SU1662612A1 - Deaerator - Google Patents

Abstract

The invention relates to devices for the degassing of liquids, namely drilling fluids. The aim of the invention is to increase the efficiency during non-stationary operation. The degasser has a working chamber in which a cyclone is installed. The cyclone in the lower part has a vertical-slot separator and a circular flow damper with windows at the top. In the upper part of the cyclone there are additional windows for overflow of excess drilling mud. Reflectors in the form of multi-colored mesh elements are installed under the flow quencher. 1 hp ff, 1 ill.

Description

The invention relates to the technique of drilling oil and gas wells, in particular to the degassing agent washing liquid

The purpose of the invention is to increase the efficiency during non-stationary work.

The drawing shows a schematic diagram of the degasser.

The degasser consists of a working chamber 1 with outlet pipes 2 and 3, respectively, for gas (in the upper part of chamber 1) and for liquid (in the lower part of chamber 1), cyclone 4 and reflectors 5 of fluid flow (drilling mud) located inside the working chamber 1 .

The working chamber 1 is equipped with an airtight cover 6. A cyclone 4 is suspended from the bottom to the cover 6 along the axis of the camera 1 (and, accordingly, the cover 6). The degassed drilling fluid is fed into the cyclone 4 through the inlet 7 connected to the cyclone body 4 tangentially

Cyclone 4 is made in the form of a cylindrical body, passing below into a cone 8, provided at the bottom with a vertical-slotted separator 9. Separator 9 are vertical windows made in the wall of the cone 8

Outside the separator 9 is installed circular extinguisher 10 thread with windows 11 at the top.

In the upper part of the cyclone 4, additional windows 12 are made located above the inlet pipe 7 and serve to prevent liquid overflow during unsteady (pulsating) outflow through the discharge pipe 2. The number and total area of the overflow windows 12 are selected so that all excess fluid volume (mainly aerated drilling mud) managed to test inside the chamber 1 if the cross-section of the overflow window is not less than 0.25 of the cross-sectional area of the horizontal part of the cyclone 4 (above the cone 8). then the liquid has time to exit completely through the windows 12 and does not enter the outflow pipe 2 for gas. It is advisable to install a means of blocking the outlet pipe 2, since this additionally prevents the liquid from overflowing through the pipe 2 This tool can be made in the form of a float blocking the pipe 2 when liquid enters it

For removal of the separated gas from the cyclone 4 serves as an outlet nozzle 2 (it is also an outlet pipe for evacuating the gas from the working chamber 1) The bottom of the pipe 2 is installed below the plane of the inlet nozzle 7;

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The pipe 2 is perforated along the entire length inside the cyclone 4.

Below the cyclone 4, multi-light mesh reflectors 5 are installed, overlapping the cross section (almost completely) of the working chamber 1. At the same time, the mesh reflectors 5 of all the runes are set obliquely and so that the lower end of the upper tusk is installed above the upper end of the underlying rus. The reflectors 5 have partitions 13 installed in the lower part of the runes and forming windows 14 with the inner wall of the working chamber 1 for the passage of gas released from the drilling mud.

The working chamber 1 is equipped with an additional pipe 15 for removal of gas emitted from the drilling fluid when passing through the reflectors 5 (to the atmosphere or to the flare).

The degasser works as follows.

The aerated liquid from the bindings of the outgrowth equipment under the pressure of reservoir energy through the inlet 7 enters the cyclone 4 in which the gas separates from the drilling fluid under the action of centrifugal forces and is discharged through the pipe 2 to the α atmosphere (or to the plume in the presence of hydrogen sulfide), degassed the liquid flows along the cyclone sgenec 4. The liquid spun in the cyclone body 4 in the cone 8 rushes into the guide windows (vertical) of the separator 9 and leaves them in the horizontal direction before meeting the conical wall d (barrier) of the circular flow 10 quencher. Here, the liquid changes its direction once more and flows partly into the oasive sides in the form of splashes and partly down the inner wall of the circular extinguisher 10. All this contributes to the further degassing of the flow of liquid. The gas that has separated out at the same time leaves through windows 11 upwards.

A fully or partially degassed drilling fluid from a cyclone and circular extinguisher 10 is discharged into a multi-light reflector 5 of the stream. When the drilling device flows down through the reticulated multi-colored reflector 5, a supplemental degassing occurs. Due to the inclined arrangement of the grids of the reflector 5, the fluid flows over the entire area of all grids. Ego leads

to a significant increase in this area. And since the solution flows through the grids at the same time through the grids (holes) of the grid, this leads to

a significant increase in the area of passage of fluid (drilling mud) through the grid. As a result of such an increase in the seepage surface, the degassing effect increases.

The gas released at the same time rises, slides upward along the inclined grid upwards and through the annular windows 14 enters the upper part of the working chamber 1 and then through the Additional pipe 15 into the atmosphere or

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The proposed degasser ensures high efficiency of degassing of drilling fluids due to the joint use of the cyclone separation method with mechanical phase separation (liquid and gas), has a wide range of applications: from low-viscosity drilling fluids to highly viscous regardless of the specific gravity of the fluid, and is also characterized by reliability work and simplicity of design.

Claims (2)

1. A degasser containing a working chamber with branch pipes, in which a cyclone with an inlet pipe and flow reflectors are installed, characterized in that, in order to increase efficiency during unsteady operation, the degasser is equipped with a vertical-slotted separator installed in the lower part of the cyclone, a circular flow quencher with windows at the top, mounted outside the separator, the cyclone is made with additional windows in the upper part located above the inlet manifold, and the working chamber is equipped with an additional pipe for gas outlet. 2. Decontaminator according to claim 1, characterized in that the flow reflectors are made in the form of multi-colored mesh elements installed obliquely, while the lower end of the upper tier is installed above the upper end of the underlying trench, and between the reflectors and the wall of the working chamber are windows for the passage of gas. # eleven L Fk