SU1442641A1 - Agent for producing viscous oil - Google Patents

Abstract

This invention relates to oil production, in particular, compositions for reducing the viscosity of heavy oil being lifted from wells. The purpose of the invention is to increase the effectiveness of a reagent to reduce the viscosity of oil produced. The reagent includes saline water, a hydrocarbon component and a surfactant, which is used as waste of light kerosene fractions, in the following ratio of ingredients, wt.%: Alkaline waste of light kerosene fractions 9-11, saline water 72-75, hydrocarbon component 15- 18. Alkaline wastes of light kerosene fractions are non-toxic homogeneous brown liquid with a specific odor, containing free alkali 0.60-0.68, organic matter not less than 20% and having a kinematic viscosity of 2.87, freeze point t. Vippe 12? C, density at 20 ° C is not I less than 104G kg / m. 1 tab. F

Description

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  This invention relates to oil production, in particular, compositions for reducing the viscosity of heavy oils being lifted from wells.

The purpose of the invention is to increase the effectiveness of the reagent to reduce the viscosity of the oil produced.

The reagent has the following composition, wt%:

Alkaline wastes of light kerosene fractions 9-11 Mineralized water 72-75 Hydrocarbon component15-18 Alkaline wastes of light kerosene fractions are a brown liquid with a specific odor. The content of free alkali is 0.60-0.68, pH 12.4- 13.3, organic matter is not less than 20%. Kinematic viscosity 2,87 freezing temperature is not higher - 12 ° C, density at 20 ° C not less than 1041 kg / m. Alkaline waste of light kerosene fractions is non-toxic, biologically harmless, and does not emit harmful substances during transportation and operation.

Diesel fuel, gas condensate or low-viscosity oil are used as hydrocarbon components, but other hydrocarbons can be used, for example, n-pentane, isopentane, n-hexane, n-octane, iso-octane, n-propane, n -decane, undecane, etc. Diesel fuel with a mass fraction of sulfur up to 0.2% and a pour point t - 35 C.

In terms of physico-chemical parameters, m-HEATING should meet the following requirements and standards:

Kinematic viscosity at 20 ° C

mm2 / s (cSt) Pour point

Massova, dol sulfur,%

Concentration of actual resins

mg per 100 cm of fuel

Density-at, kg / m

Physical and chemical indicators of gas condensate: density 784.6 kg / M mol.m 147; pour point does not exceed -15 ° C. Gas condensate contains, wt%: sulfur 0.03; gel resins 0.55; paraffin 1.6.,

Physical and chemical indicators of light oil: - density 810 mol. m. 162; viscosity 3.7 MPa-s; Pour point is not higher than -12 ° C. Light oil contains, wt%: paraffins 2.7; silica gel resins 1.87; asphaltenes 0.04.

The total mineralization of water can vary from 0.72 to 3.74 wt.%, The pH of the water is in the range of 7.5-8.4, the average salt content in the dry residue of water, wt.%:, 4; MgS046.6; CaS043.45 KCl 1.7; CaCOj 0.3; MgBr2053; NaCl else.

Physical-x1-1mic indicators of formation water: density at 30 ° С 1000 total salt content

15 20

25 3,051 g / l; pH 7.97.

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To obtain the reagent, the components included in it are mixed in an aqueous medium to obtain a homogeneous system. Under laboratory conditions, the preparation of the reagent is carried out by mixing the ingredients on an electric stirrer at 1,400 rpm for 5 minutes.

The table shows the dependence of the dynamic viscosity of the oil on the quantitative ratio of the ingredients in the reagent. The studies were carried out on oil with a B51 zkost at 10 Pa-s at.

As can be seen from the table, with the optimum ratio of components (composition 2), the same decrease in viscosity is achieved as in the case of using light oil. At the same time, the oil produced is considerably cheaper compared to the use of light oil as a viscosity reducer.

Example. Used reagent for oil production with a viscosity of 10 Pa-s at 40 ° С from a well with a flow rate of 30.

Next to the wellhead, a 60 m tank is installed. The reagent components (composition 3) are loaded in the following quantities: 8 tons of diesel fuel, 555 tons of alkaline waste of light kerosene fractions, and 36.5 tons of seawater. So have in

the total amount of liquid in the tank is 50 tons. They begin to mix the existing heterogeneous system by closed circulation for 5-6 hours until a homogeneous system is obtained, after which the reagent is fed into the annulus of the well. For this purpose, a special dosing pump is used that is capable of taking the agent from the tank and pumping it in the required amount, for example, 10 tons / day. (which is approximately 30% of the flow rate of the well), into the annulus - into the wells. After a day from the beginning of the dosing, the well can be operated by a well pump with a normal flow (30-40) tons / day. subject to continuous dosing,

Claims (1)

Invention Formula Reagent for the extraction of high-viscosity oil, including mineralized (WATER, hydrocarbon component and surfactant, characterized in that, in order to increase its effectiveness in reducing the viscosity of the oil produced, it contains alkaline waste of light kerosene fractions as a surfactant in the following ratio of ingredients, May,%: Alkaline waste of light kerosene fractions Mineralized water Hydrocarbon component 9-11 72-75 15-18 Note. Researches are conducted on oil with a viscosity of 10 Pa-s. at 40 ° C. Highly watered oil is used (water content is 70%),