Composition for breaking oil-water emulsions and protection of oilfield equipment from asphaltene - maloperation deposits

 

The invention relates to the preparation of oil and can be used for dehydration and desalting of crude oil with simultaneous protection of the equipment from asphaltene-paraffin deposits. Composition for breaking oil-water emulsions and protection of oilfield equipment from asphaltene-paraffin deposits include block copolymers of ethylene oxides and propylene-based glycerin, diepoxide ID-4200 and the solvent. Technical challenge is the creation of highly effective composition for destruction of vysokoporistyh oil-water emulsions Devonian horizon and protection of oilfield equipment from asphaltene-paraffin deposits while reducing its specific consumption. table 2.

The invention relates to the preparation of oil and can be used for dehydration and desalting of crude oil with simultaneous protection of the equipment from asphaltene-maloperation deposits (ARPD).

Known composition for dehydration and desalting of crude oil and inhibition asphaltene-maloperation sediments containing oxides block copolymers of ethylene-based glycerin, and oxyalkylene resin L-5001 and the solvent (RF patent 2152976, IPC With 10 G 33/04, 01 F 17/42, about the.

Closest to the proposed invention is a composition for breaking oil-water emulsions and protection of oilfield equipment from ASPO, including block copolymers of ethylene oxides and propylene-based glycerin, oxyalkylene polyester resin Dissolved 3264 and the solvent (RF patent 2152424, IPC With 10 G 33/04, publ. 10.07.2000,). However, such a composition provides a deep dehydration of natural emulsions at high unit costs (50-75 g/t of oil) and not effective at destruction vysokoporistyh emulsions Devonian horizon.

Object of the invention is the creation of highly effective composition for destruction of vysokoporistyh oil-water emulsions Devonian horizon and protection of oilfield equipment from ASPO while reducing its specific consumption.

The problem is solved in that the composition for breaking oil-water emulsions and protection of oilfield equipment from asphaltene-maloperation deposits (ARPD), including block copolymers of ethylene oxides and propylene-based glycerin, oxyalkylene polyester resin and the solvent, as blockcopolymer contains oxides block copolymers of ethylene and propylene-based g the following ratio of components, wt.%: Block copolymers of ethylene oxides and propylene, the above - 26-60 Diepoxy ID-4200 - 8-13 Solvent - Rest as oxyalkylene polyester resin used diepoxide ID-4200 (passport company "p-Chem, USA).

As blockcopolymer oxides of ethylene and propylene-based glycerol with molecular weight of 6000.E. used Laprol 6003-2B-18 - simple polyester obtained ALCOHOLATES polymerization of propylene oxide with glycerol, followed by blockcopolymers with ethylene oxide (THE 2226-020-10488057-94).

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

The proposed composition are simply mixing the components.

Example of getting a part.

In a round bottom flask equipped with a stirrer and a thermometer, download 42 g of polyether brand Laprol 6003-2B-18, 8 g of diepoxide ID-4200 and 50 g of oil nefras A130/150. The mixture is stirred for 15 minutes at a temperature of 45-50oC.

Samples of the compositions shown in table 1.

Getting the rest of the and with the stated intervals.

The resulting compositions are homogeneous transparent movable liquid from light yellow to light brown in color, density at 20oFrom - 0.88 to 0.95 g/cm3, kinematic viscosity at 20oWith - no higher than 60 mm2/s

Tests demulsifying effectiveness conducted on the oil with the following physical-chemical properties: density at 20oWith - 0,870-0,880 g/cm3; kinematic viscosity at 20oWith - 30,5-31,5 mm2/s; mass fraction, %: sulfur - of 1.40 and 1.80, asphaltenes - 3,40-3,90, silicate resins - 11,38-11,40, paraffin - 3,50-4,00, the cut - 45-55, the density of the formation water at 20oWith a 1.01-1.04 g/cm3.

In a portion of oil-water emulsion is metered feel demulsifier, shake for 5 minutes and put on static sucks with thermostating at 38-40oC. After 2 hours, measure the residual water content of the oil phase according to GOST 14870-77. The results are given in table 2.

Determination of the protective effect of paraffin carried out by the following method: in a conical flask with a capacity of 250 ml was placed 25 ml of produced water total mineralization 200 g/l and dosed in 5 ál. Then the flask of 1.25 g) and heated on a water bath until the lead is up stream of running water until 12-14oWith, shaking it in a circular motion. This fixed the dispersion of paraffin, slush and puttying them walls of the flask.

Dispersion: the results are considered excellent when the particle size of ASPO 0.1 to 3 mm (100%), good - 0,1-5 mm (50-70%), satisfactory - 0.1 to 7 mm (30-50%), above 7 mm - poor.

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

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

The results are shown in table 2.


Claims

Composition for breaking oil-water emulsions and protection of oilfield equipment from asphaltene-maloperation deposits, including block copolymers of ethylene oxides and propylene-based glycerol with molecular weight of 6000.E., oxyalkylene polyester resin and a solvent, characterized in that as oxyalkylene polyester resin contains diepoxide ID-4200 when Ledoux ID-4200 - 8-13
Solvent - Rest

 

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2 cl, 2 tbl, 5 ex

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