RU1810334C - Method of producing petroleum-displacing reagent for flooding petroleum stratum - Google Patents

Abstract

The inventive product is an oil-displacing reagent for flooding oil reservoirs — sulfonation of the waste from the production of sulfanol-bottom residue of the rectification stage of alkylbenzene, chlorosulfonic acid for 0.2-0.4 hours at a weight ratio of waste and chlorosulfonic acid equal to 1: (0.32-0.4) at 10-20 ° C and neutralization of sulfomass with a 40% aqueous solution of sodium hydroxide at 20-40 ° C. The degree of sulfonation is 99.3%. 3 tab.

Description

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WITH

The invention relates to organic sulfonates, in particular to the production of a surfactant based on a mixture of sodium dialkyl tetralin and diphenylalkane sulfonates, which are used in waterflooding of oil reservoirs.

The purpose of the invention is to increase the oil-displacing ability of aqueous surfactant solutions.

The goal is achieved by the fact that according to the proposed method, sulfanol production waste is used as hydrocarbon feed - the bottom residue of the alkylbznzol rectification stage and sulfonation is carried out with chlorosulfonic acid with a mass ratio of waste and chlorosulfonic acid of 1.0: (0.32-0.40) followed by neutralization of sulfomass with a 40% aqueous solution of sodium hydroxide.

The essence of the proposed method is that the sulfonol production waste is the bottom residue of the alkylbenzene rectification stage, containing, wt%: dialkyl tetralines 40-50; diphenylalkanes 40-45; polydiphenylalkanes 5-10 and representing a brown liquid mol. m 350 ± 20, specific gravity 0.895-0.905 g / cm3, subjected to sulfonation with chlorosulfonic acid S02 (0 H) CI with a mass ratio of waste to chlorine00

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sulfonic acid 1.0: (0.32-0.40) at a temperature of 10-20 ° C with a gradual supply for 0.6-1.0 hours, and then the resulting sulfomass is neutralized with a 40% aqueous solution of sodium hydroxide at 20- 40 ° C for 0.2-0.4 hours

The gradual supply of chlorosulfonic acid over a specified time at a temperature of 10-20 ° C is associated with the exothermicity of the reaction. By reducing the time of feeding chlorosulfonic acid and increasing temperature, a reaction mass may be ejected.

The sulfonation of this waste with chlorosulfonic acid is due to the fact that the oleum in the conditions of the prototype method, it sulfonates only 24%.

To compare the proposed technical solution, Table 1 shows the results of sulfonation under the conditions of a prototype. ., ...

Significant differences of the proposed method are due to the nature and composition of the waste - bottom residue of the rectification stage of alkyl benzene sulfonated at a mass ratio of waste to chlorosulfonic acid of 1.0: {0.32-0.40).

The neutralization step is similar to the known method.

Example. In a three-necked flask at 20 ° C, 31 g of the bottom residue of the rectification stage of alkylbenzene composition, wt.%: Dialkyltetralins 45; diphenylalkenes 45; polyphenylalkanes 10 include a stirrer and 10 g of chlorosulfonic acid are fed gradually over 15 minutes. The mass ratio of the bottom residue of the rectification stage of alkylbenzene and 50 g (OH) C1 1.00: 0.32. The mixture was stirred for 30 minutes and then neutralized with 15.20 g of a 40% aqueous solution of sodium hydroxide at 30 ° C. The sulfo product obtained was 37.80 g HCI 3.00 g. Losses were 0.35 g. The degree of conversion of the sulfanol production waste to the sulfo product was 99.3%. The content of the main substance is 52.65 g (82.1%), water 17.3%.

Other examples are given in table 2. 8 examples 1-4 show the main process parameters, in examples B-6, the relative proportions of the reacting components are indicated for comparison. The method under the conditions of the prototype is also presented in Table 2.

As can be seen from the data in Table 2, a change in the ratio of reagents (VAT residue S02 (OH) C11: 0.26) leads to a decrease in the degree of sulfonation and a deterioration in the surface tension of water at

the introduction of 1 wt.% surfactant. By varying this ratio 1: 0.45, the degree of sulfonation does not change significantly, but the surface tension of water also deteriorates, in addition, the consumption of NaOH to neutralize the sulfoproduct is significantly increased.

The study of oil-displacing properties

The surfactant obtained was carried out using 0.2 and 0.5% aqueous solutions on bulk models of formations with a length of 40.6 cm and a permeability of 1.03 µm2. To compare the results, experiments on

oil displacement was carried out under similar conditions with prefabricated water from the Lokbatan field and solutions of sulfanol and neonol AFd-12 (hydroxyethylated isononylphenol containing

12 groups of ethylene oxide) on the same water. The oil was displaced at a temperature of 20 ° C and a pressure drop of 0.05 MPa, which ensured the actual speed of movement of the oil-water contact. The results of the tests are given in Table 3 (is the displacement coefficient, V is the relative consumption of the displacing agent).

As can be seen from the data in Table 3, the oil displacement coefficient and the relative flow rate of a 0.1% aqueous surfactant solution are at the level of their known analogues for their intended purpose (basic objects). However, these agents are expensive. The cost of the proposed surfactant is much lower. With an increase in the concentration of an aqueous surfactant solution from 0.1 to 0.2-0.5%, the oil displacement coefficient increases by 7-10%. Thus, in comparison with the prototype, the use of the proposed method for producing surfactants provides the following advantages: obtaining a surfactant with 99.3% yield (82% in the prototype), reducing the sulfonation time from 4-5 hours to 1-1.2, due to

using the bottom residue of the alkyl benzene rectification stage as a feedstock, providing an aqueous solution of a surfactant with an oil-displacing ability and using them to increase oil recovery.

Claims (1)

SUMMARY OF THE INVENTION A method for producing an oil-displacing reagent for flooding oil reservoirs by sulfonation of a sulfanol production waste followed by neutralization of sulfomass with a 40% aqueous sodium hydroxide solution, characterized in that, in order to increase the oil-displacing ability, vat is used as a waste of sulfanol production the remainder of the alkylbenzene rectification step, and sulfonation is carried out with chlorosulfonic acid for 0.6-1.0 hours at Table 1 Compared results of sulfonation of sulfenol production wastes The surface tension of water with the introduction of I Mic. Surfactant is reduced to nN / m (at 20 C) 29, in mass ratio of waste: chlorosulfonic acid 1: 0.32-0.40 at 10-20 ° C. Table 2 28.7 28.7 32.0 35.1 36.0 Table 3 Comparative results of oil-displacing ability of aqueous surfactant solutions