Abstract
Tuha oil field is located at the Turpan basin in China. Currently, the water content of the main reservoir of the section Y-6 of the Tuha oil field is more than 93% and the recovery rate is less than 20%. At present, an efficient oil displacing agent must be selected for this oil field, which can be used in reservoirs with a high degree of mineralization. Based on the results of experiments measuring the interfacial tension of the surfactant solution and oil, a non-ionic surfactant was selected. Non-ionic surfactant can reduce interfacial tension to the ultra-low level (10−3 mN/m), and when the amount of adsorption by oil sand is 3, interfacial tension also can maintain at the level of 10−2 mN/m, so the solution of non-ionic surfactant has good anti-adsorption ability. The results of the oil displacement experiments show that the solution of a non-ionic surfactant can increase the efficiency of oil displacement. But under condition of high water cut, the dominant flow channel in the core is formed, and the surfactant solution flows into the main channel preferentially and reduces the residual oil saturation in the main channel, which leads to a decrease in the resistance coefficient and injection pressure. Therefore, after water flooding, take measures to control the fluid profiles firstly so that the following surfactant solutions change direction in areas not exposed to water in order to achieve the best effect of the increase in oil recovery.
Highlights
Oil displacement agent refers to the chemical substances used to improve oil recovery, mainly refers to the functional compounds that can reduce residual oil saturation through chemical reaction, namely surfactants [1, 2]
The interfacial tension between the oil displacement agent and crude oil in different solution was measured by interfacial tensiometer
After water flooding, profile control measures should be taken first to make the following surfactant solutions divert into areas not affected by water, so as to achieve better oil recovery increase effect
Summary
Oil displacement agent refers to the chemical substances used to improve oil recovery, mainly refers to the functional compounds that can reduce residual oil saturation through chemical reaction, namely surfactants [1, 2]. The surfactant molecule has two functional groups, the hydrophilic (water soluble) and hydrophobic (oil soluble) group [3, 4]. Depending on the characteristics of the hydrophilic group, the surfactants are divided into four (anionic, cationic, zwitterionic and non-ionic) groups. The water content of the main reservoir of the section Y-6 of the Tuha oil field is more than 93% and the recovery rate is less than 20%, so it is essential to use the enhance oil recovery technology to increase the oil recovery rate. An efficient oil displacing agent must be selected for this oil field, which can be used in reservoirs with a high degree of mineralization. In this paper, based on the geological characteristics and fluid properties of the oil reservoir of the Y-6 section of the Tuha oil field, the suitable surfactant. Solution was selected, the interfacial tension of the solution with oil was measured, the adsorption characteristics and the oil displacement ability of the surfactant solution were evaluated
Sign-in/Register to view highlights & summary Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callMore From: IOP Conference Series: Materials Science and Engineering
Disclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
