Phase behavior and interfacial tension evaluation of a newly designed surfactant on heavy oil displacement efficiency; effects of salinity, wettability, and capillary pressure

2015 ◽  
Vol 396 ◽  
pp. 20-27 ◽  
Author(s):  
A.A. Dehghan ◽  
M. Masihi ◽  
Sh. Ayatollahi
Keyword(s):  
Interfacial Tension ◽  
Phase Behavior ◽  
Capillary Pressure ◽  
Heavy Oil ◽  
Displacement Efficiency ◽  
Oil Displacement ◽  
Oil Displacement Efficiency ◽  
Efficiency Effects

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.

Laboratory Studies of High-Temperature-Compound Steam Drive on Heavy Oil

2012 ◽  
Vol 524-527 ◽  
pp. 1185-1189
Author(s):  
Hai Huang ◽  
Wei Shi Zheng ◽  
Bo Chen ◽  
Yi Fei Liu
Keyword(s):  
High Temperature ◽  
Heavy Oil ◽  
Formation Condition ◽  
Displacement Efficiency ◽  
Oil Displacement ◽  
Water Breakthrough ◽  
Steam Drive ◽  
Oil Flow ◽  
Oil Displacement Efficiency ◽  
Gas Drive

This paper presents experimental work on the research of the mechanism of oil displacement of steam drive and high-temperature-compound steam drive, which in order to improve the conventional steam drive technology and increase the recovery of heavy oil. Many experiments were done with the sand-packed model under the formation condition. The results show that: (a) the high-temperature-compound steam drive could extend the water breakthrough time, increase the permeability of oil phase, reduce the residual oil saturation; (b) reducing the viscosity by CO2 dissolution, maintaining the pressure, improving the oil flow ratio, dissolved gas drive，Improving oil displacement efficiency，all of above were the increase production mechanism of high- temperature-compound steam drive.

Mechanisms of Enhancing Recovery of the Superficial Heavy Oil Reservoir

2012 ◽  
Vol 550-553 ◽  
pp. 468-471
Author(s):  
Fu Sheng Zhang ◽  
Jian Ouyang ◽  
De Wei Wang ◽  
Xin Fang Feng ◽  
Li Qing Xu
Keyword(s):  
Oil Recovery ◽  
Heavy Oil ◽  
Water Flooding ◽  
Chemical Agent ◽  
Oil Reservoir ◽  
Displacement Efficiency ◽  
Oil Displacement ◽  
Oil Displacement Efficiency ◽  
Heavy Oil Reservoir ◽  
Enhance Oil Recovery

The core displacement experiments show that displacement system containing chemical agent can enhance oil recovery by over 20% comparing to water flooding. Mechanisms by which chemical agent enhance oil recovery of heavy oil reservoir water flooding are: (1) improving mobility ratio by significantly decreasing viscosity of heavy oil, volumetric sweep efficiency is improved; (2) increasing capillary number by significantly decreasing oil-water interfacial tension, oil displacement efficiency is increased; (3) changing wettability of the rock surface from oil-wet to water-wet by significantly reducing the contact angle between displacement liquid and sandstone surface, capillary force is changed from the resistance force to the motive force, the residual oil is expelled from the small pores and the wall of pores, oil displacement efficiency is significantly increased.

Improvements of Superheated Steam Stimulation in Secondary Development of Heavy Oil Reservoir

2012 ◽  
Vol 524-527 ◽  
pp. 1450-1455
Author(s):  
An Zhu Xu ◽  
Xiang Hong Wu ◽  
Zi Fei Fan ◽  
Lun Zhao ◽  
Cheng Gang Wang
Keyword(s):  
Heavy Oil ◽  
Superheated Steam ◽  
Oil Production ◽  
Saturated Steam ◽  
Oil Reservoir ◽  
Displacement Efficiency ◽  
Oil Displacement ◽  
Oil Displacement Efficiency ◽  
Heavy Oil Reservoir ◽  
Steam Stimulation

With superheated steam, there is no direct relationship between temperature and pressure, Therefore, at a particular pressure it is possible for superheated steam to exist at a wide range of temperatures higher than that of its saturated steam. The heat transfer coefficient is 1/150-1/250 as much as that of saturated steam during heat transferring, and it takes a relatively long time to cool, during which time the steam is releasing very little energy and transmitted long distances. The mechanisms of superheated steam stimulation are mainly pointed to the performance of crude oil viscosity reduced, flow environment improved, rock wettability changed, oil displacement efficiency improved. Physical simulation shows that oil displacement efficiency by superheated steam is 6-12% higher than that of saturated steam at the same temperature, and under the condition of carrying the same heat, superheated steam enlarged the heating radius by about 10m, oil steam ratio increased by 0.7. Superheated steam stimulation was put into Kazakstan’s heavy oil reservoir after two cycles of saturated steam stimulation. The average daily oil production was 2-4 times that of saturated steam stimulation, which improved heavy oil production effectively. The secondary heavy oil thermal recovery by superheated steam stimulation applied in marginal heavy oil reservoirs achieved satisfactory effect.

Efficient Displacement of Heavy Oil by Use of Three Hydrocarbon Phases

SPE Journal ◽  
2014 ◽  
Vol 19 (05) ◽  
pp. 956-973 ◽  
Author(s):  
R.. Okuno ◽  
Z.. Xu
Keyword(s):  
Phase Behavior ◽  
Oil Recovery ◽  
Heavy Oil ◽  
High Efficiency ◽  
Displacement Efficiency ◽  
The West ◽  
Optimum Pressure ◽  
Local Displacement ◽  
Oil Displacement ◽  
Three Phases

Summary Mixtures of oil with solvent gas can exhibit three-hydrocarbon-phase behavior at reservoir conditions, where the solvent-rich liquid (L2) phase coexists with the gaseous (V) and oleic (L1) phases. Three-hydrocarbon-phase behavior has been studied in the literature for carbon dioxide (CO2) floods and enriched-gas floods at relatively low temperatures. Prior research on heavy-oil displacement with enriched gas presented that displacement efficiency at a given throughput can be nonmonotonic with respect to gas enrichment. Slimtube experiments for such displacements showed that oil recovery increased first, then decreased, and increased again with increasing gas enrichment. An optimum displacement with a high efficiency of more than 90% was observed when three-hydrocarbon-phase flow was present. However, detailed mechanisms for such an optimum displacement with three phases have not been explained in the literature. In this research, we investigate mass transfer on multiphase transitions between two and three phases for three-hydrocarbon-phase displacements. Simple conditions are derived for the multiphase transitions that yield high local displacement efficiency by three hydrocarbon phases. The derivation is based on the generalized mass conservation for a multiphase transition in 1D gas injection. The conditions derived are applied to explain nonmonotonic oil recovery in quaternary displacements and the West Sak oil displacements. Oil recovery at a given throughput can be nonmonotonic with respect to pressure or gas enrichment. Such a nonmonotonic trend can occur when local oil displacement by three hydrocarbon phases becomes more efficient, but slower, with decreasing pressure or decreasing gas enrichment. An optimum pressure or enrichment can occur as a consequence of the balance between the local displacement efficiency and the propagation rate of three hydrocarbon phases. The West Sak oil displacement with enriched gas studied in this research yields a high displacement efficiency of more than 90% at 1.5 hydrocarbon pore volumes (PV) injected at 53% methane (C1) dilution.

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