RU2139317C1 - Crude oil dehydration and desalting composition "polynol d" - Google Patents

Abstract

FIELD: oil and gas production. SUBSTANCE: composition for demulsifying, dehydrating, and desalting water-oil emulsions contain organic solvent with 55-65 wt % of mixture of (i) oxyalkylenated ethylenediamine with number of propylene oxide units 60-61 and ethylene oxide units 27-28 and (ii) oxyalkylenated alkylphenol compound, in particular, oxyethylenated isononylphenol-formaldehyde resin with general formula:

Description

 The invention relates to the field of oil production and refining, and in particular to demulsifiers for the destruction of persistent oil-water emulsions, applicable both to emulsions based on Devonian oils, and on the basis of carbonaceous sulphurous and high-sulfur oils in the conditions of in-pipe demulsification, at oil treatment plants and oil refineries.

 There is a large assortment of foreign demulsifiers used in oil companies in our country (Doufax - USA, Dow Chemical K; Separol 25 - Germany, BASF; Dissolvan-4411 and Dissolvan-4490 - Germany, Hoechst) . Demulsifiers are block copolymers of ethylene and propylene oxides, possibly with various additives. The content of the active part in a marketable product is 50-80%, the rest is a solvent (water, alcohols, aromatic hydrocarbons).

 However, the above-mentioned demulsifiers are not always sufficiently effective in the destruction of water-oil emulsions formed on the basis of heavy high-sulfur oils at the temperature of their production.

 In addition to foreign demulsifiers, the domestic one is known - Diproxamine-157 [Ibragimov GZ, Fazlutdinov KS, Khisamutdinov NI The use of chemicals to intensify oil production. -M .; Nedra, 1991, 382 pp.], Which is also a block copolymer of alkylene oxides.

 The disadvantages of this reagent include its low activity when exposed to emulsions of high viscosity oils, high consumption rates and a long settling time.

The closest to the proposed composition is the following composition [A.S. 1773932, class C 10 G 33/04], containing, wt.%:
Diproxamine-157-65M - 50-65
Oxyethylated Nonylphenol - 20-30
Water - up to 100
The disadvantages of this composition are its low activity, unsuitability for the preparation of sulfur oils of coal-bearing horizons and the need for significant heating, high flow rates and a long settling time when demulsifying light oils.

 The objective of the invention is the development of a demulsifying composition, which is a universal tool for dehydration and desalting of oil-water emulsions formed on the basis of both light and heavy sour oils, while maintaining the purity of drainage water and expanding the arsenal of inexpensive domestic demulsifiers.

где 4m= 60-61, 4n=27-28, и оксиалкилированного алкилфенольного соединения. Причем в качестве оксиалкилированного алкилфенольного соединения используют оксиэтилированную изононилфенолформальдегидную смолу (ОНФФС) формулы:

где R - изононил, m - целое число от 2 до 9, k - целое число от 2 до 4
при мас. соотношении составляющих смеси 1 : 0,25 - 5,6 соответственно при следующем соотношении компонентов композиции, мас.%:
Указанная смесь - 55-65
Растворитель - до 100
Используемый в составе композиции растворитель может быть выбран из следующих углеводородов: метанол, изопропанол, толуол.The problem is solved by the development of a composition for dehydration and desalting of oil-water emulsions, including a mixture of oxyalkylated ethylenediamine of the formula:

where 4m = 60-61, 4n = 27-28, and an oxyalkylated alkyl phenol compound. Moreover, as an oxyalkylated alkyl phenol compound, an oxyethylated isononyl phenol formaldehyde resin (ONPF) of the formula is used:

where R is isononyl, m is an integer from 2 to 9, k is an integer from 2 to 4
at wt. the ratio of the components of the mixture 1: 0.25 to 5.6, respectively, with the following ratio of components of the composition, wt.%:
The specified mixture is 55-65
Solvent - up to 100
The solvent used in the composition of the composition may be selected from the following hydrocarbons: methanol, isopropanol, toluene.

These resins are obtained by a known method for the catalytic condensation of alkyl phenol with formaldehyde to form novolac or resol products [Petrov GS, Rutovsky BN, Losev I.P. Technology of synthetic resins and plastics. -M .: GHI, 1946-548.]. Condensation is carried out at 135-150 ^o C in an inert reaction medium (under nitrogen pressure). The products obtained during base catalysis are reacted with ethylene oxide (OE) in an autoclave with a stirrer at a temperature of 165-170 ^o C and a pressure of 1.5-2.0 atm for 70-105 minutes The molecular weight of the hydrophobic component was determined by the cryoscopic method, the quantitative content of polyethylene glycol units was determined by weight gain, as well as by the phenolic index method. The resulting products are viscous substances of golden brown color. Some characteristics of the obtained products are given in table. 1 (see the end of the description).

 The demulsifying composition is prepared by mixing the components for 10-20 minutes according to the recommended composition.

 The demulsifying activity of the proposed composition is determined on oil-water emulsions of the deposits of Tatarstan. Characteristics of oils and oil-water emulsions based on them are given in table. 2 (see the end of the description).

Example. The demulsifying composition is introduced into the emulsion in the form of 1% solutions. The test oil emulsion (only stable water-oil emulsions are taken for testing, after discharge of spontaneously separated formation water - in the case of natural emulsions) are placed in 100 ml mixing cylinders, and the corresponding demulsifier is dosed using a micropipette. After that, the emulsion is shaken on a laboratory shaker for 30 minutes with an amplitude of 6-7 cm and a number of double strokes of 120 per minute at room temperature. Then the emulsion is thermostated for 2 hours at specified temperatures, periodically measuring the amount of released water, recounting it as a percentage of the initial amount of water in the emulsion. With a high degree of dehydration of the oil emulsion, samples are taken for the residual water content in the separated oil. The tests are carried out at two temperature conditions: at 20 ^o C and at 50 ^o C. Samples of the compositions and test results are given in table. 3,4,5,6 (see the end of the description).

 The following demulsifiers are tested: ethoxylated isononylphenol formaldehyde resins with different molecular weights of hydrophilic and hydrophobic parts, Diproxamine-157, compositions of the above-mentioned resins with Diproxamine-157 (samples of compositions with the PN code are listed in Table 3), prototype (according to A. S. S. 1773932, class C 10 G 33/04), effective imported demulsifiers such as Dissolvan-4411 and Dissolvan-4490.

 As can be seen from the experimental data, the proposed compositions show a high demulsifying effect in the destruction of various oil emulsions without affecting the environment. The proposed compositions have a lower cost than the well-known domestic demulsifiers.

Claims (1)

Composition for dehydration and desalting of water-oil emulsions, comprising a mixture of oxyalkylated ethylenediamine (Diproxamine-157) of the formula

where 4m = 60-61;
4n = 27-28,
and an oxyalkylated alkyl phenol compound in a solvent, characterized in that an oxyethylated isononyl phenol formaldehyde resin of the formula is used as the oxyalkylated alkyl phenol compound

where R is isononyl;
m is an integer from 2 to 9;
k is an integer from 2 to 4,
when the mass ratio of the components of the mixture 1: 0.25-5.6, respectively, in an organic solvent and the ratio of components, wt.%:
The specified mixture is 55-65
Solvent - Up to 100

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