Salt-Tolerant Surfactant for Dilute Surfactant Flooding in High-Salinity Reservoirs: Residual Oil Stripping and Displacement Mechanism and Efficiency by Ultra-Low Interfacial Tension

2020 ◽  
Author(s):  
Chengdong Yuan ◽  
Wanfen Pu ◽  
Mikhail A. Varfolomeev ◽  
Tao Tan ◽  
Anastasia A. Timofeeva ◽  
...  
Keyword(s):  
Interfacial Tension ◽  
High Salinity ◽  
Residual Oil ◽  
Surfactant Flooding ◽  
Salt Tolerant ◽  
Displacement Mechanism ◽  
Low Interfacial Tension ◽  
Dilute Surfactant Flooding

Ultra-Low Interfacial Tension and Retention of Internal Olefin Sulfonate (IOS) for EOR

2012 ◽  
Vol 550-553 ◽  
pp. 36-39 ◽  
Author(s):  
Li Mei Sun ◽  
Guo Qiang Gao ◽  
Lu Shan Wang ◽  
Zhong Qiang Tian ◽  
Jie Cui ◽  
...  
Keyword(s):  
Porous Media ◽  
Interfacial Tension ◽  
High Salinity ◽  
Carbon Number ◽  
Surfactant Flooding ◽  
Optimal Salinity ◽  
Low Interfacial Tension ◽  
Internal Olefin ◽  
C 50 ◽  
Internal Olefin Sulfonate

Surfactant ultra-low interfacial tension (IFT) for internal olefin sulfonate with iso-amylalcohol (IAA) as co-solvent against heptane, octane and decane at 20 °C, 50 °C, and 90 °C respectively have been systematically investigated, as well as the dynamic retention in porous media. The results show for oils with alkane carbon number from 7 to 10 and temperature from 20 °C to 90 °C, optimal salinity starts from 6.5 wt% to 11.6 wt% NaCl, where ultra-low IFT occurs. While at high salinity (at least from 6 wt% NaCl ), the retention is too high for surfactant flooding to be applicable. Only internal olefin sulfonate with co-solvent alone can not provide a perfect formulation with ultra-low IFT and low retention.

Tertiary Surfactant Flooding: Petroleum Sulfonate Composition-Efficacy Studies

1973 ◽  
Vol 13 (04) ◽  
pp. 191-199 ◽  
Author(s):  
Walter W. Gale ◽  
Erik I. Sandvik
Keyword(s):  
Interfacial Tension ◽  
Oil Recovery ◽  
Weight Distribution ◽  
Capillary Rise ◽  
Equivalent Weight ◽  
Residual Oil ◽  
Surfactant Flooding ◽  
Petroleum Sulfonate ◽  
Low Interfacial Tension ◽  
Oil Water

Abstract This paper discusses results of a laboratory program undertaken to define optimum petroleum program undertaken to define optimum petroleum sulfonates for use in surfactant flooding. Many refinery feedstocks, varying in molecular weight and aromatic content, were sulfonated using different processes, Resulting sulfonates were evaluated by measuring interracial tensions, adsorption-fractionation behavior, brine compatability, and oil recovery characteristics, as well as by estimating potential manufacturing costs. The best combination o[ these properties is achieved when highly aromatic feedstocks are sulfonated to yield surfactants having very broad equivalent weight distributions. Components of the high end of the equivalent weight distribution make an essential contribution to interfacial tension depression. This portion is also strongly adsorbed on mineral surfaces and has low water solubility. Middle Portions of the equivalent weight distribution serve as sacrificial adsorbates while lower equivalent weight components Junction as micellar solubilizers for heavy constituents. Results from linear laboratory oil-recovery tests demonstrate interactions of various portions of the equivalent weight distribution. portions of the equivalent weight distribution Introduction Four major criteria used in selecting a surfactant for a tertiary oil-recovery process are:low oil-water interfacial tension,low adsorption,compatibility with reservoir fluids andlow cost. Low interfacial tension reduces capillary forces trapping residual oil in porous media allowing the oil to be recovered. Attraction of surfactant to oil-water interfaces permits reduction of interfacial tension; however, attraction to rock-water interfaces can result in loss of surfactant to rock surfaces by adsorption. Surfactant losses can also arise from precipitation due to incompatibility with reservoir fluids. Low adsorption and low cost are primarily economic considerations, whereas low interfacial tension and compatibility are necessary for workability of the process itself. Petroleum sulfonates useful in surfactant flooding have been disclosed in several patents; however, virtually no detailed information is available in the nonpatent technical literature. Laboratory evaluation of surfactants consisted of determining their adsorption, interfacial tension, and oil recovery properties. Adsorption measurements were made by static equilibration of surfactant solutions with crushed rock and clays and by flowing surfactant solutions through various types of cores. Interfacial tensions were measured using pendant drop and capillary rise techniques. Berea, pendant drop and capillary rise techniques. Berea, Bartlesville, and in some cases, field cores containing brine and residual oil were flooded with sulfonate solutions in order to determine oil recovery. Fluids used in these displacement tests are described in Table 1. Unless otherwise specified, displacements of Borregos crude oil were carried out with Catahoula water as the resident aqueous phase after waterflooding and displacements of phase after waterflooding and displacements of Loudon crude oil with 1.5 percent NaCl as the resident aqueous phase. In those examples where banks of surfactants were injected, drive water following the surfactant had the same composition as the resident water. Concentrations of sulfonates are reported on a 100-percent activity basis. PETROLEUM SULFONATE CHEMISTRY PETROLEUM SULFONATE CHEMISTRY A substantial portion of the total research effort TABLE 1 - PROPERTIES OF FLUIDS USEDIN FLOODING TESTS

The Laboratory Research on Ultra-Low Interfacial Tension Foam Flooding System with High-Temperature and High-Salinity

2011 ◽  
Vol 71-78 ◽  
pp. 2163-2168 ◽  
Author(s):  
Xin Liang ◽  
Ming Hui Xiang ◽  
Yong Yang ◽  
Qi Hua Chen ◽  
Zeng Rong Shu
Keyword(s):  
High Temperature ◽  
Interfacial Tension ◽  
High Salinity ◽  
Divalent Cations ◽  
Laboratory Research ◽  
Foam Properties ◽  
Order Of Magnitude ◽  
Low Interfacial Tension ◽  
Foam Flooding ◽  
Mixture System

To obtain the ultra-low interfacial tension foam flooding system for the real reservoir condition of high-temperature and high-salinity, foam properties and dynamic interfacial tension had been performed by Ross-miles test and spin drop tension meter respectively. Ten types of surfactants were screened by foamability, stability and interfacial tension (IFT) at 85°C, high-salinity with 800 mg/L divalent cations and 30000 mg/L total mineralization. The AOS, AESO and 20YB were selected to compose further anion-nonionic mixture system. Due to AOS had excellent foam properties, AESO could achieve low interfacial tension and 20YB could improve the film quality. Through series complex study, the ultra-low interfacial tension (10-4 mN/m order of magnitude) foam system was obtained with the composition of 0.15% wt AOS+0.15% wt AESO+0.11%~0.012% wt 20YB for high-temperature and high-salinity, which V foam was 240-235 mL and t 0.5 was 180-190 min. In addition, the synergistic effect of these surfactants had been described.

Interfacial Tension Measurement of Light Oil from Thailand to Enhance Oil Recovery for Surfactant Flooding Application

2017 ◽  
Vol 890 ◽  
pp. 235-238 ◽  
Author(s):  
Chitipat Chuaicham ◽  
Kreangkrai Maneeintr
Keyword(s):  
Interfacial Tension ◽  
Enhanced Oil Recovery ◽  
Oil Recovery ◽  
Surfactant Concentration ◽  
High Salinity ◽  
Surfactant Flooding ◽  
Sodium Dodecylbenzenesulfonate ◽  
The North ◽  
Light Oil ◽  
Enhance Oil Recovery

To enhance oil recovery, surfactant flooding is one of the techniques used to reduce the interfacial tension (IFT) between displacing and displaced phases in order to maximize productivity. Due to high salinity of crude oil in the North of Thailand, surfactant flooding is a suitable choice to perform enhanced oil recovery. The objective of this work is to measure the IFT and observe the effects of parameters such as pressure, temperature, concentration and salinity on IFT reduction. In this study, sodium dodecylbenzenesulfonate is used as surfactant to reduce IFT. The results show that the major factor affecting reduction of IFT is surfactant concentration accounting for 98.1%. IFT reduces with the increase of salinity up to 86.3% and up to 9.6% for temperature. However, pressure has less effect on IFT reduction. The results of this work can apply to increase oil production in the oilfield in the North of Thailand.

Interfacial Tension Required for Significant Displacement of Residual Oil

1979 ◽  
Vol 19 (02) ◽  
pp. 83-96 ◽  
Author(s):  
Soo Gun Oh ◽  
John C. Slattery
Keyword(s):  
Interfacial Tension ◽  
Crude Oil ◽  
Porous Structure ◽  
Surfactant Solution ◽  
Void Volume ◽  
Immiscible Displacement ◽  
Residual Oil ◽  
Production Wells ◽  
Low Interfacial Tension ◽  
Tertiary Recovery

Abstract A static analysis of displacement in a single irregular pore partially filled with oil is used to investigate the effects of interfacial tension and wettability on the tertiary recovery of residual oil by a low interfacial tension waterflood. There are several results. For the most efficient displacement of residual oil, either the porous structure should be water-wet or intermediate-wet. There is a critical value for the interfacial tension above which the residual oil cannot be displaced, but instead will assume a static configuration. Although the computation describes the static configuration of an oil globule in a pore, it suggests the underlying mechanism for the episodic motion or jump of a globule as it is displaces. The discussion of displacement in a single pore is extended by an estimate for the value of the capillary number, required for recovery of residual oil from those pores whose neck radii are larger than the mean pore neck radius. A comparison is offered with data taken from the literature. Introduction Petroleum is found in the microscopic pores of sedimentary rocks such as sandstones and limestones. Not all pores will be filled with petroleum. Some pores contain water or brine that petroleum. Some pores contain water or brine that is saturated with the minerals in the local rock structure. In the primary stage of production, oil and brine are driven into a well from the surrounding rock by the relatively large difference between the initial field pressure and the pressure in the well. Perhaps 10 to 20% of the oil originally in place is recovered in this manner. In the secondary stage of production, water or steam is pumped into a selected pattern of wells in a field, forcing a portion of the oil into other production wells. The void volume in a permeable production wells. The void volume in a permeable rock may be thought of as many intersecting pores of varying diameters. Consider two parallel pore spaces of unequal permeabilities. A blob of oil (residual oil) will be trapped in that pore space, through which the oil is displaced by the water more slowly. In this manner, 10 to 40% of the oil initially in place will be recovered, but 40 to 80% of the oil originally in place is left behind in the field. Several tertiary recovery techniques have been proposed. We focus our attention here on the proposed. We focus our attention here on the recovery of residual oil by a low interfacial tension waterflood. One can distinguish between at least two different types of such waterfloods. One type uses a small volume (3 to 20% PV) of a relatively concentrated surfactant solution. The concentration of the surfactant solution is high enough to ensure that it is miscible with the crude oil in all proportions. As a small slug of this surfactant solution moves through the porous structure mixing with and displacing the crude oil, surfactant is lost by adsorption on the rock. The solution is diluted further with the connate water present in the structure. As the concentration of present in the structure. As the concentration of surfactant falls, the water/crude oil/surfactant mixture can move from a single-phase region to a multiphase region on its phase diagram. We should expect that a miscible displacement conducted with a small slug of surfactant solution will revert to an immiscible displacement at some point in the reservoir. In the type of waterflood with which we are concerned here, a large volume (15 to 60% PV or more) of a dilute surfactant solution is used. The crude oil is nearly insoluble in the surfactant solution, and we speak of an immiscible displacement. It has been estimated that in carefully selected, well-designed, well-performing operations, an additional 30% of the oil originally in place might be recovered by a low interfacial tension waterflood. The crude oil/water interfacial tension can be reduced by orders of magnitude when either a mixture of surfactants or an alkaline solution is added to the waterflood. SPEJ P. 83

Effects of interfacial tension and emulsification on displacement efficiency in dilute surfactant flooding

RSC Advances ◽  
2016 ◽  
Vol 6 (56) ◽  
pp. 50640-50649 ◽  
Author(s):  
Wanfen Pu ◽  
Chengdong Yuan ◽  
Wenge Hu ◽  
Tao Tan ◽  
Jian Hui ◽  
...  
Keyword(s):  
Interfacial Tension ◽  
Surfactant Flooding ◽  
Displacement Efficiency ◽  
Dilute Surfactant Flooding

This study provides an investigation on the effect of interfacial tension (IFT) and emulsification on displacement efficiency in dilute surfactant flooding.

Experimental Study on Low Interfacial Tension Foam for Enhanced Oil Recovery in High-Temperature and High-Salinity Reservoirs

2017 ◽  
Vol 31 (12) ◽  
pp. 13416-13426 ◽  
Author(s):  
Jiaping Tao ◽  
Caili Dai ◽  
Wanli Kang ◽  
Guang Zhao ◽  
Yifei Liu ◽  
...  
Keyword(s):  
Experimental Study ◽  
High Temperature ◽  
Interfacial Tension ◽  
Enhanced Oil Recovery ◽  
Oil Recovery ◽  
High Salinity ◽  
Low Interfacial Tension
Sign in / Sign up

Export Citation Format

Share Document