RU2064480C1 - Composition for prevention of asphalthene-resin-paraffin depositions - Google Patents

Abstract

FIELD: oil recovery, transportation and storing of oil. SUBSTANCE: proposed composition contains monoalkyl ether of polyethylene glycol on the base of primary fatty alcohols, oil soluble surface active substance, block copolymer of ethylene oxide and propylene oxide and solvent. EFFECT: improves quality of desired product. 3 tbl

Description

 The invention relates to compositions for preventing deposits of asphaltenes, resins, paraffins and can be used in the processes of extraction, transport and storage of oil.

 A known composition for the prevention of asphaltene-resin-paraffin deposits, including by-products of the production of 2-ethylhexanol and butyl alcohols by the method of oxosynthesis and Diproxamine 157-65M (ed. St. N 1539203, CL 09 K 3/00, E 21 V 37 / 06, 1990). However, the known composition has insufficiently high indicators of the effectiveness of preventing asphaltene-resin-paraffin deposits, low demulsifying effect, high reagent consumption.

 A known composition for preventing asphaltene-resin-paraffin deposits, including the product of the sequential addition of ethylene oxide and propylene to a fatty alcohol tall oil, an additive of polyethylene glycol monoalkyl ether based on primary fatty alcohols ALM-10 / DS-10 / or alkamon DS-10 and a solvent ( Decision on the grant of a patent dated June 17, 93 according to the application N 5007775/03, class C 99 K 3/00).

 The disadvantages of the known composition are not sufficiently high inhibitory properties.

 Closest to the intended is the composition for the prevention of asphaltene-resin-paraffin deposits, including monoalkyl ether of polyethylene glycol based on primary fatty alcohols, the addition of water and a solvent (Decision on the grant of a patent dated 06.22.93 on application No. 5041920/03).

 The disadvantages of the known composition are: low efficiency of inhibition and demulsification for oils containing paraffins, resins, asphaltenes 1: / 0.22-0.28 /: / 0.21-0.23 /, high reagent consumption.

 The basis of the present invention is the creation of a composition for the prevention of asphaltene-resin-paraffin deposits, which simultaneously has a high demulsifying effect at low dosages (costs) of the reagent.

 The problem is solved in that the composition for preventing asphaltene-resin-paraffin deposits, including monoalkyl ether of polyethylene glycol based on primary fatty alcohols, an additive and a solvent, contains an oil-soluble surfactant and an additional block copolymer of ethylene and propylene oxides in the following ratio of components, wt.

Polyethylene glycol monoalkyl ether based on primary fatty alcohols 5-30
Oil soluble surfactant 1-15
Block copolymer of ethylene and propylene oxides 5-25
Solvent Else
I. 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 = 18, m = 20, a product manufactured by the domestic industry under the name Syntanol ALM-10 or syntanol DS-10 according to TU 6-14-664-81.

 II. As a block copolymer, the composition contains the product of the sequential addition of ethylene oxide and propylene to ethylene diamine in methanol - Diproxamine-157-65M / D-157-65M /, manufactured according to TU 38.1011128-87 or Diproxamine-157 / D-157 / according to TU 6-14 -614-76 or block copolymer of ethylene and propylene oxides / Laprol 4202-20B-30 mass fraction 55% / in a methanol-water mixture in a ratio of 4: 1 according to TU 6-55-54-91 / Reapon 4B / or block copolymer of ethylene oxide and propylene based on ethylene or propylene glycol / SNPCH-4410 / according to TU 39-057656-70-OP-160-93.

III. As an oil-soluble surfactant, surfactants of various chemical nature were used. For example: the product of processing a mixture of mono and dialkylphenols with ethylene oxide C _n H _{2n + 1} C ₆ H ₄ 0 / C ₂ H ₄ 0 / H, where n = 8-10, m = 10-12 / OP-10 / according to GOST 84.3 .3-8.1 or polyethylene glycol monostearate C ₁₇ H ₃₅ COO / C ₂ H ₄ O / _m H: where m = 6 according to GOST 8980-75 / Stearox-6 / or Dissolvan 2830 / passport of the company "Hoechst", Germany / or Dissolvan 4411 / passport of the company "Hoechst", Germany / or precoel NGE 8/16 product of the sequential addition of ethylene and propylene oxides to alkyl phenol according to TU BN-P5043-63.

 As a solvent, the composition contains aromatic hydrocarbons - Nefras Ar120 / 200 according to TU 38.101.809-90 or ethylbenzene fraction according to TU 38-101809-90, or aliphatic alcohols, or a mixture of aliphatic alcohol and water, or a mixture of aromatic solvent and aliphatic alcohol and others solvents.

 An analysis of the known solutions selected in the search process showed that in science and technology there is no object similar in 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".

 To prove the compliance of the claimed invention with the criterion of "industrial applicability" we give examples of the preparation of compositions (table. 1).

 Example 1 (prototype).

 To 10 g of syntanol ALM-10 add 5 g of water, mix, then add 85 g of isobutyl alcohol.

 Example 2 (proposed).

 To 5 g of syntanol ALM-10 add 25 g of diproxamine D-157, mix, then add 15 g of Dissolvan 2830, mix, then add 55 g of methyl alcohol.

 Examples 3-107 are carried out analogously to example 2.

The resulting composition is a liquid with a pour point of minus 40 to minus 60 ^o C, a viscosity of 8 to 12 mm ² / s, a density of 920 to 950 g / cm ³ . The proposed composition does not exfoliate during storage and use.

 The effectiveness of the prevention of paraffin is determined by the method of "evaluating the effectiveness of paraffin inhibitors of complex or multiphase effect on the washing of a film of oil" developed at the Research Institute of Oil and Gas and the method of "cold disk" (journal of Canadian pebrol Technol, t. 25, issue 4, p. 40- 44). The dosage of the reagent is 25-100 g / t.

где Э эффективность ингибитора,
М масса парафиноотложений в контрольном опыте, г;
Мп масса парафиноотложений при использовании ингибитора, г.The effectiveness of inhibition of paraffin by the method of "cold disk" is determined by the difference in the mass of deposits on the disk before and after treatment with the inhibitor. Prepare two beakers with 100 ml of oil saturated with paraffin. In one of them, a dosed amount of the inhibitor is injected with a microsyringe or micropipette and mixed. Oil saturated with paraffin, from a glass to the surface of the "cold disk" comes from a hose connected to a peristaltic pump. The surface temperature of the disk is maintained below the temperature at which crystallization of paraffin from oil begins. After the oil drains from the disk, the paraffin deposits with a spatula are removed into a pre-weighed cuvette. The effectiveness of inhibition is determined by the formula:

where e is the effectiveness of the inhibitor,
M is the mass of paraffin deposits in the control experiment, g;
MP mass of paraffin deposits when using an inhibitor, g.

 The tests are carried out on oils 1.2 containing asphaltenes, resins, paraffins in the ratios given in table. 2.

 The test results of the effectiveness of preventing paraffin are presented in table. 2.

The demulsifying effect of the proposed composition is determined by the technique developed at the Research Institute of Oil and Gas Industry. The proposed composition is introduced into the natural emulsion, the mixture is shaken on 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 2 ^° C and 2 hours at a temperature of 60 ^° 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.

 Tests are carried out on oils 1, 2.

 The data table. 3 show an increase in the effectiveness of preventing paraffin and demulsifying effects of the proposed composition compared with the prototype at lower dosages of the reagent. TTT12

Claims (1)

A composition for preventing asphaltene-resin-paraffin deposits, including a block copolymer of ethylene and propylene oxides, a dispersant and a solvent, characterized in that it further comprises an oil-soluble surfactant, and as a dispersant, it contains monoalkyl ether of polyethylene glycol based on primary fatty alcohols of the formula
C _n H _{2n + 1} O (C ₂ H ₄ O) _m H,
where n is 18;
m 20,
and in the following ratio of components, wt. Block copolymer of ethylene and propylene oxides 5 25
Polyethylene glycol monoalkyl ether based on primary fatty alcohols of the specified formula 5 30
Oil soluble surfactant 1 15
Solvent Else

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