Nonlinear porous flow equation based on pore throat radius sorting of porous media in low-permeability reservoirs

2019 ◽  
pp. 1-11
Author(s):  
Meihua Yang ◽  
Haiquan Zhong ◽  
Mengqi Hu ◽  
Yingchuan Li
Keyword(s):  
Porous Media ◽  
Flow Equation ◽  
Low Permeability ◽  
Pore Throat ◽  
Throat Radius ◽  
Porous Flow ◽  
Low Permeability Reservoirs

A Fuzzy Method to Classify Low Permeability Reservoirs

2012 ◽  
Vol 524-527 ◽  
pp. 1300-1305
Author(s):  
Cheng Gang Duan ◽  
Ji Cheng Zhang
Keyword(s):  
Cluster Analysis ◽  
Porous Media ◽  
Low Permeability ◽  
Analysis Method ◽  
Multivariate Statistical ◽  
Throat Radius ◽  
Fluid Saturation ◽  
Cluster Analysis Method ◽  
Low Permeability Reservoirs

Cluster analysis is a multivariate statistical method of the study of sample (or variables) classification, gradually classified by the analysis of the sample or the similarity between the variables. In this paper, taking the case of Daqing low permeability reservoir, according to the movable fluid saturation, the average throat radius and the starting pressure gradient, we used cluster analysis method to conduct the multi-parameter classification of low permeability porous media, and achieved good results. The results showed that: The method in low permeability porous media category is feasible and has strong rationality.

Characteristics of Pore-Throat Structure and Mass Transport in Ultra-Low Permeability Reservoir

2013 ◽  
Vol 562-565 ◽  
pp. 1455-1460
Author(s):  
Qian Hua Xiao ◽  
Zheng Ming Yang ◽  
Xue Wu Wang
Keyword(s):  
Mass Transport ◽  
Size Distribution ◽  
Low Permeability ◽  
Pore Throat ◽  
Porous Flow ◽  
Low Permeability Reservoir ◽  
Flow Capacity ◽  
Reservoir Permeability ◽  
Key Factor ◽  
Small Tube

Low permeability reservoir is one of the most important petroleum reserve types in China. Therefore, some basic scientific problems about low permeability reservoir such as pore-throat size distribution, principle of porous flow should be deeply studied. Pore-throat size distribution, based on 69 cores from Changqing and Daqing oilfield of China, has been measured by comprehensive using Constant-Rate Mercury Injection and Nuclear Magnetic Resonance. It has been found that the Nano-pore-throat takes more than 60 percent of the total pore-throat of the low permeability reservoir and it is the key factor affecting the flow capacity when the permeability is less than 0.5×10-3μm2. The nano-pore-throat takes less than 40 percent of the total pore-throat and micron-pore-throat takes more than 45 percent when the permeability is larger than 5×10-3μm2. And Micron-pore-throat is the key factor affecting the flow capacity of low permeability reservoir. But when the reservoir permeability is between 0.5×10-3μm2 and 5×10-3μm2, its flow capacity is determined by the sub-micron-pore-throat and the amount of micron-pore-throat. Additionally, the key forces in micro-, sub-micro- and nanoscale pore-throat has been got by analyzing. The electrokinetic coupling matrix of mass transport has been gotten by analyzing the characteristics of the mass transport in small tube at different Debye ratio and pore-throat size distribution of ultra-low permeability.

scholarly journals An overview on nonlinear porous flow in low permeability porous media

2013 ◽  
Vol 3 (2) ◽  
pp. 022001 ◽  
Author(s):  
Yanzhang Huang ◽  
Zhengming Yang ◽  
Ying He ◽  
Xuewu Wang
Keyword(s):  
Porous Media ◽  
Low Permeability ◽  
Porous Flow

Quantitative Evaluation of Micro Pore Throat Characteristics in Extra Low Permeability Sandstone Oil Reservoir of Yanchang Group in Ordos Basin Using Constant Rate Mercury Penetration Technique

2011 ◽  
Vol 361-363 ◽  
pp. 408-413
Author(s):  
Hui Gao ◽  
Wei Sun
Keyword(s):  
Pore Radius ◽  
Ordos Basin ◽  
Low Permeability ◽  
Oil Reservoir ◽  
Pore Throat ◽  
Throat Radius ◽  
Distribution Ranges ◽  
Constant Rate ◽  
Permeability Distribution ◽  
The Difference

Micro pore throat characteristics of extra low permeability sandstone oil reservoir of Yangchang group in Ordos basin are analyzed using constant rate mercury penetration technique. The results show that pore radius distributes similarly, in 100～200μm, peak values are about 140μm in extra low permeability sandstone oil reservoir. The lower the permeability is, the narrower the distribution ranges of throat are, content of smaller throats become high and variation is more sensitive to permeability, distribution ranges of pore throat radius ratio are wide and permeability has bigger influence on input mercury saturation of throat in extra low permeability sandstone oil reservoir. The difference of pore throat characteristics mainly depends on throat in extra low permeability sandstone oil reservoir. The impacts of pore and throat on total capillary curve are various to different permeability cores, Throat development should be paid more attention in middle or later stage of oil development to extra low permeability sandstone oil reservoir.

scholarly journals Advantageous Reservoir Characterization Technology in Extra Low Permeability Oil Reservoirs

2017 ◽  
Vol 2017 ◽  
pp. 1-9 ◽  
Author(s):  
Yutian Luo ◽  
Zhengming Yang ◽  
Lixin Meng ◽  
Shutie Li
Keyword(s):  
Pressure Gradient ◽  
Gas Injection ◽  
Class Ii ◽  
Low Permeability ◽  
Throat Radius ◽  
Volume Percentage ◽  
Thin Sections ◽  
Variation Range ◽  
Low Permeability Reservoirs ◽  
Class Iv

This paper took extra low permeability reservoirs in Dagang Liujianfang Oilfield as an example and analyzed different types of microscopic pore structures by SEM, casting thin sections fluorescence microscope, and so on. With adoption of rate-controlled mercury penetration, NMR, and some other advanced techniques, based on evaluation parameters, namely, throat radius, volume percentage of mobile fluid, start-up pressure gradient, and clay content, the classification and assessment method of extra low permeability reservoirs was improved and the parameter boundaries of the advantageous reservoirs were established. The physical properties of reservoirs with different depth are different. Clay mineral variation range is 7.0%, and throat radius variation range is 1.81 μm, and start pressure gradient range is 0.23 MPa/m, and movable fluid percentage change range is 17.4%. The class IV reservoirs account for 9.56%, class II reservoirs account for 12.16%, and class III reservoirs account for 78.29%. According to the comparison of different development methods, class II reservoir is most suitable for waterflooding development, and class IV reservoir is most suitable for gas injection development. Taking into account the gas injection in the upper section of the reservoir, the next section of water injection development will achieve the best results.

scholarly journals The Experimental Investigation of the Development Potential of Low-Permeability Reservoirs in the Daqing Oilfield

Geofluids ◽  
2020 ◽  
Vol 2020 ◽  
pp. 1-8
Author(s):  
Yazhou Zhou ◽  
Daiyin Yin
Keyword(s):  
Fluid Flow ◽  
Flow Characteristics ◽  
Fluid Distribution ◽  
Low Permeability ◽  
Throat Radius ◽  
Threshold Pressure Gradient ◽  
Development Potential ◽  
Fluid Flow Characteristics ◽  
Low Permeability Reservoirs ◽  
Nonlinear Fluid

It is very risky and difficult to develop low-permeability reservoirs, but reservoir development can be guided by the development potential of different low-permeability reservoirs. In this study, natural cores of the Daqing Oilfield were used as the research objects. The throat radius distributions of the different low-permeability cores were determined by the constant velocity mercury injection method, the movable fluid distribution characteristics were determined by nuclear magnetic resonance, and the nonlinear fluid flow characteristics were analyzed via fluid flow experimentation. From these data, the development potential for low-permeability reservoirs was determined. The results show that when the permeability is 1×10−3 μm2, the average throat radius is only approximately 0.9 μm and throats with radii less than 0.1 μm account for approximately 30% of the throats. The throats with an average radius less than 1 μm, especially throats with radii less than 0.1 μm, are the main factor restricting the fluid flow in these cores. The movable fluid is only approximately 20% of the fluid in a core, and the threshold pressure gradient reaches 0.15 MPa/m when the permeability is 1×10−3 μm2, indicating that it is more difficult to develop reservoirs with permeabilities less than 1×10−3 μm2.

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