High-temperature and high-bearing electric submersible pump protector

Abstract

The utility model belongs to the field of oil exploitation technical equipment, particularly relates to a high-temperature and high-bearing electric submersible pump protector, and aims to improve the bearing capacity and the corrosion resistance of the high-bearing electric submersible pump protector. The thrust bearing comprises a thrust bearing assembly, the thrust bearing assembly comprises a thrust bearing moving block, a thrust bearing static block and a tilting slip block, and a polycrystalline diamond coating is arranged on the contact surface of the thrust bearing moving block and / or the tilting slip block. The high-wear-resistance and low-friction-coefficient high-wear-resistance brake pad has extremely high wear resistance and low friction coefficient, can reduce heat generation and power loss, and has good chemical stability.

Description

TECHNICAL FIELD

[0001] The utility model belongs to the technical equipment field of oil exploitation, specifically relates to a high temperature high bearing submersible electric pump protector. BACKGROUND

[0002] The protector is an important component of the submersible electric pump, and it balances the pressure in and outside the motor, bears the axial force of the centrifugal pump, and connects the motor and the separator to transmit power for the centrifugal pump during the operation of the submersible electric pump.

[0003] With the development of domestic oil and gas exploration and development in China to more and deeper directions, 80% of the newly discovered oil and gas resources in China belong to deep and ultra-deep layers, and the number of ultra-deep and super-deep well drilling is increasing. At present, there are more than 200 ultra-deep wells.

[0004] However, to exploit ultra-deep and super-deep wells, the lifting capacity of the electric pump needs to reach more than 6000m, which means that the axial force from the centrifugal pump will be greatly enhanced, and the downhole working conditions will be more severe. Therefore, the submersible electric pump unit needs to have better corrosion resistance and high temperature resistance, and thus a high bearing submersible protector with higher bearing capacity and corrosion resistance is needed to protect the submersible electric pump. SUMMARY

[0005] In order to solve the above problems in the prior art, that is, to improve the bearing capacity and corrosion resistance of the high bearing submersible electric pump protector, the utility model provides a high temperature high bearing submersible electric pump protector.

[0006] The technical scheme of the utility model:

[0007] A high temperature high bearing submersible electric pump protector, the protector comprises a thrust bearing assembly, characterized in that the thrust bearing assembly comprises a thrust bearing moving block, a thrust bearing static block and an inclinable riding block, and a polycrystalline diamond coating is arranged on the contact surface of the thrust bearing moving block and / or the inclinable riding block.

[0008] As an optional technical scheme, the protector further comprises a tandem double sedimentation cavity arranged at the front end of the thrust bearing assembly.

[0009] As an optional technical scheme, the protector comprises a capsule cavity located at the front end of the tandem double sedimentation cavity.

[0010] As an optional technical scheme, the protector further comprises a high pressure mechanical sealing device, and the high pressure mechanical sealing device is arranged at the most front end of the protector.

[0011] As an optional technical scheme, the protector further comprises a centralizing bearing, and the centralizing bearing is arranged between the high pressure mechanical sealing device and the capsule cavity.

[0012] As an alternative technical solution, the protector further comprises a filter cavity, which is arranged at the rear end of the thrust bearing assembly.

[0013] The utility model discloses beneficial effect:

[0014] (1) the utility model discloses a poly crystalline diamond surface coating is arranged on the tiltable slipper block and thrust bearing moving block dynamic contact surface, compared with ordinary thrust bearing, poly crystalline diamond has high thermal conductivity and can reduce the condition of bearing degradation due to local extreme temperature, especially in the start and shutdown stage, high thermal conductivity can reduce the possibility of bearing local welding, adapt to the downhole high temperature working condition of super / special deep well, avoid the scratch and wear of bearing surface.

[0015] (2) poly crystalline diamond has very high wear resistance and lower friction coefficient, can reduce the generation of heat and reduce power loss, has good chemical stability.

[0016] (3) poly crystalline diamond has very high hardness and fracture toughness, so that it can carry very large axial load and can reduce the possibility of damage caused by impact load, and can resist the wear of downhole fluid, which makes the protector of the utility model especially adapt to the technical requirements of super / special deep well submersible electric pump. BRIEF DESCRIPTION OF DRAWINGS

[0017] Other features, objects and advantages of the application will become more apparent from the following detailed description of non-limiting embodiments made with reference to the accompanying drawings:

[0018] Figure 1 It is the structure schematic diagram of high temperature high bearing submersible electric pump protector of the utility model.

[0019] Figure 2 It is the structure schematic diagram of thrust bearing static block and tiltable slipper block of the utility model.

[0020] Figure 3 It is the structure schematic diagram of thrust bearing moving block of the utility model.

[0021] Reference signs:

[0022] 1-high pressure mechanical seal, 2-centralizing bearing, 3-capsule cavity, 5-thrust bearing, 6-filter cavity, 7-thrust bearing moving block, 8-thrust bearing static block, 9 tiltable slipper block, 41-first sedimentation cavity, 42-second sedimentation cavity, 71-coating, 91-coating. DETAILED DESCRIPTION

[0023] The application will be further described in detail below with reference to the drawings and embodiments. It can be understood that the specific embodiments described herein are only used to explain the related utility model, and not limit the utility model. In addition, it should be noted that only the parts related to the utility model are shown in the drawings for ease of description.

[0024] It should be noted that the embodiments in the present application and the features in the embodiments can be combined with each other without conflict. The present application will be described in detail below with reference to the drawings and embodiments.

[0025] The utility model provides a high temperature high bearing submersible electric pump protector.

[0026] As Figure 1 The utility model discloses a high temperature high bearing submersible electric pump protector's structure schematic diagram, and the protector is sequentially provided with high pressure mechanical seal 1, righting bearing 2, capsule cavity 3, first sediment cavity 41, second sediment cavity 42, thrust bearing 5, filter cavity 6 from front to back.

[0027] Among them, high pressure mechanical seal 1 is located at the foremost end of the protector, and separates the inside of the protector from the outside liquid.

[0028] Righting bearing 2 guarantees the stable posture of output shaft operation.

[0029] Capsule cavity 3 absorbs or releases the volume change of motor oil caused by temperature change by breathing, using its own expansion and contraction, balances the pressure between the motor inside and the wellbore, and eliminates the pressure difference around the motor shaft seal.

[0030] First sediment cavity 41 and second sediment cavity 42 can accommodate the permeated liquid in layers when well fluid leakage occurs, to give the downhole motor sufficient service life.

[0031] Thrust bearing 5 mainly bears axial load, as Figure 2 It is the structure schematic diagram of thrust bearing static block 8 and tiltable shoe block 9, Figure 3 It is the structure schematic diagram of thrust bearing dynamic block 7.

[0032] Tiltable shoe block 9 is provided with polycrystalline diamond coating 91 on the dynamic contact surface, and thrust bearing dynamic block 7 is provided with polycrystalline diamond coating 71 on the dynamic contact surface.

[0033] Polycrystalline diamond coating is a new material with high hardness, high wear resistance and high corrosion resistance. At present, it has been widely used in the field of cutters and dies.

[0034] Filter cavity 6 can filter some impurities and friction debris, etc., to avoid its direct entry into the motor, causing the performance of the motor to decline or be damaged.

[0035] In summary, the high-temperature high-bearing capacity submersible electric pump protector can bear large axial load, high temperature and high pressure. When operating in the well, the high-pressure mechanical seal 1 isolates the axial fluid, the sealing effect under high pressure is improved by increasing the sealing pressure grade; the journal bearing 2 provides radial support for the shaft to maintain stable operation of the mechanical seal; the capsule cavity 3 realizes the isolation of motor oil and well fluid, and breathes with the outside world through the check valve to maintain the balance of internal and external pressure; the settling cavity 41 and the settling cavity 42 mainly settle some solid particles and delay the failure time; the thrust bearing 5 provides axial force bearing and stability adjustment of the shaft; the filter cavity 6 filters some impurities and friction debris, etc., to avoid direct entry into the motor.

[0036] The thrust bearing moving block 7 rotates at high speed, and the rotating speed is about 3000r / min, the thrust bearing static block 8 remains stationary, and the tiltable shoe block 9 generates high-speed friction between the thrust bearing moving block 7, since the poly crystalline diamond material coating is adopted in the utility model, the friction coefficient is low, the heat production is small, in addition, the temperature resistance grade of the material is higher, which can reach 750 DEG C, and the downhole operation environment demand can be completely met.

[0037] The flexibility of the tiltable shoe block 9 can adjust the state of the shaft and improve the stability.

[0038] In addition, the high chemical stability, chemical corrosion resistance, anti-bonding characteristics, high wear resistance and good heat resistance of the poly crystalline diamond material are important guarantees for the stable operation of the protector of the utility model.

[0039] In the description of the utility model, the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer" and other terms indicating direction or positional relationship are based on the direction or positional relationship shown in the drawings, which is only for the convenience of description, and is not indicative or implied that the device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the utility model. In addition, the terms "first", "second", "third" are only for descriptive purposes, and cannot be understood as indicating or implying relative importance.

[0040] In addition, it also needs to be explained that, in the description of the utility model, unless otherwise explicitly specified and limited, the terms "mounting", "connection", "connection" should be broadly understood, for example, it can be fixedly connected, or it can be detachably connected, or integrally connected; it can be mechanically connected, or it can be electrically connected; it can be directly connected, or it can be indirectly connected through an intermediate medium, or it can be the communication between two elements. For those skilled in the art, the specific meaning of the above terms in the utility model can be understood according to the specific circumstances.

[0041] The term "comprising" or any other similar word is intended to encompass the inclusion of one or more steps, features, or elements but not to the exclusion of any other steps, features, or elements. The term "comprising" therefore indicates that the inclusion of one or more steps, features, or elements is not a requirement and that other steps, features, or elements can also be included.

[0042] Thus far, the technical solutions of the present application have been described in conjunction with the preferred embodiments shown in the drawings, but those skilled in the art will readily understand that the protection scope of the present application is obviously not limited to these specific embodiments. Those skilled in the art can make equivalent changes or replacements to the relevant technical features without deviating from the principles of the present application, and the technical solutions after these changes or replacements will all fall within the protection scope of the present application.

Claims

1. A high temperature high load ESP protector, said protector comprising a thrust bearing assembly, characterized in that, The thrust bearing assembly comprises a thrust bearing shoe, a thrust bearing shoe and an inclinable shoe, and a polycrystalline diamond coating is arranged on the contact surface of the thrust bearing shoe and / or the inclinable shoe.

2. The high temperature high load submersible electric pump protector of claim 1, wherein: The protector further comprises a tandem double-deposition cavity arranged at the front end of the thrust bearing assembly.

3. The high temperature high load ESP protector of claim 2, wherein: The protector comprises a capsule cavity arranged at the front end of the tandem double-deposition cavity.

4. The high temperature high load ESP protector of claim 3, wherein: The protector further comprises a high-pressure mechanical seal device arranged at the most front end of the protector.

5. The high temperature high load ESP protector of claim 4, wherein: The protector further comprises a centralizing bearing arranged between the high-pressure mechanical seal device and the capsule cavity.

6. The high temperature high load ESP protector of claim 1, wherein: The protector further comprises a filter cavity arranged at the rear end of the thrust bearing assembly.

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