RU2203307C1 - Composition for destroying crude oil-water emulsions and protecting oil-field equipment from asphaltene-resin-paraffin deposits - Google Patents

Abstract

FIELD: crude oil treatment. SUBSTANCE: composition serving for crude oil dehydration and desalting and simultaneously protecting equipment from asphaltene-tar-paraffin deposits contains glycerol-based ethylene oxide/propylene oxide block copolymer, diepoxide, and solvent. EFFECT: enhanced efficiency of highly resinous crude oil-water emulsion destruction and equipment protection, and simultaneously reduced specific consumption of composition.

Description

 The invention relates to the preparation of oil and can be used for dehydration and desalination of oil while protecting equipment from asphaltene-resin-paraffin deposits (paraffin).

 A known composition for dehydration and desalting of oil and inhibition of asphaltene-resin-paraffin deposits, containing a block copolymer of ethylene oxides based on glycerol, as well as an oxyalkylated resin L-5001 and a solvent (RF patent 2152976, IPC C 10 G 33/04, 01 F 17/42 , published on July 20, 2000). The composition is not effective enough for the destruction of highly resinous emulsions of the Devonian horizon.

 Closest to the proposed invention is a composition for breaking oil-water emulsions and protecting oilfield equipment from ASPO, including a block copolymer of ethylene and propylene oxides based on glycerol, an oxyalkylated polyester resin Dissolvan 3264 and a solvent (RF patent 2152424, IPC C 10 G 33/04, publ. July 10, 2000). However, this composition provides a depth of dehydration of natural emulsions at high specific consumption rates (50-75 g / t of oil) and is not effective enough for the destruction of highly resinous emulsions of the Devonian horizon.

 The objective of the invention is to create a highly effective composition for the destruction of highly resinous water-oil emulsions of the Devonian horizon and the protection of oilfield equipment from paraffin deposits while reducing its specific consumption.

The problem is solved in that the composition for breaking oil-water emulsions and protecting oilfield equipment from asphaltene-resin-paraffin deposits (ASPO), including a block copolymer of ethylene and propylene oxides based on glycerol, an oxyalkylated polyester resin and a solvent, contains block copolymer of ethylene and ethylene block copolymer based on glycerol with a molecular weight of 6000 cu, and as an oxyalkylated polyester resin - diepoxide ID-4200 in the following ratio, wt.%:
The block copolymer of ethylene and propylene oxides mentioned above is 26-60
Diepoxil ID-4200 - 8-13
Solvent - Other
As oxyalkylated polyester resin, diepoxide ID-4200 (passport from p-Chem, USA) is used.

 As a block copolymer of ethylene and propylene oxides based on glycerol with a molecular weight of 6,000 cu Laprol 6003-2B-18 is used - a polyether obtained by alcoholate polymerization of propylene oxide with glycerin followed by block copolymerization with ethylene oxide (TU 2226-020-10488057-94).

As solvents can be used aromatic solvents (or mixtures thereof):
- solvent oil heavy nefras A120 / 200 (TU 38.101809-90);
- solvent oil nefras A130 / 150 (GOST 10214-78);
- toluene (GOST 5789-78);
- ethylbenzene fraction (EBF) (TU 38.30225-81);
- butylbenzene fraction (BBP) (TU 38.10297-76).

 The proposed composition is obtained by simple mixing of the components.

 An example of obtaining the composition.

In a round-bottom flask equipped with a stirrer and a thermometer, 42 g of Laprol 6003-2B-18 polyester, 8 g of ID-4200 diepoxide and 50 g of A130 / 150 petroleum nefras are charged. The mixture is stirred for 15 minutes at a temperature of 45-50 ^o C.

 Sample compositions are shown in table 1.

 Obtaining the remaining samples shown in table 1, carry out similarly, varying the ratio of the components in accordance with the declared intervals.

The resulting compositions are homogeneous transparent mobile liquids from light yellow to light brown in color, density at 20 ^o C - 0.88-0.95 g / cm ³ , kinematic viscosity at 20 ^o C - not higher than 60 mm ² / s .

Tests of demulsifying effectiveness are carried out on oils with the following physicochemical properties: density at 20 ^o C - 0.870-0.880 g / cm ³ ; kinematic viscosity at 20 ^o C - 30.5-31.5 mm ² / s; mass fraction,%: sulfur - 1.40-1.80, asphaltenes - 3.40-3.90, silicate resins - 11.38-11.40, paraffins - 3.50-4.00, water cut - 45- 55, the density of produced water at 20 ^o C is 1.01-1.04 g / cm ³ .

The test demulsifier is dosed into a weighed portion of the oil-water emulsion, shaken for 5 minutes and set on a static sludge with thermostating at 38-40 ^o C. After 2 hours, the residual water content of the oil phase is measured in accordance with GOST 14870-77. The test results are shown in table 2.

Determination of the effectiveness of the protective action against paraffin is carried out according to the following method: in a conical flask with a capacity of 250 ml, 25 ml of produced water of total salinity of 200 g / l are placed and 5 μl of reagent are metered into it. Then, 1.25 g of ARPD is placed in the flask and heated in a water bath until the deposits are completely melted, carefully mixing the contents of the flask by rotation. After that, the mixture in the flask is cooled under a stream of water to 12-14 ^o C, shaking it in a circular motion. In this case, the dispersion of the AFS is fixed, and the walls of the flask are stuck and coated with them.

 Dispersion: the results are considered excellent when the particle size of the ARPD is 0.1-3 mm (100%), good - 0.1-5 mm (50-70%), satisfactory - 0.1-7 mm (30-50%), above 7 mm - unsatisfactory.

 Paraffin sticking to the walls of a glass conical flask in% of the working surface: the result is excellent if the sticking is up to 5%, good - up to 10%, satisfactory - up to 40%, unsatisfactory - above 40%.

 Lubrication of the walls of the flask in% of the working surface: the result is excellent if the glossing is not more than 5%, good - up to 20%, satisfactory - up to 50%, unsatisfactory - more than 50%.

 The results are shown in table 2.

Claims (1)

Composition for breaking oil-water emulsions and protecting oilfield equipment from asphaltene-resin-paraffin deposits, including a block copolymer of ethylene and propylene oxides based on glycerol with a molecular weight of 6,000 cu, an oxyalkylated polyester resin and a solvent, characterized in that it contains hydroxyalkylated polyester ID-4200 in the following ratio of components, wt.%:
The block copolymer of ethylene and propylene oxides mentioned above is 26-60
Diepoxide ID-4200 - 8-13
Solvent - Other

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