WO2017188425A1 - Power-feeding connector for pump and downhole equipment provided with power-feeding connector - Google Patents

Abstract

The invention is a power-feeding connector for a pump, and downhole equipment equipped with the power-feeding connector wherein a portion where a metal terminal is disposed can be protected from a corrosive gas infiltrating to the interior of the power-feeding connector. Accommodated inside a pot head (50) is a seal member (100) whereby three inserted power-feeding cables (30) are held at predetermined positions of the pot head (50). The seal member (100) comprises a forward cylinder portion (101) having an equivalent external diameter dimension to the internal diameter of the pot head (50), a rear cylinder portion (102), a ring recessed groove (103), and three hollow cylinder portions (104). Each of the three hollow cylinder portions (104) is provided as a single body and protrudes from an opening peripheral edge of a corresponding insertion hole (102b) on a rear surface portion (102a). Ring recessed grooves (104b) are formed in a recessed manner on each internal peripheral surface at the end (104a) of each of the cylinder portions (104) wherein an O-ring member (110) is fitted while abutting the external side surface (33a) of a cover material (33) from each of the power-feeding cables (30).

Description

Downhole equipment with pump power connector and power connector

The present invention relates to a power supply connector for a pump and a downhaul device including the power supply connector.

Conventional pumps used for drilling wells such as oil fields or gas fields are provided with power supply connectors for connecting power supply cables for supplying power from the outside such as the ground surface.
In such a power supply connector, potting is performed so as to surround a connection portion between a metal terminal disposed in the case of the terminal box and a terminal of the cable drawn to the outside, and the cable extends into the case. An annular seal member having a smaller diameter and elasticity than the outer diameter of the cable is attached to the portion (see, for example, Patent Document 1).

In such a case, the seal member is mounted with a tightening force on the cable by an elastic restoring force.
For this reason, even if the potting material is deformed due to secular change or the like and the sealing performance is impaired, the annular sealing member is deformed so as to follow the contraction deformation of the outer peripheral surface of the cable and maintain the sealed state.
Therefore, the moisture transmitted on the cable surface is blocked by the annular seal member, and water can be prevented from entering the portion where the terminal is disposed.

JP2015-70735A US Pat. No. 8,491,282

However, when such a power supply connector for a conventional pump is used in a region where the environmental pressure is high, such as in an oil well or a gas field, the outer peripheral surface of the cable is deformed in the direction of diameter reduction due to the pressure.
If the deformation in the diameter reducing direction exceeds a certain amount, the annular seal member cannot follow the deformation of the outer peripheral surface of the cable and cannot maintain a sealed state with respect to the cable. For this reason, there is a possibility that the corrosive gas may travel along the cable surface from the gap formed between the outer peripheral surface of the cable and the annular seal member and enter the portion where the metal terminal is disposed.
An object of the present invention is to provide a power supply connector for a pump and a downhaul device including the power supply connector that can protect a portion where a metal terminal is disposed from a corrosive gas that enters the power supply connector.

The power feeding connector of the pump according to the present invention includes a cable disposed so as to straddle a high pressure region from a low pressure region having a pressure lower than that of the high pressure region, and a cable inserted through the cable. A pot head that connects the metal terminal provided at the tip to the pump, and a sealing member that is housed in the pot head and holds the inserted cable at a predetermined position of the pot head. Including an insertion hole through which the cable is inserted and a cylindrical portion extending from the opening periphery of the insertion hole toward the low pressure region, and the cylindrical portion is deformed by the pressure from the outer peripheral surface, and the outer surface of the cable It is characterized by having flexibility to make the space hermetic.

According to the present invention, the tube portion is deformed toward the inserted cable by the pressure from the outer peripheral surface, and the space between the outer surface of the cable is made airtight. For this reason, the corrosive gas does not enter the connector through the cable and does not reach the position of the metal terminal provided at the tip of the cable.

According to the present invention, there is provided a power supply connector for a pump that can protect a portion where a metal terminal is disposed from a corrosive gas that enters the power supply connector.

It is a figure which shows the installation state of the electric power feeding connector of the pump of embodiment, and is a typical longitudinal cross-sectional view explaining the structure of the whole excavation well. It is a figure which shows the installation state of the electric power feeding connector of the pump of embodiment, and is a perspective view of the connection part of a pot head and a pump. It is a figure which shows the installation state of the electric power feeding connector of the pump of embodiment, and is a typical side view of the connection part of a pot head and a pump. It is a figure which shows the installation state of the electric power feeding connector of the pump of embodiment, and is a perspective view explaining the structure of a pot head. FIG. 5 is a diagram showing an installation state of the power feeding connector of the pump of the embodiment, and is a cross-sectional view at a position along the line VV in FIG. 4. FIG. 5 is a diagram showing an installation state of a power feeding connector of a pump of a comparative example of the embodiment, and is a cross-sectional view at a position corresponding to a position along the line VIII-VIII in FIG. It is a figure which shows the installation state of the electric power feeding connector of the pump of embodiment, and is the perspective view which looked at the sealing member arrange | positioned inside a connector from the rear end side. It is a figure which shows the installation state of the electric power feeding connector of the pump of embodiment, and is an exploded perspective view which shows a mode that a sealing member is equipped internally. It is a figure which shows the installation state of the electric power feeding connector of the pump of embodiment, and is sectional drawing in the position along the IX-IX line in FIG. FIG. 10 is a diagram illustrating an installation state of the power feeding connector of the pump according to the embodiment, and is a schematic cross-sectional view at a position along the line XX in FIG. 9. It is a figure which shows the installation state of the electric power feeding connector of the pump of embodiment, and is an expanded sectional view of the XI part in FIG. It is the electric power feeding connector of the pump of the modification 1 of embodiment, and is the perspective view which looked at the sealing member arrange | positioned inside a connector from the rear end side. FIG. 13 is a diagram illustrating an installation state of the power supply connector of the pump according to the first modification of the embodiment, and is a cross-sectional view taken along a line XIII-XIII in FIG. 12. It is a figure which shows the installation state of the electric power feeding connector of the pump of the modification 2 of embodiment, and is an expanded sectional view of the part corresponded in FIG. It is the electric power feeding connector of the pump of the modification 3 of embodiment, and is the perspective view which looked at the sealing member arrange | positioned inside a connector from the rear end side. BEST MODE FOR CARRYING OUT THE INVENTION

Embodiments of the present invention will be described with reference to the drawings.
Drawing 1 is a figure showing the installation state of the electric power feeding connector of the pump of an embodiment, and is a typical longitudinal section explaining the composition of the whole excavation well.
Oil and gas stored in a well (hereinafter also referred to as “downhole”) 1 used for Oil & Gas mining (hereinafter abbreviated as oil mining) in addition to being a high temperature and high pressure environment compared to the surface The downhole equipment such as the pump 10 to be submerged is exposed to an environment where it is easily corroded (hereinafter referred to as a corrosive environment).

For this reason, the connector portion 20 as the power supply connector of the present embodiment is provided on the pump 10 located in the high pressure region so as to extend from the low pressure region where the pressure is lower than the high pressure region to the high pressure region. A pot head 50 that connects the connection pin 70 as a metal terminal provided at the tip of the power supply cable 30 through the power supply cable 30, and the power supply cable that is accommodated in the pot head 50 and inserted And a sealing member 100 (to be described later) having a function of a holding member for holding 30 at a predetermined position of the pot head 50.
In addition to the pump 10 and the like that operate in the environment in the well 1, the feed cable 30 that feeds power to the pump 10 and the connector portion 20 that connects the feed cable 30 to the pump 10 are also resistant to resistance. Corrosiveness is required and high reliability is required.

Generally, the power supply cable 30 is installed over a depth that becomes a high pressure region of several hundred to several thousand meters from the ground surface, which is a low pressure region where the pressure is lower than that of the high pressure region.
On the ground surface, an inverter 41 constituting an output power source and a control unit 40 for controlling the inverter 41 are installed. The power supply cable 30 extending from the inverter 41 is configured to be connected to the pump 10 via the connector unit 20.

FIG. 2 is a diagram illustrating an installation state of the power supply connector of the pump 10 according to the embodiment, and is a perspective view of a connection portion between the pot head (fixing member) 50 and the pump 10.
In this embodiment, the cylindrical casing 15 that covers the outside of the pump 10 is formed with a notch-shaped recess 11 on the side surface. Further, a cable insertion hole 12 is formed in the seating surface portion 11 a of the recess 11 orthogonal to the longitudinal direction of the pump 10.
Then, the pot head 50 of the connector portion 20 is fastened to the seat surface portion 11a by the plurality of bolt members 13. Thereby, the pot head 50 is fixed to the casing 15 in a state where the axial direction of the power feeding cable 30 is along the longitudinal direction of the pump 10.

FIG. 3 is a diagram illustrating an installation state of the power supply connector of the pump 10 according to the embodiment, and is a schematic side view of a connection portion between the pot head 50 and the pump 10.
Inside the well 1, the oil before pumping is retained. In these oils 2, the casing 15 of the pump 10 is submerged, and a pump body (not shown) is positioned in the high pressure region.

A feeding cable 30 is inserted into the pot head 50 in order to supply electric power to a pump body provided inside the casing 15.
A connect pin 70 as a metal terminal provided at the tip of the power supply cable 30 is connected to a power cable 60 that supplies power to a motor (not shown) inside the casing 15.

In this state, an annular seal member 52 is interposed between the seat surface portion 11a of the recess 11 and the mounting surface 51 of the pot head 50. For this reason, the watertight state is maintained so that the oil 2 does not enter the inside of the casing 15.

FIG. 4 is a perspective view illustrating the configuration of the pot head 50, showing the installation state of the power feeding connector of the pump according to the embodiment.
The pot head 50 has a substantially spindle shape when viewed from the front, and a cable opening 55 is formed at the center. Bolt holes 56 and 56 are formed on both sides of the cable opening 55 so as to pass through the bolt members 13 and 13 (see FIG. 2).
Among these, the three power supply cables 30 are inserted into the cable opening 55. Metal connection pins 70 are attached to the respective ends of the three power supply cables 30.
Then, three power supply cables 30 connected to the rear end portion of the connect pin 70 are extended toward the ground surface in a state of being bundled from the opposite side surface of the pot head 50.

FIG. 5 is a diagram illustrating an installation state of the power feeding connector of the pump according to the embodiment, and is a cross-sectional view taken along the line VV in FIG.
The power feeding cable 30 has a conductor portion 31 made of copper or the like.
The periphery of these conductor portions 31 is covered with an insulating material 32 such as rubber. In addition, the outside of the insulating material 32 is configured to be covered with a covering material 33 made of lead or the like.
And the circumference | surroundings of the three electric power feeding cables 30 bundled are surrounded by the armor 35. The armor 35 is made of a metal such as stainless steel or a nickel-based alloy, and is configured to protect the internal power supply cable 30.

In the power supply cable 30 corresponding to such a downhole environment, the conductor portion 31 is exposed particularly for connection with the connect pin 70 (see FIG. 4). For this reason, the sealing structure for protecting the conductor part 31 in the connector part 20 (refer FIG. 2) from the corrosive gas in the well 1 (refer FIG. 1) is provided.

FIG. 6 is a diagram showing an installation state of the power supply connector of the pump of the comparative example of the embodiment, and is a cross-sectional view at a position corresponding to the position along the line VIII-VIII in FIG.
The feeding cable 30 is inserted and attached to a pot head 50 that fixes the feeding cable 30 to the casing 15 of the pump 10.
In the pot head 50, a cable holding member 80 that is housed and accommodated inside the pot head 50 is disposed. The cable holding member 80 is configured to hold a plurality of power feeding cables 30 led through the pot head 50 in the pump direction at predetermined positions with a predetermined interval therebetween.

The cable holding member 80 is provided with a large-diameter O-ring member 105. The large-diameter O-ring member 105 is fitted with a ring groove 103 that is annularly recessed on the outer peripheral surface of the cable holding member 80.
The large-diameter O-ring member 105 is configured to seal between the cable holding member 80 and the pot head 50 by contacting the inner peripheral surface of the pot head 50.

The cable holding member 80 is formed with a plurality of hole portions 81 having substantially the same diameter as the outer diameter of the power supply cable 30 at predetermined intervals, for example, at positions corresponding to the apexes of the equilateral triangle. .
And the conductor part 31 of each electric power feeding cable 30 is inserted in each hole part 81 of these cable holding members 80, and it connects to the connection opening 71a formed in the rear end side of the attachment member 71 which mounts the connection pin 70. Each is connected in the inserted state.
As a result, the feeding cable 30 and the three projecting connection pins 70 are positioned so as to be in a predetermined position, and the connector part male side 20a is formed.

In this comparative example, the pot head 50 configured as described above is mounted on the mounting surface 51 (see FIG. 3) of the casing 15. Thereby, the connector part male side 20a electrically connected to the conductor part 31 of these electric power feeding cables 30 and the connector part female side 20b provided in the casing 15 of the pump 10 can be joined (FIG. 8). reference). And by this joining, each electric power feeding cable 30 can be each electrically connected with the electric power cable 60 accommodated in the casing 15 of the pump 10 (refer FIG. 3).

In the pot head 50 of this comparative example, the sealing structure using the sealing member 52 provided in the pot head 50 prevents the corrosive gas contained in the underground layer from flowing into the connector portion 20.
The space shielded from the outside air by the seal structure becomes a low pressure environment, while the outside of the seal region becomes a high temperature / high pressure / corrosion environment of the underground layer. Examples of gas components contained in the high pressure environment region include hydrogen sulfide and carbon dioxide. It is known that the low-pressure environment region is a high-temperature environment equivalent to the underground environment, but the pressure is low and no corrosive gas is contained.

There are mainly two seal points on the pot head 50, one of which is a fastening surface between the pot head 50 and the mounting surface 51 of the casing 15, and generally a sealing member 52 such as an O-ring is bolted. Sealing is performed by sandwiching the fastening surface.

The other seal part is the cable introduction part 53 of the pot head 50. In the cable introduction portion 53, generally, a resin or the like is placed in the cover member 54 and the pot head 50 in a state where the power supply cable 30 is inserted into the cover member 54 and inserted into the cable holding member 80 in the pot head 50. The filler 57 is filled. And the clearance gap between each member is sealed because the filler 57 solidifies.

On the cable introduction portion 53 side, the insulating member 58 and the elastomer sheet 59 are fixed with an adhesive or the like to close the opening of the pot head 50. Thereby, the invasion of gas into the connector part 20 is prevented.
Further, an O-ring 90 is disposed thereon. The O-ring 90 is fitted into a ring groove 91 formed inside the hole 81 of the cable holding member 80. The O-ring 90 seals between the outer peripheral surface of the covering material 33 constituting the outer peripheral surface of the power feeding cable 30 and the inner peripheral surface of the hole 81 of the cable holding member 80.

In the power supply connector structure of this comparative example, a method of introducing a filler 57 into the pot head 50 from the cover member 54 and improving the sealing performance of the cable introducing portion 53 is adopted. However, in this method, it is necessary to pour the filler 57 in a state where the constituent members are in close contact with each other, and to solidify the filler 57 while maintaining the close contact state.

Also known is a method in which the power supply cable 30 and a sealing material such as the filler 57 are welded by heating to a high temperature after the pot head 50 is assembled. In the method of bringing these sealing materials into contact with the power supply cable 30, the sealing material and the power supply cable are obtained because the insulating material 32 and the covering material 33 positioned around the power supply cable 30 are relatively flexible during solidification. 30 and the position between the O-ring 90 and the power supply cable 30 may be displaced to reduce the contact pressure.

Furthermore, the rubber member constituting the insulating material 32 and the lead member constituting the covering material 33 are softer materials than iron. For this reason, there exists a possibility that the outer peripheral surface of the electric power feeding cable 30 of the part which the O-ring 90 is contacting may deform | transform into a diameter reduction direction by the vibration transmitted from an apparatus.
In particular, when used in a region where the environmental pressure is high, such as in a drilling well such as an oil field or a gas field, compared with the ground surface, the outer peripheral surface of the power supply cable 30 is covered with a covering member 33 made of lead material, The amount of deformation due to is relatively large, and once deformed, a gap remains between the surrounding members without elastic recovery.

For example, as shown by an arrow G in FIG. 6, the gas that has entered the pot head 50 from the cable introduction portion 53 side compares the outer peripheral surface portion of the power feeding cable 30 sealed by the O-ring 90 with the ground surface. Expose to high temperature and high pressure environment.
When the deformation amount of the outer peripheral surface of the power supply cable 30 exceeds the range in which the O-ring 90 provided around can be followed, a gap is generated between the outer surface of the power supply cable 30 and the O-ring 90, and the sealed state Can't keep up.

In this way, from the gap formed between the outer peripheral surface of the power supply cable 30 and the O-ring 90, the corrosive gas travels along the outer surface of the power supply cable 30 as indicated by the arrow G, and the hole of the cable holding member 80. It penetrates into the gap between the inner surface of 81 and the outer peripheral surface of the feeding cable 30.
Then, the corrosive gas entering the cable holding member 80 reaches the connect pin 70 via the metal attachment member 71.
For this reason, the corrosive gas indicated by the arrow G enters the portion where the connect pin 70 provided at the tip of the power supply cable 30 is disposed, and the metal connect pin 70 may be exposed to a corrosive environment. .

Furthermore, when the covering material 33 is deformed in the diameter reducing direction, there is a possibility that the O-ring 90 is detached from the ring groove portion 91 and is sandwiched between the power supply cable 30 and the cable holding member 80 and so-called biting may occur. .

On the other hand, the power supply connector of the pump 10 of the present embodiment is easy to construct, and so-called biting hardly occurs and the sealing performance can be improved. For this reason, the power supply connector of the pump 10 of this embodiment improves the reliability by providing the sealing member 100 so that the corrosive gas can be protected without entering the portion where the connect pin 70 is disposed. It is a thing.

FIG. 7 is a view showing an installation state of the power supply connector of the pump 10 according to the embodiment, and is a perspective view of the sealing member 100 disposed inside the connector as viewed from the rear end side. FIG. 8 is an exploded perspective view illustrating a state in which the sealing member 100 is housed in the pot head 50 of the connector unit 20 in the power supply connector of the pump 10 according to the embodiment. 7 and 8, the upper left in the figure is the bottom side (lower side) of the well 1, and the lower right in the figure is the ground surface side (upper side).

The sealing member 100 of this embodiment is accommodated in the pot head 50. And the sealing member 100 is comprised so that the three electric power feeding cables 30 penetrated may be hold | maintained in the predetermined position of the pot head 50. FIG.
That is, the sealing member 100 of this embodiment includes a front cylinder part 101 having the same outer diameter as the inner diameter of the pot head 50, a rear cylinder part 102 having the same outer dimension as the front cylinder part 101, and front and rear parts thereof. It includes a ring groove 103 that is located between the cylindrical portion 101 and the rear cylindrical portion 102 and is recessed in the outer peripheral surface, and three hollow cylindrical portions 104 that are integrally projected from the rear cylindrical portion 102. Yes.

Among these, a large-diameter O-ring member 105 that seals between the inner peripheral surface 50 a of the pot head 50 and the sealing member 100 is fitted into the ring concave groove 103.
Further, three insertion holes 102b are formed in the rear surface portion 102a of the rear cylinder portion 102 so as to be positions corresponding to the vertices of the regular triangle.

From the opening peripheral edge of these insertion holes 102b, three hollow cylindrical portions 104 are integrally protruded toward the low pressure region (upper side). On the inner peripheral surface of the end portion 104a of the cylindrical portion 104, ring concave grooves 104b are formed to be recessed.
An O-ring member 110 that abuts on the outer surface 33a of the covering material 33 of the power supply cable 30 is fitted in each ring groove 104b.

Furthermore, the sealing member 100 is comprised by the lead member which has low rigidity compared with iron. And the cylinder part 104 is extended toward the low voltage | pressure area | region from the opening periphery of the insertion hole 102b. These cylindrical portions 104 have flexibility. The cylindrical portion 104 of this embodiment has a thickness dimension along the radial direction (see FIG. 7).
The cylindrical portions 104 are deformed inward in the radial direction by the pressure applied from the outer surface 33a toward the axial center, and the O-ring member 110 forms an airtight state with the outer surface 33a of the power supply cable 30. It is configured.

FIG. 9 is a diagram illustrating an installation state of the power supply connector of the pump 10 according to the embodiment, and is a cross-sectional view at a position along the line IX-IX in FIG.
In this embodiment, the conductor portion 31 at the tip of the power supply cable 30 is inserted into a connection opening 71a formed on the rear end side of the attachment member 71 to which the connect pin 70 is attached and connected by caulking or the like. In this state, together with the connect pin 70, the sealing member 100 is inserted into the pot head 50, and is attached so that it cannot be removed by abutting the front end edge 106 against the stopper projection 61.

Each cylindrical portion 104 constituting the sealing member 100 of this embodiment has an axially extending direction from the end portion 104a to the proximal end portion 104d on the rear cylindrical portion 102 side except for a portion where the ring concave groove 104b is formed. The thickness d is set to be uniform (see FIG. 7).
A covering material 33 that covers the conductor portion 31 of the power feeding cable 30 is disposed inside the O-ring member 110 at the cylindrical portion 104 and the end portion 104a. For this reason, the outer surface 33 a of the covering material 33 is disposed so as to face the inner peripheral surface of the cylindrical portion 104.
Further, in this state, the packing member 120 and the cover member 54 are combined so as to fit inside the pot head 50, and the filler 57 is filled from the inside of the cover member 54.

A ring concave groove 104 b is formed on the inner side surface near the tip of each cylindrical portion 104. An O-ring member 110 is attached to the ring concave groove 104b. The O-ring member 110 is maintained in a sealed state by contact pressure with the power feeding cable 30.
The O-ring member 110 prevents the corrosive gas contained in the downhole environment of the high-pressure environment region 200 from entering the sealing member 100. And it can prevent that corrosive gas does not flow in into the connector part 20 used as low pressure similarly to the low voltage | pressure environment area 300. FIG.

Further, the stopper projection 61 prevents the cylindrical portion 104 from moving due to a differential pressure between the high pressure environment region 200 and the low pressure environment region 300, vibrations received from the motor of the pump 10, and the like. The peripheral surface of the stopper projection 61 may be a male screw and fastened with a female screw provided on the inner wall of the pot head 50. You may make it fix between the sealing member 100 and the stopper projection part 61 by bolt fastening.
Furthermore, the bolt fastening hole in the sealing member 100 is not a through hole, and the stopper projection 61 side is preferably fastened as a bolt head.

FIG. 10 is a diagram showing an installation state of the power supply connector of the pump according to the embodiment, and is a schematic cross-sectional view at a position along the line XX in FIG.

The sealing member 100 having the ring concave groove 103 (see FIG. 8), the O-ring member 110, and the stopper projection 61 of this embodiment are provided inside the pot head 50. And the cylinder part 104 of the sealing member 100 is exhibiting the shape which protruded the peripheral part of the cable insertion hole 12 in which the electric power feeding cable 30 was penetrated to the high voltage | pressure environment area 200 side.

FIG. 11 is an enlarged cross-sectional view of the periphery of the portion where the O-ring member 110 is disposed in FIG. The upper side (surface side) from the O-ring contact portion 301 is a high-pressure environment region 200 that is a high temperature / high pressure / corrosion environment, and the lower side (well bottom side) is a low-pressure environment region 300.
For this reason, in the cylinder part 104, the pressure at the side of the region 109 communicating with the low pressure environment region 300 is lower than the O-ring contact part 301 in the cylinder. On the other hand, the high pressure of the area 107 communicating with the high-pressure environment area 200 is applied to the outside of the cylindrical portion 104.

Therefore, a differential pressure in a direction in which the outer peripheral surface 104c is pressed against the outer surface of the covering material 33 of the power feeding cable 30 is generated in the portion of the cylindrical portion 104 on the region 109 side that communicates with the low pressure environment region 300 from the O-ring contact portion 301. To do. Due to such a differential pressure, the outer peripheral surface 104c is bent and deformed from the base end side, and the contact pressure between the power supply cable 30 and the O-ring member 110 is increased.

Further, due to the bending deformation of the outer peripheral surface 104c of the cylindrical portion 104, the low-pressure-side gap C1 of the O-ring member 110 is reduced. Thereby, the risk of damage due to biting into the gap of the O-ring member 110 can be reduced. Note that the material of the sealing member 100 formed of the same material as the cylindrical portion 104 may be a material with relatively low rigidity such as lead or rubber.
When such a relatively low-rigidity material is employed as the sealing member 100, the amount of bending deformation of the cylindrical portion 104 increases. For this reason, the sealing performance can be further improved, and the reliability of the anti-corrosion gas can be improved.

Next, the effect of the power supply connector of the pump of this embodiment will be described.
In this embodiment, as shown in FIG. 11, the cylindrical portion 104 is deformed toward the inserted power supply cable 30 by the pressure in the high-pressure environment region 200 from the outer peripheral surface. The O-ring member 110 in the vicinity of the end portion 104a of the cylindrical portion 104 is brought into an airtight state by being brought into pressure contact with the outer surface of the covering member 33 of the power supply cable 30 and surely sealing.
For this reason, the corrosive gas does not enter the connector portion 20 through the power supply cable 30 and does not reach the position of the connect pin 70 provided at the tip of the power supply cable 30.

As described above, in the power supply connector of the pump according to the present embodiment, even if the corrosive gas enters the connector, the outer surface of the power supply cable 30 is reliably sealed by the O-ring member 110. For this reason, the part in which the connect pin 70 is arrange | positioned can be protected from this corrosive gas.

Further, as in the comparative example, it is not necessary to perform a sealing operation such as fixing the insulating member 58 and the elastomer sheet 59 with an adhesive or the like to close the opening of the pot head 50 or filling with the filler 57. The number of parts can be reduced and the manufacturing process can be simplified.

Further, the sealing member 100 does not allow the corrosive gas to reach the position of the connect pin 70. For this reason, the anti-corrosion reliability of the power feeding cable 30 is improved, and the replacement cycle can be set relatively long. Therefore, the frequency of inspection can be reduced, the operation of the pump 10 can be continued while being submerged in the deep well 1, and the operation efficiency can be improved.
As described above, in the power supply connector of the pump according to the embodiment, by improving the reliability of the seal of the connector portion 20, it is possible to reduce the frequency of cable pull-up and re-installation due to failure.
Therefore, in the pump 10 provided with this connector part 20, the production efficiency of resources, such as oil or gas, can be raised more greatly than pumps, such as a comparative example.

FIG. 12 is a perspective view of the power supply connector of the pump according to the first modification of the embodiment as seen from the rear end side of the sealing member disposed inside the connector. FIG. 13 is a cross-sectional view at the position along the line XIII-XIII in FIG. 12 of the power feeding connector of the pump of the first modification of the embodiment. In addition, the same code | symbol is attached | subjected about the part thru | or equivalent to the said embodiment, and description is abbreviate | omitted.

In the power supply connector of the pump according to the first modified example, three cylindrical portions 504 project from the rear surface side 502a of the rear cylindrical portion 502 of the sealing member 500. These cylindrical portions 504 are formed so as to protrude from the opening peripheral edges of three insertion openings (not shown) so as to be positions corresponding to the respective apexes of the equilateral triangle.

Each cylindrical portion 504 is formed thin so that the proximal end side 506 is more flexible than the distal end flange portion 505 by forming a flange portion 505 on the distal end side.

FIG. 13 is a cross-sectional view taken along the line XIII-XIII in FIG. In the first modification, the outer diameter dimension D1 of the proximal end side 506 is set smaller than the outer diameter dimension D2 of the flange portion 505 (D1 <D2), whereby the thickness of the proximal end side 506 is set to the flange on the distal end side. It is thinner than the portion 505.

Among these, a ring groove 505b is formed in the inner surface of each flange portion 505, and an O-ring member 110 is mounted in the ring groove 505b.

In the power supply connector of the pump according to the first modified example configured as described above, three cylindrical portions 504 project from the rear surface side 502 a of the rear cylindrical portion 502 of the sealing member 500. The cylindrical portion 504 is set such that the outer diameter D1 of the base end side 506 is smaller than the outer diameter D2 of the flange portion 505 (D1 <D2).
For this reason, the thickness of the proximal end side 506 is thinner than the flange portion 505 on the distal end side, and if the outside of the cylindrical portion 404 is a region communicating with the high pressure environment region 200, a differential pressure is generated, resulting in a high pressure environment. It is deformed by the pressure in the area 200.

At this time, the outer diameter D1 of the base end side 506 of the cylindrical portion 504 is set smaller than the outer diameter D2 of the flange portion 505 (D1 <D2). For this reason, the wall surface of the base end side 506 is thin, easily deforms, and is formed so as to be in close contact with the outer peripheral surface of the power supply cable 30.
Therefore, even if a corrosive gas enters the connector, the O-ring member 110 is more reliably sealed. For this reason, the part in which the connect pin 70 is arrange | positioned can be protected from this corrosive gas.
Other configurations and operational effects are the same as or equivalent to those of the embodiment, and thus the description thereof is omitted.

FIG. 14 is a diagram illustrating an installation state of the power supply connector of the pump according to the second modification of the embodiment, and is an enlarged cross-sectional view of a portion corresponding to FIG. 11.
The cylindrical portion 704 of the sealing member 700 of Modification 2 has an unevenness 710 that is pressed against the outer surface of the covering material 33 of the power supply cable 30 on the inner peripheral surface.

In the sealing member 700 of Modification 2 configured as described above, the outer peripheral surface 704c is a covering material for the power supply cable 30 in the portion of the cylindrical portion 704 closer to the low-pressure environment region 300 than the O-ring contact portion 301. A differential pressure is generated in the direction of pressing against the outer surface of 33. Due to such differential pressure, the outer peripheral surface 704 c is deformed, and the unevenness 710 of the outer peripheral surface 704 c is pressed against the outer peripheral surface of the power supply cable 30.

The gap C1 between the outer side surface of the covering material 33 and the inner side surface of the outer peripheral surface 704c constituting the cylindrical portion 704 is eliminated by the press contact of the unevenness 710, and sealing is performed. In this modification, the outer peripheral surface 704c is sealed by bringing the O-ring member 110 into contact with the power feeding cable 30 in accordance with the deformation. For this reason, the sealing performance can be further improved.
The O-ring member 110 may be omitted if a sufficient sealing performance can be obtained by the press contact of the unevenness 710.
Other configurations and operational effects are the same as or equivalent to those of the embodiment, and thus the description thereof is omitted.

FIG. 15 is a perspective view of the sealing member 900 disposed in the connector, as viewed from the rear end side, in the power feeding connector of the pump according to the third modification of the embodiment.
In the sealing member 900 of the third modification, one composite tube portion 904 projects from the rear surface portion 902a of the rear tube portion 902.

In this composite cylinder portion 904, three openings 905 for cables are formed. These openings 905 are extended from the opening peripheral edge of the three insertion openings so as to be the positions of the respective apexes of the equilateral triangle.
A ring groove 905b is formed in the inner side surface of the tip of these openings 905, and the O-ring member 110 is attached to the ring groove 905b.

In the power supply connector of the pump according to the third modified example configured as described above, the outer surface of the covering member 33 of the power supply cable 30 is formed on the outer peripheral surface 904c of the composite cylindrical portion 904 by the pressure in the high pressure environment region 200 around the sealing member 900. A differential pressure in the direction of pressing against the pressure occurs. Due to such a differential pressure, the protruding portion of the composite cylinder portion 904 is deformed, and the contact pressure between the power supply cable 30 and the O-ring member 110 can be increased.
Other configurations and operational effects are the same as or equivalent to those of the embodiment, and thus the description thereof is omitted.

The present invention is not limited to the above-described embodiment, and various modifications can be made. The above-described embodiments are illustrated for easy understanding of the present invention, and are not necessarily limited to those having all the configurations described. Further, a part of the configuration of an embodiment can be replaced with the configuration of another embodiment, and the configuration of another embodiment can be added to the configuration of an embodiment. Further, it is possible to delete a part of the configuration of each embodiment, or to add or replace another configuration. Examples of possible modifications to the above embodiment are as follows.

In this embodiment, the sealing member 100 is constituted by a lead member having a lower rigidity than iron or the like. However, the present invention is not limited to this, and the sealing member 100 may be made of rubber or a resin member. In other words, the cylindrical portion 104 may be deformed by the pressure from the outer peripheral surface, and may have flexibility so that the space between the outer surface of the covering member 33 of the power supply cable 30 is airtight. For this reason, the shape of the sealing member 100, the quantity of the cylinder part 104, and a material are not specifically limited.

1 well 10 pump (downhole equipment)
15 Casing 20 Connector (Power connector)
30 Power supply cable (cable)
33 Coating material (outer peripheral surface)
50 Pot head 100, 500, 700, 900 Sealing member 102b Insertion hole 104, 504 Tube portion 104a End portion (tip portion)
104b, 505b 905b Ring groove 200 High pressure environment region 300 Low pressure environment region 710 Concavity and convexity 904 Composite tube

Claims (6)

1. The pump located in the high pressure region, a cable disposed so as to straddle the high pressure region from the low pressure region where the pressure is lower than the high pressure region,
   A pot head for connecting the pump with a metal terminal provided at the tip of the cable through the cable;
   A sealing member that is housed in the pot head and holds the inserted cable at a predetermined position of the pot head;
   The sealing member includes an insertion hole through which the cable is inserted, and a cylinder portion extending from the opening periphery of the insertion hole toward the low-pressure region,
   The pump connector according to claim 1, wherein the cylindrical portion is flexible by being deformed by pressure from an outer peripheral surface so as to be airtight between the outer surface of the cable.
2. The pump power supply connector according to claim 1, wherein an O-ring member that abuts on an outer surface of the cable is provided at an end portion in the cylindrical portion.
3. The power feeding connector for a pump according to claim 1, wherein the inner peripheral surface of the cylindrical portion is formed with irregularities that press against the outer surface of the cable.
4. 2. The power feeding connector for a pump according to claim 1, wherein the proximal end side of the cylindrical portion is formed thin so as to be more flexible than the distal end side.
5. The pump power connector according to claim 1, wherein the cylindrical portion is a composite cylindrical portion into which a plurality of cables are inserted.
6. 6. The downhaul apparatus having a power feeding connector according to claim 1, wherein power is fed from a power source provided on a ground surface to a pump submerged in a well using the cable. .

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