Cutting, forging and milling device for old well casing of gas storage

Abstract

The invention relates to the technical field of gas storage old well casing pipe forging and milling, in particular to a gas storage old well casing pipe cutting, forging and milling device which comprises a full well section sleeve, a section sealing flow guide mechanism arranged in the full well section sleeve, a forging and milling mechanism arranged on the section sealing flow guide mechanism and a kinetic energy conversion assembly arranged between the section sealing flow guide mechanism and the forging and milling mechanism. The sealing section flow guide mechanism comprises two flow guide pipes, flow cylinders arranged in the two flow guide pipes, and traction rods movably mounted in the flow cylinders. The forging and milling mechanism is arranged under the sealing section flow guide mechanism, the forging and milling mechanism pushed by high-pressure water flow can be matched with the inner wall of the full well section sleeve to expand outwards along with continuous injection of filtering and washing liquid along the sealing section flow guide mechanism, and finally, the selected part of the full well section sleeve can be subjected to constant-pressure ring cutting along with high-speed rotation of the forging and milling mechanism. And disintegrating slag in the ring cutting period can be effectively emptied by the liquid pumping pipe inserted into the full-well section sleeve under the reverse pushing action of water pressure, so that the device is prevented from being blocked in the forging and milling cutting period.

Description

Technical Field

[0001] The invention relates to the technical field of forging and milling casings of old wells in gas storage facilities, and in particular to a device for cutting, forging and milling casings of old wells in gas storage facilities. Background Art

[0002] Gas storage wells require frequent changes in operating conditions and withstand high-intensity alternating loads during operation, placing high demands on cementing quality. However, since most wells used in gas storage facilities are older, cementing quality often fails to meet construction requirements. Casing forging and milling can reseal unsatisfactory well sections, ensuring the safe and efficient operation of the gas storage facility. However, there are still certain disadvantages in the forging and milling of old well casing. The operation of traditional forging and milling equipment requires the cooperation of drilling fluid. However, as the forging and milling of the old well casing continues, the drilling fluid will become more viscous. In addition, when the forging and milling equipment applies uneven pressure to the old well casing, the casing will collapse due to cutting defects. Both of these will cause the forging and milling equipment to get stuck.

[0003] In view of this, a gas storage old well casing cutting, forging and milling device was designed to solve the above problems. Summary of the Invention

[0004] The present invention aims to solve one of the technical problems existing in the prior art or related art.

[0005] To this end, the technical solution adopted in the present invention is: A gas storage old well casing cutting forging and milling device includes a full well section casing, a sealing section flow guide mechanism arranged in the full well section casing, a forging and milling mechanism arranged on the sealing section flow guide mechanism, and a kinetic energy conversion component arranged between the sealing section flow guide mechanism and the forging and milling mechanism; the sealing section flow guide mechanism includes two drainage pipes, a flow cylinder arranged in the two drainage pipes, a traction rod movably installed in the flow cylinder, a sub-floating pad installed at the top of the traction rod, a base installed at the bottom end of the traction rod and a pressure-bearing end installed on the base; the kinetic energy conversion component includes an impeller and a fixed end installed in the impeller; the forging and milling mechanism includes a reinforced casing installed outside the fixed end, and the outer wall of the reinforced casing is provided with a limiting groove, a milling cutter carrier movably installed in the limiting groove and a milling cutter installed at the outer end of the milling cutter carrier.

[0006] In a preferred embodiment of the present invention, the forging and milling mechanism may further include a bottom plate mounted on the bottom end of the reinforcing sleeve, a correction inner tube movably mounted inside the bottom plate, a protective sleeve mounted on the top end of the correction inner tube, a cushion mounted on the outside of the protective sleeve, two sealing rings disposed on the outside of the cushion, a main floating pad disposed on the bottom end of the correction inner tube, and a plurality of external frames movably mounted on the main floating pad. A chuck is installed on the inner side of the bottom end of the milling cutter carrier, and the top end of the outer frame is movably installed on the chuck.

[0007] In a preferred embodiment of the present invention, the forging and milling mechanism may further include a shield disposed at the bottom of the main floating pad and a pipe blocking pad installed at the bottom end of the deviation-correcting inner pipe and extending outside the shield, wherein a vertical groove is formed at the top of the pipe blocking pad; The outer side wall of the bottom end of the pipe blocking pad is provided with uniformly distributed anti-slip protrusions.

[0008] In a preferred example, the present invention can be further configured as follows: the sealing and guiding mechanism also includes a ring buckle arranged on the outside of the two drainage tubes, two clamps installed between the drainage tubes and the reinforcement sleeves, and four locking bolts installed in the two clamps.

[0009] In a preferred embodiment of the present invention, the sealing and guiding mechanism may be further configured as follows: the sealing and guiding mechanism further includes a washer mounted on the traction rod and extending into the shield, and two anti-slip plates mounted on the bottom of the washer; The anti-slip plate is used to provide straightening constraints for the outward expansion of the pipe plugging pad.

[0010] In a preferred example, the present invention can be further configured as follows: two semicircular slots are opened inside the gasket, and the top end of the pipe blocking gasket passes through the two semicircular slots.

[0011] In a preferred embodiment of the present invention, the kinetic energy conversion assembly may be further configured as follows: the kinetic energy conversion assembly further includes a shield mounted in the two drainage tubes, the top of the shield being provided with a drainage slot, and the core rod being movably mounted in the shield; A limiting through hole adapted to guide the traction rod is provided inside the fixed end head.

[0012] In a preferred example, the present invention can be further configured as follows: a plurality of evenly distributed drainage grooves are opened on the top of the reinforcing sleeve, and the fixed end is fixed on the inner wall of the reinforcing sleeve, and the plurality of drainage grooves are located directly above the inclined surface of the fixed end.

[0013] In a preferred example, the present invention can be further configured as follows: the bottom end of the reinforcing sleeve is provided with evenly distributed trapezoidal grooves, and the trapezoidal grooves are connected to the limiting grooves, and the top end of the outer frame is adapted to pass through the trapezoidal grooves.

[0014] In a preferred example, the present invention can be further configured as follows: a vertical hole constrained by the traction rod is opened inside the deviation-correcting inner tube.

[0015] By adopting the above technical solution, the beneficial effects achieved by the present invention are as follows: 1. The present invention arranges a forging and milling mechanism directly below the sealing and diverting mechanism. As the filtrate and washing liquid is continuously injected into the sealing and diverting mechanism, the forging and milling mechanism driven by the high-pressure water flow can adapt to the inner wall of the full-section casing and expand outward. With the high-speed rotation of the forging and milling mechanism, the selected part of the full-section casing can finally be cut with constant pressure. The debris during the cutting process will be effectively drained by the pumping pipe inserted into the full-section casing under the reverse thrust of the water pressure, thereby avoiding obstruction of the forging and milling cutting of the device.

[0016] 2. The present invention applies an outward extrusion pressure to the pipe plugging pad through the sealing section diversion mechanism and the filtrate and washing liquid until the pipe plugging pad is compressed and completely adheres to the inner wall of the full-section casing. At this time, the multiple milling cutters that are compressed and stretched out will continue to apply pressure to the inner wall of the full-section casing. After the filtrate and washing liquid surges back and carries the debris out of the cutting seam, the selected part of the full-section casing can be more efficiently circumcised.

[0017] 3. The present invention arranges a pressure-bearing end head and a base at the bottom of the pipe plugging pad. When the pressure-bearing end head and the base cooperate with two anti-slip plates to apply external tension to the pipe plugging pad, the stretched pipe plugging pad can be quickly clamped on the inner wall of the entire well casing. At this time, multiple milling cutters distributed with the pipe plugging pad as the center can be centered along the entire well casing, thereby ensuring the stability of the device during forging and milling. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 This is a schematic diagram of the present invention when in front use; Figure 2 It is a three-dimensional schematic diagram of the present invention; Figure 3 This is an exploded schematic diagram of the sealing and guiding mechanism of the present invention; Figure 4 For the present invention Figure 3 Explosion diagram of Figure 5 It is a partial schematic diagram of the present invention; Figure 6 is a schematic diagram of a kinetic energy conversion component of the present invention; Figure 7 Schematic diagram of the forging and milling mechanism of the present invention; Figure 8 For the present invention Figure 7 Explosion diagram.

[0019] Reference numerals: 100, full well section casing; 200, sealing section flow diversion mechanism; 210, drainage pipe; 220, buckle; 230, clamp; 2301, locking bolt; 240, flow tube; 250, traction rod; 2501, pressure-bearing end; 2502, base; 2503, sub-floating pad; 260, washer; 2601, anti-slip plate; 300, kinetic energy conversion assembly; 310, shield; 320, core rod; 330, impeller; 340, fixed end; 350, limit through hole; 400, forging and milling mechanism; 410, reinforcing sleeve; 4101, drainage trough; 4102, limiting groove; 420, milling cutter carrier; 4201, milling cutter; 4202, chuck; 430, bottom plate; 440, outer frame; 450, main floating pad; 460, protective cover; 470, pipe blocking pad; 4701, vertical groove; 480, correction inner tube; 4801, protective sleeve; 4802, gasket; 4803, sealing ring. DETAILED DESCRIPTION

[0020] To make the purpose, technical solutions and advantages of the present invention more clear, the present invention is further described in detail below in conjunction with specific embodiments and with reference to the accompanying drawings. It should be noted that the embodiments of the present invention and the features therein can be combined with each other without conflict.

[0021] It is to be understood that these descriptions are illustrative only and are not intended to limit the scope of the invention.

[0022] A gas storage old well casing cutting, forging and milling device provided by some embodiments of the present invention will be described below with reference to the accompanying drawings.

[0023] Example 1: Combine Figures 1 to 8 As shown, the present invention provides a gas storage old well casing cutting, forging and milling device, which includes a full-section casing 100, a sealing section flow guide mechanism 200 arranged in the full-section casing 100, a forging and milling mechanism 400 arranged on the sealing section flow guide mechanism 200, and a kinetic energy conversion component 300 arranged between the sealing section flow guide mechanism 200 and the forging and milling mechanism 400. The sealing section flow guide mechanism 200 is used to directly transport the filtrate and washing liquid, and the kinetic energy conversion component 300 provides auxiliary rotation energy with the help of the filtrate and washing liquid level forging and milling mechanism 400. The rotating forging and milling mechanism 400 is used to cut and forge selected parts in the full-section casing 100.

[0024] The sealing section flow diversion mechanism 200 includes two drainage tubes 210, a flow tube 240 disposed within the two drainage tubes 210, a traction rod 250 movably mounted within the flow tube 240, a sub-floating pad 2503 mounted on the top of the traction rod 250, a base 2502 mounted on the bottom of the traction rod 250, and a pressure-bearing end 2501 mounted on the base 2502. The kinetic energy conversion assembly 300 includes an impeller 330, a fixed end 340 mounted in the impeller 330, a shield 310 mounted in the two drainage tubes 210, and a drainage slot is formed at the top of the shield 310. A core rod 320 is movably mounted in the shield 310. A limiting through hole 350 adapted to guide the traction rod 250 is opened inside the fixed end 340; The forging and milling mechanism 400 includes a reinforcing sleeve 410 mounted on the outside of the fixed end 340, and a limiting groove 4102 is defined on the outer wall of the reinforcing sleeve 410, a milling cutter carrier 420 movably mounted in the limiting groove 4102, a milling cutter 4201 mounted on the outer end of the milling cutter carrier 420, a bottom plate 430 mounted on the bottom end of the reinforcing sleeve 410, a deflection correction inner tube 480 movably mounted inside the bottom plate 430, a sheath 4801 mounted on the top end of the deflection correction inner tube 480, a gasket 4802 mounted on the outside of the sheath 4801, two sealing rings 4803 disposed on the outside of the gasket 4802, a main floating pad 450 disposed at the bottom end of the deflection correction inner tube 480, and a plurality of external frames 440 movably mounted on the main floating pad 450; A chuck 4202 is mounted on the inner side of the bottom end of the milling cutter carrier 420 , and the top end of the outer frame 440 is movably mounted on the chuck 4202 .

[0025] After the filtrate and washing liquid is input through the two drainage pipes 210, it will be transferred along the inner cavity of the flow tube 240. Finally, the filtrate and washing liquid will push the sub-floating pad 2503, the traction rod 250 and the base 2502 upward first, and the pressure-bearing end 2501 will apply a squeezing force to the plugging pad 470. Finally, the pressurized plugging pad 470 will expand outward. As the water pressure continues and stabilizes, the expanded plugging pad 470 will be pressed against the inner wall of the full-section casing 100, and the selected cutting part of the full-section casing 100 can be sealed. As the filtrate and washing liquid passes through the protective cover 310 and promotes the rotation of the impeller 330 and the fixed end 340, the reinforced casing 410 installed on the outside of the fixed end 340 will rotate at a uniform speed, and the multiple milling cutter carriers 420 and multiple milling cutters 4201 evenly distributed outside the reinforced casing 410 will perform constant pressure ring cutting on the inner wall of the entire well section casing 100. The debris that falls after the ring cutting will be subjected to the reverse pressure of the filtrate and washing liquid, and will rise along the inner cavity of the entire well section casing 100. Finally, the rising debris and filtrate and washing liquid will be effectively extracted by the liquid extraction pipe.

[0026] Example 2: Combine Figures 1 to 8 As shown, based on Example 1, the forging and milling mechanism 400 further includes a shield 460 provided at the bottom of the main floating pad 450 and a pipe blocking pad 470 installed at the bottom end of the deviation-correcting inner tube 480 and extending to the outside of the shield 460, and a vertical groove 4701 is provided at the top of the pipe blocking pad 470; The outer side wall of the bottom end of the pipe blocking pad 470 is provided with uniformly distributed anti-slip protrusions; The top of the reinforcing sleeve 410 is provided with multiple drainage grooves 4101 evenly distributed, and the fixed end 340 is fixed to the inner wall of the reinforcing sleeve 410, and the multiple drainage grooves 4101 are located directly above the inclined surface of the fixed end 340; The bottom end of the reinforcing sleeve 410 is provided with evenly distributed trapezoidal grooves, which are connected to the limiting groove 4102, and the top end of the outer frame 440 is adapted to penetrate into the trapezoidal grooves; A vertical hole constrained by the traction rod 250 is opened inside the deviation-correcting inner tube 480 .

[0027] Preferably, a hollow cavity is provided inside the main floating pad 450. As the filtrate and washing liquid continues to flow down until it passes through the pipe plugging pad 470, the debris from the forging and milling of the inner wall of the casing 100 of the entire well section will be pushed upward in the opposite direction. As the multiple milling cutter carriers 420 and milling cutters 4201 are extended outward at the same angle, the multiple milling cutters 4201 in a high-speed rotating state will perform constant pressure cutting, forging and milling on the inner wall of the entire well section casing 100, thereby avoiding the collapse of the selected parts of the entire well section casing 100 due to uneven pressure on the cutting, forging and milling parts.

[0028] Example 3: Combine Figures 3 to 8 As shown, based on Example 1, the sealing and guiding mechanism 200 further includes a ring buckle 220 provided on the outside of the two drainage tubes 210, two clamps 230 installed between the drainage tubes 210 and the reinforcing sleeve 410, four locking bolts 2301 installed in the two clamps 230, a washer 260 installed on the traction rod 250 and extending into the shield 460, and two anti-slip plates 2601 installed at the bottom of the washer 260; The anti-slip plate 2601 is used to provide straightening constraints for the outward expansion of the pipe plugging pad 470; Two semicircular slots are formed inside the gasket 260 , and the top end of the pipe blocking gasket 470 passes through the two semicircular slots.

[0029] Preferably, a U-shaped reflux chamber is provided inside the flow tube 240. When the filtrate and washing liquid enters the U-shaped reflux chamber, the water pressure is transferred through the flow tube 240 to the chamber where the drainage pipe 210 and the reinforcement sleeve 410 are connected. At this time, the high-pressure filtrate and washing liquid helps to rotate the impeller 330 and the fixed end head 340. Finally, the reinforcement sleeve 410 installed outside the fixed end head 340 drives the multiple milling cutters 4201 to cut the inner wall of the casing 100 of the entire well section. As the filtrate passes through the pipe plugging pad 470 and applies an upward thrust to the main floating pad 450, the multiple external frames 440 connected to the main floating pad 450 will push the multiple milling cutter carriers 420 to continuously change their angles, and finally the multiple milling cutters 4201 will continuously perform circumferential cutting on the inner wall of the entire well casing 100.

[0030] The working principle and use process of the present invention are as follows: the device is placed in advance at a selected position in the inner cavity of the full-well casing 100, and the liquid extraction pipe is inserted deep into the full-well casing 100; Then, the filtrate and washing liquid is input into the inner cavity of the drainage tube 210, and finally the filtrate and washing liquid enters the inner cavity of the flow tube 240. Under the guidance of the reflux of the inner cavity of the flow tube 240, the filtrate and washing liquid will push the sub-floating pad 2503 and the traction rod 250 upward in the reverse direction, and the pressure-bearing end 2501 and the base 2502 provided at the bottom end of the traction rod 250 will apply an upward squeezing force to the pipe plugging pad 470. Under the limiting constraints of the gasket 260 and the two anti-slip plates 2601, the bottom end of the pipe plugging pad 470 will continue to approach the inner wall of the full-well casing 100 until the expanded pipe plugging pad 470 is pressed tightly into the full-well casing 100. At this time, the selected forging and milling part of the full-well casing 100 can be sealed. As the filtrate and washing liquid are continuously injected, the impeller 330 boosted by the water pressure will drive the fixed end head 340 to rotate, and the reinforced casing 410 fixed to the outside of the fixed end head 340 will also maintain high-speed rotation. As the filtrate and washing liquid reversely surges after passing through the pipe plugging pad 470, the main floating pad 450 will be lifted upward under the further push of the water pressure, and the main floating pad 450 will push the multiple outer frames 440 to expand outward. Finally, the multiple evenly distributed milling cutter carriers 420 and milling cutters 4201 will approach the inner wall of the full-well casing 100. At this time, the multiple milling cutters 4201 that have been expanded outward will forge and cut the inner wall of the full-well casing 100. During the cutting process, the multiple milling cutter carriers 420 and milling cutters 4201 that are continuously pressurized will be pressed and further penetrate into the cutting seam. This process can effectively avoid the collapse caused by uneven pressure on the well wall, and the subsequent problem of obstruction of the rotation of multiple evenly distributed milling cutters 4201 due to collapse. At the same time, the filtrate after back pressure pushes the impurities in the forging and milling parts of the entire well section 100 upward, and the external liquid pumping pipe can quickly extract the filtrate and impurities, thereby avoiding interference with the forging and milling cutting of the device.

[0031] Although the embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the invention, and that the scope of the invention is defined by the claims and their equivalents.

Claims

1. A gas storage old well casing cutting, forging and milling device, comprising a full well casing (100), characterized in that: It also includes a sealing section flow guiding mechanism (200) disposed in the full well section casing (100), a forging and milling mechanism (400) disposed on the sealing section flow guiding mechanism (200), and a kinetic energy conversion component (300) disposed between the sealing section flow guiding mechanism (200) and the forging and milling mechanism (400); The sealing section flow guiding mechanism (200) comprises two drainage tubes (210), a flow tube (240) disposed in the two drainage tubes (210), a traction rod (250) movably mounted inside the flow tube (240), a sub-floating pad (2503) mounted on the top end of the traction rod (250), a base (2502) mounted on the bottom end of the traction rod (250), and a pressure-bearing end (2501) mounted on the base (2502); The kinetic energy conversion assembly (300) includes an impeller (330) and a fixed end (340) installed in the impeller (330); The forging and milling mechanism (400) comprises a reinforcing sleeve (410) mounted on the outside of a fixed end head (340), wherein the outer wall of the reinforcing sleeve (410) is provided with a limiting groove (4102), a milling cutter carrier (420) movably mounted in the limiting groove (4102), and a milling cutter (4201) mounted on the outer end of the milling cutter carrier (420).

2. A gas storage old well casing cutting, forging and milling device according to claim 1, characterized in that: The forging and milling mechanism (400) further comprises a bottom plate (430) mounted on the bottom end of the reinforcing sleeve (410), a deviation-correcting inner tube (480) movably mounted inside the bottom plate (430), a protective sleeve (4801) mounted on the top end of the deviation-correcting inner tube (480), a cushion (4802) mounted on the outside of the protective sleeve (4801), two sealing rings (4803) disposed on the outside of the cushion (4802), a main floating pad (450) disposed at the bottom end of the deviation-correcting inner tube (480), and a plurality of external frames (440) movably mounted on the main floating pad (450); A chuck (4202) is installed on the inner side of the bottom end of the milling cutter carrier (420), and the top end of the outer frame (440) is movably installed on the chuck (4202).

3. The gas storage old well casing cutting, forging and milling device according to claim 1 is characterized in that: The forging and milling mechanism (400) further includes a shield (460) disposed at the bottom of the main floating pad (450) and a pipe blocking pad (470) installed at the bottom end of the deviation-correcting inner tube (480) and extending to the outside of the shield (460), wherein a vertical groove (4701) is formed at the top end of the pipe blocking pad (470); Uniformly distributed anti-slip protrusions are provided on the outer side wall of the bottom end of the pipe blocking pad (470).

4. The gas storage old well casing cutting, forging and milling device according to claim 1 is characterized in that: The sealing segment diversion mechanism (200) further comprises a ring buckle (220) arranged outside the two drainage tubes (210), two clamping members (230) installed between the drainage tubes (210) and the reinforcing sleeve (410), and four locking bolts (2301) installed in the two clamping members (230).

5. The gas storage old well casing cutting, forging and milling device according to claim 1 is characterized in that: The sealing section flow guiding mechanism (200) further comprises a washer (260) mounted on the traction rod (250) and extending through the shield (460), and two anti-slip plates (2601) mounted on the bottom of the washer (260); The anti-slip plate (2601) is used to provide straightening constraints for the outward expansion of the pipe plugging pad (470).

6. The gas storage old well casing cutting, forging and milling device according to claim 5, characterized in that: Two semicircular slots are provided inside the gasket (260), and the top end of the pipe blocking gasket (470) extends beyond the two semicircular slots.

7. The gas storage old well casing cutting, forging and milling device according to claim 1 is characterized in that: The kinetic energy conversion assembly (300) further includes a shield (310) installed in the two drainage tubes (210), wherein a drainage slot is provided at the top of the shield (310), and a core rod (320) is movably installed in the shield (310); A limiting through hole (350) adapted to guide the traction rod (250) is provided inside the fixed end head (340).

8. The device for cutting, forging and milling casing of an old well of a gas storage facility according to claim 1, characterized in that: The top of the reinforcing sleeve (410) is provided with a plurality of evenly distributed drainage grooves (4101), and the fixed end (340) is fixed on the inner wall of the reinforcing sleeve (410), and the plurality of drainage grooves (4101) are located directly above the inclined surface of the fixed end (340).

9. The gas storage old well casing cutting, forging and milling device according to claim 1, characterized in that: The bottom end of the reinforcing sleeve (410) is provided with evenly distributed trapezoidal grooves, and the trapezoidal grooves are connected to the limiting grooves (4102), and the top end of the outer frame (440) is adapted to penetrate into the trapezoidal grooves.

10. The gas storage old well casing cutting, forging and milling device according to claim 2, characterized in that: A vertical hole constrained by the traction rod (250) is provided inside the deviation-correcting inner tube (480).

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