RU2223294C1 - Composition for removal of asphaltene-resinous and paraffin deposits - Google Patents

Abstract

FIELD: oil and gas production. SUBSTANCE: composition for removal of asphaltene-resinous and paraffin deposits in production, transportation, and storage systems contains (i) 0.05-0.5% surfactant: oxyethylated monoalkylphenol of general formula RC₆H₄(OC₂H₄)_mOH, in which m=6-10 and R is C₉H₁₉, and bis(alkylpolyoxyethylene) phosphate of general formula [C_nH_2n+1O(C₂H₄O)_q]₂POOR¹, in which n=8-10, q=6, and R¹ is H or K, at their ratio 1: (3-5); (ii) 20-50% aromatic solvent; and (iii) aliphatic solvent (the balance). EFFECT: increased assortment of oil deposit cleansers. 1 tbl, 64 ex

Description

 The invention relates to the oil industry and can be used to intensify oil production, remove asphaltene-resinous and paraffin formations in oil production, transportation and storage systems.

A known composition for removing asphalt-resin-paraffin deposits, including gas gasoline with a number of C ₄ -C ₈ atoms and an oil-soluble surfactant based on monoalkylphenyl ethers of polyethylene glycol [USSR copyright certificate 633887, cl. From 09 to 3/00, publ. 1978].

 This composition has a low removal efficiency of asphalt-resin-paraffin deposits with a high content of asphaltenes.

A known composition for removing tarry asphaltene and paraffin deposits, including a hydrocarbon solvent in the form of a stable condensate and lower C ₁ -C ₃ alkyl alcohols or mixtures thereof as a surfactant [USSR copyright certificate 1162947, class. E 21 B 37/06, publ. 1985].

 The disadvantage of this composition is the low efficiency of removing deposits with a high content of paraffins.

 A known composition for removing asphaltene-resin-paraffin deposits, including ethoxylated monoalkylphenols - neonols, condensation products of diethylene triamine and oleic acid and a hydrocarbon solvent (RF patent 2064954, CL 09 K 3/00, publ. 1996).

 The disadvantages of this composition include the low removal efficiency of deposits with a high content of asphaltenes and paraffins.

 The closest in technical essence and the achieved result is a composition for removing asphaltene-resinous and paraffin deposits (ARPD), containing aromatic and aliphatic solvents and a mixture of surfactants, consisting of ethoxylated alkyl phenols, ethoxylated higher alcohols and sulfonated products (patent RF 2137796, C. From 09 To 3/00, publ. 1998).

 However, this composition is ineffective in removing old deposits and deposits subjected to heat treatment, for example, after hot flushing wells.

 The proposed invention solves the problem of increasing the efficiency of removing asphaltene-resinous and paraffin deposits.

The problem is solved in that the composition for removing asphaltene-resinous and paraffin deposits, including a surfactant, aliphatic and aromatic solvents, as a surfactant contains ethoxylated monoalkylphenols of the general formula (I)
RC ₆ H ₄ (OC ₂ H ₄ ) _m OH,
where m = 6-10, R = C ₉ H ₁₉ ,
and bis (alkylpolyoxyethylene) phosphate of the general formula (II)
[C _n H _{2n + 1} O (C ₂ H ₄ O) _q ] ₂ POOR ¹ ,
where n = 8-10, q = 6, R ¹ = H or K,
when the ratio of the mixture of these surface-active substances as I: II = 1: 3-5, while all of these ingredients are taken in the following ratio, wt.%:
The specified mixture of surface-active substances (I + II) - 0.05-0.5
Aromatic solvent - 20-50
Aliphatic Solvent - Else
The essential features of the invention are:
1. The use of surfactants - ethoxylated monoalkylphenols of General formula (I)
RC ₆ H ₄ (OC ₂ H ₄ ) _m OH,
where m = 6-10, R = C ₉ H ₁₉ .

2. Use of a surfactant - bis (alkylpolyoxyethylene) phosphate of the general formula (II)
[C _n H _{2n + 1} O (C ₂ H ₄ O) _q ] ₂ POOR ¹ ,
where n = 8-10, q = 6, R ¹ = 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 a mixture of surfactants in the total volume of the composition is 0.05-0.5 wt.%.

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

SUMMARY OF THE INVENTION
The task of cleaning wells from paraffin is currently only partially solved. When using existing methods, the wells are not completely cleaned of asphalt-resin-paraffin deposits, especially old ones, and in some cases it is even impossible. The repeated removal of paraffin deposits after hot flushing of downhole equipment is fraught with significant difficulties and material costs.

 From the patent and scientific and technical literature, we do not know the compositions for the removal of paraffin, containing a combination of the above ingredients in the proposed quantitative ratio, which allows us to conclude that the claimed technical solution is new.

 The presence of higher removing properties of the proposed composition is due to the fact that the claimed combination of its ingredients provides, along with high dissolving ability and high dispersing ability, and this process covers the entire spectrum of organic sediment deposits. From the current level of technology, we do not know that the ingredients included in the proposed composition provide similar properties, which allows us to conclude that the proposed technical solution meets the criterion of "inventive step".

To obtain the proposed composition used the following substances:
- surfactants:
a) as ethoxylated monoalkylphenols - AF ₉ neonol -6 TU 38.507-63-171-91 or neonol AF ₉ -10 TU 38.507-63-300-93;
b) bis (alkylpolyoxyethylene) phosphate (F) according to TU 6-02-1148-78 with amendment 1-4 or bis (alkylpolyoxyethylene) potassium phosphate (FC);
- aromatic hydrocarbons: benzene or toluene, or ethylbenzene, or butylbenzene, or their fractions, or mixtures thereof (ethylbenzene fraction according to TU 6-01-10-37-78 with amendment 4 (EBF); butylbenzene fraction according to TU 38.10297-78 with amendment 4 (BBF); light pyrolysis resin according to TU 38.402-62-144-93 with amendment 1, 2 (LPS);
- aliphatic hydrocarbons: n-pentane or n-hexane, or n-heptane, or n-octane, or n-decane, or a mixture of n-hydrocarbons - extraction gasoline according to TU 38.101303-72 (BE), or gasoline unstable according to TU 38.101524 -93 (BN), or stable gasoline in accordance with GOST 2177-82 (GB), or hexane fraction according to TU 38.103830-83 (GF).

 The proposed composition is obtained by simple mixing of the starting components.

 To prove compliance of the invention with the criterion of "industrial applicability" we give examples of specific performance.

Example 15
To 30 g of the butylbenzene fraction was added 69.95 g of unstable gasoline. To the resulting mixture was added 0.05 g of a surfactant mixture consisting of 0.01 g of neonol AF ₉ -6 and 0.04 g of bis (alkylpolyoxyethylene) phosphate. Then the mixture was stirred until a homogeneous mass.

Example 37
To 50 g of light pyrolysis resin, 49.9 g of hexane fraction was added. To this mixture was added 0.1 g of a surfactant mixture consisting of 0.017 g neonol AF ₉ -10 and 0.083 g of bis (alkilpolioksietilen) of potassium phosphate. Then the mixture was stirred until a homogeneous mass.

Example 44
To 30 g of the ethylbenzene fraction, 69.7 g of gasoline was added. To this mixture was added 0.3 g of a surfactant mixture consisting of 0.075 g neonol AF ₉ -10 and 0.225 g of bis (alkilpolioksietilen) phosphate. Then the mixture was stirred until a homogeneous mass.

 Similarly, other formulations were prepared with different ratios of ingredients.

 The proposed composition was tested for the effectiveness of the removal of paraffin under static conditions at room temperature according to the method developed at the Research Institute of Oil and Gas Industry To do this, AFS samples weighing 3-4 g were placed in a metal mesh basket with a mesh size of 1.5 • 1.5 mm. An ASPO basket was weighed with an accuracy of ± 0.002 g and placed in a sealed glass cell with a capacity of 100 ml. 40 ml of the test composition was introduced into the cell and kept under static conditions for 4 hours. A basket with ARPD residues and a filter with a precipitate obtained after filtering the test composition were dried in air to constant weight. The effectiveness of the removal of paraffin was determined by the sum of the dissolved and dispersed parts.

Deposits taken from well 1553 of the Begeshkinskoye field having the composition, wt.%:
Asphaltenes - 30.26
Resins - 9.44
Paraffins - 48.67
The table shows the effectiveness of the studied compounds.

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

Claims (1)

Composition for removing asphaltene-resinous and paraffin deposits, including a surfactant, aliphatic and aromatic solvents, characterized in that it contains oxyethylated monoalkylphenols of the general formula (I) RC ₆ H ₄ (OC ₂ H ₄ ) _m OH, where m = 6-10, R = C ₉ H ₁₉ , and bis (alkylpolyoxyethylene) phosphate of the general formula (II) [C _n H _{2n + 1} O (C ₂ H ₄ O) _q ] ₂ POOR ¹ , where n = 8-10, q = 6, R ¹ = H or K, when the ratio in the mixture of these surfactants as I: II = 1: 3-5, while all of these ingredients are taken in the following ratio, wt.%: The specified mixture of surface-active substances (I + II) 0.05-0.5 Aromatic solvent 20-50 Aliphatic solvent Else

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