Underground controllable self-expansion casing patching pipe
Through the physical extrusion mechanism of the piston rod and expansion block, controllable expansion subsidy for downhole pipelines is achieved, solving the safety and stability problems of the explosive expansion subsidy method, reducing repair costs and improving safety.
Patent Information
- Application Number
- CN202411664180.3
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2024-11-20
- Publication Date
- 2025-01-10
AI Technical Summary
Among the existing underground pipeline repair methods, the explosive expansion subsidy method has the risk of major safety accidents that are difficult to control energy, low safety and prone to cause oil well fire.
The physical extrusion mechanism of the piston rod and expansion block is adopted. Through the gradual injection of hydraulic oil and the rotation of the expansion pull rod, the controllable expansion of the expansion subtraction pipe is achieved and the damaged pipe is bonded to avoid explosive expansion.
The stability and controllability of downhole pipeline repair is achieved, the risk is reduced, and the cost of parts disengagement and repair is simplified through the design of limit blocks and slots.
Smart Images
Figure CN119288350A_ABST
Abstract
Description
Technical Field
[0001] The invention relates to the technical field of pipeline repair, in particular to an underground controllable self-expandable casing patching pipe, which realizes the controllable self-expandable casing patching pipe by physically squeezing and expanding the expansion patching pipe. Background Art
[0002] Downhole pipelines are often damaged, so they need to be repaired. Common methods of underground pipe patching include detonation patching, which involves using a metal seamless pipe with an outer diameter smaller than the inner diameter of the casing. This seamless pipe is placed inside the casing that needs to be patched. By detonating explosives or gunpowder in the seamless pipe, huge energy is released, causing the seamless pipe to undergo plastic deformation, thereby expanding and fitting to the inner wall of the casing to achieve the purpose of patching.
[0003] The common casing detonation patching method now is to place a metal seamless pipe with an outer diameter smaller than the inner diameter of the casing in the casing that needs to be patched, and use the huge energy released by the explosives or gunpowder during the explosion to expand the seamless pipe, and plastic deformation occurs to patch the inner wall of the casing; the disadvantage of this method is that the energy generated by the explosion is difficult to control, and too little energy cannot achieve the purpose of patching, while too much energy can cause deformation or damage to the casing; fire in oil wells is very dangerous and it is easy to cause major safety accidents such as oil well fires, so there is a need for a controllable downhole self-expanding casing patching pipe. Summary of the invention
[0004] The present invention provides an underground controllable self-expandable casing patching tube. Through the use of a piston rod and an expansion block, the expansion patching tube is only physically squeezed during use to make it fit with the damaged expansion patching tube, thereby achieving a patching effect and avoiding the danger and instability of the traditional method of relying on explosion to generate expansion force to expand the patching tube.
[0005] The technical solution of the present invention is as follows:
[0006] A controllable downhole self-expandable casing subsidizing pipe comprises: a piston expansion mechanism and an expansion subsidizing pipe, wherein the expansion subsidizing pipe is provided with a piston expansion mechanism, wherein the piston expansion mechanism comprises a piston rod provided in the expansion subsidizing pipe, wherein the expansion subsidizing pipe is slidably connected to the inner wall of the expansion subsidizing pipe, wherein the bottom of the piston rod is fixedly connected to a piston head, the top of the piston rod is evenly provided with protrusions, wherein the protrusions are fixedly connected to the top of the piston rod, and the bottom of the protrusions are rotatably connected to an expansion rod, wherein the bottom of the expansion rod is evenly provided with a fixing block, wherein the fixing block is fixedly connected to the bottom end of the expansion rod, and the top of the fixing block is fixedly connected to the expansion block, wherein the bottom of the inner side of the expansion subsidizing pipe is movably connected to a bottom plate, wherein the top of the bottom plate is fixedly connected to a piston wall, wherein the piston wall is located between the piston rod and the expansion rod, wherein the top of the fixing block is vertically provided with a through hole, wherein the top of the piston wall is fixedly connected to a limiting plate, wherein a plurality of movable grooves are horizontally provided on the inner side of the limiting plate, wherein the protrusions penetrate the movable grooves, and a track rod mechanism is provided between the limiting plate and the bottom plate.
[0007] Furthermore, the track rod mechanism consists of a first track rod, a second track rod and a third track rod, one end of the first track rod passes through a through hole and is fixedly connected to the base plate, and the distance between the top of the first track rod and the center of the base plate is greater than the distance between the bottom of the first track rod and the center of the base plate.
[0008] Furthermore, the top of the first track rod is fixedly connected to the second track rod, and the top of the second track rod is fixedly connected to the third track rod.
[0009] Furthermore, the top end of the third track rod is inclined, and the top end of the third track rod is fixedly connected to the bottom end of the limiting plate.
[0010] Furthermore, a plurality of limit blocks are evenly and fixedly connected to the bottom of the inner wall of the expansion patch tube, the limit blocks are symmetrically distributed on both sides of the bottom plate, and the limit blocks are all at the bottom of the second track rod.
[0011] Furthermore, a plurality of through slots are horizontally arranged on the edge of the bottom plate, and the through slots correspond one-to-one to the positions of the tops of the third track rods.
[0012] Furthermore, an oil filling pipe is fixedly connected to the top of the piston head, a connecting ring is fixedly connected to the top of the oil filling pipe, and a delivery pipe is fixedly connected to the top of the connecting ring.
[0013] Furthermore, a fixing ring is fixedly connected to the top end of the inner wall of the piston rod, and the oil filling pipe passes through the fixing ring.
[0014] Compared with the prior art, the present invention has the following beneficial effects:
[0015] 1. The present invention uses a piston rod and an expansion block. During use, the expansion patch tube is only physically squeezed to make it fit with the damaged expansion patch tube, thereby achieving a patching effect without the need for chemical reaction, greatly reducing the risk and ensuring stability and controllability.
[0016] 2. The present invention uses a limit block and a limit groove, so that after the expansion of the expansion patch pipe, the parts other than the expansion patch pipe can be easily separated from the pipeline, which greatly reduces the cost of pipeline patch repair. BRIEF DESCRIPTION OF THE DRAWINGS
[0017] Figure 1 It is a three-dimensional schematic diagram of the present invention;
[0018] Figure 2 It is a three-dimensional schematic diagram of the internal structure of the present invention;
[0019] Figure 3 The present invention Figure 2 A magnified schematic diagram of point A;
[0020] Figure 4 The present invention Figure 2 An enlarged schematic diagram of point B;
[0021] Figure 5 It is a three-dimensional schematic diagram of the internal parts of the present invention.
[0022] In the figure:
[0023] 1. Piston expansion mechanism; 2. Limit plate; 3. Expansion compensation tube; 4. Piston wall; 5. Piston rod; 6. Protrusion; 7. Delivery pipe; 8. Expansion pull rod; 9. Track rod mechanism; 10. Expansion block; 11. Limit block; 12. Through groove; 13. Piston head; 14. Oil filling pipe; 15. Bottom plate; 16. Connecting ring; 17. Fixed block; 18. Through hole; 19. First track rod; 20. Second track rod; 21. Third track rod; 22. Fixed ring. DETAILED DESCRIPTION
[0024] The following embodiments of the present invention are described in further detail in conjunction with the accompanying drawings and examples. The following examples are used to illustrate the present invention, but are not intended to limit the scope of the present invention.
[0025] A controllable downhole self-expandable casing patching pipe, comprising: a piston expansion mechanism 1 and an expansion patching pipe 3, wherein the expansion patching pipe 3 is provided with the piston expansion mechanism 1, wherein the piston expansion mechanism 1 comprises a piston rod 5 provided in the expansion patching pipe 3, wherein the bottom of the piston rod 5 is fixedly connected with a piston head 13, wherein the top of the piston rod 5 is evenly provided with protrusions 6, wherein the protrusions 6 are fixedly connected with the top of the piston rod 5, wherein the bottom of the protrusions 6 is rotatably connected with an expansion rod 8, wherein the bottom of the expansion rod 8 is evenly provided with a fixing block 17, wherein the fixing block 17 It is fixedly connected to the bottom end of the expansion rod 8, the top of the fixed block 17 is fixedly connected to the expansion block 10, the bottom of the inner side of the expansion patch tube 3 is movably connected to the bottom plate 15, the top of the bottom plate 15 is fixedly connected to the piston wall 4, the piston wall 4 is located between the piston rod 5 and the expansion rod 8, the top of the fixed block 17 is vertically opened with a through hole 18, the top of the piston wall 4 is fixedly connected to the limit plate 2, the inner side of the limit plate 2 is horizontally provided with a plurality of movable grooves, the protrusion 6 passes through the movable grooves, and a track rod mechanism 9 is arranged between the limit plate 2 and the bottom plate 15.
[0026] Among them, the track rod mechanism 9 is composed of a first track rod 19, a second track rod 20 and a third track rod 21. One end of the first track rod 19 passes through the through hole 18 and is fixedly connected to the bottom plate 15. The distance between the top of the first track rod 19 and the center of the bottom plate 15 is greater than the distance between the bottom of the first track rod 19 and the center of the bottom plate 15.
[0027] The top of the first track rod 19 is fixedly connected to the second track rod 20 , and the top of the second track rod 20 is fixedly connected to the third track rod 21 .
[0028] The top end of the third track rod 21 is inclined, and the top end of the third track rod 21 is fixedly connected to the bottom of the limiting plate 2 .
[0029] Among them, a plurality of limit blocks 11 are evenly and fixedly connected to the bottom of the inner wall of the expansion patch tube 3 , and the limit blocks 11 are symmetrically distributed on both sides of the bottom plate 15 , and the limit blocks 11 are all at the bottom of the second track rod 20 .
[0030] A plurality of through slots 12 are horizontally arranged at the edge of the bottom plate 15 , and the through slots 12 correspond to the positions of the tops of the third track rods 21 one by one.
[0031] The top of the piston head 13 is fixedly connected with an oil filling pipe 14 , the top of the oil filling pipe 14 is fixedly connected with a connecting ring 16 , and the top of the connecting ring 16 is fixedly connected with a delivery pipe 7 .
[0032] A fixing ring 22 is fixedly connected to the top of the inner wall of the piston rod 5 , and the oil filling pipe 14 passes through the fixing ring 22 .
[0033] Embodiment 1: Figure 1-5 As shown, firstly, the device is placed in the pipeline or well to be repaired, and the delivery pipe 7 is extended to the repaired pipeline or wellhead, so that the expansion patch pipe 3 is at the repairing position, and the delivery pipe 7 is continuously and slowly injected with hydraulic oil. The hydraulic oil enters the oil injection pipe 14 through the connecting ring 16 fixedly connected to the delivery pipe 7, and then flows to between the piston head 13 and the bottom plate 15 through the oil injection pipe 14. With the continuous injection of hydraulic oil, the hydraulic oil between the piston head 13 and the bottom plate 15 gradually increases, so that the liquid level of the hydraulic oil rises, so that the hydraulic oil pushes the piston head 13 to move, and then the piston head 13 drives the movable body fixedly connected to its top The plug rod 5 moves along the piston wall 4 toward the top of the piston wall 4, and the piston rod 5 drives a number of protrusions 6 fixedly connected to its top to move upward. The protrusion 6 pulls the expansion rod 8 rotatably connected to it to move upward. The expansion rod 8 moves in the movable groove in the limit plate 2. The expansion rod 8 moves upward and drives the fixed block 17 horizontally arranged at its bottom to move. The fixed block 17 drives the expansion block 10 fixedly connected to its top to move. When the fixed block 17 moves upward, it is affected by the track rod mechanism 9 fixedly connected between the bottom plate 15 and the limit plate 2. The fixed block 17 slides upward along the surface of the track rod mechanism 9 through the through hole 18 vertically opened at its top.
[0034] When the fixed block 17 slides upward on the surface of the first track rod 19, the fixed block 17 drives the expansion block 10 to expand outward, and the expansion pull rod 8 rotates on the protrusion 6 until the fixed block 17 reaches the top of the first track rod 19. At this time, the expansion block 10 has begun to squeeze the expansion subsidy tube 3, and the fixed block 17 continues to move upward to the second track rod 20 fixedly connected to the first track rod 19. The fixed block 17 is restricted by the second track rod 20 to move vertically upward, and at the same time, the expansion subsidy tube 3 is expanded until it moves to the top of the second track rod 20. The fixed block 17 leaves the second track rod 20 and slides to the third track rod 21 fixedly connected to the top of the second track rod 20. The top of the third track rod 21 is in an inclined state, and the fixed block 17 It starts to move on the surface of the third track rod 21, and is restricted by the third track rod 21. The fixed block 17 and the expansion block 10 are squeezed with the expansion subsidy tube 3. The fixed block 17 and the expansion block 10 cannot rotate with the expansion subsidy tube 3, and the track rod mechanism 9 rotates, thereby rotating the track rod mechanism 9, the bottom plate 15, the piston wall 4 and the limit block 11 until the multiple through grooves 12 horizontally arranged on the bottom plate 15 correspond to the positions of the top of the third track rod 21, and at the same time, the limit blocks 11 arranged on the bottom of the inner wall of the expansion subsidy tube 3 correspond to the corresponding through grooves 12 positions. Pull the conveying pipe 7, the limit block 11 passes through the through hole 18, and the device can be detached from the expansion subsidy tube 3, leaving the expansion subsidy tube 3 on the repaired pipe wall and leaving the well.
[0035] The hydraulic oil is pumped out through the delivery pipe 7, and the device can be restored to its initial state, and then a new expansion compensation tube 3 is inserted into the outer side of the track rod mechanism 9, and the limit block 11 at the bottom of the new expansion compensation tube 3 passes through the through groove 12 of the bottom plate 15, so that the bottom plate is located between the limit blocks, and then the expansion compensation tube 3 is rotated until the limit block 11 is located below the second track rod 20, and then it can be used again.
[0036] The embodiments of the present invention are provided for the purpose of illustration and description. Although the embodiments of the present invention have been shown and described above, it can be understood that the above embodiments are exemplary and cannot be understood as limitations of the present invention. Ordinary technicians in this field can change, modify, replace and modify the above embodiments within the scope of the present invention.
Claims
1. A downhole controllable self-expandable casing patching pipe, comprising: A piston expansion mechanism (1) and an expansion compensation tube (3), characterized in that: the expansion compensation tube (3) is provided with a piston expansion mechanism (1), the piston expansion mechanism (1) comprises a piston rod (5) provided in the expansion compensation tube (3), the bottom of the piston rod (5) is fixedly connected to a piston head (13), the top of the piston rod (5) is evenly provided with protrusions (6), the protrusions (6) are fixedly connected to the top of the piston rod (5), the bottom of the protrusions (6) are rotatably connected to an expansion rod (8), the bottom of the expansion rod (8) is evenly provided with a fixing block (17), the fixing block (17) is connected to the expansion rod (8), and the fixing block (17) is connected to the expansion rod (8). ) is fixedly connected to the bottom end, the top of the fixed block (17) is fixedly connected to an expansion block (10), the bottom of the inner side of the expansion compensation tube (3) is movably connected to a bottom plate (15), the top of the bottom plate (15) is fixedly connected to a piston wall (4), the piston wall (4) is located between the piston rod (5) and the expansion pull rod (8), the top of the fixed block (17) is vertically opened with a through hole (18), the top of the piston wall (4) is fixedly connected to a limit plate (2), the inner side of the limit plate (2) is horizontally provided with a plurality of movable grooves, the protrusions (6) penetrate the movable grooves, and a track rod mechanism (9) is provided between the limit plate (2) and the bottom plate (15).
2. The downhole controllable self-expandable casing patching pipe according to claim 1, characterized in that: The track rod mechanism (9) is composed of a first track rod (19), a second track rod (20) and a third track rod (21); one end of the first track rod (19) passes through the through hole (18) and is fixedly connected to the bottom plate (15); the distance between the top of the first track rod (19) and the center of the bottom plate (15) is greater than the distance between the bottom of the first track rod (19) and the center of the bottom plate (15).
3. The downhole controllable self-expandable casing patching pipe according to claim 2, characterized in that: The top of the first track rod (19) is fixedly connected to a second track rod (20), and the top of the second track rod (20) is fixedly connected to a third track rod (21).
4. The downhole controllable self-expandable casing patching pipe according to claim 3, characterized in that: The top end of the third track rod (21) is inclined, and the top end of the third track rod (21) is fixedly connected to the bottom end of the limiting plate (2).
5. The downhole controllable self-expandable casing patching pipe according to claim 4, characterized in that: A plurality of limit blocks (11) are evenly and fixedly connected to the bottom of the inner wall of the expansion patch tube (3); the limit blocks (11) are symmetrically distributed on both sides of the bottom plate (15), and the limit blocks (11) are all located at the bottom of the second track rod (20).
6. The downhole controllable self-expandable casing patching pipe according to claim 1, characterized in that: A plurality of through slots (12) are horizontally arranged on the edge of the bottom plate (15), and the through slots (12) correspond one-to-one to the positions of the tops of the third track rods (21).
7. The downhole controllable self-expandable casing patching pipe according to claim 1, characterized in that: The top of the piston head (13) is fixedly connected to an oil injection pipe (14), the top of the oil injection pipe (14) is fixedly connected to a connecting ring (16), and the top of the connecting ring (16) is fixedly connected to a delivery pipe (7).
8. The downhole controllable self-expandable casing patching pipe according to claim 7, characterized in that: A fixing ring (22) is fixedly connected to the top end of the inner wall of the piston rod (5), and the oil injection pipe (14) passes through the fixing ring (22).