Coiled tubing jet bridge plug combined tool

Abstract

The utility model provides a continuous oil pipe injection bridge plug combined tool, and relates to the technical field of oil exploitation equipment. The continuous oil pipe injection bridge plug combined tool comprises an oil pipe connector, a hydraulic release, a centralizer, a positioner, a spray gun, a feeding and sealing tool and a bridge plug which are sequentially arranged. The positioner comprises a main body and a plurality of positioning parts, the multiple positioning parts are arranged on the circumferential side of the main body in a circumferential array mode along the axis of the main body, and the positioning parts are elastically connected with the main body; the positioning part comprises a first protrusion and a second protrusion which protrude in the direction opposite to the axis of the body, the first protrusion is close to the centralizer, the second protrusion is close to the spray gun, and the vertical distance from the end of the first protrusion to the axis is not larger than the vertical distance from the end of the second protrusion to the axis. The range defined by the multiple first protrusions can be larger than the inner diameter size of the sleeve. According to the technical scheme, hanging load fluctuation can be more obvious, and therefore accurate positioning can be achieved in the air-tight seal casing pipe.

Description

Technical Field

[0001] This application relates to the field of oil extraction equipment technology, and in particular to a continuous tubing jet bridge plug coupling tool. Background Technology

[0002] Coiled tubing-bridged perforation is a mature staged fracturing technology. This technology utilizes coiled tubing to carry the injection tool and bridge plug setting tool. By dropping a ball, the bridge plug is set, and the sliding sleeve is opened, exposing the injection gun. After sandblasting and perforation, the coiled tubing is retrieved, and main fracturing is then carried out through the casing, thus achieving large-scale fracturing. Using manual bottom-hole positioning and coupling locators, the reservoir can be flexibly layered, achieving the goal of precise fracturing.

[0003] The positioning principle of the coupling locator is based on the surface weight fluctuations caused by the casing coupling to determine the depth. However, most current well completion methods use gas-tight casing completion, which does not have couplings. This makes it extremely difficult, or even impossible, to locate the gas-tight casing using conventional coupling locators. Utility Model Content

[0004] The purpose of this application is to provide a continuous tubing jet bridge plug coupling tool to solve the problem of inaccurate positioning of the gas-tight sleeve by existing coupling positioners.

[0005] To address the aforementioned technical problems, this application provides the following technical solutions:

[0006] This application provides a continuous tubing jet bridge plug coupling tool, comprising: a tubing connector, a hydraulic release mechanism, a centralizer, a positioner, a spray gun, a sealing tool, and a bridge plug arranged sequentially; the positioner includes a main body and multiple positioning parts, the multiple positioning parts being arranged in a circumferential array around the axis of the main body, and the positioning parts being elastically connected to the main body; each positioning part includes a protruding structure protruding in a direction opposite to the axis of the main body, the protruding structure including a first protrusion and a second protrusion, the first protrusion being disposed near the centralizer, the second protrusion being disposed near the spray gun, the vertical distance from the end of the first protrusion to the axis being no greater than the vertical distance from the end of the second protrusion to the axis; wherein, the area enclosed by the multiple first protrusions can be larger than the inner diameter of the tubing.

[0007] In some embodiments of this application, the positioner further includes a first elastic element disposed inside the main body; the positioning part is an integrated block structure, and the positioning part has a connecting surface on the side opposite to the protruding structure, the connecting surface being connected to the first elastic element, and the protruding structure being able to be displaced relative to the main body in a direction toward the axis by means of the first elastic element.

[0008] In some embodiments of this application, the first elastic element is an arc-shaped structure, wherein the side of the arc-shaped structure that protrudes outward from its center abuts against the connecting surface.

[0009] In some embodiments of this application, the end angles of the first protrusion and the second protrusion on the longitudinal section of the locator are both acute angles.

[0010] In some embodiments of this application, the second protrusion further includes an inclined surface, the inclined surface being disposed away from the first protrusion, and the inclined surface being disposed at an obtuse angle to the axis.

[0011] In some embodiments of this application, the spray gun includes a body, a sliding sleeve, and a nozzle. The body has a hollow structure for introducing fluid. The body is provided with a plurality of first through holes, each of which is used to connect to one of the nozzles. The sliding sleeve is disposed inside the body and is slidably connected to the body along the axial direction of the body. The sliding sleeve is used to control the number of nozzles communicating with the interior of the body.

[0012] In some embodiments of this application, the spray gun further includes a second elastic element disposed within the body near one end of the sealing tool, and the sliding sleeve is connected to the second elastic element; the sliding sleeve has a hollow structure for receiving the action ball, and the sliding sleeve can slide relative to the body and compress the second elastic element under the action of the action ball.

[0013] In some embodiments of this application, the circumferential surface of the sliding sleeve is a sealing surface, and through holes are respectively provided at both ends of the sliding sleeve in the axial direction. The diameter of the through hole near the second elastic element is smaller than the diameter of the actuating ball, and the diameter of the other through hole is larger than the diameter of the actuating ball. The sliding sleeve has a first state and a second state under the action of the actuating ball. In the first state, the sliding sleeve is fixedly connected to the body and can block all the nozzles. In the second state, the sliding sleeve is slidably connected to the body and the sliding sleeve can allow at least a portion of the nozzles to communicate with the interior of the body.

[0014] In some embodiments of this application, the spray gun further includes a shear pin, which, in the first state, connects the sliding sleeve and the body respectively, and is used to limit the displacement of the sliding sleeve relative to the body.

[0015] In some embodiments of this application, the spray gun further includes a protective sleeve, which is fitted onto the outer periphery of the body and detachably connected to the body; the protective sleeve is provided with a plurality of second through holes, which are correspondingly arranged with a plurality of first through holes, and the nozzle can pass through the second through holes and be detachably connected to the first through holes of the body.

[0016] Compared to existing technologies, the coiled tubing jet bridge plug coupling tool provided in this application uses a positioning part of the locator that is elastically connected to the main body. Under the action of elastic force, the positioning part can tightly fit the surface of the recessed area at the casing connection position. As the tool continues to rise, the first protrusion first contacts the casing connection. When the first protrusion leaves the recessed area, it is squeezed by the casing surface, causing the positioning part to tilt. Given the elastic connection characteristics between the positioning part and the main body, this tilting further increases the energy storage of the elastic force between the second protrusion and the main body. Since the height of the second protrusion is greater than that of the first protrusion, the second protrusion can stably scrape against the bottom edge of the casing after the positioning part tilts. Under the combined influence of the further energy storage of the elastic force between the second protrusion and the main body caused by the tilting, and the force generated by the scraping, the second protrusion will bounce when leaving the recessed area. This bouncing greatly enhances the vibration amplitude and displacement change of the tool, making the fluctuation of the suspended weight on the ground more significant. Therefore, whether in conventional casing wells or gas-tight casing wells, this locator significantly improves the accuracy and reliability of positioning. Attached Figure Description

[0017] The above and other objects, features, and advantages of exemplary embodiments of this application will become readily understood by reading the following detailed description with reference to the accompanying drawings. In the drawings, several embodiments of this application are illustrated by way of example and not limitation, with the same or corresponding reference numerals denoteing the same or corresponding parts, wherein:

[0018] Figure 1 A schematic diagram of the structure of the continuous tubing jet bridge plug coupling tool according to an embodiment of this application is shown.

[0019] Figure 2 A schematic diagram of the positioner in the continuous tubing jet bridge plug coupling tool according to an embodiment of this application is shown.

[0020] Figure 3 A schematic cross-sectional view of the positioner in the continuous tubing jet bridge plug coupling tool according to an embodiment of this application is shown.

[0021] Figure 4 This diagram schematically illustrates the positioning state of the gas-tight sleeve in the continuous tubing jet bridge plug coupling tool according to an embodiment of this application.

[0022] Figure 5This schematically illustrates another state of the positioner positioning the gas-tight sleeve in the continuous tubing jet bridge plug coupling tool according to an embodiment of this application.

[0023] Figure 6 A schematic diagram of the spray gun structure in the continuous tubing jet bridge plug coupling tool according to an embodiment of this application is shown.

[0024] Figure 7 A schematic cross-sectional view of the spray gun in the continuous tubing jet bridge plug coupling tool according to an embodiment of this application is shown.

[0025] Explanation of icon numbers:

[0026] 1. Oil pipe connector; 2. Hydraulic release handle; 3. Centralizer; 4. Positioner; 401. Main body; 402. Positioning part; 403. First protrusion; 404. Second protrusion; 405. First elastic element; 5. Spray gun; 501. Body; 502. Sliding sleeve; 503. Nozzle; 504. Second elastic element; 505. Shear pin; 506. Protective sleeve; 6. Sealing tool; 7. Bridge plug; 8. Actuating ball; 9. Gas-tight sleeve. Detailed Implementation

[0027] Exemplary embodiments of the present disclosure will now be described in more detail with reference to the accompanying drawings. While exemplary embodiments of the present disclosure are shown in the drawings, it should be understood that the present disclosure may be implemented in various forms and should not be limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the disclosure to those skilled in the art.

[0028] It should be noted that, unless otherwise stated, the technical or scientific terms used in this application shall have the ordinary meaning as understood by one of ordinary skill in the art to which this application pertains. Example 1

[0029] This application provides a continuous tubing jet bridge plug coupling tool, such as... Figures 1 to 5As shown, the device includes, in sequence, an oil pipe connector 1, a hydraulic release mechanism 2, a centralizer 3, a positioner 4, a spray gun 5, a sealing tool 6, and a bridge plug 7. The positioner 4 includes a main body 401 and multiple positioning parts 402. The multiple positioning parts 402 are arranged in a circumferential array around the axis of the main body 401 and are elastically connected to the main body 401. The positioning parts 402 include a protruding structure protruding in the direction opposite to the axis of the main body 401. The protruding structure includes a first protrusion 403 and a second protrusion 404. The first protrusion 403 is located near the centralizer 3, and the second protrusion 404 is located near the spray gun 5. The vertical distance from the end of the first protrusion 403 to the axis is not greater than the vertical distance from the end of the second protrusion 404 to the axis. The area enclosed by the multiple first protrusions 403 can be larger than the inner diameter of the casing.

[0030] Before operation, securely connect the tubing connector 1 to the continuous tubing to provide power transmission and connection for the subsequent tool lowering and operation. Then, install the hydraulic release handle 2, centralizer 3, positioner 4, spray gun 5, sealing tool 6, and bridge plug 7 in sequence, ensuring that each component is assembled correctly in order.

[0031] The tubing connector 1 serves as the interface between the entire unit and the coiled tubing, ensuring a secure connection between the tool and the tubing. The hydraulic release mechanism 2 allows for the hydraulic separation of a portion of the tool when needed, typically used for equipment retrieval after the mission is complete. The centralizer 3 keeps the tool centered within the wellbore, reducing friction and damage to the wellbore. The positioner 4 is used for downhole positioning. The spray gun 5 is used to perform high-pressure fluid injection operations, such as for formation fracturing. The sealing tool 6 is responsible for accurately placing the bridge plug 7 in place, which is used to isolate different oil-bearing sections.

[0032] The positioner 4 has multiple positioning parts 402 arranged in a circumferential array, surrounding the axis of the main body 401 and positioned around its periphery. Each positioning part 402 is elastically connected to the main body 401. When the continuous tubing jet bridge plug coupling tool moves downwards along the casing, the positioning parts 402, due to their elastic properties, will contract towards the axis of the main body 401 when pressed against the inner wall of the casing. Each positioning part 402 has two protrusions arranged along the length of the main body 401: a first protrusion 403 and a second protrusion 404. The first protrusion 403 is located near the centralizer 3, and the second protrusion 404 is located near the spray gun 5. The vertical distance from the first protrusion 403 to the axis of the main body 401 is less than or equal to the vertical distance from the second protrusion 404 to the axis of the main body 401.

[0033] The working principle of the positioner 4 for positioning the casing coupling is as follows: there is a recessed area at the casing coupling. After the tool is lowered to the predetermined depth, the positioner 4 is lifted. When the positioning part 402 passes the casing coupling, the protruding structure will disengage from the recessed area and scrape against the bottom edge of the casing. This process causes the tool to vibrate and shift. These changes are transmitted to the ground equipment through the coiled tubing, ultimately manifesting as fluctuations in the ground suspension weight. The operator can accurately calculate the depth of the tool based on these fluctuations, thus achieving precise positioning.

[0034] Because the positioning part 402 is elastically connected to the main body 401, it can tightly conform to the surface of the recessed area under the action of elastic force. As the tool continues to rise, the first protrusion 403 first contacts the sleeve connection part. When the first protrusion 403 leaves the recessed area, it will be squeezed by the sleeve surface, which will cause the positioning part 402 to tilt. Given the elastic connection characteristics between the positioning part 402 and the main body 401, this tilt will further increase the energy storage of the elastic force between the second protrusion 404 and the main body 401. Since the height of the second protrusion 404 is greater than that of the first protrusion 403, the second protrusion 404 can stably scrape against the bottom edge of the sleeve after the positioning part 402 tilts. Under the combined influence of the tilt causing the elastic force between the second protrusion 404 and the main body 401 to further store energy, and the force generated by scraping, the second protrusion 404 will bounce when leaving the recessed area. This bounce greatly enhances the vibration amplitude and displacement change of the tool, making the fluctuation of the ground suspension more significant.

[0035] For the gas-tight casing 9, although it lacks a traditional coupling, a slight concave area still exists at the connection point of the two casings. The locator 4 provided in this embodiment, through the aforementioned mechanism, makes the weight fluctuations more pronounced, thereby achieving precise positioning even within the gas-tight casing 9. Whether in conventional casing wells or gas-tight casing 9 wells, this locator 4 significantly improves the accuracy and reliability of positioning, laying a solid foundation for subsequent precise operations using the coiled tubing jet bridge plug coupling tool.

[0036] In some embodiments, such as Figure 3 As shown, the positioner 4 also includes a first elastic element 405, which is disposed inside the main body 401; the positioning part 402 is an integrated block structure, and the side of the positioning part 402 facing away from the protruding structure is provided with a connecting surface, which is connected to the first elastic element 405. The protruding structure can be displaced relative to the main body 401 in the direction toward the axis through the first elastic element 405.

[0037] Multiple groove structures are provided around the periphery of the main body 401, with the depth direction of the groove structures perpendicular to the axis of the main body 401. Each groove structure contains a first elastic element 405, such as a spring or a spring washer. The positioning part 402, as an integrated block structure, can be embedded into the groove structure, and its connecting surface is connected to the first elastic element 405 located within the groove of the main body 401. When the positioning part 402 is subjected to external force, it can reciprocate along the depth direction of the groove via the first elastic element 405. The area enclosed by the protrusions of the multiple positioning parts 402 is larger than the inner diameter of the sleeve.

[0038] When the coiled tubing jet bridge plug coupling tool is lowered into the well, the inner wall of the casing compresses the positioning part 402 of the positioner 4, causing the first elastic element 405 to be in a compressed state. When the positioner 4 is pulled up, the positioning part 402 passes the casing connection position. At this time, under the action of elastic restoring force, the first elastic element 405 causes the positioning part 402 to fluctuate at this position. This fluctuation is transmitted to the surface through the coiled tubing, thereby achieving positioning.

[0039] In some embodiments, the positioner 4 is a solid structure with high strength, capable of withstanding pressure up to 70 MPa, and is suitable for continuous hydraulic jet bridge plug 7 operation process.

[0040] In some embodiments, such as Figure 4 and Figure 5 As shown, the first elastic element 405 has an arc-shaped structure, and the side of the arc-shaped structure that protrudes outward from its center abuts against the connecting surface.

[0041] Within the recessed structure of the main body 401 of the locator 4, arc-shaped first elastic elements 405 are installed. These arc-shaped first elastic elements 405 resemble miniature arched bridges, with their outward-protruding side facing away from the center abutting against the connecting surface of the locating part 402. When the coiled tubing jet bridge plug coupling tool is lowered into the well, the inner wall of the casing applies pressure to the locating part 402, and the arc-shaped first elastic elements 405 begin to function. Due to their special shape, under pressure, the entire arc-shaped structure deforms uniformly, dispersing the pressure and effectively storing elastic potential energy.

[0042] When the lifting positioner 4 passes the sleeve connection position, the first protrusion 403 first contacts the sleeve connection part. When the first protrusion 403 leaves the recessed area, it will be squeezed by the sleeve surface, which will cause the positioning part 402 to tilt, thereby squeezing the arc-shaped first elastic element 405, causing the first elastic element 405 to tilt towards the second protrusion 404. This tilting will further increase the energy storage of the elastic force between the second protrusion 404 and the main body 401, so that the second protrusion 404 will bounce when leaving the recessed area. This bounce greatly enhances the vibration amplitude and displacement change of the tool, making the fluctuation of the ground suspension weight more significant.

[0043] In some embodiments, the end angles of the first protrusion 403 and the second protrusion 404 on the longitudinal section of the locator 4 are both acute angles.

[0044] The first protrusion 403 and the second protrusion 404, due to their different heights, form a step-like structure. The ends of the first protrusion 403 and the second protrusion 404 on the longitudinal section of the locator 4 are acute-angled. When the tool descends to the vicinity of the casing coupling, the locating part 402 contacts the inner wall of the casing under elastic action. Because the ends of the first protrusion 403 and the second protrusion 404 are acute-angled, when the locating part 402 passes through the recessed area at the casing coupling, the acute-angled ends can more sensitively sense the edge of the recessed area. Due to the sharper ends, the force change on the tool caused by this scraping is more significant, and then transmitted to the ground through the continuous tubing, making the ground weight fluctuation more obvious, ultimately achieving more accurate positioning.

[0045] In some embodiments, the second protrusion 404 further includes an inclined surface, which is disposed away from the first protrusion 403 and is disposed at an obtuse angle to the axis.

[0046] The inclined surface of the second protrusion 404 is set away from the first protrusion 403 and forms an obtuse angle with the axis of the main body 401. Since the second protrusion 404 is higher than the first protrusion 403 and is set close to the spray gun 5, the second protrusion 404 is in a relatively forward position during the entire tool lowering process, and is the first to come into contact with various conditions in the well.

[0047] When the tool begins to descend into the well, the complex and variable well environment presents numerous uncertainties, such as irregularities on the casing wall, minor obstacles, and fluid resistance. In this situation, the inclined surface of the second protrusion 404 first interacts with the well environment. Because it forms an obtuse angle with the axis of the main body 401, the inclined surface acts as a guide during descent. This helps the tool slide more smoothly along the casing wall, reducing the likelihood of jamming or deviation from the intended trajectory due to local obstacles. Example 2

[0048] The continuous tubing jet bridge plug operation tool provided in Embodiment 2 of this application differs from that in Embodiment 1 in that the structure of the spray gun 5 is different.

[0049] In some embodiments, such as Figure 6 and Figure 7 As shown, the spray gun 5 includes a body 501, a sliding sleeve 502, and a nozzle 503. The body 501 has a hollow structure for introducing fluid. Multiple first through holes are provided on the body 501, and each first through hole is used to connect a nozzle 503. The sliding sleeve 502 is disposed inside the body 501 and is slidably connected to the body 501 along the axial direction of the body 501. The sliding sleeve 502 is used to control the number of nozzles 503 communicating with the interior of the body 501.

[0050] The body 501 can be a tubular structure with multiple first through holes arrayed along its length, for example, two holes in one ring, arranged in three rings. Each nozzle 503 is connected to its corresponding first through hole on the body 501, using methods such as sealed welding or detachable connections with sealing gaskets to ensure a tight connection and prevent leakage when high-pressure fluid is introduced. The sliding sleeve 502 is placed inside the body 501 and can slide flexibly in the axial direction of the body 501 via a slide rail or similar structure without jamming or wobbling.

[0051] When the coiled tubing jetting bridge plug coupling tool is lowered to the predetermined downhole position, the bridge plug 7 is set, and the jetting gun 5 enters the working state. High-pressure fluid, such as high-pressure water mixed with sand and gravel, is injected into the hollow structure of the jetting gun 5 body 501 through the coiled tubing. In the initial state, the position of the sliding sleeve 502 may cover part of the first through hole, causing some nozzles 503 to be disconnected from the internal fluid channel of the body 501. Depending on the actual perforation operation requirements, if it is necessary to expand the perforation range, an axial thrust can be applied to the sliding sleeve 502 through the control mechanism inside the coiled tubing, such as a hydraulic drive device, causing the sliding sleeve 502 to slide axially along the body 501. As the sliding sleeve 502 moves, the originally covered first through hole is gradually exposed, and more nozzles 503 are connected to the interior of the body 501. High-pressure fluid is then ejected at high speed from more nozzles 503, achieving a larger range and stronger sandblasting perforation. To reduce the perforation range, the control mechanism is reversed, causing the sliding sleeve 502 to move back, partially blocking the first through hole again, reducing the number of nozzles 503 connected to the interior of the body 501.

[0052] The sliding sleeve 502 allows the spray gun 5 to adjust the perforation parameters in real time according to the actual situation, eliminating the need for frequent replacement of the spray gun 5 or complex equipment disassembly and reassembly, saving operation time, improving the efficiency of the entire continuous tubing injection bridge plug 7 operation, and reducing operating costs.

[0053] In some embodiments, the spray gun 5 further includes a second elastic element 504, which is disposed within the body 501 near one end of the sealing tool 6. A sliding sleeve 502 is connected to the second elastic element 504. The sliding sleeve 502 has a hollow structure and is used to receive the action ball 8. The sliding sleeve 502 can slide relative to the body 501 and squeeze the second elastic element 504 under the action of the action ball 8.

[0054] The sliding sleeve 502 can adopt a hollow tube structure design, and the second elastic element 504 can be a spring, a spring pad, or other structures. The second elastic element 504 is located inside the body 501 and close to the side of the sealing tool 6. The second elastic element 504 is located outside the sliding sleeve 502 and connected to the sliding sleeve 502. The hollow structure of the sliding sleeve 502 facilitates the entry of the ball 8 into its interior.

[0055] During the operation of the coiled tubing jet bridge plug combined tool, when the spray gun 5 needs to be activated for sandblasting and perforation, the operator inserts the action ball 8 into the coiled tubing. Under the influence of gravity, the ball slides rapidly down the coiled tubing and eventually falls into the hollow structure of the sliding sleeve 502. The weight of the ball and the impact force generated by its fall exert a downward force on the sliding sleeve 502. Driven by this force, the sliding sleeve 502 begins to slide relative to the body 501 along the axial direction of the body 501, while simultaneously compressing the second elastic element 504. As the sliding sleeve 502 slides, the first through holes on the body 501, which were originally blocked by it, are gradually exposed, allowing these first through holes to connect smoothly with the nozzle 503. At this time, high-pressure fluid can pass sequentially through the interior of the body 501, through the first through holes, and then be ejected at high speed from the nozzle 503, thereby initiating the sandblasting and perforation operation. During the injection process, the high-pressure fluid can provide pressure to the action ball 8, causing the action ball 8 to continuously squeeze the second elastic element 504, preventing the sliding sleeve 502 from sliding under the elastic force of the second elastic element 504.

[0056] When the perforation operation is completed, the sphere is removed from the sliding sleeve 502. At this time, the second elastic element 504, by its own elastic restoring force, pushes the sliding sleeve 502 to slide in the opposite direction, and the sliding sleeve 502 once again blocks the first through hole on the main body 501, thus stopping the sandblasting and perforation operation. Through the cooperation of the second elastic element 504 and the sliding sleeve 502, the spray gun 5 can achieve real-time switching between a 4-hole spray gun 5 and a 6-hole spray gun 5. The working mode of the spray gun 5 can be flexibly adjusted in real time according to different construction needs to meet diverse construction requirements.

[0057] In some embodiments, the circumferential surface of the sliding sleeve 502 is a sealing surface, and the two ends of the sliding sleeve 502 in the axial direction are respectively provided with through holes. The diameter of the through hole near the second elastic member 504 is smaller than the diameter of the acting ball 8, and the diameter of the other through hole is larger than the diameter of the acting ball 8. The sliding sleeve 502 has a first state and a second state under the action of the acting ball 8. In the first state, the sliding sleeve 502 is fixedly connected to the body 501 and can block all the nozzles 503. In the second state, the sliding sleeve 502 is slidably connected to the body 501 and the sliding sleeve 502 can make at least some of the nozzles 503 communicate with the interior of the body 501.

[0058] The end of the sliding sleeve 502 facing the second elastic member 504 can be semi-open. For example, a plate is connected to the side of the sliding sleeve 502 facing the second elastic member 504, and a through hole is provided on the plate. The diameter of the through hole is smaller than the diameter of the actuating ball 8 to prevent the actuating ball 8 from detaching from the sliding sleeve 502. The end of the sliding sleeve 502 facing away from the second elastic member 504 is fully open, and the inner diameter of the sliding sleeve 502 is larger than the diameter of the actuating ball 8, so that the actuating ball 8 can enter the sliding sleeve 502 and abut against the other end of the sliding sleeve 502.

[0059] The coiled tubing jet bridge plug assembly is lowered to the predetermined downhole position. At this point, the sliding sleeve 502 is in its first state, i.e., fixedly connected to the body 501, and its sealing surface seals all nozzles 503 on the body 501. The spray gun 5 is in the closed state to prevent fluid leakage. When it is necessary to activate the spray gun 5 for sandblasting and perforation operations, the working ball 8 is inserted into the coiled tubing. The ball slides down the coiled tubing. Since the diameter of the through hole at one end of the sliding sleeve 502 is larger than the diameter of the ball, the ball smoothly enters the interior of the sliding sleeve 502. The weight of the ball and the impact force generated by its fall act on the sliding sleeve 502, causing the sliding sleeve 502 to overcome the fixed connection force with the body 501 (such as possible friction or initial locking force) and begin to slide relative to the body 501. The sliding sleeve 502 then enters the second state. During the sliding process, the nozzle 503, which was originally blocked by the sliding sleeve 502, gradually connects with the interior of the body 501. High-pressure fluid is ejected at high speed from the hollow structure of the body 501 through the connected nozzle 503 to perform sandblasting and perforation operations.

[0060] The actuating ball 8 triggers the sliding sleeve 502 to transition from the first state to the second state, achieving precise control over the activation of the spray gun 5. The spray gun 5 will only activate after the actuating ball 8 is inserted and enters the sliding sleeve 502, preventing accidental activation and ensuring that the sandblasting operation is performed at the appropriate time. The sealing surface of the circumferential surface of the sliding sleeve 502 ensures that the nozzle 503 is completely blocked in the first state, preventing fluid leakage. In the second state, it reliably allows some or all of the nozzle 503 to communicate with the interior of the body 501, providing a stable fluid jet channel for the sandblasting orifice.

[0061] In some embodiments, the spray gun 5 further includes a shear pin 505. In a first state, the shear pin 505 connects the sliding sleeve 502 and the body 501 respectively, and the shear pin 505 is used to limit the displacement of the sliding sleeve 502 relative to the body 501.

[0062] When the sliding sleeve 502 is installed on the body 501 and placed in the first state, that is, the spray gun 5 is in the closed state of blocking all nozzles 503, the shear pin 505 needs to be connected to the sliding sleeve 502 and the body 501 respectively to limit the displacement of the sliding sleeve 502 relative to the body 501 and maintain the stable structure of the spray gun 5 when it is closed.

[0063] As the ball 8 slides down the coiled tubing into the sleeve 502, the sleeve 502 is subjected to a force attempting to slide relative to the body 501 due to the weight of the ball and the impact force of its fall. When the magnitude of the force exceeds the shear strength of the shear pin 505, the shear pin 505 is sheared off. At this point, the sleeve 502 is freed from the constraint of the shear pin 505 and begins to slide relative to the body 501, entering the second state. This allows at least a portion of the nozzle 503 to communicate with the interior of the body 501, enabling high-pressure fluid to be ejected from the nozzle 503 and initiating the sandblasting and perforation operation.

[0064] The shear pin 505 provides a reliable fixed connection between the sliding sleeve 502 and the body 501, preventing accidental slippage of the sliding sleeve 502 due to factors such as unexpected vibration or fluid pressure fluctuations during tool lowering or other non-operational conditions, ensuring that the spray gun 5 is always in the closed state. By setting an appropriate shear strength for the shear pin 505, the timing of the spray gun 5's activation can be precisely controlled, achieving precise control over the initiation of sandblasting and perforation operations, meeting the stringent requirements for perforation timing in different construction scenarios. Furthermore, the shear pin 505 has a simple structure, low cost, and is easy to replace and maintain, reducing the overall maintenance cost and complexity of the equipment while ensuring the normal operation of the spray gun 5.

[0065] In some embodiments, the spray gun 5 further includes a protective sleeve 506, which is sleeved on the outer periphery of the body 501 and detachably connected to the body 501; the protective sleeve 506 is provided with a plurality of second through holes, which are correspondingly provided with a plurality of first through holes, and the nozzle 503 can pass through the second through holes and be detachably connected to the first through holes of the body 501.

[0066] The protective sleeve 506 is fitted onto the outer periphery of the main body 501. The protective sleeve 506 and the main body 501 are connected in a detachable manner, such as by threaded connection or snap-fit ​​connection, to ensure a secure connection and facilitate subsequent disassembly. The second through hole on the protective sleeve 506 corresponds one-to-one with the first through hole on the main body 501. Multiple nozzles 503 can be sequentially passed through the second through hole on the protective sleeve 506 and detachably connected to the first through hole on the main body 501, for example by threaded connection, to ensure a tight connection and prevent fluid leakage.

[0067] Since the protective sleeve 506 is detachably connected to the main body 501 and the nozzle 503 is detachably connected to the first through hole, if problems such as wear or blockage of the nozzle 503 are found during operation, or if the protective sleeve 506 itself is damaged, the spray gun 5 can be maintained and replaced, making maintenance operations simpler and reducing labor costs and maintenance difficulty.

[0068] The method of using the coiled tubing jet bridge plug coupling tool provided in this application embodiment is as follows:

[0069] Step 1: Conduct coiled tubing cleaning and scraping operations. Use the coiled tubing and related tools to unclog and clean the well passages to ensure unobstructed pipelines and lay a good foundation for subsequent operations.

[0070] Step 2: Using the locator 4, the coiled tubing with bridge plug 7 working tool is used to adjust the depth and is raised to the first perforation point. The ball is dropped to open the spray gun 5 to perform the first perforation. After the perforation is completed, the coiled tubing is pulled out and fracturing operation is carried out.

[0071] Step 3: The coiled tubing with bridge plug 7 is used with the positioning device 4 to adjust the depth, and is raised to the first stage bridge plug 7 setting position. The ball is dropped to set the bridge plug 7 and the spray gun 5 is opened to perform the second stage perforation. After the perforation is completed, the coiled tubing is pulled out and fracturing operation is carried out.

[0072] Step 4: Repeat the above steps to complete the remaining construction;

[0073] Step 5: Use a continuous tubing drill and grinding tool to drill and grind bridge plug 7 to establish a production channel.

[0074] The coiled tubing jetting bridge plug combined tool of this application has significant advantages. First, it breaks the limitation of the number of fracturing stages, allowing construction personnel to flexibly plan stages as needed, facilitating refined formation modification. Second, after the coiled tubing completes sandblasting perforation, it can be immediately retrieved, enabling large-scale formation modification work and greatly improving construction efficiency. Third, the bridge plug 7 setting and coiled tubing sandblasting perforation can be completed simultaneously in a single drilling run, reducing the number of drill string runs and significantly shortening the operation cycle. Fourth, it eliminates the reliance on explosives, reducing safety risks and making on-site resource organization and allocation more convenient, reducing cumbersome procedures and potential hazards. Fifth, the locator 4 in the coiled tubing jetting bridge plug combined tool can accurately position the gas-tight casing 9, achieving precise perforation and fracturing in thin formations. Fifth, the nozzle 503 and protective sleeve 506 can be replaced by the spray gun 5 in the continuous tubing jet bridge plug coupling tool, thereby saving tool usage costs. At the same time, through the sliding sleeve 502 and the elastic structure, the 4-hole spray gun 5 and the 6-hole spray gun 5 can be switched in real time according to actual needs to meet diverse construction requirements.

[0075] The above description is merely a specific embodiment of this application, but the scope of protection of this application is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the scope of the technology disclosed in this application should be included within the scope of protection of this application. Therefore, the scope of protection of this application should be determined by the scope of the claims.

Claims

1. A continuous tubing jet bridge plug coupling tool, characterized in that, include: The components are installed sequentially: oil pipe connector, hydraulic release, centralizer, positioner, spray gun, sealing tool, and bridge plug. The positioner includes a main body and multiple positioning parts. The multiple positioning parts are arranged in a circumferential array around the axis of the main body and are elastically connected to the main body. The positioning part includes a protruding structure that protrudes in the direction opposite to the main axis. The protruding structure includes a first protrusion and a second protrusion. The first protrusion is located near the stabilizer, and the second protrusion is located near the spray gun. The vertical distance from the end of the first protrusion to the axis is not greater than the vertical distance from the end of the second protrusion to the axis. The area enclosed by the plurality of the first protrusions can be larger than the inner diameter of the sleeve.

2. The continuous tubing jet bridge plug coupling tool according to claim 1, characterized in that, The positioner further includes a first elastic element, which is disposed inside the main body; The positioning part is an integrated block structure. The positioning part has a connecting surface on the side opposite to the protruding structure. The connecting surface is connected to the first elastic member. The protruding structure can be displaced relative to the main body in the direction toward the axis by the first elastic member.

3. The continuous tubing jet bridge plug coupling tool according to claim 2, characterized in that, The first elastic element is an arc-shaped structure, and the side of the arc-shaped structure that protrudes outward from its center abuts against the connecting surface.

4. The continuous tubing jet bridge plug coupling tool according to claim 1, characterized in that, The end angles of the first protrusion and the second protrusion on the longitudinal section of the locator are both acute angles.

5. The continuous tubing jet bridge plug coupling tool according to claim 1, characterized in that, The second protrusion further includes an inclined surface, which is disposed away from the first protrusion and at an obtuse angle to the axis.

6. The continuous tubing jet bridge plug coupling tool according to claim 1, characterized in that, The spray gun includes a body, a sliding sleeve, and a nozzle. The body has a hollow structure for introducing fluid. The body is provided with a plurality of first through holes, each of which is used to connect to one of the nozzles; The sliding sleeve is disposed within the body and is slidably connected to the body along the axial direction of the body. The sliding sleeve is used to control the number of nozzles communicating with the interior of the body.

7. The continuous tubing jet bridge plug coupling tool according to claim 6, characterized in that, The spray gun also includes a second elastic element, which is disposed in the body near one end of the sealing tool, and the sliding sleeve is connected to the second elastic element; The sliding sleeve has a hollow structure, which is used to receive the action ball. The sliding sleeve can slide relative to the body and compress the second elastic element under the action of the action ball.

8. The continuous tubing jet bridge plug coupling tool according to claim 7, characterized in that, The circumferential surface of the sliding sleeve is a sealing surface, and through holes are provided at both ends of the sliding sleeve in the axial direction. The diameter of the through hole near the second elastic element is smaller than the diameter of the actuating ball, and the diameter of the other through hole is larger than the diameter of the actuating ball. The sliding sleeve has a first state and a second state under the action of the ball; In the first state, the sliding sleeve is fixedly connected to the body and can block all the nozzles; In the second state, the sliding sleeve is slidably connected to the body, and the sliding sleeve enables at least a portion of the nozzle to communicate with the interior of the body.

9. The continuous tubing jet bridge plug coupling tool according to claim 8, characterized in that, The spray gun also includes a shear pin. In the first state, the shear pin connects the sliding sleeve and the body respectively, and the shear pin is used to limit the displacement of the sliding sleeve relative to the body.

10. The continuous tubing jet bridge plug coupling tool according to claim 6, characterized in that, The spray gun also includes a protective sleeve, which is fitted onto the outer periphery of the body and is detachably connected to the body. The protective sleeve is provided with a plurality of second through holes, which are arranged corresponding to a plurality of first through holes. The nozzle can pass through the second through holes and be detachably connected to the first through holes of the main body.

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