Combined metal soluble bridge plug

Abstract

The invention discloses a combined metal soluble bridge plug, and relates to the technical field of bridge plugs. Comprising a pull rod connector; a soluble connecting piece is mounted on the pull rod connecting piece, and a slip connecting piece is mounted on the soluble connecting piece; the slip connecting piece is used for detecting in-place expansion; the soluble connecting piece is used for reducing the temperature of the solution; the pull rod connecting piece is provided with a dissolution detection piece; the dissolving breakage detection piece is used for detecting the dissolving breakage of the tail end of the soluble connecting piece; the four adopted expansion clamping pieces can achieve graded isolation and graded dissolution and can be matched with the expansion extrusion piece, the expansion clamping pieces can be dissolved one by one in the actual dissolution process, the situation that a traditional soluble bridge plug is usually directly and comprehensively dissolved can be prevented, and the sealing failure speed is high; the problems that the dissolving speed of an existing soluble bridge plug is inconvenient to control, the influence of conditions such as temperature and pressure is large, a worker cannot control the construction period conveniently, and segmented controllable dissolving is inconvenient are solved.

Description

Technical Field

[0001] The invention relates to the technical field of bridge plugs, in particular to a combined metal soluble bridge plug. Background Art

[0002] Soluble bridge plug is a key tool used in oilfield development. It has the advantages of reliable anchoring and low cost. It can be dissolved with solution, avoiding the risks that may occur in traditional drilling bridge plug operations, such as stuck drill and difficulty in milling. Soluble bridge plug is mainly used for staged fracturing operations in oilfield development. By blocking specific sections in the wellbore, multi-cluster perforation and fracturing construction are realized, thereby increasing oil and gas production. After the actual soluble bridge plug construction, solution needs to be added to degrade the soluble bridge plug. The current dissolution rate of soluble bridge plug is not easy to control and is greatly affected by temperature, pressure and other conditions. It is not easy for staff to control the construction period, it is not easy to dissolve in sections, it is not easy to reduce the dissolution rate urgently, and the flexibility is not good. It is also not easy to understand the sealing status when installing the soluble bridge plug. Affected by the roundness of the well wall, the slip is prone to loose locking, causing safety hazards. At the same time, it is not easy for staff to detect the dissolution progress. It mainly relies on the judgment of the dissolution time, which is not accurate enough and affects the progress of the construction period.

[0003] To this end, we propose a combined metal soluble bridge plug. Summary of the invention

[0004] The purpose of the present invention is to provide a combined metal soluble bridge plug to solve the problems raised in the above background technology that the dissolution rate of the current soluble bridge plug is difficult to control, is greatly affected by conditions such as temperature and pressure, is not convenient for workers to control the construction period, and is not convenient for segmented controllable dissolution.

[0005] To achieve the above-mentioned objectives, the present invention provides the following technical solutions: a combined metal soluble bridge plug, comprising a tie rod connector; a soluble connector is installed on the tie rod connector, and a slip connector is installed on the soluble connector; the slip connector is used to detect expansion in place; the soluble connector is used to reduce the solution temperature; a dissolution detection component is installed on the tie rod connector; the dissolution detection component is used to detect the dissolution of the end of the soluble connector; three expansion extrusion components are installed on the slip connector; four expansion clamping components are installed on the slip connector; the three expansion extrusion components are located between the four expansion clamping components; the four expansion clamping components are used to detect the stability of the clamping position; three graded dissolution control components are installed on the tie rod connector, and the three graded dissolution control components are electrically connected to the soluble connector; the tie rod connector comprises: a core shaft and a front thread, and the front end of the core shaft is provided with a front thread; the core shaft is used to connect a sealing tool.

[0006] Preferably, the graded fuse control component includes: a fuse pressure column and a power-off switch, wherein three fuse pressure columns are provided, and the three fuse pressure columns are respectively slidably mounted on the core shaft; the top of the fuse pressure column is an arc structure; the bottom of the three fuse pressure columns are respectively fixedly mounted with a power-off switch; the end of the power-off switch is attached to the core shaft; the three power-off switches are respectively electrically connected to the lamp beads on the indicator light.

[0007] Preferably, the cava connecting piece includes: a cava connecting tube, a sealing limit ring and a power connection piece, the cava connecting tube is sleeved on a soluble connecting sleeve; a sealing limit ring is fixedly installed on the end of the cava connecting tube; a power connection piece is fixedly installed on the inner side of the sealing limit ring, and the power connection piece is used to elastically fit the power connection ring; an indicator light is connected in series between the power connection piece and the power connection ring; the sealing limit ring is used to abut against the sealing tool; the outer side of the cava connecting tube is a slope structure.

[0008] Preferably, the expansion extrusion part includes: an expansion fixing ring and a limit tension spring, wherein three expansion fixing rings are provided, and the three expansion fixing rings are respectively sleeved on the cava connecting tube; the three expansion fixing rings are respectively connected with limit tension springs; the two sides of the expansion fixing ring are inclined structures; the side surfaces of the expansion fixing rings on both sides are respectively connected between the entry head and the sealing limit ring through limit tension springs.

[0009] Preferably, the expansion positioning member includes: a rubber expansion ring, an expansion block, a slip block, an anti-accidental touch spring and a V-shaped piece for power connection, the rubber expansion ring is sleeved on the outside of the slip connection tube; the side of the rubber expansion ring is a sloped structure; the side of the rubber expansion ring is attached to the expansion fixing ring; a circle of expansion blocks is fixedly embedded on the rubber expansion ring; slip blocks are slidably inserted on a circle of expansion blocks; the slip blocks are used to expand and stick to the well wall; two anti-accidental touch springs are fixedly installed at the bottom of the slip block, and the ends of the two anti-accidental touch springs are respectively connected to the inner side of the expansion block; a V-shaped piece for power connection is fixedly installed at the bottom of the slip block, and the V-shaped piece for power connection is a "V"-shaped piece; the end of the V-shaped piece for power connection is used to fit the inner side of the expansion block; the V-shaped piece for power connection, the expansion block and the indicator light are connected in series with a power supply.

[0010] Preferably, the pull rod connector also includes: a traction rope and an indicator light, the traction rope is fixedly installed at the tail of the core shaft; the end of the traction rope is led out of the wellhead; the core shaft is insoluble; the end of the traction rope is fixedly installed with an indicator light; five lamp beads are arranged inside the indicator light.

[0011] Preferably, the graded fuse control component further includes: an upward push spring, a push spring is fixedly installed at the bottom of the fuse pressure column, and the end of the push spring is connected to the inner side of the core shaft; the power-off switch is aligned with the fuse groove.

[0012] Preferably, the soluble connecting piece includes: a soluble connecting sleeve, a dissolving groove, an electric connection ring, a semiconductor refrigeration ring and an entry head, the soluble connecting sleeve is threadedly connected to the front thread; three dissolving grooves are opened on the soluble connecting sleeve; a power connection ring is fixedly installed on the soluble connecting sleeve; three semiconductor refrigeration rings are fixedly connected to the soluble connecting sleeve; the front end of the soluble connecting sleeve is threadedly connected to the entry head, and the side surface of the entry head is a slope structure; the soluble connecting sleeve is sleeved on the outside of the core shaft; the semiconductor refrigeration ring is used to reduce the solution temperature; the three semiconductor refrigeration rings are externally connected to control switches.

[0013] Preferably, the blown fuse detection component also includes: a detection slide column, which is slidably inserted on the core shaft; the detection slide column is attached to the blown fuse micro switch; the end of the detection spring is connected to the core shaft, and the other end of the detection spring is fixedly mounted on the detection slide column; the end of the entry head is fitted to squeeze the detection slide column.

[0014] Preferably, the blown fuse detection component includes: a blown fuse microswitch and a detection spring, wherein the blown fuse microswitch is fixedly mounted on the inner side of the core shaft; a detection spring is sleeved on the end of the core shaft, and the detection spring is located on the outer side of the blown fuse microswitch; and the blown fuse microswitch is electrically connected to an indicator light.

[0015] Compared with the prior art, the present invention has the following beneficial effects:

[0016] The present invention adopts the slip connector to cooperate with the soluble connector to perform expansion drive in place detection work, which can improve the actual sealing quality of the structure, can avoid the problem of loose installation of the bridge plug caused by inadequate sealing, can intuitively prompt the staff, and use the semiconductor refrigeration ring to facilitate the staff to control the temperature after startup and slow down the dissolution rate. It can be better adjusted according to construction needs, and the structure is more reasonable.

[0017] The four expansion retaining members adopted can realize graded isolation and graded dissolution, and can cooperate with the expansion extrusion members. In the actual dissolution process, the expansion retaining members can be dissolved one by one, which can prevent the traditional soluble bridge plugs from being directly and completely dissolved and the sealing failure speed is fast. The dissolution of this structure is more reasonable, and can be used to detect the sealing performance of the four rubber expansion rings and the cava blocks of this structure to the well wall, which can improve the stability of the sealing and prevent loosening. It can reflect the roundness of the well wall and prevent the problem of loose sealing caused by local defects. It can be used to remind the staff to change the sealing position in time.

[0018] The use of dissolution detection parts can make it easier for workers to understand the dissolution status of the entry head at the end, and can prevent the problem of inaccurate judgment of the dissolution progress by relying solely on time due to changes in the dissolution rate. The dissolution time of the bridge plug will also be affected by factors such as temperature and pressure. This structure can make it easier for workers to understand the dissolution status and formulate subsequent construction projects. The detection method of this structure is intuitive.

[0019] The use of graded dissolving control components in conjunction with dissolving tanks makes it easy for workers to understand the dissolving progress during actual dissolving work. At the same time, three power-off switches can be used to further control the semiconductor refrigeration ring to release refrigeration, which can make it easier to achieve segmented dissolving and dissolving step by step to avoid the problem of sealing failure caused by overall dissolving. The independent temperature control method will not cause excessive dissolution even if the dissolving solution penetrates into the outside of the rubber expansion ring. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 It is a schematic diagram of the overall structure of a combined metal soluble bridge plug of the present invention;

[0021] Figure 2 It is a schematic diagram of the installation position of the expansion extrusion member of the present invention;

[0022] Figure 3 A cross-sectional view of the overall structure of a combined metal soluble bridge plug of the present invention;

[0023] Figure 4 It is a schematic diagram of the structure of the pull rod connecting piece of the present invention;

[0024] Figure 5 This is a schematic diagram of the structure of the soluble connector of the present invention;

[0025] Figure 6 This is a schematic diagram of the structure of the slip connector of the present invention;

[0026] Figure 7 For the present invention Figure 3 A magnified view of the structure of the middle B area;

[0027] Figure 8 For the present invention Figure 3 A magnified view of the structure of the middle C region;

[0028] Fig. 9 For the present invention Figure 2 A magnified view of the structure of the middle D region;

[0029] Fig.10 For the present invention Figure 3 A magnified view of the structure of the middle E region;

[0030] Fig.11 For the present invention Figure 1 A magnified view of the structure of the middle F region.

[0031] In the figure: 1. pull rod connector; 101. mandrel; 1011. front thread; 102. traction rope; 103. indicator light; 2. soluble connector; 201. soluble connector sleeve; 2011. melt-break groove; 2012. connection coil; 202. semiconductor refrigeration coil; 203. entry head; 3. slip connector; 301. slip connection tube; 302. setting limit ring; 303. connection sheet; 4. melt-break detection piece; 40 1. Melt-open micro switch; 402. Detection spring; 403. Detection slide column; 5. Expansion extrusion piece; 501. Expansion fixing ring; 502. Limit tension spring; 6. Expansion positioning piece; 601. Rubber expansion ring; 602. Expansion block; 603. Slip block; 604. Anti-accidental touch spring; 605. Power connection V-shaped piece; 7. Gradual melt-open control piece; 701. Melt-open pressure column; 702. Power-off switch; 703. Push-up spring. DETAILED DESCRIPTION

[0032] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0033] Example 1: Please refer to Figure 1-Figure 11 As shown:

[0034] The present invention provides a technical solution: a combined metal soluble bridge plug, comprising a rod connector 1; a soluble connector 2 is installed on the rod connector 1, and a slip connector 3 is installed on the soluble connector 2; the slip connector 3 is used to detect expansion in place; the soluble connector 2 is used to reduce the solution temperature; a dissolution detection component 4 is installed on the rod connector 1; the dissolution detection component 4 is used to detect the dissolution of the end of the soluble connector 2; three expansion extrusion components 5 are installed on the slip connector 3; four expansion clamping components 6 are installed on the slip connector 3; the three expansion extrusion components 5 are located between the four expansion clamping components 6; the four expansion clamping components 6 are used to detect the stability of the clamping position; three graded dissolution control components 7 are installed on the rod connector 1, and the three graded dissolution control components 7 are electrically connected to the soluble connector 2; the rod connector 1 comprises: a core shaft 101 and a front thread 1011, and the front end of the core shaft 101 is provided with a front thread 1011; the core shaft 101 is used to connect a sealing tool.

[0035] Among them, the pull rod connector 1 also includes: a traction rope 102 and an indicator light 103, the traction rope 102 is fixedly installed at the tail of the core shaft 101; the end of the traction rope 102 is led out of the wellhead; the core shaft 101 is insoluble; the indicator light 103 is fixedly installed at the end of the traction rope 102; five lamp beads are arranged inside the indicator light 103; the pull rod connector 1 can be insoluble and can be easily reused; the soluble connector 2 includes: a soluble connection sleeve 201, a dissolving groove 2011, an electric connection ring 2012, a semiconductor refrigeration ring 202 and an entry head 203, the soluble connection sleeve 201 is threadedly connected to the front thread 1011; three dissolving grooves 2011 are opened on the soluble connection sleeve 201; the electric connection ring 201 is fixedly installed on the soluble connection sleeve 201 012; three semiconductor refrigeration coils 202 are fixedly sleeved on the soluble connection sleeve 201; the front end of the soluble connection sleeve 201 is threadedly connected with an entry head 203, and the side of the entry head 203 is a bevel structure; the soluble connection sleeve 201 is sleeved on the outside of the core shaft 101; the semiconductor refrigeration coil 202 is used to reduce the solution temperature; the three semiconductor refrigeration coils 202 are externally connected to a control switch; the slip connection part 3 includes: a slip connection tube 301, a sealing limit ring 302 and an electric connection sheet 303, and the slip connection tube 301 is sleeved on the soluble connection sleeve 201; a sealing limit ring 302 is fixedly installed at the end of the slip connection tube 301; an electric connection sheet 303 is fixedly installed on the inner side of the sealing limit ring 302, and the electric connection sheet 303 is used for elastic bonding The electric ring 2012 is connected; the electric plate 303 and the electric ring 2012 are connected in series with the indicator light 103; the sealing limit ring 302 is used to abut the sealing tool; the outer side of the slip connection tube 301 is a slope structure, and the slip connection piece 3 can cooperate with the soluble connection piece 2 to perform expansion drive in place detection work, which can improve the actual sealing quality of the structure, avoid the problem of loose installation of the bridge plug caused by inadequate sealing, and can intuitively prompt the staff. The use of the semiconductor refrigeration ring 202 can facilitate the staff to control the temperature after startup and slow down the dissolution rate. It can be better adjusted according to construction needs, and the structure is more reasonable. The core shaft 101 is pulled by the sealing tool. At this time, the cylinder wall of the sealing tool abuts against the slip connection tube 301, At this time, the entry head 203 can be moved back to perform the sealing and extrusion work. During the process, the power supply sheet 303 is close to the power supply circle 2012 and fits it. At this time, the indicator light 103 lights up to prompt. After the sealing is completed, the sealing tool is recovered. At this time, the dissolving solution can be put into the wellbore for dissolving work. The solution concentration can be adjusted to a higher concentration. If the dissolution rate is too fast, it may cause the bridge plug to fail prematurely and fail to complete the expected sealing task; if the dissolution rate is too slow, it may extend the operation cycle and increase the operation cost. The staff can make adjustments according to needs. After the switch connected to the semiconductor refrigeration coil 202 is turned on, the dissolution rate of the solution in this structure after cooling by the semiconductor refrigeration coil 202 is greatly reduced, which can be adjusted according to needs.

[0036] Among them, the expansion extrusion component 5 includes: an expansion fixing ring 501 and a limiting tension spring 502. There are three expansion fixing rings 501, and the three expansion fixing rings 501 are respectively sleeved on the slip connection tube 301; the limiting tension springs 502 are respectively connected between the three expansion fixing rings 501; the two sides of the expansion fixing ring 501 are inclined structures; the sides of the expansion fixing rings 501 on both sides are respectively connected between the entry head 203 and the setting limit ring 302 through limiting tension springs 502; the limiting tension spring 502 is used to elastically pull the expansion fixing ring 501 to better fit the side of the rubber expansion ring 601 for limiting; the expansion clamping component 6 includes: a rubber expansion ring 601, an expansion block 602, a slip block 603, an anti-mistouch spring 604 and an electrical V-shaped piece 605, a rubber expansion ring 601 is sleeved on the outside of the cava connecting tube 301; the side of the rubber expansion ring 601 is a slope structure; the side of the rubber expansion ring 601 is attached to the expansion fixing ring 501; a circle of expansion blocks 602 are fixedly embedded on the rubber expansion ring 601; a circle of expansion blocks 602 are respectively slidably plugged with cava blocks 603; the cava blocks 603 are used for expansion and sticking to the well wall; two anti-accidental touch springs 604 are fixedly installed at the bottom of the cava block 603, and the ends of the two anti-accidental touch springs 604 are respectively connected to the inner side of the expansion block 602; an electrical connection V-shaped piece 605 is fixedly installed at the bottom of the cava block 603, and the electrical connection V-shaped piece 605 is a "V"-shaped piece; the end of the electrical connection V-shaped piece 605 is used to fit the inner side of the expansion block 602; the electrical connection V-shaped piece 605, the expansion block 602 and the indicator light 103 are connected in series The four expansion retaining members 6 used in the connected power source can achieve graded isolation and graded dissolution, and can cooperate with the expansion extrusion member 5. In the actual dissolution process, the expansion retaining members 6 can be dissolved one by one, which can prevent the traditional soluble bridge plug from being directly and completely dissolved and the sealing failure speed is fast. The dissolution of this structure is more reasonable, and the power-connected V-shaped piece 605 is used in conjunction with the cava block 603, which can be used to detect the fit of the four rubber expansion rings 601 to the well wall, and can be used to detect the sealing of the four rubber expansion rings 601 and the cava block 603 of this structure to the well wall, which can improve the stability of the sealing and prevent loosening, can reflect the roundness of the well wall, and prevent the problem of loose sealing caused by local defects, and can be used to remind the staff to change the sealing position in time. , the structure is more reasonable, which can improve the installation stability of the structure and realize graded dissolution. When the entry head 203 moves, the expansion fixing ring 501 and the rubber expansion ring 601 will be squeezed. Because the inner diameter of the well wall is limited, the expansion fixing ring 501 will squeeze the rubber expansion ring 601 at an inclined surface, and control the four rubber expansion rings 601 to expand separately and fit to the well wall. At this time, the slip block 603 and the rubber expansion ring 601 can be squeezed and fit to the well wall, and the anti-mistouch spring 604 is compressed. The slip block 603 slides on the expansion block 602, driving the power-connected V-shaped piece 605 to fit the inner side of the expansion block 602. At this time, the indicator light 103 can light up to prompt. On the contrary, when the local power-connected V-shaped piece 605 cannot fit the inner side of the expansion block 602, it indicates that there is a depression here.

[0037] Among them, the fuse detection component 4 includes: a fuse micro switch 401 and a detection spring 402, the fuse micro switch 401 is fixedly installed on the inner side of the core shaft 101; the detection spring 402 is sleeved on the end of the core shaft 101, and the detection spring 402 is located on the outer side of the fuse micro switch 401; the fuse micro switch 401 is electrically connected to the indicator light 103; the fuse detection component 4 also includes: a detection slide post 403, a detection slide post 403 is slidably inserted on the core shaft 101; the detection slide post 403 is attached to the fuse micro switch 401; the end of the detection spring 402 is connected to the core shaft 101, and the other end of the detection spring 402 is fixedly installed on the detection slide post 403; the end of the entry head 203 is pressed against the detection slide post 403; the use of the fuse detection component 4 can facilitate the work The workers understand the dissolution status of the entry head 203 at the end, which can prevent the problem that the method of judging the dissolution progress by relying solely on time is not accurate enough due to changes in the dissolution rate. The dissolution time of the bridge plug will also be affected by factors such as temperature and pressure. This structure can make it easier for the workers to understand the dissolution status and formulate subsequent construction projects. The detection method of this structure is intuitive, which improves the accuracy of grasping the dissolution time of the bridge plug. After the dissolution solution is added to the wellbore, as the solution completely dissolves the rubber expansion ring 601, as the connection between the soluble connecting sleeve 201 and the entry head 203 dissolves, the entry head 203 no longer squeezes the detection sliding column 403. After the dissolution microswitch 401 is no longer squeezed, the corresponding lamp bead on the indicator light 103 can be controlled to turn off.

[0038] Embodiment 2, on the basis of embodiment 1, the graded fusing control part 7 comprises: a fusing pressure column 701 and a power-off switch 702, three fusing pressure columns 701 are provided, and the three fusing pressure columns 701 are respectively slidably mounted on the core shaft 101; the top of the fusing pressure column 701 is an arc structure; the bottom of the three fusing pressure columns 701 are respectively fixedly mounted with power-off switches 702; the ends of the power-off switches 702 are attached to the core shaft 101; the three power-off switches 702 are respectively electrically connected to the lamp beads on the indicator light 103; the graded fusing control part 7 also comprises: an upward push spring 703, the bottom of the fusing pressure column 701 is fixedly mounted with an upward push spring 703, and the end of the upward push spring 703 is connected to the inner side of the core shaft 101; the power-off switch 702 is aligned with the fusing groove 2011, and the graded fusing control part 7 is used in conjunction with the fusing groove 2011, so that in the actual fusing work, it is convenient for the staff to understand the fusing progress, and at the same time, the three power-off switches 702 can be used for further Step-by-step control of the semiconductor refrigeration coil 202 to release refrigeration can make it easier to achieve segmented melting and gradually carry out melting to avoid the problem of sealing failure caused by overall melting. The structure can gradually control the cooling of the semiconductor refrigeration coil 202 as the melting is carried out, that is, after the rubber expansion ring 601 on the front side is melted, the rubber expansion ring 601 on the rear side is in a cooling state, and even if the dissolving solution penetrates into the outside of the rubber expansion ring 601, it will not cause excessive dissolution. The structure is more reasonable, and the three semiconductor refrigeration coils 202 are independently controlled, and the graded melting control component 7 is used to provide prompts in time. In the actual melting work, as the melting is carried out, when the melting groove 2011 is melted and degraded, the power-off switch 702 is no longer under pressure to control the lamp bead on the indicator light 103 to light up. The three power-off switches 702 are used to prompt the melting progress in this way. During the process, the staff can control the cooling of the semiconductor refrigeration coil 202 in real time.

[0039] The working principle of this embodiment is as follows: first, the existing sealing tool is used, and after the core shaft 101 is connected, the structure is lowered to the well wall sealing position, and the core shaft 101 is pulled by the sealing tool. At this time, the barrel wall of the sealing tool is against the slip connection barrel 301, and the entry head 203 can be moved back to perform the sealing extrusion work. During the process, the power-on sheet 303 is close to the power-on ring 2012 and fits. At this time, the indicator light 103 lights up to prompt. After the sealing is completed, the sealing tool is recovered. At this time, the dissolving solution can be put into the wellbore for dissolving work. When the entry head 203 moves, it will cause the expansion fixing ring 501 and the rubber expansion ring 601 to be squeezed. Because the inner diameter of the well wall is limited, the expansion fixing ring 501 will perform inclined extrusion on the rubber expansion ring 601, control the four rubber expansion rings 601 to expand separately and fit against the well wall, which ensures that after the four rubber expansion rings 601 expand, the rubber expansion ring 601 will also drive the slip block 603 to fit and extrude the well wall for positioning. When the expansion fixing ring 501 is squeezed, it moves to the side of the setting limit ring 302. At this time, the slip block 603 and the rubber expansion ring 601 can be squeezed and fit against the well wall, the anti-mistouch spring 604 is compressed, and the slip block 603 slides on the expansion block 602 to drive the V-shaped piece connected to the power supply 605 fits the inside of the expansion block 602, and the indicator light 103 can light up to prompt. On the contrary, when the local power-on V-shaped piece 605 cannot fit the inside of the expansion block 602, it means that there is a depression here, and the indicator light 103 will not light up to prompt, ensuring the sealing of the bridge plug. As the fusing progresses, when the fusing groove 2011 is fusing and degraded, the fusing pressure column 701 is no longer squeezed. Under the squeezing of the push-up spring 703, the fusing pressure column 701 moves up, and the power-off switch 702 is no longer under pressure to control the lamp bead on the indicator light 103 to light up. In this way, the three power-off switches 702 are used to indicate the fusing progress, and the process The staff can control the semiconductor refrigeration coil 202 to cool down in real time; as the solution dissolves the rubber expansion ring 601 completely, the connection between the soluble connecting sleeve 201 and the entry head 203 will also be dissolved. As the connection between the soluble connecting sleeve 201 and the entry head 203 dissolves, the entry head 203 no longer squeezes the detection slide column 403. Under the squeezing of the detection spring 402, the detection slide column 403 moves outward. After the melted microswitch 401 is no longer squeezed, the corresponding lamp bead on the indicator light 103 can be controlled to turn off. After all the dissolution is completed, the core shaft 101 can be pulled out by the traction rope 102.

[0040] It should be noted that, in this article, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device.

[0041] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A combined metal soluble bridge plug, comprising a tie rod connector (1); a soluble connector (2) is mounted on the tie rod connector (1), characterized in that: A slip connector (3) is installed on the soluble connector (2); the slip connector (3) is used to detect whether the expansion is in place; the soluble connector (2) is used to reduce the temperature of the solution; The pull rod connector (1) is provided with a fusing detection component (4); the fusing detection component (4) is used to detect the fusing of the end of the soluble connector (2); Three expansion extrusion members (5) are installed on the slip connection member (3); four expansion clamping members (6) are installed on the slip connection member (3); the three expansion extrusion members (5) are located between the four expansion clamping members (6); the four expansion clamping members (6) are used to detect the stability of the clamping position; Three graded fuse control components (7) are installed on the pull rod connector (1), and the three graded fuse control components (7) are electrically connected to the fusible connector (2); The pull rod connector (1) comprises: a core shaft (101) and a front thread (1011); the front end of the core shaft (101) is provided with a front thread (1011); the core shaft (101) is used to connect a setting tool.

2. A combined metal soluble bridge plug according to claim 1, characterized in that: The pull rod connector (1) further comprises: a traction rope (102) and an indicator light (103); the traction rope (102) is fixedly mounted on the tail of the core shaft (101); the end of the traction rope (102) is led out of the wellhead; the core shaft (101) is insoluble; the end of the traction rope (102) is fixedly mounted on the end of the traction rope (102); and five lamp beads are arranged inside the indicator light (103).

3. A combined metal soluble bridge plug according to claim 2, characterized in that: The soluble connecting piece (2) comprises: a soluble connecting sleeve (201), a dissolving groove (2011), an electric connection ring (2012), a semiconductor refrigeration ring (202) and an entry head (203); the soluble connecting sleeve (201) is threadedly connected to the front thread (1011); three dissolving grooves (2011) are provided on the soluble connecting sleeve (201); an electric connection ring (2012) is fixedly installed on the soluble connecting sleeve (201); three semiconductor refrigeration rings (202) are fixedly sleeved on the soluble connecting sleeve (201); the front end of the soluble connecting sleeve (201) is threadedly connected to the entry head (203), and the side surface of the entry head (203) is an inclined surface structure; the soluble connecting sleeve (201) is sleeved on the outside of the core shaft (101); the semiconductor refrigeration ring (202) is used to reduce the temperature of the solution; and the three semiconductor refrigeration rings (202) are externally connected to a control switch.

4. A combined metal soluble bridge plug according to claim 3, characterized in that: The slip connection piece (3) comprises: a slip connection tube (301), a setting limit ring (302) and a power connection piece (303); the slip connection tube (301) is sleeved on the soluble connection sleeve (201); a setting limit ring (302) is fixedly mounted on the end of the slip connection tube (301); a power connection piece (303) is fixedly mounted on the inner side of the setting limit ring (302), and the power connection piece (303) is used to elastically fit the power connection ring (2012); the power connection piece (303) and the power connection ring (2012) are connected in series with an indicator light (103); the setting limit ring (302) is used to abut against a setting tool; and the outer side of the slip connection tube (301) is a slope structure.

5. The combined metal soluble bridge plug according to claim 3, characterized in that: The fusible detection component (4) comprises: a fusible micro switch (401) and a detection spring (402); the fusible micro switch (401) is fixedly mounted on the inner side of the core shaft (101); the detection spring (402) is sleeved on the end of the core shaft (101), and the detection spring (402) is located on the outer side of the fusible micro switch (401); the fusible micro switch (401) is electrically connected to the indicator light (103).

6. The combined metal soluble bridge plug according to claim 5, characterized in that: The fuse detection component (4) further comprises: a detection slide post (403), the detection slide post (403) being slidably inserted on the core shaft (101); the detection slide post (403) being attached to the fuse micro switch (401); the end of the detection spring (402) being connected to the core shaft (101), and the other end of the detection spring (402) being fixedly mounted on the detection slide post (403); and the end of the entry head (203) being attached to and extruding the detection slide post (403).

7. The combined metal soluble bridge plug according to claim 4, characterized in that: The expansion extrusion member (5) comprises: an expansion fixing ring (501) and a limit tension spring (502); three expansion fixing rings (501) are provided, and the three expansion fixing rings (501) are respectively sleeved on the slip connection tube (301); the limit tension springs (502) are respectively connected between the three expansion fixing rings (501); both sides of the expansion fixing ring (501) are inclined structures; the side surfaces of the expansion fixing rings (501) on both sides are respectively connected between the entry head (203) and the setting limit ring (302) through the limit tension springs (502).

8. The combined metal soluble bridge plug according to claim 7, characterized in that: The expansion blocking member (6) comprises: a rubber expansion ring (601), an expansion block (602), a slip block (603), an anti-mistaken touch spring (604) and a V-shaped sheet (605) for connecting electricity; the rubber expansion ring (601) is sleeved on the outside of the slip connection tube (301); the side surface of the rubber expansion ring (601) is an inclined surface structure; the side surface of the rubber expansion ring (601) is attached to the expansion fixing ring (501); a circle of expansion blocks (602) is fixedly embedded on the rubber expansion ring (601); the circle of expansion blocks (602) are respectively slidably plugged with slip blocks (603); 3); the slip block (603) is used to expand and stick to the well wall; two anti-accidental touch springs (604) are fixedly installed at the bottom of the slip block (603), and the ends of the two anti-accidental touch springs (604) are respectively connected to the inner side of the expansion block (602); a power connection V-shaped piece (605) is fixedly installed at the bottom of the slip block (603), and the power connection V-shaped piece (605) is a "V"-shaped piece; the end of the power connection V-shaped piece (605) is used to stick to the inner side of the expansion block (602); the power connection V-shaped piece (605), the expansion block (602) and the indicator light (103) are connected in series with a power supply.

9. The combined metal soluble bridge plug according to claim 3, characterized in that: The graded fuse control component (7) comprises: a fuse pressure column (701) and a power-off switch (702); three fuse pressure columns (701) are provided, and the three fuse pressure columns (701) are respectively slidably mounted on the core shaft (101); the top of the fuse pressure column (701) is an arc structure; the bottom of the three fuse pressure columns (701) is respectively fixedly mounted with a power-off switch (702); the end of the power-off switch (702) is attached to the core shaft (101); and the three power-off switches (702) are respectively electrically connected to the lamp beads on the indicator light (103).

10. A combined metal soluble bridge plug according to claim 9, characterized in that: The graded fuse control component (7) further comprises: an upward push spring (703), the upward push spring (703) being fixedly mounted on the bottom of the fuse pressure column (701), and the end of the upward push spring (703) being connected to the inner side of the core shaft (101); the power-off switch (702) is aligned with the fuse groove (2011).

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