scholarly journals Review on Pore Structure Characterization and Microscopic Flow Mechanism of CO 2 Flooding in Porous Media

2020 ◽  
Vol 9 (1) ◽  
pp. 2000787
Author(s):  
Yong Tang ◽  
Chengxi Hou ◽  
Youwei He ◽  
Yong Wang ◽  
Yulin Chen ◽  
...  
Keyword(s):  
Porous Media ◽  
Pore Structure ◽  
Structure Characterization ◽  
Flow Mechanism ◽  
Microscopic Flow

Predicting the Performance of the Acid-Stimulation Treatments in Carbonate Reservoirs With Nondestructive Tracer Tests

SPE Journal ◽  
2015 ◽  
Vol 20 (06) ◽  
pp. 1238-1253 ◽  
Author(s):  
A.S.. S. Zakaria ◽  
H.A.. A. Nasr-El-Din ◽  
M.. Ziauddin
Keyword(s):  
Porous Media ◽  
Pore Structure ◽  
Carbonate Rocks ◽  
Tracer Tests ◽  
Structure Characterization ◽  
Hydrochloric Acid Concentration ◽  
Thin Sections ◽  
Characterization Methods ◽  
Core Samples ◽  
Flow Through

Summary Carbonate formations are very complex in their pore structure and exhibit a wide variety of pore classes, such as interparticle porosity, moldic porosity, vuggy porosity, and microporosity. Geologists have defined carbonate pore classes on the basis of sedimentology, thin sections, and porosity/permeability relationships, but the question remains concerning how these pore classes govern the acid flow through porous media. Core samples from six different carbonates, mainly limestone, were selected for the study. The samples were first investigated with thin-section analysis, high-pressure mercury-injection tests, and nuclear-magnetic-resonance measurements for pore-structure characterization, and X-ray diffraction for mineralogy examination. Next, tracer experiments were conducted, and the tracer-concentration profiles were analyzed to quantify the carbonate pore-scale heterogeneity. The heterogeneity is expressed with a parameter f—the available fraction of pore structure contributing to the flow. The data were used to study the flow of acid through carbonate rocks and correlate the pore classes to the acid response. More than 30 acid-coreflood experiments were conducted at 150°F and a hydrochloric acid concentration of 15 wt% on 1.5 × 6-in. core samples at different injection rates on each carbonate rock type. The objective of these sets of experiments is to determine the acid pore volume to breakthrough for each carbonate pore class. The findings of this study help us to connect the results from different characterization methods to the acid flow through the porous media of carbonate rocks. It was also found that the response of the acid depends on the carbonate pore classes. Application to the design of matrix acid treatments in carbonate rocks is discussed.

scholarly journals Review on Phase Behavior in Tight Porous Media and Microscopic Flow Mechanism of CO2 Huff-n-Puff in Tight Oil Reservoirs

Geofluids ◽  
2020 ◽  
Vol 2020 ◽  
pp. 1-15
Author(s):  
Yong Tang ◽  
Jiehong Tang ◽  
Qi Liu ◽  
Yong Wang ◽  
Zigang Zheng ◽  
...  
Keyword(s):  
Porous Media ◽  
Phase Behavior ◽  
Molecular Simulation ◽  
Flow Model ◽  
Oil Reservoirs ◽  
Tight Oil ◽  
Flow Mechanism ◽  
Tight Oil Reservoirs ◽  
Microscopic Flow ◽  
Tight Porous Media

The successful development of tight oil reservoirs in the U.S. shows the bright future of unconventional reservoirs. Tight oil reservoirs will be the main target of exploration and development in the future, and CO2 huff-n-puff is one of the most important methods to enhance oil recovery factor of tight oil reservoirs in North America. To improve the performance of CO2 huff-n-puff, injection and production parameters need to be optimized through numerical simulation. The phase behavior and microscopic flow mechanism of CO2 huff-n-puff in porous media need to be further investigated. This paper presents a detailed review of phase behavior and microscopic flow mechanism in tight porous media by CO2 huff-n-puff. Phase behavior in tight porous media is different from that in a PVT cylinder since the capillary pressure in tight porous media reduces the bubble point pressure and increases the miscibility pressure and critical temperature. The condensate pressure in tight porous media and nonequilibrium phase behavior need to be further investigated. The microscopic flow mechanism during CO2 huff-n-puff in tight porous media is complicated, and the impact of molecular diffusion, gas-liquid interaction, and fluid-rock interaction on multiphase flow is significant especially in tight porous media. Nuclear magnetic resonance (NMR) and molecular simulation are efficient methods to describe the microscopic flow in tight oil reservoirs, while the NMR is not cost-effective and molecular simulation needs to be improved to better characterize and model the feature of porous media. The improved molecular simulation is still a feasible method to understand the microscopic flow mechanism of CO2 huff-n-puff in tight oil reservoirs in the near future. The microscopic flow model in micropore network based on digital core is worth to be established, and phase behavior needs to be further incorporated into the microscopic flow model of CO2 huff-n-puff in tight porous media.

Understanding of the Fluid Flow Mechanism in Porous Media of EOR by ASP Flooding from Physical Modeling

2007 ◽  
Author(s):  
Jialu Wang ◽  
Shiyi Yuan ◽  
Pingping Shen ◽  
Taixian Zhong ◽  
Xu Jia
Keyword(s):  
Porous Media ◽  
Fluid Flow ◽  
Physical Modeling ◽  
Flow Mechanism ◽  
Asp Flooding

scholarly journals Prediction of the low-velocity distribution from the pore structure in simple porous media

2017 ◽  
Vol 2 (12) ◽  
Author(s):  
Pietro de Anna ◽  
Bryan Quaife ◽  
George Biros ◽  
Ruben Juanes
Keyword(s):  
Porous Media ◽  
Velocity Distribution ◽  
Pore Structure ◽  
Low Velocity

Multiscale pore structure characterization of an ultra-deep carbonate gas reservoir

2021 ◽  
pp. 109751
Author(s):  
Yuxiang Zhang ◽  
Shenglai Yang ◽  
Zheng Zhang ◽  
Qian Li ◽  
Hui Deng ◽  
...  
Keyword(s):  
Pore Structure ◽  
Structure Characterization ◽  
Gas Reservoir

scholarly journals An Experimental Measurement of the Permeability of Deformable Porous Media

1986 ◽  
Vol 85 ◽  
Author(s):  
A. Ambari ◽  
B. Gauthier-Manuel ◽  
E. Guyon
Keyword(s):  
Porous Media ◽  
Pore Structure ◽  
Experimental Measurement ◽  
Sol Gel ◽  
Main Difficulty ◽  
Present Measurement ◽  
Deformable Porous Media ◽  
Sol Gel Transition ◽  
Differential Permeability ◽  
Gel Transition

ABSTRACTKnowledge of the evolution of the permeability of cement throughout the course of hydration provides a suitable means to evaluate the evolution of the pore structure. The main difficulty is to measure permeability without disturbing the tenuous structure of the material at the beginning of the hydration. We have developed a differential permeability technique in which the applied flow is sufficiently weak that the structure of the medium is not disturbed. As an example of application of this technique we present measurement of the evolution of the critical permeability during a sol-gel transition.

Pore structure characterization of cement pastes blended with high-volume fly-ash

2012 ◽  
Vol 42 (1) ◽  
pp. 194-204 ◽  
Author(s):  
Qiang Zeng ◽  
Kefei Li ◽  
Teddy Fen-chong ◽  
Patrick Dangla
Keyword(s):  
Fly Ash ◽  
Pore Structure ◽  
High Volume ◽  
Structure Characterization ◽  
Cement Pastes ◽  
High Volume Fly Ash
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