SU903372A1 - Reagent for removing paraffin deposits - Google Patents

Description

(54) REAGENT TO REMOVE PARAFFIN DEPOSITS

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This invention relates to mining.

and both gas and can be used to increase the productivity of oil and gas wells and the flowline of field pipelines by removing deposited paraffin and asphalt-resinous substances from the wellbore zone from the walls of pipes and technological devices.

Reagents are known for removing paraffin and asphalt-resinous sediments based on chlorine and serosubstituted carbon disulfide compounds, carbon tetrachloride, chloroform, and other SPs.

However, the use of carbon disulfide. limited by its high flammability and toxicity. Most carbon-hydrogen solvents are flammable and explosive liquids. To speed up the process of dissolving solid deposits, many of them need to be preheated before injection.

or add special catalytic additives to the well.

The aim of the invention is to improve the fire and explosion safety and efficiency of the process of removing wax deposits and asphalt-resinous substances.

The goal is achieved by those. that as a reagent for removing deposits of paraffin and asphalt-sm10 sheet materials, bottom residues of vinyl chloride production with a boiling point of 55-80 ° C are used

Vat residues are formed during the production of vinyl chloride by the method of thermal pyrolysis of 1,2-dichloroethane. They are easily mobile liquids that are non-flammable and non-explosive. Under standard conditions: vat density

20 residues equal to 1.2-1.5 g / cm, viscosity 0.45-0.54 cSt, surface tension at the air interface (34-39)

.

Distillation residues are a complex mixture of the following composition, about, 7,: Chloroform 1-40

1,2-Dichloroethane 1-45 1,1-Dichloroethane 5-85 Ethylene chlorohydrin 0.4-5.6 Benzene2-5

Vinyl chloride 0.1-3 1,1,2-Trichlorethylene 1-2 Other chlorine production, 1-13,5.

Tetrachloride carbon.

The ratio of the individual components of the mixture varies in these specified

Varnish can be seen from the tables in the data tables, the bottoms of the production of vinyl chloride in their solution, depending on the parameters of the production of vinyl chloride.

Distillation residues currently have no practical application and are therefore incinerated.

In tab. I and 2 provide comparative data on the dissolving capacity of the bottoms of vinyl chloride production and known organic solvents. In the experiments, paraffin deposits containing 23.9% by weight of asphalt-rich compounds are used, superior to known solvents. This increases the removal efficiency of sediment and the rest paraffins. Table 1

paraffin and asphalt-resinous substances; and wastes from the chemical industry are disposed of. The use of bottoms to remove wax deposits significantly reduces fires and explosive hazards.

Claims (1)

1. Chemical methods to control paraffin deposits. Ser. Oilfield business. M., VNIIOING, 1977.