Energy storage library old well casing cutting tool

Abstract

The present application relates to the technical field of clean energy storage, and particularly relates to a storage library old well casing cutting tool, which aims to alleviate the technical problem of low casing cutting efficiency in related technologies. The storage library old well casing cutting tool comprises a body, an accommodating groove is arranged on the outer wall of the body; a sand blasting mechanism is arranged in the inner cavity of the body and is configured to spray mixed fluid of water and sand to the outside of the body along the radial direction of the body under a pressing working condition; a mechanical cutter mechanism comprises a cutter and a driver, wherein the cutter is in the accommodating groove, and the driver is arranged in the body and is in transmission connection with the cutter to drive the cutter to unfold and extend out of the accommodating groove. The storage library old well casing cutting tool can significantly improve the efficiency of casing cutting, shorten the construction period and promote the rapid construction of compressed air energy storage projects.

Description

Technical Field

[0001] This invention relates to the field of clean energy storage technology, and in particular to a tool for removing casing from old wells in energy storage facilities. Background Technology

[0002] During the permanent sealing of old wells in energy storage facilities, to ensure the reliability of the sealing, the casing of the old well needs to be removed, then the borehole is enlarged to the formation, and cement grout is injected for sealing. This process is to prevent gas leakage in the longitudinal direction and transverse formation loss due to cracks in the cement sheath outside the casing and gaps in the double interface, thus achieving the purpose of permanent well sealing. The specific operation is as follows: at the relatively intact caprock above the sealing layer, a length of 40-50m of casing is removed, and the cement sheath on the well wall is drilled out using enlargement technology, enlarging the borehole to the position where the original wellbore contacts the formation, and then cement is injected for permanent sealing.

[0003] Currently, the efficiency of cannulation removal is low, with an average removal speed of 0.25 m / h, and multiple operations are required. On average, only 7-9 m can be removed per operation, which significantly prolongs the operation cycle. Summary of the Invention

[0004] The purpose of this invention is to provide a casing removal tool for old wells in energy storage facilities, so as to alleviate the technical problem of low casing removal efficiency in related technologies.

[0005] To solve the above-mentioned technical problems, the technical solution provided by the present invention is as follows:

[0006] The energy storage well casing removal tool provided by the present invention includes: a body having a receiving groove on its outer wall; a sandblasting mechanism disposed within the inner cavity of the body and configured to spray a mixture of water and sand outwards along the radial direction of the body under pressure conditions; and a mechanical cutter mechanism including a cutter and a driver, wherein the cutter is located within the receiving groove, the driver is disposed within the body and is drively connected to the cutter to drive the cutter to unfold and extend outwards from the receiving groove.

[0007] Furthermore, the main body is provided with perforations penetrating its sidewalls, and the perforations are spaced apart from the receiving grooves;

[0008] The sandblasting mechanism includes an ejector, which is fixed inside the perforation;

[0009] On the forward path of the body, the cutter extends into position behind the injector.

[0010] Furthermore, the receiving groove is provided with a transmission assembly, which includes a support plate, a first hinge rod, a second hinge rod, and a third hinge rod.

[0011] The support plate is fixed in the receiving groove, and has a first arc-shaped sliding groove on it;

[0012] One end of the first hinged rod is fixed with a drive shaft and is hinged to the support plate through the drive shaft; the other end is hinged to one end of the second hinged rod through a hinge shaft.

[0013] The driver is connected to the drive shaft to drive the drive shaft to rotate around its own axis;

[0014] The other end of the second hinge rod is hinged to one end of the third hinge rod via a first pin. The first pin can pass through the first slide groove when the transmission shaft is rotating and slide along the extension direction of the first slide groove.

[0015] The third hinge support rod is provided with a second pin, which passes through the support plate and is parallel to the first pin, and both are perpendicular to the axis of the body.

[0016] The cutter is fixed to the other end of the third hinge rod.

[0017] Furthermore, the support plate is also provided with a second sliding groove, which is straight and extends in the same direction as the axis of the body.

[0018] In the initial state, both the first pin and the second pin pass through the second groove;

[0019] One end of the first groove is connected to the second groove, and the other end extends away from the second groove.

[0020] Furthermore, along the axial direction of the body, a flow channel is provided in the side wall of the body, and both ends of the flow channel are connected to the inner cavity of the body, and are also connected to the injector through the inner cavity of the body;

[0021] The driver uses an angle wheel, which is located in the flow channel and fixed to the drive shaft, and is rotatably connected to the body through the drive shaft.

[0022] Furthermore, the sandblasting mechanism also includes: a fixed cylinder, a pressure cylinder, and a support spring;

[0023] The fixed cylinder is fixed inside the inner cavity of the main body, and there is a gap between its outer wall and the inner wall of the main body. An ejector facing the ejector is fixed inside its side wall.

[0024] The pressure cylinder is sleeved on the fixed cylinder and can slide along the axial direction of the fixed cylinder toward the ejector under pressure conditions to form a gap with the inner wall of the main body;

[0025] The support spring is sleeved on the lower pressure cylinder, with one end in contact with the lower pressure cylinder and the other end in contact with the body. The support spring causes the lower pressure cylinder to slide away from the ejector, so as to form a sand-collecting cavity with the inner wall of the body.

[0026] Furthermore, in the pressure cylinder, the area of ​​its top end, which is away from the ejector, is larger than the area of ​​its bottom end;

[0027] The flow channel has an inlet and an outlet in opposite directions. In the axial direction of the body, the inlet is located on the side of the pressure cylinder away from the ejector, and the outlet is close to the ejector.

[0028] A rupture disc is fixed inside the flow channel, the rupture disc blocks the flow channel, and is located between the liquid inlet and the actuator.

[0029] Furthermore, the pressure cylinder includes a retaining ring and two arc-shaped plates;

[0030] The two arc-shaped plates are spaced apart and symmetrically distributed about the axis of the fixing ring, and one end of each plate is fixed to the fixing ring. The outer walls of the two plates are used to enclose the inner wall of the main body to form the sand-holding cavity.

[0031] The liquid outlet is directly opposite the gap between the two arc-shaped plates.

[0032] Furthermore, a boss is formed on the inner wall of the fixed cylinder. The boss is annular and located on the side of the ejector close to the pressure cylinder.

[0033] Furthermore, there are two perforations and two receiving slots, and the two perforations are symmetrically distributed about the axis of the body, and the two receiving slots are also symmetrically distributed. In the circumferential direction of the body, the perforations and the receiving slots are staggered.

[0034] The ejector corresponds to the perforation, and the mechanical knife mechanism corresponds to the receiving groove.

[0035] In summary, the technical effects achieved by the energy storage well casing removal tool provided by this invention are as follows:

[0036] In this old well casing removal tool for the energy storage reservoir, the sandblasting mechanism can spray a mixture of water and sand under hydraulic conditions to cut the casing and create a slit on it. Through the driver, the cutter can extend to the slit and sit on the casing. Under rotation, the cutter will grind the casing. The sandblasting mechanism and the mechanical cutter mechanism work together to achieve a combined hydraulic-mechanical action to quickly remove the casing.

[0037] It can be seen that, compared with existing technologies, this old well casing removal tool for energy storage can significantly improve the efficiency of casing removal, shorten the construction cycle, and promote the rapid construction of compressed air energy storage projects. Attached Figure Description

[0038] To more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of the present invention. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0039] Figure 1 This is a schematic diagram of the structure of the old well casing removal tool for energy storage tanks provided in an embodiment of the present invention;

[0040] Figure 2 for Figure 1 Enlarged view of point I;

[0041] Figure 3 for Figure 1 A structural diagram from another angle;

[0042] Figure 4 for Figure 3 Enlarged view of section II;

[0043] Figure 5 This is a schematic diagram of the structure of the old well casing removal tool for energy storage tanks provided in the embodiment of the present invention in the downward cutting state;

[0044] Figure 6 for Figure 5 Enlarged view of section III;

[0045] Figure 7 This is a schematic diagram of the structure of the old well casing cutting tool for energy storage tanks provided in the embodiment of the present invention in the cutter unfolded state;

[0046] Figure 8 for Figure 7 Enlarged view of point IV;

[0047] Figure 9 This is a schematic diagram of the connection of the support plate provided in an embodiment of the present invention;

[0048] Figure 10 for Figure 9 A magnified view of section V;

[0049] Figure 11 This is a top view of the old well casing removal tool for energy storage tanks provided in an embodiment of the present invention;

[0050] Figure 12 for Figure 11Sectional view in the AA direction;

[0051] Figure 13 for Figure 12 A magnified view of point VI;

[0052] Figure 14 for Figure 11 A sectional view along the A1-A1 direction;

[0053] Figure 15 for Figure 11 Sectional view in the BB direction;

[0054] Figure 16 This is a schematic diagram of the structure of the pressure cylinder provided in an embodiment of the present invention;

[0055] Figure 17 for Figure 15 A schematic diagram in the spraying state;

[0056] Figure 18 for Figure 15 A diagram after the pitch;

[0057] Figure 19 This is a schematic diagram of the old well casing cutting tool for energy storage tanks provided in an embodiment of the present invention under the cutting condition;

[0058] Figure 20 This is a schematic diagram of the old well casing removal tool for energy storage tanks provided in an embodiment of the present invention under the condition of being stuck in a clamp.

[0059] Icons: 100 - Body; 110 - Receiving groove; 120 - Flow channel; 130 - Upper step; 140 - Lower step;

[0060] 200-Sandblasting mechanism; 210-Ejector; 220-Fixed cylinder; 230-Pressure cylinder; 240-Support spring; 250-Ejector; 221-Boss; 231-Fixed ring; 232-Arc plate; 2321-Wing plate;

[0061] 300 - Mechanical blade mechanism; 310 - Cutting blade; 320 - Driver; 330 - Support plate; 340 - First hinge rod; 350 - Second hinge rod; 360 - Third hinge rod; 370 - Drive shaft; 380 - First pin; 390 - Second pin; 331 - First slide groove; 332 - Second slide groove;

[0062] 400 - Sand chamber; 500 - Rupture plate; 600 - Blocking ball; 700 - Casing; 800 - Formation. Detailed Implementation

[0063] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. The components of the embodiments of the present invention described and shown in the accompanying drawings can generally be arranged and designed in various different configurations.

[0064] Therefore, the following detailed description of the embodiments of the invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but merely to illustrate selected embodiments of the invention. All other embodiments obtained by those skilled in the art based on the embodiments of the invention without inventive effort are within the scope of protection of the invention.

[0065] The following detailed description of some embodiments of the present invention is provided in conjunction with the accompanying drawings. Unless otherwise specified, the following embodiments and features can be combined with each other.

[0066] Currently, the efficiency of cannulation removal is low, with an average removal speed of 0.25 m / h, and multiple operations are required. On average, only 7-9 m can be removed per operation, which significantly prolongs the operation cycle.

[0067] In view of this, the present invention provides a casing removal tool for old wells in energy storage facilities, comprising a body 100, a sandblasting mechanism 200, and a mechanical cutter mechanism 300; the body 100 is a tube with one end open and the other end closed, and a receiving groove 110 is cut on its outer wall, the receiving groove 110 being not connected to the inner cavity of the body 100; the sandblasting mechanism 200 is disposed in the inner cavity of the body 100 and configured to spray a mixture of water and sand along the radial direction of the body 100 outward under pressure conditions; the mechanical cutter mechanism 300 includes a cutter 310 and a driver 320, wherein the cutter 310 is located in the receiving groove 110, and the driver 320 is disposed in the body 100 and is connected to the cutter 310 in a transmission manner to drive the cutter 310 to unfold and extend outward from the receiving groove 110.

[0068] In the old well casing removal tool of this energy storage tank, the sandblasting mechanism 200 can spray a mixture of water and sand under hydraulic conditions to cut the casing 700 and form a slit on the casing 700; through the driver 320, the cutter 310 can be extended to the slit and seated on the casing 700. Under rotation conditions, the cutter 310 will grind the casing 700; the sandblasting mechanism 200 and the mechanical cutter mechanism 300 cooperate with each other to achieve a hydraulic-mechanical combined action and quickly remove the casing 700.

[0069] It can be seen that, compared with existing technologies, this old well casing removal tool for energy storage can significantly improve the efficiency of casing removal, shorten the construction cycle, and promote the rapid construction of compressed air energy storage projects.

[0070] The following combination Figures 1 to 20 The structure and shape of the old well casing removal tool for energy storage tanks provided in this embodiment are described in detail:

[0071] In this embodiment, reference Figures 1 to 15 The upper part of the body 100 is provided with a female thread for connecting with oil tubing or drill pipe, etc., and the lower part is bullet-shaped to facilitate the smooth insertion of the tool into the well casing 700.

[0072] As described above, the body 100 is provided with perforations penetrating its sidewalls, and the perforations and receiving grooves 110 are distributed at intervals; more preferably, there are two perforations, which are symmetrically distributed about the axis of the body 100, and there are also two receiving grooves 110, which are symmetrically distributed about the axis of the body 100. Furthermore, the receiving grooves 110 and the perforations are staggered at 90° on the cross-section of the body 100.

[0073] Continuing from the above, the sandblasting mechanism 200 includes an ejector 210, which corresponds one-to-one with the perforation and is threadedly connected to the inner wall of the perforation to be fixed to the body 100; the mechanical blade mechanism 300 corresponds one-to-one with the receiving groove 110. With this design, the sandblasting mechanism 200 and the mechanical blade mechanism 300 do not interfere with each other, but cooperate with each other under the cutting condition to ensure the cutting efficiency of the sleeve 700.

[0074] Regarding the mechanical cutting mechanism 300, specifically:

[0075] refer to Figures 1 to 14 The mechanical cutting mechanism 300 also includes a transmission assembly, which includes a support plate 330, a first hinge rod 340, a second hinge rod 350, and a third hinge rod 360.

[0076] As described above, the receiving groove 110 is a rectangular groove, and the supporting plate 330 is a cuboid plate with a certain thickness, welded to the bottom surface of the receiving groove 110, in combination with... Figure 9 and Figure 10 As shown, the left and right sides of the support plate 330 are spaced apart from the left and right sides of the receiving groove 110 and are parallel to each other, and the front end of the support plate 330 does not protrude from the outer edge of the receiving groove 110.

[0077] Continuing from the above, in combination Figure 9 and Figure 10 As shown, in the thickness direction of the support plate 330, the support plate 330 is provided with a first groove 331 and a second groove 332 that penetrate through it. The first groove 331 is arc-shaped, which is a quarter-circle arc. The second groove 332 is straight and is divided into upper and lower sections by the first groove 331. Its bottom end is flush with the bottom end of the first groove 331.

[0078] Continuing from the above, the upper end of the first hinge rod 340 is fixed with a drive shaft 370 and is hinged to the support plate 330 via the drive shaft 370. The lower end is hinged to the upper end of the second hinge rod 350 via a hinge shaft. The driver 320 is connected to the drive shaft 370 to drive the drive shaft 370 to rotate around its own axis. The lower end of the second hinge rod 350 is hinged to the upper end of the third hinge rod 360 via a first pin 380. The first pin 380 passes through the second slide groove 332 and can slide along the upper section of the second slide groove 332 and the... The slide 331 slides in the direction of its extension; the third hinge rod 360 is a thick metal sheet in the shape of a fishhook, and its fishhook-shaped side is a plane, which is welded to the outer surface of the cutter 310. The third hinge rod 360 is also provided with a second pin 390, which is inserted into the second slide 332; the cutter 310 is an ordinary cutting tool with a forked bottom. When the cutter 310 is opened, it can sit and be clamped on the end face of the sleeve 700. When the cutter 310 is rotated and pressed down, it can play the role of drilling and grinding the sleeve 700.

[0079] Continuing from the above, along the axial direction of the body 100, a flow channel 120 is provided in the side wall of the body 100. Both ends of the flow channel 120 are connected to the inner cavity of the body 100, and it is also connected to the ejector 210 through the inner cavity of the body 100. A crushing disc 500 is provided in the flow channel 120, which is located above the driver 320 to block the flow channel 120. Under a certain liquid pressure, the crushing disc 500 will break into powder, allowing the flow channel 120 to flow freely. The driver 320 is an angle wheel, which is a fluid flushing rotating wheel. It is located in the flow channel 120 and fixed to the drive shaft 370, and is rotatably connected to the body 100 through the drive shaft 370. The side walls between the flow channel 120 and the receiving tank 110 are sealed with the drive shaft 370 by a sealing ring.

[0080] Regarding the sandblasting mechanism 200, specifically:

[0081] refer to Figure 15 The sandblasting mechanism 200 also includes: a fixed cylinder 220, a pressure cylinder 230, a support spring 240, and an ejector 250.

[0082] As described above, the injector 210 is cylindrical, with an internal flow channel for a conical nozzle and an external threaded male thread, which is threaded to the side wall of the body 100. The inner wall of the body 100 has two protruding steps, namely the upper step 130 and the lower step 140, and the bottom of the inner cavity has a threaded female thread for connecting to the fixed cylinder 220.

[0083] Continuing from the above, in combination Figure 16As shown, the pressure cylinder 230 includes a fixing ring 231 and two arc-shaped plates 232. The fixing ring 231 is disc-shaped, and sealing grooves are opened on both its inner and outer sides to form a seal with the inner wall of the body 100 and the outer wall of the fixing cylinder 220. The two arc-shaped plates 232 are spaced apart and symmetrically distributed about the axis of the fixing ring 231. One end of each plate is fixed to the fixing ring 231. Wings 2321 are protruding on the outer walls of the two plates. The upper and lower edges of the wings 2321 are used to contact the upper step 130 and the lower step 140, and the two side edges are used to contact the inner wall of the body 100. Optionally, the groove between the two arc-shaped plates 232 is spaced at an angle of 60°, and the groove is directly opposite the lower outlet of the receiving groove 110 and the flow channel 120.

[0084] Continuing from the above, the fixed cylinder 220 is cylindrical in shape, with a stepped shaft on the outside. The diameter of the lower section is larger than that of the upper section, forming a step. The lower section has three holes drilled symmetrically on each side wall for installing ejectors 250. The outer wall of the bottom of the lower section has a male thread for connecting to the inside of the body 100. The interior of the fixed cylinder 220 has a variable diameter center hole, with a neck at the lower part forming a boss 221 for blocking the placement of the ball 600. The ejector 250 is cylindrical, with an inner flow channel for a conical nozzle inside and a male thread on the outside. It is connected to the thick wall of the fixed cylinder 220 by threads, and two rows are installed symmetrically.

[0085] During installation, the threaded end of the fixing cylinder 220 is facing downwards and screwed onto the inner thread of the body 100. The pressure cylinder 230 is then fitted onto the outside of the fixing cylinder 220, so that the upper edge of the wing plate 2321 is in contact with the upper step 130 of the body 100. At this time, the conical step of the pressure cylinder 230, i.e., the lower edge, is in contact with the lower step 140 of the body 100, and the two sides are in contact with the inner wall of the body 100. Thus, the pressure cylinder 230 and the body 100 enclose and form upper and lower chambers. The upper chamber contains the support spring 240, which is a compression spring. Its upper end is connected to the fixing ring 231, and its lower end is connected to the upper step 130. The lower chamber is the sand-holding chamber 400, which contains abrasive sand such as quartz sand, or iron sand or other abrasive particles for spraying. It should be noted here that the length of the sand-holding cavity 400 can be designed and extended according to the required amount of abrasive, that is, by extending the interval between the upper step 130 and the lower step 140 of the main body 100 and the size of the wing plate 2321.

[0086] The working process of the old well casing removal tool for energy storage tanks provided in this embodiment is as follows:

[0087] 1. Insert the tool into the well to the location where the casing needs to be removed, using drill pipe, tubing, or other delivery strings. Before inserting the tool into the well, fill the sand-holding chamber 400 with a certain amount of quartz sand according to the operational requirements.

[0088] 2. The drilling rig on the surface starts to rotate, causing the entire wellbore string to begin rotating. High-pressure water is injected into the delivery string from the surface via a pump truck (pressure testing). The pressure tested is less than the pressure at which the rupture disc 500mm ruptures. At this point, the downhole hydraulic blasting and slotting operation begins. Details are as follows:

[0089] (1) Water pressure acts on the upper surface of the fixing ring 231 of the pressure cylinder 230, and simultaneously acts on the lower surface of the conical step of the pressure cylinder 230 after passing through the ejector 250. Since the area of ​​the upper surface is larger than that of the lower surface, the force generated by the water pressure on the upper surface is greater than the force generated on the lower surface, forming a downward resultant force. Under the action of this force, the pressure cylinder 230 moves downward, as... Figure 17 As shown. Here, the maximum position reached by the downward pressure cylinder 230 is when its conical step sits on the outer step of the fixed cylinder 220, at which point the support spring 240 is in a compressed state.

[0090] (2) As the pressure cylinder 230 descends, the upper and lower edges of the flange 2321 are offset from the upper step 130 and lower step 140, respectively. Thus, the sand-containing cavity 400 is no longer a closed cavity, forming a flow channel opening. The quartz sand inside flows downwards under the influence of gravity, such as... Figure 17 As shown.

[0091] (3) Simultaneously, the fluid flows into the ejector 250 through the inside of the fixed cylinder 220. The ejector 250 sprays the fluid at high speed into the cavity between the outer wall of the fixed cylinder 220 and the inner wall of the body 100. Under the change of fluid velocity, a "pressure difference drainage" effect is formed in the cavity, which draws the quartz sand down. The fluid also forms a complex turbulent flow effect in this cavity. The quartz sand and the fluid are fully mixed in this cavity and then ejected at high speed by the ejector 210.

[0092] (4) The mixed fluid ejected at high speed by the ejector 210 impacts the sleeve 700, such as... Figure 19 As shown. With the tool rotating, a slit is cut into the sleeve 700, severing it. According to indoor experimental results, for an N80 sleeve 700, a slit can be formed after 5 minutes of spraying under a pressure of 20 MPa.

[0093] To remove a section of casing 700, the entire tubing string needs to be lowered while rotating. Since water jetting is used alone, the tool does not contact the casing 700, making it impossible to accurately assess the removal status. Although laboratory experiments can guide casing removal, the actual situation inside the well is uncertain. Part of the casing 700 may be removed, but some may remain unremoved. Furthermore, water jetting requires high precision in terms of silica sand and water volume. Therefore, once a cut is made in the casing 700, a combined water-mechanical casing removal process is initiated.

[0094] (5) After spraying for 5 minutes, the pump is stopped on the ground. The pressure cylinder 230 returns to its original state under the rebound force of the support spring 240. The outlet of the sand chamber 400 is closed and returns to a closed chamber. At this time, a blocking ball 600 is put into the pipe column. The blocking ball 600 sits on the boss 221 of the fixed cylinder 220 through the pipe column and blocks the inner hole of the fixed cylinder 220.

[0095] (6) When the pump is started on the ground, the internal channel of the fixed cylinder 220 is blocked, and the pressure in the entire tubing increases. When the pressure is higher than the rupture pressure of the rupture disc 500, the rupture disc 500 is crushed and broken into powder. The fluid passes through the flow channel 120, bypasses the seal and blockage of the lower pressure cylinder 230, and enters the cavity formed by the outer wall of the fixed cylinder 220 and the inner wall of the body 100. At this time, the lower pressure cylinder 230 is still moving downward under the combined force of the upper and lower surfaces, causing the quartz sand to mix with the fluid. Since the ejector 250 is not working at this time, the concentration of quartz sand in the fluid will decrease accordingly, which reduces the impact energy of the mixed fluid ejected through the ejector 210.

[0096] (7) When the fluid flows through the flow channel 120, it impacts the angular wheel installed inside, causing the angular wheel to rotate. The rotation of the angular wheel drives the first hinge rod 340 to rotate via the drive shaft 370. The other end of the first hinge rod 340 is connected to the second hinge rod 350, which in turn drives the second hinge rod 350 to rotate. The other end of the second hinge rod 350 is connected to the third hinge rod 360, and the third hinge rod 360 and the second hinge rod 350 are hinged by the first pin 380. The first pin 380 is constrained by the second slide groove 332, causing the third hinge rod 360 to descend along the second slide groove 332, thereby driving the cutter 310 to descend. Figure 5 and Figure 6 As shown. Here, the purpose of the third hinge rod 360 driving the cutter 310 downward first is to bring the lower edge of the cutter 310 closer to the injector 210, thereby bringing the lower edge of the cutter 310 closer to the cut formed by the injection.

[0097] (8) The corner wheel continues to rotate, driving the first hinge rod 340 and the second hinge rod 350 to rotate, causing the first pin 380 to descend to the connection between the first slide groove 331 and the second slide groove 332, and the second pin 390 to descend to the bottom of the second slide groove 332, as... Figure 5 and Figure 6 As shown, at this point, the first pin 380 cannot continue to descend along the second slide groove 332. Under the continuous transmission of the drive shaft 370, it slides along the first slide groove 331, as... Figure 7 and Figure 8 As shown.

[0098] (9) Due to the fishhook-shaped design of the third hinge rod 360, when its upper end moves along the first sliding groove 331 into the receiving groove 110, the hook at the lower part extends outward, thereby causing the welded cutter 310 to open outward, such as Figure 7 and Figure 8 As shown.

[0099] (10) After the cutter 310 opens, it sits and is clamped on the cut section of the sleeve 700 formed by the water jet, such as Figure 20 As shown, the cutter 310 (a conventional cutter) has grinding teeth (not shown in the figure) on its body 100. During the rotation and downward pressing of the tubing string, it can grind the casing 700, working in conjunction with the hydraulic jetting to form a combined hydraulic-mechanical action, achieving rapid removal of the casing 700. Furthermore, due to the inherent characteristics of hydraulic jetting, its jetting distance is relatively long. Therefore, after the casing 700 is removed, it will jet into the formation 800, creating an enlarged borehole at the corresponding location of the removed casing 700, facilitating subsequent sealing operations.

[0100] It should be added here that after the tool is seated, it comes into contact with the casing 700. During the downward pressing of the casing string, there will be a downward pressure display on the ground drilling platform. If the downward pressure continues to increase and the casing string does not move downward, it means that the casing 700 has not yet been removed and continuous rotation, jetting, and drilling are required. If the downward pressure is relatively stable and the casing string moves downward at a uniform speed, it means that the casing 700 is being gradually removed and the removal efficiency is high. If the downward pressure is small and the casing string moves downward quickly, it means that the casing 700 has been removed.

[0101] (11) After cutting off a section of casing 700, the pump is stopped on the surface, the tubing string stops rotating, and the entire tubing string is lifted. At this time, the cutter 310 has not yet been retracted and is in the open state. When the tool moves up to the end face of the cutter 310 and touches the bottom of the upper section of casing 700, the lifting force increases, and under the obstruction of the upper section of casing 700, the cutter 310 retracts to a position equivalent to the inner diameter of casing 700, so that the tool can be successfully pulled out to the wellhead, completing the entire casing 700 removal operation.

[0102] This invention provides a casing removal tool for old wells in an energy storage facility, comprising a body 100, a mechanical cutting mechanism 300, and a sandblasting mechanism 200. The mechanical cutting mechanism 300 and the sandblasting mechanism 200 are mounted on the body 100 at a 90° angle in the horizontal direction, staggered from each other to avoid interference. The sandblasting mechanism 200, using a downpressure cylinder 230, an ejector 250, and an ejector 210, can perform downhole hydraulic abrasive spraying without the need for surface sand supply equipment, creating a cut at the casing 700. The mechanical cutting mechanism 300 uses hydraulic rotation and hinged transmission to open the cutting blade 310, which is then seated on the cut at the casing 700. Utilizing the combined hydraulic and mechanical action, rapid casing removal at the casing 700 is achieved, and the effectiveness of the casing removal is judged based on changes in the downpressure and downflow velocity of the tubing string. The use of this tool can significantly improve the efficiency of casing removal at the casing 700, shorten the construction cycle, and promote the rapid construction of compressed air energy storage projects.

[0103] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, and not to limit them; although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features; and these modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A tool for cutting the casing of an old well in an energy storage tank, characterized in that, include: The body (100) has a receiving groove (110) on its outer wall; a sandblasting mechanism (200) is disposed in the inner cavity of the body (100) and configured to spray a mixture of water and sand along the radial direction of the body (100) to the outside of the body (100) under pressure conditions; a mechanical blade mechanism (300) includes a cutter (310) and a driver (320), wherein the cutter (310) is located in the receiving groove (110), and the driver (320) is disposed in the body (100) and is connected to the cutter (310) in a transmission connection to drive the cutter (310) to unfold and extend to the outside of the receiving groove (110).

2. The energy storage well casing removal tool according to claim 1, characterized in that, The main body (100) is provided with perforations penetrating its sidewalls, and the perforations are distributed at intervals with the receiving groove (110); The sandblasting mechanism (200) includes an ejector (210) which is fixed inside the perforation; On the forward path of the body (100), the cutter (310) is positioned behind the injector (210) after extending into place.

3. The energy storage well casing removal tool according to claim 2, characterized in that, The receiving groove (110) is provided with a transmission assembly, which includes a support plate (330), a first hinge rod (340), a second hinge rod (350) and a third hinge rod (360); The support plate (330) is fixed in the receiving groove (110), and has a first arc-shaped sliding groove (331) on it; One end of the first hinge rod (340) is fixed with a drive shaft (370) and is hinged to the support plate (330) through the drive shaft (370), and the other end is hinged to one end of the second hinge rod (350) through a hinge shaft; The driver (320) is connected to the drive shaft (370) to drive the drive shaft (370) to rotate about its own axis; The other end of the second hinge rod (350) is hinged to one end of the third hinge rod (360) via a first pin (380). The first pin (380) can pass through the first slide groove (331) when the transmission shaft (370) is rotating, and slide along the extension direction of the first slide groove (331). The third hinge support rod (360) is provided with a second pin (390), which passes through the support plate (330) and is parallel to the first pin (380), and both are perpendicular to the axis of the body (100). The cutter (310) is fixed to the other end of the third hinge rod (360).

4. The energy storage well casing removal tool according to claim 3, characterized in that, The support plate (330) is also provided with a second sliding groove (332), which is straight and extends in the same direction as the axis of the body (100). In the initial state, both the first pin (380) and the second pin (390) pass through the second groove (332); One end of the first groove (331) is connected to the second groove (332), and the other end extends away from the second groove (332).

5. The energy storage tank old well casing cutting tool according to claim 3, characterized in that, Along the axial direction of the body (100), a flow channel (120) is provided in the side wall of the body (100). Both ends of the flow channel (120) are connected to the inner cavity of the body (100) and are also connected to the injector (210) through the inner cavity of the body (100). The driver (320) is a corner wheel, which is located in the flow channel (120) and fixed to the drive shaft (370), and is rotatably connected to the body (100) through the drive shaft (370).

6. The energy storage well casing removal tool according to claim 5, characterized in that, The sandblasting mechanism (200) further includes: a fixed cylinder (220), a pressure cylinder (230), and a support spring (240); The fixed cylinder (220) is fixed inside the cavity of the body (100), and there is a gap between its outer wall and the inner wall of the body (100). An ejector (250) facing the ejector (210) is fixed inside its side wall. The pressure cylinder (230) is sleeved on the fixed cylinder (220) and can slide along the axial direction of the fixed cylinder (220) close to the ejector (250) under the pressure condition to form a gap with the inner wall of the body (100); The support spring (240) is sleeved on the pressure cylinder (230), with one end in contact with the pressure cylinder (230) and the other end in contact with the body (100). The support spring (240) causes the pressure cylinder (230) to slide away from the ejector (250) so as to form a sand-holding cavity (400) by enclosing the inner wall of the body (100).

7. The energy storage well casing removal tool according to claim 6, characterized in that, In the pressure cylinder (230), the area of ​​its top end, which is away from the ejector (250), is larger than the area of ​​its bottom end; The flow channel (120) has an inlet and an outlet in opposite directions. In the axial direction of the body (100), the inlet is located on the side of the pressure cylinder (230) away from the ejector (250), and the outlet is close to the ejector (250). A crushing disc (500) is fixed inside the flow channel (120), the crushing disc (500) blocks the flow channel (120) and is located between the liquid inlet and the driver (320).

8. The energy storage well casing removal tool according to claim 7, characterized in that, The pressure cylinder (230) includes a retaining ring (231) and two arc-shaped plates (232); Two arc-shaped plates (232) are spaced apart and symmetrically distributed about the axis of the fixing ring (231), and one end of each plate is fixed to the fixing ring (231). The outer walls of the two plates are used to enclose the inner wall of the body (100) to form the sand-holding cavity (400). The liquid outlet is directly opposite the gap between the two arc-shaped plates (232).

9. The energy storage well casing removal tool according to claim 7, characterized in that, A boss (221) is formed on the inner wall of the fixed cylinder (220). The boss (221) is annular and located on the side of the ejector (250) near the pressure cylinder (230).

10. The energy storage reservoir old well casing removal tool according to any one of claims 2 to 9, characterized in that, Two perforations and two receiving grooves (110) are provided, and the two perforations are symmetrically distributed about the axis of the body (100), and the two receiving grooves (110) are also symmetrically distributed. In the circumferential direction of the body (100), the perforations and the receiving grooves (110) are staggered. The ejector (210) corresponds one-to-one with the perforation, and the mechanical knife mechanism (300) corresponds one-to-one with the receiving groove (110).

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