Oilfield acidification rapid layer change plugging device

Abstract

The utility model discloses an oil field acidification quick layer change plugging device, and particularly relates to the technical field of oil field acidification, the oil field acidification quick layer change plugging device comprises a traction rod, the bottom end of the traction rod is provided with an installation structure, the inner side of the installation structure is provided with a plugging structure, and the plugging structure is internally provided with a moving structure; a liquid injection pipeline is connected to one side of the shaft in a penetrating mode, the moving structure comprises a cross frame, and an extrusion rod is fixedly connected to the bottom of the cross frame. According to the rapid layer-changing plugging device for oil field acidification, an extrusion rod pushes a movable extrusion ring plate to move, then a narrow rubber barrel and a wide rubber barrel are extruded to deform, plugging and opening operation can be conveniently conducted on liquid injection pipelines at different positions, then moving structures and plugging structures at different positions can be controlled to work according to requirements during oil field acidification, and the plugging efficiency is improved. Therefore, rapid layer changing operation is achieved, the convenience of oil field acidification work is improved, and the use value of the rapid layer changing plugging device for oil field acidification is increased.

Description

Technical Field

[0001] This utility model relates to the field of oilfield acidizing technology, specifically to a rapid layer replacement and sealing device for oilfield acidizing. Background Technology

[0002] Oilfield acidizing is an important measure for reservoir modification and well production enhancement. It involves injecting acid into the formation, where the acid reacts chemically with components such as carbonate rocks and clay minerals in the reservoir, thereby improving the permeability of the reservoir and the flow of oil, gas, and water, ultimately increasing well production.

[0003] During oilfield acidizing operations, acid is injected into different formations, necessitating the use of a layer-switching and sealing device. In existing operations, the layered acidizing pipes are lowered into the well, and acidizing vehicles, equipment, and surface construction pipelines are laid out. According to the construction design, acid is injected into the current formation. Once the acidizing of the current formation is completed, a layer-switching operation is performed. This typically involves closing the injection valve of the current formation, opening the injection valve of the next formation, adjusting the construction parameters to adapt to the characteristics of the new formation, and continuing to inject acid into the new formation for acidizing.

[0004] The existing technology requires valve adjustment and control during layer replacement in oilfield acidizing, which makes the layer replacement operation inconvenient and cannot quickly replace different formations according to needs. Therefore, there is a need to propose a rapid layer replacement and sealing device for oilfield acidizing. Utility Model Content

[0005] The purpose of this invention is to provide a rapid layer replacement and sealing device for oilfield acidizing, so as to solve the problem of inconvenience in rapid layer replacement mentioned in the background art.

[0006] To achieve the above objectives, this utility model provides the following technical solution: a rapid layer replacement and plugging device for oilfield acidizing, comprising a traction rod, an installation structure installed at the bottom end of the traction rod, a plugging structure installed inside the installation structure, a movable structure installed inside the plugging structure, and a wellbore squeezed and installed on the outer side of the plugging structure, with an injection pipe penetrating one side of the wellbore, the movable structure comprising a cross, a squeezing rod fixedly connected to the bottom of the cross, a movable rod fixedly connected to the bottom of the cross, a movable piston fixedly connected to the outer wall of the movable rod, a threaded cylinder fixedly connected to the bottom end of the movable rod, and a limit cylinder movablely connected to the outer wall of the threaded cylinder;

[0007] The outer side of the limiting cylinder is fixedly connected to a central tube shell, and the inner wall of the threaded cylinder is threadedly connected to a threaded rod. The bottom end of the threaded rod is fixedly installed with a drive motor. The sealing structure includes a movable extrusion ring plate, and a narrow rubber tube is extruded at the bottom of the movable extrusion ring plate. A notch is opened on both sides of the narrow rubber tube. A wide rubber tube is movably arranged on the outer wall of the central tube shell, and a notch is opened on both sides of the wide rubber tube. A fixing ring plate is fixedly connected to the bottom outer wall of the central tube shell.

[0008] Preferably, the mounting structure includes a top mounting base, and a connecting frame is fixedly connected to the bottom of the top mounting base. A bottom mounting base is fixedly connected to the bottom of the fixing ring plate, and a double-ended screw is installed on the internal thread of the bottom mounting base.

[0009] Preferably, both the interior of the top mounting base and the interior of the bottom mounting base are provided with internal threads, and the top mounting base is threadedly installed with the bottom end of the traction rod, and the connecting bracket is correspondingly arranged inside notch one and notch two.

[0010] Preferably, the extrusion rods are symmetrically installed at the bottom of the cross, and the bottom end of the extrusion rods is fixedly connected to the top of the movable extrusion ring plate. The movable rod is movably disposed inside the central tube shell, and the movable piston is fitted inside the central tube shell.

[0011] Preferably, the drive motor is fixedly installed inside the central tube shell, the movable extrusion ring plate is movably disposed on the outer wall of the central tube shell, and the movable extrusion ring plate and the narrow rubber cylinder are alternately arranged and symmetrically disposed on the outside of the central tube shell.

[0012] Preferably, the wide rubber cylinder is located on the outer side of the middle of the central tube shell, and movable extrusion ring plates are provided on both sides of the wide rubber cylinder. After being extruded and deformed, the wide rubber cylinder is horizontally positioned on one side of the injection pipeline.

[0013] Preferably, the moving structure and the sealing structure constitute a layer-changing mechanism, and multiple layer-changing mechanisms are interconnected by an installation structure and are arranged at equal intervals inside the wellbore.

[0014] Compared with the prior art, the beneficial effects of this utility model are: the rapid layer replacement and plugging device for oilfield acidizing;

[0015] 1. By setting up a moving structure and a sealing structure, the extrusion rod pushes the movable extrusion ring plate to move, thereby extruding the narrow and wide rubber cylinders to deform. This allows for sealing of different positions inside the wellbore through the narrow and wide rubber cylinders, facilitating the sealing and opening of injection pipelines at different locations. Furthermore, during oilfield acidizing, the moving structure and sealing structure at different positions can be controlled as needed to achieve rapid layer replacement, thereby improving the convenience of oilfield acidizing operations and increasing the usability of the rapid layer replacement and sealing device for oilfield acidizing.

[0016] 2. The installation structure facilitates the connection and use of the moving structure and the sealing structure. The double-ended screw connects the two layer-changing mechanisms through the top and bottom mounting seats. By changing the double-ended screw of different lengths, the usage positions of the moving structure and the sealing structure can be easily adjusted according to the formation depth, improving the applicability of the rapid layer-changing and sealing device for oilfield acidizing. Adjusting the usage position also facilitates the precise entry of acid into the required formation, improving the accuracy of the rapid layer-changing and sealing device for oilfield acidizing. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the overall structure of this utility model;

[0018] Figure 2 This is a schematic diagram of the sealing structure of this utility model;

[0019] Figure 3 This is a schematic diagram of the movable structure of this utility model;

[0020] Figure 4 This is a schematic diagram showing the usage state of the sealing structure of this utility model;

[0021] Figure 5 This is a schematic diagram showing the position and structure of the bottom mounting base of this utility model;

[0022] Figure 6 This is a schematic diagram of the disassembled sealing structure of this utility model.

[0023] In the diagram: 1. Traction rod; 2. Mounting structure; 21. Top mounting base; 22. Connecting frame; 23. Bottom mounting base; 24. Double-ended screw; 3. Moving structure; 31. Cross; 32. Extrusion rod; 33. Moving rod; 34. Moving piston; 35. Threaded cylinder; 36. Limiting cylinder; 37. Central casing; 38. Threaded rod; 39. Drive motor; 4. Sealing structure; 41. Movable extrusion ring plate; 42. Narrow rubber tube; 43. Notch 1; 44. Wide rubber tube; 45. Notch 2; 46. Fixed ring plate; 5. Wellbore; 6. Injection pipeline. Detailed Implementation

[0024] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0025] Please see Figure 1-6This utility model provides a technical solution: a rapid layer replacement and sealing device for oilfield acidizing, including a traction rod 1. The traction rod 1 facilitates the traction of the layer replacement structure and the easy placement and use of the device. An installation structure 2 is installed at the bottom of the traction rod 1. The installation structure 2 includes a top mounting base 21, and a connecting frame 22 is fixedly connected to the bottom of the top mounting base 21. A bottom mounting base 23 is fixedly connected to the bottom of the fixing ring plate 46, and a double-ended screw 24 is threaded inside the bottom mounting base 23. The double-ended screw 24 can be customized to different lengths, thus facilitating the adjustment of the distance between the moving structure 3 and the sealing structure 4 according to the depth of the formation. This allows the moving structure 3 and the sealing structure 4 to accurately seal the corresponding injection pipe 6 according to the actual usage. The top mounting base 21 has internal and bottom mounting... The interior of the seat 23 is provided with internal threads, and the top mounting seat 21 is threadedly installed with the bottom end of the traction rod 1. The connecting frame 22 is correspondingly set inside the notch 1 43 and notch 2 45. The inner side of the mounting structure 2 is equipped with a sealing structure 4. The interior of the sealing structure 4 is equipped with a moving structure 3. The outer side of the sealing structure 4 is squeezed with a well barrel 5. One side of the well barrel 5 is connected through an injection pipe 6. The moving structure 3 includes a cross 31. The bottom of the cross 31 is fixedly connected with a squeezing rod 32. The bottom of the cross 31 is fixedly connected with a moving rod 33. The outer wall of the moving rod 33 is fixedly connected with a moving piston 34. The moving piston 34 is set to facilitate the limiting of the moving rod 33. The bottom end of the moving rod 33 is fixedly connected with a threaded cylinder 35. The outer wall of the threaded cylinder 35 is movably connected with a limiting cylinder 36.

[0026] A central tube shell 37 is fixedly connected to the outer side of the limiting cylinder 36. Extrusion rods 32 are symmetrically installed at the bottom of the cross 31, and the bottom end of the extrusion rods 32 is fixedly connected to the top of the movable extrusion ring plate 41. A drive motor 39 is fixedly installed inside the central tube shell 37. The movable extrusion ring plate 41 is movably disposed on the outer wall of the central tube shell 37. The movable extrusion ring plate 41 and the narrow rubber cylinder 42 are alternately arranged and symmetrically disposed outside the central tube shell 37. A moving rod 33 is movably disposed inside the central tube shell 37, and a moving piston 34 is fitted inside the central tube shell 37. A threaded rod 38 is threadedly connected to the inner wall of the threaded cylinder 35, and a drive motor 39 is fixedly installed at the bottom end of the threaded rod 38. The sealing structure 4 includes a movable extrusion ring plate 41, and a narrow rubber cylinder 42 is extruded at the bottom of the movable extrusion ring plate 41. Notches 43 are opened on both sides of the narrow rubber cylinder 42. The outer wall of the central tube shell 37 is movably disposed... The use of a wide rubber sleeve 44 and a narrow rubber sleeve 42 facilitates the sealing of a portion of the wellbore 5 by fitting the sleeve to the pipe wall. It also facilitates the sealing of the corresponding injection pipe 6. The wide rubber sleeve 44 is located on the outer side of the middle of the central casing 37, and movable extrusion ring plates 41 are provided on both sides of the wide rubber sleeve 44. After being extruded and deformed, the wide rubber sleeve 44 is horizontally positioned on one side of the injection pipe 6. Notch 45 is provided on both sides of the wide rubber sleeve 44. The notch 43 and notch 45 facilitate the sealing of the injection pipe 6 with the wide rubber sleeve 44 without affecting the flow of acid inside the wellbore 5, thereby facilitating the entry of acid into different formations and enabling rapid layer replacement operations. A fixed ring plate 46 is fixedly connected to the outer wall of the bottom end of the central casing 37. The moving structure 3 and the sealing structure 4 form a layer replacement mechanism, and multiple layer replacement mechanisms are interconnected through the installation structure 2 and are equidistantly arranged inside the wellbore 5.

[0027] Working principle: When using this oilfield acidizing rapid layer replacement and plugging device, the wellbore 5 is placed inside the well, and the injection pipes 6 correspond to different formations on one side. First, select the length of the double-ended screw 24 according to the depth between the formations, and screw the double-ended screw 24 between the top mounting base 21 and the bottom mounting base 23. Then, connect the two layer replacement mechanisms (moving structure 3 and plugging structure 4), and tighten the traction rod 1 inside the top mounting base 21 of the topmost moving structure 3. Then, place the combined layer replacement mechanism downwards inside the wellbore 5. Select the number of moving structures 3 and plugging structures 4 according to the number of acidizing layers, and then use one layer replacement mechanism corresponding to each side of each injection pipe 6. When the moving layer replacement mechanism enters the wellbore 5, move it to the bottom to align multiple layer replacement mechanisms with multiple injection pipes 6 for use. After placement, The layer-changing mechanism on one side of the injection pipe 6 that requires liquid injection is not operated. The drive motor 39 of other layer-changing mechanisms is turned on, which causes the drive motor 39 to drive the threaded rod 38 to rotate. Then, the threaded cylinder 35 moves downward under the limit of the limiting cylinder 36 and the moving piston 34. Next, the cross 31 drives the extrusion rod 32 to press the movable extrusion ring plate 41 downward, which in turn moves the movable extrusion ring plate 41 and the narrow rubber cylinder 42 downward, and extrudes the wide rubber cylinder 44. This causes the narrow rubber cylinder 42 and the wide rubber cylinder 44 between the movable extrusion ring plate 41 and the fixed ring plate 46 to be extruded and deformed, so that the wide rubber cylinder 44 extrudes and blocks the corresponding injection pipe 6. At the same time, the acid flows out through the notch 1 43 and the notch 2 45, so that the unblocked injection pipe 6 can be filled with acid. This makes it convenient to carry out liquid injection operations on different formations according to needs, and also facilitates rapid layer-changing operations.

[0028] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A rapid layer replacement and plugging device for oilfield acidizing, comprising a traction rod (1), characterized in that: The bottom end of the traction rod (1) is equipped with an installation structure (2), and the inner side of the installation structure (2) is equipped with a sealing structure (4). The inside of the sealing structure (4) is equipped with a moving structure (3), and the outer side of the sealing structure (4) is squeezed with a well barrel (5). One side of the well barrel (5) is connected to an injection pipe (6). The moving structure (3) includes a cross (31), and the bottom of the cross (31) is fixedly connected with a squeezing rod (32). The bottom of the cross (31) is fixedly connected with a moving rod (33), and the outer wall of the moving rod (33) is fixedly connected with a moving piston (34). The bottom end of the moving rod (33) is fixedly connected with a threaded cylinder (35), and the outer wall of the threaded cylinder (35) is movably connected with a limit cylinder (36). The outer side of the limiting cylinder (36) is fixedly connected to the central tube shell (37), and the inner wall of the threaded cylinder (35) is threadedly connected to the threaded rod (38). The bottom end of the threaded rod (38) is fixedly installed with a drive motor (39). The sealing structure (4) includes a movable extrusion ring plate (41), and a narrow rubber cylinder (42) is extruded at the bottom of the movable extrusion ring plate (41). A notch (43) is opened on both sides of the narrow rubber cylinder (42). A wide rubber cylinder (44) is movably arranged on the outer wall of the central tube shell (37), and a notch (45) is opened on both sides of the wide rubber cylinder (44). A fixed ring plate (46) is fixedly connected to the bottom outer wall of the central tube shell (37).

2. The rapid layer replacement and plugging device for oilfield acidizing according to claim 1, characterized in that, The mounting structure (2) includes a top mounting base (21), and a connecting frame (22) is fixedly connected to the bottom of the top mounting base (21). The bottom of the fixing ring plate (46) is fixedly connected to a bottom mounting base (23), and a double-ended screw (24) is installed on the internal thread of the bottom mounting base (23).

3. The rapid layer replacement and plugging device for oilfield acidizing according to claim 2, characterized in that, The top mounting base (21) and the bottom mounting base (23) are both provided with internal threads, and the top mounting base (21) is threaded to the bottom end of the traction rod (1). The connecting frame (22) is correspondingly provided inside the notch one (43) and the notch two (45).

4. The rapid layer replacement and plugging device for oilfield acidizing according to claim 1, characterized in that, The extrusion rod (32) is symmetrically installed at the bottom of the cross (31), and the bottom end of the extrusion rod (32) is fixedly connected to the top of the movable extrusion ring plate (41). The moving rod (33) is movably disposed inside the central tube shell (37), and the moving piston (34) is fitted inside the central tube shell (37).

5. The rapid layer replacement and plugging device for oilfield acidizing according to claim 1, characterized in that, The drive motor (39) is fixedly installed inside the central tube shell (37), the movable extrusion ring plate (41) is movably disposed on the outer wall of the central tube shell (37), and the movable extrusion ring plate (41) and the narrow rubber cylinder (42) are alternately arranged and symmetrically disposed on the outside of the central tube shell (37).

6. The rapid layer replacement and plugging device for oilfield acidizing according to claim 1, characterized in that, The wide rubber cylinder (44) is located on the outer side of the middle part of the central tube shell (37), and movable extrusion ring plates (41) are provided on both sides of the wide rubber cylinder (44). After the wide rubber cylinder (44) is extruded and deformed, it is horizontally located on one side of the injection pipe (6).

7. The rapid layer replacement and plugging device for oilfield acidizing according to claim 1, characterized in that, The moving structure (3) and the sealing structure (4) form a layer-changing mechanism, and multiple layer-changing mechanisms are interconnected through the installation structure (2) and are arranged at equal intervals inside the wellbore (5).

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