SU757690A1 - Composition for removing asphalt-resin and paraffin deposits in oil-field equipment system - Google Patents

Description

The invention relates to the oil industry and can be used for the removal of asphalt-resin and paraffin deposits in systems 5 for the extraction, transportation and storage of oil (for example, in the bottom zones of wells, on the surface of underground and surface field equipment, etc.).

Known compounds used to remove asphalt-resin and paraffin deposits, such as a composition containing dimers and trimers of isobutylenes £ 1]; a mixture of esters of polyalkylene glycols [2}; the removal of paraffin and gums with alcohols, ketones, kerosene, and others is also known; a composition containing a kerosene distillate extract and acetone [4}. £ 0

The main disadvantage of these compounds is that they only remove paraffin deposits and slightly dissolve resins and asphaltenes, so they are not effective at removing sediments containing, along with paraffin substances, a significant amount of tar and asphaltenes.

The most close to the proposed composition, including a kerosene fraction of 30

2

20-25 wt.% carbon tetrachloride [5].

However, this composition does not provide high removal efficiency of asphalt-resin substances (for example, the degree of dissolution of the latter is only 42-47 wt.%), As well as resinous paraffin deposits with a high content of asphalt-resin substances. The degree of dissolution of the known composition of resin-paraffin deposits, containing more than 20 wt.% Of asphalt-resinous substances, is only 60-70 wt.%.

The aim of the invention is to increase the dissolving ability of the composition.

This goal is achieved by the fact that the composition for the removal of asphalt-resin and paraffin deposits in the system of oil-field equipment, containing chloro-substituted hydrocarbon, contains a mixture of chlorine-substituted hydrocarbon

1,2,3-trichloropropane and 2,3-dichloropropene and additionally contains epichlorohydrin, 2,3-dichloropropanol

3

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and 1,3-dichloropropanol in the following ratio of components, wt.%:

2.3- Dichloropropene 2.3-5.1

Epichlorohydrin 3 / 0-5,8

2.3- Dichloropropanol, 3.2-6.3

1, 3-Dichloropropanol ^; 1.0-2.3

1.2.3- Trichloropropane to 100

This composition can be obtained

in the process of synthesis of epichlorohydrin as a waste product.

• The effectiveness of the proposed composition for the removal of asphalt-resin and paraffin deposits is determined experimentally using the procedure described below and compared under comparable conditions with the effectiveness of the known composition.

The research method is as follows. A sample of resinous asphaltene and paraffinic substances is placed on a metal grid, which is suspended on one of the arms of the balance arm of the laboratory balance, then

- the grid with the sample is immersed in the test solvent and the balance is balanced.

Solvent capacity of the solvent is assessed by weight change

, the sample in a solvent, which is fixed after a certain time.

As a solvent, use a mixture of the proposed composition, as well as the known composition. Temperature . experiments 25 ° C. Sediment dissolution

15 carried out on the compositions given in table. one.

Table 1 The composition of the investigated products

Experience Components The content in the mixture component, wt.% Composition BUT B AT one 1,2, Z-Trichloropropane 80.5 90.5 85.7 2 2, Z-Dichloropropene 5.1 2.3 3.5 3 Epichlorohydrin 5.8 _: 3.0 4.0 four 2, 3-Dichloropropanol 6.3 3.2 5.1 five 1, 3-Dichloropropanol 2.3 1.0 1.7

In tab. 2 shows the results of the resin-containing substances containing

by dissolving with this composition ac- ^ 75 wt.% of tar and 25 wt.% of asphaltenes.

table 2

Comparison of 'effectiveness of agents asphaltene dissolution with various compositions '25 ^ν C

Experience Composition Weight change, g Power dissolving weight.% 0.25 h | 0.5 h | 1h 0.25 h I 0.5 h | 1 h one BUT 0.674 • 1.286 1.712 33.7 64.3. 85.6 '2 B 0.680 1.292 1.720 34.0 64.6 86.0 3 AT 0.676 1,288 1,716 33.8 64.4 85,8 four Kerosene (80 wt.%) + four-chloride carbon (20 wt.%) 0,504 0.840 0.950 25.2 42.0 47.5 As can be seen from the table. 2, use 60 draws 64.3-64.6 wt.% in flow

The proposed composition allows to increase the degree of dissolution of asphalt-resin substances. So the degree of dissolution within half an hour using the proposed composition of the state; h the degree of dissolution increases

up to 85.6-86.0 wt.% (experiments 1-3).

The degree of dissolution of asphalt-resin substances using as a solvent the famous 65

five

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tava [.53, within 0.5 and 1 h, respectively, 42.0 and 47.5 wt.% (experiment 4).

Thus, experiments indicate an increase in the degree of dissolution of rhenium in asphalt-resin substances

the proposed composition of 1.5—

1.7 times.

In 'table. 3 shows the results of dissolution of various compositions of paraffin deposits containing 22.1 wt.% Of asphalt-resin substances (the rest is paraffins).

Table 3

Comparison of the effectiveness of dissolving paraffin deposits with different compositions at 25 ° С

Experience Composition Weight change, g The degree of dissolution, weight. % 4 h | 24 h | 32 h 4 h 1 ^{24 h} 1 32 h one BUT 0.750 1,724 2, 000 37.5 86.2 100 2 B 0.756 1,728 2, 000 37,8 86.4 100 3 AT 0.752 1,724 2, 000 37,6 86.2 100 four Kerosene (80 wt.%) + tetrachloride carbon (20 wt.%) 0.634 1,290 one, 404 31.7 64.2 72

As can be seen from the table. 3, the use of the proposed composition allows to increase the degree of dissolution of paraffin deposits. So the degree of dissolution within 24 hours using the proposed composition is 86.2-86.4 wt.%, And within 32 hours the deposits dissolve completely (experiment 1-3). 35

The degree of dissolution of paraffin deposits using as a solvent of known composition amounts to 24.5 and 32 hours, respectively, 64.5 and 70.2 wt.% (Experiment 4). Thus, experiments indicate an increase in the degree of dissolution of paraffin deposits with the proposed composition from 33 % to complete dissolution of sediment.

This composition is non-flammable and non-explosive liquid, which is especially important for industrial use.

Claims (2)

Claim The composition for removing asphalt-resin and paraffin deposits in the system of oil-field equipment containing chlorine-substituted hydrocarbon, characterized in that, in order to increase the dissolving ability of the composition, the composition contains a mixture of 1,2,3-trichloropropane and 2,3-dichlopropene and additionally Epichlorohydrin, 2,3-dichloropropanol and 1,3-dichloropropanol in the following ratio of components, wt.%: 2.3- Dichloropropene 2.3-5.1 Epichlorohydrin 3-5,8 2.3- Dichloropropanol, 3.2-6.3 1.3- Dichloropropanol 1-2.3 1.2.3- Trichloropropane to 100