SU1736548A1 - Method of separating gas-oil-water mixture - Google Patents

Abstract

The invention relates to systems for collecting and preparing the production of oil wells and can be used in oilfield facilities to separate the gas and water oil streams into their components. The aim of the invention is to increase the separation efficiency. The method involves the separation of the mixture in the tank on inclined longitudinal shelves and phase output. The shelves are made of two parts located at different angles to the horizontal. The ratio of the cross-sectional area between the shelf and the horizontal from the point where the shelf connects to the container wall to intersect with the overlying shelf to the inter-shelf area exceeds the volume content of water in the initial mixture by percentage. 2 Il. w fe

Description

The invention relates to systems for collecting and preparing the production of oil wells and can be used in oilfield facilities to separate gas and water flows into their components.

The purpose of the invention is to increase the separation efficiency.

The goal is achieved in that the separation is carried out on shelves made of two parts located at different angles to the horizontal, while the ratio of the cross-sectional area between the shelf and the horizontal, drawn from the junction of the shelf with the wall to the intersection with the upper shelf inter-shelf area, exceeds the percentage of the water content in the initial mixture.

FIG. 1 shows a separator for implementing the method, a longitudinal section; 2 is a section A-A in FIG. one.

Separator 1 includes a gas pre-sampling device (not shown), overflow partitions 2 and 3 are installed inside the separator, dividing the apparatus into storage zones B and C for the separated water and oil phases and settling zone D, where inclined shelves 4 are located, having , with the exception of the lower, slotted holes 5 at the junction of the raised part of the shelves with the side surface of the vessel. On one side, the end parts of the shelves 4 are attached to a vertical wall 6 connected to a distribution ridge H

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which 7, the outlet openings 8 of which are led into inter-shelf cavities. Between the upper and lower generators of the apparatus, the vertical wall 6 forms segmented openings. The mixture to be separated is introduced into the separator through pipe 9. Water, oil and gas are discharged through pipes 10-12, respectively.

The method is implemented as follows.

The gas-water-water mixture, having passed the gas pre-selection device, is fed through the pipe 9 and the distribution comb 7 to the cavity between the shelves 4, which have a different slope in cross section. The right part of the inter-shelf space in the direction of flow of the liquid is intended to clarify the separated free water. In order for the path of movement of the oil droplets emerging in it to be the shortest, the slope of the shelves does not exceed 2 °.

The angle of inclination of the left part of the shelves having a fracture along the vertical axis of the apparatus is determined by the volume content of water g of the initial mixture, i.e. the cross-sectional area between the lower shelf and the horizontal, drawn from the place of its connection with the apparatus wall to the intersection with the higher shelf, should be in percentage terms greater than the volume of water in the incoming liquid. This eliminates the secondary mixing of oil with water at its outlet from the slotted holes 5. In addition, multiple-inclined broken shelves allow you to avoid cross-current and, consequently, mixing the oil and water phases at their exit from the shelf shelf.

Separated from the oil through the overflow partition 3 enters the cumulative zone B, from where it goes through pipe 11 to the final preparation. Water flows to the clarified phase in reverse current under the lower shelf, where there are also conditions for separating and separating the enlarged oil droplets, and through the overflow partition 2 enters storage zone B, from which it is removed from the apparatus through nozzle 10. Due to the installation of overflow partitions 2 and 3 and the removal of outlet nozzles 10 and 11 to zones B and C in the zone of separation and settling G, a constant hydrodynamic situation is maintained: the level and volume ratio of the oil and water layers are eliminated. The latter is due to a certain ratio of overflow heights (2)

doc If the height hi of the overflow partition 3 is determined by design considerations (number of shelves and inter-shelf distance), then height h2

the overflow septum 2 is determined from the equilibrium hydrostatic pressure of the pillars of liquids:

Гп | / ЭПС- - / эь (1-с) 2р, kg / m2 (1)

where / OH ipv are the densities of oil and water included in the composition of the initial liquid mixture, respectively, kg / m;

c is the volume content of oil in the incoming mixture, fractions.

Equality (1) determines h2

(pH - c-b (1-c) - / ob

p

Due to the upward direction of movement of the oil-water flow entering the apparatus, possible gas plugs in it enter under the upper shelf and tangentially through the walls of the apparatus through slots 5 are led out into its gas zone. In the inter-shelf space below

the gas bubbles evolving from liquids accumulate under the lower surface of the overlying shelf, coalesce and, due to the tilt, move to the slit holes through which, together with the oil

move up. The gas from the gas zone of the apparatus is discharged through the pipe 12.

In order to avoid exposure to excessive gas pressure (additionally released from the water phase when

the hydrostatic pressure at the moment of overflow into the accumulation zone B) for a change in the level in zone G, said zones communicate with each other through an opening left between wall 6 and the upper generatrix

apparatus.

The use of the invention greatly improves the quality of the phases to be separated.

Claims (1)

Claims The method of separation of the gas-water mixture, including separation of the mixture in the tank on inclined longitudinal shelves and phase output, characterized in that, in order to increase the separation efficiency, the separation is carried out on shelves made of two parts located at different angles to horizontally, while the ratio of the cross-sectional area between the shelf and the horizontal, drawn from the place where the shelf connects to the vessel wall to the intersection with the overlying shelf to the inter-shelf area, exceeds the percentage water content in the starting mixture. 12 increased eight