RU2314150C1 - Foam generator - Google Patents

Abstract

FIELD: foam generators used at drilling wells while carrying out geological exploration works and engineering-geological surveying.

SUBSTANCE: foam generator includes housing where foaming member is arranged, ducts for supplying fluid and discharging foam. Housing of foam generator is secured to drilling column just over rock destructing tool. Foaming member is in the form of hollow cylinder of woven synthetic fibers with fiber weaving density increased from inner surface of said cylinder to its outlet surface. Water mechanically cleaning filter may be used as foaming member, possibly in the form of cartridge SL10 for mechanically cleaning water.

EFFECT: simplified design, improved operational characteristics of foam generator, lowered expenses for drilling wells.

2 dwg

Description

The invention relates to foam generators used in the drilling of shallow wells during exploration and engineering geological surveys.

Known foam generator (RF patent No. 2054312, IPC 6 B01F 5/04, 1996), containing a housing with nozzles for the input of the ejected and working environments, as well as the removal of the mixture. A cylindrical insert with a built-in ejector insert is installed inside the body to form a fluid flow. The cavity of the cylindrical insert is in communication with the annular chamber and the tangential pipe using holes made in the walls of the insert. Holes are made in the diffuser of the ejector insert. At the exit of the foam chamber, nets with balls placed on them are fixed. The balls are made of magnetic ferrite material, and the body and ejector insert are made of non-magnetic material. To obtain smaller bubbles of foam due to cavitation processes in the body of the balls there are holes. The disadvantage of this device is the complexity, as well as low performance.

Known foam generator (RF patent No. 2192919, IPC 7 B01F 3/04, 2002), containing a hydraulic pump, compressor, nozzle, channels connecting these elements, a mixing chamber, foam-generating mesh, dispersion chamber. The channels connecting the nozzle to the pump and compressor contain shut-off valves, check valves, liquid and gas dispensers, and discharge pipes with valves, in addition, there is a pipe with a valve connecting the compressor to the pump, and the dispersion chamber is removable, with the possibility of replacement her to another or work without a dispersion chamber. The disadvantage of this device is the low performance.

Known foam generator adopted for the prototype (RF patent No. 2227063, IPC 7 B01F 5/06, 2004), containing a housing in which there is a foaming element, medium inlet pipes, one of which is placed along the axis of the housing, and the other on it lateral surface, and foam branch pipe. The foaming element is made in the form of a perforated membrane and blades mounted on the drive shaft with the possibility of sliding on the surface of the membrane. The technical result consists in the possibility of obtaining monodisperse foam with an estimated bubble size at a given foam ratio. The disadvantage of this device is the complexity, as well as low performance.

The technical result of the invention is to simplify the design of the device, as well as improving operational characteristics.

The technical result is achieved in that a foam generator for a drilling installation, comprising a housing in which a foaming element is located, channels for introducing a medium and outputting foam, according to the invention, the foam generator housing is mounted on a drill string directly above the rock cutting tool, and the foam forming element is made in the form of a hollow cylinder from woven synthetic fibers with increasing fiber plexus density from the inner surface of the cylinder to the outer.

The use of the proposed device in comparison with the prototype allows us to simplify the design of the device and the technology of drilling shallow wells with cleaning the bottom of the foam, thereby improving performance.

The proposed foam generator is illustrated by drawings, where figure 1 shows a General view of the device, figure 2 shows a section along the line BB, where:

1 - foam generator body;

2, 3 - adapters;

4 - foaming element;

5 - locking crosspiece;

6 - channel input foaming mixture;

7 - channel output foam;

8 - rock cutting tool;

9 - drill string.

The foam generator is mounted on the drill string 9 using the upper adapter 2 having a channel for introducing a foaming mixture 6. The rock-breaking tool 8 is connected to the foam generator with an adapter 3 having a channel for removing foam 7. The foam generator consists of a housing 1 in the form of a pipe located between two adapters 2 and 3, a foaming element 4, which is a hollow cylinder of woven synthetic fibers with an increasing density of fiber weave from the inner surface of the cylinder to the outer, centered blocking 5 th crosspiece.

The foam generator operates as follows. When drilling rocks, the drill string 9 rotates together with the rock cutting tool 8 and the foam generator, while a foaming mixture is fed through the interior of the drill string. The foaming mixture passes through the inlet channel 6, falling into the longitudinal channel of the foaming element 4. Then the foaming mixture seeps through the material of the foaming element, made of a plurality of synthetic fibers, acting as a dispersion chamber, where the foaming mixture actively forms foam. The formed foam passes through the space between the housing 1 and the locking cross 5, then through the foam outlet channel 7 it enters the washing channels of the rock cutting tool.

The foaming element is represented by the filtering material of the SL10 "Geyser" mechanical water purification cartridge, made with a varying density of fiber plexus from the inner surface to the outer. In this modification, the porosity of the filter material varies from 10 μm to 5 μm, which allows finer purification of running water from In the proposed device of the foam generator, this scheme of the filter element allows foam bubbles to be constantly divided into several other, smaller ones, which Will get the output fine foam. The fine foam has a relatively high thermal capacity, due to low multiplicity foam, which considerably influences the thermal properties of the foam, which play an important role in the nature of convective heat cutter tool.

Patency (600 l / h) and service life (50 m ³ ) of the proposed model of the filter element satisfy the conditions of foaming and cost-effective replacement after the end of the resource of his work.

The use of the proposed foam generator for drilling shallow wells allows the use of rapidly decaying foam formed by a low concentration of foaming substances in the water-air mixture, without using a device for breaking the spent foam. It also allows more efficient use of the life span of the foam, eliminating the change in its properties after the route along the entire length of the drill string from the surface to the rock cutting tool.

The use of a foam generator provides the following advantages:

- simplification of the design of the device;

- increase in operational characteristics;

- reducing the cost of drilling wells.

Claims (1)

Foam generator for a drilling installation, comprising a housing in which a foaming element is located, channels for introducing a medium and outputting foam, characterized in that the foam generator housing is mounted on a drill string directly above the rock cutting tool, and the foaming element is made in the form of a hollow cylinder of woven synthetic fibers with increasing density of fiber plexus from the inner surface of the cylinder to the outer.

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