RU2086599C1 - Reagent for preventing asphalthene-resin-paraffin deposits - Google Patents

Abstract

FIELD: production, transportation and storage of petroleum. SUBSTANCE: reagent comprises asphalthene-resin-paraffin deposits, wt.-%: fatty acid-based oxyethylated amines, 5-25; primary fatty alcohol - based polyethylene glycol monoalkyl ether of general formula: C_nH_2n+1O(C₂H₄O)_mH wherein n = 10-18 and m=8-10 ethylene and propylene oxide block copolymer, 5-25; and solvent, the balance. EFFECT: improved properties. 5 tbl

Description

 The invention relates to reagents for the prevention of asphaltene-resin-paraffin deposits (paraffin) and can be used in the processes of production, transportation and storage of oil.

Known reagent for preventing asphaltene-resin-paraffin deposits, including by-products of the production of 2-ethylhexanol and butyl alcohols by oxosynthesis and diproxamine-157-65 M [1]
However, the known reagent has a low demulsifying effect, requires a large consumption during use and does not exhibit anti-corrosion properties.

 Known reagent for the prevention of asphaltene-resin-paraffin deposits, including a surfactant (diproxamine-157 or precoel NGE 10/16), a dispersant additive syntaphate-912 and an aromatic solvent. This reagent does not possess, in addition to the inhibitory paraffin inhibiting properties, a demulsifying effect and a protective effect against corrosion.

Closest to the proposed is a reagent for preventing asphaltene-resin-paraffin deposits, including 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 solvent.

The disadvantages of this reagent are: low demulsifying effect; lower efficiency of preventing asphaltene-resin-paraffin deposits for oils containing paraffin, resins, asphaltenes in the ratio 1: (0.76 ^o C 4.7) :( 0.096 ^o C 1.6), respectively.

 The basis of the invention is the creation of a reagent to prevent asphaltene-resin-paraffin deposits, which has both a high de-emulsifying effect and a protective effect against hydrogen sulfide corrosion.

The problem is solved in that the reagent for preventing asphaltene-resin-paraffin deposits includes ethoxylated amines based on fatty 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 H) _m H,
where n = 10 18, m = 8 10;
solvent and block copolymer of ethylene oxide and propylene in the following ratio of components, wt.

где R углеводородный радикал C₁₀-C₁₇;
x + y=11 или 15.Oxyethylated fatty acid amines 5 25
Polyethylene glycol monoalkyl ether based on primary fatty alcohols of the above formula 1 15
Block copolymer of ethylene oxide and propylene 5 25
Solvent Else
As an oxyethylated fatty acid-based amine, the reagent contains: N-alkyl-N, N-di (polyethylene glycol) amines based on coconut oil acids oxamine L-15 of the general formula
C _p H _{2p + 1} N (C ₂ H ₄ O) _m H,
where p = 10 12, n + m = 15
(Handbook "Surfactants", L. Chemistry, 1979, p. 309) or ethoxylated primary monoamines of the general formula

where R is a hydrocarbon radical of C ₁₀ -C ₁₇ ;
x + y = 11 or 15.

These products are marketed under the name Noramox C ₁₁ or Noramox C ₁₅ , or Normox O ₁₁ , Noramrx O ₁₅ ("Prospectus from Seca, 1990, p. 5).

As a monoalkyl ether of polyethylene glycol based on primary fatty alcohols, the reagent contains syntanol ALM-10 according to TU 6-14-864-88 or syntanol DS-10 according to TU 6-14-577-88, having the general formula
C _n H _{2n + 1} O (C ₂ H ₄ O) _m H,
where n = 10 18, m = 8 10.

As a block copolymer of ethylene and propylene oxides, the proposed reagent contains the product of the addition of ethylene and propylene oxides to ethylene diamine in methanol-Diproxamine -157-65M according to TU 38.1011128-87 with mol. m. 5000 or a block copolymer of ethylene and propylene oxides (Laprol 4202-20 B-30 with a mass fraction of 55%) in a methanol: water mixture in a ratio of 4: 1 according to TU 6-55-54-91 (Reapon-4B) s pier m. 1200, or a block copolymer of ethylene oxide and propylene based on a fatty alcohol fraction C ₁₆ -C ₂₀ according to TU 39-05765670-OP-191-94 (SNPCH-780) with a mol. m. 1840, or a block copolymer of ethylene and propylene oxides based on ethylene and propylene glycol (SNPCH-4410) according to TU 39-057656-70-OP-160-93 with mol. m. 5000, or Dissolvan 4411 ("Passport company Hoechst", Germany) with a pier. m 2500 2500.

As a solvent, the proposed reagent contains aromatic hydrocarbons Nefras A _p 120/200 according to TU 38.101.809.90 or a butylbenzene fraction (BBP) according to TU 38.10297-78, or an ethylbenzene fraction (EBP) according to TU 38-30225-81, or aliphatic alcohols (methyl (MS), or ethyl (ES), or butyl (BS), or isobutyl (IHD), or isopropyl (IPA), or bottoms from the production of butyl alcohols (KOPS) according to TU 38.102167-85, or bottoms from the production of mesitylene (KOM) ) according to TU 38.402-62-68-90, or a mixture of aromatic hydrocarbons with alcohols or with KOM in the ratio of 2.3: 1, or a mixture of aliphatic alcohol with water in accordance with (20 ^o C 10): 1.

Example 1 (known). To 15 g of oxamine L-15 add 5 g of syntanol ALM-10, mix and add 80 g of nephras A _p 120/20. The mixture is stirred until smooth.

Example 2 (proposed). 1 To 5 g of oxamine L-15, 15 g of syntanol ALM-10 are added with stirring. Then add 25 g of diproxamine 157-65 M, mix and add 55 g of nephras A _p 120/200. The mixture is stirred until a homogeneous mass.

 Examples 3 to 62 are carried out analogously to example 2.

The resulting reagent is a homogeneous yellow liquid with a density of 890 ^o C 920 kg / m ³ , viscosity 3 6 mm ² / s, pour point minus 40-minus 50 ^o C.

 The composition of the reagent is given in table 1.

 The effectiveness of preventing paraffin deposits is determined by the method of "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 tests are carried out on the oils of fields 1, 2, 3 with the content of asphaltenes, resins, paraffins, are given in table. 2.

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

 Determination of water content in oil is carried out in accordance with GOST 14870 77 by the Dean-Stark method.

 The tests are carried out on oils 1, 2, 3, the composition of which is given in table. one.

 The protective effect of corrosion is 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 dosage of the reagent in all experiments was 200 mg / L.

 The test results of the effectiveness of preventing the paraffin of the proposed reagent, its demulsifying effect and the protective effect of corrosion are presented in table. 3-5. It also presents data on the effectiveness of the prototype.

 As the results of table. 3-5, the proposed reagent has better performance in comparison with the prototype: while maintaining high efficacy of preventing paraffin and sedimentation inhibition of hydrogen sulfide corrosion, it additionally has a demulsifying effect.

Claims (1)

Reagent for the prevention of asphaltene-resin-paraffin deposits, including 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 a solvent, characterized in that it further comprises an ethoxylated amine based on fatty acids and a block copolymer of ethylene and propylene oxides in the following ratio of components, wt. Polyethylene glycol monoalkyl ether 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 1 15
Oxyethylated fatty acid amine 5 25
Block copolymer of ethylene and propylene oxides 5 25
Solvent Rest

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