The composition for removing oil deposits

 

(57) Abstract:

The invention relates to the oil industry. The technical result is to accelerate the removal of the AU and the increase of the capacity of the solvent. The composition contains, wt%: hydrocarbon fraction 70-165°C, obtained from the gasoline fraction of the reforming process with the addition of 15.9 17.3 percent Dicyclopentadiene, or a specified fraction obtained by distillation of liquid pyrolysis products, which includes of 15.9 17.3 percent of a mixture of cyclopentadiene and Dicyclopentadiene 98,8-99,2, surfactant 0.3 to 0.5 and the polar electrolit of 0.5-0.7. table 4.

The invention relates to the oil industry, and in particular to compositions for removal of asphalt, resin and paraffin deposits (ARPD), and can be used to remove them in the bottomhole formation zone, oilfield equipment, tanks and oil pipelines.

To remove and prevent ASPO there are many compositions, consisting usually of three components: aliphatic and aromatic hydrocarbons and surfactants (ionic or nonionic, or mixtures thereof). A combination of aliphatic and aromatic hydrocarbons is achieved by Kehl ASPO method of compounding aliphatic hydrocarbons using hexane fraction (U.S. Pat. No. 2009155, MKI C 09 K 3/00, published. 15.03.94), straight-run gasoline (U.S. Pat. No. 2098433, MKI C 09 K 3/00, E 21 In 37/06, published. 10.12.97), gasoline unstable (U.S. Pat. No. 2129583, MKI C 09 K 3/00, E 21 In 37/06, published. 27.04.99), gasoline pyrolysis raw (U.S. Pat. No. 2005117, MKI C 09 K 3/00, published. 30.12.93), aromatic heavy oil solvent (U.S. Pat. No. 2009155, MKI 09 To 3/00, E 21 In 36/00, published. 15.03.94), ethylbenzol and butylbenzene fractions, light pyrolysis resin (U.S. Pat. No. 2098433, MKI C 09 K 3/00, E 21 In 37/06, published. 10.12.97).

Along with aliphatic and aromatic hydrocarbons in some cases, the composition of paraffin removers enter and unsaturated hydrocarbons, such as piperylene and isoprene (U.S. Pat. No. 2149982, MKI E 21 In 37/06, From 09 To 3/00, published. 27.05.00), distillation residues of the distillation of styrene (U.S. Pat. No. 2175376, IPC 09 To 3/00, published. 27.10.01).

Due to the fact that ASPO even one field has a composition substantially different from each other, none of the proposed methods is not universal with respect to the deposits of a number of fields.

The closest to the essential features of the present invention is a composition according to patent No. 2129583 (IPC 09 To 3/00, E 21 In 37/06, published. 27.03.99) containing aliphatic and aromatic hydrocarbons, polar electrolit, surfactant-demola is SS="ptx2">

aromatic hydrocarbons 20-60

polar electrolit 0,5-4

surfactant-demulsifier of 0.01-1

the pH regulator else

The disadvantage is the low efficiency of removal of asphalt, resin and paraffin deposits from wells deposits, characterized by a high content of high molecular weight paraffins, resins and asphaltenes. Also known composition is characterized by a low capacity to dissolve the paraffin.

Based on the foregoing, there is a problem of creation on the basis of available raw materials effective remover for deposits with a high content of high molecular weight paraffins, resins and asphaltenes. The technical result is the acceleration of the process of removing the above ASPO while increasing the capacity of the solvent, i.e. the ability of the solvent dissolving and dispersing more by weight of the amount of sediment that reduces solvent consumption.

This technical result is achieved by the fact that in the known composition for removing oil deposits, including hydrocarbon fraction, surface-active substance and the tion 70-165°C, obtained from the gasoline fraction of the reforming process, adding to 15.9 17.3 percent Dicyclopentadiene, or a specified fraction obtained by distillation of liquid pyrolysis products, which includes of 15.9 17.3 percent of a mixture of cyclopentadiene and Dicyclopentadiene, in the following ratio, wt.%

Hydrocarbon fraction 70-165°C, obtained

of the gasoline fraction of the reforming process, with

adding to 15.9 17.3 percent Dicyclopentadiene

or a specified fraction obtained by distillation

liquid pyrolysis products, which includes

of 15.9 17.3 percent of a mixture of cyclopentadiene and

Dicyclopentadiene 98,9-99,2

Surfactant 0,3-0,5

Polar electrolit 0,5-0,7

Suitable as surface-active substance use substance selected from the group: OP 7, OP-10, sinterol AFM-12.

As a polar electrolyte may be used aliphatic alcohol selected from the group: methyl alcohol, isopropyl asleep, butyl alcohol, isobutyl alcohol.

The hydrocarbon fraction with a boiling point 70-165°C can be obtained in two ways:

a) by revealing the practical result it is necessary to add the Dicyclopentadiene in the 15.9-17.3 wt.%, which is issued by the industry on THE 2416-024-05766801-94;

b) the rectification of liquid pyrolysis products produced according to TU 38.400262-144-93, in this case, the composition of this fraction contains a mixture of unsaturated cyclic hydrocarbons - cyclopentadiene and Dicyclopentadiene in the 15.9-17.3 wt.%.

Noniongenetical surfactant OP-7 and OP-10 represent a butter-like liquid from light yellow to light brown in color and are produced according to GOST 8433-81. Noniongenetical saw neonols - ethoxylated ALKYLPHENOLS on the basis of trimers of propylene are a butter-like liquid light yellow in color and are available on THE 2483-077-05766801-98 seven brands (neonol AF 9-4, neonol AF 9-6, neonol AF 9-9, neonol AF 9-10, neonol FBA-10, neonol AF 9-12, neonol FBA -12).

Sinterol AFM - 12-sodium salt karboksimetilirovaniya polyoxyethylene isononylphenol represent pasta from white to light yellow or gray color produced by THE 38.602-22-44-93.

Polar electrolit presents aliphatic alcohols: methyl (GOST 6995-77), isopropyl (GOST 9805-84), n-butyl (GOST 5208-81), isobutyl (GOST 9536-79).

Achieve the specified technical result is explained by the following.

Paticence and unsaturated hydrocarbons, including circular, cyclopentadiene and Dicyclopentadiene in proportions to most effectively impact on ASPO, with a high content of high molecular weight paraffins, resins and asphaltenes. Unsaturated cyclic hydrocarbons - cyclopentadiene and Dicyclopentadiene contained in fractions 70-S, help to accelerate the process of removal of sediment and increasing the capacity of the solvent. Polar electrolit together with indicated hydrocarbons increases above the influence. Surfactants affect conglomerates ASPO, dispersed them, increasing the available for interaction with the solvent surface and provide the impossibility of re-merging them.

Thus, a new set of components faction 70-165°C, containing, along with aliphatic and aromatic hydrocarbons optionally unsaturated cyclic hydrocarbons (cyclopentadiene and Dicyclopentadiene) with surfactants and polar electrolitos, allows to obtain a new technical result is the acceleration of the process of removing deposits with a simultaneous increase in capacity of the solvent, leading to reduction of the flow of solvent.

Use dobavlaut to 99.2 g of a hydrocarbon fraction with a boiling point 70-165°C, obtained by distillation of liquid pyrolysis products containing 15.9 g of cyclic unsaturated compounds, it is successively added to 0.3 nonionic surfactant OP-10 and 0.5 g of methanol. The resulting mixture is stirred and closed with a glass stopper.

Similarly prepared and other formulations with different ratios of ingredients.

When conducting laboratory tests investigated the following properties of the proposed structure: the removal efficiency of ASPO, the capacity of the dissolution. Data on the composition used ARPD are shown in table 1. Data contents of the ingredients in the proposed formulations are shown in table 2.

Example 2. The proposed formulations were tested on the removal efficiency of sediment method STF-03-153-2001, “laboratory Methods for the determination of solvent, and removing the ability of solvents AFS” (method B).

To test samples of sediment, the characteristics of which are shown in table 1, were formed balls with a diameter of 10-12 mm, which after weighing on an analytical balance, on a metal grid was placed in a measuring cylinder with a capacity of 25 ml, which was pre-filled with 10 ml of the investigated solvent. The tests were carried out for 2 hours, when this is tried deposits, they were removed from the solvent, dried, and weighed on an analytical balance.

Calculation of efficiency of solvent was carried out according to the formula:

where m1- the mass of the sediments after the experiment, g;

m is the mass of sediment collected for the experiment, the

The results are shown in tables 3 and 4.

Example 3. The capacity of the dissolution or the uptake of solvent paraffin proposed method (composition) was determined by the same method (method B) as follows. On a metal grid with a cell size of 2-4 mm2placed accurately weighed quantity of sediment mass 2, Then the grid of sediment was placed in a measuring cylinder with a capacity of 25 ml, which was then combined with the test solvent displacement Y1(10 ml) and left for 30 minutes. After the time of deposition on the grid was removed, examined, and then again lowered into the cylinder and added again the solvent displacement Y2(5 ml). After 30 minutes, the grid of sediments were removed, examined, and then again lowered into the cylinder, adding a new portion of ratories displacement Y3(5 ml). The experiment was continued until complete dissolution (dispersion) deposits.

The capacity of the solvent uptake ASPO) was determined by the ASS="ptx2">

1000 is the conversion factor in kg/m3.

Similarly, we determined the capacity of dissolution of each part in relation to the test ARPD. The results are shown in tables 3 and 4. As can be seen from these tables, for the efficient removal of paraffin four types need no more than 2 hours. However, as the experiments showed, after 1.5 hours of deposits of all types deleted the proposed structures more than 70%. As for the composition of the prototype for the effective removal of four types of deposits required more than 2 hours and after 2 hours, the removal efficiency is less than 60%. While the capacity of known composition against ASPO all four types in 2-2,5 times lower than the proposed solvents.

Example 4 (example of industrial application).

Well 2802 Arlan field is included in the wells, complicated ARPD (layer C; perforation interval 1455,2-1460,0; liquid flow - 11 m3/day; the oil production rate of 8.7 m3/day; the water content of 11%; the dynamic level - 287 m; megacity period - 3 days).

These deposits are observed in the range of 200-600 m, mass average of 200-250 kg of the Composition of deposits is as follows:

paraffins 41,20%

SGAs composition (composition No. 5) and the composition of the prototype as follows. After crimping the supply of solvent in the annulus is pumped 2 m3the proposed composition. Through the truck and pump CA-320 conducted circulation with constant pressure injection and sampling. To stabilize the pressure and rapid method of determining the saturation of the solvent was determined by the degree of purification of the wall of the production string from the ASPO. Likewise tested a composition of the prototype.

The analysis of the results showed that under otherwise equal conditions, the saturation of the solvent of the prototype occurred after 5 wash cycles, and the proposed composition after 10 cycles, 5 wash cycles solvent prototype didn't work, and the solvent continued to feast upon, which, of course, involves the reduction of its consumption. Experience has shown consumption of solvent on prototype 4 m3and the proposed solvent - 2 m3. Time technological operations using the proposed solvent - 1.5 times less than the same time the solvent of the prototype.

Thus, the proposed composition for removing paraffin, having a high dissolution efficiency can be ispolzovaniem.

The composition for removing oil deposits, including hydrocarbon fraction, a surfactant, a polar electrolit, characterized in that the hydrocarbon fraction contains hydrocarbon fraction 70-165°C, obtained from the gasoline fraction of the reforming process, with the addition of 15.9 17.3 percent Dicyclopentadiene, or a specified fraction obtained by distillation of liquid products of pyrolysis, which includes of 15.9 17.3 percent of a mixture of cyclopentadiene and Dicyclopentadiene, in the following ratio, wt.%:

Hydrocarbon fraction 70-165°C, obtained

of the gasoline fraction of the reforming process, with

the addition of 15.9 17.3 percent Dicyclopentadiene

or a specified fraction obtained by distillation

liquid products of pyrolysis, in which

part of 15.9 17.3 percent of a mixture of cyclopentadiene and

Dicyclopentadiene 98,8-99,2

Surfactant 0,3-0,5

Polar electrolit of 0.5-0.7

 

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