RU2115667C1 - Product of consequent addition of ethylene oxide and propylene oxide to high fatty alcohol and composition for prevention of asphalt-resin-paraffin depositions - Google Patents

Abstract

FIELD: petroleum industry. SUBSTANCE: product of consequent addition of ethylene oxide, propylene oxide and high alcohol of C₁₆-C₂₀-fraction comprises these components at their molar ratio (10-14):(16-20):1, respectively. Composition for prevention of asphalt-resin-paraffin depositions comprises, %: product of consequent addition of ethylene oxide, propylene oxide to high fatty alcohol, 10-30; modifying additive, 1-3; organic solvent, the balance. Proposed composition has low solidification point and is stable by storage while its high effectiveness retains. EFFECT: improved quality of product. 4 cl, 3 tbl

Description

 The invention relates to the protection of oilfield equipment from asphaltene-resin-paraffin deposits (paraffin) and can be used to combat paraffin in the processes of oil production and transportation.

The closest in technical essence and the achieved result is an inhibitor of asphaltene-resin-paraffin deposits, including the product of the sequential addition of ethylene oxide and propylene oxide to a fatty alcohol of tall oil, a modifying additive - monoalkyl ether of polyethylene glycol based on primary fatty alcohols or alkoxymethylmethyl diethylammonium with the following solvents , wt.%:
The product of the sequential addition of ethylene oxide and propylene oxide to fatty alcohol of tall oil - 10 - 30
Modifying additive - 1 - 3
Solvent - Other
(RF patent N 2027730, MKI C 09 K 3/00 1995).

 However, the known composition requires the use of expensive and scarce raw materials and has insufficiently high technological indicators.

 The present invention is based on the task of creating a domestic product of sequential addition of ethylene oxide and propylene oxide to higher fatty alcohol (VGS) as the starting material for the composition to prevent paraffin deposits, which are not inferior in terms of effectiveness to the original analogue, but possessing higher processability.

The problem is solved by obtaining the product of the sequential addition of ethylene oxide and propylene oxide to the VZhS fractions C ₁₆ -C ₂₀ with their molar ratio (10-14): (16-20): 1, respectively, as a starting component for the composition to prevent ASPO and composition to prevent paraffin, including the above addition product, a modifying additive and an organic solvent in the following ratio, wt.%:
The product of the sequential addition of ethylene oxide and propylene oxide to the VGS fraction C ₁₆ -C ₂₀ - 10 -30
Modifying additive - 1 - 3
Organic Solvent - Else
In an advantageous embodiment of the composition, it additionally contains water in the following ratio of components, wt.%:
The product of the sequential addition of ethylene oxide and propylene oxide to the VGS fraction C ₁₆ -C ₂₀ - 10-30
Modifying additive - 1 - 3
Water - 4 - 6
Organic Solvent - Else
Product sequential addition of ethylene oxide and propylene oxide to VZHS fraction C ₁₆ -C ₂₀ prepared in a conventional way to obtain non-ionic surfactants by oxyalkylation of compounds with labile hydrogen (Schoenfeld N. surfactants based on ethylene oxide. M .: Chemistry, 1982, p. 65, p. 18).

The modifying additive is:
- 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 , where n = 10-18, m = 8-10 under the trade name Sintanol ALM-10 (TU 6- 14-864-88) or DS-10 (TU 6-14-577-88);
- alkoxymethylmethyldiethylammonium methyl sulfate of the general formula C _n H _{2n + 1} OCH ₂ N ⁺ (CH ₃ ) (CH ₂ CH ₃ ) ₂ ] [CH ₃ SO ₄ ], where n = 10-18 under the trade name Alkamon DS-10 (TU 6 -14-664- 81);
- bis (alkylpolyoxyethylene) phosphate of the formula [C _n H _{2n + 1} O (C ₂ H ₄ )) _m ] ₂ POOH, where n = 8-10, m = 6 under the trade name Oxyphos KD-6.

 As a solvent, the composition contains aliphatic alcohol (methyl or butyl, or isobutyl, or isopropyl) or aromatic hydrocarbons (Nefras Ar-120/200 or ethylbenzene fraction, or butylbenzene fraction), or a mixture thereof.

 A comparative analysis of the features of the invention with the prototype allows us to conclude that the claimed product of accession and the totality of the claimed essential features of the composition are previously unknown.

 From the known level of science and technology, no inventions were found that are similar to the claimed product of accession and similar to the claimed combination of characteristics of the composition to prevent paraffin and which would lead to a higher technical result than the claimed products, which allows us to conclude that the claimed product and composition meet the criteria " novelty "and" inventive step ".

To prove the conformity of the proposed solution to the criterion of "industrial applicability", we give examples of the preparation of the product of addition of ethylene oxide and propylene oxide to the VZhS fraction C ₁₆ -C ₂₀ .

Example 1. In a reactor with a capacity of 500 ml load 43 g of VGS fractions C ₁₆ -C ₂₀ and 1.26 g of a catalyst of crystalline KOH. To remove oxygen, purge with nitrogen and vacuum with stirring at a temperature of 80-100 ^o C with increasing temperature to 110 ^o C. 86.7 g of ethylene oxide are fed into the reactor and the process is carried out at a temperature of 115 ^o C and a pressure of 200-300 KPa until complete absorption ethylene oxide. Then the product is hydroxypropylated by adding 171.4 g of propylene oxide at 120 ^° C. and a pressure of 250-500 kPa.

 Examples 2-3. Carried out analogously to example 1, changing the number of products of accession and reaction conditions.

 The data in examples 1-3 are summarized in table 1.

The product of the sequential addition of ethylene oxide and propylene oxide to the higher fatty alcohol of the C ₁₆ -C ₂₀ fraction is a viscous liquid from light yellow to light brown in color.

 We give examples of the preparation of the composition and the results of testing it for effectiveness.

 Example 1 (prototype). To 10 g of the sequential addition product, 12 mol of ethylene oxide and 18 mol of propylene oxide to 1 mol of tall oil fatty alcohol add 3 g of ALM-10 syntanol and 87 g of isobutyl alcohol. The mixture is stirred until a homogeneous composition is obtained.

 Example 2. (according to the claimed composition). To 10 g of the PP-1 addition product, 3 g of ALM-10 syntanol and 87 g of methyl alcohol are added. The mixture is stirred until a homogeneous mass.

 Examples 3-12. Carried out analogously to example 2, changing the qualitative and quantitative composition.

 Compositions to prevent paraffin, obtained in examples 1-12, are tested for effectiveness.

где
Э - эффективность ингибирования, %;
М₀ - масса парафиноотложений в контрольном опыте, г;
М_п - масса парафиноотложений при использовании ингибитора, г.Determining the effectiveness of the prevention of paraffin is carried out according to the methodology "Evaluating the effectiveness of paraffin inhibitors of complex or multiphase effect on the washing of an oil film" developed at the Research Institute of Oil and Gas Industry (groups 10 and 12 of Table 3) and the "cold disk" method (The Journal of Canadian Petrol. Technol . "v.25, issue 4, pp. 40-44), (columns 11 and 13 of Table 3). The effectiveness of the action of paraffin inhibitors according to this method is determined by the difference in the mass of deposits on the surface of the "cold" 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 introduced by a microsyringe or micropipette and mixed. Oil saturated with paraffin deposits from a glass to the surface of the "cold" disk comes from a hose connected to a perilstatic 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 - inhibition efficiency,%;
M ₀ - the mass of paraffin deposits in the control experiment, g;
M _p - the mass of paraffin deposits when using an inhibitor, g

 The tests are carried out on oils of type 1 and 2 with the content of paraffin, resins and asphaltenes in the ratios given in table 2.

The data according to examples 1 to 12 and the properties are summarized in table 3. The claimed composition for preventing paraffin compared with the prototype has a lower pour point to minus 60 ^o C, which is 2-3 times lower than that of the prototype, more stable while maintaining high inhibition efficiency.

Claims (2)

1. The product of the sequential addition of ethylene oxide and propylene oxide to the higher fatty alcohol of the C ₁₆ - C ₂₀ fraction with their molar ratio (10 - 14): (16 - 20): 1, respectively, as a starting component for an inhibitor of asphaltene-tar-paraffin deposits. 2. The composition of the inhibitor of asphaltene-tar-paraffin deposits, including the product of the sequential addition of ethylene oxide and propylene oxide to a higher fatty alcohol, a modifying additive and an organic solvent, characterized in that as a product of the sequential addition of ethylene oxide and propylene oxide to a higher fatty alcohol it contains the product according to claim .1 in the following ratio of components, wt.%:
The product of the sequential addition of ethylene oxide and propylene oxide to higher fatty alcohol fraction C ₁₆ - C ₂₀ - 10 - 30
Modifying additive - 1 - 3
Organic Solvent - Else
3. The composition according to claim 2, characterized in that it additionally contains water in the following ratio of components, wt.%:
The product of the sequential addition of ethylene oxide and propylene oxide to higher fatty alcohol fraction C ₁₆ - C ₂₀ - 10 - 30
Modifying additive - 1 - 3
Water - 4 - 6
Organic Solvent - Remaining

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