A composite packing tool for oilfield downhole operations

Abstract

This invention relates to the field of oil extraction technology, and more particularly to a composite filling tool for oilfield downhole operations. It includes: a shell, on which a working tubing string is installed; uniformly distributed receiving cavities are arranged on the periphery of the shell; slips are slidably connected within each receiving cavity; and communication holes are provided near each receiving cavity within the shell, connecting the corresponding receiving cavity to the interior of the shell. Adjustment controls are slidably connected within each communication hole. This invention isolates the receiving cavities by sealing the communication holes with adjustment controls. After the slips abut against the casing, by isolating some fluid within the receiving cavities, the fluid within the receiving cavities provides support for the slips, maintaining the stability of the pressure exerted by the slips on the casing. This improves the stability of the filling tool during operation and reduces the probability of casing and tool damage and sand barrier failure.

Description

Technical Field

[0001] This invention relates to the field of oil extraction technology, and in particular to a composite filling tool for oilfield downhole operations. Background Technology

[0002] A packing tool is a downhole tool used for sand control in oilfields. It primarily uses high-pressure gravel packing and other processes to form a high-permeability packing layer around the wellbore to achieve sand control. A packing tool is a tool string composed of a series of connected modules, mainly including: an inner packing converter, a release device, an anchoring device, a packer, a setting and sealing device, a packing port, and a sealing device. A hydraulic anchor is one type of anchoring device. The hydraulic anchor uses the pressure difference between its inner and outer sides to drive its anchor claws to extend, allowing the claws to abut against the casing, thus maintaining the stability of the packing tool during operation. However, factors such as changes in reservoir pressure and packer failure can cause variations in the pressure difference between the inner and outer sides of the hydraulic anchor, leading to… The pressure exerted by the anchor claws on the casing wall changes. If the pressure increases, it can easily cause irreversible damage to the casing. If the pressure decreases, anchoring failure is likely to occur, leading to axial movement or radial vibration of the packing tool. Axial movement can easily cause wear or dissolution of the packer sleeve, destroying the interlayer seal and causing interlayer flow. It can also cause the filling port position to become inaccurate, affecting the continuity of gravel filling. In severe cases, it can even cause the release mechanism to disengage prematurely and the tool to fall into the well. Radial vibration can cause uneven wear and impact between the tool and the casing, damaging the inner wall of the casing and the tool body, causing loosening of the tubing threads and fatigue fracture. Furthermore, vibration can destroy the existing gravel filling layer structure, leading to the failure of the sand control barrier and increasing the risk of sand production. Summary of the Invention

[0003] This invention provides a composite filling tool for oilfield downhole operations, which overcomes the shortcomings of existing filling tools whose anchoring devices are easily affected by pressure changes, resulting in damage to the casing and tool, and failure of the sand control barrier.

[0004] The technical solution is as follows: A composite filling tool for oilfield downhole operations includes: a shell, on which a working pipe string is installed; uniformly distributed receiving cavities are provided on the periphery of the shell; slips are slidably connected to the receiving cavities; a connecting hole is provided near each of the receiving cavities in the shell, communicating with the corresponding receiving cavity; the connecting hole connects the corresponding receiving cavity to the interior of the shell; an adjusting control is slidably connected in the connecting hole, the adjusting control is used to block the corresponding connecting hole; a magnetic ring is embedded near the slip of the adjusting control, the magnetic ring is used to maintain the stability of the relative position between the adjusting control and the shell; a wedge is slidably connected near the adjusting control in the shell; a first elastic element is fixed between the wedge and the shell; a limiting groove is provided on the adjusting control for accommodating the corresponding wedge; and a control mechanism is provided in the adjusting control for adjusting its limiting state relative to the corresponding wedge.

[0005] Furthermore, an external flow channel is provided in the middle of the adjustment control on the side near the axis of the housing, and an adjustment channel communicating with the external flow channel is provided on the periphery of the adjustment control. The blocking state of the adjustment control on the connecting hole can be adjusted by changing the position of the adjustment control. An annular limiting part is provided on the side of the adjustment control away from the axis of the housing. The annular limiting part is used to limit the extreme position of the adjustment control, and the magnetic ring is located in the corresponding annular limiting part.

[0006] Furthermore, the control mechanism includes: a detection shell fixed to the corresponding control unit; a squeezing column is slidably connected to the detection shell near the position of the corresponding wedge, the squeezing column being used to squeeze the corresponding wedge; a squeezing disc is slidably connected inside the detection shell; one end of the squeezing column near the corresponding squeezing disc is hemispherical, the squeezing disc being used to squeeze the corresponding squeezing column; a following disc is slidably connected inside the detection shell; a fluid medium is stored between the squeezing disc and the following disc inside the detection shell; a second elastic element is provided between the opposite sides of the squeezing disc and the following disc and the detection shell; and a pressure-sensing component is provided inside the detection shell for sensing the pressure inside the shell.

[0007] Furthermore, the pressure-sensing assembly includes: a pressure-sensing element, which is sealed and slidably connected to the corresponding detection shell; the extrusion disc and the following disc are both sealed and slidably connected to the pressure-sensing element; one end of the pressure-sensing element protrudes from the corresponding detection shell near the axis of the shell; a third elastic element is fixedly connected between the side of the pressure-sensing element away from the axis of the shell and the corresponding detection shell; a limiting protrusion is provided on the detection shell near the position corresponding to the third elastic element; the limiting protrusion is used to limit the extreme position of the corresponding pressure-sensing element; a power disc is fixedly connected to the pressure-sensing element; the power disc is located between the corresponding extrusion disc and the corresponding following disc; the diameter of the power disc is smaller than the inner diameter of the detection shell, that is, there is a gap between the periphery of the power disc and the detection shell, and this gap is used for the flow of the fluid medium.

[0008] Furthermore, when the extrusion disc is in contact with the corresponding extrusion post, the minimum distance between the pressure sensing element and the corresponding limiting protrusion is not greater than the minimum distance between the power disc and the corresponding following disc.

[0009] Furthermore, the elastic coefficient of the second elastic element is greater than that of the first elastic element.

[0010] Furthermore, a fixing member is fixedly connected to the housing near all the slips. The fixing member is used to limit the extreme position of the corresponding adjustment control. The fixing member is located in the corresponding receiving cavity. A damping cavity is provided in the fixing member. The damping cavity contains a fluid medium. The detection shell is sealed and slidably connected to the corresponding fixing member. An annular expansion portion is provided on the side of the detection shell near the corresponding fixing member. The annular expansion portion slides sealed within the corresponding fixing member. A plurality of damping through holes are provided on the annular expansion portion. The damping through holes are used to allow the fluid medium to flow.

[0011] Furthermore, the projection of the kava on its end face is elliptical.

[0012] Furthermore, an elastic ring is fixed to the side of the annular expansion portion near the axis of the housing, and the elastic ring is used to block the adjacent damping through hole.

[0013] Furthermore, a fourth elastic element is fixedly connected between the slip and the corresponding fixing member. The slip has equidistantly distributed protrusions on the side away from the housing axis, and an elastic strip is fixedly connected between two adjacent protrusions on the slip.

[0014] In summary, this application includes at least one of the following beneficial technical effects: By adjusting the control to block the connecting hole, the present invention isolates the receiving cavity. After the slip and the casing abut, by isolating part of the fluid in the receiving cavity, the fluid in the receiving cavity provides support for the slip, thereby maintaining the stability of the squeezing force of the slip on the casing. This improves the stability of the filling tool during operation and reduces the probability of damage to the casing and tool and failure of the sand barrier.

[0015] By changing the shape of the slips, rotation is prevented, thus preventing slip deflection and reducing the number of gaps during slip extension and retraction, thereby reducing the probability of sand jamming and improving the reliability of anchoring operations.

[0016] The anchoring effect is enhanced by the convex ridges of the slips, and after anchoring, the gaps of the convex ridges on the slips are sealed by the elastic strip, preventing the fluid in the annulus from contacting the convex ridge side of the slips, reducing the axial extrusion force exerted by the fluid in the annulus on the slips, and thus reducing the degree to which the extrusion force of the slips on the casing changes due to pressure changes in the annulus. Attached Figure Description

[0017] Figure 1 This is a three-dimensional structural diagram of the present invention; Figure 2 This is a three-dimensional structural cross-sectional view of the housing of the present invention; Figure 3 This is a three-dimensional structural diagram of the adjustment control and detection shell of the present invention; Figure 4 This is a three-dimensional structural diagram of the adjustment mechanism and fixing component of the present invention; Figure 5 This is a three-dimensional structural cross-sectional view of the swivel and control mechanism of the present invention; Figure 6 This is a three-dimensional structural cross-sectional view of the detection shell and fastener of the present invention; Figure 7 This is a three-dimensional structural diagram of the extrusion disc and pressure sensing element of the present invention; Figure 8 This is a three-dimensional structural diagram of the pressure-sensing component and the power plate of the present invention.

[0018] The markings in the attached diagram are as follows: 1: Housing, 2: Working pipe string, 3: Slip, 301: Receiving cavity, 302: Connecting hole, 4: Adjustment control, 401: External flow channel, 402: Control flow channel, 403: Annular limiting part, 5: Magnetic ring, 6: Wedge block, 601: Limiting groove, 7: First elastic element, 8: Detection housing, 801: Annular outward expansion part, 802: Damping through hole, 9: Extrusion column, 10: Extrusion disc, 11: Second elastic element, 12: Following disc, 13: Pressure sensing element, 131: Limiting protrusion, 14: Third elastic element, 15: Power disc, 16: Fixing element, 161: Damping cavity, 17: Elastic ring, 18: Fourth elastic element, 19: Elastic strip. Detailed Implementation

[0019] To make the technical means, creative features, objectives and effects of this invention easier to understand, the invention will be further described below in conjunction with specific embodiments.

[0020] Example 1 It should be noted that the state shown in the accompanying drawings of this application is the state before the filling tool is lowered into the well, and the "initial" state described herein refers to the state shown in the accompanying drawings.

[0021] This embodiment provides a composite filling tool for oilfield downhole operations, which solves the problem that the anchoring device of existing filling tools is easily affected by pressure changes, causing damage to the casing and tools and failure of the sand control barrier.

[0022] See Figures 1 to 5A composite filling tool for oilfield downhole operations includes: a shell 1, a working pipe string 2 installed on the shell 1, and six evenly distributed receiving cavities 301 on the periphery of the shell 1 (this number is the number shown in the attached drawings; the actual number can be set according to actual needs, and the following description of the number is the same). Slips 3 are slidably connected to the receiving cavities 301. A connecting hole 302 is provided near each receiving cavity 301 in the shell 1, communicating with the corresponding receiving cavity 301. The connecting hole 302 connects the corresponding receiving cavity 301 to the interior of the shell 1. An adjustment control 4 is slidably connected in the connecting hole 302, used to block the corresponding connecting hole 302. An external flow channel 401 is provided in the middle of the side of the adjustment control 4 near the axis of the shell 1, and the external flow channel 401 is always connected to the interior of the shell 1. Two regulating flow channels 402 are provided on the periphery of the adjustment control 4, communicating with the external flow channel 401. By changing the position of the adjustment control 4... To adjust the blocking state of the control device 4 on the connecting hole 302, initially, the inner circumference of the connecting hole 302 completely blocks the control flow channel 402, so that the control flow channel 402 is not connected to the receiving cavity 301; an annular limiting part 403 is provided on the side of the control device 4 away from the axis of the housing 1. The annular limiting part 403 is used to limit the extreme position of the control device 4. A magnetic ring 5 is embedded in the annular limiting part 403. There is a magnetic attraction between the magnetic ring 5 and the housing 1. The relative position of the corresponding control device 4 and the housing 1 is kept stable by the magnetic attraction; two symmetrically distributed wedges 6 are slidably connected to the position of the housing 1 near the control device 4. A first elastic element 7 is fixed between the wedges 6 and the housing 1. The first elastic element 7 is a spring, and in the initial state, the first elastic element 7 is in a stored state; two limiting grooves 601 are provided on the control device 4. The limiting grooves 601 are used to accommodate the corresponding wedges 6. The control device 4 is provided with a control mechanism for adjusting its limiting state with the corresponding wedges 6.

[0023] The above setup enables the isolation of the receiving cavity 301 by blocking the connecting hole 302 with the control switch 4. After the slip 3 comes into contact with the casing, the fluid in the receiving cavity 301 is isolated, and the fluid in the receiving cavity 301 provides support for the slip 3, thereby maintaining the stability of the squeezing pressure of the slip 3 on the casing. This improves the stability of the filling tool during operation and reduces the probability of damage to the casing and tool and failure of the sand barrier.

[0024] See Figures 3 to 8The control mechanism includes: a detection shell 8, fixed to the corresponding control control 4; a squeezing column 9 is slidably connected to the detection shell 8 near the corresponding wedge 6, the squeezing column 9 is used to squeeze the corresponding wedge 6, initially, the wedge 6 is squeezed by the corresponding squeezing column 9 and is not in the corresponding limiting groove 601; a squeezing disc 10 is slidably connected inside the detection shell 8, the end of the squeezing column 9 near the corresponding squeezing disc 10 is hemispherical, the squeezing disc 10 is used to squeeze the corresponding squeezing column 9, initially the squeezing disc 10 squeezes the corresponding squeezing column 9. The column 9 and the detection shell 8 are sealed and slidably connected to a follower disk 12. A fluid medium, which is selected as damping fluid, is stored between the extrusion disk 10 and the follower disk 12 in the detection shell 8. A second elastic element 11 is provided between the opposite sides of the extrusion disk 10 and the follower disk 12 and the detection shell 8. The second elastic element 11 is selected as a spring and is used to guide the extrusion disk 10 and the follower disk 12 to reset. The elastic coefficient of the second elastic element 11 is greater than the elastic coefficient of the first elastic element 7. A pressure sensing component for sensing the pressure inside the shell 1 is provided inside the detection shell 8.

[0025] See Figures 5 to 8 The pressure-sensing assembly includes: a pressure-sensing element 13, which is sealed and slidably connected to the corresponding detection housing 8. The pressure-sensing element 13 is formed by a round rod and a disc. The extrusion disc 10 and the following disc 12 are both sealed and slidably connected to the round rod of the pressure-sensing element 13. One end of the round rod of the pressure-sensing element 13 protrudes from the corresponding detection housing 8 near the axis of the housing 1. A third elastic element 14, which is a spring, is fixedly connected between the side of the pressure-sensing element 13 away from the axis of the housing 1 and the corresponding detection housing 8. A limiting protrusion 131 is provided on the detection housing 8 near the corresponding third elastic element 14. The limiting protrusion 131 is used to limit the extreme position of the corresponding pressure-sensing element 13. To prevent the third elastic element 14 from being over-compressed; when the extrusion disc 10 is in contact with the corresponding extrusion post 9, the minimum distance between the pressure sensing element 13 and the corresponding limiting protrusion 131 is equal to the minimum distance between the power disc 15 and the corresponding following disc 12, so that the pressure sensing element 13 will not interfere with the extrusion disc 10 and the following disc 12 within its movable range; the pressure sensing element 13 is fixedly connected to the power disc 15, which is located between the corresponding extrusion disc 10 and the corresponding following disc 12. The diameter of the power disc 15 is smaller than the inner diameter of the detection shell 8, that is, there is a gap between the periphery of the power disc 15 and the detection shell 8, and this gap is used for the flow of the fluid medium.

[0026] The above setup enables the pressure sensing element 13 to sense the pressure inside the housing 1. During periods of continuous pressure change or fluctuation, the pressure sensing element 13 moves frequently. Simultaneously, the pressure sensing element 13 uses the fluid medium to drive the extrusion plate 10 to move together, ensuring that the extrusion plate 10 is always misaligned with the corresponding extrusion column 9. This causes the wedge block 6 to limit the adjustment control 4, isolating the receiving cavity 301 from the internal space of the housing 1. When the pressure inside the housing 1 stabilizes, the pressure sensing element 13 stops moving, and the extrusion plate 10 slowly resets under the resistance of the second elastic element 11 and the fluid medium, releasing the wedge block 6 from limiting the adjustment control 4 and allowing the receiving cavity 301 to connect with the interior of the housing 1. This not only prevents the slips 3 from being accidentally anchored due to pressure during the well-running process, but also allows the receiving cavity 301 to be re-isolated after anchoring is completed, maintaining the fluid volume inside the receiving cavity 301 and thus ensuring the stability of the anchoring effect.

[0027] The principle of sensing pressure changes within the housing 1 by the movement of the pressure-sensing element 13 (the relevant paragraphs of this principle are attached). Figure 6 (Description based on the perspective of the main view): During the well-running process, the pressure inside the shell 1 continuously increases. Before the pressure inside the shell 1 increases to the point of overcoming the magnetic attraction between the magnetic ring 5 and the shell 1, the pressure sensing element 13 moves to the right under the combined action of the pressure and the third elastic element 14. During the movement of the pressure sensing element 13, it will drive the power disk 15 to move together. During the movement of the power disk 15, it will drive the extrusion disk 10 and the following disk 12 to move to the right through the fluid medium, and compress the second elastic element 11 on the right side, causing the extrusion disk 10 to be misaligned with the extrusion column 9. The extrusion column 9 and the wedge 6 move under the action of the first elastic element 7, causing the wedge 6 to insert into the limiting groove 601 and limit the adjustment control 4. In this way, the position of the adjustment control 4 is locked, isolating the internal space of the receiving cavity 301 from the internal space of the shell 1.

[0028] As the extrusion disc 10 and the follower disc 12 move to the right, they are constantly moving to the left relative to the power disc 15 under the elastic force of the second elastic element 11 on the right side. That is, the extrusion disc 10 and the follower disc 12 are always moving to their original positions. However, during the well run, the pressure inside the casing 1 is always unstable, which causes the power disc 15 to always move to the right and the extrusion disc 10 to always be misaligned with the extrusion column 9.

[0029] Before the filling operation begins, fluid is injected into the tubing to actively control the pressure inside the casing 1 to reach a certain value and maintain stability. This keeps the pressure-sensing element 13 stationary under the combined action of pressure and the third elastic element 14. The extrusion disc 10 and the following disc 12 slowly reset under the action of the second elastic element 11 and re-extrude the corresponding extrusion column 9, releasing the wedge block 6 from limiting the control control 4, thus connecting the receiving cavity 301 with the interior of the casing 1. In this way, the pressure change inside the casing 1 is monitored, and the pressure-sensing element 13 moves sensitively with the pressure change, driving the extrusion disc 10 to move, keeping the extrusion disc 10 and the extrusion column 9 misaligned until the pressure inside the casing 1 stabilizes and the pressure-sensing element 13 stops moving. Only after the extrusion disc 10 slowly resets can the receiving cavity 301 be connected with the interior of the casing 1, avoiding accidental anchoring during the filling tool's lowering into the well.

[0030] See Figures 3 to 7 A fixing member 16 is fixedly connected to the housing 1 near all the slips 3. The fixing member 16 is used to limit the extreme position of the corresponding adjustment control 4 and prevent the adjustment control 4 from slipping. The fixing member 16 is located in the corresponding receiving cavity 301. A damping cavity 161 is provided in the fixing member 16. The damping cavity 161 contains a fluid medium. The fluid medium is a damping liquid, which is used to impede the movement of the detection shell 8 in the damping cavity 161. The detection shell 8 is sealed and slidably connected to the corresponding fixing member 16. An annular expansion portion 801 is provided on the side of the detection shell 8 near the corresponding fixing member 16. The annular expansion portion 801 is sealed and slidably within the corresponding fixing member 16. A plurality of damping through holes 802 are provided on the annular expansion portion 801. The damping through holes 802 are used to supply the fluid medium.

[0031] The above setup enables the fluid in the receiving cavity 301 and the housing 1 to have sufficient time to flow after the receiving cavity 301 is connected to the housing 1 by using the liquid medium to impede the movement of the control control 4 and the detection shell 8.

[0032] Anchoring process during filling operation: After the casing 1 and working tubing string 2 are moved to the target position downhole, the pressure inside the casing 1 is increased to the specified pressure value (the specified value here directly determines the magnitude of the squeezing force of the slips 3 on the casing, which can be determined according to the actual situation) and kept stable. After a period of time, the squeezing disc 10 squeezes the corresponding squeezing column 9, releasing the wedge block 6 from limiting the control control 4. At this time, the control control 4 moves under the action of the pressure difference between the receiving cavity 301 and the inside of the casing 1, so that the periphery of the connecting hole 302 no longer blocks the control flow channel 402. At this time, the inside of the casing 1 is connected to the receiving cavity 301 through the external flow channel 401 and the control flow channel 402. The fluid inside the casing 1 enters the receiving cavity 301, pushing the slips 3 to move until anchoring is completed.

[0033] During the movement of the control unit 4, the control unit 4 drives the detection shell 8 to move together, causing the annular expansion part 801 to move within the damping cavity 161. The liquid medium in the damping cavity 161 passes through the damping through hole 802. After anchoring is completed, the slip 3 can no longer move. At this time, the pressure inside the shell 1 and the pressure inside the receiving cavity 301 gradually become consistent. The control unit 4 slowly resets under the magnetic force of the magnetic ring 5 and the resistance of the liquid medium in the damping cavity 161.

[0034] During the filling operation, the pressure inside the shell 1 is kept below the specified pressure value, and the pressure inside the receiving cavity 301 is kept above the pressure inside the shell 1. In this way, under the limiting action of the annular limiting part 403, the adjusting control 4 always remains in a blocking state of the connecting hole 302, thus preventing accidental anchoring failure during the filling operation.

[0035] When the filling operation is completed and the anchoring needs to be released, pressurize the housing 1 again to increase the pressure inside the housing 1 to the specified pressure value and stabilize it. Repeat the above steps to release the sealing of the connecting hole 302 by the adjusting control 4. Then, continuously reduce the pressure inside the housing 1 until the pressure inside the housing 1 is less than the annular pressure of the oil sleeve. A pressure difference will appear on the inner and outer sides of the slip 3. Under the action of this pressure difference, the slip 3 will contract into the receiving cavity 301, squeezing the fluid in the receiving cavity 301 into the housing 1. During the reset movement of the slip 3, the adjusting control 4 and the detection housing 8 will also slowly reset and move. After the slip 3 is reset, the adjusting control 4 will reset and reseal the connecting hole 302, thus realizing the release of the anchoring.

[0036] Example 2 This embodiment is a further optimization based on Embodiment 1.

[0037] The hydraulic anchor in the prior art consists of a main body, anchor claws, pressure plate and spring. The anchor claws can extend and retract by relying on the pressure difference between the inner and outer sides of the main body. The anchor claws are provided with protruding ridges on their sides. The pressure plate restricts the direction of the anchor claws and prevents them from rotating during extension and retraction, thereby ensuring that the protruding ridges on the surface of the anchor claws can fully contact the casing wall. However, due to the presence of the pressure plate, there is a gap between the anchor claws and the pressure plate. At the same time, during the extension and retraction of the anchor claws, the anchor claws will slide relative to the pressure plate. The existence of the gaps increases the probability of sand jamming.

[0038] See Figure 1 and Figure 2 The projection of the Kava 3 on its end face is elliptical.

[0039] The above settings can prevent the slip 3 from rotating by changing its shape, thereby preventing the slip 3 from deflecting and reducing the number of gaps during the extension and retraction of the slip 3, thus reducing the probability of sand jamming and improving the reliability of the anchoring operation.

[0040] Example 3 This embodiment is a further optimization based on embodiment 2.

[0041] See Figures 6 to 8 An elastic ring 17 is fixedly connected to the side of the annular expansion portion 801 near the axis of the housing 1. The elastic ring 17 is fixedly connected to the annular expansion portion 801 only on its outer periphery. The elastic ring 17 can be made of elastic rubber. The elastic ring 17 is used to block the adjacent damping through hole 802.

[0042] The above configuration enables the elastic ring 17 to block adjacent damping through holes 802, so that the number of fluid medium passing through the damping through holes 802 is different during the movement of the annular expansion portion 801 in two directions. This changes the magnitude of the resistance force experienced by the annular expansion portion 801 during its movement in two directions. During the movement of the adjusting control 4 as it releases the blockage of the connecting hole 302, the fluid medium can flow through all the damping through holes 802, reducing the force experienced by the annular expansion portion 801 and extending the service life of the detection shell 8.

[0043] Example 4 This embodiment is a further optimization based on embodiment 3.

[0044] See Figures 3 to 5 A fourth elastic element 18 is fixedly connected between the slip 3 and the corresponding fixing part 16. The fourth elastic element 18 is a tension spring. The fourth elastic element 18 is used to provide initial power for the reset movement of the slip 3 when the anchor is released. The slip 3 is provided with equidistantly distributed protrusions on the side away from the axis of the housing 1. An elastic strip 19 is fixedly connected between two adjacent protrusions on the slip 3. The elastic strip 19 is made of elastic rubber.

[0045] The above settings can achieve the following: relying on the convex edge of the slip 3 to enhance the anchoring effect, and after anchoring, the gap of the convex edge on the slip 3 is sealed by the elastic strip 19 to prevent the fluid in the annulus from contacting the convex edge side of the slip 3, thereby reducing the axial extrusion force exerted by the fluid in the annulus on the slip 3, and thus reducing the degree to which the extrusion force of the slip 3 on the casing changes due to the pressure change in the annulus.

[0046] The above description is only a preferred embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any equivalent substitutions or modifications made by those skilled in the art within the scope of the technology disclosed in the present invention, based on the technical solution and inventive concept of the present invention, should be covered within the scope of protection of the present invention.

Claims

1. A composite filling tool for oilfield downhole operations, comprising: A housing (1) is equipped with a working pipe string (2). The housing (1) is characterized by: uniformly distributed receiving cavities (301) on its periphery; a locking slip (3) is slidably connected within each receiving cavity (301); a connecting hole (302) is provided near each receiving cavity (301) within the housing (1), communicating with the corresponding receiving cavity (301); the connecting hole (302) connects the corresponding receiving cavity (301) to the interior of the housing (1); and an adjustment control (4) is slidably connected within the connecting hole (302), the adjustment control (4) being used to adjust the corresponding connecting hole. The hole (302) is sealed. A magnetic ring (5) is embedded in the adjustment control (4) near the position of the corresponding slip (3). The magnetic ring (5) is used to maintain the stability of the relative position between the adjustment control (4) and the housing (1). A wedge (6) is slidably connected to the position of the housing (1) near the adjustment control (4). A first elastic element (7) is fixed between the wedge (6) and the housing (1). A limiting groove (601) is provided on the adjustment control (4) to accommodate the corresponding wedge (6). A control mechanism is provided in the adjustment control (4) to adjust its limiting state with the corresponding wedge (6). The regulatory agencies include: The detection shell (8) is fixed to the corresponding adjustment control (4). The detection shell (8) is sealed and slidably connected to the extrusion column (9) near the position of the corresponding wedge (6). The extrusion column (9) is used to extrude the corresponding wedge (6). The detection shell (8) is sealed and slidably connected to the extrusion disk (10). The end of the extrusion column (9) near the corresponding extrusion disk (10) is hemispherical. The extrusion disk (10) is used to extrude the corresponding extrusion column (9). The detection shell (8) is sealed and slidably connected to the follower disk (12). A fluid medium is stored between the extrusion disk (10) and the follower disk (12) in the detection shell (8). A second elastic element (11) is provided between the opposite sides of the extrusion disk (10) and the follower disk (12) and the detection shell (8).

2. The composite filling tool for oilfield downhole operations according to claim 1, characterized in that: The control control (4) has an external flow channel (401) in the middle of the side near the axis of the housing (1). The control control (4) has a regulating flow channel (402) connected to the external flow channel (401) on its periphery. The blocking state of the control control (4) to the connecting hole (302) can be adjusted by changing the position of the control control (4). The control control (4) has an annular limiting part (403) on the side away from the axis of the housing (1). The annular limiting part (403) is used to limit the extreme position of the control control (4). The magnetic ring (5) is located in the corresponding annular limiting part (403). The detection housing (8) has a pressure sensing component for sensing the pressure inside the housing (1).

3. A composite filling tool for oilfield downhole operations according to claim 2, characterized in that: The pressure-sensing component includes: A pressure-sensing element (13) is slidably and sealed to the corresponding detection shell (8). The extrusion disc (10) and the following disc (12) are both slidably and sealed to the pressure-sensing element (13). One end of the pressure-sensing element (13) protrudes from the corresponding detection shell (8) near the axis of the shell (1). A third elastic element (14) is fixed between the side of the pressure-sensing element (13) away from the axis of the shell (1) and the corresponding detection shell (8). The detection shell (8) is close to the corresponding third elastic element (14). A limiting protrusion (131) is provided at the position, which is used to limit the extreme position of the corresponding pressure sensing element (13). The pressure sensing element (13) is fixedly connected to a power disk (15). The power disk (15) is located between the corresponding extrusion disk (10) and the corresponding follower disk (12). The diameter of the power disk (15) is smaller than the inner diameter of the detection shell (8), that is, there is a gap between the periphery of the power disk (15) and the detection shell (8), and this gap is used for the flow of the fluid medium.

4. A composite filling tool for oilfield downhole operations according to claim 3, characterized in that: in When the extrusion disc (10) is in contact with the corresponding extrusion post (9), the minimum distance between the pressure sensing element (13) and the corresponding limiting protrusion (131) is not greater than the minimum distance between the power disc (15) and the corresponding following disc (12).

5. A composite filling tool for oilfield downhole operations according to claim 1, characterized in that: The elastic coefficient of the second elastic element (11) is greater than that of the first elastic element (7).

6. A composite filling tool for oilfield downhole operations according to claim 3, characterized in that: A fixing member (16) is fixedly connected to the housing (1) near all the slips (3). The fixing member (16) is used to limit the extreme position of the corresponding adjustment control (4). The fixing member (16) is located in the corresponding receiving cavity (301). A damping cavity (161) is provided in the fixing member (16). The damping cavity (161) contains a fluid medium. The detection housing (8) is sealed and slidably connected to the corresponding fixing member (16). An annular expansion portion (801) is provided on the side of the detection housing (8) near the corresponding fixing member (16). The annular expansion portion (801) slides sealed within the corresponding fixing member (16). A plurality of damping through holes (802) are provided on the annular expansion portion (801). The damping through holes (802) are used to supply the fluid medium to flow.

7. A composite filling tool for oilfield downhole operations according to claim 6, characterized in that: The projection of the kava (3) on its end face is elliptical.

8. A composite filling tool for oilfield downhole operations according to claim 6, characterized in that: An elastic ring (17) is fixed to one side of the annular expansion portion (801) near the axis of the housing (1), and the elastic ring (17) is used to block the adjacent damping through hole (802).

9. A composite filling tool for oilfield downhole operations according to claim 8, characterized in that: A fourth elastic element (18) is fixedly connected between the slip (3) and the corresponding fixing element (16). The slip (3) has equidistantly distributed protrusions on the side away from the axis of the housing (1). An elastic strip (19) is fixedly connected between two adjacent protrusions on the slip (3).

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