RU2016186C1 - Bypass filter - Google Patents

Abstract

FIELD: oil producing industry; wash conditioning during downhole hydraulic motor drilling. SUBSTANCE: filter pipe 2 and guide pipe 3 are mounted in filter body 1. Shear pin 9 fixes telescopic coupling of filter pipe 2 and guide pipe 3. The free end of filter pipe 2 is provided with a stop member 10 to conduct drilling string vibrations to filter pipe 2 and to clean filter perforations of cuttings. Filter pipe 2 and guide pipe 3 have different number of inlet perforations. EFFECT: enlarged operating capabilities. 3 cl, 2 dwg

Description

 The invention relates to techniques for drilling wells, in particular to means for cleaning flushing fluid, for example, when drilling with downhole motors.

 Known filters for cleaning drilling fluid from impurities (sludge, scale, metal shavings, rubber particles) installed in the layout of the drill string (1).

 These filters have a common drawback - the possibility of stopping the circulation of the washing fluid when filling the cavities with sludge. This leads to a premature termination of the drilling process, that is, to underperforming the bit.

 A device for filtering washing liquid (2) is known, which is more perfect in comparison with the above analogues and can be taken as a prototype of the proposed solution.

 In the prototype, the cuttings are separated by size, the vibration of the drill string is used to clean the filter holes and for a more compact laying of cuttings in prefabricated cavities. However, in the prototype there was still the possibility of prematurely stopping the circulation of the washing fluid from filling with sludge, which would lead to a bit malfunction.

 The aim of the invention is the elimination of premature termination of the drilling process from filling the filter with sludge.

 This goal is achieved by the fact that in the filter with a bypass device containing a housing, a filter pipe and a ring, a filter pipe and a guide pipe of the bypass device are connected telescopically and fixed with a shear pin. The filter and guide pipes have bypass holes, and their number differs by one. A contact is installed on the free end of the filter pipe to transfer vibration from the housing to the filter pipe.

 The presence of a telescopic connection of the filter and guide pipe allows you to combine the bypass holes after cutting the pin from filling sludge-receiving cavities.

 A different number of bypass holes in the filter and guide pipes provides a guaranteed flow area for flushing fluid, regardless of the relative position of the pipes after the telescopic joint is moved.

 The contact for transmitting vibration from the housing to the filter pipe allows you to clean the filtering holes from the retained sludge, which makes it possible to more compactly lay the sludge in prefabricated cavities. The latter increases the time for cleaning the washing liquid from sludge, as a result of which the working conditions of the downhole motor and bit are improved.

 The above confirms the usefulness of the proposed filter.

 Comparison of the proposed solution with analogues, prototype and other known solutions carried out in the course of patent information research did not reveal the signs that distinguish the proposed solution from the prototype, which allows us to conclude that its criteria are “novelty” and “significant differences”.

 In FIG. 1 shows a filter with a bypass device, in section, according to two schemes; in FIG. 1, a is a diagram of a device for separating sludge during the passage of washing liquid through a filter pipe, and then into the cavity between the housing and the filter pipe; in FIG. 1, b is a diagram of a device for separating sludge during the passage of washing liquid from the cavity between the housing and the filter pipe into the filter pipe; in FIG. 2 shows the process of passing the washing liquid after filling the filter with sludge and cutting off the locking pin, respectively, according to the scheme "a" and "b".

 The filter with a bypass device consists of a housing 1, a filter pipe 2, a guide pipe 3 and a ring 4. Bypass holes 5 are made in the filter pipe 2, and holes 6 are made in the guide pipe 3. Holes 7 are made in the filter pipe 2 to separate the sludge, which can be round or slit-like. Plugs 8 are installed in the filter pipe (Fig. 1, 2, a) and the guide pipe (Fig. 1, 2, b). A shear pin 9 fixes the telescopic connection of the filter pipe 2 and the guide pipe 3. A contact is established on the free end of the filter pipe 2 10. Ring 4 is installed in the threaded connection 11 of the housing 1. The upper and lower threaded connections of the housing 1 for installing the filter in the layout of the tool are not shown. There is a ring 12 for installing and removing pipes 2, 3.

 The filter with the bypass device operates as follows.

 The filter is installed in the layout of the tool above the downhole motor, but can be put in other connections, for example, under the square. When drilling, the sludge 13 enters the filter pipe 2 (Fig. 2, a) or in the cavity between the housing 1 and the filter pipe 2 (Fig. 2, b). Contact 10 transfers vibration from the drill string through the housing 1 to the filter pipe 2, as a result of which the sludge 13 from the filter holes 7 is easily separated and compactly placed in the collection cavities. The latter increases the cleaning time of the flushing fluid, which favorably affects the operation of the downhole motor and the bit.

 When the filter is filled with slurry 13 (Fig. 2, a, b), the pressure in the pipes increases and pin 9 is cut off. The filter pipe 2 is lowered in the guide pipe 3 (Fig. 2, a) or the guide pipe 3 is lowered in the filter pipe 2 (Fig. 2b). The bypass holes 5 and 6 are combined, the flushing fluid freely passes to the downhole motor and the bit. The drilling process is carried out without a premature stop.

 The implementation of the bypass holes 5 and 6 in different quantities in the filter pipe 2 and the guide pipe 3 provides a normal passage of fluid with any mutual radial arrangement of these pipes.

 In the proposed filter with a bypass device compared with the prototype has the following advantage. The possibility of bypassing the washing liquid after filling the filter with sludge allows you to bring each flight to the end, that is, to fully operate the bit. In this case, the end of the flight will be without cleaning the liquid.

 A different number of bypass holes in the filter and guide pipes guarantees the passage of fluid for any mutual placement of the pipes after the pin is cut and the telescopic joint is moved.

 The transmission of the vibration of the drill pipe string to the free (not fixed) end of the filter pipe ensures that the filter holes are cleaned of the retained sludge and compactly packed in prefabricated cavities. As a result of this, the possible cleaning time is increased, that is, the operating conditions of the engine and the bit are improved.

 As a result of applying a filter with a bypass device, incomplete flights disappear and penetration to the bit increases. The guarantee against incomplete flights allows drillers to drill only with the installation of a filter tool in the layout, which eliminates the clogging of downhole motors and increases their overhaul period.

Claims (3)

 1. FILTER WITH RELEASE UNIT, containing coaxially mounted guide pipe with inlet openings and a filter pipe with filter holes, a ring for closing the passage between the inner surface of the housing and the outer surface of the filter pipe, and a plug for forming a sludge receiving zone, characterized in that, in order to prevent premature termination of the drilling process from filling the filter with sludge, it is equipped with a fixing element, made in the form of a shear pin, in the filter th tube made inlets, the guide tube and filter shear pin are fixed in the rest position and mounted for axial movement relative position and alignment of their inlet openings after the destruction of the shear element.  2. The filter according to claim 1, characterized in that the number of inlets in the filter and guide pipes is different and differs by one.  3. The filter according to claim 1, characterized in that it is equipped with a stop mounted on the free end of the filter pipe with the possibility of interaction with the inner surface of the housing to transmit vibration from the latter to the filter pipe.

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