阅读说明：本技术 一种深潜电机补偿器 (Deep submersible motor compensator ) 是由 姚春雪 张戍军 于 2021-08-29 设计创作，主要内容包括：本发明涉及补偿器技术领域,一种深潜电机补偿器,其中补偿器筒体套装在滑动密封内套的外部且同轴设置,第一连接座和第二连接座分别密封的安装在补偿器筒体和滑动密封内套之间区域的两端,滑动密封组件可滑动密封的安装滑动腔室中,滑动密封组件为中部具有通孔的环状结构,滑动密封组件的外环面可滑动密封的抵接在补偿器筒体的内环面,滑动腔室被滑动密封组件分隔成靠近第一连接座侧的第一腔室和靠近第二连接座侧的第二腔室,金属囊为管状体且可挠性变形,金属囊的两端分别连接外接连接体和滑动密封组件上,外接连接体上设有用于连接第一腔室和外部可变压力流体腔室的通孔。本深潜电机补偿器具有结构简单、补偿效率高,运行平稳的优点。(The invention relates to the technical field of compensators, in particular to a compensator for a deep-submerged motor, wherein a compensator cylinder is sleeved outside a sliding sealing inner sleeve and is coaxially arranged, a first connecting seat and a second connecting seat are respectively and hermetically arranged at two ends of the area between the compensator cylinder and the sliding sealing inner sleeve, a sliding sealing component is slidably and hermetically arranged in a sliding chamber, the sliding seal assembly is of an annular structure with a through hole in the middle, the outer annular surface of the sliding seal assembly can be in sliding seal butt joint with the inner annular surface of the compensator cylinder, the sliding chamber is divided into a first chamber close to the first connecting seat side and a second chamber close to the second connecting seat side by the sliding seal assembly, the metal bag is of a tubular body and is flexible and deformable, the two ends of the metal bag are respectively connected to the external connecting body and the sliding seal assembly, and the external connecting body is provided with the through hole used for connecting the first chamber and the external variable pressure fluid chamber. The compensator for the deep submersible motor has the advantages of simple structure, high compensation efficiency and stable operation.)

1. A deep submergence motor compensator which is characterized in that: the compensator comprises a first connecting seat, a second connecting seat, a compensator cylinder, a sliding seal inner sleeve, a sliding seal assembly, a metal bag and an external connecting body, wherein the compensator cylinder and the sliding seal inner sleeve are of cylindrical structures, the compensator cylinder is sleeved outside the sliding seal inner sleeve and coaxially arranged, the first connecting seat and the second connecting seat are respectively and hermetically arranged at two ends of an area between the compensator cylinder and the sliding seal inner sleeve, a tubular sliding chamber is formed between the inner ring surface of the compensator cylinder, the outer ring surface of the sliding seal inner sleeve and the first connecting seat and the second connecting seat, the sliding seal assembly is slidably and hermetically arranged in the sliding chamber, the sliding seal assembly is of an annular structure with a through hole in the middle, the inner ring surface of the sliding seal assembly is slidably and hermetically sleeved on the outer ring surface of the sliding seal inner sleeve, and the outer ring surface of the sliding seal assembly is slidably and hermetically abutted against the inner ring surface of the compensator cylinder, the sliding chamber is separated into a first chamber close to the side of the first connecting seat and a second chamber close to the side of the second connecting seat by the sliding sealing assembly, the external connecting body is installed in the first chamber and close to the first connecting seat, the metal bag is tubular and flexible and deforms, the external connecting body at the first end of the metal bag faces the end face of the first chamber, the second end of the metal bag is connected to the end face of the sliding sealing assembly facing the first chamber, and a through hole used for connecting the first chamber and the external variable pressure fluid chamber is formed in the external connecting body.

2. Deep submergence motor compensator according to claim 1, characterized by: and the first connecting seat and the external connecting body are provided with oil supplementing channels, the first ends of the oil supplementing channels are arranged on the end surfaces, facing the first cavity, of the external connecting bodies, and the second ends of the oil supplementing channels are arranged on the outer ring surface of the first connecting seat.

3. Deep submergence motor compensator according to claim 2, characterized by: a breathing hole penetrating through the sliding sealing inner sleeve is formed in the sliding sealing inner sleeve, which is close to the second connecting seat, and the second cavity is communicated with the tubular cavity in the sliding sealing inner sleeve through the breathing hole;

the first cavity is communicated with well fluid through an oil supplementing channel, and the second cavity is filled with motor oil.

4. Deep submergence motor compensator according to claim 2, characterized by: a breathing hole penetrating through the sliding sealing inner sleeve is formed in the sliding sealing inner sleeve close to the external connecting body, and the breathing hole enables the first cavity to be communicated with a tubular cavity in the sliding sealing inner sleeve;

the first cavity is filled with motor oil, an oil supplementing channel is sealed, and a channel used for communicating external well fluid of the second cavity is arranged on the second connecting seat.

5. Deep submergence motor compensator according to claim 1, characterized by: the metal capsule is made of an Inconel alloy membrane.

6. Deep submergence motor compensator according to claim 1, characterized by: the metal bag is a tubular body with a cavity inside, and the metal bag has the capacity of flexible deformation along the axial direction of the metal bag.

7. Deep submergence motor compensator according to claim 1, characterized by: and double-layer sealing elements are arranged on the inner ring surface of the sliding sealing assembly and the outer ring surface of the sliding sealing inner sleeve.

8. Deep submergence motor compensator according to claim 1, characterized by: a sealing structure is arranged at the position opposite to the first connecting seat and the external connecting body; a sealing structure is arranged at the position, opposite to the sliding sealing inner sleeve, of the first connecting seat; a sealing structure is arranged at the position, opposite to the sliding sealing inner sleeve, of the external connecting body; a sealing structure is arranged at the position, opposite to the first connecting seat, of the compensator cylinder; a sealing structure is arranged at the position, opposite to the second connecting seat, of the compensator cylinder; and a sealing structure is arranged at the position, opposite to the second connecting seat, of the sliding sealing inner sleeve.

9. Deep submergence motor compensator according to claim 1, characterized by: the first connecting seat is connected with the external connecting body through a plurality of evenly distributed bolts.

10. Deep submergence motor compensator according to claim 1, characterized by: the first connecting seat and the second connecting seat are both of annular plug-shaped structures, and the external connecting body is located between the compensator cylinder and the sliding seal inner sleeve.

Technical Field

The invention relates to the technical field of compensators, in particular to a deep submergence motor compensator which is particularly suitable for the environments of offshore deep submergence, land submergence, oil field underground lifting and the like.

Background

When the deep submersible motor works in an extreme environment, the volume of lubricating oil expands or retracts under the influence of a temperature environment, the pressure outside the motor also enables the inside and the outside of the motor to generate a certain degree of pressure difference, and the sealing of the motor fails so as to burn the motor. The deep submergence motor is therefore usually provided with a compensator. The compensator is mainly used for compensating the lubricating oil lost in the operation of the motor and balancing the pressure difference between the inside and the outside of the motor, so that the motor is protected, and the service life of the motor is prolonged.

In general, a compensator is connected in series with a motor, the motor is a main body, the compensator is an accessory, and the compensator functions to compensate motor oil and protect the motor. The compensator and the motor are both of slender structures, and the length of the compensator is determined according to the quantity of oil stored in the motor and the length of the design service life.

At present, a compensator for a deep-submerged motor under an extreme environment cannot be met, so that the design and manufacture of the compensator for the deep-submerged motor become an urgent need in the deep-submerged industry.

Disclosure of Invention

In order to solve the problems, the compensator for the deep submergence motor provided by the invention has the advantages of simple structure, high compensation efficiency and stable operation.

In order to achieve the purpose, the invention adopts the technical scheme that:

a compensator of a deep submersible motor comprises a first connecting seat, a second connecting seat, a compensator cylinder, a sliding sealing inner sleeve, a sliding sealing assembly, a metal bag and an external connecting body, wherein the compensator cylinder and the sliding sealing inner sleeve are of cylindrical structures, the compensator cylinder is sleeved outside the sliding sealing inner sleeve and coaxially arranged, the first connecting seat and the second connecting seat are respectively and hermetically arranged at two ends of an area between the compensator cylinder and the sliding sealing inner sleeve, a tubular sliding cavity is formed between the compensator cylinder inner ring surface, the sliding sealing inner sleeve outer ring surface and the first connecting seat and the second connecting seat, the sliding sealing assembly is slidably and hermetically arranged in the sliding cavity, the sliding sealing assembly is of an annular structure with a through hole in the middle, the sliding sealing assembly inner ring surface is slidably and hermetically sleeved on the sliding sealing inner sleeve outer ring surface, the outer ring surface of the sliding seal assembly is in butt joint with the inner ring surface of the compensator cylinder in a sliding seal mode, the sliding chamber is divided into a first chamber close to the first connecting seat side and a second chamber close to the second connecting seat side by the sliding seal assembly, the external connecting body is installed in the first chamber and close to the first connecting seat, the metal bag is a tubular body and deforms flexibly, the external connecting body at the first end of the metal bag faces the end face of the first chamber, the second end of the metal bag is connected to the end face of the sliding seal assembly facing the first chamber, and a through hole used for connecting the first chamber and the external variable-pressure fluid chamber is formed in the external connecting body.

Preferably, the first connecting seat and the external connecting body are provided with an oil supplementing channel, a first end of the oil supplementing channel is arranged on the end face, facing the first cavity, of the external connecting body, and a second end of the oil supplementing channel is arranged on the outer annular surface of the first connecting seat.

Preferably, a breathing hole penetrating through the sliding sealing inner sleeve is formed in the sliding sealing inner sleeve, which is close to the second connecting seat, and the breathing hole enables the second cavity to be communicated with the tubular cavity in the sliding sealing inner sleeve;

the first cavity is communicated with well fluid through an oil supplementing channel, and the second cavity is filled with motor oil.

Preferably, a breathing hole penetrating through the sliding sealing inner sleeve is formed in the sliding sealing inner sleeve, which is close to the external connecting body, and the breathing hole enables the first chamber to be communicated with the tubular cavity in the sliding sealing inner sleeve;

the first cavity is filled with motor oil, an oil supplementing channel is sealed, and a channel used for communicating external well fluid of the second cavity is arranged on the second connecting seat.

Preferably, the metal capsule is made of an Inconel alloy membrane.

Preferably, the metal balloon is a tubular body having a cavity therein, and the metal balloon has a flexible deformation capability along an axial direction thereof.

Preferably, a double-layer sealing element is arranged on the inner ring surface of the sliding sealing assembly and the outer ring surface of the sliding sealing inner sleeve.

Preferably, a sealing structure is arranged at the position, opposite to the first connecting seat and the external connecting body; a sealing structure is arranged at the position, opposite to the sliding sealing inner sleeve, of the first connecting seat; a sealing structure is arranged at the position, opposite to the sliding sealing inner sleeve, of the external connecting body; a sealing structure is arranged at the position, opposite to the first connecting seat, of the compensator cylinder; a sealing structure is arranged at the position, opposite to the second connecting seat, of the compensator cylinder; and a sealing structure is arranged at the position, opposite to the second connecting seat, of the sliding sealing inner sleeve.

Preferably, the first connecting seat and the external connecting body are connected through a plurality of evenly distributed bolts.

Preferably, the first connecting seat and the second connecting seat are both of annular plug-shaped structures, and the external connecting body is located between the compensator cylinder and the sliding sealing inner sleeve.

The beneficial effects of the invention are as follows:

the compensator has simple structure, high compensation capacity per unit volume and large compensation space, and effectively reduces the length of equipment; the corrosion resistance is more excellent, and the service life of the deep submersible motor is greatly prolonged; the device is suitable for working in high and low temperature extreme environments.

Drawings

FIG. 1 is a schematic structural diagram of a compensator for a deep submergence vehicle according to the present invention.

Fig. 2 is a schematic structural diagram of a deep submergence motor compensator in embodiment 2 of the invention.

FIG. 3 is a schematic structural diagram of a deep submergence motor compensator in embodiment 3 of the present invention.

The reference numerals include:

1-first connecting seat, 2-first cavity, 3-metal bag, 4-sliding seal subassembly, 5-second cavity, 6-compensator barrel, 7-sliding seal endotheca, 8-second connecting seat, 9-sealing member, 10-external connector, 11-oil supplementing channel, 12-breathing hole.

Detailed Description

To facilitate an understanding of the invention, the invention will now be described more fully with reference to the accompanying drawings. Exemplary embodiments of the invention are shown in the drawings. This invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete.

It will be understood that when an element is referred to as being "secured to" another element, it can be directly on the other element or intervening elements may also be present. When an element is referred to as being "connected" to another element, it can be directly connected to the other element or intervening elements may also be present. The terms "vertical," "horizontal," "left," "right," and the like as used herein are for illustrative purposes only. As used herein, the term "and/or" includes any and all combinations of one or more of the associated listed items.

Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. The terminology used in the description of the invention herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention.

Example 1

As shown in fig. 1, a compensator for a deep submersible motor comprises a first connecting seat 1, a second connecting seat 8, a compensator cylinder 6, a sliding seal inner sleeve 7, a sliding seal assembly 4, a metal bag 3 and an external connecting body 10, wherein the compensator cylinder 6 and the sliding seal inner sleeve 7 are both in a cylindrical structure, the compensator cylinder 6 is sleeved outside the sliding seal inner sleeve 7 and coaxially arranged, the first connecting seat 1 and the second connecting seat 8 are respectively and hermetically installed at two ends of an area between the compensator cylinder 6 and the sliding seal inner sleeve 7, a tubular sliding chamber is formed between the inner ring surface of the compensator cylinder 6, the outer ring surface of the sliding seal inner sleeve 7 and the first connecting seat 1 and the second connecting seat 8, the sliding seal assembly 4 is slidably and hermetically installed in the sliding chamber, the sliding seal assembly 4 is in an annular structure with a through hole in the middle part, the inner ring surface of the sliding seal assembly 4 is slidably and hermetically sleeved on the outer ring surface of the sliding seal inner sleeve 7, but the outer circumferencial sliding seal's of sliding seal subassembly 4 butt is at the interior anchor ring of compensator barrel 6, the slip cavity is separated into by sliding seal subassembly 4 and is close to first cavity 2 of first connecting seat 1 side and is close to second cavity 5 of second connecting seat 8 side, external connector 10 is installed in first cavity 2 and is close to first connecting seat 1, metal bag 3 is the tubulose body and the pliability is out of shape, the external connector 10 of the first end of metal bag 3 is towards the terminal surface department of first cavity 2, the second end connection of metal bag 3 is on the terminal surface of sliding seal subassembly 4 towards first cavity 2, be equipped with the through-hole that is used for connecting first cavity 2 and outside variable pressure fluid cavity on the external connector 10.

In this embodiment, the first connection seat 1 and the external connection body 10 are provided with an oil supplementing channel 11, a first end of the oil supplementing channel 11 is provided on an end surface of the external connection body 10 facing the first chamber 2, and a second end of the oil supplementing channel 11 is provided on an outer annular surface of the first connection seat 1. In this embodiment, the oil supply passage 11 is used as a passage for supplying motor oil to the first chamber 2, and the oil supply passage 11 may be further sealed so that the motor oil in the first chamber 2 does not flow out of the oil supply passage 11 due to pressure change.

The metal capsule 3 is made of an Inconel alloy membrane. The metal capsule 3 is a tubular body having a cavity inside, and the metal capsule 3 has the ability to flexibly deform in its axial direction. The Inconel alloy is a high Ni-Cr alloy that can be used in the temperature range of-196 c to 1093 c. The Inconel alloy has excellent corrosion resistance to both reducing environment and weak oxidizing environment, and has excellent corrosion resistance to chloride ion stress corrosion cracking. The Inconel alloy has no magnetism, has good welding performance, and is a material with excellent performance for manufacturing the metal bag 3. Due to the characteristics of complex medium components, high-temperature and high-pressure environment and specific corrosive medium in deep sea and under oil field wells, the excellent corrosion resistance of the Inconel alloy can greatly improve the working performance and prolong the service life of the compensator.

The inner ring surface of the sliding seal assembly 4 and the outer ring surface of the sliding seal inner sleeve 7 are provided with double-layer sealing elements 9, so that compensation failure or compensation damage caused by fluid passing through the sliding seal assembly 4 and flowing in the first chamber 2 and the second chamber 5 is avoided.

In order to ensure that other parts of the first chamber 2 and the second chamber 5 except the designed fluid passage are sealed in the compensator so as to avoid the leakage of fluid at the positions except the designed fluid passage, in the embodiment, a sealing structure is arranged at the opposite position of the first connecting seat 1 and the external connecting body 10; a sealing structure is arranged at the position of the first connecting seat 1 opposite to the sliding sealing inner sleeve 7; a sealing structure is arranged at the position opposite to the external connecting body 10 and the sliding sealing inner sleeve 7; a sealing structure is arranged at the position of the compensator cylinder opposite to the first connecting seat 1; a sealing structure is arranged at the position, opposite to the second connecting seat 8, of the compensator cylinder 6; and a sealing structure is arranged at the position of the sliding sealing inner sleeve 7 opposite to the second connecting seat 8.

The first connecting seat 1 and the external connecting body 10 are connected through a plurality of evenly distributed bolts, the first function is to connect the first connecting seat 1 and the external connecting body 10, and the second function can compress a sealing structure between the first connecting seat 1 and the external connecting body 10.

The first connecting seat 1 and the second connecting seat 8 are both of annular plug-shaped structures, and the external connecting body 10 is positioned between the compensator cylinder 6 and the sliding sealing inner sleeve 7.

Embodiment 1 is the basic structure of the deep submergence motor compensator, and can be understood as the minimum sale unit of the deep submergence motor compensator.

The following describes a modification of the deep submergence motor compensator and its environment and effect in use in detail by way of example 2 and example 3.

Example 2

As shown in fig. 2, the deep submergence motor compensator in this embodiment is the same as embodiment 1, and is structurally different in the position of the breathing hole 12.

Specifically, a breathing hole 12 penetrating through the sliding sealing inner sleeve 7 is formed in the sliding sealing inner sleeve 7 at a position close to the second connecting seat 8, and the breathing hole 12 enables the second chamber 5 to be communicated with a tubular cavity inside the sliding sealing inner sleeve 7; the first chamber 2 is communicated with well fluid through an oil supplementing channel 11, and the second chamber 5 is filled with motor oil.

In this embodiment, the first chamber 2 can be communicated with well fluid through an oil supplementing channel 11, the second chamber 5 is filled with motor oil, a breathing hole 12 is formed at a position close to the lower end of the sliding seal inner sleeve 7, when the internal and external pressure difference is unbalanced, the pressure difference pushes the sliding seal assembly 4, the sliding seal assembly 4 enables the metal bag 3 to compress or extend along the sliding seal inner sleeve 7 under the action of the sealing element 9, and the motor oil enters and exits through the breathing hole 12 at the lower end of the sliding seal inner sleeve 7 and a gap between the sliding seal inner sleeve 7 and the compensator shaft, so that the motor oil is absorbed or compensated by the motor.

Example 3

As shown in fig. 3, the deep submergence motor compensator in this embodiment is the same as embodiment 1, and is structurally different in the position of the breathing hole 12.

Specifically, a breathing hole 12 penetrating through the sliding sealing inner sleeve 7 is formed in the sliding sealing inner sleeve 7 close to the external connecting body 10, and the breathing hole 12 enables the first chamber 2 to be communicated with a tubular cavity inside the sliding sealing inner sleeve 7; the first cavity 2 is filled with motor oil and the oil supplementing channel 11 is sealed, and the second connecting seat 8 is provided with a channel for communicating the external well fluid of the second cavity 5.

In this embodiment, the first chamber 2 can be communicated with well fluid through an oil supplementing channel 11, the second chamber 5 is filled with motor oil, the lower end of the sliding seal inner sleeve 7 is provided with a breathing hole 12, when the difference between the internal pressure and the external pressure is unbalanced, the pressure difference pushes the sliding seal assembly 4, so that the sliding seal assembly 4 compresses or extends the metal bag 3 along the sliding seal inner sleeve 7 under the action of the sealing element 9. The motor oil passes through a breathing hole 12 at the lower end of the sliding sealing inner sleeve 7 and enters and exits through a gap between the sliding sealing inner sleeve 7 and the compensator shaft, and the motor oil absorption or compensation effect is achieved for the motor.

In combination with the above examples 1-3, and taking fig. 3 as an example, assume that the unit is operating downhole in an oilfield. First cavity 2, 3 inner chambers of metal bag are full of motor oil promptly, are well liquid in the second cavity 5, and second cavity 5 and the outside intercommunication of unit realize that well liquid circulates between the outside of unit and second cavity 5.

During normal working of the motor, a certain amount of lubricating oil (motor oil) can be consumed by the lubricating system, so that the pressure in the first chamber 2 is reduced, the pressure difference between two sides of the sliding seal assembly 4 is unbalanced, the sliding seal assembly 4 is moved leftwards, the metal bag 3 is compressed, the motor oil in the first chamber 2 enters the lubricating system through the breathing hole 12, and the consumed lubricating oil is compensated. The compensation function of the deep submergence motor compensator is described above.

If the environmental temperature of motor work risees, the pressure that lubricating system bore in the motor increases in the twinkling of an eye, motor oil in the lubricating system gets into in the metal bag 3 through breathing hole 12, the pressure differential of sliding seal subassembly 4 both sides is unbalanced, make sliding seal subassembly 4 remove right, even metal bag 3 extension, if metal bag 3 reaches the maximum elongation, still do not reach pressure balance, in order to guarantee motor safe and stable operation, must in time let out some motor oil, motor oil discharges through oiling passageway 11, reduces pressure. The above is the protection function of the motor compensator.

It can be understood that the motor compensator provides the basic structure of the compensator, and if the left chamber and the right chamber are exchanged, similar functions and effects can be derived.

While the present invention has been described with reference to the embodiments shown in the drawings, the present invention is not limited to the embodiments, which are illustrative and not restrictive, and it will be apparent to those skilled in the art that various changes and modifications can be made therein without departing from the spirit and scope of the invention as defined in the appended claims.