A high-pressure water injection device with two rounds of layer exchange without moving the pipe column and a method of using the same

Abstract

This invention discloses a dual-stage high-pressure water injection device with a fixed tubing string and its usage method, relating to the field of downhole tool technology. The water injection device includes an outer cylinder with an upper injection groove and a lower injection groove for the upper water injection layer arranged from top to bottom. An upper sliding sleeve is provided on the inner wall of the outer cylinder at the upper injection groove of the upper water injection layer, covering the upper injection groove of the upper water injection layer, and the upper sliding sleeve is disconnectably connected to the outer cylinder. A conductive and shut-off composite sleeve is provided on the inner wall of the outer cylinder at the lower injection groove of the upper water injection layer. This invention enables layered high-pressure water injection wells with two different pressures or requiring alternating injection layers, and layered pressure-driven water injection wells without the need for on-site operations to change the injection tubing string, achieving two-stage layer-changing water injection by dropping balls at the wellhead.

Description

Technical Field

[0001] This invention relates to the field of downhole tool technology, specifically to a high-pressure water injection device for dual-stage layer replacement with a stationary tubing string and its usage method. Background Technology

[0002] In the development of deep, low-permeability to ultra-low-permeability oil reservoirs, situations often arise where water wells cannot inject water and oil wells cannot produce oil. To solve this problem, high-pressure water injection is often used, and in recent years, pressure-driven water injection technology has been developed, which has a higher injection pressure than high-pressure water injection. When a high-pressure water injection well or a pressure-driven water injection well has two layers (layer A and layer B) with different formation pressures or requiring water injection at different times, it is necessary to inject water into one layer while not injecting water into the other. Currently, the method to switch from water injection into layer A and not water injection into layer B in medium- and low-pressure water injection wells to water injection into layer B and not water injection into layer A is to use a test vehicle, lower a retrieval device into the water injection pipe, retrieve the water distribution cores of both layers, replace them, and then put them into the corresponding water distributors. However, this method cannot be implemented in high-pressure water injection wells. Currently, another method to achieve water injection in one layer of a water injection well while not injecting water in another layer is the upper operation, which requires brine well control and the removal of all the layered water injection tubing. Then, the water injection tubing for the changed layer is lowered. This method requires more equipment, takes longer to operate, and the water injection well needs to be shut down for a long time, resulting in high costs.

[0003] Announcement No. CN113356795B discloses a fracturing sand-control production sleeve and its application. The sleeve includes an outer sleeve cylinder, a production sleeve, and a fracturing sleeve. The outer sleeve cylinder has a series of fracturing channels I and a series of production channels II arranged on it. Sand-control screens are welded to the outside of the production channels I. An upper limit ring and a lower limit ring are arranged inside the outer sleeve cylinder. The fracturing sleeve has a stepped cross-section, with the inner diameter of the upper section being approximately equal to the outer diameter of the lower section of the production sleeve, the inner diameter of the middle section being the same as the inner diameter of the production sleeve, and the lower section being a ball seat I. The upper section has a series of fracturing channels II, which correspond one-to-one with the fracturing channels I on the outer sleeve cylinder during fracturing. The production sleeve also has a stepped cross-section, with a ball seat II in the upper section and a series of production channels II arranged in the middle section, which correspond one-to-one with the production channels I on the outer sleeve cylinder during production. The outer diameter of the lower section is approximately equal to the inner diameter of the upper section of the fracturing sleeve. It has a repeatable switching function, facilitating subsequent layered control or repeated fracturing operations.

[0004] The existing secondary ball-throwing conduction scheme is ball melting, which is different from the present invention.

[0005] Announcement No. CN212272147U discloses a carbon dioxide composite layered injection device, including a layered injection cylinder, a first-stage sliding sleeve and a second-stage sliding sleeve fitted inside the layered injection cylinder, the second-stage sliding sleeve being located above the first-stage sliding sleeve, the second-stage sliding sleeve being able to fix and seal the top end of the axial hole, or set and move down to expose the top end of the axial hole while simultaneously sealing the radial through hole; the device also includes a first-stage sealing ball and a second-stage sealing ball, the first-stage sealing ball being able to seal the first-stage sliding sleeve, and the second-stage sealing ball being able to seal the second-stage sliding sleeve.

[0006] The existing secondary ball-throwing conduction scheme is a bypass fluid, which is similar to the present invention, but the structure is different. The structure of the present invention has a larger flow rate.

[0007] Announcement No. CN201420536Y discloses a well completion sliding sleeve fracturing valve including an upper connector, an upper sliding sleeve, a lower sliding sleeve, and a lower connector. A shear cap is installed on the left end of the space connecting the upper connector and the lower connector to the upper sliding sleeve and the lower sliding sleeve, and is fixed to the upper sliding sleeve with a shear nail. A claw spring is installed on the right end and is fixed to the lower sliding sleeve with a shear nail. Steel ball one and steel ball two are installed on the left end of the upper sliding sleeve and the lower sliding sleeve to increase the oil flow channel, ensure normal fracturing of the upper layer, knock off the upper sliding sleeve, so that the two layers of valves do not interfere with each other during well completion production and do not affect the production of the lower layer.

[0008] The existing secondary ball-passing method involves hitting and losing the ball, which is different from the present invention.

[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 the present invention. Regarding the more technical features, technical problems to be solved, and beneficial effects of the present invention, the above-disclosed technical documents do not provide any technical inspiration. Summary of the Invention

[0010] In view of the above-mentioned defects in the existing technology, the purpose of this invention is to provide a high-pressure water injection device for double-stage layer replacement with a stationary tubing and its usage method.

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

[0012] On one hand, the present invention provides a high-pressure water injection device for dual-stage layer replacement with a stationary tubing column, comprising an outer cylinder, wherein the outer cylinder is provided with an upper water injection layer upper injection groove and an upper water injection layer lower injection groove from top to bottom; an upper sliding sleeve is provided on the inner wall of the outer cylinder at the upper water injection layer upper injection groove, the upper sliding sleeve covers the upper water injection layer upper injection groove, and the upper sliding sleeve is disconnectably connected to the outer cylinder; a conductive and closing composite sleeve is provided on the inner wall of the outer cylinder at the upper water injection layer lower injection groove.

[0013] Furthermore, the conduction-closing composite sleeve includes a closing sleeve and a sliding sleeve;

[0014] Specifically, the closing sleeve wall is provided with an upper connecting groove and a lower connecting groove from top to bottom, and the closing sleeve is connected to the outer cylinder through a ball-throwing unlocking double-sealing mechanism;

[0015] Specifically, the lower connecting groove corresponds to and is connected to the lower injection groove of the upper water injection layer;

[0016] Specifically, the sliding sleeve covers the lower connecting groove, the sliding sleeve is fixedly connected to the closing sleeve by the sliding sleeve pin, and the ball-throwing unlocking two-seal mechanism is located above the sliding sleeve;

[0017] Specifically, the outer cylinder is provided with an enlarged diameter section below the injection tank of the upper water injection layer, and the enlarged diameter section is provided with a liquid overflow support;

[0018] Specifically, when the closing sleeve is seated on the liquid support, the upper connecting groove is connected to the enlarged diameter section, and the closing sleeve covers and seals the lower injection groove of the upper water injection layer;

[0019] Specifically, a baffle is provided on the inner wall of the lower end of the closing sleeve. The inner diameter of the baffle is smaller than the outer diameter of the sliding sleeve, and the distance from the lower end of the sliding sleeve to the baffle is greater than or equal to the distance from the upper end of the sliding sleeve to the lower end of the lower connecting groove.

[0020] Furthermore, the ball-throwing unlocking mechanism includes a middle sliding sleeve and a locking block;

[0021] Specifically, the inner wall of the outer cylinder is provided with an outer locking groove, the sleeve wall of the closing sleeve is provided with a through locking channel, the outer locking groove and the locking channel correspond and overlap, and the locking block is located in the outer locking groove and the locking channel to lock the closing sleeve and the outer cylinder.

[0022] Specifically, the middle sliding sleeve is provided with a release groove, the middle sliding sleeve is fixedly connected to the closing sleeve by a middle sliding sleeve pin, the middle sliding sleeve is located above the lower sliding sleeve, the release groove is located above the locking channel, the radial dimension of the release groove is greater than or equal to the radial dimension of the outer locking groove, and the groove surface of the outer locking groove is a guide surface.

[0023] Furthermore, the upper sliding sleeve is fixedly connected to the outer cylinder by an upper sliding sleeve pin.

[0024] Furthermore, the inner diameter of the sliding sleeve is less than the inner diameter of the closing sleeve, which is less than the inner diameter of the upper sliding sleeve.

[0025] Furthermore, the upper end of the outer cylinder is threadedly connected to an upper connector and sealed by a sealing ring, the liquid-passing support is a lower connector, and the lower end of the outer cylinder is threadedly connected to the lower connector and sealed by a sealing ring;

[0026] Specifically, the inner wall of the lower connector is provided with a flow wall located in the expansion section. The inner diameter of the flow wall of the lower connector is smaller than the outer diameter of the lower end of the closing sleeve. The flow wall is provided with a liquid groove, and there is a flow annulus between the flow wall and the outer cylinder wall.

[0027] Furthermore, the groove surface of the outer locking groove on the outer cylinder is conical, and the end of the locking block near the outer cylinder is conical, so that the conical shape of the outer locking groove on the outer cylinder matches the conical shape of the locking block.

[0028] Furthermore, the axial dimension of the release groove is greater than the axial dimension of the locking block.

[0029] Secondly, the present invention provides a method for using a high-pressure water injection device for dual-stage layer replacement with a stationary tubing string, comprising the following steps:

[0030] A high-pressure water injection device with a fixed tubing string and two-stage layer replacement is installed on the packer between two water injection layers. It is lowered into the water injection well along with the water injection tubing string. After the packer is set, the upper water injection layer is sealed and the lower water injection layer is injected.

[0031] The first pitch and press are performed, the lower water injection layer is sealed, the upper water injection layer is opened, and the upper water injection layer is injected.

[0032] The second pitch and suppression were carried out, the upper water injection layer was closed, the lower water injection layer was opened, and the lower water injection layer was injected.

[0033] The third throw and press are performed, the lower water injection layer is sealed, the upper water injection layer is opened, and the upper water injection layer is injected.

[0034] Specifically, during the first throw and press, a valve ball with a diameter larger than the inner diameter of the sliding sleeve and smaller than the inner diameter of the middle sliding sleeve is inserted. The valve ball sits on the upper port of the sliding sleeve to close the sliding sleeve. After the pressure is applied and the pin of the sliding sleeve is sheared, the sliding sleeve descends to the stop and is limited. The lower connecting groove is opened, the lower water injection layer is closed, the upper water injection layer is opened, and the upper water injection layer is injected.

[0035] Specifically, during the second ball throwing and pressing, a valve ball with a diameter larger than the inner diameter of the middle sliding sleeve but smaller than the inner diameter of the upper sliding sleeve is inserted. The valve ball sits on the upper port of the middle sliding sleeve to close it. Pressing causes the pin of the middle sliding sleeve to break, and the middle sliding sleeve moves downward. The release groove aligns with the locking block, and the locking block disengages from the outer cylinder, causing the closing sleeve to move downward to the lower sliding sleeve. The upper connecting groove connects to the aforementioned diameter expansion section. The upper closing sealing ring is above the lower injection groove of the upper water injection layer, and the lower closing sealing ring is below the lower injection groove of the upper water injection layer. The upper water injection layer is closed, and the lower water injection layer is opened, allowing the lower water injection layer to be injected.

[0036] Specifically, during the third throw and pressurization, a valve ball with a diameter larger than the inner diameter of the upper sliding sleeve is inserted. The valve ball sits on the upper end of the upper sliding sleeve to seal it. Pressurization breaks the pin of the upper sliding sleeve, causing the upper sliding sleeve to move downward. The injection groove on the upper water injection layer opens, the lower water injection layer is closed, and the upper water injection layer is injected.

[0037] Compared with the prior art, the present invention has the following advantages:

[0038] 1. This invention enables layered high-pressure water injection wells with two different pressures or requiring alternating water injection layers, and layered pressure-driven water injection wells without the need for on-site operations to replace the water injection string. Two rounds of layer-changing water injection are achieved by dropping balls at the wellhead.

[0039] 2. This invention adjusts the dimensions of the parts within the tool, and the fit between the parts achieves a three-stage sliding sleeve structure; this invention significantly improves the tool's working efficiency and eliminates the need for ball melting operations. Attached Figure Description

[0040] Figure 1 This is a structural schematic diagram of a high-pressure water injection device for dual-stage layer replacement with a stationary tubing column according to the present invention;

[0041] Figure 2 This is a structural schematic diagram of the enlarged upper part of the present invention;

[0042] Figure 3 This is a schematic diagram of the enlarged lower part of the structure of the present invention.

[0043] In the diagram: 1. Upper connector; 2. Outer cylinder; 2-1. Upper water injection layer upper injection groove; 2-2. Upper water injection layer lower injection groove; 2-3. Expanded diameter section; 3. Upper sliding sleeve upper sealing ring; 4. Upper sliding sleeve lower sealing ring; 5. Upper sliding sleeve; 6. Upper closing sealing ring; 7. Lower closing sealing ring; 8. Closing sleeve; 8-1. Upper connecting groove; 8-2. Lower connecting groove; 9. Middle sliding sleeve upper sealing ring; 10. Middle sliding sleeve; 10-1. Release groove; 10-2. Stop; 11. Middle sliding sleeve pin; 12. Locking block; 13. Middle sliding sleeve lower sealing ring; 14. Outer upper sealing ring; 15. Lower sliding sleeve upper sealing ring; 16. Lower sliding sleeve; 17. Lower sliding sleeve lower sealing ring; 18. Outer lower sealing ring; 19. Lower connector; 20. Upper sliding sleeve pin; 21. Lower sliding sleeve pin. Detailed Implementation

[0044] 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.

[0045] Example 1:

[0046] Please see Figures 1 to 3The present invention provides a high-pressure water injection device for dual-stage layer replacement with a stationary tubing column, comprising an outer cylinder 2, wherein the outer cylinder 2 is provided with an upper water injection layer upper injection groove 2-1 and an upper water injection layer lower injection groove 2-2 from top to bottom; an upper sliding sleeve 5 is provided on the inner wall of the outer cylinder 2 at the upper water injection layer upper injection groove 2-1, the upper sliding sleeve 5 covers the upper water injection layer upper injection groove 2-1, and the upper sliding sleeve 5 is fixedly connected to the outer cylinder 2 by an upper sliding sleeve pin 20; a conductive and closing composite sleeve is provided on the inner wall of the outer cylinder 2 at the upper water injection layer lower injection groove 2-2.

[0047] Further, the conductive and closing composite sleeve includes a closing sleeve 8 and a sliding sleeve 16; the closing sleeve 8 has an upper connecting groove 8-1 and a lower connecting groove 8-2 arranged from top to bottom on its sleeve wall; the closing sleeve 8 is connected to the outer cylinder 2 through a ball-throwing unlocking double-sealing mechanism; the lower connecting groove 8-2 corresponds to and is connected to the lower injection groove 2-2 of the upper water injection layer; the sliding sleeve 16 covers the lower connecting groove 8-2; the sliding sleeve 16 is fixedly connected to the closing sleeve 8 through a sliding sleeve pin 21; the ball-throwing unlocking double-sealing mechanism is located above the sliding sleeve 16; the outer cylinder 2 is in the upper water injection layer... An enlarged diameter section 2-3 is provided below the lower injection tank 2-2. The enlarged diameter section 2-3 is provided with a liquid-passing support. When the closing sleeve 8 sits on the liquid-passing support, the upper connecting groove 8-1 is connected to the enlarged diameter section 2-3. The closing sleeve 8 covers and seals the upper water injection tank 2-2. A baffle 10-2 is provided on the lower inner wall of the closing sleeve 8. The inner diameter of the baffle 10-2 is smaller than the outer diameter of the sliding sleeve 16. The distance from the lower end of the sliding sleeve 16 to the baffle 10-2 is greater than or equal to the distance from the upper end of the sliding sleeve 16 to the lower end of the lower connecting groove 8-2.

[0048] Among them, the expansion section 2-3 is used to open the water injection channel of the lower water injection layer.

[0049] Among them, the stop 10-2 is used in conjunction with the sliding sleeve 16 to complete one sealing of the lower water injection layer.

[0050] Furthermore, the ball-throwing unlocking double-sealing mechanism includes a middle sliding sleeve 10 and a locking block 12. The inner wall of the outer cylinder 2 is provided with an outer locking groove, and the sleeve wall of the closing sleeve 8 is provided with a through locking channel. The outer locking groove corresponds to and coincides with the locking channel. The locking block 12 is located in the outer locking groove and the locking channel, locking the closing sleeve 8 and the outer cylinder 2. The middle sliding sleeve 10 is provided with a release groove 10-1. The middle sliding sleeve 10 is fixedly connected to the closing sleeve 8 through a middle sliding sleeve pin 11. The middle sliding sleeve 10 is located above the lower sliding sleeve 16. The release groove 10-1 is located above the locking channel. The radial dimension of the release groove 10-1 is greater than or equal to the radial dimension of the outer locking groove. The groove surface of the outer locking groove is a guide surface. When the release groove 10-1 coincides with the locking channel, the locking block 12 moves outward under the guidance of the guide surface and the action of gravity, thereby disconnecting the closing sleeve 8 from the outer cylinder 2.

[0051] Specifically, the inner diameter of the sliding sleeve 16 is less than the inner diameter of the closing sleeve 8, which is less than the inner diameter of the upper sliding sleeve 5.

[0052] Furthermore, the upper end of the outer cylinder 2 is threadedly connected to an upper connector 1 and sealed by a sealing ring. The liquid-passing support is a lower connector 19. The lower end of the outer cylinder 2 is threadedly connected to the lower connector 19 and sealed by a sealing ring. The inner wall of the lower connector 19 is provided with a flow wall located in the expansion section 2-3. The inner diameter of the flow wall of the lower connector 19 is smaller than the outer diameter of the lower end of the closing sleeve 8. A liquid-passing groove 19-1 is provided on the flow wall. There is a flow-passing annulus between the flow wall and the cylinder wall of the outer cylinder 2. The liquid-passing groove 19-1 and the flow-passing annulus serve to connect the flow channels to realize the function of injecting the second round of water layer.

[0053] Specifically, the upper sliding sleeve 5 has an upper sealing ring 3 above the upper water injection groove 2-1 on its outer wall, and a lower sealing ring 4 below the upper water injection groove 2-1 on its outer wall. The upper sliding sleeve pin 20 is located between the upper sealing ring 3 and the lower sealing ring 4.

[0054] Specifically, the outer wall of the closing sleeve 8 is provided with an upper closing sealing ring 6 and a lower closing sealing ring 7 above the upper connecting groove 8-1, and the distance between the upper closing sealing ring 6 and the lower closing sealing ring 7 is greater than the lower injection groove 2-2 of the upper water injection layer.

[0055] Specifically, an outer upper sealing ring 14 is provided on the outer wall of the closing sleeve 8 between the lower connecting groove 8-2 and the upper connecting groove 8-1, and an outer lower sealing ring 18 is provided on the outer wall of the closing sleeve 8 below the lower connecting groove 8-2. The locking block is located above the outer upper sealing ring 14.

[0056] Specifically, an upper sealing ring 15 is provided on the outer wall of the lower sliding sleeve 16 above the lower connecting groove 8-2, and a lower sealing ring 17 is provided on the outer wall of the lower sliding sleeve 16 below the lower connecting groove 8-2. The pin 21 of the lower sliding sleeve is located between the upper sealing ring 15 and the lower sealing ring 17.

[0057] Specifically, the outer wall of the middle sliding sleeve 10 is provided with an upper sealing ring 9 and a lower sealing ring 13, and the release groove 10-1 and the middle sliding sleeve pin 11 are located between the upper sealing ring 9 and the lower sealing ring 13.

[0058] Specifically, the upper sealing ring 3 and the lower sealing ring 4 of the upper sliding sleeve are installed in the sealing groove on the outer wall of the upper sliding sleeve 5; the upper closing sealing ring 6, the lower closing sealing ring 7, the outer upper sealing ring 14, and the outer lower sealing ring 18 are installed in the sealing groove on the outer wall of the closing sleeve 8; the upper sealing ring 15 and the lower sealing ring 17 of the lower sliding sleeve are installed in the sealing groove on the outer wall of the lower sliding sleeve 16; and the upper sealing ring 9 and the lower sealing ring 13 of the middle sliding sleeve are installed in the sealing groove on the outer wall of the middle sliding sleeve 10.

[0059] Preferably, the groove surface of the outer locking groove on the outer cylinder 2 is conical, and the end of the locking block 12 near the outer cylinder 2 is conical, and the conical shape of the outer locking groove on the outer cylinder 2 matches the conical shape of the locking block 12.

[0060] Preferably, the axial dimension of the release groove 10-1 is larger than the axial dimension of the locking block 12, so that the locking block 12 can enter the release groove 10-1.

[0061] Preferably, the inner diameter of the lower sliding sleeve 16 is smaller than the inner diameter of the middle sliding sleeve 10, with a difference of 3-6 mm, so that a valve ball with a diameter larger than the inner diameter of the lower sliding sleeve 16 can pass through the upper sliding sleeve 5 and the middle sliding sleeve 10. The inner diameter of the middle sliding sleeve 10 is smaller than the inner diameter of the upper sliding sleeve 5, with a difference of 3-6 mm, so that a valve ball with a diameter larger than the inner diameter of the middle sliding sleeve 10 can pass through the upper sliding sleeve 5.

[0062] Preferably, the installation of the middle sliding sleeve pin 11 requires opening an installation hole on the outer cylinder 2, and the installation hole is sealed after the middle sliding sleeve pin 11 is installed.

[0063] Example 2:

[0064] Based on Example 1, this example provides a method for using a dual-stage high-pressure water injection device with a stationary tubing string, comprising the following steps:

[0065] S1. When the present invention is used in a water injection well that requires two rounds of injection into two water injection layers, the present invention is lowered into the water injection well along with the water injection string and installed on the packer between the two layers. After the packer is set, the upper water injection layer is sealed, and the lower water injection layer can then be injected.

[0066] S2. When it is necessary to close the lower water injection layer and inject the upper water injection layer, insert a valve ball with a diameter greater than that of the lower sliding sleeve 16 and a smaller inner diameter than that of the middle sliding sleeve 10. The inserted valve ball sits on the upper port of the lower sliding sleeve 16 to close the lower sliding sleeve 16. After pressure is applied and the lower sliding sleeve pin 21 is sheared, the lower sliding sleeve 16 descends to the stop 10-2 and is limited. The lower connecting groove 8-2 is opened, the lower water injection layer is closed, and water can be injected only into the upper water injection layer.

[0067] S3. When it is necessary to inject the lower water layer to seal the upper water layer again, insert a valve ball with a diameter greater than that of the middle sliding sleeve 10 and an inner diameter smaller than that of the upper sliding sleeve 5. The inserted valve ball sits on the upper port of the middle sliding sleeve 10 to seal the middle sliding sleeve 10. Pressurize to break the middle sliding sleeve pin 11, and the middle sliding sleeve 10 moves downward. The release groove 10-1 is aligned with the locking block 12, and the locking block 12 can disengage from the outer cylinder 2, allowing the closing sleeve 8 to move downward to the lower sliding sleeve 16. The upper connecting groove 8-1 connects to the expansion section 2-3. The upper closing sealing ring 6 is above the lower injection groove 8-2 of the upper water layer, and the lower closing sealing ring 7 is below the lower injection groove 8-2 of the upper water layer. The upper water layer is closed, and the lower water layer is opened, so that only the lower water layer can be injected without injecting the upper water layer.

[0068] S4. When it is necessary to inject water into the upper water layer to seal the lower water layer, a valve ball with a diameter larger than the inner diameter of the upper sliding sleeve 5 is inserted. The inserted valve ball sits on the upper port of the upper sliding sleeve 5 to seal the upper sliding sleeve 5. Pressure is applied to break the upper sliding sleeve pin 20, and the upper sliding sleeve 5 moves downward. The upper water injection groove 2-1 of the upper water layer is opened, and the lower water layer is closed, so it is possible to inject water only into the upper water layer.

[0069] 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.

[0070] 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.

[0071] 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.

[0072] 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.

[0073] 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. A high-pressure water injection device for dual-stage layer replacement with a stationary tubing column, comprising an outer cylinder, wherein the outer cylinder is provided with an upper water injection layer upper injection groove and an upper water injection layer lower injection groove from top to bottom; Its features are, The inner wall of the outer cylinder is provided with an upper sliding sleeve at the injection groove on the upper water injection layer. The upper sliding sleeve covers the injection groove on the upper water injection layer, and the upper sliding sleeve is disconnected from the outer cylinder. The inner wall of the outer cylinder is provided with a conductive and closing composite sleeve at the injection groove below the upper water injection layer.

2. The high-pressure water injection device for dual-stage layer replacement with a stationary tubing string according to claim 1, characterized in that, The conduction-closing composite sleeve includes a closing sleeve and a sliding sleeve; The closing sleeve wall is provided with an upper connecting groove and a lower connecting groove from top to bottom, and the closing sleeve is connected to the outer cylinder through a ball-throwing unlocking double-sealing mechanism; The lower connecting groove corresponds to and is connected to the lower injection groove of the upper water injection layer; The sliding sleeve covers the lower connecting groove, and the sliding sleeve is fixedly connected to the closing sleeve by the sliding sleeve pin. The ball throwing unlocking two-seal mechanism is located above the sliding sleeve. The outer cylinder is provided with an enlarged diameter section below the injection tank of the upper water injection layer, and the enlarged diameter section is provided with a liquid support component; When the closing sleeve is seated on the liquid support, the upper connecting groove is connected to the enlarged diameter section, and the closing sleeve covers and seals the lower injection groove of the upper water injection layer; The lower inner wall of the closing sleeve is provided with a baffle, the inner diameter of which is smaller than the outer diameter of the sliding sleeve, and the distance from the lower end of the sliding sleeve to the baffle is greater than or equal to the distance from the upper end of the sliding sleeve to the lower end of the lower connecting groove.

3. The high-pressure water injection device for dual-stage layer replacement with a stationary tubing string according to claim 2, characterized in that, The ball-throwing unlocking mechanism includes a middle sliding sleeve and a locking block; The inner wall of the outer cylinder is provided with an outer locking groove, and the sleeve wall of the closing sleeve is provided with a through locking channel. The outer locking groove and the locking channel correspond and overlap. The locking block is located in the outer locking groove and the locking channel to lock the closing sleeve and the outer cylinder. The middle sliding sleeve is provided with a release groove. The middle sliding sleeve is fixedly connected to the closing sleeve by a middle sliding sleeve pin. The middle sliding sleeve is located above the lower sliding sleeve. The release groove is located above the locking channel. The radial dimension of the release groove is greater than or equal to the radial dimension of the outer locking groove. The groove surface of the outer locking groove is a guide surface.

4. The high-pressure water injection device for dual-stage layer replacement with a stationary tubing column according to claim 3, characterized in that, The upper sliding sleeve is fixedly connected to the outer cylinder by an upper sliding sleeve pin.

5. The high-pressure water injection device for dual-stage layer replacement with a stationary tubing column according to claim 4, characterized in that, The inner diameter of the lower sliding sleeve is less than the inner diameter of the closing sleeve, which is less than the inner diameter of the upper sliding sleeve.

6. The high-pressure water injection device for dual-stage layer replacement with a stationary tubing string according to claim 5, characterized in that, The upper end of the outer cylinder is threadedly connected to an upper connector and sealed by a sealing ring. The liquid-passing support is a lower connector. The lower end of the outer cylinder is threadedly connected to the lower connector and sealed by a sealing ring. The inner wall of the lower connector is provided with a flow wall located in the expansion section. The inner diameter of the flow wall of the lower connector is smaller than the outer diameter of the lower end of the closing sleeve. The flow wall is provided with a liquid groove, and there is a flow annulus between the flow wall and the outer cylinder wall.

7. The high-pressure water injection device for dual-stage layer replacement with a stationary tubing string according to claim 3, characterized in that, The outer locking groove on the outer cylinder has a conical surface, and the end of the locking block near the outer cylinder is also conical. The conical shape of the outer locking groove on the outer cylinder matches the conical shape of the locking block.

8. A high-pressure water injection device for dual-stage layer replacement with a stationary tubing column according to claim 3, characterized in that, The axial dimension of the release groove is larger than the axial dimension of the locking block.

9. A method of using a high-pressure water injection device with a fixed tubing string and dual-stage layer replacement, characterized in that, Includes the following steps: A high-pressure water injection device with a fixed tubing string and two-stage layer replacement is installed on the packer between two water injection layers. It is lowered into the water injection well along with the water injection tubing string. After the packer is set, the upper water injection layer is sealed and the lower water injection layer is injected. The first pitch and press are performed, the lower water injection layer is sealed, the upper water injection layer is opened, and the upper water injection layer is injected. The second pitch and suppression were carried out, the upper water injection layer was closed, the lower water injection layer was opened, and the lower water injection layer was injected. The third throw and press are performed, the lower water injection layer is sealed, the upper water injection layer is opened, and the upper water injection layer is injected.

10. The method of using the high-pressure water injection device for double-stage layer replacement with a stationary tubing string according to claim 9, characterized in that, When the ball is thrown and pressed for the first time, a valve ball with a diameter larger than the inner diameter of the sliding sleeve and smaller than the inner diameter of the middle sliding sleeve is inserted. The valve ball sits on the upper port of the sliding sleeve to close the sliding sleeve. After the sliding sleeve pin is cut off, the sliding sleeve moves down to the stop and is limited. The lower connecting groove is opened, the lower water injection layer is closed, the upper water injection layer is opened, and the upper water injection layer is injected. During the second ball throwing and pressing, a valve ball with a diameter larger than the inner diameter of the middle sliding sleeve and smaller than the inner diameter of the upper sliding sleeve is inserted. The valve ball sits on the upper port of the middle sliding sleeve to close it. Pressing causes the pin of the middle sliding sleeve to break, and the middle sliding sleeve moves downward. The release groove aligns with the locking block, and the locking block disengages from the outer cylinder, causing the closing sleeve to move downward to the lower sliding sleeve. The upper connecting groove connects to the aforementioned diameter expansion section. The upper closing sealing ring is above the lower injection groove of the upper water injection layer, and the lower closing sealing ring is below the lower injection groove of the upper water injection layer. The upper water injection layer is closed, and the lower water injection layer is opened, allowing the lower water injection layer to be injected. When the ball is thrown and pressed for the third time, a valve ball with a diameter larger than the inner diameter of the upper sliding sleeve is inserted. The valve ball sits on the upper end of the upper sliding sleeve to close it. Pressurization breaks the pin of the upper sliding sleeve, causing the upper sliding sleeve to move downward. The injection groove on the upper water injection layer opens, the lower water injection layer is closed, and the upper water injection layer is injected.

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