RU2521580C1 - Filter for mud cleaning - Google Patents

Abstract

FIELD: oil and gas industry.

SUBSTANCE: filter for mud cleaning includes a body with mud inlet tubes and cleaned mud outlet tubes, a filtering element for solution treatment. The inlet and outlet tubes with maximum possible diameter are installed coaxially. The body is equipped with a sealed cover for installation of the filtering element made as a cassette with parallel rods, which are used as support for zigzag installation of the filter screen. On the opposite side of the cover in the body there is a sealed chamber with heat medium inlet and outlet tubes.

EFFECT: reliability of design, minimum hydraulic resistance, and year-round operation.

2 dwg

Description

The proposal relates to well drilling, in particular to devices for cleaning the drilling fluid from filler (cord fiber, hive) in the suction line of mud pumps when drilling wells using downhole motors.

A known filter (RF patent No. 2254900, IPC B01D 27/06, published in Bulletin No. 18 of June 27, 2005) containing a filtering part made in the form of at least one cylinder from a longitudinally corrugated metal mesh covering a cylindrical perforated frame, and connecting nodes mounted on the ends of the cylinder from a metal mesh and a cylindrical perforated frame, and the resource-optimal number of corrugations of a cylinder from a metal mesh is determined by the ratio

n _opt = π / 4d / δ (1 + k ₁ · D / d) · k ₂ ,

where n _opt is the optimal number of corrugations of the cylinder from a metal mesh;

d, D are the diameters of the circles of the male and female corrugations of the cylinder made of metal mesh, respectively;

δ is the total thickness of the metal mesh of the filtering part;

k ₁ - density coefficient of laying corrugations, taken equal to k ₁ = 0.1 / 0.3;

k ₂ - filter regeneration efficiency coefficient, taken equal to k ₂ = 0.5 / l.

The disadvantages of this filter are:

- pressure loss due to a change in flow direction by 90 °;

- a small filtration area due to the use of a cylindrical perforated frame along the central axis of the filter and, as a result, low throughput and the need for frequent cleaning of the filter (for example, from cord fiber);

- the inability to work at subzero ambient temperatures, since the filter is not heated.

The closest in technical essence and the achieved result is a device for cleaning solutions (RF patent No. 2027472, IPC 6 B01D 33/39, publ. In bull. No. 3 from 01/27/1995), containing a housing with a nozzle for the input of the solution to be cleaned, a nozzle gas outlet in the upper part of the casing and pipes for removing the purified solution and sludge located in the lower part of the casing, a filter element, a screw with a drive for spreading the solution, a flap valve with a spring, and the device is equipped with a glass with a screw placed in it, an additional rough filter cleaning in the form of a slotted sieve from a trapezoidal wire rigidly connected to the impeller for crushing sludge and a screw, while the coarse filter is equipped with ribs for uniformly supplying the solution to the filter element equipped with ribs for degassing the solution and made of trapezoidal wire with smaller sizes of gaps in comparison with a coarse filter, and for compaction and discharge of sludge, a glass is placed in the lower part of the housing, the screw of which is fixed coaxially with the coarse filter by means of a cross.

The disadvantages of this device are:

- the complexity of the design and the presence of a mechanical drive and, as a consequence, the high costs of its manufacture and maintenance;

- fast clogging when a filler, such as a cord fiber, enters the fine filter sieve, since the cord fiber, due to its low mass, does not settle at the bottom of the housing;

- non-removable filter element, which makes it difficult, if necessary, to replace and clean it;

- the inability to work at sub-zero ambient temperatures, since the device is not heated.

The technical task of the invention is the creation of a reliable, efficient filter design with minimal hydraulic resistance, the ability to quickly replace the filter elements and year-round operation to clean the drilling fluid from filler (cord fiber, hive) in the suction line of the mud pumps when drilling wells using downhole motors.

The technical problem is solved by a filter for cleaning the drilling fluid, including a housing with nozzles for entering the drilling fluid and the output of the purified fluid, a filter element for cleaning the fluid.

What is new is that the input and output nozzles are installed coaxially and made of the largest possible diameter, and the housing is equipped with a sealed cover for installing a filter element, which is made in the form of a cartridge with parallel rods, with which a filter mesh is installed in a zigzag fashion, with the opposite side of the cover in a sealed chamber is made with a body of inlet and outlet coolant.

Figure 1 shows a filter for cleaning drilling fluid in section.

Figure 2 shows a cross section of a filter.

The filter for cleaning the drilling fluid consists of a housing 1 (Fig. 1) with nozzles for introducing the drilling fluid 2 (Fig. 2) and the outlet of the purified mud 3 made of the maximum possible diameter in order to reduce the resistance at the inlet and outlet of the filtering element 4 for cleaning the mud . At the same time, the inlet 2 and outlet 3 nozzles are installed coaxially and made of the largest possible diameter, and the case is equipped with a cover 6, sealed due to the gasket 5 (Fig. 1), pressed against the case 1 (for example, by screw 7 when screwing it into nut 8 or using a threaded connection of the cover 6 with the housing 1 (not shown in FIG.) or the like). The nut 8 is rigidly fixed in the eyes 9 of the housing 1 with the help of pins 10.

The housing 1 in the lower part is equipped with a sealed chamber 11 formed by the bottoms 12, 13 and communicated with the fittings 14, 15 for supplying and leaving the heat carrier (for example, steam) through the openings 16, 17 in the housing 1.

A filter element 4 (FIG. 2) is placed in the housing 1 for cleaning the solution, which is made in the form of a cartridge 18 (FIG. 1) with parallel rods 19, the lower part of which is fixed in the lower base 20 (for example, by threading or welding), and the upper part is fastened with nuts 21 to the upper base 22. On the rods 19 a filter mesh 23 is installed in a zigzag fashion (FIG. 2), the edges of which are tightly pressed against the bases 20 (FIG. 1) and 22.

The zigzag arrangement of the filter mesh 23 allows you to increase the filtration area by more than 2.5 times. To remove the cartridge 18 from the housing 1, the upper base 22 is provided with a handle 24.

The filter for cleaning drilling mud works as follows.

The housing 1 is mounted in the suction line of the mud pumps (not shown in FIG.) Using the mud inlet 2 nozzles (FIG. 2) and the purified mud outlet 3. Then the cartridge 18 is assembled (FIG. 1). To do this, fix the rods 19 on the lower base 20, install a zigzag filter mesh 23 on top of them (Fig. 2) (the mesh sizes are selected empirically), put on top of the rods 19 (Fig. 1) the upper base 22 and nuts 21, evenly screwing them onto the rods 19, press it to the upper end of the mesh 23 (figure 2) until the gaps above and below the mesh 23 disappear.

A cassette 18 is placed in the housing 1 (Fig. 1), closed with a cover 6 with a gasket 5, a nut 8 with pins 10 is installed in the eyes 9. A screw 7 is screwed into the nut 8 until it stops in the cover 6, pressing the cover 6 tightly through the gasket 5 to case 1.

When you turn on the mud pumps (not shown in Fig.), The drilling fluid with the filler passes through the inlet of the drilling fluid 2 (FIG. 2), zigzags of the filter mesh 23 of the cartridge 18 (FIG. 1) and through the outlet of the purified mud 3 (FIG. 2) ) enters the mud pumps, while the filler particles settle on the surface of the filter mesh 23.

With a complete clogging of the filter mesh 23, the cartridge 18 (Fig. 1) is removed from the housing 1 by the handle 24, disassembled and cleaned. To do this, unscrew the nuts 21 of the rods 19, remove the upper base 22 and remove the mesh 23 (figure 2). All parts of the filter element 4 (figure 2) are washed under running water. At the time of cleaning the clogged filter element 4, a spare cartridge 18 is installed (not shown in FIG.), Which greatly simplifies maintenance and reduces downtime.

In order to prevent freezing of drilling fluid residues at negative ambient temperatures, a coolant, such as steam, is supplied (and discharged) through the fittings 14, 15 and openings 16, 17 in the housing 1 through the fittings 14, 15 and the openings 16, 17.

The advantage of the proposed filter for cleaning drilling fluid is that its design, thanks to replaceable filter cartridges, allows you to quickly recharge the filter, and the zigzag arrangement of the filter mesh significantly increases the filtration area and, accordingly, the service interval for replacing the filter cartridges. In addition, thanks to a sealed heat chamber under the filter bottom, unauthorized downtime due to freezing of the drilling fluid is eliminated.

Claims (1)

A filter for cleaning the drilling fluid, comprising a housing with nozzles for introducing the drilling fluid and outlet of the purified fluid, a filter element for cleaning the mud, characterized in that the nozzles of the inlet and outlet are installed coaxially and are made of the largest possible diameter, and the housing is equipped with a sealed cover for installing the filter element, which is made in the form of a cartridge with parallel rods, with the help of which a filter mesh is installed in a zigzag manner, and on the opposite side of the lid in the case there is a hermet ung camera with nozzles coolant input and output.

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