Well shaft water intercepting device for freezing method shaft sinking

Abstract

The invention relates to the technical field of shaft construction structures, and discloses a freezing method shaft sinking shaft water intercepting device which comprises an annular device shell, a through opening is formed in the middle of the inner side of the annular device shell, welding columns are evenly distributed on the inner side face of the annular device shell, and lifting rings are installed at the upper ends of the welding columns. A plurality of sets of hydraulic supporting structures are evenly installed in the annular device shell outwards, and a hydraulic oil cylinder is horizontally fixed in the annular device shell. According to the freezing method shaft sinking shaft water intercepting device, an air pump is used for inflating the annular water intercepting air bag through the air guide pipe, so that the annular water intercepting air bag begins to expand after being inflated and becomes an annular ring body, and an expansion telescopic part obviously expands outwards till the annular periphery abuts against the shaft wall; the sealing ring is fully attached to the wall of the shaft to form annular sealing, the sealing effect is good, and when leaking water of the shaft flows downwards along the wall of the shaft, the leaking water is blocked by the annular water intercepting air bag in time.

Description

Technical Field

[0001] The invention relates to the technical field of shaft construction structures, and in particular to a shaft water cut-off device for drilling a well using a freezing method. Background Art

[0002] The mine shaft is the main channel for mine ventilation, equipment transportation, and ore transportation. It is called the throat of the mine and is usually an inclined shaft or a vertical shaft. Due to the complex geological conditions, it is often necessary to cross aquifers when building the shaft. After completion, the shaft will have varying degrees of water seepage, and even water gushing will occur. The seepage and gushing will affect the construction environment in the shaft, and personnel will also be splashed when riding in tanks and entering and exiting cages, and the drainage burden at the bottom of the well will be increased. The corrosive seepage will corrode the equipment in the mine, shorten the service life of the equipment, and reduce construction safety. Therefore, it is necessary to intercept the shaft seepage and add water interception facilities to guide the splashing water into the middle section and then into the drainage system for discharge to the outside.

[0003] The existing water interception method is to install a water interception trough on the inner wall of the well to intercept water, and then discharge the water into the bottom of the well through a pipe to improve the working environment of the well. However, most of the existing water interception troughs are fixed to the inner wall of the well with resin anchor rods. The drilling depth is large, which is easy to cause damage to the well and reduce the strength of the well concrete structure. Secondly, this anchoring structure is not removable and cannot be adjusted according to the needs of use, which increases the construction cost. In addition, the seepage water is prone to contain mud and particulate matter. After silting up in the water interception trough, it will cause blockage of the water interception trough and the sewer pipe.

[0004] In summary, considering that the existing facilities cannot meet the work needs, we propose a water cut-off device for well drilling using the freezing method. Summary of the invention

[0005] The main purpose of the present invention is to provide a freezing method well drilling water cut-off device, which can effectively solve the problems in the background technology.

[0006] To achieve the above object, the technical solution adopted by the present invention is: A water cut-off device for drilling a well using the freezing method comprises an annular device shell, a through opening is opened at the middle position of the inner side of the annular device shell, welding columns are evenly distributed on the inner side surface of the annular device shell, and lifting rings are installed on the upper ends of the welding columns. The number of welding columns and lifting rings is preferably 4-6 groups. Several groups of hydraulic support structures are evenly installed outside the interior of the annular device shell, and the number of the hydraulic support structures is preferably 4 groups.

[0007] As a preferred solution of a wellbore water cut-off device for a freezing method of well drilling described in the present invention, the hydraulic support structure includes a hydraulic cylinder, a hydraulic telescopic column, a movable seat, a curved support plate, an L-shaped bracket and a positioning recessed piece. The hydraulic cylinder is horizontally fixed inside the annular device shell, and a hydraulic telescopic column is movably provided inside the hydraulic cylinder extending outward, and a movable seat is welded to the end of the hydraulic telescopic column. A limiting groove for the linear movement of the movable seat is provided on the outer side surface of the annular device shell, and a curved support plate in contact with the wall of the wellbore is welded to the end of the movable seat away from the hydraulic telescopic column, and an L-shaped bracket is fixed to the upper end surface of the movable seat, and a positioning recessed piece is riveted to the upper end of the L-shaped bracket.

[0008] As a preferred solution of the freezing method well drilling water cut-off device described in the present invention, the upper end of each group of the positioning concave plates is commonly connected to an annular water cut-off air bag, the upper end of the annular water cut-off air bag is provided with a diversion slope, the outer side surface of the annular water cut-off air bag is glued with a sealing ring acting on the wall of the wellbore, and the area on the outer side surface of the annular water cut-off air bag is an expansion and contraction part.

[0009] As a preferred solution of the freezing method well drilling water cut-off device described in the present invention, wherein: air pumps are evenly installed inside the annular device shell, the number of the air pumps is preferably 2-4 groups, the exhaust port of the air pump is connected to an air guide pipe, the air guide pipe is located on the inner side of the annular device shell, a one-way valve is installed on the air guide pipe, the upper end of the air guide pipe is connected to a bellows expansion tube, the end of the bellows expansion tube is connected to the inner side of the annular water cut-off air bag, and a pressure relief valve is installed on the annular water cut-off air bag.

[0010] As a preferred solution of the freezing method well drilling water cut-off device described in the present invention, a water storage tank is provided on the upper end face of the annular device shell, and two groups of drainage outlets are provided at the bottom of the water storage tank penetrating the annular device shell, and a joint is installed at the lower end of the drainage outlet, and the drainage outlet is connected to a long drainage pipe through the joint, and the long drainage pipe extends downward along the wall of the wellbore until it extends into the drainage ditch of the horse head gate, and the number of the long drainage pipes is 2 groups.

[0011] As a preferred solution of the freezing method well drilling water cut-off device described in the present invention, an annular rack is arranged around the top edge of the water storage tank, an annular guide rail is arranged around the inner wall of the water storage tank, a slide groove is opened in the middle position of the upper and lower end surfaces of the annular guide rail, and an annular mud scraper is installed in the slide groove.

[0012] As a preferred solution of the freezing method well drilling water cut-off device described in the present invention, the annular scraper includes a scraper drive seat, a scraper plate, a clamp, a scraper head, a curved connecting port and a limit slider. A scraper plate is fixed by a clamp at the middle position of the lower end surface of the scraper drive seat, and a scraper head acting on the bottom of the water storage tank is arranged at the lower end of the scraper plate. A curved connecting port extending into the annular guide rail is formed on the outer side surface of the scraper drive seat, and a limit slider is symmetrically installed on the upper and lower end surfaces of the curved connecting port. The limit slider extends into the slide groove and moves in a circle in the slide groove.

[0013] As a preferred solution of the freezing method well drilling water cut-off device described in the present invention, the annular scraper also includes a positioning shaft, an intermediate bearing, a traveling gear and a connecting gear. The positioning shafts are symmetrically distributed in two groups. The positioning shafts extend upward from the inside of the scraper drive seat. The middle part of the positioning shaft is fixed by the intermediate bearing and the inner wall of the scraper drive seat. The upper end of each group of the positioning shafts is equipped with a traveling gear meshing with an annular rack. The number of the traveling gears is 2 groups, and the lower end of each group of the positioning shafts is sleeved with a connecting gear.

[0014] As a preferred solution of the freezing method well drilling water cut-off device described in the present invention, the two groups of connecting gears are meshed with the changing gears, the two groups of connecting gears rotate in the same direction, the changing gears are sleeved on the output shaft of the uniform speed motor, and the uniform speed motor is vertically fixed inside the mud scraper drive seat.

[0015] As a preferred solution of the freezing method well drilling water cut-off device described in the present invention, wherein: a large gear is rotatably arranged at the lower position inside the annular device shell, and gear grooves are symmetrically opened on the upper and lower end surfaces of the large gear. A guide block extending into the gear groove is fixedly arranged inside the annular device shell, and the number of the guide blocks is 2-4 groups. A driving gear is meshed with the outer teeth of the large gear, and the driving gear is sleeved on the output shaft of the servo motor. Four groups of automatic interceptors are evenly distributed on the inner teeth of the large gear, and a falling object monitoring sensor is installed in the wellbore.

[0016] As a preferred embodiment of the freezing method well drilling water cut-off device described in the present invention, the automatic interceptor includes a rotating gear, a rotating shaft, a bearing seat, an extension rod, an elastic pull rope, a rope buckle and an interception net, each group of the rotating gears is meshed with the inner teeth of the large gear, the rotating gear is sleeved on the middle part of the rotating shaft, the upper and lower ends of the rotating shaft are fixed by the bearing seat and the inner wall of the annular device shell, an extension rod is welded on the rotating shaft and below the rotating gear, a storage groove acting on the extension rod is provided on the inner side surface of the annular device shell, an elastic pull rope is fixed to the end of the extension rod away from the rotating shaft, the end of the elastic pull rope is fixed by the rope buckle and the groove wall of the storage groove, an interception net is arranged between the elastic pull rope and the extension rod, and the interception net is retractable.

[0017] As a preferred solution of the freezing method well drilling water cut-off device described in the present invention, each group of hydraulic cylinders is connected to an oil pipe group, including an oil inlet pipe and an oil return pipe, and the oil pipe group is uniformly connected to an oil supply tank, and the oil supply tank is installed on the annular device shell or the wellbore wall.

[0018] As a preferred solution of the freezing method well drilling water cut-off device described in the present invention, the driving gear is located in the motor seat, the motor seat is fixed in the middle of the outer side surface of the annular device shell, and the servo motor is arranged to penetrate the upper end surface of the annular device shell.

[0019] As a preferred solution of the freezing method wellbore water cut-off device of the present invention, the annular water cut-off airbag is retractable.

[0020] As a preferred solution of the freezing method well drilling water cut-off device described in the present invention, the lifting ring is connected to the hook of the crane.

[0021] As a preferred solution of the freezing method well drilling water cut-off device described in the present invention, the length of the mud scraper head is matched with the cross-sectional width of the water storage tank.

[0022] The present invention provides a freezing method wellbore water cut-off device through improvement, which has the following significant improvements and advantages compared with the prior art: (1) Oil is supplied to several groups of hydraulic cylinders at the same time, and the hydraulic telescopic column extends outward, driving the moving seat to move, so that the curved support plate slowly approaches the wall of the wellbore until an extrusion force is generated. Several groups of curved support plates form a ring-shaped support state, ensuring that the shell of the ring-shaped device is fixed, which can be flexibly installed and disassembled and used multiple times, thereby reducing costs.

[0023] (2) Use an air pump to pump air into the annular water-cutting airbag through the air guide tube, so that the annular water-cutting airbag begins to expand after being inflated and becomes an annular ring body. The expanded and retractable part obviously expands outward until the entire ring contacts the wellbore wall. The sealing ring and the wellbore wall are fully fitted to form an annular seal with good sealing effect. When the leaking water of the wellbore flows downward along the wall, it is blocked in time by the annular water-cutting airbag. After accumulation, it flows downward along the diversion slope and drips into the water storage tank below to be temporarily stored, thereby achieving the purpose of automatic water cutoff and high flexibility.

[0024] (3) Start the uniform speed motor regularly to drive the direction-changing gear to rotate, and then drive the coaxial travel gear to rotate through a series of transmissions. The travel gear also interacts with the annular rack, causing the limit slider of the annular scraper to move in a circular motion in the slide groove, thereby driving the entire annular scraper to move at a low speed along the annular guide rail. The scraper head at the lower end of the scraper blade is used to scrape off the remaining mud in the water storage tank to prevent it from silting up, thereby achieving the effect of automatic silting, and guiding the mud into the drain outlet, where it is discharged downward from the long drain pipe together with the water flow, thereby preventing the drain pipe from clogging due to excessive accumulation of mud.

[0025] (4) After a falling object occurs, the monitoring sensor controls the servo motor to work immediately. After a series of transmissions, the rotation of the large gear causes the four sets of rotating gears on the inner side to work synchronously, causing the rotating shaft to rotate clockwise, driving the extension rod to swing outward from the storage slot. The interception net that was originally in a stacked state is immediately spread out and located in the passage. After being spread out, the four sets of interception nets cover most of the area of ​​the passage, intercepting the falling objects, achieving the effect of automatic interception, reducing property losses, and ensuring the safety of staff. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 It is a schematic diagram of the overall structure of a water cut-off device for a wellbore using a freezing method according to the present invention; Figure 2 It is a schematic diagram of the external structure of the shell of the annular device of the present invention; Figure 3 This is a schematic diagram of the external connection of the annular water-cutting airbag of the present invention; Figure 4 It is a schematic diagram of the specific structure of the hydraulic support structure of the present invention; Figure 5 is an enlarged schematic diagram of the water storage tank of the present invention; Figure 6 It is a schematic diagram of the external structure of the annular mud scraper of the present invention in one direction; Figure 7 It is a schematic diagram of the external structure of the annular mud scraper of the present invention in another direction; Figure 8 It is a schematic diagram of the internal driving structure of the mud scraper driving seat of the present invention; Fig. 9 This is a schematic diagram of the overall structure of the device according to the second embodiment of the present invention; Fig.10 It is a schematic diagram of the connection of the large gear in one direction of the present invention; Fig.11 This is a schematic diagram of the connection of the large gear in another direction of the present invention; Fig.12 It is a schematic diagram of the specific structure of the automatic object cutter of the present invention.

[0027] In the figure: 1, annular device housing; 2, through port; 3, welding column; 4, lifting ring; 7, hydraulic support structure; 71, hydraulic cylinder; 72, hydraulic telescopic column; 73, moving seat; 74, curved support plate; 75, L-shaped bracket; 76, positioning concave piece; 8, annular scraper; 80, scraper driving seat; 81, scraper plate; 82, clip; 83, scraper head; 84, curved connection port; 85, limit slider; 86, positioning shaft; 87, intermediate bearing; 88, travel gear; 89, connecting gear; 9, automatic interceptor; 91, rotating gear; 92, rotating shaft; 93, bearing seat; 94. Extension rod; 95. Elastic pull rope; 96. Rope buckle; 97. Intercepting net; 10. Annular water-intercepting airbag; 11. Diversion slope; 12. Sealing ring; 20. Air pump; 21. Air guide tube; 22. Corrugated telescopic tube; 30. Water storage tank; 31. Drain outlet; 32. Joint; 33. Long drain pipe; 40. Annular guide rail; 41. Slide groove; 42. Annular rack; 50. Large gear; 51. Gear rotation groove; 52. Driving gear; 53. Servo motor; 60. Limiting groove; 61. Oil pipe group; 62. Changing gear; 63. Constant speed motor; 64. Motor seat; 65. Storage groove. DETAILED DESCRIPTION

[0028] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. 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.

[0029] Embodiment 1 like Figure 1-8 As shown, this embodiment provides a water cut-off device for drilling a well by freezing method, including an annular device shell 1, a through hole 2 is opened at the inner middle position of the annular device shell 1, the through hole 2 is used for the normal up and down operation of the well, the inner side surface of the annular device shell 1 is evenly distributed with welding columns 3, the upper end of the welding column 3 is installed with a lifting ring 4, the lifting ring 4 is connected to the hook of the crane, and the lifting ring 4 is evenly distributed to ensure that the whole device can be lifted and placed stably.

[0030] Furthermore, a plurality of hydraulic support structures 7 are evenly installed outside the inner part of the annular device housing 1, such as Figure 1-3 shown.

[0031] Specifically, the hydraulic support structure 7 includes a hydraulic cylinder 71, a hydraulic telescopic column 72, a movable seat 73, a curved support plate 74, an L-shaped bracket 75 and a positioning concave sheet 76. Figure 4 shown.

[0032] In this embodiment, the hydraulic cylinder 71 is horizontally fixed inside the annular device housing 1, and a hydraulic telescopic column 72 is movably provided inside the hydraulic cylinder 71 to extend outward, and a moving seat 73 is welded to the end of the hydraulic telescopic column 72. A limiting groove 60 for the linear movement of the moving seat 73 is provided on the outer side surface of the annular device housing 1. The two are matched in size and play a role of limiting guidance.

[0033] In this embodiment, a curved support plate 74 in contact with the wall of the wellbore (the curvature of the curved support plate 74 is close to the curvature of the wellbore) is welded to the end of the movable seat 73 away from the hydraulic telescopic column 72, and the initial position of the curved support plate 74 is close to the wall of the wellbore. An L-shaped bracket 75 is fixed to the upper end surface of the movable seat 73, and a positioning recess 76 is riveted to the upper end of the L-shaped bracket 75.

[0034] Furthermore, the upper end of each group of positioning concave sheets 76 is commonly connected to an annular water-cutting airbag 10, which plays a role in connection and positioning. The annular water-cutting airbag 10 is retractable and is made of a rubber airbag material, such as Figure 1-3 shown.

[0035] Specifically, a diversion slope 11 is provided at the upper end of the annular water-cutting airbag 10, and a sealing ring 12 is glued to the outer side of the annular water-cutting airbag 10 to act on the wall of the wellbore to play a waterproof role. The sealing ring 12 can also be expanded and contracted. The area on the outer side of the annular water-cutting airbag 10 is an expansion and contraction part, and the expansion and contraction sensitivity of the expansion and contraction part is higher than that of other areas, such as Figure 3 shown.

[0036] Furthermore, an air pump 20 is evenly installed inside the annular device shell 1, and the exhaust port of the air pump 20 is connected to an air guide pipe 21, which is located on the inner side of the annular device shell 1. A one-way valve is installed on the air guide pipe 21, and the upper end of the air guide pipe 21 is connected to a bellows telescopic tube 22, and the end of the bellows telescopic tube 22 is connected to the inner side of the annular water-cutting airbag 10. The bellows telescopic tube 22 can be stretched linearly, and a pressure relief valve is installed on the annular water-cutting airbag 10, which is used to release the air in the annular water-cutting airbag 10.

[0037] Furthermore, a water storage tank 30 is provided on the upper end surface of the annular device housing 1. Figure 3 shown.

[0038] The bottom of the water storage tank 30 penetrates the annular device housing 1 and is provided with two sets of drainage ports 31. A joint 32 is installed at the lower end of the drainage port 31. The drainage port 31 is connected to a long drainage pipe 33 through the joint 32. The long drainage pipe 33 extends downward along the wall of the well shaft until it extends into the drainage ditch of the horse head gate. Figure 1 and 2 shown.

[0039] Among them, an annular rack 42 is arranged around the top edge of the water storage tank 30, an annular guide rail 40 is arranged around the inner wall of the water storage tank 30, and a slide groove 41 is opened in the middle position of the upper and lower end surfaces of the annular guide rail 40, and an annular scraper 8 is installed in the slide groove 41. Figure 5 shown.

[0040] Specifically, the annular scraper 8 includes a scraper drive seat 80, a scraper plate 81, a clip 82, a scraper head 83, a curved connection port 84 and a limit slider 85. Figure 6 and 7 shown.

[0041] In this embodiment, a scraper plate 81 is fixed at the middle position of the lower end surface of the scraper drive seat 80 by a clip 82. The scraper plate 81 can be removed and replaced. A scraper head 83 acting on the bottom of the water tank 30 is provided at the lower end of the scraper plate 81. The length of the scraper head 83 is adapted to the cross-sectional width of the water tank 30. A curved connecting port 84 extending into the annular guide rail 40 is provided on the outer side surface of the scraper drive seat 80. A limiting slider 85 is symmetrically installed on the upper and lower end surfaces of the curved connecting port 84. The limiting slider 85 extends into the slide groove 41 and moves in a circle in the slide groove 41, which has a limiting effect.

[0042] Furthermore, the annular scraper 8 also includes a positioning shaft 86, an intermediate bearing 87, a travel gear 88 and a connecting gear 89, as shown in FIG. Figure 6-8 shown.

[0043] In this embodiment, there are two groups of symmetrically distributed positioning shafts 86. The positioning shafts 86 extend upward from the inside of the scraper drive seat 80. The middle part of the positioning shafts 86 is fixed by the intermediate bearing 87 and the inner wall of the scraper drive seat 80. The upper end of each group of positioning shafts 86 is installed with a traveling gear 88 meshing with the annular rack 42, and the lower end of each group of positioning shafts 86 is sleeved with a connecting gear 89.

[0044] The two sets of connecting gears 89 mesh with the direction-changing gear 62, and the two sets of connecting gears 89 rotate in the same direction. The direction-changing gear 62 is sleeved on the output shaft of the uniform speed motor 63, and the uniform speed motor 63 is vertically fixed inside the scraper driving seat 80, such as Figure 8 shown.

[0045] Furthermore, each group of hydraulic cylinders 71 is connected to an oil pipe group 61, including an oil inlet pipe and an oil return pipe. The oil pipe group 61 is uniformly connected to an oil supply tank, which is installed on the annular device housing 1 or on the wall of the wellbore. Figure 4 shown.

[0046] When the present embodiment is in use, the multiple sets of lifting rings 4 on the hook connection device of the crane are first used, and then the entire device is lifted and lowered into the wellbore, and stopped at a designated position after balancing, and then the oil supply tank is supplied with oil, so that several sets of hydraulic cylinders 71 are simultaneously supplied with oil, and the hydraulic telescopic columns 72 extend outward, driving the movable seat 73 to move outward of the limit groove 60 (the L-shaped bracket 75 on the movable seat 73 moves accordingly, so that the annular water-cutting airbag 10 is also stretched in each centrifugal direction), so that the curved support plate 74 slowly approaches the wellbore wall until an extrusion force is generated, and several sets of curved support plates 74 form an annular support state to ensure that the annular device shell 1 is fixed, and then the lifting rope and hook of the crane are withdrawn.

[0047] At this time, several groups of air pumps 20 are started to pump air into the annular water-cutting airbag 10 through the air guide tube 21, so that the annular water-cutting airbag 10 begins to expand after being inflated, and the surface becomes smooth (from a wrinkled state to a bulged state), and becomes an annular ring body. The expanded and retractable part obviously expands outward until the entire ring contacts the wellbore wall, and the sealing ring 12 and the wellbore wall are fully fitted to form an annular seal. When the leaking water of the wellbore flows downward along the wall, it is blocked in time by the annular water-cutting airbag 10 (cannot continue to penetrate downward), and after accumulation, it flows downward along the diversion slope 11, drips into the water storage tank 30 below and is temporarily stored, and is discharged from the two groups of drainage ports 31, enters the long drainage pipe 33, and flows downward in a concentrated manner and is finally injected into the drainage ditch of the horse head gate.

[0048] The uniform speed motor 63 is started regularly to drive the direction-changing gear 62 to rotate. The direction-changing gear 62 is meshed with the two sets of connecting gears 89 respectively, so that the two sets of connecting gears 89 rotate in the same direction, driving the coaxial traveling gear 88 to rotate. The two sets of traveling gears 88 act on the annular rack 42 at the same time, causing the limiting slider 85 of the annular scraper 8 to move in a circle in the slide groove 41, thereby driving the entire annular scraper 8 to move at a low speed along the annular guide rail 40 (the movement range covers the entire water storage tank 30), and the scraper head 83 at the lower end of the scraper blade 81 contacts the bottom of the water storage tank 30 to scrape off the remaining mud stains in the water storage tank 30 to prevent them from silting up. When the scraper blade 81 passes through the drain outlet 31 during movement, the mud stains are introduced into the drain outlet 31 and discharged downward from the long drain pipe 33 together with the water flow.

[0049] Embodiment 2 On the basis of the first embodiment, when the coal mine or tools are hoisted up and down in the shaft, accidental falling objects are prone to occur, causing property losses and even endangering the personal safety of the staff. In order to solve the above technical problems, we have the following design, such as Figure 9-12 shown.

[0050] Specifically, a large gear 50 is rotatably arranged at the lower position inside the annular device housing 1, and a gear rotation groove 51 is symmetrically opened on the upper and lower end surfaces of the large gear 50. A guide block extending into the gear rotation groove 51 is fixedly arranged inside the annular device housing 1, and the two fit together and move relative to each other. Figure 10-11 shown.

[0051] Among them, a driving gear 52 is meshed with the outer teeth of the large gear 50, and the driving gear 52 is sleeved on the output shaft of the servo motor 53. The driving gear 52 is located in the motor seat 64 and extends into the annular device housing 1. The motor seat 64 is fixed to the middle of the outer side surface of the annular device housing 1, and the servo motor 53 is arranged through the upper end surface of the annular device housing 1. Figure 10-11 shown.

[0052] Among them, four groups of automatic interceptors 9 are evenly distributed on the inner teeth of the large gear 50, and a falling object monitoring sensor is installed in the wellbore to monitor the situation in the wellbore in real time, such as Fig.10 shown.

[0053] Specifically, the automatic interceptor 9 includes a rotating gear 91, a rotating shaft 92, a bearing seat 93, an extension rod 94, an elastic pull rope 95, a rope buckle 96 and an interception net 97. Fig.12 shown.

[0054] In this embodiment, each set of rotating gears 91 is meshed with the internal teeth of the large gear 50, and the rotating gears 91 are sleeved on the middle part of the rotating shaft 92. The upper and lower ends of the rotating shaft 92 are fixed by the bearing seat 93 and the inner wall of the annular device shell 1. An extension rod 94 is welded on the rotating shaft 92 and located below the rotating gears 91.

[0055] In this embodiment, a storage groove 65 acting on the extension rod 94 is opened on the inner side surface of the annular device shell 1, and the storage groove 65 is used to store the extension rod 94 and the interception net 97. An elastic pull rope 95 is fixed to the end of the extension rod 94 away from the rotating shaft 92, and the end of the elastic pull rope 95 is fixed by a rope buckle 96 and the groove wall of the storage groove 65. An interception net 97 is arranged between the elastic pull rope 95 and the extension rod 94. The interception net 97 is retractable and is made of pressure-resistant and wear-resistant material.

[0056] When the present embodiment is in use, after a falling object occurs above the wellbore, the monitoring sensor timely captures the information data and controls the servo motor 53 to work immediately, the driving gear 52 rotates, and the large gear 50 is decelerated and rotated by meshing. When the large gear 50 rotates, the rotating gears 91 on the four groups of automatic interceptors 9 on the inner side are caused to work synchronously, and the rotating shaft 92 is rotated clockwise respectively, driving the extension rod 94 to swing outward from the receiving groove 65. During the movement, the extension rod 94 pulls the elastic pull rope 95 to stretch it, and the interception net 97 originally in a stacked state is immediately spread out and is located in the through opening 2. After the four groups of interception nets 97 are spread out, they cover most of the area of ​​the through opening 2, and the falling falling objects are intercepted in time; let the driving gear 52 rotate in the opposite direction, and after a series of transmissions, the rotating shaft 92 drives the extension rod 94 back to the receiving groove 65. Under the action of the return elastic force of the extension rod 94 and the elastic pull rope 95, the interception net 97 is retracted into the receiving groove 65.

[0057] It should be noted that, in this article, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device.

[0058] Although 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 present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A water cut-off device for a wellbore using a freezing method, comprising an annular device housing (1), characterized in that: A through opening (2) is provided at the middle position of the inner side of the annular device shell (1); welding columns (3) are evenly distributed on the inner side surface of the annular device shell (1); a lifting ring (4) is installed on the upper end of the welding column (3); and a plurality of groups of hydraulic support structures (7) are evenly installed outside the inner side of the annular device shell (1); The hydraulic support structure (7) comprises a hydraulic cylinder (71), a hydraulic telescopic column (72), a movable seat (73), a curved support plate (74), an L-shaped bracket (75) and a positioning concave plate (76); the hydraulic cylinder (71) is horizontally fixed inside the annular device housing (1); a hydraulic telescopic column (72) is movably provided inside the hydraulic cylinder (71) and extending outward; the movable seat (73) is welded to the end of the hydraulic telescopic column (72); a limiting groove (60) for linear movement of the movable seat (73) is provided on the outer side surface of the annular device housing (1); a curved support plate (74) in contact with the wellbore wall is welded to one end of the movable seat (73) away from the hydraulic telescopic column (72); an L-shaped bracket (75) is fixed to the upper end surface of the movable seat (73); and a positioning concave plate (76) is riveted to the upper end of the L-shaped bracket (75).

2. A freezing method wellbore water cut-off device according to claim 1, characterized in that: The upper end of each group of positioning concave sheets (76) is commonly connected to an annular water-cutting airbag (10), the upper end of the annular water-cutting airbag (10) is provided with a diversion slope (11), the outer side surface of the annular water-cutting airbag (10) is glued with a sealing ring (12) acting on the wall of the wellbore, and the area on the outer side surface of the annular water-cutting airbag (10) is an expansion and expansion portion.

3. A freezing method wellbore water cut-off device according to claim 2, characterized in that: An air pump (20) is evenly installed inside the annular device housing (1); an exhaust port of the air pump (20) is connected to an air guide pipe (21); the air guide pipe (21) is located on the inner side of the annular device housing (1); a one-way valve is installed on the air guide pipe (21); an upper end of the air guide pipe (21) is connected to a bellows expansion pipe (22); an end of the bellows expansion pipe (22) is connected to the inner side of the annular water-cutting airbag (10); and a pressure relief valve is installed on the annular water-cutting airbag (10).

4. A freezing method well drilling water cut-off device according to claim 1, characterized in that: A water storage tank (30) is provided on the upper end surface of the annular device shell (1), and two sets of drainage ports (31) are provided at the bottom of the water storage tank (30) penetrating the annular device shell (1). A joint (32) is installed at the lower end of the drainage port (31), and the drainage port (31) is connected to a long drainage pipe (33) via the joint (32). The long drainage pipe (33) extends downward along the wall of the well shaft until it extends into the drainage ditch of the horse head gate.

5. A freezing method wellbore water cut-off device according to claim 4, characterized in that: An annular rack (42) is arranged around the top edge of the water storage tank (30), an annular guide rail (40) is arranged around the inner wall of the water storage tank (30), a slide groove (41) is provided at the middle position of the upper and lower end surfaces of the annular guide rail (40), and an annular mud scraper (8) is installed in the slide groove (41).

6. A freezing method well drilling water cut-off device according to claim 5, characterized in that: The annular scraper (8) comprises a scraper drive seat (80), a scraper plate (81), a clip (82), a scraper head (83), a curved connection port (84) and a limit slider (85). The scraper plate (81) is fixed to the middle position of the lower end surface of the scraper drive seat (80) via the clip (82). The scraper head (83) acting on the bottom of the water storage tank (30) is arranged at the lower end of the scraper plate (81). The outer side surface of the scraper drive seat (80) is provided with a curved connection port (84) extending into the annular guide rail (40). The limit slider (85) is symmetrically mounted on the upper and lower end surfaces of the curved connection port (84). The limit slider (85) extends into the slide groove (41) and moves in a circular motion in the slide groove (41).

7. A freezing method wellbore water cut-off device according to claim 6, characterized in that: The annular scraper (8) further comprises a positioning shaft (86), an intermediate bearing (87), a traveling gear (88) and a connecting gear (89). The positioning shaft (86) comprises two groups which are symmetrically distributed. The positioning shaft (86) extends upward through the interior of the scraper drive seat (80). The middle portion of the positioning shaft (86) is fixed by the intermediate bearing (87) and the inner wall of the scraper drive seat (80). The upper end of each group of the positioning shafts (86) is provided with a traveling gear (88) meshing with the annular rack (42), and the lower end of each group of the positioning shafts (86) is sleeved with a connecting gear (89).

8. A freezing method well drilling water cut-off device according to claim 7, characterized in that: The two groups of connecting gears (89) are meshed with the direction-changing gear (62) and rotate in the same direction. The direction-changing gear (62) is sleeved on the output shaft of the constant-speed motor (63). The constant-speed motor (63) is vertically fixed inside the mud scraper drive seat (80).

9. A freezing method wellbore water cut-off device according to claim 1, characterized in that: A large gear (50) is rotatably arranged at a lower position inside the annular device housing (1), and gear grooves (51) are symmetrically provided on the upper and lower end surfaces of the large gear (50). A guide block extending into the gear groove (51) is fixedly arranged inside the annular device housing (1), and a driving gear (52) is meshed with the outer teeth of the large gear (50), and the driving gear (52) is sleeved on the output shaft of the servo motor (53). Four groups of automatic interceptors (9) are evenly distributed on the inner teeth of the large gear (50), and a falling object monitoring sensor is installed in the wellbore.

10. A freezing method wellbore water cut-off device according to claim 9, characterized in that: The automatic interceptor (9) comprises a rotating gear (91), a rotating shaft (92), a bearing seat (93), an extension rod (94), an elastic pull rope (95), a rope buckle (96) and an interception net (97). Each set of the rotating gears (91) meshes with the inner teeth of the large gear (50). The rotating gears (91) are sleeved on the middle part of the rotating shaft (92). The upper and lower ends of the rotating shaft (92) are fixed by the bearing seat (93) and the inner wall of the annular device housing (1). The rotating shaft (92) is provided with a rotating gear (91). An extension rod (94) is welded below the rotating gear (91); a storage groove (65) acting on the extension rod (94) is provided on the inner side surface of the annular device housing (1); an elastic pull rope (95) is fixed to the end of the extension rod (94) away from the rotating shaft (92); the end of the elastic pull rope (95) is fixed by a rope buckle (96) and the groove wall of the storage groove (65); a material interception net (97) is provided between the elastic pull rope (95) and the extension rod (94); the material interception net (97) is retractable.

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