Study of Porous Flow Mechanism for Low-Permeability Sandstone by the Use of NMR

2018 ◽  
pp. 55-73
Author(s):  
Yangfan Li ◽  
Hua Cai ◽  
Zhixing Yang
Keyword(s):  
Low Permeability ◽  
Flow Mechanism ◽  
Porous Flow

Study on Flow Mechanism of Gas Injection in Porous Carbonate Core

2014 ◽  
Vol 941-944 ◽  
pp. 1453-1458 ◽  
Author(s):  
Hui Liu ◽  
Peng Qu ◽  
Yang Liu
Keyword(s):  
Gas Injection ◽  
Formation Condition ◽  
Low Permeability ◽  
Flow Mechanism ◽  
Associated Gas ◽  
Study Results ◽  
The World ◽  
Gas Flooding ◽  
Hydrocarbon Gas ◽  
Wide Scale

There are wide scale of porous carbonate reservoirs in around the world, that have low permeability with undeveloped fracture. With study target of Savark formation in Middle East, core gas flooding experiments are conducted and microscope seepage mechanism is researched further. The study results indicate, with formation condition, miscible associated gas flooding is not achieved easily because of high minimum miscible pressure; flooding efficiency of hydrocarbon gas injection is high, especially for miscible flooding, because gas flooding makes oil volume expanse and viscosity decrease, and then oil mobility will be improved. In the experiments, gas injection mainly displace mobile oil in macropore, so changing displacement manner should be considered to improve flooding efficiency further.

Experimental Study on the Flow Field Distribution Law of Ultra-Low Permeability Reservoir with Inverted Nine-Spot Equilateral well Pattern

2014 ◽  
Vol 472 ◽  
pp. 1112-1116
Author(s):  
Zuo Cai Liao ◽  
Zheng Ming Yang ◽  
Qian Hua Xiao
Keyword(s):  
Experimental Study ◽  
Fluid Flow ◽  
Flow Field ◽  
Oil Reservoirs ◽  
Low Permeability ◽  
Distribution Law ◽  
Porous Flow ◽  
Low Permeability Reservoir ◽  
Well Pattern ◽  
Production Wells

Aimed at ultra-low permeability reservoir, the large natural outcrop model has been made for researching the oil reservoirs porous flow law deeply, and the inverted nine-spot equilateral well pattern also has been designed which is the commonest well patter during the oilfield exploitation. The flow fields have been measured during the experiment in different displacing period (0.3PV, 0.6PV and 1PV). The research shows that fluid flow has obvious directivity, and it strongly affected by heterogeneity of the reservoir. In addition, the regions between the edge production wells are much more difficult to be exploited.

scholarly journals Progress on Flow Mechanism in Low Permeability Formation

2015 ◽  
Vol 126 ◽  
pp. 466-470 ◽  
Author(s):  
Hu Guo ◽  
Fuyong Wang ◽  
Yiqiang Li ◽  
Zhaoyan Yu ◽  
Xian Gao ◽  
...  
Keyword(s):  
Low Permeability ◽  
Flow Mechanism

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

Impact of dynamic slippage on productivity of shale reservoirs

2015 ◽  
Vol 12 (5) ◽  
pp. 443-451 ◽  
Author(s):  
Samarth D. Patwardhan ◽  
Niranjan Bhore ◽  
Anirban Banerjee ◽  
G. Suresh Kumar
Keyword(s):  
Gas Flow ◽  
Gas Permeability ◽  
Descriptive Analysis ◽  
Low Permeability ◽  
Flow Mechanism ◽  
Computational Environment ◽  
Reservoir Models ◽  
Permeability Changes ◽  
Flow Mechanisms ◽  
Shale Reservoirs

Ultra low permeability rocks such as shales exhibit complex fracture networks which must be discretely characterized in our reservoir models to evaluate stimulation designs and completion strategies properly. The pressure (Darcy’s law) and composition driven (Fick’s law) flow mechanisms when combined result in composition, pressure and saturationdependent slippage factor. The approach used in this study is to utilize pressure-dependent transmissibility multipliers to incorporate apparent gas-permeability changes resulting from multi-mechanism flows in commercial simulators. This work further expounds on the effectiveness of the theory by presenting a descriptive analysis between two commercially utilized numerical simulators. The applicability of dynamic slippage as an effective flow mechanism governing gas flow mechanisms within the computational environment of two different simulators is attempted in this analysis. Results indicate that slippage-governed flow in modelling shale reservoirs should not be ignored.

Research and Application of Similarity Criterion in Advance Water Flooding in Low Permeability Reservoir

2013 ◽  
Vol 779-780 ◽  
pp. 1281-1284 ◽  
Author(s):  
Jin Gang He
Keyword(s):  
Physical Simulation ◽  
Similarity Theory ◽  
Similarity Criterion ◽  
Water Phase ◽  
Water Flooding ◽  
Model Parameters ◽  
Low Permeability ◽  
Porous Flow ◽  
Irreducible Water Saturation ◽  
Oil Water

This paper study on the oil/water phase porous flow process of advance water injection in low permeability reservoirs through the similarity theory. Get oil/water phase porous flow control equation of dimensionless equation through equation analysis method. Solve the dimensionless governing equations with the method of implicit and explicit solution of saturation method (IMPES). Results show that the bigger similarity criterion of sensitive factors, the bigger influence on test results; In the sensitive factors, which π10, π3, π8, π5 as the main similarity criterion. Considering above similar criterion to determine the reasonable indoor experiment of model parameters, which can mobile oil saturation, irreducible water saturation, water phase permeability, relative position well, hole diameter and reservoir thickness affect indoor advanced water flooding experiment of low permeability oil reservoirs recovery degree of the key technical parameters. Key word: Similarity criterion; Low permeability; Physical simulation; Tablet models

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