Abstract
In the process of steam huff and puff to develop heavy oil reservoirs, steam channeling is the main factor that restricts the development effect, which causes that the swept area of steam is limited and unable to heat heavy oil adequately. It is important to find an economical and efficient method to prevent steam channeling from happening at steam huff and puff production; thus, a DF-2 high temperature tolerance foam system is proposed to assist steam huff and puff production in this paper. Firstly, utilizing high-temperature aging tank and high-speed stirrer device, the foam quality of DF-2 foam and four kinds of other common industrial foams were evaluated and compared; this experiment result shows that the DF-2 foam has the best temperature tolerance. Whereafter, three groups of single-sandpack experiments were carried out to investigate the change of DF-2 foam resistance factor under different conditions, which included the influence of gas liquid ratio, injection pattern, and crude oil, and the blocking capabilities of DF-2 foam were studied. Through the dual-sandpack experiment, the profile control performance and diversion capacity of the DF-2 foaming agents were studied and evaluated systematically. Finally, the DF-2 high temperature tolerance foam agent was applied to on-site production. The sandpack experiment results indicated that the resistance factor of DF-2 foam agent decreased with gas-liquid ratio, and the optimal gas-liquid ratio was 1 : 1. Coinjection of gas and liquid with foam generator is better than slug injection. Crude oil in sandpack can reduce blocking capability to some extent. During the application of the DF-2 high temperature tolerance foaming agent in the steam huff-n-puff process in M-12 Oilfield block, it had a good performance of profile control and foam blocking, solving the problem of steam channeling and improving the steam sweep area to increase the steam-oil ratio in the heavy oil reservoir, and the production performance of steam huff and puff was improved to a great extent.
Highlights
Heavy oil reservoir will play an important role in the future oil and gas resource development, which accounts for than 80% of annual heavy oil production in the world [1–4]
The foam flooding is a profile control method which is widely used in the process of heavy oil thermal recovery, which has become a common measure to improve steam injection performance
In order to fully utilize the foam properties of the foaming agent to increase the steam swept area and enhance the ultimate oil recovery factor, this paper proposed the DF-2 high temperature tolerance foam system to assist steam huff and puff production
Summary
Heavy oil reservoir will play an important role in the future oil and gas resource development, which accounts for than 80% of annual heavy oil production in the world [1–4]. Thermal recovery by steam injection is one of the most important development technologies for heavy oil [5–7]. The foam flooding is a profile control method which is widely used in the process of heavy oil thermal recovery, which has become a common measure to improve steam injection performance. Steam injection profile can be improved by foam [10–16] At the same time, foaming agent, as a surfactant, can effectively reduce
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 callDisclaimer: 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.
