Submersible inhibitor reagent metering device

Abstract

The utility model relates to the field of devices for protecting downhole pumping equipment and oilfield surface equipment against the deposition of scale, asphaltenes, resins and paraffins, the formation of high-viscosity emulsions in produced fluid, and corrosion. The present device comprises lower discs and upper discs which are detachably interconnected by bracing elements. The lower discs are configured in the form of metering discs and a support disc, and the upper discs are support discs. Arranged between the lower discs and between the upper discs are replaceable sealing gaskets, and the lower discs and sealing gaskets contain a perforation in which a replaceable filter element is disposed. The technical result is an increase in the service life of a metering device.

Description

[0001] IMMERSION DISPENSER OF REAGENT-INHIBITOR

[0002] DESCRIPTION

[0003] The field of technology to which the utility model belongs

[0004] The utility model relates to the field of devices for protecting deep-well pumping equipment (DPE) of production and injection wells and surface oilfield equipment (SOE) from operational complications such as the formation of salt deposits, deposits of asphalt, resin, and paraffin substances, the formation of highly viscous emulsions in the produced liquid, and corrosion on DPE and SOE using chemical agents, in particular to submersible dispensers of reagents (inhibitors) (E21B37 / OO, E21B37 / O6).

[0005] State of the art

[0006] A submersible container, RU 198809U1, published July 29, 2020, is known from the prior art. It is characterized in that the submersible container comprises a lower and an upper disk, each having a section with an external thread, detachably connected to each other via a fastening element by means of a threaded connection, and a fiberglass body enclosed between the lower and upper disks with metering holes formed in the wall.

[0007] A disadvantage of this alternative is that the perforated fiberglass body serves as the thrust element. When lowered into the well, the container experiences significant vertical loads. Therefore, with repeated use, the container may fail prematurely due to the presence of weak points in the structure, such as the holes. Fiberglass is also a fibrous material, and drilling holes can lead to fiber delamination and uneven distribution of the vertical load, which also leads to premature failure of the container.

[0008] Also known from the prior art is a SUBMERSIBLE WELL CONTAINER FOR FEEDING A REAGENT INTO A WELL, RU 197769U1, published 05 / 28 / 2020, characterized in that the submersible well container for feeding a solid reagent, mainly in granular or tablet form, into a well, includes sections connected to each other by means of a coupling connection, each of which consists of a tubular body and a dispenser with a reagent placed inside it and not secured, installed in the body with the formation of a gap between its outer walls and the inner surface of the body, wherein the dispenser is made with both blind ends and is perforated in the radial direction;the lower part of the section housing is provided with a fixing bolt that prevents the dispenser from falling out of the housing when the section is positioned vertically, while simultaneously eliminating its influence on the free movement of the dispenser inside the housing under the action of the movement of the formation fluid or with a different spatial arrangement of the housing; wherein the lower end of the lower section of the container is provided with a lower disk with perforations, characterized in that the section housing is made perforated, and the section housing in the upper part, above the perforations of the housing, is additionally provided with a fixing bolt secured in the wall of the housing, wherein the distance between the fixing bolts in the housing exceeds the length of the dispenser.

[0009] A disadvantage of this alternative is that the device allows for free movement of the dispenser within a limited section, leading to collisions between the section body and the container during insertion and extraction, as well as during formation fluid movement. Constant collisions lead to increased wear on the dispenser and premature failure.

[0010] As a prototype, the applicant considers a DEVICE FOR FEEDING A REAGENT INTO A WELL, RU 2472922 C1, published on 20.01.2013, characterized in that the device for feeding a reagent into a well contains cylindrical containers with a reagent connected at the ends by means of couplings, mixing chambers with openings and filter-dispensers, distinguished in that the upper ends of the cylindrical containers are covered by a perforated disk with a filter element, and the lower ends by a non-perforated disk, wherein the couplings have at least one row of inlet and outlet openings.

[0011] A disadvantage of the prototype is that the metering holes are located on the side walls of the device, which leads to the fact that when the container is immersed or removed, as well as when the formation fluid moves, the load is completely absorbed by the end caps, which transfer it through the housing to the supporting element made in the form of a threaded coupling, as a result of which the threaded connection is subject to wear and premature failure.

[0012] Disclosure of the essence of the utility model

[0013] The technical problem that the claimed utility model is aimed at solving is the elimination of the prototype’s deficiencies.

[0014] The claimed utility model is a submersible reagent (inhibitor) dispenser containing lower and upper disks, detachably connected to each other through thrust elements, wherein the lower disks contain perforations in which a replaceable filter element is installed, and between the lower and upper disks there are replaceable sealing gaskets.

[0015] In a particular case, the immersion reagent (inhibitor) dispenser is designed with the ability to dispense solid and liquid reagent.

[0016] In this particular case, the lower and upper discs are made of sheet metal.

[0017] In this particular case, the lower and upper discs are made of synthetic material.

[0018] In a particular case, the thrust elements are made in the form of bushings.

[0019] In a particular case, the thrust elements are made in the form of plates.

[0020] In a particular case, the thrust elements are made of metal.

[0021] In a particular case, the perforation cross-section is determined based on the properties of the inhibitor and the operating parameters of the well or NNO.

[0022] In a particular case, the filter element is made of filter material.

[0023] In this particular case, the sealing gasket is made of moisture-resistant, oil-resistant, and heat-resistant material.

[0024] The said utility model provides a solution to the said technical problem and provides a technical result consisting of increasing the service life of the reagent (inhibitor) dispenser.

[0025] According to GOST 27.002-2015 "Reliability in Engineering. Terms and Definitions":

[0026] The resource is the total operating time of an object from the beginning of its operation or its resumption after repair until the moment the limit state is reached.

[0027] The ultimate limit state of a component is the state at which it no longer meets operational requirements, undergoes unacceptable deformation, and cannot be repaired, requiring complete replacement. Brief description of the drawings

[0028] Fig. 1. General view of a device for feeding a reagent into a well containing the claimed submersible reagent (inhibitor) dispensers.

[0029] Fig. 2. Immersion dispenser of reagent (inhibitor) with thrust bushings and double upper thrust disk with gasket.

[0030] Fig. 3. Immersion dispenser of reagent (inhibitor) with thrust plates and a single upper thrust disk.

[0031] Fig. 4. Immersion dispenser of reagent (inhibitor) with thrust bushings and triple upper thrust disk with gaskets.

[0032] The following are indicated on the figures: 1 - body; 2 - coupling; 3 - thread; 4 - dispenser; 5 - fixing bolts; 6 - metering holes; 7 - space for placing the reagent (inhibitor); 8 - lower metering disk; 9 - tightening bolts; 10 - upper metering disk; 11 - sealing gasket; 12 - filter element; 13 - lower thrust disk; 14 - upper thrust disk; 15 - thrust plates; 16 - thrust bushings; 17 - dispenser chamber; 18 - nuts.

[0033] The submersible reagent (inhibitor) dispenser 4 is part of a device for feeding a reagent into a well (Fig. 1) or the intra-tube space of a wellhead system, which includes a body 1 of a cylindrical container made in the form of a section of a pump-compressor pipe, at both ends of which a coupling 2 is mounted on a thread 3 or a sealed metal plug (not shown in the figures).

[0034] One or more dispensers 4 are mounted in the housing 1 and are secured from displacement by means of bolts 5 mounted in the dosing holes 6. In the space for placing the reagent (inhibitor) 7, formed by the dosing devices 4 (or the dosing device and the plug) and the walls of the housing 1, a liquid or solid reagent (inhibitor) is located.

[0035] The dispenser 4 is used for dosing the reagent (inhibitor) contained in the housing 1 into the well in order to protect the equipment from the formation of salt deposits, deposits of asphalt, resin, paraffin substances, the formation of highly viscous emulsions in the produced liquid and corrosion on the GNO and NNO. The dispenser 4 contains several lower disks, including a lower dosing disk 8 containing four square openings along the perimeter for tightening bolts 9 with square heads, an upper dosing disk 10, the holes for the bolts 9 in which are made round, sealing gaskets 11, filter elements 12 and a lower thrust disk 13. The lower disks, between which the sealing gaskets 11 are enclosed, are detachably connected to the upper thrust disk 14 by means of bolts 9 through thrust elements 16 or 17. Thrust elements are detachably mounted between the lower and upper disks (Fig. 2).

[0036] Connecting the lower and upper disks via thrust elements allows for maximum tightening without damaging any of the device components, thereby securing the dispenser 4 within the housing 1. This prevents movement of the dispenser 4 within the housing 1, preventing wear of the sealing gaskets 11, and preventing collisions between the dispenser 4 and the housing 1. This, in turn, prevents premature failure and extends the service life of the device. Furthermore, the detachable connection allows for complete disassembly of the device, allowing for replacement of each component, as well as cleaning of the filter element if necessary, which ultimately extends the service life of the device and, consequently, its service life.

[0037] Sealing gaskets 11 are mounted between the lower disks. The lower disks and sealing gaskets 11 are perforated accordingly, housing filter elements 12. The perforation is preferably performed in the form of a central hole. The cross-sectional area of ​​the perforation is selected based on the properties of the selected reagent (inhibitor) and the operating parameters of the well or NNO.

[0038] The sealing gasket 11 allows the dispenser 4 to be hermetically and securely fastened in the housing 1 of the cylindrical container, which prevents it from moving inside the housing 1 and colliding with it, which extends the service life and, accordingly, the resource of the dispenser 4.

[0039] Perforation can be accomplished by multiple holes randomly distributed across the disk's surface, with multiple holes centered on concentric circles coaxial with the disk, or by any other method, provided the total cross-sectional area of ​​the holes corresponds to the properties of the selected reagent (inhibitor). The alignment of the perforation holes and the corresponding disks prevents disk breakage under the vertical load it bears, extending its service life and increasing the overall service life of dispenser 4. Any of the described perforation options offers the stated advantage.

[0040] Sealing gasket 11 is made of moisture-resistant, oil-resistant, heat-resistant elastic material and is intended for sealing and fixing the dispenser device in housing 1, as well as sealing the installation of filter element 12 in the dispenser.

[0041] The sealing gasket 11 is made of rubbers, polymers or composite materials, such as nitrile, butadiene-nitrile, ethylene-propylene and fluororubbers, polyurethanes, polyamides or rubbers with reinforcing fibre or based on polyurethanes.

[0042] The described materials have sufficient strength and at the same time meet the criteria of moisture resistance, oil resistance, heat resistance and elasticity, which determines their resistance to wear during operation in a well and, accordingly, increases the service life of the dispenser 4.

[0043] The filter element 12 is made of woven or non-woven materials, such as polyester or polypropylene fabrics, stainless steel mesh (thread), felt, spunbond, meltblown.

[0044] Each of the described materials is chemically resistant and also allows for cleaning during the operation of the dispenser, which increases the service life and, accordingly, the service life of the dispenser 4.

[0045] The possibility of replacing the sealing gasket 11 and the filter element 12 allows the continued operation of the dispenser 4 in the event of critical wear of these elements by replacing them, which extends the service life of the dispenser 4 and, accordingly, its resource.

[0046] The lower and upper discs are made of sheet metal or synthetic material, such as steel, stainless steel, titanium, nickel alloys, fiberglass, polyethylene, polypropylene, fluoroplastic or polyamide.

[0047] The lower and upper disks are identical in diameter. The thrust elements can be plates 15 made of 2-4 mm thick sheet metal or cylindrical metal bushings 16. The thrust elements form the skeleton of the dispenser chamber 17, the space of which is limited by the walls of the housing 1 and thrust disks 13 and 14.

[0048] The thrust elements are made of, for example, steel, stainless steel, titanium, or nickel alloys. These materials possess sufficient static and dynamic strength, preventing premature failure. Bolts 9 are inserted into the square holes of the metering disk 8 and secured with nuts 18, tightening the metering device 4.

[0049] The thrust elements can be placed on bolts 9 or can be clamped by bolts 9 and nuts 18 and upper and lower disks.

[0050] Any of the described options for detachable fastening of the thrust elements allows for their tight fit to the corresponding disks, uniform distribution of the adjacent load and protection from breakage, which in turn increases the service life of the dispenser 4.

[0051] An embodiment of the utility model is a dispenser 4 including lower disks detachably connected to a single upper thrust disk 14 (Fig. 3).

[0052] The single upper disc 14 eliminates the need for an additional thrust spacer 11 between the upper discs. Eliminating the wear element can reduce the overall number of component replacements and associated wear, which can ultimately increase the service life of the dispenser 4.

[0053] An embodiment of the utility model is a dispenser 4 including lower disks detachably connected to three or more upper disks mounted through sealing gaskets 11 between them (Fig. 4).

[0054] A larger number of upper disks allows for the installation of a larger number of sealing gaskets 11, which in turn can increase the strength of fastening of the dispensers 4 and, accordingly, can increase the service life of the dispenser 4.

[0055] The reagent (inhibitor) dispenser 4 is used as follows.

[0056] The reagent (inhibitor) dispenser 4 is assembled by installing the lower metering disk 8 on the bolts 9 so that the square heads of the bolts 9 are in the corresponding square holes of the lower metering disk 8, after which the sealing gasket 11 with the filter element 12 is installed on top, covered with the upper metering disk 10, then the next sealing gasket 11 and the lower thrust disk 13 are installed, or the installation operation of each existing pair of the sealing gasket 11 and the upper metering disk 10 is repeated, after which the lower thrust disk 13 is installed. After this, the thrust element in the form of a thrust plate 15 or a thrust sleeve 16 is installed.Then, the upper thrust disk 14 is mounted on the bolts 9 and nuts 18 are screwed on, or the sealing gasket 11 and the next upper thrust disk 14 are mounted and this operation is repeated for each existing pair of the sealing gasket 11 and the upper thrust disk 14 and after this, nuts 18 are screwed on the bolts 9. The assembled pair of dispensers is mounted in the housing so that the lower disks are directed towards each other and separate the space 7 filled with the reagent from the chambers of the dispensers 17 formed between the upper and lower disks and the wall of the container housing, while the chambers of the dispensers 17 are located opposite the corresponding dosing holes 6 and are connected through them with the annular space of the well or the intra-tube space of the NNO. After the dispensers 4 are installed in the reagent feeder housing, one or two fixing bolts 5 are screwed into the dosing holes 6. The space 7 between the dispensers 4 is then filled with the reagent (inhibitor). Nuts 18 are then tightened on bolts 9.

[0057] Thus, the technical result of the claimed utility model, which consists of increasing the service life of the submersible reagent (inhibitor) dispenser 4, is achieved by the presence of thrust elements, which increases the device's strength and evenly distributes the load on the supporting structural elements. This increases the device's operating time before critical failure and, consequently, its service life. Furthermore, the detachable connection of the disks with the thrust elements allows for the replacement of each device element, extending its service life and increasing its service life. Sealing gaskets 11 securely fasten the dispenser within housing 1, preventing its movement and wear from interaction with housing 1, which in turn extends the service life of the device. The replaceable filter element 12 allows for both its replacement and disassembly and cleaning, extending the service life of each individual element and the device as a whole.

Claims

FORMULA 1. An immersion dispenser for a reagent-inhibitor, containing lower and upper disks, detachably connected to each other through thrust elements, the lower disks are made in the form of dosing disks and a support disk, the upper disks are support disks, between the lower disks and between the upper disks there are replaceable sealing gaskets, the lower disks and sealing gaskets contain perforations in which a replaceable filter element is installed.

2. An immersion dispenser for a reagent-inhibitor according to claim 1, characterized in that it is designed with the possibility of dosing a solid and liquid reagent.

3. An immersion dispenser for a reagent-inhibitor according to paragraph 1, characterized in that the lower and upper disks are made of sheet metal.

4. An immersion dispenser for a reagent-inhibitor according to claim 1, characterized in that the lower and upper disks are made of synthetic material.

5. An immersion dispenser for a reagent-inhibitor according to paragraph 1, characterized in that the stop elements are made in the form of bushings.

6. An immersion dispenser for a reagent-inhibitor according to claim 1, characterized in that the stop elements are made in the form of plates.

7. An immersion dispenser for a reagent-inhibitor according to claim 1, characterized in that the stop elements are made of metal.

8. An immersion dispenser for a reagent-inhibitor according to claim 1, characterized in that the filter element is made of a filter material.

9. An immersion dispenser for a reagent-inhibitor according to paragraph 1, characterized in that the sealing gasket is made of a moisture-resistant, oil-resistant, heat-resistant material.

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