... diffusivity through the cement matrix, a novel approach based on Nuclear Magnetic Resonance (NMR) is employed. Deuterium oxide (D 2 O) imbibition to replace H 2 O in cement plugs is monitored over time to derive tortuosity. Comparing pre- and post-CO 2 exposure D 2 O intrusion profiles allows us to determine...

... frac spacing . The CFT model indicates oil in a pore system will not move until the bonding forces between the fluid phases and/or surface fields are exceeded, something that is not directly measurable at this time to this author's knowledge. Thirdly, imbibition, the spontaneous uptake of water...

... imbibition is the main mechanism by which fracture fluid enters the rock. Herein we study the spontaneous imbibition of brine to determine the flow mechanism and uptake capability of fracturing fluid in unconventional source rocks. We used NMR spectroscopy and imaging methods to track the spatial...

... Abstract Water imbibition and associated oil displacement is an important process in shale oil reservoirs after hydraulic fracturing and in water-based enhanced oil recovery. Current techniques for water imbibition measurement are mostly "black-box" type of methods. More explicit understanding...

... was doped with D2O, and another with toluene (Fig. 1(b NMR was again utilized to capture the time-lapse profile of the doping concentrations. D2O-doped and toluene-doped responses provided tortuosity of the water and the oil phases, respectively. URTeC 5118 Figure 1a. Workflow for single phase imbibition...

...URTeC: 5299 Water-Oil Displacement in Shale: New Insights from a Comparative Study Integrating Imbibition Tests and Multiscale Imaging Sheng Peng*1, Priyanka Periwal1, Robert M. Reed1 1. Bureau of Economic Geology, The University of Texas at Austin Copyright 2021, Unconventional Resources...

... completion fluid chemistry upstream oil & gas pore system plug oil permeability injection permeability complex reservoir shale reservoir imbibition surfactant gas mixture completion fluid URTeC: 3158 Impact of Completions Fluids Chemistry on Hydrocarbon Effective Permeability of Organic...

... Abstract A large amount of fracturing fluid in fracking is imbibed into the shale fracture/matrix system, which leads to a significant uncertainty in gas recovery evaluation. The mechanism of imbibition impact on the gas–water two-phase flow is not well understood. In this study, systematic...

... Spontaneous imbibition of hydraulic fracturing fluids is considered as one of the underlying causes of water loss during multistage fracturing operations. Understanding the mechanisms behind matrix imbibition rate is crucial in planning fracturing operations and optimizing production from shale...

... URTeC: 3096 Organic Shale Spontaneous Imbibition and Monitoring with NMR to Evaluate In-Situ Saturations, Wettability and Molecular Sieving Mansoor Ali*1, Safdar Ali2, Ashish Mathur1, Chad Belanger1, 1. W.D. Von Gonten Laboratories, 2. W.D. Von Gonten & Co. Copyright 2020, Unconventional Resources...

... URTeC: 2726 NMR Time-Lapse Wettability Assessments in Unconventionals: Insights from Imbibition S. Kelly1, R. J. M. Bonnie1, M. J. Dick2, D. Veselinovic2 1ConocoPhillips; 2Green Imaging Technologies Copyright 2020, Unconventional Resources Technology Conference (URTeC) DOI 10.15530/urtec-2020-2726...

... equilibrium pressure particle size saturation eagle ford shale permeability imbibition experiment shale sample oil saturation pressure vessel total pressure drop capillary pressure curve spontaneous imbibition Abstract Determination of dynamic fluid intrusion in tight oil reservoirs...

... to reduce uncertainty in reservoir simulation through determination of wettability of unconventional rocks with nanoDarcy permeabilities. Laboratory measurements of water spontaneous imbibition were made on oil-bearing unconventional core samples from the Permian Basin with nanoDarcy permeability. A Nuclear...

... relative permeability and hysteresis using a laboratory measurement technique developed through our previous work. A procedure of drainage and imbibition is adopted. After each step of drainage or imbibition, gas relative permeability was measured using the modified gas expansion method. Water relative...

..., a new method to evaluate wettability in different pore-scale was provided. Then core flooding experiments were conducted to study invasion pressure for the LNF. Finally, the efficiency of drag reduction after adding the LNF was evaluated. The result showed that imbibition and nuclear magnetic resonance...

... limestone cores by water imbibition at 347 K. Results of the contact-angle experiment show that the contact angle was rapidly reduced to 26° with 3pRB, in contrast to the contact angle of 123° with RB, without affecting the oil/brine IFT. Spontaneous imbibition results show that the oil recovery factor...

... in releasing hydrocarbons from the rock. In this study, enzyme solutions with concentrations of 10 and 5 wt.% are used on 6 different cores. Recovery factors of the spontaneous imbibition tests at this concentration were 11 and 22%, respectively, after a soak time of 200 hours. This compares to 2 and 12...

...URTeC: 194 Water/Oil Displacement by Spontaneous Imbibition Through Multiscale Imaging and Implication on Wettability in Wolfcamp Shale Sheng Peng*1, Yijin Liu2, Lucy Tingwei Ko1, William Ambrose1; 1. Bureau of Economic Geology, University of Texas at Austin, 2. SLAC National Accelerator Laboratory...

... in the literature (Lenormand et al., 1988; Zhang et al., 2011), our experiments fall approximately into the capillary fingering to viscous fingering cross-over region. We classify each drainage and imbibition data point into low (~10-7), medium (~10-6) and high (~10- 5) capillary number experiments. Table 3...

... a better understanding for project optimization. In addition, as most current studies focused on the spontaneous imbibition under atmospheric pressure, it is important to investigate the process with external pressures because hydraulic fracturing is a high-pressure driven operation. By performing both...