RU2115682C1 - Composition for prevention of asphaltene-resin-paraffin and paraffin hydrate depositions - Google Patents

Abstract

FIELD: oil recovery; oil transportation and its storage. SUBSTANCE: composition comprises oxyalkylated amino compound, monoalkyl ether of polyethylene glycol on the base of primary fatty alcohols (having common formula C_nH_2n+1O(C₂H₄O)_mH where n=10-18, m=8-10), triethanol amine, methanol and solvent. EFFECT: prevented formation of asphaltene-resin-paraffin depositions and paraffin hydrate depositions. 5 tbl

Description

 The invention relates to compositions for preventing asphaltene-resin-paraffin deposits and can be used in the processes of extraction, transport and storage of oil.

 A known composition for preventing asphaltene-resin-paraffin deposits, having a demulsifying effect, including the product of the addition of ethylene and propylene oxides to ethylene diamine in methanol - diproxamine-157-65M and by-products of the production of 2-ethylhexanol and butyl alcohols by oxosynthesis [1]. However, this composition does not prevent paraffin hydrate deposits.

 A known composition for the prevention of asphaltene-resin-paraffin deposits, having demulsifying properties, including a block copolymer of ethylene and propylene oxides, monoalkyl ether of polyethylene glycol based on primary fatty alcohols, oil-soluble surfactant and solvent [2]. This composition is not effective in preventing paraffin hydrate deposits and corrosion.

Closest to the proposed technical solution is a composition for preventing asphaltene-resin-paraffin deposits, which has a protective effect against corrosion, including N-alkyl-N, N'-di (polyethylene glycol) amines based on coconut oil acids, 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 and the solvent [3]. The disadvantages of this composition are: the lack of a demulsifying effect and the low effect of preventing paraffin deposits.

 The objective of the invention is the creation of a composition to prevent asphaltene-resin-paraffin and paraffin-hydrate deposits, which simultaneously has a demulsifying effect and a protective effect against corrosion.

The problem is solved in that the composition for preventing asphaltene-resin-paraffin deposits, including an oxyalkylated amino compound, 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 and the solvent additionally contains methanol and triethanolamine in the following ratio of components, wt.%: Oxyalkylated amino compound 5-35; 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; 5-10; triethanolamine 5-15; methanol 10-30; solvent rest.

 As an oxyalkylated amino compound, the composition contains the product of the addition of ethylene and propylene oxides to ethylene diamine - diproxamine-157 according to TU 6-14-614-76 (or diproxamine 157-65M according to TU 6-16-617-76), or N-alkyl-N , N'-di (polyethylene glycol) amines based on coconut oil acids - oxamine-15 (Surfactants. Reference book. - L .: Chemistry, 1979, p. 309).

Polyethylene glycol monoalkyl ether based on primary fatty alcohols of the general formula С _n Н _{2n + 1} О (С ₂ Н ₄ О) _m Н, where n = 10-18, m = 8-10 has the technical name syntanol ALM-10 according to TU 6- 14-864-88.

 Triethanolamine (TEA) is used according to TU 6-02-916-79, methanol - according to GOST 2222-78.

 As a solvent, the composition contains bottoms from the production of butyl alcohols by the method of oxosynthesis (COBBS) according to TU 38.102167-85, or aromatic hydrocarbons - Nefras Ar 120/200 according to TU 38.101.809-90, or ethylbenzene fraction (EBF) according to TU 38.30225-81, or butylbenzene fraction (BBF) according to 38.10297-78, or aliphatic alcohols (butyl alcohol) (BS) according to GOST 5208-81, or isopropyl alcohol (IPS) according to GOST 9805-84).

 An analysis of the known solutions selected in the search process showed that in science and technology there is no object similar to that proposed for the claimed combination of features and the presence of the above properties and advantages, which allows us to conclude that the invention meets the criteria of "novelty" and "inventive step".

 Examples of the preparation of the compositions are given in table 1.

 Example 1 (prototype). To 15 g of oxamine-15 add 5 g of syntanol ALM-10, mix and add 80 g of aromatic hydrocarbons. The mixture is stirred until smooth.

Example 2. To 5 g of diproxamine-157 add 10 g of syntanol ALM-10 and 15 g of triethanolamine, the mixture is heated to 40-50 ^o C, stirred, add 30 g of methanol and 40 g of COBPS. Mix the mixture until a homogeneous mass.

 Examples 3-18 are performed analogously to example 2, changing the qualitative and quantitative ratio of the components.

The proposed compositions are a liquid from light yellow to brown in color with a density of 860-920 kg / m ³ , a viscosity of 5-30 mm ² / s, the pour point is (-30) - (- 50) ^o C.

 The proposed composition is tested for the effectiveness of preventing asphaltene-resin-paraffin deposits (paraffin) on oil N 3 (see table 2).

 The effectiveness of preventing paraffin deposits is determined by the methodology "Evaluating the effectiveness of paraffin inhibitors with a complex effect on the washing of oil films, washing and dispersion of paraffin wax" developed at the Research Institute of Oil and Gas Industry. The test results are shown in table.3.

 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 lowering the hydrate formation temperature are given in Table 3.

The demulsifying effect is determined by the technique developed at the Research Institute of Oil and Gas Industry. The test reagent is introduced into the natural emulsion of a particular deposit in an amount of 0.02%. The mixture is shaken in a Wagner laboratory shaker for 30 minutes with an amplitude of 6-7 cm and a number of double strokes of 120 minutes at room temperature. Then thermostat for 2 hours at a temperature of 20 ^o C and for 2 hours at a temperature of 60 ^o C and measure the amount of released water.

 The determination of the residual water content in oil is carried out in accordance with GOST 14870-77 by the Dean-Stark method. The test results are given in table.4.

 The protective effect of corrosion was determined according to OST 39-099-79 "Corrosion inhibitors. Method for assessing the effectiveness of the protective effect of corrosion inhibitors in oilfield wastewater." A standard solution was used as an aggressive medium, which corresponds in its composition to the wastewater of an oil field. The reagent dosage in all experiments was 200 g / t. The test results of the protective effect against corrosion are presented in table 5.

 The analysis of these tables shows that the proposed composition has a higher protective effect against paraffin, prevents paraffin-hydrate deposits, has a higher demulsifying effect and a protective effect against corrosion.

Claims (1)

Composition for preventing asphaltene-resin-paraffin and paraffin-hydrate deposits, including an oxyalkylated amino compound, 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, and a solvent, characterized in that it further comprises triethanolamine and methanol in the following ratio of components, wt.%:
Oxyalkylated amino compound - 5 - 35
Polyethylene glycol monoalkyl ether based on primary fatty alcohols of the given formula - 5 - 10
Triethanolamine - 5 - 15
Methanol - 10 - 30
Solvent - Other

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