Switch-controlled downhole corrosion inhibitor dispersal device

Abstract

The utility model discloses a switch controllable's downhole corrosion inhibitor dispersion device, including outer shell, inner core, the outer shell includes the cylinder, guide bushing, connecting sleeve that connect gradually, the cylinder, guide bushing between form inner transition step, the inner core is connected with the cylinder inner wall, the inner core lower extreme is closed, the inner core, guide bushing set radial through dispersion mouth, the annular liquid drive gate of between the inner core, guide bushing sets up, controls dispersion mouth on-off, the inner core inside is used for filling medicament, the cylinder inner end face sets up self force mechanism, and the corrosion inhibitor of inner core inside is pressed out. The utility model sets up liquid drive gate, and the opening size of mediation dispersion mouth, when fluid flow is big, and dispersion device opening is adjusted big, and it is guaranteed that there is sufficient corrosion inhibitor to enter the fluid, when fluid flow is small, and dispersion device opening is adjusted small, and the filling frequency of corrosion inhibitor is reduced.

Description

Technical Field

[0001] This utility model relates to the field of petroleum development technology, specifically to a switchable downhole corrosion inhibitor dispersion device. Background Technology

[0002] In the process of oil and gas extraction, especially in downhole environments, corrosion problems of equipment and pipelines are becoming increasingly serious due to the presence of high temperatures, high pressures, and corrosive fluids. This corrosion not only leads to equipment degradation and failure, thus affecting production efficiency, but also poses potential environmental hazards. Therefore, the use of corrosion inhibitors has become an important means of ensuring equipment safety and extending its service life.

[0003] Existing downhole corrosion inhibitor dispersion devices are mainly simple cylindrical structures with openings around the perimeter or bottom to facilitate contact between the fluid and the corrosion inhibitor inside the cylinder. The inhibitor is then dispersed and dissolved in the fluid after being flushed out. Traditional dispersion devices cannot control the on / off state or adjust the contact area between the corrosion inhibitor and the fluid, making it difficult to precisely control the dispersion rate and amount of the corrosion inhibitor. Excessive dispersion of the corrosion inhibitor leads to insufficient dispersion in the fluid during the later stages of oil production, causing damage to downhole equipment due to increased corrosion rates and increasing the frequency of corrosion inhibitor refilling. Insufficient dispersion fails to effectively protect downhole equipment.

[0004] To control isotope release in a time-sharing manner, Li Yuhui proposed a multi-stage isotope release device for injection profiles (Li Yuhui. Design and application of a multi-stage isotope release device for injection profiles [J]. Petroleum Pipes & Instruments, 2021, 7(02): 28-31). This multi-stage isotope release device uses a motor to actively control isotope release. At the bottom of the well being logged, the motor activates the first-stage isotope release, and at the top of the perforated layer, the motor activates the second-stage isotope release. The problem it solves is that the isotope release switch cannot be actively controlled. This device is mainly used to adjust the opening size of the dispersion device; when the fluid flow rate is high, the opening of the dispersion device is enlarged to ensure sufficient corrosion inhibitor enters the fluid; when the fluid flow rate is low, the opening of the dispersion device is reduced to decrease the filling frequency of the corrosion inhibitor. The problem it solves is that traditional devices cannot adjust the opening size of the dispersion port according to the fluid flow rate, easily resulting in excessive or insufficient corrosion inhibitor dispersion. This multi-stage isotope release device for injection profiles also has this problem.

[0005] Announcement No. CN112392439B discloses a downhole chemical control and release device and control method for oil and water wells. The device has through holes in the middle of both the first and second chemical storage sections along their length. One end of the first chemical storage section is connected to one end of the second chemical storage section. A soluble partition is also provided between the end faces of the connection between the first and second chemical storage sections. The through hole cavity inside the first chemical storage section above the soluble partition is a chemical storage cavity.

[0006] Announcement No.: CN220101256U discloses a device for using downhole slow-release solid agents, including an oil pump, one end of which is connected to a sand setter pipe, and the other end of which is connected to a perforated pipe; a plug is provided at the connection between the perforated pipe and the sand setter pipe, and a sealing plug is provided at the other end of the perforated pipe; multiple holes are evenly provided on the surface of the perforated pipe, and a shielding net is provided on the outer surface of the perforated pipe.

[0007] Announcement No. CN106593358B discloses a relay-type release device for chemicals in oil wells. An upper flow channel control plug is installed on the upper part of the upper chemical releaser, and a lower flow channel control plug is installed on the upper part of the lower chemical releaser. A tubing coupling, inlet screen pipe, variable-thread coupling, upper chemical releaser, upper chemical storage pipe, middle coupling, lower flow channel control plug, lower chemical releaser, lower chemical storage pipe, and bottom sealing head are connected in sequence. The inlet screen pipe has connecting screen holes, the upper chemical releaser has an upper chemical release hole, and the lower chemical releaser has a lower chemical release hole. Solid corrosion and scale inhibitors are placed in the upper chemical releaser and the upper chemical storage pipe, and solid corrosion and scale inhibitors are placed in the lower chemical releaser and the lower chemical storage pipe. The lower chemical release hole is sealed with composite anode material. The upper and lower chemical releasers release corrosion and scale inhibitors in a relay manner.

[0008] The existing technology described above is not as good as this patent in terms of the controllability of drug release.

[0009] In summary, the technical solutions, technical problems to be solved, and beneficial effects of the above-disclosed technologies are all different from those of this utility model. For more technical features, technical problems to be solved, and beneficial effects of this utility model, the above-disclosed technical documents do not provide any technical inspiration. Utility Model Content

[0010] In order to overcome the shortcomings of the prior art and solve at least one of the technical problems mentioned in the background art, the present invention provides a switchable downhole corrosion inhibitor dispersion device.

[0011] To achieve the above objectives, the present invention adopts the following technical solution:

[0012] A switchable downhole corrosion inhibitor dispersion device includes an outer shell and an inner core. The outer shell includes a cylinder, a guide sleeve, and a connecting sleeve connected in sequence, with an inner transition step formed between the cylinder and the guide sleeve. The inner core is connected to the inner wall of the cylinder, and its lower end is closed. The inner core and the guide sleeve are provided with radially penetrating dispersion ports. A liquid-driven gate is provided annularly between the inner core and the guide sleeve to control the opening and closing of the dispersion ports. The interior of the inner core is used to fill the agent, and a self-pressurizing mechanism is provided on the inner end face of the cylinder to externally pressurize the corrosion inhibitor inside the inner core.

[0013] Furthermore, the hydraulically driven gate includes a hydraulic chamber spring and a baffle plate;

[0014] The baffle plate is annular and is arranged in a ring between the guide sleeve and the inner core. The baffle plate and the inner transition step form a hydraulic cavity. The guide sleeve is provided with a hydraulic control port communicating with the hydraulic cavity. A hydraulic cavity spring is provided between the baffle plate and the inner transition step.

[0015] Furthermore, the self-applying mechanism includes a medicine chamber spring and an applying plate;

[0016] The spring in the drug chamber is disposed between the force-adding plate and the inner end face of the cylinder, and the outer wall of the force-adding plate is fitted with the inner wall of the inner core with a clearance.

[0017] Furthermore, the connecting sleeve connects to the plug, and the upper end of the plug is provided with a boss, which is inserted into the inner core to seal the lower end of the inner core.

[0018] Furthermore, a convex ring is provided on the lower outer wall of the guide sleeve, and the outer wall of the convex ring is in clearance fit with the connecting sleeve. The convex ring serves as a lower positioning element for the baffle plate.

[0019] Furthermore, the connecting sleeve is radially provided with a first pin hole, and the inner core is provided with a second pin hole on the convex ring corresponding to the first pin hole. Pins are inserted into the first pin hole and the second pin hole to strengthen the connection.

[0020] Furthermore, the guide sleeve has an outer dispersion port at one end near the connecting sleeve, and the inner core has an inner dispersion port corresponding to the outer dispersion port. The outer dispersion port and the inner dispersion port together form a dispersion port.

[0021] At least two dispersion ports are evenly arranged around the dispersion device.

[0022] Furthermore, the outer dispersion port and the inner dispersion port are correspondingly rectangular, and the upper end face of the plug protrusion is flush with the lower edge of the inner dispersion port.

[0023] Furthermore, the hydraulic chamber spring is a large spring sleeved on the outer wall of the inner core, or at least three small springs evenly distributed along the circumference of the inner core.

[0024] Furthermore, the outer diameter of the drug cavity spring is the same as the inner diameter of the inner core, or the outer diameter of the drug cavity spring is smaller than the inner diameter of the inner core, and a spring seat is provided at the center of the cylinder and the force plate to restrict the position of the drug cavity spring.

[0025] Compared with the prior art, the present invention has the following advantages:

[0026] 1. In traditional devices, after the corrosion inhibitor is consumed, the fluid needs to flow into the reagent chamber for the inhibitor to disperse. However, the inside of the reagent chamber is a dead zone, and the probability of fluid flowing out after entering the chamber is very small. This results in very little inhibitor dispersion in the fluid later, leading to corrosion of downhole equipment. This device, by incorporating a spring and pressure plate in the reagent chamber, applies downward pressure to the corrosion inhibitor, ensuring it is located at the bottom of the chamber. This allows the external fluid to directly contact the inhibitor, improving its dispersion ability within the fluid.

[0027] 2. Traditional devices only have a dispersion port, but the opening size cannot be adjusted according to the fluid flow rate, easily leading to excessive or insufficient corrosion inhibitor dispersion. Excessive dispersion results in insufficient corrosion inhibitor in the later stages of mining, causing equipment corrosion damage. If corrosion inhibitor is added, excessive dispersion also increases the filling frequency, increasing production costs. Insufficient dispersion fails to protect downhole equipment from corrosion. This device is equipped with a hydraulic control port, a hydraulic chamber spring, and a baffle plate. By adjusting the amount of hydraulic oil in the hydraulic chamber, the position of the baffle plate can be adjusted, thus regulating the opening size of the dispersion device. When the fluid flow rate is high, the dispersion device opening is enlarged to ensure sufficient corrosion inhibitor enters the fluid; when the fluid flow rate is low, the dispersion device opening is reduced to decrease the corrosion inhibitor filling frequency. Attached Figure Description

[0028] Figure 1 This is a schematic diagram of the structure of a switch-controllable downhole corrosion inhibitor dispersion device according to this utility model.

[0029] Figure 2 This is a schematic diagram of the outer shell structure in this utility model. Figure 1 .

[0030] Figure 3 This is a schematic diagram of the outer shell structure in this utility model. Figure 2 .

[0031] Figure 4 This is a schematic diagram of the inner core structure in this utility model. Figure 1 .

[0032] Figure 5 This is a schematic diagram of the inner core structure in this utility model. Figure 2 .

[0033] Figure 6 This is a schematic diagram of another embodiment of the present invention.

[0034] In the figure: outer shell 1, cylinder 1.1, guide sleeve 1.2, connecting sleeve 1.3, inner transition step 1.4, hydraulic control port 2, outer dispersion port 3, hydraulic chamber spring 4, baffle plate 5, pin 6, first pin hole 6.1, second pin hole 6.2, inner core 7, convex ring 7.1, inner dispersion port 8, agent chamber spring 9, force plate 10, plug 11. Detailed Implementation

[0035] 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.

[0036] Please see Figures 1 to 6 This utility model provides a switchable downhole corrosion inhibitor dispersion device, including an outer shell 1 and an inner core 7. The outer shell 1 includes a cylinder 1.1, a guide sleeve 1.2, and a connecting sleeve 1.3 connected in sequence. The opening of the cylinder 1.1 faces downward. An inner transition step 1.4 is formed between the cylinder 1.1 and the guide sleeve 1.2. The inner core 7 is tubular and connected to the inner wall of the cylinder 1.1. The connecting sleeve 1.3 is connected to a plug 11 to seal the lower end of the inner core 7. The inner core 7 and the guide sleeve 1.2 are provided with a radially penetrating dispersion port. A liquid-driven gate is provided annularly between the inner core 7 and the guide sleeve 1.2 to control the opening and closing of the dispersion port. The inner core 7 is used to fill the agent. A self-pressurizing mechanism is provided on the inner end face of the cylinder 1.1 to press the corrosion inhibitor inside the inner core 7 externally.

[0037] Specifically, the cylinder 1.1, guide sleeve 1.2, and connecting sleeve 1.3 are an integral structure.

[0038] Specifically, a protruding ring 7.1 is provided on the lower outer wall of the guide sleeve 1.2, and the outer wall of the protruding ring 7.1 is in clearance fit with the connecting sleeve 1.3.

[0039] Specifically, the inner core 7 is connected to the inner wall of the cylinder 1.1 by a thread; the plug 11 is connected to the inner wall of the connecting sleeve 1.3 by a thread, and a boss is provided at the upper end of the plug 11. The boss is inserted into the inner core 7 to close the lower end of the inner core 7.

[0040] Specifically, the connecting sleeve 1.3 is radially provided with a first pin hole 6.1, and the inner core 7 is provided with a second pin hole 6.2 on the convex ring 7.1 corresponding to the first pin hole 6.1. Pins 6 are inserted into the first pin hole 6.1 and the second pin hole 6.2 to strengthen the connection.

[0041] Specifically, the guide sleeve 1.2 has an outer dispersion port 3 at one end near the connecting sleeve 1.3, and the inner core 7 has an inner dispersion port 8 corresponding to the outer dispersion port 3. The outer dispersion port 3 and the inner dispersion port 8 together form a dispersion port.

[0042] Specifically, at least two dispersion ports are evenly arranged around the dispersion device, the outer dispersion ports 3 are evenly distributed around the guide sleeve 1.2, and the inner dispersion ports 8 are evenly distributed around the inner core 7.

[0043] Specifically, the outer dispersion port 3 and the inner dispersion port 8 are correspondingly rectangular. The upper end face of the protrusion of the plug 11 is flush with the lower edge of the inner dispersion port 8. The steps on the outer periphery of the protrusion are used for positioning, so that the agent can be fully released and no sediment residue will occur.

[0044] The cylinder 1.1, inner core 7, and plug 11 together constitute the reagent cavity, and the reagent is filled in the reagent cavity.

[0045] Furthermore, the hydraulically driven gate includes a hydraulic chamber spring 4 and a baffle plate 5. The baffle plate 5 is annular and is arranged in a ring between the guide sleeve 1.2 and the inner core 7. The baffle plate 5 and the inner transition step 1.4 form a hydraulic chamber. The guide sleeve 1.2 is provided with a hydraulic control port 2 communicating with the hydraulic chamber. The hydraulic chamber spring 4 is arranged between the baffle plate 5 and the inner transition step 1.4.

[0046] Specifically, the convex ring 7.1 of the guide sleeve 1.2 serves as the lower positioning of the baffle plate 5.

[0047] Specifically, the hydraulic chamber spring 4 is a large spring sleeved on the outer wall of the inner core 7, such as... Figure 6 As shown, or at least three small springs evenly distributed around the inner core, such as Figure 1 As shown, the upper end of the small spring is spot-welded to the inner transition step 1.4 using an inner hole welding gun, and the lower end of the small spring is spot-welded to the end face of the baffle plate 5 using an inner hole welding gun.

[0048] Specifically, the hydraulic control port 2 is located near the cylinder 1.1, and the hydraulic control port 2 is used to connect hydraulic lines.

[0049] Hydraulic oil is injected into the hydraulic chamber through the hydraulic control port 2. The hydraulic oil pushes the baffle plate 5 to the bottom of the hydraulic chamber. The baffle plate 5 is located between the outer dispersion port 3 and the inner dispersion port 8, blocking the contact between the corrosion inhibitor and the external fluid. The dispersion device is in the closed state. In this state, the hydraulic chamber spring 4 is in the stretched state.

[0050] When the hydraulic oil is extracted, the baffle plate 5 moves upward into the hydraulic chamber under the action of the hydraulic chamber spring 4, and the dispersing device is in the open state. The size of the opening in the dispersing state depends on the amount of hydraulic oil in the hydraulic chamber.

[0051] Furthermore, the self-applying mechanism includes a medicine chamber spring 9 and an amplifying plate 10. The upper end of the medicine chamber spring 9 is connected to the inner end face of the cylinder 1.1, and the lower end of the medicine chamber spring 9 is connected to the amplifying plate 10. The outer wall of the amplifying plate 10 is clearance-fitted with the inner wall of the inner core 7. After the dispersion port is opened, the medicine chamber spring 9 presses down the amplifying plate 10, causing the medicine to be released from the dispersion port.

[0052] After the corrosion inhibitor is filled into the reagent chamber, it causes the force plate 10 to move upward to the top of the reagent chamber, and the reagent chamber spring 9 is in a compressed state. When the corrosion inhibitor dissolves, the reagent chamber spring 9 pushes the corrosion inhibitor downward through the force plate 10, keeping the corrosion inhibitor in the lower position of the reagent chamber, ensuring that the corrosion inhibitor can always be in contact with the external fluid through the annular outer dispersion port 3 and the annular inner dispersion port 8.

[0053] Specifically, the outer diameter of the medicine cavity spring 9 is the same as the inner diameter of the inner core 7, such as... Figure 1 As shown, it can be placed directly, or the outer diameter of the medicine chamber spring 9 is smaller than the inner diameter of the inner core 7. A spring seat is set at the center of the cylinder 1.1 and the force plate 10 to restrict the position of the medicine chamber spring 9, as shown. Figure 6 As shown.

[0054] All components not discussed in detail in this application, as well as the connection methods of these components, are well-known technologies in this field. They can be directly applied and will not be elaborated further.

[0055] In this utility model, the term "multiple" refers to two or more unless otherwise explicitly defined. The terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, "connection" can be a fixed connection, a detachable connection, or an integral connection; "linking" can be a direct connection or an indirect connection through an intermediate medium. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0056] In the description of this utility model, it should be understood that the terms "upper", "lower", "left", "right", "front", "rear", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or unit referred to must have a specific orientation or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0057] In the description of this specification, the terms "one embodiment," "some embodiments," "specific embodiment," etc., refer to a specific feature, structure, material, or characteristic described in connection with that embodiment or example, which is included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0058] The above description is merely a preferred embodiment of this utility model and is not intended to limit the utility model. Various modifications and variations can be made to this utility model by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this utility model should be included within the protection scope of this utility model.

Claims

1. A switchable downhole corrosion inhibitor dispersion device, comprising a housing, characterized in that, It also includes an inner core; the outer shell includes a cylindrical body, a guide sleeve, and a connecting sleeve connected in sequence, with an inner transition step formed between the cylindrical body and the guide sleeve; The inner core is connected to the inner wall of the cylinder, the lower end of the inner core is closed, the inner core and the guide sleeve are provided with radially penetrating dispersion ports, and a liquid-driven gate is provided in the annular space between the inner core and the guide sleeve to control the opening and closing of the dispersion ports; The inner core is used to fill the agent, and the inner end face of the cylinder is provided with a self-applying force mechanism to press the corrosion inhibitor inside the inner core outward.

2. The switch-controllable downhole corrosion inhibitor dispersion device according to claim 1, characterized in that, The hydraulically driven gate includes a hydraulic chamber spring and a baffle plate; The baffle plate is annular and is arranged in a ring between the guide sleeve and the inner core. The baffle plate and the inner transition step form a hydraulic cavity. The guide sleeve is provided with a hydraulic control port communicating with the hydraulic cavity. A hydraulic cavity spring is provided between the baffle plate and the inner transition step.

3. The switch-controllable downhole corrosion inhibitor dispersion device according to claim 1, characterized in that, The self-applying mechanism includes a medicine chamber spring and an applying plate; The spring in the drug chamber is disposed between the force-adding plate and the inner end face of the cylinder, and the outer wall of the force-adding plate is fitted with the inner wall of the inner core with a clearance.

4. The switch-controllable downhole corrosion inhibitor dispersion device according to claim 1, characterized in that, The connecting sleeve connects to the plug, and the upper end of the plug is provided with a boss. The boss is inserted into the inner core and closes the lower end of the inner core.

5. A switch-controllable downhole corrosion inhibitor dispersion device according to claim 2, characterized in that, A convex ring is provided on the lower outer wall of the guide sleeve. The outer wall of the convex ring is in clearance fit with the connecting sleeve. The convex ring serves as a lower positioning element for the baffle plate.

6. The switch-controllable downhole corrosion inhibitor dispersion device according to claim 5, characterized in that, The connecting sleeve is radially provided with a first pin hole, and the inner core is provided with a second pin hole on the convex ring corresponding to the first pin hole. Pins are inserted into the first pin hole and the second pin hole to strengthen the connection.

7. A switch-controllable downhole corrosion inhibitor dispersion device according to claim 4, characterized in that, The guide sleeve has an outer dispersion port at one end near the connecting sleeve, and the inner core has an inner dispersion port corresponding to the outer dispersion port. The outer dispersion port and the inner dispersion port together form a dispersion port. At least two dispersion ports are evenly arranged around the dispersion device.

8. A switch-controllable downhole corrosion inhibitor dispersion device according to claim 7, characterized in that, The outer and inner dispersion ports are rectangular in shape, and the upper surface of the plug protrusion is flush with the lower edge of the inner dispersion port.

9. A switch-controllable downhole corrosion inhibitor dispersion device according to claim 2, characterized in that, The hydraulic chamber spring is a large spring sleeved on the outer wall of the inner core, or at least three small springs evenly distributed along the circumference of the inner core.

10. A switch-controllable downhole corrosion inhibitor dispersion device according to claim 3, characterized in that, The outer diameter of the spring in the drug cavity is the same as the inner diameter of the inner core, or the outer diameter of the spring in the drug cavity is smaller than the inner diameter of the inner core. A spring seat is provided at the center of the cylinder and the force plate to restrict the position of the spring in the drug cavity.

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