SU1629305A1 - Composition for removing asphaltene-resin and paraffin deposits - Google Patents

Abstract

The invention relates to the oil industry and is intended to remove asphaltoresin and paraffin deposits of GASLO} in the systems of extraction, transport and storage of oil. The goal is to increase the efficiency of coagula for oils with a higher tar content. For this, the composition for removing paraffin contains a residual fraction of alkyl aromatic hydrocarbons with a boiling range of 150-330 ° C and an organic additive based on phenol. As the last composition contains the condensation product of alkylphenols with formaldehyde and ammonia. The ratio of the reagents in the composition of the following: the condensation product of alkylphenols with formaldehyde and ammonia 0.10-0.75; the residual fraction of C-f-C Q alkyl aromatic hydrocarbons with boil-off limits is the rest. Adding the condensation product of alkylphenols with formaldehyde and ammonia to the composition increases its dissolving ability. The composition for the removal of paraffin significantly increases the efficiency of treatment of injection and production wells, does not pollute the associated water and has anti-corrosion properties. 2 tabl (L

Description

The invention relates to the petroleum industry, namely the removal of asphaltene-resin and paraffin deposits (ARPD) in the systems of production, transport and storage of oil.

The aim of the invention is to increase the effectiveness of the composition for oils with a high resin content.

The goal is achieved by the fact that the composition for removing ASPO in oil production, transportation and storage systems, containing a residual fraction of alkyl aromatic hydrocarbons with a boiling point of 150 330 ° C and an organic additive, contains the condensation product of alkylphenols with formaldehyde and ammonia in the following ratio of components, wt.%:

Condensate product

alkyphenols

with formaldehyde

and ammonia0.10-0.75

Residual fraction

alkyl aromatic

hydrocarbons C7-C (0

out of range

nor 150-350 С Else

The residual fraction of alkyl aromatic hydrocarbons, with boiling points of 150-330 ° C, is a by-product (the bottom residue) of the Cg-SC aromatics production process by catalytic reforming of the petroleum gasoline fraction and is called Nefras A 150/330.

The condensation product of alkylphenols with formaldehyde and ammonia is obtained by reacting at 80–105 ° С alklnolnols with formaldehyde and ammonia at a mass ratio of alkylphenols: Formaldehyde: ammonia 2: 1: 1 to a refractive index of 1.5190-1.5220. The resulting product, amino-methylene derivatives of alkylphenols (Mannich bases) corresponds to the structure formula

ONON

L-SNGN MYASCH-L T t

RК

where R is alkyl radicals with the number

carbon atoms Cg-C, Example. 2400 kg of industrial alkylfsnol (mol. Mass 220, content of free phenol 0.24 May L, kinematic viscosity at 100 ° С 5.50 mm2 / s, refraction coefficient at 20 ° С 1, 5080), add 960 kg of formalin (aqueous formaldehyde solution), 960 kg of ammonia water (25% aqueous ammonia solution) and increase the temperature to 98 ° C by injecting water vapor into the mixer jacket. The process of condensation of alkyl-phenol with formalin and ammonia at this temperature is carried out until the refractive index of the product at 20 ° C is reached 1,5200. After reaching

50

50

five

0

s q

five

J 000 kg Nefras A 150/330 with a temperature of 40 ° C is added to the mixer and the contents of the mixer are cooled to 70 ° C, after which water (l 60 kg) is separated from the product by settling for 4 hours. The resulting diluted the condensation product of alkylphenols with formaldehyde and mannich base ammonia) in an amount of 3500 kg is characterized by the following indicators: kinematic viscosity at 100 ° C 44 nitrogen content 1.32 wt.%, refractive index at 20 ° C 1.5170, base content Mannich 70 wt.%

The resulting product is dissolved in 486.5 tons of Nefras A 150/330 solvent, and 490 tons of the composition are obtained with the content of the condensation product of alkylphenol with formalin and ammonia 0.5% May. The effectiveness of the proposed composition is determined experimentally by the rod method. For testing, three sediment samples with a high tar content and different contents of asphalteno and paraffinic components are used; characteristic of oils with a high content of resinous substances.

The composition of paraffin is given in table.1.

The experimental procedure is as follows. A sample of the deposit is applied to the steel rod by heating in an even layer. The sample mass of ARPD is 1 g, the diameter of the rod is 1 cm, the height of the applied layer is 5 cm. After cooling to room temperature, the core with the sample is lowered into a cylinder with 25 ml of the tested composition and the duration of complete dissolution of ARPD is determined.

The test results of the proposed and known compositions according to the described method are shown in Table 2,

The test results show (Table 2) that the addition of insignificant amounts of condensation products of alkyl phenols with formaldehyde and ammonia to Nefras A 150/330 significantly increases the dissolving capacity of the composition. A positive effect is observed at an additive concentration of 0.1-0.75% by weight. The best results are obtained within the concentration of the additive of 0.25-0.50 wt.%.

The proposed composition for the removal of ARPD significantly increases the efficiency of treatment of injection and production wells in oil fields with a higher resin content, has less volatility and toxicity, dissolves only in the oil phase, does not pollute the water, i.e. is environmentally friendly. The composition at the same time has anti-corrosion properties. The use of the residual fraction of alkyl aromatic hydrocarbons as the main component of the composition makes it possible to skillfully use the by-product of the process for the production of aromatic hydrocarbons by catalytic reforming and significantly reduce the cost of the composition.

Claims (1)

Claim 20 A composition for removing asphaltene-resin and paraffin deposits, with 0 five holding a residual fraction of alkyl aromatic hydrocarbons C7 - C 0 with a boiling point of 150/330 ° C and an organic phenol-based additive, which distinguishes c. By the fact that, with a view to increasing the effectiveness of the composition for oils with a higher tar content, the pH contains the condensation product of alkyl phenols with formaldehyde and ammonia in the following ratio of components, wt.%: Alkylphenol condensation product with formaldehyde and ammonia Residual fraction alkyl aromatic hydrocarbons within the range of 10-0,75 Table Mrs. 150-330 one Rest Concentrations, additives mao Z Table 2 Duration of dissolution, min, samples ASNO 1 T 2 (3