RU2083627C1 - Inhibitor of asphaltene-tar-paraffin and paraffin-hydrate deposits - Google Patents

Abstract

FIELD: crude oil treatment. SUBSTANCE: invention refers to oils having high gas factor and producing asphaltene-tar-paraffin and paraffin-hydrate deposits. Inhibitor containing 15-25 wt % of oxyalkylated amine, 15-25 wt % of methanol and/or dimethyldioxane, and still residue from production of butyl alcohols using hydroformylation method (to balance) additionally contains 2-10% of polyethylene glycol monoalkyl ether having general formula C_nH_2n+1O(C₂H₄O)_mH where n = 10-18 and m = 8-10. EFFECT: increased inhibition activity. 2 cl, 3 tbl

Description

 The invention relates to the oil industry and can be used in the extraction of oils with a high gas factor containing asphaltene-resin-paraffin (paraffin) and paraffin hydrate deposits.

A known inhibitor of ASP deposits, including the product of the addition of ethylene and propylene oxides to ethylenediamine diproxamine 157 65M and by-products of the production of 2-ethylhexanol and butyl alcohols by oxosynthesis [2]
This inhibitor is designed to prevent asphaltene-resin-paraffin deposits and is ineffective for inhibiting paraffin hydrate deposits.

Closest to the invention is a paraffin hydrate scale inhibitor comprising 20 60% solution of hydroxyalkylated alkyl phenols in aromatic hydrocarbons, 40 50% solution of pyridine compounds in ethanol and methanol [1]
The disadvantages of the known inhibitor are:
instability and delamination, especially at low temperatures;
deficiency of raw materials (propylene oxide) to obtain an active base - hydroxyalkylated phenol;
insufficiently high efficiency in relation to mixed asphaltene-resin-paraffin hydrate deposits for oil fields with a high gas factor;
insufficient decrease in the temperature of formation of paraffin hydrates;
the possibility of a negative effect of pyridine compounds contained at a high concentration (40-50%) in ethanol and up to 33 wt. in an inhibitor, on the quality of petroleum refined products.

 The basis of the invention is the creation of an inhibitor of asphaltene-resin-paraffin and paraffin hydrate deposits, which is highly effective in preventing mixed asphaltene-resin-paraffin hydrate deposits for oils with a high gas factor and a significant decrease in the temperature of formation of paraffin hydrates while maintaining a protective effect against hydrogen sulfide corrosion.

 The problem is solved in that the inhibitor of asphaltene-resin-paraffin and paraffin hydrate deposits, including a nonionic surfactant based on an oxyalkylated product, a dehydrating component, for example methanol, and a solvent, as a nonionic surfactant contains an oxyalkylated amino compound as a dehydrating component dimethyldioxane or a mixture of methanol with dimethyldioxane, and, as a solvent, bottoms from the production of butyl alcohols oxosynthesis method in the following ratio of components, wt.

Oxyalkylated amino compound 15 25
Methanol and / or dimethyl dioxane 2 10
Distillation residues of butyl alcohol production by oxosynthesis - Else
As an oxyalkylated amino compound, the inhibitor contains the product of the addition of ethylene and propylene oxides to ethylenediamine diproxamine 157-65M according to TU 38.1011128-87 or N-alkyl-N, N -di (polyethylene glycol) amines based on coconut oil acids of the general formula C _p H _{2p + 1} N (C ₂ H ₄ O) _m H (C ₂ H ₄ O) _n H, where P 10 12, n + m 15 oxamine L-15
(Handbook "Surface-active substances", L. Chemistry, 1979, p. 309), or genamine oxyethylated fatty amine of the CS series with the degree of hydroxyethylation 12 14 ("Surface phenomena and surfactants" edited by A.A. Abramzon , L. Chemistry, 1984, p. 246).

 Methanol is used in accordance with GOST 2222-78, dimethyl-dioxane - "Reference chemist", M. 1964, p. 650.

An advantageous embodiment of the invention is an inhibitor of paraffin and paraffin hydrate deposits, including an oxyalkylated amino compound / methanol and / or dimethyl dioxane and bottoms from the production of butyl alcohols by oxosynthesis and additionally monoalkyl ether of polyethylene glycol based on primary fatty alcohols of the general formula C _n H _{2n + 1} O (C ₂ H ₄ O) _m H,
where n 10 18, m 8 10,
in the following ratio of components, wt.

Oxyalkylated amino compound 15 25
Methanol and / or dimethyl dioxane 2 10
Monoalkyl ether of polyethylene glycol based on primary fatty alcohols of the above formula 2 5
Distillation residues of butyl alcohol production by oxosynthesis - Else
Polyethylene glycol monoalkyl ether based on primary fatty alcohols of the general formula C _n H _{2n + 1} O (C ₂ H ₄ O) _m H,
where n 10 18, m 8 10,
produced by domestic industry and has the technical name syntanol ALM-10 (TU 6-14-864-88) or DS-10 (TU 6-14-577-86).

 VAT bottoms in the production of butyl alcohols are used in accordance with TU 38.102167-85.

 An analysis of the known technical solutions selected in the search process showed that in science and technology there is no object similar in terms of the claimed combination of features and advantages, which allows us to conclude that the criteria of “novelty” and “inventive step” are met.

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

 Example 1 (prototype). To 5 g of SNPCH-7212 add 5 g of Sever-1 and 90 g of methanol. The mixture is stirred.

 Example 2 (proposed). To 15 g of diproxamine 158-65M add 10 g of methanol and 75 g of bottoms from the production of butyl alcohols by oxosynthesis. The mixture is stirred until a homogeneous solution is obtained.

 Examples 3 to 11 are performed analogously to example 2.

 Example 12 A mixture of 3 g of methanol and 3 g of dimethyldioxane and 75.5 g of COBPS was added to 18.5 g of oxamine L-15. The mixture is thoroughly mixed.

 Example 13 is similar to example 2.

 Example 14. To 15 g of diproxamine 157-65M add 10 g of methanol, 5 g of syntanol ALM-10 and 70 g of COBPS. The mixture is stirred.

 Examples 15 to 25 are performed analogously to example 14.

Options for the composition of the inhibitor are given in table. 1 and 2. The resulting inhibitor is a clear liquid from light yellow to light brown in color with a density of 82 860 kg / m ³ , viscosity at 20 ^o C 8 12 mm ² / s The pour point of the inhibitor is -30 - (-) 50 ^o C.

 The proposed inhibitor is tested for the effectiveness of preventing paraffin in oils I and II and paraffin hydrates in oils III and IV. The composition of the oils is given in table. 3.

 The effectiveness of inhibition of paraffin is evaluated by the method of "cold disk" (Journal of Canadian Petrol. Technol. T. 25, issue 4, p. 40 44) and by the method of assessing the degree of dispersion developed by NPO Neftepromkhim. The inhibitor compositions and test results are given in table. one.

 The conditions for hydrate formation were studied at a thermobaric test bench according to the method developed at the Research Institute of Oil and Gas Production. Data on reducing the temperature of hydrate formation are given in table. one.

Studies show that the proposed inhibitor is more effective in protecting against paraffin and paraffin hydrates and in lowering the temperature of formation of paraffin hydrates in oils with high gas factor, compared with the prototype, while maintaining a protective effect from hydrogen sulfide corrosion. Low pour point from -30 to -50 ^o C allows its use in regions with a wide temperature range.

Claims (1)

 1. An inhibitor of asphaltene-resin-paraffin and paraffin hydrate deposits, including an oxyalkylated amino compound and bottoms from the production of butyl alcohols by oxosynthesis, characterized in that it additionally contains methanol and / or dimethyldioxane in the following ratio, wt. Oxyalkylated amino compound 15 25
Methanol and / or dimethyldioxane 2 10
Distillation residues of butyl alcohol production by oxosynthesis - Else
2. The inhibitor according to claim 1, characterized in that it further comprises 2 to 10 wt. monoalkyl ether of polyethylene glycol based on primary fatty alcohols of the general formula C _n H _{2 n + 1} O (C ₂ H ₄ O) _m H, where n 10 18, m 8 10.

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