SU904367A1 - Apparatus for preparing drilling mud - Google Patents

Description

The invention relates to a device for preparing a drilling fluid in the drilling of oil and gas wells in and at the same time degassing it and can be used in the chemical, food and other industries.

The manufacture of drilling fluids in field conditions is based on the dispersion of solid materials in the fluid by mechanical or hydraulic agitation. The rate of preparation of drilling fluids depends on the intensity of mixing and interaction with the solid components. The presence of gaseous components significantly impairs the nature of this interaction. The negative effect of air on the preparation of solutions is most pronounced when using fine powder materials (clays, iron, chemicals). In the present application system, the preparation of drilling fluids is prepared by mixing in the ejector blender a liquid with a mixture of powder and air coming through the pneumatic transport system. 3 The large air content makes it practically impossible not only to disperse, but also to homogenize the suspension. When circulating such a suspension in the washing system, the structural and mechanical properties of the solution constantly change, which leads to various kinds of complications.

It is also known a device for the preparation of drilling fluid, containing hydrocyclones with inlet and outlet nozzles and means for feeding the raw material C2J

In this device, hydrocyclones are used for the final mixing of the solution components.

However, the use of a hydrocyclone does not provide degassing, since the light fraction is mixed at the outlet with the total mass of the solution, homogenization is not ensured, because the separation of fractions due to centrifugal forces does not cause active mixing of the components. As a result, the quality of the drilling mud is reduced.

The aim of the invention is to improve the quality of the reactor.

This goal is achieved by the fact that hydrocyclones are installed eccentrically one in the other, and the input patches are combined into a common collector. Internal hydrocyclone made with a cut on the conical part.

FIG. 1 shows a device, a vertical section; in FIG. 2 - the same, - horizontal section.

The device contains external 1 and internal 2 hydrocyclones, which are inserted eccentrically one into another.

Hydrocyclones have inlet nozzles 3 and 4, respectively, which are combined into a common collector 5, which connects them with means for supplying the source material or the initial mixture (not shown K) The outer hydrocyclone has outlet nozzles 6 and 7, the first for draining the finished solution, the second for gas outlet. -Internal hydrocyclone is made with a cut 8 on the conical part and has a pipe 9 for the gas outlet.

The device works as follows.

From the means for feeding the source material by the pneumatic transport system, a mixture of powder, liquid and air enters under pressure into the collector 5, where it is divided into two streams,

5 entering into hydrocyclones 1 and 2 through nozzles 3 and 4, the separation of the total flow into several parts contributes to a more complete gas separation and a higher degree of homogenization.

In hydrocyclones, the mixture flows are swirling and spiraling downward. In the conical part, the flow velocity rises sharply. Due to centrifugal forces. The mixture is divided into fractions and particles collide. The air is then separated and exhausted through the pipes 7 and 9, and the liquid with solid particles moves against the wall. In slice 3, the stream swirled in hydrocyclone 2 escapes and collides with a stream moving at high speed down in hydrocyclone 1; cut 8 contributes. the collision of flows over a large length of the conical part of a hydrocyclone 1. As a result of the collision of flows and the friction of particles against the walls of hydrocyclones, intensive mixing and dispersion of the solid phase of the solution occurs. This is also facilitated by degassing, which increases the wettability of the particles and their interaction with the liquid.

The finished solution is discharged through the nozzle. B.

The device provides higher quality solutions due to the separation of gas and the subsequent intensive mixing of the mixture and dispersion of the solid phase.

Claims (2)

(57) 1. A DEVICE FOR PREPARING A DRILLING MIXTURE containing hydrocyclones with inlet and outlet nozzles and a means for supplying raw material, characterized in that, in order to improve the quality of the solution, the hydrocyclones are mounted eccentrically in one another, and the inlet nozzles are combined into a common collector . 2. The device according to π. 1, characterized in that the internal hydrocyclone is made with a cut on the conical part.