scholarly journals Dynamic capillarity during displacement process in fractured tight reservoirs with multiple fluid viscosities

2019 ◽  
Vol 8 (2) ◽  
pp. 300-311 ◽  
Author(s):  
Ying Li ◽  
Hongwen Luo ◽  
Haitao Li ◽  
Shengnan Chen ◽  
Xiaorong Jiang ◽  
...  
Keyword(s):  
Tight Reservoirs ◽  
Dynamic Capillarity

A brief review of dynamic capillarity effect and its characteristics in low permeability and tight reservoirs

2020 ◽  
Vol 189 ◽  
pp. 106959 ◽  
Author(s):  
Ying Li ◽  
Hongwen Luo ◽  
Haitao Li ◽  
Xiangjun Liu ◽  
Yongsheng Tan ◽  
...  
Keyword(s):  
Low Permeability ◽  
Tight Reservoirs ◽  
Dynamic Capillarity

scholarly journals Ball sealer tracking and seating of temporary plugging fracturing technology in the perforated casing of a horizontal well

2021 ◽  
pp. 014459872110204
Author(s):  
Wan Cheng ◽  
Chunhua Lu ◽  
Guanxiong Feng ◽  
Bo Xiao
Keyword(s):  
Critical Parameter ◽  
Fluid Velocity ◽  
Stable State ◽  
Horizontal Wells ◽  
Terminal Velocity ◽  
Injection Rate ◽  
Fracturing Fluid ◽  
Perforation Hole ◽  
Horizontal Wellbore ◽  
Tight Reservoirs

Multistaged temporary plugging fracturing in horizontal wells is an emerging technology to promote uniform fracture propagation in tight reservoirs by injecting ball sealers to plug higher-flux perforations. The seating mechanism and transportation of ball sealers remain poorly understood. In this paper, the sensitivities of the ball sealer density, casing injection rate and perforation angle to the seating behaviors are studied. In a vertical wellbore section, a ball sealer accelerates very fast at the beginning of the dropping and reaches a stable state within a few seconds. The terminal velocity of a non-buoyant ball is greater than the fluid velocity, while the terminal velocity of a buoyant ball is less than the fluid velocity. In the horizontal wellbore section, the terminal velocity of a non-buoyant or buoyant ball is less than the fracturing fluid flowing velocity. The ball sealer density is a more critical parameter than the casing injection rate when a ball sealer diverts to a perforation hole. The casing injection rate is a more critical parameter than the ball sealer density when a ball sealer seats on a perforation hole. A buoyant ball sealer associated with a high injection rate of fracturing fluid is highly recommended to improve the seating efficiency.

scholarly journals Modeling Near-Miscible Gas Foam Injection in Fractured Tight Rocks and Its Challenges

Energies ◽  
2021 ◽  
Vol 14 (7) ◽  
pp. 1998
Author(s):  
Haishan Luo ◽  
Kishore K. Mohanty
Keyword(s):  
Oil Recovery ◽  
Fractured Rock ◽  
Gas Injection ◽  
Gas Composition ◽  
Gas Oil ◽  
Rock Matrix ◽  
Reducing Gas ◽  
Tight Reservoirs ◽  
Modeling Strategy ◽  
Tight Rocks

Unlocking oil from tight reservoirs remains a challenging task, as the existence of fractures and oil-wet rock surfaces tends to make the recovery uneconomic. Injecting a gas in the form of a foam is considered a feasible technique in such reservoirs for providing conformance control and reducing gas-oil interfacial tension (IFT) that allows the injected fluids to enter the rock matrix. This paper presents a modeling strategy that aims to understand the behavior of near-miscible foam injection and to find the optimal strategy to oil recovery depending on the reservoir pressure and gas availability. Corefloods with foam injection following gas injection into a fractured rock were simulated and history matched using a compositional commercial simulator. The simulation results agreed with the experimental data with respect to both oil recovery and pressure gradient during both injection schedules. Additional simulations were carried out by increasing the foam strength and changing the injected gas composition. It was found that increasing foam strength or the proportion of ethane could boost oil production rate significantly. When injected gas gets miscible or near miscible, the foam model would face serious challenges, as gas and oil phases could not be distinguished by the simulator, while they have essentially different effects on the presence and strength of foam in terms of modeling. We provide in-depth thoughts and discussions on potential ways to improve current foam models to account for miscible and near-miscible conditions.

Organic matter characterization of the Lower Cretaceous tight reservoirs in the Danish North Sea

2021 ◽  
Vol 238 ◽  
pp. 103714
Author(s):  
Arka Rudra ◽  
Hamed Sanei ◽  
H.P. Nytoft ◽  
H.I. Petersen ◽  
Carlette Blok ◽  
...  
Keyword(s):  
Organic Matter ◽  
North Sea ◽  
Lower Cretaceous ◽  
Tight Reservoirs

scholarly journals Formation mechanism of authigenic chlorite in tight sandstone and its influence on tight oil adsorption, Triassic Ordos Basin, China

2020 ◽  
Vol 38 (6) ◽  
pp. 2667-2694
Author(s):  
Qianshan Zhou ◽  
Chengfu Lv ◽  
Chao Li ◽  
Guojun Chen ◽  
Xiaofeng Ma ◽  
...  
Keyword(s):  
Adsorption Capacity ◽  
Formation Mechanism ◽  
Pore Space ◽  
Ordos Basin ◽  
Reservoir Quality ◽  
Tight Oil ◽  
Pressurized Water ◽  
Tight Reservoirs ◽  
Pore Lining ◽  
Scanning Electron

In this study, the formation mechanism of authigenic chlorite in tight reservoirs and its influence on the adsorption capacity to tight oil have been analyzed. The occurrence states of chlorite and the formation mechanism have been analyzed by thin section (TS) and field emission scanning electron microscopy (FE-SEM) measurements. Due to the alteration of volcanic rock fragments, the mudstone pressurized water, and the dissolution of early chlorite, the material source has been provided for the formation of chlorite. The formation time of chlorite with different occurrence states is in the following order: grain-coating chlorite → pore-lining chlorite → pore-lining chlorite in dissolved pores → rosette chlorite. Authigenic chlorite developed in the reservoirs has influenced the change of the reservoir quality in two respects. On the one hand, authigenic chlorite can protect the residual pores, improve the anti-compaction capacity of the reservoir, and provide certain inter-crystalline space. On the other hand, it can hinder pore space and inhibit throat, resulting in a decrease in the connectivity of pores and the increase in the heterogeneity of the reservoir. Tight oil absorbed by the chlorite is mainly in the form of the thin film and aggregates. Through in situ testing of environmental scanning electron microscope (ESEM) and energy dispersive spectrum (EDS), the adsorption capacity of chlorite with different occurrence states to tight oil, being in the following order: rosette chlorite > pore-lining chlorite > pore-lining chlorite in dissolved pores > grain-coating chlorite. Furthermore, the controlling factors on reservoir quality, the content of chlorite and content of Fe and K have been investigated, and the adsorption capacity of different chlorite types has been studied, which can provide guidance for analysis of the control factors on the difference in adsorption capacity of different occurrence states of chlorite to tight oil in tight reservoirs.

Effect of Chemical Partition Behavior on Oil Recovery by Wettability Alteration in Fractured Tight Reservoirs

2022 ◽  
Author(s):  
Tesleem Lawal ◽  
Mingyuan Wang ◽  
Gayan A. Abeykoon ◽  
Francisco J. Argüelles-Vivas ◽  
Ryosuke Okuno
Keyword(s):  
Oil Recovery ◽  
Wettability Alteration ◽  
Tight Reservoirs ◽  
Chemical Partition ◽  
Partition Behavior
Sign in / Sign up

Export Citation Format

Share Document