A composite filling tool for oil field downhole operation

Abstract

The present invention relates to the technical field of downhole tools, and specifically discloses a composite filling tool for downhole operations in oil fields, comprising: a first shell, both ends of which are threadedly connected to a second shell, the second shell is provided with a sealing unit, and the second shell on the upper side is threadedly connected to an upper joint; a fixed sleeve, installed in the first shell, connected to a flow guide shell, and provided with a first through hole, the first through hole of the first shell is connected to the flow guide shell; a first sliding sleeve, slidably arranged in the fixed sleeve, provided with a second through hole, and a ball seat fixed therein, the ball seat is provided with a ball; a fixed plate, fixed to the first sliding sleeve, the first shell is provided with a sliding plate, and a spring is installed between the fixed plate and the sliding plate. The present invention completes the well washing and filling cementing operations of the oil field through a single movement of the first sliding sleeve, which significantly simplifies the construction process and improves work efficiency.

Description

Technical Field

[0001] The invention relates to the technical field of downhole tools, and in particular to a composite filling tool for downhole operations in oil fields. Background Art

[0002] When the formation around the oil well is sandstone, after the oil well enters the production stage, the sandstone may loosen due to changes in formation pressure or other factors, resulting in a large number of cavities in the well, accompanied by sand production. In order to deal with this problem, sand-carrying fluid is usually used to fill the cavities in the well to stabilize the well wall and prevent more sand and gravel from entering the well.

[0003] Before backfilling and cementing, the well washing operation must be completed first. The purpose of well washing is to remove excess sand and gravel from the well through the well washing fluid to ensure the cleanliness of the well and create good conditions for subsequent backfilling work. However, during the well washing and backfilling and cementing process, the existing process requires multiple lifting of the pipe string to achieve backwashing and backfilling and cementing of the oil well. This not only increases the workload of the construction personnel, but also prolongs the downhole operation time, making the entire cementing construction process cumbersome and inefficient, and ultimately affecting the efficiency of crude oil production.

[0004] In addition, existing filling tools cannot complete backwashing and filling operations in one go, further exacerbating the above problems. This step-by-step operation mode not only increases the complexity of construction, but also may introduce additional risks, such as tool failure or operating errors, which will have an adverse impact on the long-term performance of the oil well. Summary of the invention

[0005] The object of the present invention is to provide a composite filling tool for oil field downhole operations to solve the problems raised in the above background technology.

[0006] The present invention provides the following technical solution: a composite filling tool for oil field downhole operation, comprising:

[0007] A first shell, both ends of which are threadedly connected to a second shell, the second shell is provided with a sealing unit for separating a well, and the upper side of the second shell is threadedly connected to an upper joint;

[0008] A fixing sleeve is installed in the first shell and is connected with a flow guide shell. The first shell is provided with a first through hole. The first through hole of the first shell is connected with the flow guide shell.

[0009] A first sliding sleeve is slidably disposed in the fixed sleeve and is slidably connected to the upper joint, and is provided with a second through hole for communicating with the guide shell, and a ball seat is fixedly connected therein, and a ball is provided on the ball seat;

[0010] A fixed plate is fixedly connected to the first sliding sleeve, a sliding plate and a limiting sleeve that are in contact with each other are installed in the first shell, the sliding plate is fixedly connected to a guide rod, the guide rod penetrates the fixed plate and contacts the fixed sleeve, the limiting sleeve contacts the adjacent second shell, and a spring is installed between the fixed plate and the sliding plate.

[0011] Preferably, the first shell is provided with a circular hole, the circular hole of the first shell is located above the flow guide shell, there is a gap between the second shell and the first sliding sleeve, and the second shell on the upper side is provided with a liquid guide hole.

[0012] Preferably, the sealing unit comprises:

[0013] an elastic ring, mounted on the adjacent second shell;

[0014] A first sliding shell is slidably disposed on the outer side of the adjacent second shell and is in contact with the elastic ring;

[0015] A second sliding sleeve is slidably disposed in the adjacent second housing, a spring is installed between the second sliding sleeve and the adjacent second housing, and a gap exists between the second sliding sleeve and the first sliding sleeve;

[0016] A connecting rod, fixedly connected to the second sliding sleeve, and penetrating the adjacent second housing and slidably connected thereto, wherein the connecting rod is fixedly connected to the first sliding housing;

[0017] A limit block is fixedly connected to the first sliding sleeve, and the limit block is used to squeeze the second sliding sleeve.

[0018] Preferably, the distances between the limit blocks and the adjacent second sliding sleeves in the two sealing units are different, so that the first sliding sleeves move different distances to control the two sealing units to be in different working states.

[0019] Preferably, an annular cavity filled with gas is provided in the middle of the elastic ring.

[0020] Preferably, it also includes:

[0021] The limiting mechanism has two, and the two limiting mechanisms are respectively arranged in adjacent second shells, and the limiting mechanisms are used to limit the reciprocating movement of adjacent second sliding sleeves, and the limiting mechanisms include:

[0022] A fixed block, fixedly connected to the adjacent second sliding sleeve, wherein the fixed block is provided with an inclined surface;

[0023] A fixing rod, fixedly connected to the inner wall of the adjacent second shell;

[0024] A sliding block is limitedly slidably arranged on the fixed rod, the sliding block is provided with an inclined surface, the inclined surface of the fixed block is fitted with the inclined surface of the adjacent sliding block, and the limiting block is provided with an inclined surface, the inclined surface of the limiting block squeezes the adjacent sliding block.

[0025] Preferably, it also includes:

[0026] A sliding seat is slidably arranged on the outer side of the ball seat and slides in a sealed manner with the first sliding sleeve. A spring is installed between the sliding seat and the sliding plate. The sliding seat is provided with a rectangular hole. The sliding seat is located below the sphere.

[0027] Preferably, it also includes:

[0028] an annular sleeve, installed in the upper joint and in contact with the adjacent second housing, the first sliding sleeve being provided with a blind hole;

[0029] A limit pin is slidably disposed in the blind hole of the first sliding sleeve, and a spring is installed between the first sliding sleeve, and the annular sleeve and the upper joint are both in contact with the limit pin.

[0030] Preferably, the side of the annular sleeve close to the limit pin is an annular cutting edge, the upper joint and the annular sleeve form an annular cavity, and the annular cavity of the upper joint and the annular sleeve is used to accommodate the cut limit pin.

[0031] Preferably, it also includes:

[0032] A fixed shell is fixedly connected to the circular hole of the first shell, and a through hole is formed on a side wall of the fixed shell located inside the first shell;

[0033] A second sliding shell is slidably disposed in the fixed shell, and a spring is installed between the second sliding shell and the fixed shell, and the second sliding shell is used to block the through hole on the fixed shell;

[0034] An arc-shaped plate is fixedly connected to the second sliding sleeve on the upper side, and the arc-shaped plate is used to block the liquid guide hole.

[0035] The beneficial effects are as follows: the present invention controls the working state of the sealing units on the two second shells through a single movement of the first sliding sleeve, so that the device can complete the well washing and filling cementing operations of the oil field in a single time, which significantly simplifies the construction process and improves the work efficiency; the expansion size of the elastic ring is controlled and its stability after expansion is maintained by utilizing the extrusion between the sliding block and the adjacent fixed block, thereby ensuring the stability of the sealing effect achieved by the elastic ring; the reciprocating movement of the sliding seat is utilized to facilitate the device to perform well washing and filling cementing operations multiple times, thereby increasing the reusability of the device and improving the construction efficiency; the multiple limiting of the limit pin can prevent the pressure change in the wellbore from affecting the work of the elastic ring, ensure that it works at the specified position, and thus improve its stability during the working process; the second sliding shell is used to seal the through hole on the fixed shell, so that the sand-carrying liquid fills the hole to be filled with a certain degree of compactness, thereby ensuring the stability of the well wall after filling, and preventing the occurrence of formation collapse and sand production. BRIEF DESCRIPTION OF THE DRAWINGS

[0036] Figure 1 It is a schematic diagram of the three-dimensional structure of the present invention;

[0037] Figure 2 A cross-sectional view of the first shell and the second shell of the present invention;

[0038] Figure 3 It is a cross-sectional view of the first housing and the first sliding sleeve of the present invention;

[0039] Figure 4 It is a cross-sectional view of the first sliding sleeve and the ball seat of the present invention;

[0040] Figure 5 It is a cross-sectional view of the fixed sleeve and the first sliding sleeve of the present invention;

[0041] Figure 6 It is a cross-sectional view of the elastic ring and the first sliding shell of the present invention;

[0042] Figure 7 It is a schematic diagram of the three-dimensional structure of the fixed block and the sliding block of the present invention;

[0043] Figure 8 It is a cross-sectional view of the annular sleeve and the limiting pin of the present invention.

[0044] Figure numbers: 1. first shell, 11. second shell, 13. upper joint, 14. fixed sleeve, 15. guide shell, 16. first sliding sleeve, 161. ball seat, 162. sphere, 17. fixed plate, 18. sliding plate, 181. guide rod, 19. limit sleeve, 191. liquid guide hole, 2. elastic ring, 21. first sliding shell, 22. second sliding sleeve, 23. connecting rod, 24. limit block, 3. fixed block, 31. fixed rod, 32. sliding block, 4. sliding seat, 5. annular sleeve, 51. limit pin, 6. fixed shell, 61. second sliding shell, 63. arc plate. DETAILED DESCRIPTION

[0045] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. 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.

[0046] Embodiment 1: A composite filling tool for oil field downhole operation, such as Figure 1-Figure 6 As shown, it includes: a first shell 1, both ends of which are threadedly connected to the second shell 11, the second shell 11 is provided with a sealing unit for separating the well, and the upper second shell 11 on the upper side is threadedly connected to the upper joint 13; a fixed sleeve 14, which is installed in the first shell 1 and is connected to the guide shell 15, the first shell 1 is provided with a first through hole, and the first through hole of the first shell 1 is connected to the guide shell 15; a first sliding sleeve 16, which is slidably arranged in the fixed sleeve 14 and slidably connected to the upper joint 13, is provided with a second through hole for connecting to the guide shell 15, and a ball seat 161 is fixedly connected therein, and a ball seat 161 is provided on the ball seat 161 A sphere 162 is arranged; a fixed plate 17 is fixedly connected to the first sliding sleeve 16; a sliding plate 18 and a limiting sleeve 19 which are in contact with each other are installed in the first shell 1; a guide rod 181 is fixedly connected to the sliding plate 18; the guide rod 181 penetrates the fixed plate 17 and contacts the fixed sleeve 14; the limiting sleeve 19 contacts the adjacent second shell 11; a spring is installed between the fixed plate 17 and the sliding plate 18; a circular hole is arranged on the first shell 1; the circular hole of the first shell 1 is located above the guide shell 15; there is a gap between the second shell 11 and the first sliding sleeve 16; a liquid guide hole 191 is arranged on the upper second shell 11.

[0047] In the above scheme, a limiting ring is provided on the inner wall of the first shell 1, the upper surface of the fixing sleeve 14 contacts the limiting ring of the first shell 1, and a rubber pad is provided on the upper surface of the fixing sleeve 14, and the rubber pad of the fixing sleeve 14 is used to increase the friction between it and the second shell 11, and the upper side surface of the ball seat 161 is provided with an arc surface in contact with the ball 162. The length of the first shell 1 is set according to actual needs, so that the device can fill the holes within the specified range. In the accompanying drawings, the number of guide rods 181 is four circumferentially equidistantly distributed (this number is the number expressed in the figure, and the actual number can be set accordingly according to actual needs, and the following description of the number is the same), there are four liquid guide holes 191, the first shell 1 has four first through holes circumferentially equidistantly distributed, and the first sliding sleeve 16 has four second through holes circumferentially equidistantly distributed.

[0048] like Figure 2 , Figure 6 and Figure 7 As shown, the sealing unit includes: an elastic ring 2, which is installed on the adjacent second shell 11, and a gas-filled annular cavity is arranged in the middle of the elastic ring 2; a first sliding shell 21, which is slidably arranged on the outside of the adjacent second shell 11 and contacts the elastic ring 2; a second sliding sleeve 22, which is slidably arranged in the adjacent second shell 11, and a spring is installed between the second sliding sleeve 22 and the adjacent second shell 11, and there is a gap between the second sliding sleeve 22 and the first sliding sleeve 16; a connecting rod 23, which is fixedly connected to the second sliding sleeve 22, penetrates the adjacent second shell 11 and is slidably connected thereto, and the connecting rod 23 is fixedly connected to the first sliding shell 21; a limit block 24, which is fixedly connected to the first sliding sleeve 16, and the limit block 24 is used to squeeze the second sliding sleeve 22.

[0049] In the above scheme, there are three elastic rings 2, and a "conical surface" is provided on the lower surface of the first sliding shell 21. The diameter of the "conical surface" of the first sliding shell 21 gradually decreases from top to bottom. The "conical surface" of the first sliding shell 21 squeezes the adjacent elastic ring 2 to make it expand outward. The elastic ring 2 expands and fits the wellbore to complete the isolation of the wellbore. There are four connecting rods 23 that are equidistantly distributed circumferentially.

[0050] like Figure 6 and Figure 7 As shown, the distances between the limit blocks 24 and the adjacent second sliding sleeves 22 in the two sealing units are different, so that the first sliding sleeve 16 moves different distances to control the two sealing units to be in different working states.

[0051] In the above scheme, the distance between the limit block 24 and the second sliding sleeve 22 in the lower second shell 11 is smaller than the distance between the limit block 24 and the second sliding sleeve 22 in the upper second shell 11, and the vertical length of the lower limit block 24 is greater than the vertical length of the upper limit block 24.

[0052] Specific working principle: the device is installed on the pipe column, and then the device is moved to the specified position in the wellbore through the pipe column (where the first shell 1 is opposite to the hole, and the two second shells 11 are located on the upper and lower sides of the hole in the wellbore), and then a liquid of specified pressure is injected into the pipe column. The liquid flows downward through the first sliding sleeve 16, and the flowing liquid impacts the ball 162 that fits the ball seat 161. The liquid cannot pass through the ball seat 161. At this time, the pressure of the injected liquid acts on the first sliding sleeve 16 through the ball 162 and the ball seat 161, and the first sliding sleeve 16 drives the two limit blocks 24 and the fixed plate 17 to move downward, and the fixed plate 17 moves downward to compress the connected spring.

[0053] During the downward movement of the first sliding sleeve 16, the lower limit block 24 first squeezes the adjacent second sliding sleeve 22 to move downward and compresses the connected spring. The second sliding sleeve 22 drives the adjacent first sliding shell 21 to move downward through the adjacent connecting rod 23. The first sliding shell 21 moves to squeeze the adjacent elastic ring 2 to expand and fit the inner wall of the well. At this time, the well is sealed. After the first sliding sleeve 16 is moved, it remains relatively still relative to the first shell 1. At this time, the upper limit block 24 does not contact the adjacent second sliding sleeve 22, and in this process, the second through hole on the first sliding sleeve 16 is gradually connected with the adjacent guide shell 15. The injected liquid passes through the second through hole on the first sliding sleeve 16, the guide shell 15 and the first through hole on the first shell 1, and then the liquid flows upward between the first shell 1 and the well. The flowing liquid flushes the well. Finally, the liquid carries excess sand and gravel and is discharged from the well to complete the well washing operation.

[0054] After the well washing is completed, the pressure of the injected liquid is increased. At this time, the first sliding sleeve 16 continues to move downward. During this process, the upper limit block 24 moves to squeeze the adjacent second sliding sleeve 22, so that the elastic ring 2 on the upper second shell 11 expands and blocks the well, and the injected liquid is replaced with sand-carrying liquid. The sand-carrying liquid flows from bottom to top to fill the cavity between the first shell 1 and the well. At this time, the sand-carrying liquid is filled from bottom to top, which makes it easier for the sand-carrying liquid to evenly fill the cavity and ensure the filling compactness, that is, to improve the filling effect.

[0055] During the process of the sand-carrying liquid filling the space between the first shell 1 and the wellbore, the replaced liquid enters the first shell 1 through the circular hole on the first shell 1, and then the liquid flows upward through the first sliding sleeve 16 and the upper second sliding sleeve 22, and then the liquid enters the space between the wellbore and the upper joint 13 through the liquid guide hole 191 of the upper second shell 11, and then the liquid flows upward to the wellhead, thereby completing the filling and cementing operation (the amount of sand-carrying liquid injected can adopt the estimated demand: according to the geological data and design parameters, the total amount of sand-carrying liquid required is calculated in advance, and when the actual volume of sand-carrying liquid pumped in reaches or approaches the estimated value, the filling operation is likely to be completed).

[0056] The single movement of the first sliding sleeve 16 completes the two operations of well washing and filling cementing, which significantly simplifies the construction process and improves work efficiency. After the work is completed, the injection of liquid is stopped. Under the elastic force of the spring connected to the second sliding sleeve 22, the second sliding sleeve 22 drives the adjacent first sliding shell 21 to reset through the adjacent connecting rod 23, so that the elastic ring 2 is reset and releases the contact with the wellway. At the same time, under the elastic force of the spring connected to the fixed plate 17, the first sliding sleeve 16 is reset, and the device can be taken out later.

[0057] Embodiment 2: Based on embodiment 1, Figure 6 and Figure 7 As shown, it also includes: a limiting mechanism, which has two, and the two limiting mechanisms are respectively arranged in the adjacent second shells 11, and the limiting mechanism is used to limit the reciprocating movement of the adjacent second sliding sleeves 22, and the limiting mechanism includes: a fixed block 3, which is fixed to the adjacent second sliding sleeves 22, and the fixed block 3 is provided with an inclined surface; a fixed rod 31, which is fixed to the inner wall of the adjacent second shell 11; a sliding block 32, which is limited and slidably arranged on the fixed rod 31, and the sliding block 32 is provided with an inclined surface, and the inclined surface of the fixed block 3 is in contact with the inclined surface of the adjacent sliding block 32, and the limiting block 24 is provided with an inclined surface, and the inclined surface of the limiting block 24 squeezes the adjacent sliding block 32.

[0058] In the above scheme, the inclined surface of the fixed block 3, the inclined surface of the sliding block 32 and the inclined surface of the limit block 24 gradually approach the center line of the first sliding sleeve 16 from top to bottom, and a ball is provided on the side of the sliding block 32 away from the adjacent fixed block 3. The ball of the sliding block 32 is used to reduce the friction between it and the adjacent limit block 24. The limit block 24 is provided with a vertical surface, wherein the movement of the limit block 24 causes its upper inclined surface to squeeze the adjacent sliding block 32 to move, and the movement of the sliding block 32 squeezes the inclined surface of the adjacent fixed block 3 through its upper inclined surface, so that the fixed block 3 drives the adjacent second sliding sleeve 22 to move down a specified distance, and the second sliding sleeve 22 moves downward and repeats the above operation, so that the elastic ring 2 expands and blocks the well. After the sliding block 32 is fitted with the vertical surface of the adjacent limit block 24, it is ensured that the elastic ring 2 in the expanded state stably fits the well, and it is avoided that pressure fluctuations cause the first sliding sleeve 16 to drive the limit block 24 to float up and down, affecting the stability of the sealing effect applied by the elastic ring 2.

[0059] Embodiment 3: Based on embodiment 2, Figure 4 As shown, it also includes: a sliding seat 4, which is slidably arranged on the outside of the ball seat 161 and seals and slides with the first sliding sleeve 16, a spring is installed between the sliding seat 4 and the sliding plate 18, the sliding seat 4 is provided with a rectangular hole, and the sliding seat 4 is located below the ball 162.

[0060] In the above scheme, the upper surface of the sliding seat 4 is provided with an arc surface that fits with the ball 162. When the well washing operation is performed, as the liquid flows in the first sliding sleeve 16, the flowing liquid impacts the ball 162 that fits the sliding seat 4. As the pressure of the injected liquid increases, the ball 162 squeezes the sliding seat 4 downward and compresses the connected spring. When the sliding seat 4 moves down to the ball seat 161 to cover the rectangular hole on the sliding seat 4, the liquid pressure acts on the first sliding sleeve 16 through the ball 162 and the ball seat 161. Thereafter, the above operation is repeated to wash the well. Under the elastic force of the spring connected to the sliding seat 4, the liquid within a certain pressure range can flow normally in the first sliding sleeve 16, which is convenient for the device to perform other downhole operations, thereby improving the application diversity of the device.

[0061] like Figure 2 and Figure 8 As shown, it also includes: an annular sleeve 5, which is installed in the upper joint 13 and contacts the adjacent second shell 11, and the first sliding sleeve 16 is provided with a blind hole; a limit pin 51, which is slidably arranged in the blind hole of the first sliding sleeve 16, and a spring is installed between the annular sleeve 5 and the upper joint 13, and both the annular sleeve 5 and the upper joint 13 are in contact with the limit pin 51; the side of the annular sleeve 5 close to the limit pin 51 is an annular cutting blade, and the upper joint 13 and the annular sleeve 5 form an annular cavity, and the annular cavity of the upper joint 13 and the annular sleeve 5 is used to receive the limit pin 51 after being cut.

[0062] In the above scheme, there are two limit pins 51 symmetrically distributed, an annular groove is provided in the middle of the upper joint 13, and the center line of the limit pin 51 is located at the edge of the annular groove on the upper joint 13, so that part of the side surface of the limit pin 51 is in contact with the inner wall of the upper joint 13, and the inner wall of the upper joint 13 is provided with an annular protrusion, and the annular protrusion of the upper joint 13 limits the movement of the annular sleeve 5, and the spring connected to the limit pin 51 is always in a compressed state, and the limit pin 51 contacts the cutting edge of the annular sleeve 5, and the limit pin 51 limits the first sliding sleeve 16 Move to avoid the first sliding sleeve 16 from moving relative to the first shell 1 during the movement of the device in the wellbore driven by the pipe column. When the device is located at the cavity, repeat the above operation and inject liquid with a specified pressure. The liquid pressure acts on the first sliding sleeve 16. At this time, the downward pressure on the first sliding sleeve 16 causes the cutting edge of the annular sleeve 5 to cut off the limit pin 51. The cut limit pin 51 is located in the annular cavity of the upper joint 13 and the annular sleeve 5. The subsequent liquid pressure causes the first sliding sleeve 16 to move downward and repeat the above well washing and filling cementing operations.

[0063] After the filling and cementing operation is completed, the injection of liquid is stopped, and the first sliding sleeve 16 is reset. Due to the elastic force of the spring connected to the limiting pin 51, the limiting pin 51 is re-located above the cutting edge on the annular sleeve 5, and the first sliding sleeve 16 is in a limited state again, which is convenient for the device to perform multiple filling and cementing operations and improve the construction efficiency of the device.

[0064] like Figure 2 and Figure 6 As shown, it also includes: a fixed shell 6, which is fixedly connected to the circular hole of the first shell 1, and a through hole is opened on the side wall of the fixed shell 6 located in the first shell 1; a second sliding shell 61, which is slidably arranged in the fixed shell 6, and a spring is installed between the second sliding shell 6 and the fixed shell 6, and the second sliding shell 61 is used to block the through hole on the fixed shell 6; an arc plate 63, which is fixedly connected to the second sliding sleeve 22 on the upper side, and the arc plate 63 is used to block the liquid guide hole 191.

[0065] In the above scheme, the fixed shell 6 has four parts, and the fixed shell 6 has four through holes. In the initial state, the spring connected to the second sliding shell 61 is in a compressed state. During the above filling and cementing operation, when the sand-carrying liquid is injected between the first shell 1 and the wellbore, the second sliding shell 61 is affected by the elastic force of the spring connected to the second sliding shell 61, and the second sliding shell 61 prevents the liquid from entering the first shell 1 through the through holes on the fixed shell 6, so that the sand-carrying liquid fills the space between the first shell 1 and the wellbore with a certain pressure, thereby ensuring that the sand-carrying liquid fills the cavity to be filled with a certain degree of compactness, thereby ensuring the stability of the wellbore wall after filling, and preventing the occurrence of formation collapse and sand production.

[0066] The above description is only a specific implementation mode of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can easily think of changes or substitutions within the technical scope provided by the present invention, which should be covered within the protection scope of the present invention.

Claims

1. A composite filling tool for downhole operations in oil fields, Its characteristics include: A first shell (1), both ends of which are threadedly connected to a second shell (11), the second shell (11) being provided with a sealing unit for separating a well, and the upper side of the second shell (11) being threadedly connected to an upper joint (13); a fixing sleeve (14) installed in the first shell (1) and connected to the flow guide shell (15); the first shell (1) is provided with a first through hole; the first through hole of the first shell (1) is connected to the flow guide shell (15); A first sliding sleeve (16) is slidably disposed in the fixed sleeve (14), is slidably connected to the upper joint (13), is provided with a second through hole for communicating with the guide shell (15), and has a ball seat (161) fixed therein, and a ball body (162) is disposed on the ball seat (161); a fixed plate (17) fixedly connected to the first sliding sleeve (16); a sliding plate (18) and a limiting sleeve (19) in contact with each other are installed in the first shell (1); the sliding plate (18) is fixedly connected to a guide rod (181); the guide rod (181) penetrates the fixed plate (17) and contacts the fixed sleeve (14); the limiting sleeve (19) contacts the adjacent second shell (11); and a spring is installed between the fixed plate (17) and the sliding plate (18); The sealing unit comprises: An elastic ring (2) mounted on the adjacent second shell (11); A first sliding shell (21) is slidably disposed on the outer side of the adjacent second shell (11) and is in contact with the elastic ring (2); A second sliding sleeve (22) is slidably disposed in the adjacent second housing (11), and a spring is installed between the second sliding sleeve (22) and the adjacent second housing (11), and a gap exists between the second sliding sleeve (22) and the first sliding sleeve (16); A connecting rod (23) is fixedly connected to the second sliding sleeve (22), penetrates the adjacent second housing (11) and is slidably connected thereto, the connecting rod (23) being fixedly connected to the first sliding housing (21); A limit block (24) is fixedly connected to the first sliding sleeve (16), and the limit block (24) is used to squeeze the second sliding sleeve (22); Also included are: The limiting mechanisms include two limiting mechanisms, which are respectively arranged in adjacent second housings (11), and are used to limit the reciprocating movement of adjacent second sliding sleeves (22). The limiting mechanisms include: A fixed block (3) fixedly connected to the adjacent second sliding sleeve (22), the fixed block (3) being provided with an inclined surface; A fixing rod (31) fixedly connected to an inner wall of the adjacent second shell (11); A sliding block (32) is provided on the fixed rod (31) in a limited sliding manner, the sliding block (32) is provided with an inclined surface, the inclined surface of the fixed block (3) is in contact with the inclined surface of an adjacent sliding block (32), the limiting block (24) is provided with an inclined surface, and the inclined surface of the limiting block (24) presses the adjacent sliding block (32).

2. A composite filling tool for oilfield downhole operations according to claim 1, characterized in that: The first shell (1) is provided with a circular hole, the circular hole of the first shell (1) is located above the flow guide shell (15), there is a gap between the second shell (11) and the first sliding sleeve (16), and the second shell (11) on the upper side is provided with a liquid guide hole (191).

3. A composite filling tool for oilfield downhole operations according to claim 1, characterized in that: The distances between the limit blocks (24) and the adjacent second sliding sleeves (22) in the two sealing units are different, so that the first sliding sleeve (16) moves different distances to control the two sealing units to be in different working states.

4. A composite filling tool for oilfield downhole operations according to claim 1, characterized in that: An annular cavity filled with gas is provided in the middle of the elastic ring (2).

5. A composite filling tool for oilfield downhole operations according to claim 1, characterized in that: Also included are: A sliding seat (4) is slidably arranged on the outside of the ball seat (161) and slides in a sealed manner with the first sliding sleeve (16); a spring is installed between the sliding seat (4) and the sliding plate (18); the sliding seat (4) is provided with a rectangular hole; and the sliding seat (4) is located below the ball (162).

6. A composite filling tool for oilfield downhole operations according to claim 1, characterized in that: Also included are: an annular sleeve (5) installed in the upper joint (13) and in contact with the adjacent second shell (11); the first sliding sleeve (16) is provided with a blind hole; A limit pin (51) is slidably disposed in a blind hole of the first sliding sleeve (16), and a spring is installed between the first sliding sleeve (16). Both the annular sleeve (5) and the upper joint (13) are in contact with the limit pin (51).

7. A composite filling tool for oilfield downhole operations according to claim 6, characterized in that: The side of the annular sleeve (5) close to the limiting pin (51) is an annular cutting edge, and the upper joint (13) and the annular sleeve (5) form an annular cavity, and the annular cavity of the upper joint (13) and the annular sleeve (5) is used to receive the limiting pin (51) after being cut.

8. A composite filling tool for oilfield downhole operations according to claim 2, characterized in that: Also included are: A fixed shell (6) is fixedly connected to the circular hole of the first shell (1), and a through hole is formed on a side wall of the fixed shell (6) located inside the first shell (1); A second sliding shell (61) is slidably disposed in the fixed shell (6), and a spring is installed between the second sliding shell and the fixed shell (6), and the second sliding shell (61) is used to block a through hole on the fixed shell (6); The arc-shaped plate (63) is fixedly connected to the second sliding sleeve (22) on the upper side, and the arc-shaped plate (63) is used to block the liquid guide hole (191).

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