CN217984494U - Underground cable connection structure and electric submersible pump unit - Google Patents

Abstract

The utility model discloses an underground cable connection structure and oily charge pump unit of diving, include: box body, first binding post, linking cable, second binding post and lid. The utility model provides a connection structure passes through first interface, the second interface, first binding post, second binding post and linking up the cable and realized the electric connection between ground cable and the underground cable, the gas that will get into in the underground cable through the exhaust hole that sets up between first interface and second interface again is clean of discharging in the terminal handle box promptly, need not anxious inflammable gas passes through earth's surface cable and gets into the control screen, make the terminal handle box can locate to put or fix nearby in the well head, neither need make the soil foundation, need not put the terminal box in the position apart from well head 10 meters again, its requirement to installation environment has been reduced, the convenient operation nature of underground cable and earth's surface cable junction has been improved.

Description

Underground cable connection structure and electric submersible pump unit

Technical Field

The utility model relates to an oil development technical field especially relates to an underground cable connection structure and oily charge pump unit of diving.

Background

The electric submersible pump unit is a mechanical oil extraction device and is used for pumping underground liquid to the ground. The electric submersible pump unit mainly comprises three parts:

(1) A downhole part: the oil-submersible pump, the separator, the protector, the oil-submersible motor and the oil-submersible cable;

(2) Ground equipment:

and (3) fixed frequency driving: a step-down transformer and a control cabinet;

and (3) variable frequency driving: a step-down transformer, a frequency converter and a step-up transformer;

(3) Auxiliary equipment: centralizer, temperature measurement pressure measurement device, check valve, bleeder valve, well head pass through ware and terminal box.

In the power supply flow of the electric submersible pump, a junction box is arranged between the control screen and a wellhead; the junction box has two main functions:

1. the cable connecting the control screen to the wellhead, namely the cable coming out of the wellhead is connected to the junction box and then connected to the control screen by the junction box;

2. after the junction box is used, natural gas which rises to a wellhead from the oil-submersible cable core wire can be discharged, and the emptying effect is achieved, so that the control screen is prevented from exploding due to electric sparks after the natural gas directly enters the control screen. Therefore, a junction box must be used in the electrical submersible pump unit.

The invention patent application with application number 2020104233379 discloses a layered oil production process tubular column system and a method, as shown in fig. 1, comprising: the packer comprises a casing, an oil production string arranged in the casing and a packer 18, wherein the oil production string comprises a coiled tubing and an electric submersible screw pump, and the electric submersible screw pump is electrically connected with a control cabinet 13 through a cable and a ground junction box 14.

Similarly, utility model application No. 202023253408X discloses a connection structure of oil gas well liquid cable, as shown in fig. 2, it includes: the system comprises a butt joint structure 1 and a control mechanism 5, wherein the butt joint structure 1 and the control mechanism 5 are sequentially connected with a junction box 3 and a ground control special carrier power supply 4 in series through a power cable 2.

Although the above two technologies do not describe the related contents of the junction box in detail, it is not difficult to find out from the drawings that the technologies are still the conventional related technologies of the junction box; in this regard, the "standardization of oil production well site (station) site" article in chapter 2 electric pump well standardization site section 4 junction box is described as follows:

(1) The junction box has neat appearance and complete accessories, the front and back surfaces of the box body are provided with electric shock prevention safety marks, the grounding refers to the motor specification of the oil pumping unit, and the grounding resistance is less than 10 ohms;

(2) The bottom of the junction box is provided with a soil foundation with the size of 0.5m0.5m0.3m, and the junction box is stably and firmly placed;

(3) The junction box is 10-15m away from the wellhead and can not be over against the casing gate. The reason for this arrangement is to discharge gas that penetrates into the underground cable, preventing flammable gas in the well from entering the control screen, causing a fire or explosion.

It is not difficult to discover from above content that traditional terminal box adopts the box structure of ammeter, and is far away from well head position, and is higher to the installation environment requirement, leads to comparatively inconvenient when using.

It can be seen that there is a need for improvement and development in the art.

SUMMERY OF THE UTILITY MODEL

In view of above-mentioned prior art not enough, the utility model aims at providing an underground cable connection structure and latent oily electric pump unit aims at solving and is what the terminal box adopted is the box structure of ammeter box among the current oily electric pump unit of diving, and far away apart from the well head position, requires higherly to the installation environment, leads to the problem of comparatively inconvenience when using.

The utility model discloses technical scheme as follows:

an underground cable connection structure, comprising: a wire connection handle box, the wire connection handle box comprising: the box comprises a box body, a first wiring terminal, a joining cable, a second wiring terminal and a box cover, wherein a first interface and a second interface are respectively arranged at the upper end and the lower end of the box body; the box body is provided with an exhaust hole, and the exhaust hole is positioned between the first interface and the second interface and used for exhausting gas entering the underground cable.

The effect of above-mentioned scheme lies in: the utility model provides an underground cable connection structure passes through first interface, the second interface, first binding post, second binding post and linking up the cable and realized the electric connection between ground cable and the underground cable, gas in will getting into the underground cable through the exhaust hole that sets up between first interface and second interface again is clean of discharging in the wiring handle box promptly, need not anxious inflammable gas passes through earth's surface cable and gets into the control screen, make the wiring handle box can locate to put or fix nearby in the well head, neither need make the soil foundation, need not put the terminal box in the position apart from well head 10 meters again, its requirement to installation environment has been reduced, the convenient operation nature of underground cable and earth's surface cable junction has been improved.

In a further preferred aspect, the underground cable connection structure further includes: the box body fixed plate, the box body fixed plate with the connection can be dismantled to the wiring handle box and be connected for can dismantle the oil pipe side of connecting in well head department with the wiring handle box.

The effect of above-mentioned scheme lies in: just as the upper segment, the effect of box body fixed plate is in the oil pipe outside of wellhead department with the indirect fixed in of terminal handle box, for traditional terminal box, the utility model provides an underground cable connection structure is very big has shortened the distance between terminal handle box and the well head, no matter how submersible electric pump unit's installation environment is, right the utility model discloses a do not have the influence, submersible electric pump unit's convenient to use nature and commonality have obtained further improvement.

In a further preferred embodiment, two first bar-shaped fixing grooves are formed in the box fixing plate, and the underground cable connection structure further includes: the two ends of the first U-shaped fixing piece are provided with threads, and the two ends of the first U-shaped fixing piece penetrate through the two first strip-shaped fixing grooves respectively and then are connected with nuts; the wiring handle box extends towards one side of the wellhead to form an extension connecting pipe, and the extension connecting pipe is tightly pressed between the first U-shaped fixing piece and the box body fixing plate.

The effect of above-mentioned scheme lies in: the utility model adopts a movable connection structure, namely the relative position of the first U-shaped fixing piece and the box body fixing plate is not fixed, and the first U-shaped fixing piece can move back and forth along the first strip-shaped fixing groove so as to adjust the position of the first U-shaped fixing piece relative to the box body fixing plate; therefore, when the wiring handle box is connected with the box body fixing plate, the epitaxial connecting pipe is aligned and placed in the U-shaped groove of the first U-shaped fixing piece, then the two ends of the first U-shaped fixing piece penetrate through the two first strip-shaped fixing grooves respectively and are pre-tightened outside the oil production platform for preassembling, and finally when the device is assembled on site, the positions of the two ends of the first U-shaped fixing piece in the first strip-shaped fixing grooves are adjusted according to the position relation between the wellhead oil pipe and the wiring handle box, so that a large amount of installation time of an electric submersible pump unit spent on the oil production platform can be saved, the working efficiency is improved, and a large amount of rent money of the oil production platform is saved.

In a further preferred scheme, a limiting groove is formed in the outer edge of the extension connecting pipe, the inner wall of the first U-shaped fixing piece is attached to the bottom wall of the limiting groove, and the position of the first U-shaped fixing piece in the left-right direction is limited in the limiting groove.

The effect of above-mentioned scheme lies in: the effect of spacing groove is the position of restriction first U-shaped mounting for the binding post handle box, prevents that first U-shaped mounting from breaking away from with the epitaxial connecting pipe mutually, leads to underground cable and first binding post's interruption of being connected, takes place the incident.

In a further preferred scheme, two second bar fixed slots are opened on the box body fixing plate, the underground cable connection structure further comprises: two ends of the two second U-shaped fixing pieces are provided with threads, and the two second U-shaped fixing pieces respectively penetrate through the two second strip-shaped fixing grooves in a one-to-one correspondence mode and then are connected with nuts; the box body fixed plate is detachably connected to a wellhead oil pipe through the two second strip-shaped fixed grooves and the two second U-shaped fixing pieces.

The effect of above-mentioned scheme lies in: carry out the installation of box body fixed plate through above-mentioned structure, can utilize the second U-shaped mounting to cup joint the mode of accomplishing the fixed plate of box body rapidly at well head oil pipe outer wall on the one hand, on the other hand can be through setting up the box body fixed plate and the second U-shaped mounting of different model specifications (or, with the well head oil pipe of maximum specification as the standard, design box body fixed plate and second U-shaped mounting) in order to improve the utility model provides an underground cable connection structure's commonality.

In a further preferred aspect, the underground cable connection structure includes: the flexible cable comprises a rigid cable section and a flexible cable section, wherein the rigid cable section is arranged in the oil well; the flexible cable section penetrates through the wellhead, and two ends of the flexible cable section are connected with the first wiring terminal and the flexible cable section respectively.

The effect of above-mentioned scheme lies in: the rigid cable section is arranged in the oil well, and the oil well is vertically downward and does not need to be bent, so that the rigid cable section is favorable for the resistance of the cable to a high-temperature and high-pressure environment, and the service life and the service reliability of the cable are improved; the flexible cable section runs through the well head setting, if vertical then will make the terminal handle box too be close to oil pipe upwards, is unfavorable for the installation of terminal handle box on the one hand, and on the other hand can influence the oil recovery operation in well head position department, so the utility model discloses a when the armor of different characteristics is with the protection internal cable, improve underground cable connection structure's the installation effectiveness and the convenience of the oil recovery operation after the installation.

In a further preferred aspect, the underground cable connection structure further includes: the cable fixing seat is sleeved on the outer edge of the oil pipe and is provided with a penetrating hole, and the flexible cable section penetrates through the penetrating hole and then is connected with the rigid cable section.

The effect of above-mentioned scheme lies in: the main functions of the cable fixing seat are two: 1. the sleeve is sleeved on the outer edge of the oil pipe, and the oil pipe is placed to rock in the oil well; 2. the position reliability of the flexible cable section is improved, the flexible cable section is prevented from being changed in position after being impacted, the flexible cable section is prevented from being disconnected from the rigid cable section, and the safety of an oil well is improved.

In a further preferred scheme, the side of the cable fixing seat is provided with a tapered groove with a narrow inside and a wide outside along the circumferential direction, and the underground cable connection structure further comprises: the tail ends of the seat body fixing bolts are provided with conical seat body fixing parts which are used for penetrating into the conical grooves so that the cable fixing seats are clamped on the oil pipe seats sleeved on the outer edges of the cable fixing seats.

The effect of above-mentioned scheme lies in: for the screw rod and the screw hole of one-to-one correspondence, the connected mode of bell jar and pedestal fixed part does not need the one-to-one position, only need guarantee on the vertical direction cable fixing base with the oil pipe seat between the relative position can, greatly reduced the operation degree of difficulty, improved the assembly efficiency of cable fixing base and oil pipe seat.

In a further preferred aspect, the underground cable connection structure further includes: and the rigid cable section is bound on the outer side of the oil pipe through the cable strap.

The effect of above-mentioned scheme lies in: the rigid cable section bound on the outer side of the oil pipe through the cable strap can effectively prevent the impact of well fluid in an oil well.

An electric submersible pump unit comprises the underground cable connecting structure. Because the electric submersible pump unit comprises all the technical characteristics of the underground cable connection structure, the electric submersible pump unit also comprises all the technical effects of the underground cable connection structure, and the details are not repeated.

Compared with the prior art, the utility model provides an underground cable connection structure, include: the box comprises a box body, a first wiring terminal, a joining cable, a second wiring terminal and a box cover, wherein a first interface and a second interface are respectively arranged at the upper end and the lower end of the box body; the box body is provided with an exhaust hole, and the exhaust hole is positioned between the first interface and the second interface and used for exhausting gas entering the underground cable. The utility model provides a connection structure passes through first interface, the second interface, first binding post, second binding post and linking up the cable and realized the electric connection between ground cable and the underground cable, the gas that will get into in the underground cable through the exhaust hole that sets up between first interface and second interface again is clean of discharging in the terminal handle box promptly, need not anxious inflammable gas passes through earth's surface cable and gets into the control screen, make the terminal handle box can locate to put or fix nearby in the well head, neither need make the soil foundation, need not put the terminal box in the position apart from well head 10 meters again, its requirement to installation environment has been reduced, the convenient operation nature of underground cable and earth's surface cable junction has been improved.

Drawings

FIG. 1 is a schematic diagram of the structure of the layered oil recovery process string system disclosed in 2020104233379.

Fig. 2 is a schematic structural diagram of a connection structure of a liquid cable of an oil-gas well disclosed by 202023253408X.

Fig. 3 is a schematic structural diagram of the underground cable connection structure of the present invention.

Fig. 4 is a schematic structural diagram of the connection box body of the underground cable connection structure of the present invention.

Fig. 5 is an exploded view of the terminal box for the underground cable connection structure of the present invention.

Fig. 6 is a schematic view of the connection relationship between the box fixing plate and the first U-shaped fixing member and the second U-shaped fixing member for the underground cable connection structure of the present invention.

Fig. 7 is a schematic diagram of the position relationship between the oil pipe seat and the rigid cable section and the flexible cable section for the underground cable connection structure of the present invention.

Fig. 8 is a schematic diagram of the position relationship between the cable fixing seat and the seat fixing bolt used in the underground cable connection structure of the present invention.

Fig. 9 is a schematic structural view of the cable fixing seat used in the underground cable connection structure of the present invention.

Detailed Description

The utility model provides an underground cable connection structure and oily charge pump unit of diving, for making the utility model discloses a purpose, technical scheme and effect are clearer, make clear and definite, and it is right that the following refers to the drawing and lifts the example the utility model discloses further detailed description.

The utility model provides an underground cable connection structure, it includes: the connection handle box 100 indicates that connection handle box 100 size is less, is convenient for install and place (one of its concrete implementation structure is shown in fig. 3), certainly to its concrete shape, the utility model discloses not specifically inject, for traditional ammeter case formula electricity receiving box, the utility model provides a connection handle box 100 designs into miniaturized narrow limit structure, more is favorable to fixing in well head department, and can not influence the normal operating use of other equipment of well head department.

Preferably, as shown in fig. 5, the wire handle case 100 includes: a box body 150, a first connection terminal, a connection cable 170, a second connection terminal, and a box cover 160 (the connection terminals are prior art, and the present invention is not improved, and therefore not shown in the drawings), a first interface 110 and a second interface 120 are respectively disposed at the upper end and the lower end of the box body 150, as shown in fig. 4; the first connection terminal and the second connection terminal respectively penetrate through the first interface 110 and the second interface 120, the first connection terminal is used for connecting an underground cable, the second connection terminal is used for connecting an earth surface cable DBDL (shown in fig. 3), and two ends of the connection cable 170 are respectively and electrically connected with the first connection terminal and the second connection terminal; the box body 150 is provided with an exhaust hole 130, as shown in fig. 4; the vent hole 130 is located between the first interface 110 and the second interface 120, and is used for exhausting gas entering the underground cable. Preferably, an insulating sleeve is sleeved on an outer side of the connection cable 170 to improve insulation between the connection cables 170.

In an implementation, a sealing joint 180 is disposed at the second interface 120, as shown in fig. 5, to further improve the safety of the surface cable and the control screen.

The utility model provides an underground cable connection structure is through first interface 110, second interface 120, first binding post, second binding post and linking cable 170 have realized the electric connection between ground cable and the underground cable, gas that will get into in the underground cable through setting up exhaust hole 130 between first interface 110 and second interface 120 again is clean of discharging promptly in the handle for a telephone switchboard box 100, need not anxious inflammable gas passes through earth's surface cable DBDL entering control screen, make handle for a telephone switchboard box 100 can be in the wellhead department near put or fix, neither with the preparation soil foundation, need not put the terminal box in the position apart from the wellhead 10 meters again, its requirement to installation environment has been reduced, the convenient operation nature that underground cable and earth's surface cable DBDL are connected has been improved.

Through the explanation above, it is not difficult to discover the utility model provides an underground cable connection structure has solved that what terminal box adopted in the current electric pump unit that dives is the box structure of ammeter box, and is far away apart from the well head position, and is higher to the installation environment requirement, leads to the problem of comparatively inconvenience when using.

Preferably, the underground cable connection structure further comprises: as shown in fig. 3, the cartridge fixing plate 200 is detachably connected to the handle box 100, and is used to detachably connect the handle box 100 to the side of the oil pipe YG at the wellhead. Just as the upper paragraph, the effect of box body fixed plate 200 is in the oil pipe YG outside that the handle box 100 of will diving is indirectly fixed in well head department, for traditional terminal box, the utility model provides an underground cable connection structure is very big has shortened the distance between handle box 100 of diving and the well head, no matter how the installation environment of the electric pump unit of diving, to the utility model discloses it is all free of influence, the convenient to use nature and the commonality of the electric pump unit of diving have obtained further improvement.

Preferably, as shown in fig. 3, two first bar-shaped fixing slots 210 are formed in the box fixing plate 200, and the underground cable connection structure further includes: a first U-shaped fixing member 300, as shown in fig. 6; both ends of the first U-shaped fixing member 300 are provided with threads, and both ends of the first U-shaped fixing member 300 are connected with nuts LM after passing through the two first bar-shaped fixing grooves 210, respectively, as shown in fig. 6; an extension connecting pipe 140 (shown in fig. 3 and 4) extends from the side of the terminal handle case 100 facing the wellhead, and the extension connecting pipe 140 is compressed between the first U-shaped fixing member 300 and the case fixing plate 200.

The utility model adopts a movable connection structure, that is, the relative position of the first U-shaped fixing member 300 and the box body fixing plate 200 is not fixed, and the first U-shaped fixing member can move back and forth along the first strip-shaped fixing groove 210 to adjust the position of the first U-shaped fixing member relative to the box body fixing plate 200; therefore, when the connection handle box 100 is connected with the box body fixing plate 200, the extension connecting pipe 140 is aligned and placed in the U-shaped groove of the first U-shaped fixing member 300, then the two ends of the first U-shaped fixing member 300 respectively penetrate through the two first bar-shaped fixing grooves 210 and are pre-tightened outside the oil production platform for preassembling, and finally, when the assembly is carried out on site, the positions of the two ends of the first U-shaped fixing member 300 in the first bar-shaped fixing grooves 210 are adjusted according to the position relationship between the wellhead oil pipe YG and the connection handle box 100, so that a large amount of time for installing the submersible electric pump unit on the oil production platform can be saved, the working efficiency is improved, and a large amount of rent money of the oil production platform is saved. It should be noted that the rent of the oil production platform is about 50 yuan/sec on average, if a soil foundation with the size of 0.5m 0.3m needs to be manufactured on site according to a traditional junction box wiring method, then a wiring mode of a surface cable DBDL between a junction box and an underground cable is designed, the whole process is time-consuming, the working efficiency is reduced, and a large amount of rent of the oil production platform needs to be wasted.

Specifically, a limiting groove is formed in the outer edge of the epitaxial connecting tube 140, the inner wall of the first U-shaped fixing member 300 is attached to the bottom wall of the limiting groove, and the position of the first U-shaped fixing member 300 in the left-right direction is limited in the limiting groove. The limiting groove is used for limiting the position of the first U-shaped fixing member 300 relative to the wiring handle box 100, and preventing the first U-shaped fixing member 300 from being separated from the epitaxial connecting pipe 140, which causes the connection between the underground cable and the first wiring terminal to be interrupted, and causes safety accidents.

In specific implementation, the limiting groove is formed in various ways, and a groove is directly machined on the outer wall of the epitaxial connecting pipe 140; secondly, a step is processed on the outer wall of the epitaxial connecting pipe 140, and a ring body in interference fit with the epitaxial connecting pipe 140 is sleeved on one side opposite to the step; its three, establish two that separate on the outer wall of extension connecting pipe 140 and all with extension connecting pipe 140 interference fit's ring body etc. these all belong to the utility model discloses ground protection scope no longer gives unnecessary details one by one.

As shown in fig. 3, two second strip-shaped fixing slots 220 are formed in the box fixing plate 200, and the underground cable connection structure further includes: two second U-shaped fixing members 400, as shown in fig. 3 and 6; both ends of the two second U-shaped fixing members 400 are provided with threads, and the two second U-shaped fixing members 400 are connected with nuts LM after passing through the two second strip-shaped fixing grooves 220 one by one respectively; the cartridge body fixing plate 200 is detachably coupled to the wellhead oil pipe YG through the two second bar-shaped fixing grooves 220 and the two second U-shaped fixing members 400. Carry out the installation of box body fixed plate 200 through above-mentioned structure, can utilize second U-shaped mounting 400 to cup joint the mode of accomplishing box body fixed plate 200 rapidly at well head oil pipe YG outer wall on the one hand, on the other hand can be through setting up the box body fixed plate 200 and the fixed 400 of second U-shaped mounting of different model specifications (or, as the standard, design box body fixed plate 200 and second U-shaped mounting 400) in order to improve with the well head oil pipe YG of maximum specification the utility model provides an underground cable connection structure's commonality.

It should be noted that although the first bar-shaped fixing groove 210 and the first U-shaped fixing member 300 have a similar configuration to the second bar-shaped fixing groove 220 and the second U-shaped fixing member 400, the two members have different effects, the first bar-shaped fixing groove 210 and the first U-shaped fixing member 300 are mainly disposed to enable the pre-installation of the handle box 100 and the box body fixing plate 200, and the second bar-shaped fixing groove 220 and the second U-shaped fixing member 400 are disposed to improve the versatility of the underground cable connection structure.

According to another aspect of the present invention, the underground cable connection structure includes: a rigid cable segment 600 (shown in fig. 7) and a flexible cable segment 500 (shown in fig. 3), the rigid cable segment 600 being disposed in a well; the flexible cable section 500 penetrates through a wellhead, and two ends of the flexible cable section are respectively connected with the first wiring terminal and the flexible cable section 500. The rigid cable section 600 is arranged in the oil well, and the oil well is vertically downward and does not need to be bent, so that the rigid cable section 600 is beneficial to the resistance of the cable to high-temperature and high-pressure environments, and the service life and the use reliability of the cable are improved; the flexible cable section 500 runs through the well head setting, if vertical then will make the terminal handle box 100 too be close to oil pipe YG upwards, is unfavorable for the installation of terminal handle box 100 on the one hand (all adopt the rigidity armour with the position of very big restriction terminal handle box 100, certain oil well can not necessarily satisfy the installation condition), and on the other hand can influence the oil recovery operation in well head position department, so the utility model discloses a when the armour of different characteristics is with the protection internal cable, improve underground cable connection structure's the installation effectiveness and the convenience of the oil recovery operation after the installation. As mentioned above, the difference between the rigid cable segment 600 and the flexible cable segment 500 is the outer armor (also referred to as jacket), in particular the armor material, the present invention is not limited. Preferably, the underground cable connection structure further includes: and the rigid cable section 600 is bound on the outer side of the oil pipe YG through the cable strap. The impact of well fluid in the oil well can be effectively prevented by the rigid cable section 600 bound to the outside of the oil pipe YG by the cable strap.

Further, the underground cable connection structure further includes: as shown in fig. 8 and 9, the cable fixing seat 900 is sleeved on the outer edge of the oil pipe YG and is provided with a through hole, and the flexible cable section 500 is connected to the rigid cable section 600 after passing through the through hole. The cable mount 900 has two main functions: 1. the cable fixing seat 900 is sleeved on the outer edge of the oil pipe YG, and the oil pipe YG is placed to rock in an oil well (the length of the oil pipe YG is hundreds of meters, the length of the oil pipe YG is more than thousands of meters, and if the rocking amplitude is too large, the oil pipe YG is easy to break or damage); 2. the position reliability of the flexible cable segment 500 is improved, the flexible cable segment 500 is prevented from being changed in position after being impacted, the phenomenon that the flexible cable segment is disconnected from the rigid cable segment 600 is caused, and the safety of an oil well is improved.

Further, the side surface of the cable fixing seat 900 is provided with a tapered groove 910 (as shown in fig. 9) with a narrow inside and a wide outside along the circumferential direction, and the underground cable connection structure further includes: a plurality of seat fixing bolts 800 (as shown in fig. 7 and 8), a conical seat fixing portion is disposed at a tail end of the seat fixing bolt 800, and the seat fixing portion is used to penetrate into the tapered groove 910 so that the cable fixing seat 900 is clamped on the oil pipe seat 700 (as shown in fig. 7) disposed at an outer edge of the cable fixing seat 900. For the screws and the screw holes corresponding to each other, the connection mode of the tapered groove 910 and the seat body fixing portion does not need to correspond to each other, and only the relative position between the cable fixing seat 900 and the oil pipe seat 700 in the vertical direction needs to be ensured, so that the operation difficulty is greatly reduced, and the assembly efficiency of the cable fixing seat 900 and the oil pipe seat 700 is improved.

The utility model also provides an electrical submersible pump unit, it includes as above underground cable junction structure. Because the electric submersible pump unit comprises all the technical characteristics of the underground cable connection structure, the electric submersible pump unit also comprises all the technical effects of the underground cable connection structure, and the details are not repeated.

It should be noted that the above-mentioned embodiments illustrate rather than limit the invention, and that those skilled in the art will be able to design alternative embodiments without departing from the scope of the appended claims. In the claims, any reference signs placed between parentheses shall not be construed as limiting the claim. The word "comprising" does not exclude the presence of elements or steps not listed in a claim. The word "a" or "an" preceding an element does not exclude the presence of a plurality of such elements. The invention can be implemented by means of hardware comprising several distinct elements, and by means of a suitably programmed computer. In the unit claims enumerating several means, several of these means may be embodied by one and the same item of hardware. The usage of the words first, second and third, etcetera do not indicate any ordering. These words may be interpreted as names. The steps in the above embodiments should not be construed as limited to the order of execution unless otherwise specified.

Claims (10)

1. An underground cable connection structure, comprising: a wire-connecting handle box, said wire-connecting handle box comprising: the box comprises a box body, a first wiring terminal, a joining cable, a second wiring terminal and a box cover, wherein a first interface and a second interface are respectively arranged at the upper end and the lower end of the box body; the box body is provided with an exhaust hole, and the exhaust hole is positioned between the first interface and the second interface and used for exhausting gas entering the underground cable.

2. An underground cable connection structure according to claim 1, further comprising: the box body fixed plate, the box body fixed plate with the connection can be dismantled to the wiring handle box and be connected for can dismantle the oil pipe side of connecting in well head department with the wiring handle box.

3. An underground cable connecting structure as claimed in claim 2, wherein the box fixing plate is provided with two first bar-shaped fixing slots, and the underground cable connecting structure further comprises: the two ends of the first U-shaped fixing piece are provided with threads, and the two ends of the first U-shaped fixing piece penetrate through the two first strip-shaped fixing grooves respectively and then are connected with nuts; the wiring handle box extends towards one side of the wellhead to form an extension connecting pipe, and the extension connecting pipe is tightly pressed between the first U-shaped fixing piece and the box body fixing plate.

4. An underground cable connection structure as claimed in claim 3, wherein the outer edge of the extension connecting pipe is provided with a limiting groove, the inner wall of the first U-shaped fixing member is attached to the bottom wall of the limiting groove, and the position of the first U-shaped fixing member in the left-right direction is limited in the limiting groove.

5. An underground cable connection structure as claimed in claim 2, wherein the box fixing plate has two second strip-shaped fixing slots formed therein, and the underground cable connection structure further comprises: two ends of the two second U-shaped fixing pieces are provided with threads, and the two second U-shaped fixing pieces respectively penetrate through the two second strip-shaped fixing grooves in a one-to-one correspondence mode and then are connected with nuts; the box body fixed plate is detachably connected to a wellhead oil pipe through the two second strip-shaped fixed grooves and the two second U-shaped fixing pieces.

6. An underground cable connection structure according to claim 1, comprising: the flexible cable comprises a rigid cable section and a flexible cable section, wherein the rigid cable section is arranged in the oil well; the flexible cable section penetrates through the wellhead, and two ends of the flexible cable section are connected with the first wiring terminal and the flexible cable section respectively.

7. An underground cable connection structure according to claim 6, further comprising: the cable fixing seat is sleeved on the outer edge of the oil pipe and is provided with a penetrating hole, and the flexible cable section penetrates through the penetrating hole and then is connected with the rigid cable section.

8. An underground cable connection structure as claimed in claim 7, wherein the side surface of the cable fixing seat is provided with a tapered groove with a narrow inside and a wide outside along the circumferential direction, and the underground cable connection structure further comprises: the tail ends of the seat body fixing bolts are provided with conical seat body fixing parts which are used for penetrating into the conical grooves so that the cable fixing seats are clamped on the oil pipe seats sleeved on the outer edges of the cable fixing seats.

9. An underground cable connection structure according to claim 6, further comprising: and the rigid cable section is bound on the outer side of the oil pipe through the cable strap.

10. An electrical submersible pump assembly, characterized in that it comprises an underground cable connection structure according to any one of claims 1 to 9.

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