Reverse circulation well cementation tool

Abstract

The invention relates to the field of oil and gas well cementation, in particular to a reverse circulation well cementation tool, and aims to solve the technical problem that a casing is blocked by cement paste in an existing reverse circulation well cementation method. According to the reverse circulation well cementation tool, the two-stage actuating sleeve is arranged in the outer shell, and the two-stage actuating sleeve is matched with the induction module and the actuating assembly, so that whether the outer shell is communicated with the annulus or not can be controlled, smooth reverse circulation well cementation is guaranteed, the advantages of the reverse circulation well cementation technology are fully exerted, and the reverse circulation well cementation efficiency is improved. The reverse circulation channel can be closed when cement paste injection operation is completed, cement paste is prevented from entering the hollow part of the casing pipe in the cement setting waiting process, and therefore the risk during reverse circulation well cementation construction is greatly reduced.

Description

Technical Field

[0001] The invention relates to the field of oil and gas well cementing, and in particular to a reverse circulation cementing tool. Background Art

[0002] Cementing operations play a very important role in the entire well construction cycle. The quality of cementing operations is directly related to whether the oil and gas wells can be produced normally after construction and the length of their production life. Cementing operations include casing lowering and cement slurry injection. Among them, cement slurry injection is the key process after casing lowering. Its purpose is to seal the annular space between the casing and the well wall to isolate the oil, gas and water layers.

[0003] Traditional cementing operations usually refer to injecting cement slurry from the casing and then replacing it into the annulus to achieve the purpose of sealing. This is also the most commonly used cementing method. However, for cementing operations in some special wells and abnormal wells, such as single long open hole sections, low-pressure oil and gas layers, weakly cemented formations, under-compacted formations, large temperature difference wells, small borehole wells, etc., this cementing method has serious cement slurry leakage problems. Although existing plugging measures (such as using various lightweight cement slurry systems to reduce the pressure generated by cement slurry circulation) help reduce the possibility of leakage and incidental problems, the drilling fluid density window of these special wells is usually relatively narrow, resulting in a very limited adjustment range for cement slurry density. Moreover, in some cases, there is a problem of super-slow setting of cement slurry.

[0004] In order to change the above situation, a reverse circulation cementing method is proposed. In this method, cement slurry is directly pumped into the annulus for solidification, while the drilling fluid is displaced from the casing to the surface, minimizing the circulation pressure, which is of great significance to the improvement of cementing quality of the above special wells. However, it should be pointed out here that reverse circulation cementing still faces some challenges and difficulties, which are mainly concentrated in the following two points:

[0005] (1) It is difficult to accurately know when the cement slurry reaches the bottom of the well. Reverse circulation cementing operations cannot use the top rubber plug impact pressure method used in conventional cementing. The time when the cement slurry reaches the bottom of the well can only be estimated based on the pumping volume. This time point cannot be accurately grasped. Therefore, in actual operation, only excessive cement slurry can be circulated to ensure the sealing quality, but this will also cause part of the cement slurry to enter the casing;

[0006] (2) Conventional tools such as float shoes and float collars cannot be used. Due to the lack of a back pressure valve, the cement slurry will enter the hollow of the casing due to the pressure difference between the inside and outside of the casing when waiting to solidify. As a result, after the cementing operation is completed, an excessively long cement slurry plug will be left in the casing. If there is also a cement slurry plug in the casing in the production layer, drilling and plugging operations must be carried out, but this will seriously delay the construction period, and the casing may be damaged during the drilling and plugging process, thereby causing other unnecessary problems. Summary of the invention

[0007] The purpose of the present invention is to provide a reverse circulation cementing tool to solve the technical problem of casing clogging by cement slurry in the existing reverse circulation cementing method.

[0008] In order to solve the above technical problems, the technical solution provided by the present invention is:

[0009] The present invention provides a reverse circulation cementing tool, comprising: an outer shell, a two-stage actuating sleeve, a sensing module and an actuating assembly;

[0010] The outer shell is tubular and is provided with a first through hole along its radial direction and penetrating its side wall;

[0011] The two-stage actuating sleeve is disposed in the outer shell, and comprises an outer sleeve and an inner sleeve, wherein the outer sleeve is slidably matched with the outer shell, and is provided with a second through hole along its radial direction and penetrating its side wall, and the second through hole is communicated with the first through hole, and the inner sleeve is in the outer sleeve in a posture of blocking the second through hole, and is connected to the outer sleeve through a shear pin;

[0012] The sensing module is disposed on the side wall of the outer shell and is located on one side of the first through hole, so as to sense whether there is cement slurry in the outer shell;

[0013] The actuating assembly is disposed on the outer shell and is communicatively connected with the sensing module. The actuating assembly is configured to move the outer sleeve along the axial direction of the outer shell to block the first through hole after receiving sensing information.

[0014] Furthermore, the outer sleeve has an upper end portion, the upper end portion is located between the second through hole and the sensing module, and is enclosed with the inner wall of the outer sleeve to form a fluid-filled cavity;

[0015] In the axial direction of the outer shell, two opposite wall surfaces of the fluid-filled cavity are respectively a surface close to the upper end of the second via hole and a surface of the outer shell away from the second via hole;

[0016] A flow channel is formed in the side wall of the outer shell, the flow channel is located on a side of the fluid filling cavity away from the second via hole, one end of the flow channel is connected to the fluid filling cavity, and the other end extends outside the outer shell;

[0017] The actuating assembly includes a blocking member and an activation component, wherein the blocking member blocks the flow passage, and the activation component is configured to drive the blocking member to release the blocking state after receiving sensing information.

[0018] Furthermore, the outer shell is divided into an upper shell and a lower shell, wherein one end of the upper shell is inserted into the lower shell and is threadedly connected to the lower shell;

[0019] The flow passage is formed in the upper shell, and the first through hole is arranged in the lower shell;

[0020] The upper end portion includes an inserting section and an extruding section, wherein the inserting section is plugged into the upper shell and its outer diameter is smaller than the outer diameter of the extruding section, and the extruding section is integrally formed with the inserting section and is located in the lower shell;

[0021] The end surface of the extrusion section, the outer wall of the plug-in section, the end surface of the upper shell and the inner wall of the lower shell together form the fluid-filled cavity.

[0022] Furthermore, a water filling hole is provided on the side wall of the upper shell, and the water filling hole is communicated with the flow passage;

[0023] A plug is provided at the opening of the water filling hole to block the water filling hole.

[0024] Furthermore, one end of the lower shell away from the upper shell is connected with a float shoe;

[0025] One end of the outer sleeve away from the upper end portion abuts against the float shoe.

[0026] Furthermore, one end of the outer shell is externally threadedly connected to a connecting sleeve, and the outer shell and the inner wall of the connecting sleeve are enclosed to form a fluid release cavity;

[0027] The outer wall of the outer shell in the fluid release chamber is provided with a first recess, and the first recess is communicated with the flow passage;

[0028] The blocking member and the activation assembly are both located in the first recess, wherein the blocking member includes a rupture disk, and the activation assembly includes an activation detonator and a pin push rod, wherein the activation detonator is communicatively connected to the sensing module, and the pin push rod is disposed between the activation detonator and the rupture disk.

[0029] Furthermore, the outer wall of the outer shell is also provided with a second recess;

[0030] The actuating assembly also includes a control module and a power module both located in the second recess, wherein the control module is electrically connected to the power module, the sensing module and the activation detonator, respectively, and the power module is electrically connected to the sensing module and the activation detonator, respectively.

[0031] Furthermore, the sensing module includes a magnetic sensor, and the magnetic sensor is used to sense the change of magnetic permeability in the shell.

[0032] Furthermore, along the axial direction of the outer shell, a plurality of grooves are provided on the outer wall of the outer shell at intervals, and each of the grooves extends along the circumferential direction of the outer shell;

[0033] The groove surface of the groove, the outer wall of the outer shell and the inner wall of the connecting sleeve together form the fluid release chamber.

[0034] Furthermore, the inner sleeve is chamfered near the opening of the sensing module.

[0035] In summary of the above technical solutions, the reverse circulation cementing tool provided by the present invention can achieve the following technical effects:

[0036] The reverse circulation cementing tool comprises an outer shell, a two-stage actuating sleeve, a sensing module and an actuating assembly; the outer shell is tubular and is provided with a first through hole along its radial direction and penetrating its side wall; the two-stage actuating sleeve is arranged in the outer shell, comprising an outer sleeve and an inner sleeve, wherein the outer sleeve is slidably matched with the outer shell, and is provided with a second through hole along its radial direction and penetrating its side wall, and the second through hole is connected with the first through hole, and the inner sleeve is in the outer sleeve in a posture of blocking the second through hole, and is connected to the outer sleeve through a shear pin; the sensing module is arranged on the side wall of the outer shell, and is on one side of the first through hole, so as to sense whether there is cement slurry in the outer shell; the actuating assembly is arranged on the outer shell, and is communicatively connected with the sensing module, and the actuating assembly is configured to move the outer sleeve along the axial direction of the outer shell after receiving the sensing information, so as to block the first through hole.

[0037] In the initial state of the reverse circulation cementing tool, the inner sleeve blocks the second through hole, blocking the communication between the outer shell and the outside world, thereby preventing the fluid from entering the outer shell; after the reverse circulation cementing tool is lowered into place with the casing, a sealing ball is put into the pipe, and the sealing ball falls until it is seated in the inner sleeve. By increasing the pressure, the sealing ball exerts a downward force on the inner sleeve, and the shear pin is subjected to the shear force. As the pressure continues to increase, the shear pin is disconnected, and then the inner sleeve moves downward, thereby releasing the blocking of the second through hole. At this time, the outer shell is connected to the annulus through the second through hole and the first through hole; once the outer shell is connected to the annulus, cement slurry is injected into the annulus, and after the cement slurry rises to the height of the first through hole, it enters the central channel of the outer shell through the first through hole and the second through hole; when the cement slurry rises in the central channel to pass through the sensing module, the sensing module will transmit the corresponding sensing information to the actuating assembly, and at this time the actuating assembly is started to move the outer sleeve along the axial direction of the outer shell, thereby blocking the first through hole, and again blocking the communication between the outer shell and the outside world, so that the cement slurry cannot enter the central channel.

[0038] It can be seen that compared with the existing technology, the reverse circulation cementing tool can ensure the smooth progress of reverse circulation cementing when used with the pipe string, so that the advantages of reverse circulation cementing technology can be fully utilized. The reverse circulation passage can also be closed when the cement slurry injection operation is completed to prevent the cement slurry from entering the casing hollow during the waiting process, thereby greatly reducing the risk during reverse circulation cementing construction. BRIEF DESCRIPTION OF THE DRAWINGS

[0039] In order to more clearly illustrate the specific implementation methods of the present invention or the technical solutions in the prior art, the drawings required for use in the specific implementation methods or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some implementation methods of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0040] Figure 1 A front view of a reverse circulation cementing tool provided by an embodiment of the present invention;

[0041] Figure 2 A schematic diagram of the application of the reverse circulation cementing tool provided by an embodiment of the present invention;

[0042] Figures 3 to 5 for Figure 2 Cross-sectional views under different working conditions.

[0043] Icon: 100-outer shell; 110-upper shell; 120-lower shell; 111-flow channel; 112-water filling hole; 113-first concave cavity; 114-second concave cavity; 115-groove; 121-first through hole;

[0044] 200-two-stage actuating sleeve; 210-outer sleeve; 220-inner sleeve; 211-second through hole; 212-upper end;

[0045] 300-sensing module; 400-shear pin; 500-fluid filling chamber; 600-blocking piece;

[0046] 700 - activation assembly; 710 - activation detonator; 720 - pin push rod;

[0047] 800-floating shoe; 900-connecting sleeve; 1000-control module; 1100-power module; 1200-setting ball. DETAILED DESCRIPTION

[0048] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Generally, the components of the embodiments of the present invention described and shown in the drawings here can be arranged and designed in various different configurations.

[0049] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the invention claimed for protection, but merely represents selected embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0050] Some embodiments of the present invention are described in detail below in conjunction with the accompanying drawings. In the absence of conflict, the following embodiments and features in the embodiments can be combined with each other.

[0051] When using the reverse circulation cementing method for cementing, it is difficult to accurately know the time when the cement slurry reaches the bottom of the well and it is impossible to use conventional tools such as float shoes and float collars. After the cementing operation is completed, there will be an excessively long cement slurry plug left in the casing. If there is also a cement slurry plug in the casing in the production layer, drilling and plugging operations must be carried out, but this will seriously delay the construction period, and the casing may be damaged during the drilling and plugging process, thereby causing other unnecessary problems.

[0052] In view of this, the present invention provides a reverse circulation cementing tool, comprising an outer shell 100, a two-stage actuating sleeve 200, a sensing module 300 and an actuating assembly; the outer shell 100 is tubular and is provided with a first through hole 121 along its radial direction and penetrating its side wall; the two-stage actuating sleeve 200 is arranged in the outer shell 100, and comprises an outer sleeve 210 and an inner sleeve 220, wherein the outer sleeve 210 is slidably matched with the outer shell 100, and is provided with a second through hole 211 along its radial direction and penetrating its side wall, and the second through hole 211 is connected to the first through hole 121. The inner sleeve 220 is in the outer sleeve 210 in a posture of blocking the second through hole 211, and is connected to the outer sleeve 210 through the shear pin 400; the sensing module 300 is arranged on the side wall of the outer shell 100 and is on one side of the first through hole 121, so as to sense whether there is cement slurry in the outer shell 100; the actuating assembly is arranged on the outer shell 100 and is communicatively connected with the sensing module 300, and the actuating assembly is configured to move the outer sleeve 210 along the axial direction of the outer shell 100 after receiving the sensing information, so as to block the first through hole 121.

[0053] When the reverse circulation cementing tool is in the initial state, the inner sleeve 220 blocks the second through hole 211, blocking the connection between the outer shell 100 and the outside, thereby preventing the fluid from entering the outer shell 100; after the reverse circulation cementing tool is lowered into place with the casing, a sealing ball 1200 is put into the pipe, and the sealing ball 1200 falls until it is seated on the inner sleeve 220. By increasing the pressure, the sealing ball 1200 applies a downward force to the inner sleeve 220, and the shear pin 400 is subjected to the shear force. As the pressure continues to increase, the shear pin 400 is disconnected, and then the inner sleeve 220 moves downward, thereby releasing the blockage of the second through hole 211. At this time, the outer shell 100 passes through The second through hole 211 and the first through hole 121 are connected to the annulus; once the outer shell 100 is connected to the annulus, cement slurry is injected into the annulus, and after the cement slurry rises to the height of the first through hole 121, it enters the central channel of the outer shell 100 through the first through hole 121 and the second through hole 211; when the cement slurry rises in the central channel to pass through the sensing module 300, the sensing module 300 will transmit the corresponding sensing information to the actuating assembly, and the actuating assembly will start at this time, causing the outer sleeve 210 to move axially along the outer shell 100, thereby blocking the first through hole 121, and again blocking the connection between the outer shell 100 and the outside world, so that the cement slurry cannot enter the central channel.

[0054] It can be seen that compared with the existing technology, the reverse circulation cementing tool can ensure the smooth progress of reverse circulation cementing when used with the pipe string, so that the advantages of reverse circulation cementing technology can be fully utilized. The reverse circulation passage can also be closed when the cement slurry injection operation is completed to prevent the cement slurry from entering the casing hollow during the waiting process, thereby greatly reducing the risk during reverse circulation cementing construction.

[0055] It should be added here that there are multiple first via holes 121 and multiple second via holes 211, and the two correspond one to one, wherein the multiple first via holes 121 are distributed at intervals along the circumference of the outer shell 100, and the multiple second via holes 211 are distributed at intervals along the circumference of the outer sleeve 210.

[0056] The following combination Figures 1 to 5 The structure and shape of the reverse circulation cementing tool provided in this embodiment are described in detail:

[0057] For further reference, Figure 3The outer sleeve 210 has an upper end 212, which is located between the second through hole 211 and the sensing module 300, and is enclosed with the inner wall of the outer shell 100 to form a fluid-filled cavity 500; in the axial direction of the outer shell 100, the two opposite wall surfaces of the fluid-filled cavity 500 are respectively the surface of the upper end 212 close to the second through hole 211, and the surface of the outer shell 100 away from the second through hole 211; a flow channel 111 is formed in the side wall of the outer shell 100, and the flow channel 111 is located on the side of the fluid-filled cavity 500 away from the second through hole 211, and one end thereof is connected to the fluid-filled cavity 500, and the other end extends to the outside of the outer shell 100; the actuating assembly includes a blocking member 600 and an activation component 700, wherein the blocking member 600 blocks the flow channel 111, and the activation component 700 is configured to drive the blocking member 600 to release the blocking state after receiving the sensing information.

[0058] Specifically, refer to Figure 3 In the initial state, the lower end of the outer sleeve 210 contacts the float shoe 800 connected to the bottom of the outer shell 100, the inner sleeve 220 blocks the second through hole 211, the fluid filling cavity 500 is filled with water, and the blocking member 600 blocks the flow channel 111; after the setting ball 1200 is put into the setting ball 1200, the setting ball 1200 contacts the chamfered surface line of the opening on the inner sleeve 220 to form a seal, and the shear pin 400 is broken by increasing the pressure, and the inner sleeve 220 falls to abut against the float shoe 800, as shown in FIG. Figure 4 As shown, at this time, the second through hole 211 is connected to the central channel, that is, the annulus is connected to the central channel; after the annulus is connected to the central channel, refer to Figure 4 , cement slurry can enter the central channel from the annulus through the first through hole 121 and the second through hole 211, and at the same time exert an upward force on the outer sleeve 210, while the water in the fluid filling cavity 500 exerts a downward force on the outer sleeve 210 to prevent the outer sleeve 210 from sliding upward; when the cement slurry rises in the central channel and passes through the sensing module 300, the sensing module 300 senses the corresponding information and sends it to the activation component 700, and the activation component 700 drives the blocking member 600 to release the blocking state. At this time, under the push of the cement slurry, the outer sleeve 210 slides upward and squeezes the water out of the fluid filling cavity 500 until the fluid filling cavity 500 disappears. Figure 5 As shown, at this time, the first through hole 121 and the second through hole 211 are misaligned, and the outer sleeve 210 blocks the first through hole 121, so that the central channel and the annulus are blocked again, preventing cement slurry from continuing to enter the central channel.

[0059] Preferably, Figure 3As shown, the outer shell 100 is divided into an upper shell 110 and a lower shell 120, wherein one end of the upper shell 110 is inserted into the lower shell 120 and is threadedly connected to the lower shell 120; the flow channel 111 is formed in the upper shell 110, and the first through hole 121 is arranged in the lower shell 120; the upper end 212 includes a plug-in section and an extrusion section, wherein the plug-in section is plug-fitted with the upper shell 110, and its outer diameter is smaller than the outer diameter of the extrusion section, the extrusion section and the plug-in section are integrally formed and are located in the lower shell 120; the fluid filling cavity 500 is formed by the end face of the extrusion section, the outer wall of the plug-in section, the end face of the upper shell 110 and the inner wall of the lower shell 120, and is annular.

[0060] With the above design, when the outer sleeve 210 is subjected to an upward thrust from the cement slurry, the water in the fluid-filled cavity 500 can exert a force on the outer sleeve 210 opposite to the thrust, thereby preventing the outer sleeve 210 from sliding upward; after the blocking member 600 releases the blockage of the flow channel 111, the outer sleeve 210 can push the water out of the fluid-filled cavity 500 under the action of the thrust, thereby ensuring that the outer sleeve 210 slides upward smoothly, thereby achieving the blocking of the first through hole 121.

[0061] It should be added here that the reference Figure 3 The side wall of the upper housing 110 is provided with a water filling hole 112, which is connected to the flow passage 111; a plug is provided at the opening of the water filling hole 112 to plug the water filling hole 112. Such a design facilitates water injection into the fluid filling chamber 500.

[0062] For further reference, Figures 2 to 5 One end of the outer shell 100 is externally threadedly connected to a connecting sleeve 900, and the outer shell 100 and the inner wall of the connecting sleeve 900 are enclosed to form a fluid release chamber; the outer wall of the outer shell 100 in the fluid release chamber is provided with a first recess 113, and the first recess 113 is connected to the flow channel 111; the blocking member 600 and the activation assembly 700 are both in the first recess 113, and wherein the blocking member 600 includes a rupture disk, and the activation assembly 700 includes an activation detonator 710 and a pin push rod 720, the activation detonator 710 is communicatively connected to the sensing module 300, and the pin push rod 720 is arranged between the activation detonator 710 and the rupture disk.

[0063] Specifically, Figure 3For example, the coupling sleeve 900 is sleeved on the upper shell 110 and is threadedly connected to the upper part of the upper shell 110; along the axial direction of the upper shell 110, a plurality of grooves 115 are spaced apart on the outer wall of the upper shell 110, and each groove 115 extends along the circumferential direction of the upper shell 110, and the groove surface of the groove 115, the outer wall of the upper shell 110 and the inner wall of the coupling sleeve 900 are surrounded to form a fluid release chamber; the sensing module 300 can be a sensor of the density change recognition type or other types, and preferably, the sensing module 300 is a magnetic sensor, which can sense particles with high magnetic permeability, and the particles can be, for example, magnetite or hematite; refer to Figure 1 and Figure 3 The outer wall of the outer shell 100 is also provided with a second recess 114, and the actuating assembly also includes a control module 1000 and a power module 1100, both of which are located in the second recess 114, wherein the control module 1000 is electrically connected to the power module 1100, the sensing module 300 and the activation detonator 710, respectively, and the power module 1100 is electrically connected to the sensing module 300 and the activation detonator 710, respectively.

[0064] refer to Figure 4 and Figure 5 When cement slurry carrying particles enters the central channel, the magnetic sensor will sense the change in magnetic permeability of the cement slurry caused by the particles, and send a signal of reaction magnetic permeability to the control module 1000. When the magnetic permeability is at a set level, the control module 1000 sends an activation signal to the activation detonator 710. The activation detonator 710 is activated, generating a small pyrotechnic reaction, which will cause the pin push rod 720 to move downward into the rupture disk, causing the rupture disk to rupture. At this time, the fluid filling chamber 500 is connected to the fluid release chamber through the flow channel 111, thereby generating a pressure difference at the upper and lower ends of the outer sleeve 210. Under the action of the pressure difference, the outer sleeve 210 slides upward and pushes water to the fluid release chamber, while blocking the first through hole 121, closing the connection path between the central channel and the annulus.

[0065] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or replace some or all of the technical features therein with equivalents. However, these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A reverse circulation cementing tool, characterized in that: include: An outer shell (100), a dual-stage actuation sleeve (200), a sensing module (300) and an actuation assembly; The outer shell (100) is tubular and is provided with a first through hole (121) extending along its radial direction and penetrating its side wall; The dual-stage actuating sleeve (200) is arranged in the outer shell (100), and comprises an outer sleeve (210) and an inner sleeve (220), wherein the outer sleeve (210) is slidably matched with the outer shell (100), and is provided with a second through hole (211) along its radial direction and penetrating its side wall, and the second through hole (211) is communicated with the first through hole (121), and the inner sleeve (220) is located in the outer sleeve (210) in a posture of blocking the second through hole (211), and is connected to the outer sleeve (210) via a shear pin (400); The sensing module (300) is arranged on a side wall of the outer shell (100) and is located on one side of the first through hole (121) to sense whether cement slurry exists in the outer shell (100); The actuating assembly is disposed on the outer shell (100) and is communicatively connected to the sensing module (300). The actuating assembly is configured to move the outer sleeve (210) along the axial direction of the outer shell (100) to block the first through hole (121) after receiving sensing information.

2. The reverse circulation cementing tool according to claim 1, characterized in that: The outer sleeve (210) has an upper end portion (212), the upper end portion (212) is located between the second through hole (211) and the sensing module (300), and is enclosed with the inner wall of the outer shell (100) to form a fluid-filled cavity (500); In the axial direction of the outer shell (100), two opposite wall surfaces of the fluid-filled cavity (500) are respectively a surface of the upper end portion (212) close to the second through hole (211), and a surface of the outer shell (100) away from the second through hole (211); A flow channel (111) is formed in the side wall of the outer shell (100), the flow channel (111) is located on a side of the fluid filling cavity (500) away from the second via hole (211), one end of the flow channel (111) is connected to the fluid filling cavity (500), and the other end extends to the outside of the outer shell (100); The actuation assembly comprises a blocking member (600) and an activation component (700), wherein the blocking member (600) blocks the flow passage (111), and the activation component (700) is configured to drive the blocking member (600) to release the blocking state after receiving sensing information.

3. The reverse circulation cementing tool according to claim 2, characterized in that: The outer shell (100) is divided into an upper shell (110) and a lower shell (120), wherein one end of the upper shell (110) is inserted into the lower shell (120) and is threadedly connected to the lower shell (120); The flow passage (111) is formed in the upper shell (110), and the first through hole (121) is arranged in the lower shell (120); The upper end portion (212) comprises an inserting section and an extrusion section, wherein the inserting section is inserted and matched with the upper shell (110), and its outer diameter is smaller than the outer diameter of the extrusion section, and the extrusion section and the inserting section are integrally formed and are located in the lower shell (120); The end surface of the extrusion section, the outer wall of the plug-in section, the end surface of the upper shell (110) and the inner wall of the lower shell (120) together form the fluid-filled cavity (500).

4. The reverse circulation cementing tool according to claim 3, characterized in that: A water filling hole (112) is provided on the side wall of the upper shell (110), and the water filling hole (112) is in communication with the flow passage (111); A plug is provided at the opening of the water filling hole (112) to plug the water filling hole (112).

5. The reverse circulation cementing tool according to claim 3, characterized in that: One end of the lower shell (120) away from the upper shell (110) is connected to a float shoe (800); One end of the outer sleeve (210) away from the upper end portion (212) abuts against the float shoe (800).

6. The reverse circulation cementing tool according to claim 2, characterized in that: One end of the outer shell (100) is externally threadedly connected to a connecting sleeve (900), and the outer shell (100) and the inner wall of the connecting sleeve (900) are combined to form a fluid release cavity; The outer wall of the outer shell (100) in the fluid release chamber is provided with a first recess (113), and the first recess (113) is communicated with the flow passage (111); The blocking member (600) and the activation assembly (700) are both located in the first recess (113), wherein the blocking member (600) includes a rupture disk, and the activation assembly (700) includes an activation detonator (710) and a pin push rod (720), wherein the activation detonator (710) is communicatively connected to the sensing module (300), and the pin push rod (720) is disposed between the activation detonator (710) and the rupture disk.

7. The reverse circulation cementing tool according to claim 6, characterized in that: The outer wall of the outer shell (100) is further provided with a second recess (114); The actuation assembly further comprises a control module (1000) and a power module (1100) both of which are located in the second recess (114), wherein the control module (1000) is electrically connected to the power module (1100), the sensing module (300) and the activation detonator (710), respectively, and the power module (1100) is electrically connected to the sensing module (300) and the activation detonator (710), respectively.

8. The reverse circulation cementing tool according to claim 7, characterized in that: The sensing module (300) comprises a magnetic sensor, and the magnetic sensor is used to sense the change of magnetic permeability in the housing.

9. The reverse circulation cementing tool according to claim 6, characterized in that: Along the axial direction of the outer shell (100), a plurality of grooves (115) are arranged at intervals on the outer wall of the outer shell (100), and each of the grooves (115) extends along the circumferential direction of the outer shell (100); The groove surface of the groove (115), the outer wall of the outer shell (100) and the inner wall of the connecting sleeve (900) together form the fluid release chamber.

10. The reverse circulation cementing tool according to claim 1, characterized in that: The inner sleeve (220) is close to the opening chamfer of the sensing module (300).

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