CN215907831U

CN215907831U - Cable-free cable-connected intelligent layered water injection pipe column connecting structure

Info

Publication number: CN215907831U
Application number: CN202121381732.1U
Authority: CN
Inventors: 刘春香
Original assignee: Tianjin Huayu Bochuang Petroleum Technology Development Co ltd
Current assignee: Tianjin Huayu Bochuang Petroleum Technology Development Co ltd
Priority date: 2021-06-21
Filing date: 2021-06-21
Publication date: 2022-02-25
Anticipated expiration: 2031-06-21

Abstract

The utility model aims to provide a cable-free intelligent layered water injection pipe column connecting structure, which is characterized in that: the water distribution assembly comprises an upper oil pipe, an upper cable, an upper sealing water distribution assembly, a connecting cable, an oil pipe, a lower sealing water distribution assembly, a tail pipe and a plug, wherein the upper sealing water distribution assembly comprises a short-circuit part, an encapsulation structure, a packer, an intelligent water distributor, two electric wires and a steel pipe cable, the encapsulation structure comprises a cable sealing hole, a sealing joint, two sealing rings, two check rings and a filling layer, the structure of the lower sealing water distribution assembly is basically the same as that of the upper sealing water distribution assembly, the packer and the intelligent water distributor are directly connected in a workshop to form an assembly, a small-end cable is prefabricated inside the packer, so that power and communication are provided for a water distributor, the reliability of the whole process is improved, the traditional cable joint is replaced, the construction success rate and the service life of the intelligent well can be greatly improved, the construction difficulty is greatly reduced, the field operation period is saved, and the working efficiency is improved.

Description

Cable-free cable-connected intelligent layered water injection pipe column connecting structure

Technical Field

The utility model relates to the technical field of oil extraction in the oil field industry, in particular to a cable-free intelligent layered water injection pipe column connecting structure.

Background

Under the large background of oil field digital transformation, oil field production gradually develops towards the intelligent and digital directions. Intelligent water injection characterized by underground intelligent mining, real-time monitoring and automatic control has gradually begun to be popularized and applied in various oil fields. Currently, the relatively common downhole smart well is generally divided into three directions: three kinds of have cable intelligence water injection, hydraulic pressure intelligence water injection and wireless intelligence water injection. The intelligent water injection technology with the cable has the characteristics of high intelligent degree, ground underground joint debugging at any time and the like, and the application range is widest.

The cable intelligent water injection technology needs to connect the underground intelligent water distributor to the ground by using one cable and transmit power and signals through the cable. The intelligent process technologies need to carry out zonal mining, tools for interlayer isolation, such as a packer and a sealing plug, which are commonly used in the industry, are required to be used, when a cable passes through the interlayer isolation tools, the cable needs to be cut off, and the two cut-off cables are connected by using a cable joint, so that the smoothness of electric power and communication is ensured.

In the prior art, in the running process of a pipe column, a packer in each interval is directly connected with an intelligent water distributor at a well head or is connected through an oil pipe short circuit and then is sequentially run into a well, and a cable between the packer and the intelligent water distributor is connected through a cable joint; in the aspect of electric power and communication connection of the water distributor between the intervals, the two sections of cables are still connected by cable joints to realize transmission of electric power and communication; at present, a common separate injection layer section of a cabled intelligent water injection technology is 3-6 layers, 6-12 cable joints are needed, failure of electric power and communication of the whole tubular column can be caused by failure of any cable joint, a slender cylinder is formed outside the cable joint and is fixed outside an oil pipe through a steel belt or a cable protector, the size of the local outer diameter is large, the tubular column is easy to be hung and bumped when being lifted and lowered, and the electric power and communication of the whole tubular column are influenced; in summary, the existing connection structure of the cable intelligent layered water injection pipe column needs to be improved to solve and avoid the problems encountered in the actual construction operation.

SUMMERY OF THE UTILITY MODEL

The utility model aims to provide a cable connection applied to a cabled intelligent water injection well, which adopts a mode that a packer and an intelligent water distributor are directly connected in a workshop to form an assembly, and a small-end cable is prefabricated in the packer to provide power and communication for the water distributor, so that a cable joint connected with a tool in each layer section is eliminated, the reliability of the whole process is further improved, the design idea that the cable is directly connected with a downhole tool is fully utilized to replace the traditional cable joint, the construction success rate and the service life of the intelligent well can be greatly improved, the difficulty of field construction is greatly reduced, the field operation period is saved, and the working efficiency is improved.

The technical scheme of the utility model is as follows: the utility model provides a there is cable intelligence layering water injection tubular column's connection structure of no cable joint which characterized in that: the water distribution device comprises an upper oil pipe, an upper cable, an upper sealing water distribution assembly, a connecting cable, an oil pipe, a lower sealing water distribution assembly, a tail pipe and a plug, wherein the upper oil pipe and the upper cable are all positioned at the upper part of the sealing water distribution assembly, the upper oil pipe and the upper cable are both connected with the upper sealing water distribution assembly, the upper sealing water distribution assembly comprises a short-circuit component, an encapsulation structure, a packer, an intelligent water distributor, two electric wires and a steel pipe cable, the short-circuit component is fixedly connected with the upper oil pipe, the encapsulation structure is positioned at the connecting position of the upper cable and the short-circuit component, the encapsulation structure comprises a cable sealing hole, a sealing joint, two sealing rings, two check rings and a filling layer, the cable sealing hole is positioned at the connecting position of the upper cable and the short-circuit component, the cable sealing hole is fixedly connected with the short-circuit component, and one end of the upper cable is inserted into the cable sealing hole, the sealing joint is positioned at the connecting position of the upper cable and the cable sealing hole, the sealing joint is positioned at the upper part of the cable sealing hole, one end of the sealing joint is fixedly connected with the upper cable, the other end of the sealing joint is detachably connected with the cable sealing hole, the two sealing rings and the two check rings are positioned at the connecting position of the upper cable and the cable sealing hole in a staggered and superposed structure, the sealing rings and the two check rings are all positioned at the inner sides of the cable sealing hole, the sealing rings and the two check rings are detachably connected with the cable sealing hole, the filling layer is positioned inside the cable sealing hole, the filling layer is connected with the cable sealing hole, the packer is positioned at the lower part of the short-circuit part, the packer is fixedly connected with the short-circuit part, the intelligent water distributor is positioned at the lower part of the packer, and the intelligent water distributor is fixedly connected with the packer, the two electric wires are respectively positioned at the inner sides of the short-circuit component and the intelligent water distributor, the two electric wires are fixedly connected with the short-circuit component and the intelligent water distributor, the steel pipe cable is positioned at the inner side of the packer, the steel pipe cable is fixedly connected with the packer, one end of the first electric wire penetrates through the cable sealing hole and is connected with the upper cable, the other end of the first electric wire is connected with the steel pipe cable, one end of the second electric wire is connected with the steel pipe cable, the other end of the second electric wire is connected with the connecting cable, the connecting cable and the oil pipe are positioned between the upper sealed water distribution assembly and the lower sealed water distribution assembly, one end of the connecting cable is connected with the upper sealed water distribution assembly, the other end of the connecting cable is connected with the lower sealed water distribution assembly, one end of the oil pipe is connected with the upper sealed water distribution assembly, and the other end of the oil pipe is connected with the lower sealed water distribution assembly, the tail pipe is located at the lower part of the lower sealed water distribution assembly and connected with the lower sealed water distribution assembly, the plug is located at the lower part of the tail pipe, and the plug is connected with the tail pipe.

Further, the cable sealing holes are all circular hole structures.

Further, the sealing joints are all stainless steel sealing elements.

Further, the sealing rings are all rubber rings.

Furthermore, the retainer ring is a stainless steel ring or a hard plastic ring.

Furthermore, the filling layer is sealant.

Further, the lower sealed water distribution assembly comprises a short-circuit component, an encapsulation structure, a packer, an intelligent water distributor, an electric wire and a steel pipe cable, the encapsulation structure of the lower sealed water distribution assembly also comprises a cable sealing hole, a sealing joint, two sealing rings, two check rings and a filling layer, the other end of the connecting cable is inserted into the cable sealing hole in the short-circuit component of the lower sealed water distribution assembly, and the other end of the connecting cable is connected with the cable sealing hole in the short-circuit component of the lower sealed water distribution assembly by the encapsulation structure.

The utility model has the beneficial effects that: this there is cable intelligence layering water injection tubular column structure of no cable joint mainly uses the cable junction in having cable intelligence water injection well, adopt the packer, the mode that intelligent water injection mandrel lug connection is the assembly in the workshop, and at the inside prefabricated little end cable of packer, provide electric power and communication for the water injection mandrel, the cable joint that the inside instrument of each layer section is connected has been cancelled, and then improve the reliability of whole technology, make full use of cable and instrument lug connection's in the pit design thinking, replace traditional cable joint, can increase substantially the construction success rate and the life of intelligent well, reduce substantially the degree of difficulty of site operation simultaneously, save the field operation cycle, improve work efficiency.

Drawings

Fig. 1 is a front view of the present invention.

Fig. 2 is an enlarged cross-sectional view of the package structure of the present invention.

Fig. 3 is a schematic structural view of an upper seal water distribution assembly of the present invention.

Fig. 4 is a schematic view of the structure of the lower seal water distribution assembly of the present invention.

Wherein: 1. go up oil pipe 2, go up cable 3, go up sealed water distribution assembly

4. Short-circuit component 5, packaging structure 6 and cable sealing hole

7. Sealing joint 8, sealing ring 9 and retainer ring

10. Filling layer 11, packer 12 and intelligent water distributor

13. Electric wire 14, steel pipe cable 15, connecting cable

16. Oil pipe 17, lower sealing water distribution assembly 18 and tail pipe

19. Pipe plug

Detailed Description

The following provides a brief description of embodiments of the present invention with reference to the accompanying drawings.

As shown in fig. 1, fig. 2, fig. 3 and fig. 4, the connecting structure of the cable-free intelligent layered water injection pipe column without the cable joint is characterized in that: the water distribution device is composed of an upper oil pipe 1, an upper cable 2, an upper sealed water distribution assembly 3, a connecting cable 15, an oil pipe 16, a lower sealed water distribution assembly 17, a tail pipe 18 and a plug 19, wherein the upper oil pipe 1 and the upper cable 2 are all positioned at the upper part of the sealed water distribution assembly 3, the upper oil pipe 1 and the upper cable 2 are both connected with the upper sealed water distribution assembly 3, the upper sealed water distribution assembly 3 comprises a short-circuit component 4, an encapsulation structure 5, a packer 11, an intelligent water distributor 12, two electric wires 13 and a steel pipe cable 14, the short-circuit component 4 is fixedly connected with the upper oil pipe 1, the encapsulation structure 5 is positioned at the connecting position of the upper cable 2 and the short-circuit component 4, the encapsulation structure 5 comprises a cable sealing hole 6, a sealing joint 7, two sealing rings 8, two check rings 9 and a filling layer 10, the cable sealing hole 6 is positioned at the connecting position of the upper cable 2 and the short-circuit component 4, the cable sealing hole 6 is fixedly connected with the short-circuit component 4, one end of the upper cable 2 is inserted into the cable sealing hole 6, the sealing joint 7 is positioned at the connecting position of the upper cable 2 and the cable sealing hole 6, the sealing joint 7 is positioned at the upper part of the cable sealing hole 6, one end of the sealing joint 7 is fixedly connected with the upper cable 2, the other end of the sealing joint 7 is detachably connected with the cable sealing hole 6, the two sealing rings 8 and the two check rings 9 are positioned at the connecting position of the upper cable 2 and the cable sealing hole 6 in a staggered and superposed structure, the sealing rings 8 and the two check rings 9 are all positioned at the inner side of the cable sealing hole 6, the sealing rings 8 and the two check rings 9 are detachably connected with the cable sealing hole 6, the filling layer 10 is positioned inside the cable sealing hole 6, and the filling layer 10 is connected with the cable sealing hole 6, the packer 11 is located at the lower part of the short-circuit component 4, the packer 11 is fixedly connected with the short-circuit component 4, the intelligent water distributor 12 is located at the lower part of the packer 11, the intelligent water distributor 12 is fixedly connected with the packer 11, the two electric wires 13 are respectively located at the inner sides of the short-circuit component 4 and the intelligent water distributor 12, both the two electric wires 13 are fixedly connected with the short-circuit component 4 and the intelligent water distributor 12, the steel pipe cable 14 is located at the inner side of the packer 11, the steel pipe cable 14 is fixedly connected with the packer 11, one end of the first electric wire 13 penetrates through the cable sealing hole 6 and is connected with the upper cable 2, the other end of the first electric wire 13 is connected with the steel pipe cable 14, one end of the second electric wire 13 is connected with the steel pipe cable 14, the other end of the second electric wire 13 is connected with the connecting cable 15, and the connecting cable 15, The oil pipe 16 is located at a position between the upper sealed water distribution assembly 3 and the lower sealed water distribution assembly 17, one end of the connecting cable 15 is connected with the upper sealed water distribution assembly 3, the other end of the connecting cable 15 is connected with the lower sealed water distribution assembly 17, one end of the oil pipe 16 is connected with the upper sealed water distribution assembly 3, the other end of the oil pipe 16 is connected with the lower sealed water distribution assembly 17, the lower sealed water distribution assembly 17 comprises a short-circuit component 4, an encapsulation structure 5, a packer 11, an intelligent water distributor 12, an electric wire 13 and a steel pipe cable 14, the encapsulation structure 5 of the lower sealed water distribution assembly 17 also comprises a cable sealing hole 6, a sealing joint 7, two sealing rings 8, two check rings 9 and a filling layer 10, the other end of the connecting cable 15 is inserted into the cable sealing hole 6 in the short-circuit component 4 of the lower sealed water distribution assembly 17, and the other end of the connecting cable 15 is connected with the short-circuit component 4 of the lower sealed water distribution assembly 17 by the encapsulation structure 5 The tail pipe 18 is positioned at the lower part of the lower sealing water distribution assembly 17, the tail pipe 18 is connected with the lower sealing water distribution assembly 17, the plug 19 is positioned at the lower part of the tail pipe 18, and the plug 19 is connected with the tail pipe 18. The cable sealing holes 6 are all circular hole structures. The sealing joints 7 are all stainless steel sealing elements. The sealing rings 8 are all rubber rings. The retainer ring 9 is a stainless steel ring or a hard plastic ring. The filling layer 10 is sealant.

The working mode is as follows: the cable-free intelligent separate-layer water injection pipe column structure is mainly applied to cable connection in a cable-free intelligent water injection well, and integrally comprises an upper oil pipe 1, an upper cable 2, an upper sealing water distribution assembly 3, a connecting cable 15, an oil pipe 16, a lower sealing water distribution assembly 17, a tail pipe 18 and a plug 19, wherein the upper sealing water distribution assembly 3 comprises a short-circuit part 4, an encapsulation structure 5, a packer 11, an intelligent water distributor 12, two electric wires 13 and a steel pipe cable 14, the structure of the lower sealing water distribution assembly 17 is basically the same as that of the upper sealing water distribution assembly 3, the lower sealing water distribution assembly 17 also comprises a short-circuit part 4, an encapsulation structure 5, a packer 11, an intelligent water distributor 12, an electric wire 13 and a steel pipe cable 14, the connecting structure of the integral pipe column is that the plug 19 is connected with the tail pipe 18, the tail pipe 18 is connected with the lower sealing water distribution assembly 17, the upper end of the lower sealing water distribution assembly 17 is connected with the lower end of the oil pipe 16, the upper end of the oil pipe 16 is connected with the lower end of the upper sealed water distribution assembly 3, and the upper end of the upper sealed water distribution assembly 3 is connected with the upper oil pipe 1, so that the upper oil pipe 1, the upper sealed water distribution assembly 3, the connecting cable 15, the oil pipe 16, the lower sealed water distribution assembly 17, the tail pipe 18 and the plug 19 form a group of series structures; in addition, the packaging structure 5 comprises a cable sealing hole 6, a sealing joint 7, two sealing rings 8, two check rings 9 and a filling layer 10, during assembly, the lower end of a connecting cable 15 is inserted into the cable sealing hole 6 of the lower sealing water distribution assembly 17, glue is injected into the cable sealing hole 6 to form the filling layer 10, the filling layer 10 adopts sealant, the inserted connecting cable 15 can be sealed, filled and fixed, the cable sealing hole 6 adopts a circular hole structure, so that the insertion of a circuit and a cable is facilitated, the two sealing rings 8 and the two check rings 9 are sleeved outside the lower end of the connecting cable 15 in a staggered and superposed structure and extend into the cable sealing hole 6 of the lower sealing water distribution assembly 17 to be plugged, the sealing rings 8 are rubber rings, the check rings 9 are stainless steel rings or hard plastic rings, the two sealing rings 8 and the two check rings 9 are overlapped and matched in a staggered mode to play a role in strengthening sealing, and the sealing reliability can be enhanced by the multi-stage combination mode; then, the sealing joint 7 is used for sealing and fixing the connecting end of the connecting cable 15 and the cable sealing hole 6 of the lower sealing water distribution assembly 17, and the sealing joint 7 adopts a stainless steel sealing piece to protect the connecting part and prevent collision; similarly, the assembly of the upper sealed water distribution assembly 3 is also to insert the lower end of the upper cable 2 into the cable sealing hole 6 of the upper sealed water distribution assembly 3, and glue is injected into the cable sealing hole 6 to form a filling layer 10, which can play a role in sealing, filling and fixing the inserted upper cable 2, two sealing rings 8 and two check rings 9 are sleeved outside the lower end of the upper cable 2, the two sealing rings 8 and the two check rings 9 are also sleeved outside the lower end of the upper cable 2 in a staggered and superposed structure, and extend into the cable sealing hole 6 of the upper sealed water distribution assembly 3 to be plugged, and then the sealing joint 7 is used for sealing and fixing the connecting end of the upper cable 2 and the cable sealing hole 6 of the upper sealed water distribution assembly 3.

During construction operation, a lower sealed water distribution assembly 17 and an upper sealed water distribution assembly 3 are sequentially inserted, assembly bodies are connected through an oil pipe 16, the upper end of a connecting cable 15 is directly inserted into the upper sealed water distribution assembly 3, the lower end of the connecting cable 15 is directly inserted into the lower sealed water distribution assembly 17, the upper end of the upper sealed water distribution assembly 3 is connected through an upper oil pipe 1, and the lower end of an upper cable 2 is directly inserted into the sealed water distribution assembly 3; the whole upper sealed water distribution assembly 3 and the lower sealed water distribution assembly 17 are not installed at well mouths, but before the construction operation of the upper well, the upper sealed water distribution assembly 3 and the lower sealed water distribution assembly 17 are installed well in advance in a ground workshop and then are conveyed to the upper part of the well, the short-circuit component 4 is connected with the steel pipe cable 14, the connection structure and the mode of the short-circuit component are the same as the structure of the packaging structure 5, the steel pipe cable 14 penetrates through the inner drift diameter of the packer 11 and then is connected with the intelligent water distributor 12, the connection structure and the mode of the short-circuit component are the same as the structure of the packaging structure 5, the steel pipe cable 14 with a shorter end is prefabricated in the respective packer 11 of the upper sealed water distribution assembly 3 and the lower sealed water distribution assembly 17, electric wires 13 are respectively arranged at two ends of the packer 11 in the upper sealed water distribution assembly 3, the steel pipe cable 14 in the upper sealed water distribution assembly 3 is connected, and the steel pipe cable 14 penetrates through the interior of the packer 11, the connection is positioned in the tool, so that the risk of colliding the lower pipe column is avoided, and the reliability of cable connection is greatly improved; an upper end wire 13 of the steel pipe cable 14 is connected with an upper cable 2 inserted into the cable sealing hole 6 in the upper sealing water distribution assembly 3, and a lower end wire 13 of the steel pipe cable 14 is connected with a connecting cable 15 and used for transmitting electric power and communication between the intelligent water distributor 12 and the short-circuit component 4; similarly, an electric wire 13 is arranged at the upper end of the packer 11 in the lower sealed water distribution assembly 17, a steel pipe cable 14 in the lower sealed water distribution assembly 17 is connected, and the electric wire 13 at the upper end of the steel pipe cable 14 is connected with a connecting cable 15 inserted into the cable sealing hole 6 in the lower sealed water distribution assembly 17; a section of longer cable, namely the upper cable 2 and the connecting cable 15, is prefabricated on the upper parts of the upper sealed water distribution assembly 3 and the lower sealed water distribution assembly 17; in addition, the steel pipe cables 14 prefabricated in the respective packers 11 of the upper sealing water distribution assembly 3 and the lower sealing water distribution assembly 17 are connected in a workshop, and compared with a well site environment, the workshop has a good working environment and is convenient for construction operation, so that the sealing reliability after connection is higher; the mode of prefabricating the cable in a workshop is adopted, so that the number of cable joints is reduced by 50% during underground operation; the packer 11 is fixed with the intelligent water distributor 12, the intelligent water distributor 12 of the upper sealing water distribution assembly 3 is connected with the upper end of the connecting cable 15, the connecting structure and the connecting mode are the same as the structure of the packaging structure 5, and the electric wires 13 arranged in the upper sealing water distribution assembly 3 and the lower sealing water distribution assembly 17 are responsible for connecting the connecting cable 15 and the upper cable 12 together to form a series structure so as to transmit electric power and communicate.

Wholly adopt the packer, the mode that intelligent water injection mandrel lug connection was the assembly in the workshop, and at the inside prefabricated small-end cable of packer, provide electric power and communication for the water injection mandrel, at the inside prefabricated one section of the section intelligent water injection mandrel of adjacent layer and the equal length's of interval distance cable, after accomplishing the connection of instrument body and oil pipe, with this section prefabricated cable tip disect insertion adjacent sealed water distribution assembly inside, the cable joint of the inside tool connection of each interval has been cancelled, and then improve the reliability of whole technology, make full use of cable and downhole tool lug connection's design thinking, replace traditional cable joint, can increase substantially the construction success rate and the life of smart well, reduce substantially the degree of difficulty of site operation simultaneously, save the site operation cycle, improve work efficiency.

In the description of the present invention, it should be noted that the terms "center", "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "inner", "outer", "top", "bottom", "end", etc., indicate orientations or positional relationships based on those shown in the drawings, and are only for convenience of description and simplicity of description, but do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.

While one embodiment of the present invention has been described in detail, the description is only a preferred embodiment of the present invention and should not be taken as limiting the scope of the utility model. All equivalent changes and modifications made within the scope of the present invention shall fall within the scope of the present invention.

Claims

1. The utility model provides a there is cable intelligence layering water injection tubular column's connection structure of no cable joint which characterized in that: the water distribution device comprises an upper oil pipe, an upper cable, an upper sealing water distribution assembly, a connecting cable, an oil pipe, a lower sealing water distribution assembly, a tail pipe and a plug, wherein the upper oil pipe and the upper cable are all positioned at the upper part of the sealing water distribution assembly, the upper oil pipe and the upper cable are both connected with the upper sealing water distribution assembly, the upper sealing water distribution assembly comprises a short-circuit component, an encapsulation structure, a packer, an intelligent water distributor, a first electric wire, a second electric wire and a steel pipe cable, the short-circuit component is fixedly connected with the upper oil pipe, the encapsulation structure is positioned at the connecting position of the upper cable and the short-circuit component, the encapsulation structure comprises a cable sealing hole, a sealing joint, two sealing rings, two check rings and a filling layer, the cable sealing hole is positioned at the connecting position of the upper cable and the short-circuit component, the cable sealing hole is fixedly connected with the short-circuit component, and one end of the upper cable is inserted into the cable sealing hole, the sealing joint is positioned at the connecting position of the upper cable and the cable sealing hole, the sealing joint is positioned at the upper part of the cable sealing hole, one end of the sealing joint is fixedly connected with the upper cable, the other end of the sealing joint is detachably connected with the cable sealing hole, the two sealing rings and the two check rings are positioned at the connecting position of the upper cable and the cable sealing hole in a staggered and superposed structure, the sealing rings and the two check rings are all positioned at the inner sides of the cable sealing hole, the sealing rings and the two check rings are detachably connected with the cable sealing hole, the filling layer is positioned inside the cable sealing hole, the filling layer is connected with the cable sealing hole, the packer is positioned at the lower part of the short-circuit part, the packer is fixedly connected with the short-circuit part, the intelligent water distributor is positioned at the lower part of the packer, and the intelligent water distributor is fixedly connected with the packer, the first electric wire and the second electric wire are respectively positioned at the inner sides of the short-circuit component and the intelligent water distributor, the first electric wire is fixedly connected with the short-circuit component, the second electric wire is fixedly connected with the intelligent water distributor, the steel pipe cable is positioned at the inner side of the packer, the steel pipe cable is fixedly connected with the packer, one end of the first electric wire penetrates through the cable sealing hole and is connected with the upper cable, the other end of the first electric wire is connected with the steel pipe cable, one end of the second electric wire is connected with the steel pipe cable, the other end of the second electric wire is connected with the connecting cable, the connecting cable and the oil pipe are positioned at a position between the upper sealed water distribution assembly and the lower sealed water distribution assembly, one end of the connecting cable is connected with the upper sealed water distribution assembly, the other end of the connecting cable is connected with the lower sealed water distribution assembly, and one end of the oil pipe is connected with the upper sealed water distribution assembly, the other end of the oil pipe is connected with the lower sealed water distribution assembly, the tail pipe is positioned at the lower part of the lower sealed water distribution assembly and connected with the lower sealed water distribution assembly, the plug is positioned at the lower part of the tail pipe, and the plug is connected with the tail pipe.

2. The connection structure of the cableless intelligent layered water injection string according to claim 1, wherein: the cable sealing holes are all circular hole structures.

3. The connection structure of the cableless intelligent layered water injection string according to claim 1, wherein: and the sealing joints are all stainless steel sealing elements.

4. The connection structure of the cableless intelligent layered water injection string according to claim 1, wherein: the sealing rings are all rubber rings.

5. The connection structure of the cableless intelligent layered water injection string according to claim 1, wherein: the retainer ring is a stainless steel ring or a hard plastic ring.

6. The connection structure of the cableless intelligent layered water injection string according to claim 1, wherein: and the filling layer is sealant.

7. The connection structure of the cableless intelligent layered water injection string according to claim 1, wherein: the lower sealed water distribution assembly comprises a short-circuit component, an encapsulation structure, a packer, an intelligent water distributor, a third wire and a steel pipe cable, the encapsulation structure of the lower sealed water distribution assembly also comprises a cable sealing hole, a sealing joint, two sealing rings, two check rings and a filling layer, the other end of the connecting cable is inserted into the cable sealing hole in the short-circuit component of the lower sealed water distribution assembly, and the other end of the connecting cable is connected with the cable sealing hole in the short-circuit component of the lower sealed water distribution assembly by the encapsulation structure.