ph-responsive oil displacement agent composition, oil displacement agent, preparation method and application thereof
A technology of oil displacement agent and conditioner, which is applied in the field of pH responsive oil displacement agent composition, can solve problems such as difficulty in demulsification, emulsifier cannot be reused, etc., achieves enhanced oil recovery, good oil displacement effect, and increased crude oil The effect of recovery factor
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Embodiment 1
[0041] This embodiment provides a series of pH-responsive oil displacement agents and preparation methods thereof, which specifically include the following steps:
[0042] Take a certain amount of APG1214, SDS, and BS12 and dissolve them in water respectively, stir them with a magnetic stirrer until they are completely dissolved, add chitosan respectively until they are stirred and dissolved, and compound chitosan with three surfactants according to different mass ratios , the compounding mass ratio is 8:2, 6:4, 5:5, 4:6, 2:8, and the pH value of the solution system is adjusted in the range of 1.51 to 6.58 by hydrochloric acid or sodium hydroxide, for example: the pH value is 1.51, 4.40, 5.93, 6.33, 6.58, and the total mass of the chitosan and the surfactant accounts for the mass concentration of the total oil displacing agent is always 0.1wt%.
[0043] The interfacial tension was measured for a series of oil displacement agents prepared in this example. Using TX-500C (Bowing...
Embodiment 2
[0047] This example discusses the effect of the concentration change of chitosan on the stability and permeability of the oil-displacing agent in the oil-displacing agent without adding surfactant only chitosan. The experimental results are shown in Table 1 below:
[0048] Table 1:
[0049]
[0050] It can be seen from the experimental data in Table 1 that as the concentration of chitosan increases, the stability of the system becomes worse. Under acidic conditions, the amino groups (NH 2 ) can be protonated into NH 3 + , so that there is a strong intermolecular electrostatic repulsion, and the molecules are not easy to aggregate. With the increase of pH, NH 3 + Start deprotonation and convert to amino (NH 2 ), the electrostatic repulsion between molecules is weakened, and the aggregation of molecules continues to occur.
[0051] The study found that with the increasing concentration, its emulsifying ability first increased and then decreased. This is due to the re...
Embodiment 3
[0053] This example discusses the influence of different compounding ratios of chitosan and different surfactants in the oil-displacing agent on the stability and permeability of the oil-displacing agent. During this process, the pH value of the oil-displacing agent was not adjusted. Experimental results such as image 3 shown.
[0054] image 3 I among the different proportions of chitosan and APG1214 when just preparing (a) and after leaving standstill for two days (b) photogram; image 3 II among them is the photograms of chitosan and SDS different compounding ratios when just preparing (a) and after standing for two days (b); image 3 III in the figure is the photo graph of different compound ratios of chitosan and BS12 when it was just prepared (a) and after standing for two days (b).
[0055] Depend on image 3 It can be seen that: (1) With the increase of the ratio of APG1214, the interfacial tension of the compound system first increases and then decreases, and whe...
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