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Hexadecyl toluene sulfonate for flooding and preparation method thereof, surfactant and application thereof

A technology of cetyl toluene sulfonate and cetyl toluene sulfonic acid, which is applied in the direction of sulfonate preparation, chemical instruments and methods, drilling compositions, etc., can solve the problem of changing the range of interfacial tension of surfactants Narrow, affecting the displacement effect of ASP flooding, and the interfacial activity of surfactants become worse, so as to achieve the effect of good interfacial activity, low cost and strong interfacial activity

Active Publication Date: 2013-07-10
PETROCHINA CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, heavy alkylbenzene sulfonate surfactants are used in Daqing Oilfield, the alkyl carbon number is 12-24, and the effective permeability is 100μm -2 , oil layers with an effective thickness of more than 5m, the application research of ASP flooding technology has been carried out, and good oil displacement effects (enhanced recovery can reach more than 20%) and economic benefits have been achieved, but due to the heavy alkylbenzene sulfonate raw material composition The component distribution is wide, the composition is complex, and the proportion of components is difficult to control. The change of composition will lead to the narrowing of the interfacial tension range of the surfactant, the alkali span is reduced from 0.6wt% to 0.4wt%, and the interfacial activity of the surfactant becomes worse. Moreover, the stability of the composite system deteriorated (the interfacial tension stabilization time was reduced from 90 days to 60 days), which seriously affected the oil displacement effect of the ASP flooding.
Although other existing alkylbenzenesulfonate surfactants have good performance of reducing interfacial tension and high oil displacement efficiency, they have the disadvantages of many components and complicated production process, so it is necessary to seek Surfactant for oil displacement with single component and simple production process

Method used

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  • Hexadecyl toluene sulfonate for flooding and preparation method thereof, surfactant and application thereof
  • Hexadecyl toluene sulfonate for flooding and preparation method thereof, surfactant and application thereof
  • Hexadecyl toluene sulfonate for flooding and preparation method thereof, surfactant and application thereof

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Embodiment 1

[0050] Embodiment 1, cetyl toluene sulfonate (sodium) preparation and the production of industrial product thereof

[0051] The following takes the preparation of sodium cetylmethylbenzene sulfonate as an example to describe its obtaining process in detail. It will be appreciated that the preparation of cetyltoluene is not necessary and this starting material is also commercially available.

[0052] 1) Preparation of hexadecyltoluene: the carbon number is C 16 The linear olefins and toluene are used as raw materials to prepare hexadecyl toluene. The process is as follows: taking 3000L scale-up application test as an example, add 1300Kg toluene, 38Kg main catalyst (aluminum trichloride) and 4L secondary catalyst (polyphosphoric acid) to 5000L reaction Reactor, stir for 10 minutes, slowly heat up until white gas is generated in the system, stop heating, then add 640Kg hexadecene (α-olefin) into the reactor, turn on circulating water to cool when the temperature reaches 40°C, co...

Embodiment 2

[0072] Embodiment 2, preparation cetyl toluene sulfonate surfactant

[0073] In the oil flooding application process, the surfactant is required to have good fluidity, so in the industrial product (mixed solution) of sodium cetyl toluene sulfonate produced in Example 1, add a cosolvent to dilute it to obtain a product that can be used directly. Cetyl toluene sulfonate surfactant in oil flooding compound system. Co-solvents can be ethanol, propanol, isopropanol or isobutanol, and the amount added is 15-20wt% of the total amount of surfactants. There should be no upper limit on the amount of co-solvents technically, but considering the cost, it should not exceed 20% is the most economical.

[0074] The present invention finally obtains the surfactant-hexadecyl toluene sulfonate surfactant that can be used in the mine field, and its main composition is 50-55wt% cetyl toluene sulfonate synthesis product, 15-20wt% alcohol , unsulfonated oil (unreacted alkylbenzene) is about 3wt%, i...

Embodiment 3

[0075] Embodiment 3, the performance detection of hexadecyl toluene sulfonate surfactant

[0076] The hexadecyl toluene sulfonate surfactant prepared in embodiment 2 is mixed with two kinds (strong base NaOH, weak base NaOH) 2 CO 3 ) three-component chemical composite flooding system, and the interfacial tension between the composite flooding system and Daqing crude oil was measured. During the measurement, the crude oil is the wellhead degassed crude oil, and the water is the injection water; the experimental temperature is 45°C; the test instrument is a spinning drop tensiometer from the University of Texas, model 500.

[0077] System 1: strong base system, the measured interface activity see Figure 2A .

[0078] Surfactant: hexadecyl toluene sulfonate surfactant (take n-butanol as an example with 15% addition of n-butanol), injection concentration of 0.05wt%-0.3wt% in the ternary composite system;

[0079] Alkali: strong alkali sodium hydroxide, injected into the terna...

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Abstract

The invention discloses hexadecyl toluene sulfonate for flooding and a preparation method thereof, a surfactant and application thereof. The surfactant prepared from the hexadecyl toluene sulfonate or an industrial product thereof and alcohol has good interfacial activity, strong capacity of resisting dilution and low use concentration (0.05-0.3wt%), can enable the oil-water interfacial tension to be ultralow (order of magnitude of 10<-3>mN / m) in wider or narrower alkali concentration ranges (0.4-1.2wt%) and under the strong and weak alkali conditions and has good composite system stability and high flooding efficiency. The recovery ratio of core flooding experiments is enhanced by more than 20% than that of water flooding. The surfactant which is single in composition, definite in structure and excellent in properties and is stable is provided for popularization and application of tertiary oil recovery, not only can oil recovery be substantially enhanced but also the domestic formula of the surfactant is achieved and the cost of ASP (alkaline-surfactant-polymer) flooding is greatly reduced.

Description

technical field [0001] The present invention relates to heavy alkylbenzene sulfonate surfactants for oil flooding in oil fields, in particular to a hexadecyl toluene sulfonate with single composition, known structure, excellent performance and stability which is suitable for oil field chemical composite oil flooding Acid salt, surfactant and preparation method thereof. Background technique [0002] Petroleum is a non-renewable resource. With the rapid development of my country's economy, the demand for petroleum is increasing day by day. The exploitation of oil is related to the overall situation of the national economy, and plays a vital role in the sustainable development of our country's economy and energy security. [0003] The exploitation of oil is divided into three stages: at first, it relies on the natural energy of the stratum to extract, which is called primary oil recovery, and the general recovery rate is 5%-10%; after the natural energy is exhausted, it can be...

Claims

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Application Information

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IPC IPC(8): C07C309/31C07C303/32C09K8/584
Inventor 程杰成吴军政丁玉敬
Owner PETROCHINA CO LTD
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