CO2 miscible flooding in low permeability sandstone reservoirs and its influence on crude oil properties

2017 ◽  
Vol 35 (21) ◽  
pp. 2024-2029 ◽  
Author(s):  
Bin Xu
Keyword(s):  
Crude Oil ◽  
Low Permeability ◽  
Miscible Flooding ◽  
Sandstone Reservoirs

scholarly journals Research on Minimum Miscible Pressure Between Crude Oil and Supercritical Carbon Dioxide System in Ultra-Low Permeability Reservoir by the Long-Slim-Tube Experiment Method

2021 ◽  
Vol 9 ◽  
Author(s):  
Guangjuan Fan ◽  
Yuejun Zhao ◽  
Xiaodan Zhang ◽  
Yilin Li ◽  
Hao Chen
Keyword(s):  
Carbon Dioxide ◽  
Crude Oil ◽  
Oil Recovery ◽  
Low Permeability ◽  
Recovery Ratio ◽  
Experiment Method ◽  
Miscible Flooding ◽  
Enhance Oil Recovery ◽  
Low Permeability Reservoirs ◽  
Experimental Pressure

Carbon dioxide (CO2) injection has become an important technology to enhance oil recovery in ultra-low permeability reservoirs. Compared with other CO2 flooding technologies, CO2 miscible flooding has a better development effect, and the minimum miscible pressure (MMP) is a key parameter to realize miscible flooding. Therefore, it is very important to accurately predict the MMP. The prediction methods of MMP generally include laboratory experiment method and theoretical calculation method. In this study, a long-slim-tube displacement experiment method was used to determine the MMP in the study area, and the experimental temperature and pressure were consistent with those under reservoir conditions. The research results show that the recovery ratio increased gradually with the increase of experimental pressure, but the increase amplitude gradually decreased. According to the relation curve between crude oil recovery ratio and experimental displacement pressure, when the experimental pressure was larger than 29.6 MPa, the recovery ratio did not increase significantly with the increase of displacement pressure, which indicates that the interfacial tension between crude oil and CO2 disappeared under this pressure and they reached a miscible state. It is speculated that the MMP between crude oil and CO2 system in the study area predicted by the long-slim-tube displacement experiment method was 29.6 MPa. The results of this study help to realize miscible flooding in ultra-low permeability reservoirs and thus enhance oil recovery.

scholarly journals Measuerment of CO2-crude oil minimum miscible pressure in YC Oilfield by core displacement method

2021 ◽  
Vol 2109 (1) ◽  
pp. 012006
Author(s):  
Li Liu ◽  
Jinxin Liu ◽  
Yanfu Pi ◽  
Xuan Guo ◽  
Zhipeng Dai ◽  
...  
Keyword(s):  
Crude Oil ◽  
Physical Simulation ◽  
Low Permeability ◽  
Displacement Method ◽  
Reservoir Water ◽  
Tube Test ◽  
Reservoir Conditions ◽  
Good Repeatability ◽  
Target Block ◽  
Core Displacement

Abstract Aiming at the defect of measuring the CO2-crude oil MMP(minimum miscible pressure) by the slim tube test, the core displacement method is established based on indoor physical simulation and homogeneous rectangular core in the low permeability block of YC oilfield. For comparison, the MMP is measured by the slim tube test in the same block. Experimental results show that the method has good repeatability and can simulate porous media and reservoir water content, which is more consistent with the actual reservoir conditions. The MMP in the target block of YC oilfield was 19.85MPa, which was 1.87MPa lower than that measured by traditional slim tube test.

scholarly journals Experimental Investigation on the Effects of CO2 Displacement Methods on Petrophysical Property Changes of Ultra-Low Permeability Sandstone Reservoirs Near Injection Wells

Energies ◽  
2019 ◽  
Vol 12 (2) ◽  
pp. 327 ◽  
Author(s):  
Qian Wang ◽  
Shenglai Yang ◽  
Haishui Han ◽  
Lu Wang ◽  
Kun Qian ◽  
...  
Keyword(s):  
Physical Properties ◽  
Pore Size ◽  
Mineral Dissolution ◽  
Co2 Injection ◽  
Low Permeability ◽  
Co2 Flooding ◽  
Formation Water ◽  
Injection Wells ◽  
Rock Interaction ◽  
Sandstone Reservoirs

The petrophysical properties of ultra-low permeability sandstone reservoirs near the injection wells change significantly after CO2 injection for enhanced oil recovery (EOR) and CO2 storage, and different CO2 displacement methods have different effects on these changes. In order to provide the basis for selecting a reasonable displacement method to reduce the damage to these high water cut reservoirs near the injection wells during CO2 injection, CO2-formation water alternate (CO2-WAG) flooding and CO2 flooding experiments were carried out on the fully saturated formation water cores of reservoirs with similar physical properties at in-situ reservoir conditions (78 °, 18 MPa), the similarities and differences of the changes in physical properties of the cores before and after flooding were compared and analyzed. The measurement results of the permeability, porosity, nuclear magnetic resonance (NMR) transversal relaxation time (T2) spectrum and scanning electron microscopy (SEM) of the cores show that the decrease of core permeability after CO2 flooding is smaller than that after CO2-WAG flooding, with almost unchanged porosity in both cores. The proportion of large pores decreases while the proportion of medium pores increases, the proportion of small pores remains almost unchanged, the distribution of pore size of the cores concentrates in the middle. The changes in range and amplitude of the pore size distribution in the core after CO2 flooding are less than those after CO2-WAG flooding. After flooding experiments, clay mineral, clastic fines and salt crystals adhere to some large pores or accumulate at throats, blocking the pores. The changes in core physical properties are the results of mineral dissolution and fines migration, and the differences in these changes under the two displacement methods are caused by the differences in three aspects: the degree of CO2-brine-rock interaction, the radius range of pores where fine migration occurs, the power of fine migration.

scholarly journals Research for reducing minimum miscible pressure of crude oil and carbon dioxide and miscible flooding experiment by injecting citric acid isopentyl ester

2020 ◽  
Vol 13 (12) ◽  
pp. 9207-9215
Author(s):  
Yuejun Zhao ◽  
Guangjuan Fan ◽  
Yilin Li ◽  
Xiaodan Zhang ◽  
Hao Chen ◽  
...  
Keyword(s):  
Carbon Dioxide ◽  
Citric Acid ◽  
Crude Oil ◽  
Miscible Flooding

Wettability Alteration in Low-Permeability Sandstone Reservoirs by “SiO2–Rhamnolipid” Nanofluid

2019 ◽  
Vol 33 (12) ◽  
pp. 12170-12181 ◽  
Author(s):  
Di Wang ◽  
Shanshan Sun ◽  
Kai Cui ◽  
Hailan Li ◽  
Yejing Gong ◽  
...  
Keyword(s):  
Wettability Alteration ◽  
Low Permeability ◽  
Sandstone Reservoirs

Oil Recovery in Low Permeability Sandstone Reservoirs Using Surfactant-Polymer Flooding

2015 ◽  
Author(s):  
C. Marliere ◽  
N. Wartenberg ◽  
M. Fleury ◽  
R. Tabary ◽  
C. Dalmazzone ◽  
...  
Keyword(s):  
Oil Recovery ◽  
Polymer Flooding ◽  
Low Permeability ◽  
Sandstone Reservoirs
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