...Lixing Lin; Tayfun Babadagli; Huazhou (Andy) Li Summary The effects of chemical additives on mitigating water blocking and improving oil recovery were experimentally examined for gas-water and oil-water systems in spontaneous imbibition cells. In these attempts, two factors are critically important...

...-parent well interference. Our results demonstrate that 31.8% of the oil is recovered during primary production from large inorganic pores under solution-gas drive mechanism. Under countercurrent imbibition, a nonionic surfactant leaks off into the smaller organic and inorganic pores and recovers...

...% of these large pores (20–28% of total pores) storing injected gas through residual trapping after water imbibition. To address this challenge, CO 2 was foamed using a foaming agent to enhance viscous forces and overcome capillary forces. This resulted in significant improvements, including a 31% increase...

...Fei Yu; Rujun Han; Ke Xu Summary Countercurrent imbibition is the process in which the wetting fluid spontaneously displaces the nonwetting fluid, while the nonwetting fluid is recovered at the wetting fluid inlet. It is a major mechanism for the recovery of shale oil, shale gas, and tight oil...

..., demarcating the regions requires multiple experiments, including sole brine, sole oil phase, and D 2 O imbibition processes, to define oil and water distribution regions. Such fluid typing ability enables better accuracy in wettability characterization. The weighing method shows good agreement with the T 2...

... productivity. An analytical model was developed in this research to describe the dynamic spontaneous imbibition process in shale cracks owing to fluid soaking. The model was integrated with pressure falloff data to develop a mathematical approach for forecasting the optimal soaking time, which is defined...

...Pål Østebø Andersen Summary Countercurrent spontaneous imbibition (SI) experiments are among the most common multiphase experiments performed on porous rock samples. Although the samples rarely are designed to give linear flow, they are often modeled and interpreted using mathematical descriptions...

... the formation of a spatial network structure that maintains high temperature/shear resistance even after prolonged shear. Moreover, the system exhibited an exceptional capacity for imbibition oil production. Indoor spontaneous imbibition experiments showed a final recovery rate of 32.41% in tight oil cores (~10...

... pressure is a driving force for spontaneous imbibition when the salinity of the fracturing fluid is lower than that of the reservoir water, and more fluid enters the coal as the osmotic pressure increases. This causes the displacement of the high-salinity fluid already present in the micropores by the low...

...Songyan Li; Kexin Du; Yaohui Wei; Minghe Li; Zhoujie Wang Summary Imbibition is one of the main mechanisms for fluid transport in porous media. A combination of carbonated water and active water [active-carbonated water (ACW)] has great prospects in enhanced oil recovery (EOR) and carbon reduction...

...Ying Yang; Jianguang Wei; Erlong Yang; Fahimeh Hadavimoghaddam; Mehdi Ostadhassan; Shuang Liang; Xiaofeng Zhou Summary Microscopic assessment of oil distribution and imbibition mechanisms within shale formations lays the groundwork for future development strategies. In this regard, the Songliao...

... imbibition on CBM recovery are still unclear. In this study, spontaneous and forced water imbibition experiments in methane-bearing low-volatile bituminous (LVB) coal were conducted at various gas adsorption equilibrium pressures, following which methane desorption and diffusion experiments were performed...

...Bing Wei; Qinzhi Li; Weipeng Yang; Yiwen Wang; Jun Lu; Jinyu Tang Summary Spontaneous imbibition can help to improve the oil recovery of unconventional reservoirs owing to the significant capillarity. Although the dependence of imbibition dynamics of surfactants on wettability and interfacial...

...Yue Shi; Fangya Niu; Kishore Mohanty Summary Oil-wetness and heterogeneity are two key reasons for low oil recovery by waterflooding in carbonate reservoirs. Surfactants have been effective in altering the oil-wet matrix to a more water-wet condition and initiating spontaneous imbibition. Because...

...Bing Wei; Lele Wang; Runxue Mao; Guanqun Yu; Dianlin Wang; Jun Lu; Jinyu Tang Summary Surfactant-induced imbibition is considered a promising method for increasing oil recovery from tight oil reservoirs beyond primary production. Nanoemulsion (nE) offers a great potential for this application owing...

... of the 3D pore network. Permeability is modeled by applying the modified Hagen-Poiseuille equation, Darcy’s law, energy and mass conservation, and the effect of eddy formation and flow direction change in the pores to the constructed 3D pore network model. Relative permeability is modeled for the imbibition...

... for numerous primary drainage (PD) and imbibition cycles at a constant contact angle of 0° for the wetting phase. Simultaneous measurements of capillary pressure, relative permeability, saturation, and phase connectivity are made for each displacement. The fluid-fluid IA is calculated from the PNM capillary...

...Lan Mei; Wei Wei; Jianchao Cai; Qingbang Meng Summary The fluid exchange behavior for counter-current imbibition in fractured reservoirs can be quantitatively characterized by the transfer function in numerical simulation. The time-dependent shape factor (TDSF) in the transfer function is one...

... flooding. The heterogeneous coreflood test was proposed to model bypassing in low-permeability matrix during waterfloods, and dynamic imbibition of surfactant into the low-permeability matrix. Surfactant retention results suggest that retention increases as initial oil saturation decreases. The retention...

...Zhilin Cheng; Hui Gao; Zhengfu Ning; Chen Wang; Teng Li Summary The color-gradient lattice Boltzmann (LB) method is used to investigate the inertial effect on oil/water countercurrent imbibition characteristics in a matrix-fracture system. The interplay between capillarity, fluid inertia...