RU1809911C - Method for preliminary phase separation of high-viscous gas-water-petroleum emulsion - Google Patents

Abstract

SUMMARY OF THE INVENTION: The oil is transported, treated with a demulsifier, separated into phases by reducing the speed of movement in the final section of the pipeline and selected in separate streams. The speed of movement of the emulsion is reduced to 0.12-0.2 m / s at a time of movement at this speed of at least 20 minutes. 2 tab.

Description

The invention relates to the oil industry, in particular to methods for pre-phase separation of highly viscous gas-oil-oil emulsions in the preparation of oil in the fields.

The purpose of the invention is to increase the efficiency of the process of preliminary phase separation of a high viscosity gas-oil-oil emulsion,

This goal is achieved by the described method, including transporting a highly viscous gas-oil-oil emulsion through a pipeline, processing it with a demulsifier, phase separation by reducing the movement speed in the final section of the pipeline, and selection by separate flows.

It is new that the speed of movement of a high-viscosity gas-oil-oil emulsion is reduced to 0.12-0.2 m / s with a travel time of at least 20 minutes at this speed.

Tests of the method were carried out at the site for the preparation of high-viscosity oil produced using thermal methods at the Karazhanbas field.

The highly processed gas-oil-gas oil emulsion was characterized by the following parameters:

water content

the content of fur impurities

gas content

iron sulfide content: emulsion density

at 20 ° C

emulsion viscosity

at 20 ° C

The emulsion was characterized by an extremely fine dispersion of formation water droplets and increased foaming, which significantly complicated the process of separating water from oil,

The method was carried out in the following sequence.

High viscous gas-oil-water emulsion in the amount of 380 m / h together with the introduced demulsifier disolvan 4411 at the rate of 260 g / t of oil after preliminary destruction of the emulsion in the pipe 65%

1.26% 9-11 me / t

25 mg / l 980 kg / m3 3490 mm2 / s

ate

with

with

about y

H)

AND

g

In the waters of the well production system, they were introduced into a tube phase divider (TDF) made of a pipe with a diameter of 1200 mm and a length of 100 m, for preliminary phase separation of the emulsion into phases before the oil treatment unit. The emulsion in the TDF was transported at a speed of 0.1-0.35 m / s for 10-430 min from the point of entry to the point of selection of the separated phases. The temperature of the process is 28 ° C.

Studies of the separation of high viscosity oil emulsions into separate phases were carried out by analyzing samples taken over the cross section of the final section of the TDF. The research results are given in table. 1.

From the table. It can be seen from Figure 1 that at speeds of movement within the range of 0.12-0.2 m / s and a time of movement at this speed for 20 minutes or more, efficient separation of the highly viscous gas-oil-in-oil emulsion into separate phases is ensured: the gas is located at the top; oil with associated formation water (emulsion) is in the middle and free water is in the lower zones along the TDF section. This is explained by the fact that when the motion mode is close to turbulent, some violation of the gas-oil-oil emulsion flow structure in the TDF occurs, in which the process of gas bubble formation and formation of a free volume of gas, separation of water droplets and formation of a free volume of formation water is intensified. Free gas from the upper zone of the TDF is sent to gas separators to separate the dropping liquid, formation water to the treatment plants, and oil with residual water content to the deep dehydration and desalination unit.

The results of studies of the residual water content in oil after TDF in Zai

The dependences on the speed and time of motion of a highly viscous gas-oil-oil emulsion are given in Table. 2.

From the table. 2 it can be seen that the most efficient separation of water from oil occurs at emulsion speeds of 0.12-0.2 m / s and a travel time of 20 minutes or more at this speed. With these operating parameters of the emulsion 10 movement, the water content in oil is not more than 10%.

Using the method allows:

to increase the efficiency of the preliminary phase separation process of high-viscosity gas-oil-oil emulsion and 15 to reduce the residual water content in oil from 20-40% (prototype) to 8-10%;

unload oil treatment plants. from an excess volume of produced water coming with oil by 55-57% and, accordingly, reduce gas consumption by 10-15% to heat the emulsion with deep dehydration and desalting of oil;

to reduce the metal consumption of oil treatment facilities by eliminating the use of tanks or horizontal settling apparatus for preliminary phase separation of highly viscous gas-oil-oil emulsions from the technology.

Claims (1)

Formula of the invention A method for preliminary phase separation of a high viscosity gas oil emulsion, including its transportation, treatment with a demulsifier, separation into phases by reducing the movement speed in the final section of the pipeline and selection by separate flows, characterized in that the speed of the high viscosity gas oil emulsion is reduced to 0.12 -0.2 m / s with a travel time of at least 20 minutes at this speed. Table twenty 25 thirty 35 40 Continuation of Table 1 table 2