The composition for removing asphaltene-resin and paraffin deposits

 

The invention relates to the oil industry and can be used for enhanced recovery of oil, remove asphaltene-resin, paraffin entities in the systems of production, transportation and storage of oil. The composition for removing asphaltene-resin and paraffin deposits includes the surfactant is 0.05-0.5 wt.%, which is used as ethoxylated monoalkylphenols General formula (I) RC₆H₄(OC₂H₄)_mOH, where m=6-10, R=C₉H₁₉and bis(alkylpolyoxyethylene)phosphate of General formula (II) [C_nH_2n+1O(C₂H₄O)_q]₂POOR's¹where n=8-10, q=6, R¹=H or K, when the ratio in the mixture of these surfactants I:II=1:3-5, aromatic solvent - 20-50 wt. %, aliphatic solvent else. table 1.

The invention relates to the oil industry and can be used for enhanced recovery of oil, remove asphaltene-resin, paraffin entities in the systems of production, transportation and storage of oil.

Known composition for removing oil deposits, including natural gasoline with the number of atoms₄-C₈

This composition has a low removal efficiency of oil deposits with a high content of asphaltenes.

Known composition for removal of resin-asphaltene and paraffin deposits, including hydrocarbon solvent in the form of stable gas condensate and lower With₁-C₃alkalemia alcohols or mixtures thereof as surfactants [USSR author's certificate 1162947, CL E 21 In 37/06, publ. 1985].

The disadvantage of this structure is the low efficiency of removal of sediments with high paraffin content.

Known composition to remove asphaltene-resin-paraffin deposits, including ethoxylated monoalkylphenols - neonols, condensation products of Diethylenetriamine and oleic acid and a hydrocarbon solvent (RF patent 2064954, CL 09 To 3/00, publ. 1996).

The disadvantages of this structure should be attributed to the low efficiency of removal of sediments with a high content of asphaltenes and paraffins.

The closest in technical essence and the achieved result is a composition for removing asphaltene-resin and paraffin deposits (ARPD) containing aromatic and aliphatic skilled higher alcohols and sulfonated products (RF patent 2137796, CL 09 To 3/00, publ. 1998).

However, this composition is ineffective when chronic sediment removal and sediment subjected to heat treatment, for example, after the hot leaching wells.

In the proposed invention solves the problem of increasing the efficiency of removal asphaltene-resin and paraffin deposits.

The problem is solved in that the composition for removing asphaltene-resin and paraffin deposits, including surfactant, aliphatic and aromatic solvents, such as surfactants contains ethoxylated monoalkylphenols General formula (I) RC₆H₄(OS₂H₄)_mOH, where m=6-10, R=C₉H₁₉and bis(alkylpolyoxyethylene)phosphate of General formula (II) [C_nH_2n+1O(C₂H₄O)_q]₂POOR's¹where n=8-10, q=6, R¹=H or K, when the ratio in the mixture of these surfactants as I:II= 1: 3-5, with all the ingredients of the composition are taken in the following ratio, wt.%: The mixture of surfactants (I+II) - 0,05-0,5 Aromatic solvent - 20-50 Aliphatic solvent - Rest
The essential features of the invention are:
1. Use OS₂H₄)_mOH,
where m=6-10, R=C₉H₁₉.

2. The use of surfactants bis(alkylpolyoxyethylene)phosphate of General formula (II)
[C_nH_2n+1O(C₂H₄O)_q]₂POOR's¹,
where n=8-10, q=6, R¹=H or K.

3. The ratio in the mixture of these surfactants as I:II=1: 3-5.

4. Aliphatic solvent.

5. Aromatic solvent.

6. The proportion of the mixture of surface-active substance in the total composition is 0.05-0.5 wt.%.

Signs 1, 4, 5 are common with the prototype, signs 2, 3, 6 are the salient features of the invention.

The invention
The task of cleaning wells from ASPO currently solved only partially. When applying the existing methods does not fully clean the wells from oil deposits, especially chronic, and in some cases it is even impossible. Repeated removal of sediment after hot leaching downhole equipment fraught with considerable difficulties and costs.

From the patent and scientific literature is unknown to us structures for removal of paraffin, containing the set of the above ingredients to supply the p> The presence of higher-removing properties of the proposed structure is explained by the fact that the claimed combination of its ingredients provides along with high solubility and high dispersing ability, and this process covers the whole range of organic components of the sediment deposits. The current level of technology we don't know what the ingredients included in the composition, provide similar properties, which allows to make a conclusion on the conformity of the proposed technical solutions to the criterion of "inventive step".

To obtain we used the following substances:
- surfactants:
and as polyoxyethylene monoalkylphenol - neonol AF₉-6 on THE 38.507-63-171-91 or neonol AF₉-10 on THE 38.507-63-300-93;
b) bis(alkylpolyoxyethylene)phosphate (f) TU 6-02-1148-78 with ISM.1-4 or bis(alkylpolyoxyethylene)potassium phosphate (FC);
aromatic hydrocarbons: benzene, or toluene, or ethylbenzene, or butylbenzoyl or their fractions, or mixtures thereof (ethylbenzene fraction on THE 6-01-10-37-78 with ISM.4 (EBF); butylbenzene fraction on THE 38.10297-78 var.4 (BBF); light pyrolysis resin specifications 38.402-62-144-93 amended.1, 2 (FSC);
- aliphatic ug is raccoony on THE 38.101303-72 (NR), or gasoline unstable beyond 38.101524-93 (bn), or natural gasoline stable according to GOST 2177-82 (GB), or hexane fraction on THE 38.103830-83 (GF).

The proposed composition are simply mixing the starting components.

For evidence of conformity of the invention, the criterion of "industrial applicability" provide examples of specific performance.

Example 15
To 30 g butylbenzene fractions were added 69,95 g unstable gasoline. To the mixture was added 0.05 g of a mixture of surfactants consisting of 0.01 g of neonols AF₉-6 and 0.04 g of bis(alkylpolyoxyethylene)phosphate. Then the mixture was stirred to obtain a homogeneous mass.

Example 37
To 50 g of light pyrolysis tar was added to 49.9 g of hexane fraction. To the mixture was added 0.1 g of a mixture of surfactants consisting of 0,017 g neonols AF₉-10 and 0.083 g of bis(alkylpolyoxyethylene)of potassium phosphate. Then the mixture was stirred to obtain a homogeneous mass.

Example 44
To 30 g etilbenzene faction added 69.7 g natural gasoline. To the mixture was added 0.3 g of a mixture of surfactants consisting of 0.075 g of neonols AF₉-10 and 0,225 g bis(alkylpolyoxyethylene)phosphate. Then the mixture was stirred to obtain a homogeneous mass.

Similarly prepared other compounds with different ratio in anatoy temperature according to the method developed Discloses. For this purpose, samples of sediment weighing 3-4 g was placed in a basket of wire mesh with a mesh size of 1.51,5 mm Basket with ARPD weighed with an accuracy of0.002 g and placed in a sealed glass cell with a capacity of 100 ml In the cell was brought to 40 ml of the investigated structure and maintained in static conditions 4 o'clock the Basket with the remnants of ASPO and the filter residue obtained after filtration of the investigated composition was dried in air to constant weight. The removal efficiency of sediment was determined by the sum of dissolved and dispersed parts.

As the deposits taken deposits from a well 1553 Beleschenko field, having the composition, wt.%:
Asphaltenes - 30,26
Resin - 9,44
Paraffin - 48,67
The table shows the effectiveness of the studied compounds.

The data in the table show that the proposed structure exceeds the known efficiency of the prototype structure.

Claims

The composition for removing asphaltene-resin and paraffin deposits, including surfactant, aliphatic and aromatic solvents, characterized in that the surface(OS₂H₄)_mOH,

where m=6-10, R=C₉H₁₉,

and bis(alkylpolyoxyethylene)phosphate of General formula (II)

[C_nH_2n+1O(C₂H₄O)_q]₂POOR's¹,

where n=8-10, q=6, R¹=H or K,

when the ratio in the mixture of these surfactants as I:II=1:3-5, with all the ingredients of the composition are taken in the following ratio, wt.%:

The mixture of surfactants (I+II) 0,05-0,5

Aromatic solvent 20-50

Aliphatic solvent Else