An acidizing plugging removal profile control device and method for steam injection of oil wells

Abstract

The application discloses an acidification plugging removal and profile control equipment and method for steam injection of oil wells, which comprises a liquid storage tank, further comprises a quantitative liquid outlet mechanism and a rotating stirring mechanism, the quantitative liquid outlet mechanism is installed on the liquid storage tank, the inlet end of the rotating stirring mechanism is communicated with the outlet end of the liquid storage tank, and the rotating stirring mechanism is further in transmission connection with the quantitative liquid outlet mechanism. Through the action between the quantitative liquid outlet mechanism and the rotating stirring mechanism, the acidification liquid is sequentially and gradually discharged, the discharge of the acidification liquid is saved, the acidification liquid is simply stirred through the rotating action of the rotating blade, the acidification liquid mixing is improved, the acidification liquid plugging removal effect is improved, the arc-shaped wiping plate is driven to wipe the inner wall of the liquid spraying pipe through the rotation of the horizontal rod, and the waste of the acidification liquid is reduced.

Description

Technical Field

[0001] This invention relates to the field of oil well profile control technology, specifically to an acidizing and deblocking profile control device and method for steam injection in oil wells. Background Technology

[0002] To extract oil, wells are the holes drilled according to the well layout system in the oilfield development plan. They are the channels through which oil rises from the bottom of the well to the wellhead. Oil wells are holes drilled using drilling methods. Generally, after drilling to the oil layer, oil layer casing is run in, and oil well cement is injected into the annular space between the casing and the well wall to maintain the well wall and seal the oil, gas, and water layers. Then, according to the requirements of oilfield development, the oil layer is perforated with a perforating gun to form a channel, and tubing is run in. Using appropriate flow induction methods, oil rises from the bottom of the oil well to the wellhead.

[0003] Heavy oil development mainly employs steam injection technology, and steam injection pressure is a crucial factor affecting the quality of steam injection in oil wells. High-pressure wells have low steam temperatures at the bottom of the well, resulting in low enthalpy injected and a short effective period of steam injection after well opening. In severe cases, the boiler may be shut down due to high pressure, failing to achieve the designed steam injection volume. Because the formation is a sensitive heavy oil reservoir with generally high mud content, poor reservoir properties, and ash interlayers, it is necessary to pre-treat the oil wells with acidizing and profile control agents to reduce steam injection pressure, expand the reach of hot steam, improve heat utilization, and prevent the backflow of acidizing residues generated from multiple well runs, thereby achieving the effect of reservoir modification.

[0004] Existing methods involve adding acidifying agents to the oil layer to neutralize the acidic film and thus unblock the blockage. However, when adding acidifying agents, they are usually added directly through pipelines. Direct addition cannot fully mix the acidifying solution, reducing the unblocking effect of the added acidifying agent and failing to better neutralize the acidic film on the oil layer, thereby reducing the subsequent steam injection effect. Therefore, an acidizing, unblocking, and profile control device for steam injection in oil wells is proposed.

[0005] Publication (Announcement) No.: CN109138923A, Publication (Announcement) Date: 2019-01-04 discloses a deep profile control and displacement device and process for oily sludge. The device includes an oily sludge tank, a clear water tank, and a mixing tank. An agitator is installed in the mixing tank. A sludge pump is installed in the oily sludge tank, and the outlet of the sludge pump is connected to the sludge inlet of the mixing tank via a sludge pipeline. The clear water tank is connected to the mixing tank via a pipeline. A high-pressure pump is also installed in the mixing tank, and the output port of the high-pressure pump is connected to the injection port of a water injection well via a pipeline. A first flow meter is installed on the pipeline between the oily sludge tank and the mixing tank. A second flow meter and a pressure gauge are respectively installed on the pipeline between the high-pressure pump and the water injection well. A chemical injection port for injecting chemicals into the mixing tank is provided. This device effectively solves the problems of unidirectional water injection, low sweep efficiency, and uneven benefit to oil wells, thereby increasing oil well production and reducing the rate of increase in oilfield water cut.

[0006] Publication (Announcement) No.: CN112523737A, Publication (Announcement) Date: 2021-03-19 discloses an oil well acidizing process and device for improving oil and gas well production. The oil well acidizing device includes an acid tank, a stirring tank inside the acid tank, a stirring device inside the stirring tank, an acidizing string extending from the wellhead device to the bottom of the casing, a nozzle at the bottom of the string, pulse boosting devices on both sides of the acidizing string above the nozzle, and a waste liquid tank connected to the outlet of the wellhead device. The acidizing process includes the following steps: S1 acidizing pretreatment, S2 injection of pre-acid, S3 injection of reactive acid, and S4 injection of neutralizing agent. The acid is injected through pulse boosting, so that the acid enters the oil layer in a wave-like manner, expanding the sweep area and effectively enhancing the injection effect of the acid. The residual acid is neutralized in stages at the bottom of the well, reducing the acid content in the flowback fluid. Furthermore, the components of the pre-acid, reactive acid, and neutralizing agent are optimized to effectively solve the problem of oil layer blockage and achieve the purpose of increasing production.

[0007] Publication (Announcement) No.: CN212803169U, Publication (Announcement) Date: 2021-03-26 discloses an auxiliary device for acidizing and unclogging oil and water wells, including a main body, a fixing mechanism, a sealing mechanism, a conveying mechanism, a conveying box, a connecting pipe, a conveying pipe, a spraying mechanism, a rotating rod, a protective block, a turntable, a through groove, a DC motor, a first gear, a second gear, a connecting end, a descaling mechanism, a crossbar, and cleaning blocks. The conveying pipe is gradually placed inside the oil well. The hydrochloric acid solution inside the main body enters the conveying box through the connecting pipe, and then enters the turntable. At this time, the DC motor rotates, driving the first gear to rotate, which in turn drives the turntable to rotate. This causes the hydrochloric acid solution to be subjected to centrifugal force and thrown out through multiple through grooves, thus facilitating the uniform spraying of the hydrochloric acid solution onto the inner wall of the oil well. Simultaneously, as the turntable rotates, the two cleaning blocks rotate simultaneously, facilitating the mechanical scraping of oil stains from the inner wall of the oil well, further improving the unclogging effect.

[0008] The technical solutions, technical problems to be solved, and beneficial effects of the above-disclosed technologies are different from those of the present invention, or they are in different technical fields or application scenarios. The above-disclosed technical documents do not provide any technical inspiration for the more technical features, technical problems to be solved, and beneficial effects of the present invention. Summary of the Invention

[0009] To address the aforementioned deficiencies in existing technologies, the present invention aims to provide an acidizing and profile control device and method for oil well steam injection. Through the interaction between a metering liquid dispensing mechanism and a rotating stirring mechanism, the acidizing liquid is gradually discharged, saving on the amount of acidizing liquid discharged. Simultaneously, the rotation of the rotating blades provides simple stirring of the discharged acidizing liquid, improving mixing and enhancing the acidizing liquid's unblocking effect. Furthermore, the rotation of the crossbar drives an arc-shaped wiping plate to clean the inner wall of the injection pipe, reducing the waste of acidizing liquid.

[0010] To achieve the above objectives, the present invention adopts the following technical solution:

[0011] A gas injection acidizing and profile control device for oil wells, including a storage tank;

[0012] It also includes a quantitative liquid dispensing mechanism and a rotary stirring mechanism;

[0013] The quantitative dispensing mechanism is installed on the storage tank, and the inlet of the rotating stirring mechanism is connected to the outlet of the storage tank.

[0014] The rotating stirring mechanism is also connected to the quantitative liquid dispensing mechanism in a transmission manner.

[0015] Furthermore, the quantitative liquid dispensing mechanism includes a rotating shaft, a first geared disc, an inlet rotating impeller, a first transmission shaft, a first gear block, and an outlet rotating impeller;

[0016] The inlet end of the liquid storage tank is connected to a water inlet pipe, the inlet end rotating impeller is installed inside the water inlet pipe, and the outlet end rotating impeller is installed at the outlet end of the liquid storage tank;

[0017] The front end of the rotating shaft extends into the water inlet pipe, and the inlet-end rotating impeller is mounted on the front end of the rotating shaft.

[0018] The outlet rotating impeller is mounted at the lower end of the first transmission shaft, the first tooth block is mounted at the upper end of the first transmission shaft, and the first toothed disc is mounted on the rotating shaft, with the first toothed disc meshing with the first tooth block.

[0019] Furthermore, a water pump is installed at the water inlet port of the water inlet pipe.

[0020] Furthermore, the outlet rotating impeller is composed of a cylindrical sleeve and rotating blades on the outer wall of the cylindrical sleeve.

[0021] Furthermore, the rotating stirring mechanism includes a second drive shaft, a second toothed block, a liquid flow plate, a liquid spray pipe, and a liquid spray plate;

[0022] The upper end of the spray pipe is connected to the end of the flow plate, the beginning of the flow plate is connected to the outlet of the storage tank, the lower end of the spray pipe is connected to the central inlet of the spray shell, and the bottom surface of the spray shell is a spray plate with spray holes.

[0023] The second drive shaft passes through the spray pipe and has a diameter smaller than the inner diameter of the spray pipe. The lower end of the second drive shaft is fixedly connected to the center of the spray plate. The second tooth block is installed on the upper end of the second drive shaft. The rotating shaft is also equipped with a second toothed disc, which meshes with the second tooth block.

[0024] Furthermore, an L-shaped wiping plate is installed on the lower end face of the spray plate.

[0025] Furthermore, the flow plate is inclined, that is, the beginning of the flow plate is higher than the end of the flow plate.

[0026] Furthermore, a stirring fan mechanism is installed on the second drive shaft inside the spray pipe.

[0027] Furthermore, the stirring fan mechanism includes a rotating sleeve, stirring blades, and a stirring fan;

[0028] The rotating sleeve is mounted on the second drive shaft, and stirring blades and / or stirring fans are installed on the outer circumferential wall of the rotating sleeve.

[0029] Furthermore, the stirring blade has axially penetrating filter holes.

[0030] Furthermore, a crossbar is connected to the outer shaft end of the stirring fan, and the crossbar is connected and fixed to the arc-shaped wiping plate. The outer arc surface of the arc-shaped wiping plate is frictionally connected to the inner wall of the spray pipe.

[0031] To achieve the above objectives, the present invention adopts the following technical solution:

[0032] A method for using an acidizing and profile control device for steam injection in oil wells includes the following steps:

[0033] First, the flow plate is installed at the outlet of the storage tank, extending the spray pipe into the well. Then, the water pump is turned on, allowing the acidizing fluid to enter the storage tank through the inlet pipe. As the acidizing fluid enters the inlet pipe, the water flow impact drives the first impeller to rotate. This rotation of the first impeller drives the rotating shaft, which in turn drives the first drive shaft to rotate. The engagement between the first toothed disc and the first toothed block drives the first drive shaft to rotate. This, in turn, utilizes the engagement between the second impeller (cylindrical sleeve) and the rotating blade to allow the acidizing fluid in the storage tank to gradually flow into the flow plate, then into the spray pipe, and finally spray onto the oil layer through the spray holes on the spray plate. This gradual outflow of acidizing fluid saves on outflow, while the rotation of the blades provides simple agitation, improving mixing and enhancing the unblocking effect.

[0034] When the rotating shaft rotates, the engagement between the second gear disc and the second gear block drives the second transmission shaft to rotate. The rotation of the second transmission shaft, in turn, drives the rotating sleeve to rotate, which in turn drives the stirring blades to stir and the arc-shaped wiping plate to wipe the inner wall of the spray pipe. The rotation of the second transmission shaft also drives the spray plate to rotate, which in turn drives the L-shaped wiping plate to stir, ensuring the acidifying solution reacts fully on the oil layer. Furthermore, the impact of the water flow causes the stirring fan to rotate. The rotation of the stirring blades and the stirring fan further enhances the thorough mixing of the acidifying solution and improves its unblocking effect on the oil layer.

[0035] Compared with the prior art, the present invention has the following advantages:

[0036] This invention utilizes a quantitative dispensing mechanism. When the acidified liquid is drawn into the storage tank through the inlet pipe by a water pump, the water flow impact drives the rotating impeller to rotate, which in turn drives the rotating shaft to rotate. As the rotating shaft rotates, the cooperation between the first toothed disc and the first toothed block drives the first transmission shaft, the cylindrical sleeve, and the rotating blade to rotate. Through the rotation of the rotating blade, the acidified liquid in the storage tank flows out gradually. This gradual outflow of acidified liquid saves on waste, while the rotation of the rotating blade provides simple stirring to the outflowing acidified liquid, improving mixing and enhancing the unblocking effect.

[0037] This invention utilizes a rotating stirring mechanism. When the rotating shaft rotates, the second toothed disc and the second toothed block drive the second transmission shaft to rotate. The rotation of the second transmission shaft, in turn, drives the spray plate, rotating sleeve, stirring blades, and crossbar to rotate. The rotation of the spray plate causes the L-shaped wiping plate to stir and wipe the oil layer, ensuring a thorough reaction between the acidified liquid and the acidic film on the oil layer. This arrangement, through the rotation of the stirring blades and stirring fan, further enhances the thorough mixing of the acidified liquid, improves the unblocking effect of the oil layer, and facilitates subsequent steam injection. The rotation of the crossbar drives the arc-shaped wiping plate to wipe the inner wall of the spray pipe, reducing the waste of acidified liquid. Attached Figure Description

[0038] Figure 1 This is a schematic diagram of the structure of an acidizing, unblocking, and profile control device for steam injection in oil wells proposed in this invention.

[0039] Figure 2 This is a cross-sectional structural diagram of an acidizing and deblocking profile control device for steam injection in oil wells proposed in this invention.

[0040] Figure 3 This is a top sectional view of an acidizing and deblocking profile control device for steam injection in oil wells proposed in this invention.

[0041] Figure 4 This is a cross-sectional view of the injection pipe and injection plate of an acidizing and deblocking profile control device for oil well steam injection proposed in this invention.

[0042] Figure 5 for Figure 2 Enlarged view of point A;

[0043] Figure 6 for Figure 4 Enlarged view of point B.

[0044] In the diagram: 1. Surface, 2. Oil well, 3. Oil layer, 4. Storage tank, 5. Inlet pipe, 501. Rotating shaft, 502. Rotating impeller, 503. First drive shaft, 504. Cylindrical sleeve, 505. Rotating blade, 6. Water pump, 7. Second drive shaft, 701. Flow plate, 702. Square flange, 703. Spray pipe, 704. Spray plate, 705. L-shaped wiping plate, 706. Rotating sleeve, 707. Stirring blade, 708. Stirring fan, 709. Crossbar, 7010. Arc-shaped wiping plate. Detailed Implementation

[0045] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0046] Example 1:

[0047] Please see Figures 1 to 6 The present invention provides a technical solution:

[0048] A gas injection acidizing and profile control device for oil wells includes a storage tank; it also includes a metering liquid dispensing mechanism and a rotary stirring mechanism; the metering liquid dispensing mechanism is installed on the storage tank, and the inlet end of the rotary stirring mechanism is connected to the outlet end of the storage tank; the rotary stirring mechanism is also drivenly connected to the metering liquid dispensing mechanism. An oil well 2 is located on the surface 1, and an oil layer 3 is formed inside the oil well 2. A storage tank 4 is fixedly connected to the top of the surface 1 on one side of the oil well 2. An inlet pipe 5 is fixedly connected to the top of the storage tank 4, and a water outlet is provided at the bottom of the inlet pipe 5. The inlet pipe 5 communicates with the interior of the storage tank 4 through the water outlet. A water pump 6 is fixedly connected to the side of the inlet pipe 5 away from the storage tank 4.

[0049] like Figure 1 , Figure 2 , Figure 3 , Figure 5 As shown, a metering dispensing mechanism for metering acidified liquid is located on one side of the storage tank 4. The metering dispensing mechanism includes a rotating shaft 501. A rotating hole is provided on the inlet pipe 5. The rotating shaft 501 is rotatably connected to the inlet pipe 5 through the rotating hole. The rotating shaft 501 extends to the outside of the inlet pipe 5 through the rotating hole. A first rotating impeller 502 is fixedly connected to the outer wall of the rotating shaft 501. A first gear disk and a second gear disk are fixedly connected to the outer wall of the rotating shaft 501. A water inlet is provided on one side of the storage tank 4. A first drive shaft 503 is rotatably connected to one side of the storage tank 4. A rotating groove is provided on one side of the storage tank 4. The first drive shaft 503 extends to the outside of the storage tank 4 through the rotating groove. The first drive shaft 503 is rotatably connected to the storage tank 4 through the rotating groove. A first tooth block is fixedly connected to one end of the first drive shaft 503. The first drive shaft 503 extends to the outside of the storage tank 4. A cylindrical sleeve 504 is fixedly connected to the outer wall of the first drive shaft 503. The cylindrical sleeve 504 is located inside the water inlet. Multiple rotating blades 505 are fixedly connected to the outer wall of the cylindrical sleeve 504. The rotating blades 505 are arc-shaped.

[0050] When the acidifying liquid is drawn into the storage tank 4 through the inlet pipe 5 by the water pump 6, the first rotating impeller 502 is driven to rotate by the water flow impact, which in turn drives the rotating shaft 501 to rotate. When the rotating shaft 501 rotates, the first transmission shaft 503, the cylindrical sleeve 504 and the rotating blade 505 are driven to rotate by the cooperation between the first toothed disc and the first toothed block. Through the rotation of the rotating blade 505, the acidifying liquid in the storage tank 4 flows out gradually. With this setting, the acidifying liquid is discharged gradually, saving the amount of acidifying liquid discharged. At the same time, the rotation of the rotating blade 505 is used to simply stir the discharged acidifying liquid, improve the mixing of the acidifying liquid, and increase the unblocking effect of the acidifying liquid.

[0051] like Figure 1 , Figure 2 , Figure 4 , Figure 6 As shown, a rotating stirring mechanism for stirring the acidizing fluid is located inside the oil well 2. The rotating stirring mechanism includes a second drive shaft 7, one end of which is fixedly connected to a second toothed block. A square flange 702 is fixedly connected to one side of the storage tank 4, and the square flange 702 is bolted to the side of the storage tank 4. A flow plate 701 is fixedly connected to the side of the square flange 702 away from the storage tank 4. The flow plate 701 is inclined, and a spray pipe 703 is fixedly connected to the bottom of the flow plate 701. A water inlet is provided at the bottom of the flow plate 701, and the flow plate 701 communicates with the interior of the spray pipe 703 through the water inlet. The inclined arrangement of the flow plate 701 increases the speed at which the acidizing fluid flows into the spray pipe 703 and increases the speed at which the acidizing fluid flows out. A spray plate 704 is rotatably connected to the end of the spray pipe 703 away from the flow plate 701. A spray hole is provided at the bottom of the spray plate 704, and a spray nozzle is provided at the top of the spray plate 704. A rotating port connects the spray plate 704 to the spray pipe 703. The interior of the spray pipe 703 is connected to the interior of the spray plate 704. A second drive shaft 7 extends into the interiors of the spray plate 701, the spray pipe 703, and the spray plate 704. A rotating sleeve 706 is fixedly connected to the outer wall of the second drive shaft 7. The rotating sleeve 706 is located inside the spray pipe 703. A crossbar 709 and a stirring blade 707 are fixedly connected to both sides of the rotating sleeve 706, respectively. A filter hole is provided on the 707. The filter hole on the stirring blade 707 reduces the time that the acidified liquid stays on the stirring blade 707, thus reducing the waste of the acidified liquid. An arc-shaped wiping plate 7010 is fixedly connected to the end of the crossbar 709 away from the rotating sleeve 706. The arc-shaped wiping plate 7010 is slidably fitted to the inner wall of the spray pipe 703. An stirring fan 708 is fixedly connected to the outer wall of the crossbar 709. L-shaped wiping plates 705 are fixedly connected to both sides of the spray plate 704.

[0052] When the rotating shaft 501 rotates, the second transmission shaft 7 is driven to rotate through the action of the second toothed disc and the second toothed block. When the second transmission shaft 7 rotates, it drives the spray plate 704, the rotating sleeve 706, the stirring blade 707 and the crossbar 709 to rotate. When the spray plate 704 rotates, it drives the L-shaped wiping plate 705 to stir and wipe the oil layer 3, so that the acidification liquid reacts fully with the acidic film on the oil layer 3. Through this setting, the rotation of the stirring blade 707 and the stirring fan 708 further improves the full mixing of the acidification liquid and enhances the unblocking effect of the acidification liquid on the oil layer 3, which facilitates the subsequent steam injection effect. The rotation of the crossbar 709 drives the arc-shaped wiping plate 7010 to wipe the inner wall of the spray pipe 703, reducing the waste of acidification liquid.

[0053] like Figure 1-6 As shown, the functional principle of this invention can be explained through the following operational methods:

[0054] First, the flow plate 701 is installed on one side of the storage tank 4 via the square flange 702, allowing the spray pipe 703 to extend into the oil well 2. At this time, the water pump 6 is turned on, allowing the acidizing fluid to enter the storage tank 4 through the inlet pipe 5. When the acidizing fluid enters the inlet pipe 5, the water flow impact drives the first rotating impeller 502 to rotate. The rotation of the first rotating impeller 502 drives the rotating shaft 501 to rotate, and the engagement between the first gear disc and the first gear block drives the first drive shaft 503 to rotate. The acidifying liquid in the storage tank 4 gradually flows into the flow plate 701 through the cooperation between the cylindrical sleeve 504 and the rotating blade 505, and then into the spray pipe 703. Finally, it is sprayed onto the oil layer 3 through the spray holes on the spray plate 704. It should be noted that with this setting, the acidifying liquid is discharged gradually, saving the amount of acidifying liquid discharged. At the same time, the rotation of the rotating blade 505 is used to simply stir the discharged acidifying liquid, which improves the mixing of the acidifying liquid and increases the unblocking effect of the acidifying liquid.

[0055] When the rotating shaft 501 rotates, the second transmission shaft 7 is driven to rotate by the cooperation between the second toothed disc and the second toothed block. When the second transmission shaft 7 rotates, the rotating sleeve 706 rotates. When the rotating sleeve 706 rotates, the stirring blade 707 stirs and the arc-shaped wiping plate 7010 wipes the inner wall of the spray pipe 703. When the spray plate 704 rotates, it drives the L-shaped wiping plate 705 to stir, so that the acidifying liquid can react fully on the oil layer 3. Then, the water flow impact causes the stirring fan 708 to rotate. It should be noted that, through this setting, the rotation of the stirring blade 707 and the stirring fan 708 further improves the full mixing of the acidifying liquid and enhances the unblocking effect of the acidifying liquid on the oil layer 3, which facilitates the subsequent steam injection effect.

[0056] Example 2:

[0057] Please see Figures 1 to 6 The present invention provides a technical solution:

[0058] A gas injection acidizing and profile control device for oil wells, including a storage tank;

[0059] It also includes a quantitative liquid dispensing mechanism and a rotary stirring mechanism;

[0060] The quantitative dispensing mechanism is installed on the storage tank, and the inlet of the rotating stirring mechanism is connected to the outlet of the storage tank.

[0061] The rotating stirring mechanism is also connected to the quantitative liquid dispensing mechanism in a transmission manner.

[0062] Furthermore, the quantitative liquid dispensing mechanism includes a rotating shaft, a first geared disc, an inlet rotating impeller, a first transmission shaft, a first gear block, and an outlet rotating impeller;

[0063] The inlet end of the liquid storage tank is connected to a water inlet pipe, the inlet end rotating impeller is installed inside the water inlet pipe, and the outlet end rotating impeller is installed at the outlet end of the liquid storage tank;

[0064] The front end of the rotating shaft extends into the water inlet pipe, and the inlet-end rotating impeller is mounted on the front end of the rotating shaft.

[0065] The outlet rotating impeller is mounted at the lower end of the first transmission shaft, the first tooth block is mounted at the upper end of the first transmission shaft, and the first toothed disc is mounted on the rotating shaft, with the first toothed disc meshing with the first tooth block.

[0066] Furthermore, a water pump is installed at the water inlet port of the water inlet pipe.

[0067] Furthermore, the outlet rotating impeller is composed of a cylindrical sleeve and rotating blades on the outer wall of the cylindrical sleeve.

[0068] Furthermore, the rotating stirring mechanism includes a second drive shaft, a second toothed block, a liquid flow plate, a liquid spray pipe, and a liquid spray plate;

[0069] The upper end of the spray pipe is connected to the end of the flow plate, the beginning of the flow plate is connected to the outlet of the storage tank, the lower end of the spray pipe is connected to the central inlet of the spray shell, and the bottom surface of the spray shell is a spray plate with spray holes.

[0070] The second drive shaft passes through the spray pipe and has a diameter smaller than the inner diameter of the spray pipe. The lower end of the second drive shaft is fixedly connected to the center of the spray plate. The second tooth block is installed on the upper end of the second drive shaft. The rotating shaft is also equipped with a second toothed disc, which meshes with the second tooth block.

[0071] Furthermore, an L-shaped wiping plate is installed on the lower end face of the spray plate.

[0072] Example 3:

[0073] Please see Figures 1 to 6 The present invention provides a technical solution:

[0074] A gas injection acidizing and profile control device for oil wells, including a storage tank;

[0075] It also includes a quantitative liquid dispensing mechanism and a rotary stirring mechanism;

[0076] The quantitative dispensing mechanism is installed on the storage tank, and the inlet of the rotating stirring mechanism is connected to the outlet of the storage tank.

[0077] The rotating stirring mechanism is also connected to the quantitative liquid dispensing mechanism in a transmission manner.

[0078] Furthermore, the quantitative liquid dispensing mechanism includes a rotating shaft, a first geared disc, an inlet rotating impeller, a first transmission shaft, a first gear block, and an outlet rotating impeller;

[0079] The inlet end of the liquid storage tank is connected to a water inlet pipe, the inlet end rotating impeller is installed inside the water inlet pipe, and the outlet end rotating impeller is installed at the outlet end of the liquid storage tank;

[0080] The front end of the rotating shaft extends into the water inlet pipe, and the inlet-end rotating impeller is mounted on the front end of the rotating shaft.

[0081] The outlet rotating impeller is mounted at the lower end of the first transmission shaft, the first tooth block is mounted at the upper end of the first transmission shaft, and the first toothed disc is mounted on the rotating shaft, with the first toothed disc meshing with the first tooth block.

[0082] Although all the above embodiments use Figures 1 to 6 However, those skilled in the art will clearly understand that separate drawings are not necessary; simply removing missing components or structural features from the drawings is sufficient. This is clear to those skilled in the art. Of course, embodiments with more components are merely optimal embodiments, while embodiments with fewer components are basic embodiments, but both can achieve the basic inventive objective. Therefore, all these modified embodiments are within the protection scope of this invention.

[0083] 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 and will not be elaborated upon further. Examples include welding and threaded connections.

[0084] In this invention, the term "multiple" refers to two or more unless otherwise explicitly defined. The terms "install," "connect," "link," and "fix" should be interpreted broadly. For example, "connect" can be a fixed connection, a detachable connection, or an integral connection; "link" 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 invention according to the specific circumstances.

[0085] In the description of this invention, 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 invention 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 invention.

[0086] 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.

[0087] The above description is merely a preferred embodiment of the present invention and is not intended to limit the invention. Various modifications and variations can be made to the present invention by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the scope of protection of the present invention.

Claims

1. An acidizing plugging removal profile control device for steam injection of oil wells, comprising a liquid storage tank; characterized in that, It also includes a quantitative liquid mechanism, a rotating stirring mechanism; The quantitative liquid mechanism is installed on the liquid storage tank, and the inlet end of the rotating stirring mechanism is communicated with the outlet end of the liquid storage tank; The rotating stirring mechanism is also drivingly connected with the quantitative liquid mechanism; The quantitative liquid mechanism includes a rotating shaft, a first tooth disc, an inlet end rotating impeller, a first transmission shaft, a first tooth block, and an outlet end rotating impeller; The inlet end of the water inlet pipe is connected with the inlet end of the liquid storage tank, the inlet end rotating impeller is installed in the water inlet pipe, and the outlet end rotating impeller is installed at the outlet end of the liquid storage tank; The front end of the rotating shaft extends into the water inlet pipe, and the inlet end rotating impeller is installed at the front end of the rotating shaft; The outlet end rotating impeller is installed at the lower end of the first transmission shaft, the first tooth block is installed at the upper end of the first transmission shaft, and the first tooth disc is installed on the rotating shaft and engaged with the first tooth block; The rotating stirring mechanism includes a second transmission shaft, a second tooth block, a liquid flow plate, a liquid spraying pipe, and a liquid spraying plate; The upper end of the liquid spraying pipe is communicated with the end of the liquid flow plate, the beginning of the liquid flow plate is communicated with the outlet end of the liquid storage tank, the lower end of the liquid spraying pipe is communicated with the central inlet of the liquid spraying shell, and the bottom surface of the liquid spraying shell is a liquid spraying plate with spraying holes; The second transmission shaft passes through the liquid spraying pipe and has a diameter smaller than the inner diameter of the liquid spraying pipe, the lower end of the second transmission shaft is fixedly connected with the center of the liquid flow plate, the second tooth block is installed at the upper end of the second transmission shaft, a second tooth disc is also installed on the rotating shaft, and the second tooth disc is engaged with the second tooth block; An L-shaped wiping plate is installed at the lower end surface of the liquid spraying plate; The liquid flow plate is inclined, i.e., the beginning of the liquid flow plate is higher than the end of the liquid flow plate; A stirring fan mechanism is installed on the second transmission shaft in the liquid spraying pipe; The stirring fan mechanism includes a rotating sleeve, stirring blades, and a stirring fan; The rotating sleeve is sleeved on the second transmission shaft, and the stirring blades and / or the stirring fan are installed on the outer circumferential wall of the rotating sleeve.

2. The acidizing, plugging-removing, and profile-controlling equipment for steam injection of oil wells according to claim 1, characterized in that, A water suction pump is installed at the water inlet port of the water inlet pipe.

3. The acidizing, plugging-removing and profile control equipment for steam injection of oil well according to claim 1 or 2, characterized in that, The outlet end rotating impeller is composed of a cylindrical sleeve and rotating leaves on the outer wall of the cylindrical sleeve.

4. The acidizing, plugging-removing and profile control equipment for steam injection of oil well according to claim 1, characterized in that, The stirring blades are provided with axial through filter holes.

5. The acidizing, plugging-removing and profile control equipment for steam injection of oil well according to claim 1, characterized in that, The outer shaft end of the stirring fan is connected with a cross rod, the cross rod is fixedly connected with an arc-shaped wiping plate, and the outer arc surface of the arc-shaped wiping plate is frictionally connected with the inner wall of the liquid spraying pipe.

6. A method for using the acidizing, plugging removal and profile control equipment for steam injection of oil wells according to any one of claims 1 to 5, characterized in that, The method includes the following steps: First, install the liquid flow plate at the outlet end of the liquid storage tank, extend the liquid spraying pipe into the oil well, turn on the water suction pump, and make the acidizing liquid enter the liquid storage tank through the liquid inlet pipe. When the acidizing liquid enters the liquid inlet pipe, the water flow impact drives the first rotating impeller to rotate, the first rotating impeller drives the rotating shaft to rotate when rotating, the first transmission shaft is driven to rotate by the cooperation between the first tooth disc and the first tooth block, the acidizing liquid in the liquid storage tank is sequentially and gradually flowed into the liquid flow plate by the cooperation between the second rotating impeller (cylindrical sleeve) and the rotating leaves, and then flowed into the liquid spraying pipe. Finally, the acidizing liquid is sprayed onto the oil layer from the spraying holes on the liquid spraying plate, the acidizing liquid is sequentially and gradually flowed out, the flow of the acidizing liquid is saved, the rotating action of the rotating leaves is used to simply stir the flowed-out acidizing liquid, the acidizing liquid mixing is improved, and the acidizing liquid plugging effect is increased. When the rotating shaft rotates, the second transmission shaft is driven to rotate by the cooperation between the second toothed disc and the second toothed block. When the second transmission shaft rotates, the rotating sleeve is driven to rotate, and the rotating sleeve drives the stirring blade to stir and wipe the inner wall of the liquid injection pipe when rotating. When the second transmission shaft rotates, the liquid injection plate is driven to rotate, and the L-shaped wiping plate is driven to stir when the liquid injection plate rotates, so that the acidizing liquid fully reacts on the oil layer. The stirring fan is driven to rotate by the action of water flow impact, and the rotation of the stirring blade and the stirring fan further improves the full mixing of the acidizing liquid and improves the acidizing liquid's effect on the oil layer.

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