Research on Characteristics of Combination Flooding System and Oil Displacement Efficiency

2011 ◽  
Vol 391-392 ◽  
pp. 1047-1050 ◽  
Author(s):  
Yan Chang Su ◽  
Wen Xiang Wu
Keyword(s):  
Binary System ◽  
Interfacial Tension ◽  
Physical Simulation ◽  
Displacement Efficiency ◽  
Weak Base ◽  
Simulation Experiments ◽  
Oil Displacement ◽  
Oil Displacement Efficiency ◽  
Heterogeneous Cores

By physical simulation experiments, the features of alkali-free binary flooding system (polymer and a new surfactant BS) were contrasted with weak base ternary flooding system and alkali ternary flooding system. The experiment results showed that interfacial tension of BS binary system is the lowest. In the absence of alkali, the viscosity and elasticity of binary system were higher than those of other two ternary flooding systems. By physical simulation experiments with artificial heterogeneous cores, the recovery of BS binary flooding system was 2 percent higher than that of weak base ternary flooding system, and 1.4 percent higher than that of alkali ternary flooding system.

Experiment Research of Flooding Efficiency on Alternative Injection of Low-Tension System and Foam System

2012 ◽  
Vol 524-527 ◽  
pp. 1389-1394
Author(s):  
Ke Liang Wang ◽  
Guang Pu Jiao ◽  
Han Feng ◽  
Tian Tian Fu
Keyword(s):  
Interfacial Tension ◽  
Vital Role ◽  
Polymer Flooding ◽  
Laboratory Research ◽  
Displacement Efficiency ◽  
Oil Displacement ◽  
Profile Control ◽  
Oil Displacement Efficiency ◽  
Swept Volume ◽  
Low Tension

To make binary low-tension system play a vital role in improving oil displacement efficiency and foam system expand swept volume, binary low-tension system alternates with binary foam system flooding laboratory research is carried out after the polymer flooding technology. The method of airflow is used to proceed with foaming performance experiments by nitrogen gas. Surfactant CYL which foaming performance is stronger has good compatibility with alkali-free surfactant. The evaluation of the interfacial tension experiments shows that surfactant HLX has a low interfacial tension; the HLX's ability of reducing interfacial tension is less affected by CYL. It is shown through experiment that displacement recovery of binary foam system is 7.84% and binary low-tension system is 5.87% after polymer flooding, as well as the injection pattern of (0.05PV binary foam system+0.05PV N2+0.1PV binary low-tension system) alternating three times is best, which displacement recovery is 14.22% and 12.26% in natural core after polymer flooding. The injection pattern of profile control and oil displacement can attain a perfect effect after polymer flooding.

scholarly journals Study on oil displacement efficiency of offshore sandstone reservoir with big bottom water

2021 ◽  
Author(s):  
Jie Tan ◽  
Ying-xian Liu ◽  
Yan-lai Li ◽  
Chun-yan Liu ◽  
Song-ru Mou
Keyword(s):  
Bottom Water ◽  
High Water ◽  
Displacement Efficiency ◽  
Oil Displacement ◽  
Oil Displacement Efficiency ◽  
Sandstone Reservoir ◽  
Sandstone Reservoirs ◽  
High Water Cut Stage ◽  
High Water Cut ◽  
Water Cut

AbstractX oilfield is a typical sandstone reservoir with big bottom water in the Bohai Sea. The viscosity of crude oil ranges from 30 to 425 cp. Single sand development with the horizontal well is adopted. At present, the water content is as high as 96%. The water cut of the production well is stable for a long time in the high water cut period. The recoverable reserves calculated by conventional methods have gradually increased, and even the partial recovery has exceeded the predicted recovery rate. This study carried out an oil displacement efficiency experiment under big water drive multiple to accurately understand an extensive bottom water reservoir's production law in an ultra-high water cut stage. It comprehensively used the scanning electron microscope date, casting thin section, oil displacement experiment, and production performance to analyze the change law of physical properties and relative permeability curve from the aspects of reservoir clay minerals, median particle size, pore distribution, and pore throat characteristics. Therefore, the development law of horizontal production wells in sandstone reservoirs with big bottom water is understood. It evaluates the ultimate recovery of sandstone reservoirs with big bottom water. It provides a fundamental theoretical basis and guidance for dynamic prediction and delicate potential tapping of sandstone reservoirs with big bottom water at a high water cut stage.

Experimental Study on the Displacement Performance of Heat-Resistant Polymer

2014 ◽  
Vol 675-677 ◽  
pp. 1495-1499 ◽  
Author(s):  
Tao Ping Chen ◽  
Biao Qiu
Keyword(s):  
Polymer Flooding ◽  
Displacement Efficiency ◽  
Oil Viscosity ◽  
Permeability Ratio ◽  
Ratio Increase ◽  
Displacement Effect ◽  
Oil Displacement ◽  
Heat Resistant ◽  
Homogeneous Core ◽  
Oil Displacement Efficiency

The displacement performance of heat-resistant polymer is evaluated with the artificial cores and natural cores under 95°C. The best concentration of BH heat-resistant polymer is 1500 mg/L, and the best slug is 0.6 PV on the condition of the average permeability is 600×10-3μm2 of the homogeneous core and the oil viscosity is 2.3mPa • s. Under the best concentration and the PV size, BH heat-resistant polymer solution has better displacement effect for the artificial double core whose permeability ratio is less than 4. When permeability ratio exceed 4, the displacement affect no longer increase. When the mobility ratio increase from 0.05 to 0.2, for the artificial cores, the recovery of polymer flooding reduce by 3.17%, and for the natural cores, the recovery of polymer flooding reduce by 2.26%. The recovery of BH polymer that is aged for 90 days after vacuumed is 32.29%. Comparing with the fresh BH polymer, it is lower by 6.56%. That is to say that the aged BH polymer still has good oil displacement efficiency.

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