Coiled tubing depth correction positioning tool for gas storage airtight tubular column

Abstract

According to the coiled tubing depth correction positioning tool for the gas storage airtight tubular column, under the conditions that pressure releasing, well killing and pulling out of an original well airtight tubular column are not conducted, the depth correction positioning tool can be used for accurately correcting the position where the tubular column is located at the necking position of a connector, and meanwhile it is guaranteed that when a depth correction positioning tool string is pulled out, the depth correction positioning tool string is not prone to falling off. Downhole tools such as a safety valve and a sliding sleeve which do not scrape open a tubular column in a well. Comprising a continuous oil pipe and a depth correction positioning pipe which are communicated, the continuous oil pipe is communicated with a ground oil pipe vehicle, and the ground oil pipe vehicle places or lifts a tool, injects pressure into the tool and monitors the load change of the tool; the depth correction positioning pipe comprises a three-jaw anchor tile used for being in contact with the airtight pipe column to be located at the diameter shrinkage position of the pup joint and an outer cylinder used for containing the three-jaw anchor tile, and the outer cylinder is composed of a male connector slidably connected to the center shaft and the outer wall of the upper connector in a sleeving mode and a female connector connected to the outer wall of the bottom end of the male connector.

Description

Technical Field

[0001] The invention belongs to the field of oil field downhole operations, relates to a continuous oil pipe perforation and layer filling construction operation, and specifically is a continuous oil pipe depth calibration and positioning tool for a gas storage gas tightness pipe column. Background Art

[0002] For the permanent gas-tight pipe string of the oilfield gas storage, it is necessary to perform through-tubing perforation to increase the contact area between the pipe and the gas storage and adjust the storage capacity. Perforation is to form a channel between the pipe and the gas storage by drilling a series of holes on the pipe, so as to realize the injection and extraction of gas. If the gas storage well is to be perforated to expand the capacity, it must be constructed without pulling out the original well pipe string, releasing the pressure, and killing the well. The conventional depth calibration tool operation cannot be realized because the conventional depth calibration tool is used to calibrate the depth through the gap of the pipe coupling. In order to prevent the corrosion of the gas-tight pipe string of the gas storage, there is no gap or step between the male and female couplings of each gas-tight pipe string. Therefore, the gas-tight pipe string of the gas storage can only be perforated through the pipe with continuous tubing pressure; furthermore, if the conventional depth calibration tool is used to construct the gas-tight pipe string of the gas storage, there is a great risk of scraping the safety valve and sliding sleeve of the gas-tight pipe string when the tool is pulled out. Based on this special demand, it is necessary to develop a special string depth calibration tool for continuous tubing to achieve accurate positioning of the continuous tubing on the gas storage well gas tightness string, and then lower the perforating tool string to perform pressurized perforating operations to complete the storage capacity adjustment of the gas storage. Summary of the invention

[0003] In order to overcome the shortcomings of the prior art, the present invention provides a continuous oil tubing depth calibration and positioning tool for the gas-tight pipe string of a gas storage reservoir. The depth calibration and positioning tool can accurately calibrate the position of the neck of the pipe string landing joint without releasing pressure, pressing the well, or pulling out the gas-tight pipe string from the original well. At the same time, it is ensured that when the depth calibration and positioning tool string is pulled out, the safety valve, sleeve and other downhole tools of the pipe string in the well are not scraped.

[0004] The technical solution adopted by the present invention to solve the technical problem is:

[0005] A continuous tubing depth calibration and positioning tool for a gas storage gas-tight pipe column, comprising a connected continuous tubing and a depth calibration and positioning pipe, wherein the continuous tubing is connected to a ground tubing vehicle, and the ground tubing vehicle is used to lower or lift the tool, inject pressure into the tool, and monitor tool load changes; the depth calibration and positioning pipe comprises an integrally arranged central shaft and an upper joint, wherein the central shaft and the outer wall of the upper joint are slidably sleeved with a male joint, and the outer wall of the bottom end of the male joint is connected to a female joint to form an outer cylinder; the outer wall of the central shaft is fixedly sleeved to contact the gas-tight The three-claw anchor shoe is located at the short-circuited reduced diameter part of the sexual pipe column, the female joint is sleeved on the outside of the three-claw anchor shoe, and the wall of the female joint is connected with a shear pin that is clamped with the three-claw anchor shoe; an extrusion cavity is formed between the outer tube, the central shaft and the three-claw anchor shoe, the extrusion cavity is communicated with the internal cavity of the central shaft, the shear pin is located in the extrusion cavity, and the force of cutting off the shear pin is transmitted from the internal cavity of the central shaft to the extrusion cavity. After the shear pin is cut off, the female joint can slide downward along the outer wall of the three-claw anchor shoe to store the three-claw anchor shoe into the outer tube.

[0006] Based on the above scheme, the coiled tubing is connected to the depth calibration positioning tube and lowered into the gas-tight tubing underground. The characteristic of the gas-tight tubing being seated and short-circuited is utilized. The surface tubing vehicle monitors the load change to determine the position of the seated short-circuit. The seated short-circuit position is calibrated by comparing with the completion casing data sheet, and the perforation depth of the coiled tubing is further corrected, thus achieving accurate depth calibration of the perforation section of the coiled tubing. At the same time, the shear pin is used as the cutting mechanism, which can ensure that the female joint slides along the three-claw anchor shoe after cutting, realize the storage of the three-claw anchor shoe, and ensure that the downhole tools of the tubing string will not be scratched when the tool is pulled out, thus ensuring the reliability and safety of the operation.

[0007] Furthermore, a hole communicating with the extrusion cavity is formed on the shaft body of the central shaft, and a cut-off diameter-changing port located below the hole is formed in the inner cavity of the central shaft, and the cut-off diameter-changing port is used to clamp a sealing steel ball dropped by the continuous oil pipe.

[0008] Based on the above scheme, when it is necessary to pull out the tool, a sealing steel ball is dropped into the center shaft through the continuous oil pipe, so that the sealing steel ball is sealed at the cut-off reducer, ensuring that the injection pressure from the ground oil pipe vehicle enters the extrusion chamber through the hole at this time, so that the downward force of the outer tube cuts off the shear pin, ensuring the downward movement of the outer tube.

[0009] Furthermore, the three-claw anchor shoe includes an integrally arranged end head and three downwardly extending anchor claws connected to the end head at equal intervals; the outer wall of the end head is provided with a convex edge which cooperates with the shear pin, the bottom of the lower claw end of the anchor claw has an inclined surface a, and the outer side of the lower claw end of the anchor claw is a trapezoidal boss formed by connecting the inclined surface b, the plane, and the inclined surface c in sequence, and the trapezoidal boss is used to contact the reduced diameter when the tool is lowered into the airtight pipe column and the short-circuited reduced diameter is located.

[0010] Based on the above scheme, the setting of the anchor claw enables the tool to accurately locate and contact the reduced diameter. The design of the trapezoidal boss can increase the contact area, so that the tool can more easily contact the reduced diameter when it is lowered to the reduced diameter. The three-claw anchor shoe adopts an integrated design. The overall structure is compact and firm and can withstand large loads and pressures.

[0011] Furthermore, the two inner bottom angles of the trapezoidal boss are 30° and 60° respectively.

[0012] Based on the above solution, it is possible to ensure that the area of ​​the contact surface between the trapezoidal boss and the reduced diameter is just right, avoiding the contact area being too small resulting in an unclear load change, and avoiding the contact area being too large resulting in a stuck contact with the reduced diameter.

[0013] Furthermore, it also includes an adjustment mechanism for adjusting the angle, outer diameter and elasticity of the three-claw anchor shoe. The adjustment mechanism includes a cone sleeve, a compression spring and a hexagonal washer which are sleeved on the outer wall of the central shaft and connected in sequence from top to bottom. The cone sleeve is threadedly connected to the outer wall of the central shaft, and the upper end of the cone sleeve has an inclined surface d which cooperates and abuts with the bottom inclined surface a of the lower claw end of the anchor claw.

[0014] Based on the above scheme, the adjustment mechanism provides the functions of adjusting the angle, outer diameter and elasticity of the three-claw anchor shoe. By twisting the cone sleeve to adjust the tightness of the contact between the cone sleeve and the three-claw anchor shoe, the angle and outer diameter of the three-claw anchor shoe relative to the center axis can be changed, and then the elastic force of the three-claw anchor shoe can be adjusted to meet the load signal requirements of the ground oil pipeline vehicle, improve the sensitivity of the tool over-seating short-circuit, and make the on-board data collection more obvious; at the same time, the design of the compression spring enables the three-claw anchor shoe to have a certain elasticity, which can adapt to slight deformation and changes inside the pipe string and improve the stability of positioning.

[0015] Furthermore, the adjustment mechanism also includes a positioning nut and a locking nut threadedly sleeved on the outer wall of the central shaft, the positioning nut is arranged below the hexagonal washer and abuts against the hexagonal washer to fix the position of the hexagonal washer; the locking nut is arranged below the positioning nut and abuts against the positioning nut to lock the position of the positioning nut; the positioning nut is provided with a radially arranged locking screw, and the locking nut is provided with a radially arranged fastening screw.

[0016] Based on the above solution, the positioning nut can fix the position of the hexagonal washer to ensure the stable connection between the adjustment mechanism and the center shaft. The locking nut locks the positioning nut in the desired position to prevent it from loosening and displacement during use, thereby improving the stability and reliability of the adjustment mechanism.

[0017] Furthermore, the inner wall of the end of the three-claw anchor shoe is fixedly connected to the outer wall of the central shaft through a clamping nut.

[0018] Furthermore, a plurality of O-rings are provided between the male joint, the central shaft and the upper joint.

[0019] Furthermore, the depth calibration and positioning method of the tool includes the following steps:

[0020] The depth calibration and positioning pipe is connected to the coiled tubing through its upper joint, and the coiled tubing is connected to the ground tubing vehicle. The coiled tubing and the depth calibration and positioning pipe are lowered into the gas-tight pipe column of the gas storage reservoir through the ground tubing. During the lowering process, the ground tubing vehicle always monitors the tool load pressure. When the three-claw anchor shoe contacts the short-circuit reduction of the gas-tight pipe column, the load pressure monitored by the ground tubing vehicle changes, and the position of the short-circuit is determined. At this time, a mark is made on the wellhead coiled tubing and the ground tubing is used to calibrate the wellhead coiled tubing. The vehicle presses into the extrusion cavity until the shear pin is cut off, and then the female joint together with the male joint slides downward to store the three-claw anchor shoe into the outer tube. After the three-claw anchor shoe is stored, the coiled tubing and the depth calibration positioning tube are lifted upward, and the depth calibration positioning tube is disassembled and separated from the coiled tubing. The perforating gun is connected to the marked coiled tubing and lowered into the gas-tight string of the gas storage reservoir. The mark on the coiled tubing is used as the reference line to control the lowering depth of the perforating gun. After the perforating gun is lowered to the preset depth, the perforating operation is carried out.

[0021] The beneficial effects of the present invention include:

[0022] In order to solve the problem of depth calibration and positioning of the gas-tight oil pipe in the gas storage reservoir, the present invention provides a depth calibration and positioning tool specially used for the gas-tight oil pipe to calibrate the position of the gas-tight oil pipe landing joint, and calibrate the landing short-circuit position by comparing with the completion casing data table. Then, the oil pipe is continued to be lowered to calibrate the perforation depth of the continuous oil pipe using the vehicle-mounted depth meter system. At the same time, it is ensured that when the depth calibration tool string is pulled out, the safety valve and sliding sleeve and other downhole tools in the well pipe are not scraped. The dedicated depth calibration and positioning tool for continuous tubing can complete precise depth calibration and perforation operations of the perforation section and layer filling and other processes without releasing pressure, suppressing the well, or removing the gas-tight pipe string from the original well, thereby achieving the purpose of adjusting the storage capacity of the gas storage well. It fills the technical gap of the lack of dedicated gas-tight pipe string depth calibration and positioning tools in China. It has the advantages of short well occupation period, high construction efficiency, and avoidance of well control risks. It is convenient for dynamic adjustment of gas storage capacity expansion, providing favorable technical guarantee for gas storage capacity expansion and supply guarantee, increasing the storage capacity of Liaohe Gas Storage, improving the scale of gas storage capacity, and improving the supply guarantee capacity of natural gas. It has significant economic benefits and certain social benefits. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 It is a schematic diagram of the overall structure of the present invention;

[0024] Figure 2 It is a schematic diagram of the central axis structure;

[0025] Figure 3 This is a schematic diagram of the overall structure of the three-claw anchor tile;

[0026] Figure 4This is a cross-sectional view of the three-claw anchor tile structure;

[0027] Figure 5 This is a top view of the three-claw anchor tile structure.

[0028] In the figure: 1-locking nut, 2-fastening screw, 3-positioning nut, 4-locking screw, 5-hexagonal washer, 6-compression spring, 7-taper sleeve, 8-three-claw anchor shoe, 9-female joint, 10-ferrule nut, 11-shear pin, 12 male joint, 13-O-ring, 14-center axis, 15-upper joint, 16-extrusion chamber, 17-hole, 18-cut-off reducer;

[0029] 8-1-end, 8-2-anchor claw, 8-3-convex edge, 8-4-inclined surface a, 8-5-trapezoidal boss. DETAILED DESCRIPTION

[0030] The technical solution of the present invention will be described clearly and completely below in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0031] In the description of the present invention, it should be noted that the orientations or positional relationships indicated by the terms "oblique", "flat", "inside", "outside", etc. are based on the orientations or positional relationships shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or component referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, the terms "a", "b", and "c" are only used to distinguish components, and cannot be understood as indicating or implying relative importance.

[0032] In addition, the technical features involved in the different embodiments of the present invention described below can be combined with each other as long as they do not conflict with each other.

[0033] Example 1

[0034] A continuous tubing depth calibration and positioning tool for a gas storage gas-tightness pipe column, wherein the depth calibration and positioning pipe is connected to the continuous tubing, and the continuous tubing is connected to a ground tubing vehicle, and the ground tubing vehicle is used to lower or lift the tool, inject pressure into the tool, and monitor the load change of the tool;

[0035] like Figure 1 As shown, the depth calibration and positioning tube includes an integrally arranged central axis 14 and an upper joint 15, the outer walls of the central axis 14 and the upper joint 15 are slidably connected to the male joint 12, and the outer wall of the bottom end of the male joint 12 is connected to the female joint 9 to form an outer tube; a plurality of O-rings 13 are arranged between the male joint 12 and the central axis 14 and the upper joint 15.

[0036] The outer wall of the central shaft 14 is fixedly sleeved by a sleeve nut 10 to contact the three-claw anchor shoe 8 located at the short-circuited reduction part of the airtight pipe column. The female joint 9 is sleeved on the outside of the three-claw anchor shoe 8 and a shear pin 11 that is clamped with the three-claw anchor shoe 8 is connected to the wall of the female joint 9; an extrusion cavity 16 is formed between the outer cylinder, the central shaft 14 and the three-claw anchor shoe 8, a hole 17 connected to the extrusion cavity 16 is opened on the shaft body of the central shaft 14, and a cut-off diameter reducing port 18 located below the hole 17 is provided in the internal cavity of the central shaft 14, and the cut-off diameter reducing port 18 is used to clamp the sealing steel ball dropped by the continuous oil pipe, the shear pin 11 is located in the extrusion cavity 16, and the force of cutting off the shear pin 11 is transmitted to the extrusion cavity 16 by the hole 17 of the central shaft 14. After the shear pin 11 is cut off, the female joint 9 can slide downward along the outer wall of the three-claw anchor shoe 8 to store the three-claw anchor shoe 8 into the outer cylinder.

[0037] refer to Figure 3-Figure 5 The three-claw anchor shoe 8 includes an integrally arranged end 8-1 and three downwardly extending anchor claws 8-2 connected to the end 8-1 at equal intervals; the outer wall of the end 8-1 is provided with a convex edge 8-3 that cooperates with the shear pin 11, and the bottom of the lower claw end of the anchor claw 8-2 has an inclined surface a8-4, and the outer side of the lower claw end of the anchor claw 8-2 is a trapezoidal boss 8-5 formed by connecting the inclined surface b, the plane, and the inclined surface c in sequence, and the trapezoidal boss 8-5 is used to contact the reduced diameter when the tool is lowered to the airtight pipe column and the short-circuited reduced diameter is located. Preferably, the two inner bottom angles of the trapezoidal boss 8-5 are 30° and 60° respectively, to prevent the contact area between the trapezoidal boss 8-5 and the reduced diameter from being too large or too small.

[0038] The tool also includes an adjustment mechanism for adjusting the angle, outer diameter and elasticity of the three-claw anchor shoe 8. The adjustment mechanism includes a tapered sleeve 7, a compression spring 6, a hexagonal washer 5, a positioning nut 3 and a locking nut 1, which are sleeved on the outer wall of the central shaft 14 and connected in sequence from top to bottom. The tapered sleeve 7 is threadedly connected to the outer wall of the central shaft 14, and the upper end of the tapered sleeve 7 has an inclined surface d that cooperates and abuts with the bottom inclined surface a8-4 of the lower claw end of the anchor claw 8-2; the positioning nut 3 is arranged below the hexagonal washer 5 and abuts against the hexagonal washer 5 to fix the position of the hexagonal washer 5; the locking nut 1 is arranged below the positioning nut 3 and abuts against the positioning nut 3 to lock the position of the positioning nut 3; a radially arranged locking screw 4 is passed through the positioning nut 3, and a radially arranged fastening screw 2 is passed through the locking nut 1.

[0039] The depth calibration and positioning method of the tool includes the following steps:

[0040] After adjusting the angle, outer diameter and elasticity of the three-claw anchor shoe 8 of the depth calibration positioning pipe through the adjustment mechanism, the depth calibration positioning pipe is connected to the coiled tubing through its upper joint 15, and the coiled tubing is connected to the ground tubing vehicle, and the coiled tubing and the depth calibration positioning pipe are lowered into the gas-tight pipe column of the gas storage reservoir through the ground tubing. During the lowering process, the ground tubing vehicle always monitors the tool load pressure. When the three-claw anchor shoe 8 contacts the short-circuit reduction point of the gas-tight pipe column, the load pressure monitored by the ground tubing vehicle changes, and the position of the short-circuit is determined. At this time, the wellhead coiled tubing is Make a mark, and use the ground tubing vehicle to pressurize the extrusion cavity 16 until the shear pin 11 is cut off, and then the female joint 9 together with the male joint 12 slides downward to store the three-claw anchor shoe 8 into the outer tube. After the three-claw anchor shoe 8 is stored, the coiled tubing and the depth calibration positioning tube are lifted upward, and the depth calibration positioning tube is disassembled and separated from the coiled tubing. The perforating gun is connected to the coiled tubing with the mark and lowered into the gas-tight pipe string of the gas storage reservoir. The mark on the coiled tubing is used as the reference line to control the lowering depth of the perforating gun. After the perforating gun is lowered to the preset depth, the perforating operation is carried out.

[0041] In summary, the working principle of the present invention is: the continuous oil pipe is connected to the depth calibration positioning pipe and lowered into the well, and the shrinking characteristic of the airtight oil pipe landing short circuit is utilized. When the three-claw anchor shoe 8 contacts the shrinking part, the position of the landing short circuit is determined by the change in the load monitored by the ground oil pipe vehicle; at the same time, the setting of the outer tube ensures that the downhole tool will not be scratched when the tool is lowered into the pipe string. By adjusting the elastic force of the three-claw anchor shoe, the load signal requirements of the ground oil pipe vehicle can be met, the sensitivity of the tool through the landing short circuit is improved, and the vehicle-mounted data collection is more obvious; by comparing the completion casing data table, the landing short circuit position is calibrated, and the continuous pipe perforation depth is further corrected, so as to realize the accurate depth calibration of the continuous pipe perforation section.

[0042] The research on the continuous tubing depth calibration and positioning tool specifically for the gas storage gas-tight oil pipe has been successful. The technical problem of accurate depth calibration and positioning of the 4-inch gas-tight pipe string in the oil field gas storage has been solved. The next step is to promote and apply it to the accurate positioning of 3.0-inch and 5.0-inch gas-tight pipe strings in the gas storage, which will facilitate the process requirements of reservoir transformation, gas layer expansion and other process requirements of gas storage wells.

[0043] At present, there is no special gas-tight pipe depth calibration and positioning tool in China. The dedicated continuous tubing depth calibration tool can accurately calibrate the position of the neck of the pipe column landing joint without releasing pressure, pressing the well, or pulling out the original well gas-tight pipe column. At the same time, the storage gamma tester is used to read the depth pulse signal of the continuous tubing vehicle, and the measured gamma curve is compared with the original formation gamma curve to further calibrate the perforation depth of the continuous tubing. At the same time, the design uses the outer cylinder to recover the anchor claw during pressure relief to prevent the sleeve and safety valve from being scraped when the tool string is pulled out. This special continuous tubing depth calibration tool is the first of its kind in China. It has a broad application prospect for accurate perforation under pressure and pipe drilling of gas-tight pipe columns in oilfield gas storage reservoirs, filling the domestic construction gap.

[0044] Application Example 1

[0045] Construction purpose: Double 035-20 well perforation with pressure through tubing

[0046] Pipe string structure: 2.0〃 coiled tubing + external connector + hydraulic safety joint + 94mm coiled tubing depth calibration and positioning tool; φ76mm perforating gun.

[0047] Construction process: Shuang 035-20 well is a key well in the gas storage reservoir. It is a directional well with a wellhead pressure of 20MPa. Since the well needs to complete the expansion and adjustment of the storage capacity, if perforation is required for expansion, the construction must be carried out without removing the original well string. The wellhead pressure is 20MPa and the formation pressure is 24.6MPa. This time, continuous tubing perforation operation is selected; continuous tubing is used to clear the well to the upper landing short section (2662.71m); the lower continuous tubing is used to wash the well to the artificial well bottom (2890m), and the liquid level is maintained at the wellhead; the perforation notice perforates the well section 2811.7-2832.1m, and the perforation operation is carried out at 17.4m / 3 layers; gas lift drainage is used to induce spraying production.

[0048] In order to accurately locate the perforation depth, this construction adopted a "double depth calibration" method, that is: while using a homemade continuous tubing depth calibration and positioning tool to calibrate the depth, a storage-type gamma tester for continuous tubing was used to calibrate the depth. By comparing and analyzing the high-speed acquisition of the load / depth curve and the measured curve of the gamma tester ground test, it was found that this perforation construction was accurate to within 0.5 meters of the target layer.

[0049] Obviously, the above embodiments are merely examples for the purpose of clear explanation, and are not intended to limit the implementation methods. For those skilled in the art, other different forms of changes or modifications can be made based on the above description. It is not necessary and impossible to list all the implementation methods here. The obvious changes or modifications derived therefrom are still within the scope of protection of the invention.

Claims

1. A coiled tubing depth calibration and positioning tool for a gas storage gas-tight pipe column, characterized in that: The invention comprises a continuous oil pipe and a depth calibration and positioning pipe which are connected to each other. The continuous oil pipe is connected to a surface oil pipe vehicle which is used to lower or lift a tool, inject pressure into the tool and monitor the load change of the tool. The depth calibration and positioning pipe comprises an integrally arranged central shaft (14) and an upper joint (15). The outer walls of the central shaft (14) and the upper joint (15) are slidably sleeved with a male joint (12). The outer wall of the bottom end of the male joint (12) is connected with a female joint (9) to form an outer cylinder. The outer wall of the central shaft (14) is fixedly sleeved with a three-claw anchor shoe (8) which is used to contact the airtight pipe column at the short-circuit reduction position. The female joint (9) is sleeved on the three-claw anchor shoe. A shear pin (11) that is engaged with the three-claw anchor shoe (8) is connected to the wall of the female joint (9) outside the shoe (8); an extrusion cavity (16) is formed between the outer cylinder, the central shaft (14) and the three-claw anchor shoe (8); the extrusion cavity (16) is communicated with the internal cavity of the central shaft (14); the shear pin (11) is located in the extrusion cavity (16); a force for cutting the shear pin (11) is transmitted from the internal cavity of the central shaft (14) to the extrusion cavity (16); after the shear pin (11) is cut off, the female joint (9) can slide downward along the outer wall of the three-claw anchor shoe (8) to store the three-claw anchor shoe (8) in the outer cylinder.

2. A coiled tubing depth calibration and positioning tool for a gas storage gas-tight pipe column according to claim 1, characterized in that: The central shaft (14) is provided with a hole (17) in communication with the extrusion chamber (16), and the inner cavity of the central shaft (14) is provided with a flow-cutting variable-diameter opening (18) located below the hole (17), and the flow-cutting variable-diameter opening (18) is used for clamping a sealing steel ball dropped into the continuous oil pipe.

3. The coiled tubing depth calibration and positioning tool for a gas storage gas-tight pipe column according to claim 1, characterized in that: The three-claw anchor shoe (8) comprises an integrally arranged end head (8-1) and three downwardly extending anchor claws (8-2) connected to the end head (8-1) at equal intervals; the outer wall of the end head (8-1) is provided with a convex edge (8-3) engaged with a shear pin (11); the bottom of the lower claw end of the anchor claw (8-2) has an inclined surface a (8-4); the outer side of the lower claw end of the anchor claw (8-2) is a trapezoidal boss (8-5) formed by connecting an inclined surface b, a plane, and an inclined surface c in sequence; the trapezoidal boss (8-5) is used to contact the reduced diameter when the tool is lowered to the short-circuited reduced diameter of the airtight pipe column.

4. A coiled tubing depth calibration and positioning tool for a gas storage gas-tight pipe column according to claim 3, characterized in that: The two inner bottom angles of the trapezoidal boss (8-5) are 30° and 60° respectively.

5. The coiled tubing depth calibration and positioning tool for a gas storage gas-tight pipe column according to claim 3 is characterized in that: The invention also comprises an adjusting mechanism for adjusting the angle, outer diameter and elasticity of the three-claw anchor shoe (8), the adjusting mechanism comprising a cone sleeve (7) which is sleeved on the outer wall of the central shaft (14) and connected in sequence from top to bottom, a compression spring (6) and a hexagonal washer (5), the cone sleeve (7) being threadedly connected to the outer wall of the central shaft (14), and the upper end of the cone sleeve (7) having an inclined surface d which cooperates and abuts against the inclined surface a (8-4) at the bottom of the lower claw end of the anchor claw (8-2).

6. A coiled tubing depth calibration and positioning tool for a gas storage gas-tight pipe column according to claim 5, characterized in that: The adjustment mechanism further comprises a positioning nut (3) and a locking nut (1) which are threadedly sleeved on the outer wall of the central shaft (14); the positioning nut (3) is arranged below the hexagonal washer (5) and abuts against the hexagonal washer (5) to fix the position of the hexagonal washer (5); the locking nut (1) is arranged below the positioning nut (3) and abuts against the positioning nut (3) to lock the position of the positioning nut (3); a radially arranged locking screw (4) is passed through the positioning nut (3), and a radially arranged fastening screw (2) is passed through the locking nut (1).

7. A coiled tubing depth calibration and positioning tool for a gas storage gas-tight pipe column according to claim 3, characterized in that: The inner wall of the end (8-1) of the three-claw anchor shoe (8) is fixedly connected to the outer wall of the central shaft (14) via a clamping nut (10).

8. The coiled tubing depth calibration and positioning tool for a gas storage gas-tight pipe column according to claim 1, characterized in that: A plurality of O-type sealing rings (13) are provided between the male joint (12), the central shaft (14) and the upper joint (15).

9. A coiled tubing depth calibration and positioning tool for a gas storage gas-tight pipe column according to any one of claims 1 to 8, characterized in that: The depth calibration and positioning method of the tool includes the following steps: The depth calibration and positioning pipe is connected to the coiled tubing through its upper joint (15), and the coiled tubing is connected to the ground tubing vehicle. The coiled tubing and the depth calibration and positioning pipe are lowered into the gas-tight pipe column of the gas storage reservoir through the ground tubing vehicle. During the lowering process, the ground tubing vehicle always monitors the tool load pressure. When the three-claw anchor shoe (8) contacts the short-circuit reduction point of the gas-tight pipe column, the load pressure monitored by the ground tubing vehicle changes, and the position of the short-circuit is determined. At this time, a mark is made on the wellhead coiled tubing, and the ground tubing vehicle is used to push the tool into the extrusion chamber (1 6) Pressurize the inner part until the shear pin (11) is cut off, and then the female joint (9) together with the male joint (12) slides downward to store the three-claw anchor shoe (8) in the outer tube. After the three-claw anchor shoe (8) is stored, the coiled tubing and the depth calibration positioning tube are lifted upward, and the depth calibration positioning tube is disassembled and separated from the coiled tubing. The perforating gun is connected to the coiled tubing with the mark and lowered into the gas storage reservoir gas tightness string. The mark on the coiled tubing is used as a reference line to control the lowering depth of the perforating gun. After the perforating gun is lowered to the preset depth, the perforating operation is carried out.

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