Composition for dehydration and desalting of crude oil

 

(57) Abstract:

The invention relates to the preparation of oil by dehydration and desalting for demulsification of oil and improve the rheological properties. Composition for dehydration and desalting of crude oil contains non-ionic demulsifier - block copolymers of ethylene oxides and propylene-based monoethylene glycol with a molecular weight of 4,300 and a solvent. The composition additionally includes VAT residue production butyl ether of monoethylene glycol and diethylene glycol, wt. %: Meg 0,5-4,0, diethylene glycol 0,5-4,0, butyl ether of monoethylene glycol 1,5-13,0, butyl ether of diethylene glycol, a 9.5 75,0, the mixture of the butyl esters of tri-, Tetra - and pentamethylheptane of 0.5 to 4.0. The ratio of components in the composition, wt.%: block copolymers of ethylene oxides and propylene-based monoethylene glycol 15,0-50,0; VAT residue 5,0-40,0; the solvent (methanol) to 100.0. Effect: the use of the composition improves the efficiency of dehydration and desalting of crude oil, and also improves the flow properties of petroleum products. 1 Il., table 4.

The invention relates to the preparation of oil and can be used for dehydration and desalting of crude oil, as well as PR is about the discharge of produced water.

Known nonionic demulsifying agent containing copolymers of ethylene oxides and propylene-based glycol and propylene glycol - Reapon-4B (see 1. THE 6-55-54-91).

The disadvantage of this demulsifier is low demulsifying efficiency in the destruction of high-viscosity oils coal-bearing horizon, and oils containing mechanical impurities. Reapon-4V slightly improves the rheological properties of the listed types of oil products.

Known composition for dehydration and desalting oil emulsion containing 50-55% aqueous-methanol solution of nonionic blockcopolymers of ethylene oxides and propylene - Reapon-4V and polyglycolide resin - waste production etilenglikola and additionally water in the following ratio, wt. %: 50-55% aqueous-methanol solution of nonionic blockcopolymer oxides of ethylene and propylene 70-82; waste production etilenglikola - polyglycolide resin 7-17; water - other (see 2. RF patent 2091435, BI 27, 27.09.97).

The disadvantage of this composite combination of reagents is that in this unstable mixture composition and molecular mass distribution of waste production etilenglikola the settings above composition

The closest present invention is a composition for dehydration and desalting of crude oil containing 37,0-62,0 wt.% blockcopolymer ethylene and propylenoxide, 0.5 to 5.0 wt.% mono-C2-C4-Olkiluoto ether of ethylene glycol and diethylene glycol and up to 100% of solvent in the following ratio: copolymers of ethylene and propylenoxide 37-62; mono-C2-C4-alkilany ether of ethylene glycol and diethylene glycol 0,5-5,0; solvent - rest (see 3. RF patent 2009165, BI 5, 15.03.94).

The disadvantage of this method is unsatisfactory demulsifying efficiency in the dehydration of coal oils, high viscosity at the specific consumption of reagents 50-100 g/t of oil. In addition, the above compounds exhibit low efficacy in reducing viscous properties of the production wells.

The objective of the invention is to increase the effectiveness of the composition for dehydration and desalting of crude oil and the expansion of the range of effective surfactant reagents for dehydration and desalting of crude oil, as well as improving the rheological properties of the transported products.

The problem is solved by a composition for dehydration and desalting of crude oil, containing neionogena 4300 and the solvent. Moreover, it additionally contains a VAT residue production butyl ether of monoethylene glycol and diethylene glycol, comprising (wt.%): Meg 0,5-4,0, diethylene glycol 0,5-4,0, butyl ether of monoethylene glycol 1,5-13,0, butyl ether of diethylene glycol, a 9.5 75,0, the mixture of the butyl esters of tri-, Tetra - and pentamethylheptane 0,5-4,0 in the following ratio, wt. % include block copolymers of ethylene oxides and propylene-based monoethylene glycol - 15,0-50,0; VAT residue - 5,0-40,0; the solvent (methanol) - up to 100.0.

Characteristics of the used substances.

Block copolymers of ethylene oxide and propylene, for example, based on glycols - Reapon-4B:

N(C2H4O)n(C3H6O)mOJSC(C3H6O)m(C2H4O)nN,

where A= -C2H4- or-C3H6-, n=14-16, m=24-27 with molecular weight of 4300; mass fraction of the main substances 555%; kinematic viscosity at 0oC 40 mm2/C; temperature limits of lightening solution concentration of 100 g aqueous solution of NaCl 50-60oC; pour point not higher than minus 50o(See 1. THE 6-55-54-91).

VAT residue production and butyl ethers of ethylene glycol (see 4. THE 6-01-646-84) and Ditylenchus 8-15, butyl ether of diethylene glycol 70-75, a mixture of the butyl esters of tri-, Tetra - and pentamethylheptane 3-5. The refractive index n20=1,4; relative density204= 0,950-0,970; kinematic viscosity20= 6-10 mm2/c.

The composition is prepared by simple mixing of the components.

A specific example of preparation 1 g of the composition: 0.35 g of blockcopolymer oxides of ethylene and propylene-based monoethylene glycol with molecular weight of 4300 added 0.20 g of the cubic residue and add 0.45 g of solvent (methanol).

From the obtained composition is prepared 1% aqueous solution and determine its demolicious efficiency.

The definition of a demulsifying performance was carried out on artificial emulsions of oils Oreshkova (Yakutia) and the Verkhnechonskoye (Irkutsk region) deposits with a water content of 30 wt.%, as well as samples of natural emulsions coal Romashkinskoye oil field water content 56 and 57.4 wt. % selected from well 26720 with time interval 1 month, respectively (see tab. 1-4).

In the emulsion dose of the test compound, the mixture is shaken on a laboratory shaker for 10 minutes at a temperature of 55-60oC. Then thermostatically residual water content in the oil is carried out in accordance with GOST 14870-77 method Dean-stark.

Rheological studies are carried out on a rotational viscometer "RHEOTEST-2 coaxial measuring device. Determine the dependence of the dynamic viscosity (mPas) water-oil emulsions from the temperature (to(C) at the shear rate (Drc-1) 381-1corresponding to the linear velocity v (m/s) of the fluid in the pipeline is approximately 0.8-1.0 m/s (Fig.1).

The analysis of the results shows that the use of the proposed structure allows for effective dehydration and desalting, and also improves the flow properties of petroleum products.

Composition for dehydration and desalting of crude oil containing nonionic demulsifier - block copolymers of ethylene oxides and propylene-based monoethylene glycol with a molecular weight of 4,300 and a solvent, characterized in that it further comprises a VAT residue production and butyl ethers of ethylene glycol and diethylene glycol, comprising, by weight. %: Meg 0,5-4,0, diethylene glycol 0,5-4,0, butyl ether of ethylene glycol 1,5-13,0, butyl ether of diethylene glycol, a 9.5 75,0, the mixture of the butyl esters of tri-, Tetra - and pentamethylheptane 0,5-4,0 in the following ratio compoletely (methanol) - To 100.0

 

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