A self-locking hydraulic anchor for oil well fracturing and acidizing

Abstract

The present invention provides a self-locking hydraulic anchor for oil well fracturing and acidizing, which relates to the technical field of hydraulic anchors and includes an anchor body, wherein the anchor body includes connecting ends at both ends, a plurality of through grooves are provided on the peripheral side of the anchor body, a mounting seat is slidably fitted in the through grooves, an anchor head is provided on one side of the mounting seat, a connecting structure is provided between the mounting seat and the anchor head, a friction structure is provided on the anchor head, the friction structure corresponds to the connecting structure, the friction structure includes a plurality of friction blocks, an auxiliary friction structure is provided in the friction block, a first slide groove is provided in the through groove, the first slide groove corresponds to the mounting seat. In the present invention, a connecting structure is provided between the mounting seat and the anchor head, a friction structure is provided on the anchor head, and an auxiliary friction structure is provided in the friction block, so that the friction between the anchor head and the inner wall of the pipe can be increased by the friction structure, and after the friction structure is worn, the friction block can be used to assist in friction, thereby ensuring the stability of the device.

Description

Technical Field

[0001] The invention relates to the technical field of hydraulic anchors, in particular to a self-locking hydraulic anchor used for oil well fracturing and acidizing. Background Art

[0002] Hydraulic anchors, through the pressure built up in the tubing, cause the anchor claws, evenly distributed around the circumference of the anchor body, to extend outwards under the hydraulic pressure generated by the internal and external pressure differential. The anchor teeth on the outer surfaces of the anchor claws then embed into the casing wall, limiting the tool's up and down movement and achieving anchoring. Once the pressure differential is eliminated, the anchor claws return to their original position under the elastic force of the internal spring between the baffle and the anchor claws, releasing the anchor. However, existing hydraulic anchors often have the following disadvantages:

[0003] (1) When fracturing and acidizing oil wells, hydraulic anchors are often needed to eliminate the pressure difference in the oil well. However, the hydraulic anchors on the market can eliminate the pressure difference by themselves and cannot be manually intervened, resulting in blockage in the structure of the hydraulic anchor;

[0004] (2) After long-term use, the anchor teeth of the existing anchoring structure will gradually become smooth due to friction, which will lead to a decrease in the overall anchoring effect of the device, causing the pipeline to shake, thereby affecting the anchoring effect;

[0005] (3) During maintenance, the entire anchoring structure needs to be replaced, which makes the maintenance cost of the device high.

[0006] To this end, the present invention provides a self-locking hydraulic anchor for oil well fracturing and acidizing. Summary of the Invention

[0007] In view of the shortcomings of the prior art, the purpose of the present invention is to provide a self-locking hydraulic anchor for oil well fracturing and acidizing to solve the problems raised in the above-mentioned background technology. The present invention can increase the friction between the anchor head and the inner wall of the pipe through a friction structure, and after the friction structure is worn, the friction can be assisted by a friction block to ensure the stability of the device, and the anchor head can be disassembled and replaced through the connecting structure, and the anchor head can be replaced individually to reduce the replacement cost; the position of the anchor head can be locked by the locking structure, so that the anchor head is not affected by the pressure at this time, so that the anchoring effect can be maintained continuously to ensure the stability of the device; the anchor head can be driven to reset by the reset structure, and the stability of the anchor head when the pressure is unstable can be improved by the stabilizing structure, thereby ensuring the anchoring effect of the device.

[0008] In order to achieve the above-mentioned purpose, the present invention is implemented through the following technical solutions: a self-locking hydraulic anchor for oil well fracturing and acidizing, comprising an anchor body, the anchor body comprising connecting ends at both ends, a plurality of through grooves provided on the peripheral side of the anchor body, a mounting seat slidingly fitted in the through grooves, an anchor head provided on one side of the mounting seat, a connecting structure provided between the mounting seat and the anchor head, a friction structure provided on the anchor head, the friction structure corresponding to the connecting structure, the friction structure comprising a plurality of friction blocks, an auxiliary friction structure provided in the friction blocks, a first slide groove provided in the through groove, the first slide groove corresponding to the mounting seat, a locking structure provided in the anchor body, the locking structure corresponding to the mounting seat, a sealing structure, a reset structure and a stabilizing structure provided between the first slide groove and the mounting seat.

[0009] Furthermore, the mounting seat includes a slide plate and a connecting seat, the slide plate corresponds to the first slide groove, the connecting seat corresponds to the connecting structure and the anchor head, the reset structure includes a first spring fixed between the slide plate and the groove wall of the first slide groove, a sealing gasket is fixed in the first slide groove, and a first sealing ring is installed between the connecting seat and the groove wall of the through groove.

[0010] Furthermore, the sealing structure includes a sealing plate fixed between the slide plate and the groove wall of the first slide groove, the sealing plate includes a first plate body and a second plate body, the first plate body is fixedly connected to the groove wall of the first slide groove, the second plate body is fixedly connected to the slide plate, a second slide groove is opened in the first plate body, and the second slide groove is slidably connected to the second plate body.

[0011] Furthermore, a first piston is fixed to the end of the second plate body, a second spring is fixed between the first piston and the groove wall of the second sliding groove, a second sealing ring is fixed in the second sliding groove, and the second plate body corresponds to the second sealing ring.

[0012] Furthermore, the stabilizing structure includes a telescopic rod fixed between the first slide groove and the slide plate, a first connecting port is opened in the first slide groove, an electric valve is installed in the first connecting port, the telescopic rod includes a first rod body and a second rod body, the first rod body is fixedly connected to the groove wall of the first slide groove, the second rod body is fixedly connected to the slide plate, a third slide groove is opened in the first rod body, the third slide groove corresponds to the second rod body, a second piston is fixed to the end of the second rod body, the second piston is slidably connected to the third slide groove, a second connecting port is opened in the third slide groove, and the second connecting port is connected to the first connecting port.

[0013] Furthermore, the locking structure includes multiple insertion rods, multiple first slots are opened on the peripheral side of the skateboard, the first slots correspond to the insertion rods, multiple first grooves are opened on the peripheral side of the first slide groove, and a slider is slidably fitted in the first groove, and the slider is fixedly connected to the insertion rods.

[0014] Furthermore, a third spring is fixed between the slider and the groove wall of the first groove, an electromagnet is fixed at the top of the first groove, the slider is made of iron material, and the electromagnet corresponds to the slider.

[0015] Furthermore, the connection structure includes an insert block, which is fixedly connected to the connecting seat. A second slot is opened in the anchor head, and the second slot corresponds to the insert block. The friction block located in the middle is rotatably connected to the anchor head. A screw is fixed on the friction block located in the middle, and the screw is threadedly matched with the insert block. The other friction blocks are fixedly connected to the anchor head.

[0016] Furthermore, a plurality of first card blocks are fixed on the plug block, a plurality of first card slots are opened in the second slot, and the first card slots correspond to the first card blocks; a plurality of second card blocks are fixed on the connecting seat, and a plurality of second card slots are opened in the anchor head, and the second card slots correspond to the second card blocks.

[0017] Furthermore, the auxiliary friction structure includes an auxiliary block, a second groove is defined in the friction block, the auxiliary block is located in the second groove, and a fourth spring is fixed between the auxiliary block and the groove wall of the second groove.

[0018] Beneficial effects of the present invention:

[0019] 1. A connecting structure is installed between the mounting seat and the anchor head, a friction structure is installed on the anchor head, and an auxiliary friction structure is installed in the friction block. The friction structure can increase the friction between the anchor head and the inner wall of the pipe. After the friction structure is worn, the friction block can be used to assist in friction to ensure the stability of the device. The anchor head can be disassembled and replaced through the connecting structure, and the anchor head can be replaced separately, which reduces the replacement cost and is relatively simple to replace, thereby improving the efficiency of maintenance and replacement.

[0020] 2. A first slide groove is opened in the through groove, a locking structure is installed in the anchor body, a sealing gasket is installed in the first slide groove, and a first sealing ring is installed between the connecting seat and the groove wall of the through groove, which can ensure the sealing effect of the device and lock the position of the anchor head through the locking structure. At this time, the anchor head is not affected by the pressure, so that the anchoring effect can be maintained continuously to ensure the stability of the device.

[0021] 3. A sealing structure, a reset structure and a stabilizing structure are installed between the first slide groove and the mounting seat. The sealing structure can ensure the sealing of the device, thereby preventing the anchor head from getting stuck and ensuring smooth sliding of the anchor head. The first slide groove can limit the sliding range of the anchor head. The sliding plate can also be buffered by the sealing gasket to prevent the sliding plate from hitting the groove wall of the first slide groove after being subjected to greater pressure, thereby extending the service life of the device, preventing the anchor head from completely sliding out, and ensuring that the anchor head can be used normally. At the same time, the reset structure can drive the anchor head to reset, and the stabilizing structure can improve the stability of the anchor head when the pressure is unstable, thereby ensuring the anchoring effect of the device. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 This is a schematic diagram of the assembled three-dimensional structure of a self-locking hydraulic anchor for oil well fracturing and acidizing according to the present invention;

[0023] Figure 2 This is a schematic diagram of the assembly cross-sectional structure of a self-locking hydraulic anchor for oil well fracturing and acidizing according to the present invention;

[0024] Figure 3 This is a schematic diagram of the assembly cross-sectional structure of an anchor body and a mounting seat in a self-locking hydraulic anchor for oil well fracturing and acidizing according to the present invention;

[0025] Figure 4 This is a schematic diagram of the assembly cross-sectional structure of a mounting seat in a self-locking hydraulic anchor for oil well fracturing and acidizing according to the present invention;

[0026] Figure 5 for Figure 4 Schematic diagram at A in the middle;

[0027] Figure 6 for Figure 4 Schematic diagram at point B in the middle;

[0028] Figure 7 for Figure 4 Schematic diagram at C in the middle;

[0029] Figure 8 This is an exploded view of the mounting seat and anchor head of a self-locking hydraulic anchor for oil well fracturing and acidizing according to the present invention;

[0030] Figure 9 This is a schematic diagram of the assembled three-dimensional structure of a slide plate in a self-locking hydraulic anchor for oil well fracturing and acidizing according to the present invention;

[0031] Figure 10 This is a schematic diagram of the assembly cross-sectional structure of a slide plate and an insert in a self-locking hydraulic anchor for oil well fracturing and acidizing according to the present invention;

[0032] In the figure: 1, anchor body; 2, connecting end; 3, through groove; 4, first slide groove; 5, mounting seat; 6, first spring; 7, first sealing ring; 8, sealing gasket; 9, sealing plate; 10, first plate body; 11, second plate body; 12, first piston; 13, second spring; 14, second sealing ring; 15, second slide groove; 16, telescopic rod; 17, first connecting port; 18, second connecting port; 19, first rod body; 20, second rod body; 21, second piston; 2 2. Electric valve; 23. Slide plate; 24. Connecting seat; 25. First groove; 26. Third spring; 27. Slider; 28. Rod; 29. ​​First slot; 30. Electromagnet; 31. Anchor head; 32. Friction block; 33. Second groove; 34. Fourth spring; 35. Auxiliary block; 36. Screw; 37. First clamping block; 38. First clamping slot; 39. Insert block; 40. Second slot; 41. Second clamping block; 42. Second clamping slot; 43. Third slide slot. DETAILED DESCRIPTION

[0033] In order to make the technical means, creative features, objectives and effects achieved by the present invention easier to understand, the present invention is further described below in conjunction with specific implementation methods.

[0034] See also Figures 1 to 10 The present invention provides a technical solution: a self-locking hydraulic anchor for oil well fracturing and acidizing, comprising an anchor body 1, wherein the anchor body 1 includes connecting ends 2 at both ends, a plurality of through grooves 3 are opened on the circumferential side of the anchor body 1, a mounting seat 5 is slidably fitted in the through grooves 3, an anchor head 31 is installed on one side of the mounting seat 5, a connecting structure is installed between the mounting seat 5 and the anchor head 31, a friction structure is installed on the anchor head 31, the friction structure corresponds to the connecting structure, the friction structure includes a plurality of friction blocks 32, an auxiliary friction structure is installed in the friction block 32, a first slide groove 4 is opened in the through groove 3, the first slide groove 4 corresponds to the mounting seat 5, a locking structure is installed in the anchor body 1, the locking structure corresponds to the mounting seat 5, and a sealing structure, a reset structure and a stabilizing structure are installed between the first slide groove 4 and the mounting seat 5.

[0035] In this embodiment, the mounting seat 5 includes a slide plate 23 and a connecting seat 24. The slide plate 23 corresponds to the first slide groove 4, and the connecting seat 24 corresponds to the connecting structure and the anchor head 31. The reset structure includes a plurality of first springs 6 fixed between the slide plate 23 and the groove wall of the first slide groove 4. The two ends of the first spring 6 are respectively fixedly connected to the slide plate 23 and the groove wall of the first slide groove 4. A sealing gasket 8 is fixed in the first slide groove 4, and a first sealing ring 7 is installed between the connecting seat 24 and the groove wall of the through groove 3.

[0036] Specifically, the device is inserted into the oil well pipeline. When the fluid pressure inside the anchor body 1 increases, the larger pressure squeezes the mounting seat 5 toward the relative outside, thereby driving the anchor head 31 to slide relatively toward the outside, and the first spring 6 is stretched, so that the friction block 32 on the anchor head 31 contacts the inner wall of the pipeline, so that anchoring can be performed. When the internal pressure decreases, the mounting seat 5 is no longer pushed, so that the first spring 6 rebounds, thereby driving the mounting seat 5 to reset, so that the mounting seat 5 drives the friction block 32 away from the inner wall of the pipeline, so that there is no more friction between the friction block 32 and the pipeline, and thus it no longer plays an anchoring role. During the anchoring process, the sealing gasket 8 and the first sealing ring 7 can play a double sealing effect, and when the slide plate 23 slides, the sealing gasket 8 can cushion the slide plate 23 to prevent the slide plate 23 from directly hitting the groove wall of the first slide groove 4, thereby extending the service life of the device.

[0037] The sealing structure includes a sealing plate 9 fixed between the slide 23 and the groove wall of the first slide groove 4. The sealing plate 9 is an annular structure. The first spring 6 is located on one side of the sealing plate 9. The two ends of the sealing plate 9 are respectively fixedly connected to the slide 23 and the groove wall of the first slide groove 4. The sealing plate 9 includes a first plate body 10 and a second plate body 11. The first plate body 10 is fixedly connected to the groove wall of the first slide groove 4, and the second plate body 11 is fixedly connected to the slide 23. A second slide groove 15 is opened in the first plate body 10, and the second slide groove 15 is slidably connected to the second plate body 11. A first piston 12 is fixed to the end of the second plate body 11, and a second spring 13 is fixed between the first piston 12 and the groove wall of the second slide groove 15. A second sealing ring 14 is fixed in the second slide groove 15, and the second plate body 11 corresponds to the second sealing ring 14.

[0038] Specifically, when the slide plate 23 slides, the slide plate 23 will drive the second plate body 11 to slide together, and the second plate body 11 will slide in the second slide groove 15. The second plate body 11 drives the first piston 12 to slide in the second slide groove 15. The second sealing ring 14 can ensure the sealing between the first plate body 10 and the second plate body 11. The second spring 13 is stretched, so that the sealing of the first slide groove 4 can be guaranteed at this time, so that the sliding of the slide plate 23 will not be restricted, thereby preventing the anchor head 31 from getting stuck, ensuring that the anchor head 31 can be smoothly reset, and when the anchor head 31 is reset, the first spring 6 and the second spring 13 rebound at the same time, which can ensure that the anchor head 31 can be reset relatively smoothly. At this time, a larger pulling force can be applied by the second spring 13, thereby ensuring the smooth reset of the anchor head 31.

[0039] The stabilizing structure includes a plurality of telescopic rods 16 fixed between the first chute 4 and the slide plate 23. The telescopic rods 16 and the first springs 6 are alternately arranged, and the plurality of telescopic rods 16 and the plurality of first springs 6 are respectively located on the peripheral side of the sealing plate 9. The side of the sealing plate 9 close to the through groove 3 is the relatively outer side of the sealing plate 9, and the side of the sealing plate 9 close to the groove wall of the first chute 4 is the relatively inner side of the sealing plate 9. The first spring 6 and the telescopic rods 16 are both located on the relatively inner side of the sealing plate 9. A first connecting port 17 is opened in the first chute 4. An electric valve 22 is installed, and the telescopic rod 16 includes a first rod body 19 and a second rod body 20. The first rod body 19 is fixedly connected to the groove wall of the first slide groove 4, and the second rod body 20 is fixedly connected to the slide plate 23. A third slide groove 43 is opened in the first rod body 19, and the third slide groove 43 corresponds to the second rod body 20. A second piston 21 is fixed to the end of the second rod body 20, and the second piston 21 is slidably connected to the third slide groove 43. A second connecting port 18 is opened in the third slide groove 43, and the second connecting port 18 is connected to the first connecting port 17.

[0040] Specifically, when the pressure of the fluid in the anchor body 1 is unstable, the unstable pressure pushes the slide plate 23, which makes the friction between the friction block 32 and the pipe unstable, thereby affecting the anchoring effect. The electric valve 22 is in a normally open state. When the pressure is unstable, the electric valve 22 is closed under a high pressure state, so that fluid remains in the third chute 43. After the electric valve 22 is closed, even if the external pressure changes, the pressure of the fluid in the third chute 43 remains unchanged. Therefore, the second rod body 20 can be pushed by the pressure of the fluid in the third chute 43, so that the second rod body 20 pushes and squeezes the slide plate 23, thereby ensuring the sliding The stability of the plate 23 is ensured, thereby ensuring the overall anchoring effect of the device; when the external pressure is stable, the electric valve 22 is in a normally open state, and the pressure in the third slide groove 43 is the same as that outside. The pressure pushes the slide plate 23 to slide, and the second piston 21 is pushed by the pressure. When the external pressure decreases, the slide plate 23 is reset, and the second piston 21 pushes out the fluid in the third slide groove 43, so as not to limit the sliding of the slide plate 23. While ensuring the anchoring stability of the device, it will not affect the device under normal conditions, so that the device has a self-locking effect when the pressure is unstable, ensuring the anchoring effect of the device, thereby ensuring the stability of the device.

[0041] The locking structure includes multiple insertion rods 28, and multiple first slots 29 are opened on the peripheral side of the slide plate 23. The first slots 29 correspond to the insertion rods 28. Multiple first grooves 25 are opened on the peripheral side of the first slide groove 4. A slider 27 is slidably fitted in the first groove 25. The slider 27 is fixedly connected to the insertion rods 28. A third spring 26 is fixed between the slider 27 and the groove wall of the first groove 25. An electromagnet 30 is fixed on the top of the first groove 25. The slider 27 is made of iron material and the electromagnet 30 corresponds to the slider 27.

[0042] Specifically, the electromagnet 30 is energized, so that the electromagnet 30 attracts the slider 27, so that the slider 27 slides upward relatively, and the third spring 26 is stretched at this time. At this time, the slider 27 drives the rod 28 to be inserted into the first slot 29, thereby limiting the slide plate 23. At this time, the external pressure will not affect the sliding of the slide plate 23, thereby achieving the locking of the device, and manually controlling whether the device is anchored to improve the flexibility of the device. When the device needs to be anchored, the electromagnet 30 is de-energized, so that the third spring 26 rebounds, thereby driving the slider 27 to reset, thereby separating the rod 28 from the first slot 29, and the rod 28 no longer limits the slide plate 23, so that the external pressure can drive the slide plate 23 to slide, so that the device can be controlled to be anchored. After anchoring, multiple electromagnets 30 on one side are energized, and the position of the slide plate 23 can be fixed, thereby locking the anchoring and ensuring the anchoring effect.

[0043] The connecting structure includes an insert block 39, which is fixedly connected to the connecting seat 24, a second slot 40 is provided in the anchor head 31, and the second slot 40 corresponds to the insert block 39, the friction block 32 located in the middle is rotatably connected to the anchor head 31, a screw 36 is fixed on the friction block 32 located in the middle, the screw 36 is threadedly engaged with the insert block 39, and the other friction blocks 32 are fixedly connected to the anchor head 31, a plurality of first clamping blocks 37 are fixed on the insert block 39, a plurality of first clamping grooves 38 are provided in the second slot 40, and the first clamping grooves 38 correspond to the first clamping blocks 37, a plurality of second clamping blocks 41 are fixed on the connecting seat 24, a plurality of second clamping grooves 42 are provided in the anchor head 31, and the second clamping groove 42 corresponds to the second clamping block 41, the auxiliary friction structure includes an auxiliary block 35, a second groove 33 is provided in the friction block 32, the auxiliary block 35 is located in the second groove 33, and a fourth spring 34 is fixed between the auxiliary block 35 and the groove wall of the second groove 33.

[0044] Specifically, the friction block 32 contacts the inner wall of the pipe and generates greater friction, thereby anchoring. When used for a long time, the surface of the friction block 32 is worn, the surface of the friction block 32 becomes thinner, and the anchoring effect becomes worse, until the friction block 32 becomes thinner to a certain extent. At this time, the surface of the friction block 32 is not enough to block the rebound force of the fourth spring 34, so that the fourth spring 34 rebounds and pushes the auxiliary block 35 out. The auxiliary block 35 is a conical structure or a columnar structure with rough friction lines on the end, so that the auxiliary block 35 contacts the inner wall of the pipe, thereby temporarily increasing friction, playing a better anchoring effect of the device, preventing the device from shaking, ensuring the stability of the device, and extending the service life of the device, preventing the device from losing its anchoring effect the moment the friction block 32 is worn, thereby ensuring safety, and there is no need to replace the anchor due to the loss of several friction blocks 32. The auxiliary block 35 can also be used to judge the wear of the friction block 32 by whether the auxiliary block 35 is pushed out and the number of times it is pushed out, thereby judging the service life of the anchor head 31, so that the anchor head 31 can be replaced in time to prevent the anchor head 31 from being damaged during use and causing pipeline instability, thereby improving the efficiency of maintenance; when the auxiliary block 35 located in the middle friction block 32 is pushed out, the screw 36 is threadedly fixed to the insert block 39, thereby ensuring that the anchor head 31 will not separate from the connecting seat 24, the auxiliary block 35 can have a good friction effect, and the friction between the friction block 32 and the auxiliary block 35 and the pipe wall can prevent the screw 36 from rotating and causing unstable installation. When the auxiliary block 35 is pushed out, there is a certain gap between the auxiliary block 35 and the second groove 33, so the auxiliary block 35 can produce a certain displacement, which can have a certain buffering effect and ensure the stability of the device.

[0045] When the anchor head 31 needs to be replaced, the friction block 32 located in the middle is rotated to rotate the friction block 32, thereby driving the screw 36 to rotate, and the screw 36 can be taken out. Then the anchor head 31 is pulled, so that the first clamping groove 38 and the first clamping block 37 lose their clamping relationship, and the second clamping groove 42 and the second clamping block 41 lose their clamping relationship, and the insert block 39 is pulled out from the second slot 40, thereby realizing the disassembly of the anchor head 31 and replacing the anchor head 31 without replacing the entire device, thereby reducing the maintenance cost of the device.

[0046] Working process: insert the device into the oil well pipeline. When the fluid pressure inside the anchor body 1 increases, the larger pressure squeezes the mounting seat 5 toward the relative outside, thereby driving the anchor head 31 to slide relatively toward the outside. The first spring 6 is stretched, so that the friction block 32 on the anchor head 31 contacts the inner wall of the pipeline, so that anchoring can be performed. At this time, the slide 23 will drive the second plate 11 to slide together. The second plate 11 slides in the second slide groove 15. The second plate 11 drives the first piston 12 to slide in the second slide groove 15. The second sealing ring 14 can ensure the sealing between the first plate 10 and the second plate 11. The second spring 13 is stretched, so that the sealing of the first slide groove 4 can be ensured at this time, so that the slide The sliding of 23 will not be restricted, thereby preventing the anchor head 31 from getting stuck, the electric valve 22 is in a normally open state, and the pressure in the third slide groove 43 is the same as that outside. The slide plate 23 is pushed to slide by the pressure, and the second piston 21 is pushed by the pressure, thereby ensuring the anchoring effect of the device; when the pressure in the device is unstable, the electric valve 22 is closed under a higher pressure state, so that fluid remains in the third slide groove 43. After the electric valve 22 is closed, even if the external pressure changes, the pressure of the fluid in the third slide groove 43 remains unchanged. Therefore, the second rod body 20 can be pushed by the pressure of the fluid in the third slide groove 43, so that the second rod body 20 pushes and squeezes the slide plate 23, thereby ensuring the stability of the slide plate 23 When the first spring 6 and the second spring 13 rebound at the same time, the mounting seat 5 can be driven to reset, so that the mounting seat 5 drives the friction block 32 away from the inner wall of the pipe, so that there is no more friction between the friction block 32 and the pipe, and the device no longer plays an anchoring role. At this time, the electric valve 22 is in the normally open state, and the pressure in the third slide groove 43 is the same as that outside. The slide plate 23 is reset, and the second piston 21 pushes the fluid in the third slide groove 43 out, so as not to limit the sliding of the slide plate 23. When the friction block 32 is worn, the surface of the friction block 32 becomes thinner, and the anchoring effect becomes worse, until the friction block 32 becomes thinner to a certain thickness. When the anchor head 31 needs to be replaced, the friction block 32 located in the middle is rotated to rotate the friction block 32, thereby driving the screw 36 to rotate, and the screw 36 can be taken out. Then, the anchor head 31 is pulled, so that the first clamping groove 38 and the first clamping block 37 lose the clamping relationship, and the second clamping groove 42 and the second clamping block 41 lose the clamping relationship, and the plug 39 is pulled out from the second slot 40, thereby realizing the disassembly of the anchor head 31 and the replacement of the anchor head 31.

[0047] In addition, it should be understood that although this specification is described in terms of implementation methods, not every implementation method contains only one independent technical solution. This narrative method of the specification is only for the sake of clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in each embodiment can also be appropriately combined to form other implementation methods that can be understood by those skilled in the art.

Claims

1. A self-locking hydraulic anchor for oil well fracturing and acidizing, comprising an anchor body (1), characterized in that: The anchor body (1) includes connecting ends (2) at both ends, a plurality of through grooves (3) are provided on the peripheral side of the anchor body (1), a mounting seat (5) is slidably fitted in the through groove (3), an anchor head (31) is provided on one side of the mounting seat (5), a connecting structure is provided between the mounting seat (5) and the anchor head (31), a friction structure is provided on the anchor head (31), the friction structure corresponds to the connecting structure, the friction structure includes a plurality of friction blocks (32), an auxiliary friction structure is provided in the friction block (32), a first slide groove (4) is provided in the through groove (3), the first slide groove ( 4) corresponding to the mounting seat (5), the anchor body (1) is provided with a locking structure, the locking structure is corresponding to the mounting seat (5), a sealing structure, a reset structure and a stabilizing structure are provided between the first slide groove (4) and the mounting seat (5), the auxiliary friction structure includes an auxiliary block (35), a second groove (33) is provided in the friction block (32), the auxiliary block (35) is located in the second groove (33), and a fourth spring (34) is fixed between the auxiliary block (35) and the groove wall of the second groove (33), the mounting seat (5) includes a slide plate (23) and a connecting member The seat (24) includes a connecting structure including an insert (39), the insert (39) is fixedly connected to the connecting seat (24), a second slot (40) is provided in the anchor head (31), the second slot (40) corresponds to the insert (39), a friction block (32) located in the middle is rotatably connected to the anchor head (31), a screw (36) is fixed on the friction block (32) located in the middle, the screw (36) is threadedly matched with the insert (39), the other friction blocks (32) are fixedly connected to the anchor head (31), and a plurality of first clamping blocks (37) are fixed on the insert (39). ), a plurality of first card slots (38) are provided in the second slot (40), the first card slots (38) correspond to the first card block (37), a plurality of second card blocks (41) are fixed on the connecting seat (24), a plurality of second card slots (42) are provided in the anchor head (31), the second card slots (42) correspond to the second card block (41), when the surface of the friction block (32) is insufficient to block the rebound force of the fourth spring (34), the fourth spring (34) rebounds and pushes the auxiliary block (35) out, so that the auxiliary block (35) contacts the inner wall of the pipe.

2. The self-locking hydraulic anchor for oil well fracturing and acidizing according to claim 1, characterized in that: The slide plate (23) corresponds to the first slide groove (4), the connecting seat (24) corresponds to the connecting structure and the anchor head (31), the reset structure includes a first spring (6) fixed between the slide plate (23) and the groove wall of the first slide groove (4), a sealing gasket (8) is fixed in the first slide groove (4), and a first sealing ring (7) is installed between the connecting seat (24) and the groove wall of the through groove (3).

3. The self-locking hydraulic anchor for oil well fracturing and acidizing according to claim 1, characterized in that: The sealing structure includes a sealing plate (9) fixed between the slide plate (23) and the groove wall of the first slide groove (4), the sealing plate (9) includes a first plate body (10) and a second plate body (11), the first plate body (10) is fixedly connected to the groove wall of the first slide groove (4), the second plate body (11) is fixedly connected to the slide plate (23), a second slide groove (15) is provided in the first plate body (10), and the second slide groove (15) is slidably connected to the second plate body (11).

4. The self-locking hydraulic anchor for oil well fracturing and acidizing according to claim 3, characterized in that: A first piston (12) is fixed to the end of the second plate body (11), a second spring (13) is fixed between the first piston (12) and the groove wall of the second slide groove (15), a second sealing ring (14) is fixed in the second slide groove (15), and the second plate body (11) corresponds to the second sealing ring (14).

5. The self-locking hydraulic anchor for oil well fracturing and acidizing according to claim 1, characterized in that: The stabilizing structure includes a telescopic rod (16) fixed between the first slide groove (4) and the slide plate (23), a first connecting port (17) is provided in the first slide groove (4), an electric valve (22) is installed in the first connecting port (17), the telescopic rod (16) includes a first rod body (19) and a second rod body (20), the first rod body (19) is fixedly connected to the groove wall of the first slide groove (4), the second rod body (20) is fixedly connected to the slide plate (23), a third slide groove (43) is provided in the first rod body (19), the third slide groove (43) corresponds to the second rod body (20), a second piston (21) is fixed at the end of the second rod body (20), the second piston (21) is slidably connected to the third slide groove (43), a second connecting port (18) is provided in the third slide groove (43), and the second connecting port (18) is connected to the first connecting port (17).

6. The self-locking hydraulic anchor for oil well fracturing and acidizing according to claim 1, characterized in that: The locking structure includes a plurality of insertion rods (28), a plurality of first slots (29) are provided on the peripheral side of the slide plate (23), the first slots (29) correspond to the insertion rods (28), a plurality of first grooves (25) are provided on the peripheral side of the first slide groove (4), a slider (27) is slidably fitted in the first groove (25), and the slider (27) is fixedly connected to the insertion rod (28).

7. The self-locking hydraulic anchor for oil well fracturing and acidizing according to claim 6, characterized in that: A third spring (26) is fixed between the slider (27) and the groove wall of the first groove (25), an electromagnet (30) is fixed to the top of the first groove (25), the slider (27) is made of iron material, and the electromagnet (30) corresponds to the slider (27).

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