Quick dissolving structure of dissolvable bridge plug

Abstract

The utility model relates to oil and gas development fracturing tool technical field provides a quick dissolving structure of soluble bridge plug, including accelerating dissolving auxiliary structure: accelerating dissolving auxiliary structure symmetry is installed in both ends of dissolving main part structure, dissolving main part structure: the dissolving main part structure includes bridge plug matrix, openwork framework, radial dissolving hole and axial guide flow passage, the openwork framework is integrally formed in the inside of bridge plug matrix, the utility model discloses through setting accelerating dissolving auxiliary structure, temperature sensitive trigger piece reaches the preset value when downhole temperature after fracturing, triggers electrolytic acceleration unit work, forms local electrolytic cell and accelerates the electrochemistry of magnesium alloy matrix and dissolves, and one-way valve opens after fracturing pressure disappears simultaneously, and slow -release type dissolving accelerator capsule releases composite accelerator, diffuses to each dissolving interface through guide branch groove, can maintain higher dissolving rate even in low temperature environment, breaks through the temperature adaptability limit of traditional structure.

Description

Technical Field

[0001] This utility model relates to the field of fracturing tools for oil and gas development, and in particular to a rapid dissolution structure for a soluble bridge plug. Background Technology

[0002] Dissolvable bridge plugs are self-dissolving tools used in oil and gas well fracturing operations to temporarily plug formations and separate fracturing sections without the need for subsequent drilling and grinding removal. The rapid dissolution structure of dissolvable bridge plugs is a key feature that increases the contact area with downhole fluids and reduces dissolution resistance by optimizing material distribution and shape design. The core objective is to shorten the dissolution cycle.

[0003] Existing dissolvable bridge plugs have a simple dissolution structure design, relying solely on a static tank structure. In low-temperature or low-salinity formation water environments, the dissolution reaction rate is slow, making it difficult to completely dissolve within the preset timeframe. At the same time, existing structures lack an active acceleration mechanism. When downhole fluid flow is poor, dissolution products tend to accumulate inside the tank, forming a dissolution resistance layer, further delaying the dissolution process. Moreover, the dissolution status cannot be monitored in real time, which can easily lead to blockage of oil and gas production channels due to incomplete dissolution, reducing development efficiency. Utility Model Content

[0004] The purpose of this invention is to provide a rapid dissolution structure for soluble bridge plugs, in order to solve the defects of low dissolution efficiency and poor low-temperature adaptability of existing rapid dissolution structures for soluble bridge plugs.

[0005] To solve the above-mentioned technical problems, this utility model provides the following technical solution: a rapid dissolution structure for dissolving bridge plugs, comprising a dissolution body structure;

[0006] Accelerated dissolution auxiliary structure: The accelerated dissolution auxiliary structure is symmetrically installed at both ends of the dissolution main structure;

[0007] Dissolution host structure: The dissolution host structure includes a bridge plug matrix, a hollow skeleton, radial dissolution holes, and axial flow channels;

[0008] The hollow skeleton is integrally formed inside the bridge plug substrate. Radial dissolution holes are evenly opened on the side wall of the bridge plug substrate. The axial flow channel is opened through the central axis of the bridge plug substrate, and the axial flow channel and the radial dissolution holes are interconnected.

[0009] Accelerated dissolution aid structure: The accelerated dissolution aid structure includes an electrolysis acceleration unit, a slow-release dissolution promoter capsule, a one-way valve, and a flow guide branch groove;

[0010] The electrolysis acceleration unit is embedded in the node of the hollow skeleton. The slow-release dissolution accelerator capsules are evenly distributed in the gaps of the hollow skeleton. The one-way valve is fixedly connected to the outlet end of the slow-release dissolution accelerator capsule. The flow guide branch groove is opened on the inner wall of the bridge plug substrate, and the flow guide branch groove is connected to the radial dissolution hole and the outlet end of the slow-release dissolution accelerator capsule respectively.

[0011] Preferably, the accelerated dissolution aid structure further includes a temperature-sensitive trigger and a pressure transmission hole;

[0012] The temperature-sensitive trigger is fixedly connected to the outer wall of the sustained-release dissolution promoter capsule, and the pressure transmission holes are opened at both ends of the bridge plug substrate.

[0013] Preferably, the electrolysis acceleration unit is composed of a magnesium alloy anode sheet and a graphite cathode sheet, and the electrolysis acceleration unit is electrically connected to a temperature-sensitive trigger via a wire.

[0014] Preferably, the pressure transmission hole is connected to the interior of the hollow skeleton, and the inner wall of the flow guide branch groove is roughened by micro-etching.

[0015] Preferably, the dissolvable main structure further includes a segmented connecting seat and a dissolvable pin;

[0016] The segmented connector is fixedly connected to both ends of the bridge plug base by a soluble pin, and the segmented connector has a through hole inside that corresponds to the axial flow channel.

[0017] Preferably, it also includes a dissolution monitoring structure;

[0018] The dissolution monitoring structure includes a dissolution state sensor, a signal transmission module, a protective cover, a rotating drum, and a rotating gear.

[0019] The dissolution state sensor is embedded inside the segmented connector. The signal transmission module is fixedly connected to one side of the dissolution state sensor. The protective cover is installed at one end of the signal transmission module. The rotating drum is rotatably connected inside the signal transmission module. The rotating gear is rotatably connected to the center of the signal transmission module.

[0020] Preferably, the dissolution monitoring structure further includes a threaded rod, a battery compartment, a screw barrel, and a storage battery;

[0021] The threaded rod is fixedly connected to the top of the rotating gear, the screw barrel is threadedly connected to the top of the threaded rod, the battery compartment is fixedly connected to the top of the screw barrel, and the battery is installed inside the battery compartment.

[0022] The present invention provides a rapid dissolution structure for dissolving bridge plugs, the advantages of which are:

[0023] By setting up an accelerated dissolution auxiliary structure, the temperature-sensitive triggering element triggers the electrolysis acceleration unit to work when the downhole temperature reaches a preset value after fracturing, forming a local electrolysis cell to accelerate the electrochemical dissolution of the magnesium alloy matrix; at the same time, after the fracturing pressure disappears, the one-way valve opens, and the slow-release dissolution promoter capsule releases the composite promoter, which diffuses to each dissolution interface through the diversion branch groove, maintaining a high dissolution rate even in low temperature environments, breaking through the temperature adaptability limitations of traditional structures.

[0024] By incorporating a dissolution monitoring structure and utilizing the coordination between a dissolution status sensor and a signal transmission module, the screw can be guided upwards along the threaded trajectory outside the screw rod while the drum is rotating. This enables visualized control of the dissolution process, reducing operational risks and facilitating battery replacement by staff. Attached Figure Description

[0025] Figure 1 This is an axonometric view of the present invention;

[0026] Figure 2 This is a three-dimensional schematic diagram of the bridge plug substrate of this utility model;

[0027] Figure 3 This is a three-dimensional schematic diagram of the segmented connector of this utility model;

[0028] Figure 4 This is a three-dimensional sectional view of the segmented connector of this utility model;

[0029] Figure 5 This is a three-dimensional schematic diagram of the battery compartment of this utility model.

[0030] Explanation of the reference numerals in the figure:

[0031] 11. Bridge plug substrate; 12. Hollowed-out skeleton; 13. Radial dissolving hole; 14. Axial flow channel; 15. Segmented connector; 16. Dissolvable pin;

[0032] 21. Electrolysis acceleration unit; 22. Slow-release dissolution promoter capsule; 23. One-way valve; 24. Flow guide branch groove; 25. Temperature-sensitive trigger; 26. Pressure transmission hole;

[0033] 31. Dissolution state sensor; 32. Signal transmission module; 33. Protective cover; 34. Rotating drum; 35. Rotating gear; 36. Threaded rod; 37. Battery compartment; 38. Screw barrel; 39. Storage battery. Detailed Implementation

[0034] 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.

[0035] Please see Figures 1-5 The present invention provides a rapid dissolution structure for a soluble bridge plug, comprising a dissolution body structure;

[0036] Accelerated dissolution auxiliary structure: The accelerated dissolution auxiliary structure is symmetrically installed at both ends of the main dissolution structure;

[0037] The dissolution body structure includes a bridge plug matrix 11, a hollow skeleton 12, radial dissolution holes 13, and axial flow channels 14.

[0038] The hollow skeleton 12 is integrally formed inside the bridge plug substrate 11. The radial dissolution holes 13 are evenly opened on the side wall of the bridge plug substrate 11. The axial flow channel 14 is opened through the central axis of the bridge plug substrate 11, and the axial flow channel 14 and the radial dissolution holes 13 are interconnected.

[0039] The dissolvable main structure also includes a segmented connector 15 and a dissolvable pin 16;

[0040] The segmented connector 15 is fixedly connected to both ends of the bridge plug base 11 by a soluble pin 16, and the segmented connector 15 has a through hole corresponding to the axial flow channel 14.

[0041] During fracturing operations, the bridge plug is seated at a predetermined layer, and the axial flow channel 14 serves as a flow channel for fracturing fluid. After fracturing is completed, the downhole fluid permeates into the hollow skeleton 12 through the radial dissolution holes 13, forming a multi-dimensional dissolution interface. As dissolution proceeds, the dissolvable pin 16 breaks first, and the segmented connecting seat 15 separates from the bridge plug matrix 11. The matrix is ​​dispersed into 3 to 4 segments, each segment maintaining a honeycomb structure, further expanding the contact range with the fluid and accelerating the overall dissolution process.

[0042] Accelerated dissolution aid structure: The accelerated dissolution aid structure includes an electrolysis acceleration unit 21, a slow-release dissolution promoter capsule 22, a one-way valve 23, and a flow guiding branch groove 24;

[0043] An electrolysis acceleration unit 21 is embedded in the node of the hollow skeleton 12. The slow-release dissolution accelerator capsule 22 is evenly distributed in the gap of the hollow skeleton 12. The one-way valve 23 is fixedly connected to the outlet end of the slow-release dissolution accelerator capsule 22. The flow guide branch groove 24 is opened on the inner wall of the bridge plug substrate 11, and the flow guide branch groove 24 is connected to the radial dissolution hole 13 and the outlet end of the slow-release dissolution accelerator capsule 22 respectively.

[0044] The accelerated dissolution aid structure also includes a temperature-sensitive trigger 25 and a pressure transmission hole 26;

[0045] Temperature-sensitive trigger 25 is fixedly connected to the outer wall of sustained-release dissolution promoter capsule 22, and pressure transmission holes 26 are opened at both ends of bridge plug substrate 11;

[0046] The electrolysis acceleration unit 21 is composed of magnesium alloy anode sheet and graphite cathode sheet, and the electrolysis acceleration unit 21 is electrically connected to the temperature sensitive trigger 25 through wires. The pressure transmission hole 26 is connected to the interior of the hollow skeleton 12, and the inner wall of the flow guide branch groove 24 is roughened by micro-etching.

[0047] By setting up an accelerated dissolution auxiliary structure, the temperature-sensitive trigger 25 triggers the electrolysis acceleration unit 21 to work when the downhole temperature reaches a preset value after fracturing, forming a local electrolysis cell to accelerate the electrochemical dissolution of the magnesium alloy matrix.

[0048] Working principle: During fracturing operations;

[0049] First, when the downhole pressure is higher than the opening pressure of the one-way valve 23, the valve body is closed and the promoter bladder remains sealed. After fracturing is completed, the downhole pressure drops to atmospheric pressure, the one-way valve 23 opens, and the promoter begins to be released slowly. It diffuses through the guide branch groove 24 into the radial dissolution hole 13 and the hollow skeleton 12, reducing the activation energy of magnesium alloy dissolution.

[0050] Then, when the downhole temperature rises to 50°C, the temperature-sensitive trigger 25 deforms, connecting the circuit of the electrolysis acceleration unit 21. The anode plate undergoes an electrochemical dissolution reaction, and hydrogen gas is generated on the surface of the cathode plate, forming local turbulence and accelerating the discharge of dissolution products. Even in low-temperature well conditions below 60°C, the dissolution rate can be increased by 30% to 50%.

[0051] This step allows the bridge plug to maintain a high dissolution rate even at low temperatures, overcoming the temperature adaptability limitations of traditional structures.

[0052] Please see Figure 1-3 As shown, this embodiment, based on the above embodiment, also includes a dissolution monitoring structure;

[0053] The dissolution monitoring structure includes a dissolution state sensor 31, a signal transmission module 32, a protective cover 33, a rotating drum 34, and a rotating gear 35.

[0054] The dissolution state sensor 31 is embedded inside the segmented connector 15. The signal transmission module 32 is fixedly connected to one side of the dissolution state sensor 31. The protective cover 33 is installed at one end of the signal transmission module 32. The rotating drum 34 is rotatably connected inside the signal transmission module 32. The rotating gear 35 is rotatably connected to the center of the inside of the signal transmission module 32.

[0055] The dissolution monitoring structure also includes a threaded rod 36, a battery compartment 37, a screw barrel 38, and a storage battery 39;

[0056] The threaded rod 36 is fixedly connected to the top of the rotating gear 35, the screw barrel 38 is threadedly connected to the top of the threaded rod 36, the battery compartment 37 is fixedly connected to the top of the screw barrel 38, and the battery 39 is installed inside the battery compartment 37.

[0057] The bottom inner side of the rotating drum 34 is provided with a toothed groove, the rotating drum 34 and the rotating gear 35 are meshed, the threaded rod 36 and the screw barrel 38 are threaded, and the battery compartment 37 is used to provide space for the installation of the battery 39.

[0058] With the assistance of the melting state sensor 31 and the signal transmission module 32, when the rotating drum 34 is rotated, the screw 38 can be guided to rise inside the rotating drum 34 along the threaded trajectory outside the threaded rod 36.

[0059] Working principle: When staff replace the battery;

[0060] First, by disconnecting the connection between the signal transmission module 32 and the protective cover 33, rotating the drum 34 clockwise allows the drum 34 to rotate while simultaneously engaging with the rotating gear 35.

[0061] Next, the rotating gear 35 can drive the threaded rod 36 to rotate, and the screw barrel 38 can be guided to rise inside the rotating barrel 34 along the threaded track outside the threaded rod 36, which can facilitate the staff to quickly remove and replace the battery 39 installed inside the battery compartment 37.

[0062] This step enables visual control of the dissolution process, reducing operational risks and facilitating the replacement of battery 39 by staff.

[0063] Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A rapid dissolution structure for dissolving bridge plugs, comprising a dissolution host structure, characterized in that: Accelerated dissolution auxiliary structure: The accelerated dissolution auxiliary structure is symmetrically installed at both ends of the dissolution main structure; Dissolution host structure: The dissolution host structure includes a bridge plug matrix (11), a hollow skeleton (12), radial dissolution holes (13), and axial flow channels (14); The hollow skeleton (12) is integrally formed inside the bridge plug substrate (11), the radial dissolution holes (13) are evenly opened on the side wall of the bridge plug substrate (11), and the axial flow channel (14) is opened through the central axis of the bridge plug substrate (11), and the axial flow channel (14) and the radial dissolution holes (13) are interconnected. Accelerated dissolution aid structure: The accelerated dissolution aid structure includes an electrolysis acceleration unit (21), a slow-release dissolution promoter capsule (22), a one-way valve (23), and a flow guiding branch groove (24); The electrolysis acceleration unit (21) is embedded in the node of the hollow skeleton (12), the slow-release dissolution promoter capsule (22) is evenly distributed in the gap of the hollow skeleton (12), the one-way valve (23) is fixedly connected to the outlet end of the slow-release dissolution promoter capsule (22), the flow guide branch groove (24) is opened on the inner wall of the bridge plug substrate (11), and the flow guide branch groove (24) is connected to the radial dissolution hole (13) and the outlet end of the slow-release dissolution promoter capsule (22) respectively.

2. The rapid dissolution structure for a soluble bridge plug according to claim 1, characterized in that, The accelerated dissolution aid structure also includes a temperature-sensitive trigger (25) and a pressure transmission hole (26); The temperature-sensitive trigger (25) is fixedly connected to the outer wall of the sustained-release dissolution promoter capsule (22), and the pressure transmission hole (26) is opened at both ends of the bridge plug substrate (11).

3. The rapid dissolution structure for a soluble bridge plug according to claim 2, characterized in that, The electrolysis acceleration unit (21) is composed of a magnesium alloy anode sheet and a graphite cathode sheet, and the electrolysis acceleration unit (21) is electrically connected to the temperature-sensitive trigger (25) through a wire.

4. The rapid dissolution structure for a soluble bridge plug according to claim 2, characterized in that, The pressure transmission hole (26) is connected to the interior of the hollow skeleton (12), and the inner wall of the flow guide branch groove (24) is roughened by micro-etching.

5. The rapid dissolution structure for a soluble bridge plug according to claim 1, characterized in that, The dissolution main structure also includes a segmented connecting seat (15) and a dissolvable pin (16); The segmented connector (15) is fixedly connected to both ends of the bridge plug base (11) by a soluble pin (16), and the segmented connector (15) has a through hole corresponding to the axial flow channel (14).

6. The rapid dissolution structure for a soluble bridge plug according to claim 1, characterized in that, It also includes a dissolution monitoring structure; The dissolution monitoring structure includes a dissolution state sensor (31), a signal transmission module (32), a protective cover (33), a rotating drum (34), and a rotating gear (35); The dissolution state sensor (31) is embedded inside the segmented connector (15), the signal transmission module (32) is fixedly connected to one side of the dissolution state sensor (31), the protective cover (33) is installed at one end of the signal transmission module (32), the rotating drum (34) is rotatably connected to the inside of the signal transmission module (32), and the rotating gear (35) is rotatably connected to the center of the inside of the signal transmission module (32).

7. The rapid dissolution structure for a soluble bridge plug according to claim 6, characterized in that, The dissolution monitoring structure also includes a threaded rod (36), a battery compartment (37), a screw barrel (38), and a storage battery (39); The threaded rod (36) is fixedly connected to the top of the rotating gear (35), the screw barrel (38) is threadedly connected to the top of the threaded rod (36), the battery compartment (37) is fixedly connected to the top of the screw barrel (38), and the battery (39) is installed inside the battery compartment (37).

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