Temperature-resistant, salt-resistant and low-tension foam flooding agent and preparation method thereof

A foam flooding, temperature-resistant and salt-resistant technology, applied in chemical instruments and methods, earthwork drilling and production, wellbore/well components, etc., can solve the problems of different structure-activity relationships and mechanisms, lack of foam systems, foam stability and oil-water The problem of difficult interface activity, etc., to achieve the effect of high interface activity, strong interface activity, and excellent foam stability

Active Publication Date: 2011-04-20
SHANDONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] The enrichment behavior of surfactants at the gas / water and oil / water interfaces is determined by the molecular structure, but the structure-activity relationship and mechanism are different, and are affected by environmental factors, including gas phase composition, oil phase composition, temperature, salinity , additives and other factors, so it is a difficult problem to optimize foam stability and oil-water interface activity at the same time, and there is a lack of low-tension foam systems with good foam stability and high oil-water interface activity.

Method used

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  • Temperature-resistant, salt-resistant and low-tension foam flooding agent and preparation method thereof
  • Temperature-resistant, salt-resistant and low-tension foam flooding agent and preparation method thereof
  • Temperature-resistant, salt-resistant and low-tension foam flooding agent and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] A temperature-resistant salt-resistant low-tension foam oil displacement agent, the composition of raw materials by mass is as follows:

[0032] Coconut oleic acid diethanolamide 42 parts, sulfobetaine 28 parts, water 130 parts. Wherein, coconut oleic acid diethanolamide is prepared by the following method:

[0033] In a 1000L synthetic reaction kettle, add 366 kilograms of coconut oil, add 234 kilograms of diethanolamine while stirring in the above-mentioned synthetic reaction kettle, keep the temperature at 80°C, stir 15g of potassium hydroxide, heat up to 120°C for 5 hours, Get coconut oleic acid diethanolamide.

[0034] In parts by mass, take 42 parts of the above-mentioned coconut oleic acid diethanolamide, add 28 parts of sulfobetaine, add 50 parts of water, stir at 50°C until completely dissolved, then add 80 parts of water, and stir evenly to obtain a low-tension foam The oil displacing agent is labeled LIF-1.

Embodiment 2

[0036] A temperature-resistant salt-resistant low-tension foam oil displacement agent, the composition of raw materials by mass is as follows:

[0037] 49 parts of coconut oleic acid diethanolamide, 21 parts of alkyl alcohol polyoxyethylene ether sulfate, 150 parts of water. Wherein, coconut oleic acid diethanolamide is made according to embodiment 1, and alkyl alcohol polyoxyethylene ether sulfate is the product of Taiyuan Fakai Company, and the model is AE3S.

[0038] In parts by mass, take 49 parts of coconut oleic acid diethanolamide, add 21 parts of alkyl alcohol polyoxyethylene ether sulfate, add 50 parts of water, stir at 50°C until completely dissolved, then add 100 parts of water, stir evenly, That is, the low-tension foam oil displacement agent is obtained, and the label is LIF-2.

Embodiment 3

[0039] Example 3: Foam stability and plugging profile control test

[0040] The foam agent is prepared as an aqueous solution with a concentration of 0.3%, and the foam is generated by the air flow method. The temperature of the foam generator is controlled at 50°C. The foam decay curve is obtained by measuring the change of the foam volume with time, and the time when the foam volume decays to half of the initial volume is taken. is the half-life of the foam, marked as t 1 / 2 . Foam stability is directly proportional to half-life.

[0041] Use 80-200 mesh quartz sand to fill a 55cm simulated core tube with a core pore volume of 32% and a permeability of 1.5 Darcy. After being saturated with water, inject aqueous solution and N at speeds of 10ml / min and 160ml / min respectively. 2 , measure the pressure at the inlet and outlet of the core tube, and get the initial pressure difference ΔP 初始 =P 入口 -P 出口 , and then inject 0.3% foaming agent aqueous solution and N at the same ra...

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Abstract

The invention relates to a temperature-resistant, salt-resistant and low-tension foam flooding agent and a preparation method thereof. The temperature-resistant, salt-resistant and low-tension foam flooding agent is prepared by continuously stirring alkanolamide, bipolar surfactant and water at 40-60DEG C until the alkanolamide, the bipolar surfactant and the water are completely dissolved. The temperature-resistant, salt-resistant and low-tension foam flooding agent provided by the invention is suitable for tertiary recovery under the conditions that the temperature is 50-120DEG C and the mineralization is 0-100000ppm. Compared with other common foam agents in the prior art, the oil-water interfacial tension is reduced from 10<-2>mN.m<-1> to 10<-3>mN.m<-1>; and compared with common interfacial active agents in the prior art, the half foam life period at 50DEG C is increased from 15 minutes to more than 40minutes, and the recovery ratio of an indoor model is increased by more than 15%.

Description

technical field [0001] The invention belongs to the field of oil field chemistry and relates to a chemical oil displacement agent for tertiary oil recovery, in particular to a tertiary oil recovery system which can be used in the late stage of high water-cut development of conventional oil reservoirs and high-temperature and high-salt oil reservoirs for one-time and greatly enhanced recovery. Background of the invention [0002] At present, more than 30 of the world's largest oil fields have entered the late stage of exploitation, and the use of technical means to further increase the recovery rate, that is, tertiary oil recovery has been recognized as an inevitable technical measure. [0003] Existing studies have shown that capillary effect and reservoir heterogeneity are the main contradictions restricting the low recovery rate of crude oil in the process of primary and secondary oil recovery. The capillary effect makes it difficult for crude oil to be effectively driven ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K8/584E21B43/22
Inventor 李英孙焕泉李振泉李春秀
Owner SHANDONG UNIV
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