Downhole device with rotating assemblies resistant to formation of depositions (versions)

FIELD: mining.

SUBSTANCE: downhole device includes a housing with a channel passing along its axis, a shaft located in the housing and passing through the channel. The shaft is installed so that it can be rotated in axial direction within restricted limits. Downhole device includes a radial bearing arranged in the housing channel to support the shaft. The bearing includes an insert installed in the housing and a sleeve installed on the shaft. The sleeve and the insert have the possibility of interaction. The sleeve has the possibility of being rotated along the housing axis and moved in axial direction together with the shaft. With that, there is a gap between inside diameter of the insert and outside diameter of the sleeve. One of the bearing elements, either the sleeve or the insert, has a smaller axial gap than the other one. Axial ends of the element having the smaller axial size never project beyond axial ends of the other element. As per the other version of the invention, one of the bearing elements, either the sleeve or the insert, has a sharp angle on its axial end for scraping depositions off the interacting surface of the other element.

EFFECT: reduction of formation of depositions in radial bearings for downhole devices.

 

The technical field to which the invention relates.

The present invention relates to radial bearings and, more particularly, to a device for components and assemblies electrical submersible pumps using radial bearings that are resistant to the formation of deposits.

The level of technology

In many downhole pumping systems containing rotating equipment, such as electric submersible pumps (APN), separators and intake devices, there is a serious problem of the formation of deposits in the gaps of the radial bearings. Sediment is any material that can be deposited on the surfaces of the environment in which the downhole equipment. One of the problems is that the formation of deposits creates interference for axial movement of the shaft, and with it the entire rotating Assembly, a relatively stationary support housing. This problem can become critical even in those cases when the layer of sediments are very thin, for example about 0.001 inch or more.

As you can see in figure 1, the traditional radial bearing 11 typically contains consistently located sleeve 13, which shows only one, on the shaft 15, and all bushings have the same diameter, and are included in the liner 17 of the bearing. Liners and is tulki radial bearing can have a common difference of the diameters or the backlash from some of 0.003 inch to about 0.015 in between their inner and outer diameters, respectively. Deposits are formed in the gap on the outer surface of the sleeve bearing and can act in an axial direction beyond the inner surface of the liner. In this case, any axial movement of the shaft formed of sediments involved in the small gap 19 between the liner 17 and the sleeve 13. Formed when sediments are drawn into the gap in the radial bearing there is a very large friction force.

This problem is compounded for radial bearings by the presence of the bevels 21 at the edges of the liners 17 and the sleeves 13. When the movement of the shaft 15 in the axial direction bevels 21 on the edges act as a funnel or Cams, which contribute to vtalkivaniya more sediment into the gap 19 of the bearing. The resulting additional friction may cause many kinds of problems. For example, the bearing and/or bushing can overheat the bearing may fail due to lack of lubrication and overheating, and the sleeve can jam in the liner. In addition, sediment can limit the life or to prevent re-use pumps, separators or inlet devices due to the limited stroke of the shaft in the axial direction, or due to jamming of the shaft. Moreover, the pump may be blocked and prevent the starting of the engine, in which the result of which the motor may be damaged due to excessive heat. In addition, excessive friction can cause the cutting guide device, which is below the bushing, resulting in the continued operation of the pump may cause excessive wear of the shaft, weakening and destruction. Thus, there is a need for improved design, which allows to overcome the limitations and problems known technical solutions.

Disclosure of inventions

In the description of the discussed embodiments of the present invention, that reduce the formation of deposits on the components and the nodes of the radial bearings of electric submersible pumps. The invention is well suited for use in downhole rotating equipment such as pumps, separators and intake devices. Instead of the usual materials for the manufacture of liners and sleeves can be used materials, resistant to wear and to the deposition of sediment, such as tungsten carbide, impregnated with polytetrafluoroethylene, etc.

In one of the embodiments of the invention one of the elements (the liner or sleeve) may be shorter than the other, so he is always inside another element, regardless of their relative axial movement. In addition, the longitudinal surfaces of the liners or sleeves, that is, on their interacting p. the surfaces, can be formed with sharp corners. When you move shaft in axial (axial) direction is an acute angle on one element will be to scrape deposits from the surface of another element. This construction will involve the removal of sediment, so that they will not enter the gap between the sleeve and the liner.

In another embodiment, the invention can be used in a restrictive sleeve of smaller diameter at both ends of the sleeve in the axial direction, so that the deposits will be formed on restrictive sleeves away from the inner diameter of the liner, and will not have the problems associated with sediments. In addition, in this case describeme sediments will be removed from the bearing. Can optionally be used in the working gap of the order of 0.001 inch between the sleeve and the liner to increase the flow of the lubricant and cooling components. This item may also be required for some applications in connection with the use of sharp edges on the sleeves and liners.

The above and other features and advantages of the present invention will become obvious to a person skilled in the art after reviewing the following detailed description together with the accompanying drawings and claims.

Brief description of drawings

The difference is these signs, the features and advantages of the present invention, briefly described above, can be easier to understand from the following description, in which are disclosed private embodiments of the invention (in no way limit the invention) with reference to the accompanying drawings on which is shown:

figure 1 is a schematic side view of a longitudinal section of known construction radial bearing;

figure 2 - schematic side view of a longitudinal section of one embodiment of a design of a radial bearing in accordance with the invention;

figure 3 - schematic side view of a longitudinal section of another variant of the design of the radial bearing in accordance with the invention;

figure 4 is a schematic side view of a longitudinal section of another variant of the design of the radial bearing in accordance with the invention;

figure 5 is a schematic side view of one embodiment of the design of the downhole rotating device in accordance with the invention;

figure 6 is an enlarged side view of one of the variants of "sharp edges" of one or several structures of the radial bearing disclosed in the description.

The implementation of the invention

Embodiments of the invention, that reduce the formation of deposits in the radial bearings for the IC is aginig devices presented with reference to Fig.2-6. The invention is well suited for use in downhole rotating equipment such as components nodes electric submersible pumps, such as pumps, separators, inlet, etc.

One of the embodiments of the invention are presented in figure 2. The downhole device has a housing 31 with a longitudinal geometrical axis 33 and the channel 35 is held in the housing 31 along the axis 33. In the channel 35 of the housing has a shaft 37 passing along the axis 33 in the housing 31. The shaft 37 can rotate relative to the housing 31 and can be moved in the axial direction within certain limits, depending on application and design.

To reduce the formation of deposits in the wells of the device has a radial bearing 41. Radial bearing 41 is located in the channel 35 of the housing 31 for holding the shaft 37 in a certain position relative to the housing 31. Radial bearing 41 contains a liner 43, mounted in the housing 31, and the sleeve 45 mounted on the shaft 37 and is designed to interact with the liner 43. Sleeve 45 rotates and moves axially with the shaft 37 relative to the housing 31 and the liner 43. Between the inner diameter of the liner 43 and the outer diameter of the sleeve 45 is formed in the gap 47.

In the embodiment of the invention, represented in figure 2, the sleeve 45 is a reproach to the Chennai length 51, and the liner 43 has an increased length 53, which is more shortened length 51. In such an arrangement the axial ends 55 of the sleeve 45 will never extend beyond the axial ends 57 of the liner 43 with limited axial displacement of the shaft 37. Figure 3 presents an alternative embodiment of the invention in which the sleeve 45 is longer than the liner 43. Similarly, the axial ends 57 of the liner 42 will never extend beyond the axial ends 55 of the sleeve 45 when the axial movement of the shaft 37 within a limited range.

In some embodiments of the invention the liner 43 and sleeve 45 made of materials resistant to abrasion and deposition on their surfaces. For example, the liner 43 and sleeve 45 may be made of tungsten carbide, impregnated with polytetrafluoroethylene. Alternatively, these components can be coated, impregnated or otherwise formed using materials resistant to abrasion and deposition on their surfaces.

In other embodiments, the liner 43 and/or the sleeve 45 can be to have sharp corners 61 (see Fig.6) at their axial ends 57, 55, respectively. Figure 6 shows the signs exaggerated for clarity. Sharp corners 61 can be performed PA one or both axial ends of the element for scraping deposits from another element glad the material of the bearing (namely, the liner can scrape deposits from the sleeve, and the sleeve with liner) on their respective mating surfaces.

This device facilitates the removal of surface deposits, and they will not enter into the gap 47 between the liner 43 and sleeve 45. For example, the angle 61 may have a maximum radius of 0.005 inch, and the front angle 63 may be less than 90°, for example, from 85° to 89°. Front angle 63 contributes suscribase action and extending the service life of an acute angle in the case of abrasion of the surface. If the angle is less than 90°, it is samosatene" soccerbase angle as the wear surface, and thus, design is resistant to the deposition of sediment.

As shown in figure 4, proposed in the invention can optionally contain resistant to the deposition of sediment restrictive sleeve 71 of smaller diameter located on the shaft 37 and abutting against the axial ends 55 of the sleeve 45 of the bearing. Restrictive bushing 71 define the limits of the mechanical movement to ensure the correct axial position of the bearing bushing on the shaft. Can also be used thrust ring 73 or other mechanical device for holding a restrictive bushing 71 in the correct axial position. In some embodiments of the invention feature a restrictive wtule the perform of the hub of the impeller of the pump. Each of these limiting axial movement can be used in other embodiments of the invention, described, for example, presented in figure 1-3.

Can additionally be used in the working gap of the order of 0.001 inch between the sleeve and the liner to increase the flow of the lubricant and cooling of the bearing elements. This characteristic may also be necessary for some applications due to sharp edges on the sleeves and liners.

Figure 5 presents one of the options downhole device for wells 110. The downhole device includes the installation of 11 electric submersible pump placed in the borehole 110. Installation 11 pump may be a centrifugal pump 112 from the inlet device 113 and the internal separator. To the pump 112 is attached to the sealing section 114 and an electric motor 116, and they are all immersed in the downhole fluid 118. The motor shaft 116 is connected to the shaft sealing section, and further with the shaft of a centrifugal pump 112. Installation 11 of the pump and the downhole fluid 118 is located within the casing 119, which is part of the well 110. The pump 112 is connected with the Elevator column 125, which transmits downhole fluid 118 in tank storage (not shown). Design of radial bearing disclosed in the present description, can be used the Ana in pumps, the separators, suction devices, and other components that are suitable for use in wells.

Although the invention has been discussed and described only in some forms, the experts with this field of technology, it should be clear that the invention is not limited to these forms, which may be made of various modifications without going beyond the scope of the invention. For example, at the corners of the longer element bearing (liner or sleeve) may be performed bevels facilitate the introduction of the longer element. However, it should be prevented displacement of the bearing elements under the bevels at their thermal expansion or axial displacement of the shaft in the end position.

1. The downhole device, comprising a housing with a channel passing through the body along its axis, a shaft located in the housing and passing through the specified channel in the housing along its axis for rotation relative to the housing and moving in the axial direction to a limited extent, radial bearing, ensuring the reduction of deposits placed in the channel of the housing to support the shaft relative to the housing and including a liner mounted in the housing, and a bushing mounted on the shaft with the opportunity to interact with the liner, rotation along the axis of the housing and moving in EfE the second direction together with the shaft relative to the housing and liner, and thus between the inner diameter of the liner and the outer diameter of the sleeve there is a gap, and one of the elements of the bearing, liner or sleeve has a smaller axial dimension than the other, so that the axial ends of the element having a smaller axial dimension, never advocated the axial ends of the element, which has a larger axial dimension, with said limited movement along the axis.

2. The downhole device according to claim 1, represents a component of the electrical submersible pump.

3. The downhole device according to claim 2, in which component the installation of electric submersible pump is a pump, a separator or suction device.

4. The downhole device of claim 1, wherein the liner and the sleeve is made of materials resistant to abrasion and the formation of deposits.

5. The downhole device according to claim 4, in which the liner and the sleeve is made of tungsten carbide, impregnated with polytetrafluoroethylene.

6. The downhole device of claim 1, wherein one of the elements, the liner or sleeve has an acute angle at its axial end for scraping deposits from the cooperating surface of the other element and remove these deposits so that they do not fall into the gap between the liner and the sleeve.

7. The downhole device of claim 6, in which the radius of an acute angle n is greater than 0.005 inch, and the front angle less than 90°.

8. The downhole device of claim 6, in which both axial end of one element, the liner or sleeve, have sharp corners.

9. The downhole device of claim 6, in which both the liner and the sleeve have sharp edges.

10. The downhole device according to claim 1, additionally containing a restrictive bushing located on the axial ends of the bearing bushing and resting in them as mechanical stops for holding the sleeve bearing to the right along the axis of body position on the shaft, the diameter of the restrictive bushing is less than the diameter of the bearing bushing and they are made from a material resistant to the formation of deposits.

11. The downhole device of claim 10, in which a restrictive bushing includes a thrust ring or hub of the impeller of the pump.

12. The downhole device, comprising a housing with a channel passing through the body along its axis, a shaft located in the housing and passing through the specified channel in the housing along its axis for rotation relative to the housing and moving in the axial direction to a limited extent, radial bearing, ensuring the reduction of growth of deposits placed in the channel of the housing to support the shaft relative to the housing and including a liner mounted in the housing, and a bushing mounted on the shaft capacity is through interaction with the liner, rotation along the axis of the housing and moving in the axial direction together with the shaft relative to the housing and liner, and between the inner diameter of the liner and the outer diameter of the sleeve there is a gap, and one of the elements of the bearing, liner or sleeve has a smaller axial dimension than the other, so that the axial ends of the element having a smaller axial dimension, never advocated the axial ends of the element, which has a larger axial dimension, with said limited movement along the axis, and one of the elements, the liner or sleeve has an acute angle at its axial end for scraping deposits from the interacting surface of the other element and remove the deposits so they do not fall into the gap between the liner and the sleeve.

13. The downhole device according to item 12, which represents one component of the installation of electric submersible pump comprising a pump, a separator or suction device.

14. The downhole device according to item 12, in which the liner and the sleeve is made of materials resistant to abrasion and to the formation of deposits.

15. The downhole device 14, in which the liner and the sleeve is made of tungsten carbide, impregnated with polytetrafluoroethylene.

16. The downhole device according to item 12, in which the radius of an acute angle not greater than 0.005 inch, and before the second angle is less than 90°.

17. The downhole device according to item 12, in which both axial end of one element, the liner or sleeve, have sharp corners.

18. The downhole device according to item 12, in which both the liner and the sleeve have sharp edges.

19. The downhole device according to item 12, optionally containing a restrictive bushing located on the axial ends of the bearing bushing and resting in them as mechanical stops for holding the sleeve bearing to the right along the axis of the corps position on the shaft, the diameter of the restrictive bushing is less than the diameter of the bearing bushing and they are made from a material resistant to the formation of deposits.

20. The downhole apparatus according to claim 19, in which the restrictive bushing includes a thrust ring or hub of the impeller of the pump.



 

Same patents:

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Downhole tool // 2331753

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Downhole tool // 2331753

FIELD: petroleum industry.

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FIELD: engines and pumps.

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EFFECT: longer life and higher reliability of spindle axial plain bearing, higher accuracy of borehole curvature parameters and improved performances of drilling.

4 cl, 9 dwg

FIELD: mining.

SUBSTANCE: facility for borehole drilling consists of cone bit with support, above-bit tube, unit for support unloading in form of washing plate with circular lug creating together with reverse cones of roller cutters friction pairs, facility also consists of unit of forced-circulation running of roller cutters installed inside above-bit tube and made in form of axial turbine, shaft of which is connected with washing plate. According to one version the reverse cones of roller cutters are made with a circular groove, while the circular lug of the washing plate contacting with them has congruous shape and is assembled in circular grooves of reverse cones of roller cutters. According to another version the circular lug of the washing plate on end is made with at least one circular groove, while contacting with it reverse cones of roller cutters have congruous shape and lugs of reverse cones of roller cutters placed in circular groove are installed with a gap relative to the bottom of the circular groove and armoured with rock destroying elements.

EFFECT: increased calibrating characteristic of cone bit, increased driving property and mechanical rate of drilling.

3 cl, 3 dwg

FIELD: engines and pumps.

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EFFECT: increases resource and reliability of motor spindle, increases accuracy of inclined and horizontal wells tunneling, rate of wells curvature parametres gain, reduces resistances and stresses in drill pipe string bottom layout due to reduction of spindle length and chisel projection, increases strength of spindle body threaded joint to nipple via radius sections of well shaft under conditions of friction and rotation in well shaft.

7 cl, 5 dwg

FIELD: oil and gas production.

SUBSTANCE: overflow check valve is related to the field of drilling and geological survey wells and may be used in drilling with screw downhole motor. It comprises valve body with subs, inside of which there is a plunger body and a spring-loaded hollow plunger, which is plugged at the bottom. Plunger comprises upper radial holes and is arranged in upper and lower parts, which are connected to each other by means of joint elements to create lower radial holes of plunger between them. Bushing with circular bore is located at the level of plunger holes in its lower position. Cavity of upper sub is hydraulically connected in upper position of plunger with plunger holes, radial holes of plunger body and radial holes of valve body, in lower position of plunger - with its lower radial holes and cavity of lower sub. Bush is made of hard baked alloy VK-8.

EFFECT: improved conditions for passage of flushing fluid, reduced hydraulic resistance in straightened channels.

3 cl, 2 dwg

FIELD: oil and gas production.

SUBSTANCE: device contains pressure gauge receiving one or several pressure pulses and module of electronic instruments maintaining connection with pressure gauge. The module of electronic instruments determines command of pressure pulses to actuate the downhole tool. An engine is coupled with the module of electronic instruments. The engine is tied with a connecting mechanism converting rotating motions of the engine into a linear motion. Additionally the device is equipped with a valve system coupled with the connecting mechanism. The valve system actuates the downhole tool when the valve system is in an open phase.

EFFECT: increased accuracy of control of drive of downhole tools due to decreased power consumption for driven tool and due to generation of differential pressure with low pressure in atmospheric chamber and high pressure of well fluid.

25 cl, 10 dwg

FIELD: machine building.

SUBSTANCE: multiple-row planetary gear consists of case (1) wherein there are installed central shaft (2) with common gear (3), carrier (4) with satellites (11) arranged in rows on it and central gear made complex and equipped with main rims (12). Friction rings (13) are positioned between the rims. Elements of the central gear are compressed in axial direction. Ends of intermediate friction rings (13) and ends of main rim (12) opposite to them have conic surfaces interacting with friction. Intermediate friction rings (13) are split and ensure friction interaction with their external cylinder surfaces with internal cylinder surface of case (1). Satellites (11) on carrier (4) are set in rows in orifices (or slots) made in the carrier. Optimal aperture angle δ of cone of interacting conic end surfaces of main rims and conic end surfaces of friction rings is δ=60-90°.

EFFECT: increased output capacity of gear.

5 cl, 4 dwg

FIELD: oil and gas industry.

SUBSTANCE: filter for drill column with hydraulic downhole motor, which includes hollow housing with threads on its edges and filtering module for drilling fluid, which is installed in hollow housing, tubular casing installed in hollow housing and forming together with filtering tube, inlet and outlet sleeves a receiving cavity for mechanical impurities. Module contains filtering tube with slot channels, which is attached by inlet edge to fairing, inlet and outlet sleeves provided with annular grooves and elastomer rings installed in annular grooves and designed for sealing of hollow housing. Inlet sleeve is provided with centring band directed towards tubular casing. Centring band of inlet sleeve is telescopically connected to inner inlet part of tubular casing. Annular groove is made on centring band of inlet sleeve, and inlet sealing element is installed in annular groove of inlet sleeve. At that, outlet sleeve is provided with centring band directed towards tubular casing. Centring band of outlet sleeve is telescopically connected to inner outlet part of tubular casing. Annular groove is provided on centring band of outlet sleeve, and outlet sealing element is installed in annular groove of outlet sleeve. At that, filtering tube is connected by means of thread to outlet sleeve; extension hook is fixed on front end of fairing, and external surfaces of inlet and outlet sleeves, elastomer rings and outer surface of tubular casing contact with one inner surface of hollow housing.

EFFECT: improving reliability and increasing service life of filter, improving inclined and horizontal well making accuracy.

3 cl, 6 dwg

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