. Loyola Poul; Ma, Shixi; Yuan, Nuo

doi:10.1016/j.petrol.2019.06.028

Cited by 23 publications

(11 citation statements)

References 6 publications

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“…In the lower fracture, the pressure difference (Fig. 8) at the curved interface of nitrogen gas and simulated oil points to the inlet according to Laplace's eqn (1). Owing to the presence of pressure difference (Dp), it is possible for nitrogen gas to ow backward gradually until nitrogen gas returns to the fractures' intersection (Fig.…”

Section: Resultsmentioning

confidence: 99%

“…The effect of gravity differentiation on the oil–gas interface or flow characteristics still exists when nitrogen gas migrates forward in fractures. Wen 1 systematically studied the migration characteristics of nitrogen gas in fractures with different values of opening width. The results indicated that the flow pattern of nitrogen gas in fractures can be affected by gravity differentiation of displacing and displaced phase.…”

Section: Resultsmentioning

confidence: 99%

“…4 Besides, systematical experiments on nitrogen and foam ow behaviors in macro visual models have been analyzed and reported. 1,[15][16][17] These macro-visual models are designed and fabricated based on the similarity criterion. In this work, four types of micro-visual fracture-vuggy models are designed and fabricated based on the SEM images of outcrop cores obtained from Tahe oileld to observe and reveal the ow behaviors of uids.…”

Section: Introductionmentioning

confidence: 99%

“…Moreover, recovered oil and gas production account for about 60% of the world's total recovered oil and gas production, of which more than 30% are contributed by fracture-vuggy carbonate reservoirs. 1–3 The most distinct feature of fracture-vuggy carbonate reservoirs is that the fracture is the main flow channel for fluids, while vuggy is the main storage space for crude oil. 4 Tahe oilfield, located in northwest China, belongs to a typical fracture-vuggy carbonate reservoir.…”

Section: Introductionmentioning

confidence: 99%

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Flow behaviors of nitrogen and foams in micro-visual fracture-vuggy structures

Liang

Hou

et al. 2021

RSC Adv.

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Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Flow behaviors of nitrogen and foams in micro-visual fracture-vuggy structures

Liang

Hou

et al. 2021

RSC Adv.

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“…11. Foam flooding and foam plugging have been shown to have a beneficial effect on the development of carbonate reservoirs (Wen et al 2019;Hou et al 2018;Li et al 2020b). However, under high-temperature and high-salinity (HTHS) conditions, foam stability remains challenging for two reasons.…”

Section: Asp Flooding and Foam Floodingmentioning

confidence: 99%

A review of development methods and EOR technologies for carbonate reservoirs

et al. 2020

Pet. Sci.

144

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Carbonate reservoirs worldwide are complex in structure, diverse in form, and highly heterogeneous. Based on these characteristics, the reservoir stimulation technologies and fluid flow characteristics of carbonate reservoirs are briefly described in this study. The development methods and EOR technologies of carbonate reservoirs are systematically summarized, the relevant mechanisms are analyzed, and the application status of oil fields is catalogued. The challenges in the development of carbonate reservoirs are discussed, and future research directions are explored. In the current development processes of carbonate reservoirs, water flooding and gas flooding remain the primary means but are often prone to channeling problems. Chemical flooding is an effective method of tertiary oil recovery, but the harsh formation conditions require high-performance chemical agents. The application of emerging technologies can enhance the oil recovery efficiency and environmental friendliness to a certain extent, which is welcome in hard-to-recover areas such as heavy oil reservoirs, but the economic cost is often high. In future research on EOR technologies, flow field control and flow channel plugging will be the potential directions of traditional development methods, and the application of nanoparticles will revolutionize the chemical EOR methods. On the basis of diversified reservoir stimulation, combined with a variety of modern data processing schemes, multichannel EOR technologies are being developed to realize the systematic, intelligent, and cost-effective development of carbonate reservoirs.

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Investigations on the oxygen corrosion behaviors of P110 steel in a dynamic experiment simulating nitrogen injection

Zeng

Lin

et al. 2020

Materials & Corrosion

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Nitrogen injection is widely applied to enhance oil recovery, but the corrosion failure risk of tubing and casing is increased by residual oxygen in nitrogen. In this study, the corrosion behaviors of P110 steel under dynamic conditions with different oxygen partial pressures (2.5–0.003 MPa) simulating high‐pressure (30 MPa) nitrogen injection were studied. The morphology and composition of corrosion products were characterized by scanning electron microscopy, energy‐dispersive X‐ray spectroscopy and energy‐dispersive X‐ray analysis methods; furthermore, the localized corrosion rate and three‐dimensional surface morphologies were analyzed. The results show that the general corrosion rate decreased significantly with decreasing O2 partial pressure, especially when O2 partial pressure was below 0.5 MPa, and there is a corrosion morphology change from general corrosion to localized corrosion (pitting). Besides, the localized corrosion rates are about 20 times the general corrosion rates. The corrosion products are mainly FeOOH and Fe3O4. In addition, the scales in the intact area are relatively flat and dense, whereas the damaged scales are porous and brittle. Fluid flows not only changed the morphologies and microstructures, resulting in a more protective product layer but also promoted the transfer of the corrosive mediators and affected the development of localized corrosion.

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Experimental study on nitrogen drive and foam assisted nitrogen drive in varying-aperture fractures of carbonate reservoir

Cited by 23 publications

References 6 publications

Flow behaviors of nitrogen and foams in micro-visual fracture-vuggy structures

Flow behaviors of nitrogen and foams in micro-visual fracture-vuggy structures

A review of development methods and EOR technologies for carbonate reservoirs

Investigations on the oxygen corrosion behaviors of P110 steel in a dynamic experiment simulating nitrogen injection

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