Pressure sealing hole water stopper for geological drilling hole

Abstract

The utility model relates to the field of geological drilling hole water stoppers, and discloses a pressure sealing hole water stopper for a geological drilling hole, which comprises a drill pipe column reducer union, an expansion ball component, a pressure sealing ring and a pressure sealing ring, and is characterized in that one end of the drill pipe column reducer union is used for connecting a drill pipe column, and the outer side wall of the drill pipe column reducer union is sleeved with the expansion ball component; the expansion ball assembly can freely stretch out and draw back in the axis direction of the drill pipe column reducer union and achieve shrinkage and expansion in the radial direction of the drill pipe column reducer union, and the expansion ball assembly is used for selectively achieving sealing between the expansion ball assembly and a sleeve on the peripheral side. And the non-return component is detachably connected with the other end of the drill pipe column reducer union and is used for realizing one-way flow of cement towards the non-return component along the drill pipe column reducer union. When in use, the drill pipe column reducer union and the non-return component are placed in the casing pipe and are compressed and expanded by the expansion ball assembly, so that the expansion ball assembly is abutted between the drill pipe column reducer union and the casing pipe, and cement can be prevented from flowing out from the space between the drill pipe column reducer union and the casing pipe.

Description

Technical Field

[0001] The utility model relates to the field of water stoppers for geological drilling holes, in particular to a pressure-sealed hole water stopper for geological drilling holes. Background Art

[0002] The pressure-sealed hole water stopper for geological drilling holes is an important drilling auxiliary equipment, which is used to seal the gap between the drill pipe and the hole wall during the drilling process, prevent the intrusion of water and mud, and ensure the smooth progress of the drilling work.

[0003] The patent with the publication number CN213953556U discloses a pressure-sealed hole water stopper for geological drilling holes. By setting a U-shaped frame, a baffle and a connecting rod, when the phenomenon of water flow back height occurs, the water flow squeezes the baffle upward through the inner cavity of the inner pipe, and the baffle blocks the communication between the inner cavity of the drill pipe string reducer joint and the inner cavity of the inner pipe, so that the water flow cannot return to a high level. At the same time, the elastic rubber sleeve is subjected to the upward pressure of the water flow, so that the elastic rubber sleeve expands and fits tightly with the inner wall of the outer pipe, and the water cannot return to a high level through the inner cavity of the outer pipe.

[0004] Generally, during the geological drilling process, a casing pipe is required to protect the drilling hole, prevent the wellhead from collapsing, and provide additional support in complex strata. The casing pipe plays a crucial role in protecting and supporting during geological drilling. However, in the above scheme, the inner pipe and the outer pipe (i.e., the casing pipe) are set to be detachable. During the process of injecting cement into the drilling hole through the drill pipe string, the elastic rubber sleeve does not fit tightly with the inner side wall of the outer pipe, and at this time, the cement slurry is likely to show the phenomenon of back height from the inner cavity of the outer pipe.

[0005] In view of this, when the inner pipe and the outer pipe are set to be detachably connected, during the cementing operation, how to effectively control the back height of the cement during the process of injecting cement has become a technical problem that needs to be solved urgently by those skilled in the art. Summary of the Utility Model

[0006] The utility model aims to provide a pressure-sealed hole water stopper for geological drilling holes to overcome the above deficiencies.

[0007] In order to achieve the above object, the technical solution of the utility model is as follows:

[0008] The pressure-sealed hole water stopper for geological drilling holes includes:

[0009] A drill pipe string reducer joint, one end of which is used to connect the drill pipe string. An expansion ball assembly is sleeved on the outer side wall of the drill pipe string reducer joint. The expansion ball assembly can freely expand and contract along the axis direction of the drill pipe string reducer joint, and realize contraction and expansion along the radial direction of the drill pipe string reducer joint, so as to selectively seal with the surrounding casing pipe; and

[0010] A check component detachably connected to the other end of the drill pipe string reducer joint, and the check component is used to enable the cement to flow unidirectionally along the drill pipe string reducer joint towards the check component.

[0011] Further, the expansion ball assembly includes:

[0012] An expansion ball sleeved on the outer side wall of the drill pipe string reducer joint;

[0013] A fixing ring fixedly connected to one end of the expansion ball close to the check component, and the fixing ring is fixedly connected to the outer side wall of the drill pipe string reducer joint; and

[0014] A driving ring abutted against one end of the expansion ball away from the check component, the driving ring is movably connected to the outer side wall of the drill pipe string reducer joint, and the driving ring and the fixing ring approach and separate from each other, and can respectively realize the expansion and contraction of the expansion ball in the radial direction of the drill pipe string reducer joint.

[0015] Further, the expansion ball assembly further includes:

[0016] A stop ring fixedly connected to one end of the expansion ball away from the check component, the stop ring is slidably connected to the outer side wall of the drill pipe string reducer joint, the stop ring is located between the fixing ring and the driving ring, and the stop ring abuts against the driving ring; and

[0017] A plurality of first reinforcement rings are further fixedly connected to the outer side wall of the expansion ball, and the plurality of first reinforcement rings are located between the fixing ring and the stop ring and are arranged at equal intervals.

[0018] Further, an external thread is provided on the outer side wall of the drill pipe string reducer joint, an internal thread adapted to the external thread is provided on the inner side wall of the driving ring, and the driving ring is threadedly connected to the outer side wall of the drill pipe string reducer joint.

[0019] Further, a lock is further included, and the lock includes an operation ring movably sleeved on the periphery of the drill pipe string, and a plurality of operation rods arranged at circumferential intervals along the axis direction of the drill pipe string. One end of the operation rod is fixedly connected to the operation ring, and a plurality of blind holes corresponding to the operation rods one by one are provided on the end surface of the driving ring away from the stop ring, and the other end of the operation rod is detachably connected to the blind hole.

[0020] Further, a plurality of second reinforcement rings are arranged at intervals along the length direction of the operation rod, the second reinforcement rings are sleeved on the periphery of the drill pipe string, and the second reinforcement rings are fixedly connected to the plurality of operation rods.

[0021] Further, the check component includes:

[0022] A check valve detachably connected to the other end of the drill pipe string reducer joint, the inner side wall of the check valve is provided with a tapered sealing port, and the tapered tip of the sealing port faces the drill pipe string reducer joint;

[0023] A sealing head that is slidably connected in the radial direction of the check valve and is tapered, and the sealing head selectively closes or opens the sealing port; and

[0024] An elastic component for driving the sealing head to move towards the sealing port.

[0025] Further, the elastic component includes:

[0026] A water-permeable plate fixedly connected inside the check valve, the water-permeable plate is located on the side of the sealing port away from the drill pipe string reducer joint, the water-permeable plate is provided with a central through hole and a plurality of water-permeable holes, and the inner side wall of the central through hole extends along the side close to the sealing port to form a sliding sleeve, and the plurality of water-permeable holes are arranged at circumferential intervals along the axis of the sliding sleeve;

[0027] A central rod slidably connected along the sliding sleeve ring, and the central rod is fixedly connected to the sealing head; and

[0028] A first compression spring sleeved on the circumferences of the sliding sleeve and the central rod, and both ends of the first compression spring are respectively connected to the water-permeable plate and the sealing head.

[0029] Further, it further includes:

[0030] An annular groove is provided on the outer side wall of the check valve;

[0031] A plurality of balls are movably connected to the drill pipe string reducer joint along its radial direction; and

[0032] A plurality of locking rings are sleeved on the circumference of the drill pipe string reducer joint, and the locking rings selectively drive the balls to be detachably connected to the annular groove.

[0033] Further, an annular protrusion is provided on the inner wall of the locking ring, and when the annular protrusion faces the ball, it can drive the ball to move closer to the axis direction of the drill pipe string reducer joint;

[0034] A limiting ring is fixedly connected to the outer side wall of the drill pipe string reducer joint, and a second compression spring is sleeved, and the limiting ring and the second compression spring are respectively located on both sides of the annular protrusion, and both ends of the second compression spring are respectively connected to the drill pipe string reducer joint and the annular protrusion.

[0035] The present utility model has at least the following advantages compared with the prior art:

[0036] During use, place the drill pipe string reducer joint and the check component inside the casing, and compress them using the expansion ball assembly so that they expand in the radial direction of the drill pipe string reducer joint, and then make them abut between the drill pipe string reducer joint and the casing, which can prevent cement from flowing out between the drill pipe string reducer joint and the casing, and effectively control the height of the cement return during the cementing operation. Brief Description of the Drawings

[0037] In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings required for use in the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0038] Figure 1 It is a schematic diagram of the overall structure of the pressure-sealed hole water stopper for geological drilling holes of the present invention;

[0039] Figure 2 It is a schematic diagram of the structure of the drill pipe string reducer joint of the present invention;

[0040] Figure 3 It is a schematic diagram of the structure of the check component of the present invention;

[0041] Figure 4 It is a cross-sectional view of the pressure-sealed hole water stopper for geological drilling holes of the present invention.

[0042] Reference numerals: 1, drill pipe string reducer joint; 2, drill pipe string; 3, expansion ball; 4, fixing ring; 5, first reinforcement ring; 6, stop ring; 7, driving ring; 8, operating rod; 9, operating ring; 10, second reinforcement ring; 11, check pipe; 12, sealing port; 13, sealing head; 14, permeable plate; 15, sliding sleeve; 16, center rod; 17, first compression spring; 18, annular groove; 19, ball; 20, locking ring; 21, annular protrusion; 22, limiting ring; 23, second compression spring. Detailed Description of the Embodiments

[0043] The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the drawings in the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, rather than all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts belong to the scope of protection of the present invention.

[0044] To make the above objects, features, and advantages of the present invention more clearly understood, the present invention will be further described in detail below with reference to the drawings and specific embodiments.

[0045] Referring to Figures 1-4 , the utility model provides a pressure - sealed hole water - stop device for geological drilling holes, which includes a drill pipe string reducer joint 1, an expansion ball assembly and a check component. Among them, one end of the drill pipe string reducer joint 1 is used to connect the drill pipe string 2. An expansion ball assembly is sleeved on the outer side wall of the drill pipe string reducer joint 1. The expansion ball assembly can freely expand and contract along the axis direction of the drill pipe string reducer joint 1, and simultaneously realize contraction and expansion along the radial direction of the drill pipe string reducer joint 1, and is used for selectively sealing with the peripheral casing (not shown in the figure); the check component is also arranged in the casing and is detachably connected to the other end of the drill pipe string reducer joint 1, and the check component is used to realize the one - way flow of cement along the drill pipe string reducer joint 1 towards the check component.

[0046] During use, the drill pipe string reducer joint 1 and the check component are placed in the casing, and the expansion ball assembly is compressed to make it expand along the radial direction of the drill pipe string reducer joint 1, and then it abuts between the drill pipe string reducer joint 1 and the casing, which can avoid the outflow of cement from between the drill pipe string reducer joint 1 and the casing, and effectively control the height of the cement return height during the cementing operation.

[0047] Preferably, the expansion ball assembly includes an expansion ball 3, a fixing ring 4 and a driving ring 7. Among them, the expansion ball 3 is made of rubber material and can deform. The expansion ball 3 is sleeved on the outer side wall of the drill pipe string reducer joint 1; the fixing ring 4 is fixedly connected to one end of the expansion ball 3 close to the check component, and the fixing ring 4 is fixedly welded on the outer side wall of the drill pipe string reducer joint 1; the driving ring 7 is located on the side of the expansion ball 3 away from the check component and abuts against one end of the expansion ball 3 away from the check component. The driving ring 7 is movably connected to the outer side wall of the drill pipe string reducer joint 1. When the driving ring 7 and the fixing ring 4 approach or move away from each other, the expansion and contraction of the expansion ball 3 along the radial direction of the drill pipe string reducer joint 1 can be respectively realized.

[0048] In addition, the expansion ball assembly further includes a stop ring 6 and a first reinforcement ring 5. The stop ring 6 is fixedly connected to one end of the expansion ball 3 away from the check component, and the stop ring 6 is slidably connected to the outer side wall of the drill pipe string reducer joint 1. The stop ring 6 is located between the fixing ring 4 and the driving ring 7 and abuts against the driving ring 7. When the driving ring 7 moves along the outer side wall of the drill pipe string reducer joint 1, it can push the stop ring 6 to slide along the radial direction of the drill pipe string reducer joint 1, thereby driving the expansion and contraction of the expansion ball 3; a plurality of first reinforcement rings 5 are provided and are arranged at equal intervals along the drill pipe string reducer joint 1. The first reinforcement rings 5 are fixedly connected to the outer side wall of the expansion ball 3. The plurality of first reinforcement rings 5 are located between the fixing ring 4 and the stop ring 6 and are arranged opposite to the stop ring 6.

[0049] In the present utility model, an external thread is provided on the outer sidewall of the drill pipe string reducer joint 1, and an internal thread adapted to the external thread is provided on the inner sidewall of the driving ring 7. The driving ring 7 is threadedly connected to the outer sidewall of the drill pipe string reducer joint 1. During the rotation of the driving ring 7 on the outer sidewall of the drill pipe string reducer joint 1, it can move in the radial direction of the drill pipe string reducer joint 1, thereby driving the expansion ball 3 to expand and contract.

[0050] To drive the movement of the driving ring 7, the present utility model further provides a locking card, which includes an operating ring 9 movably sleeved on the periphery of the drill pipe string 2, and a plurality of operating rods 8 arranged at circumferential intervals along the axial direction of the drill pipe string 2. One end of the operating rod 8 is fixedly connected to the operating ring 9, and a plurality of blind holes corresponding to the operating rods 8 one by one are provided on the end face of the driving ring 7 away from the stop ring 6. The other end of the operating rod 8 is detachably connected to the blind hole.

[0051] To improve the structural strength of the operating rod 8, a plurality of second reinforcement rings 10 are arranged at intervals along the length direction of the operating rod 8. The second reinforcement rings 10 are used to be sleeved on the periphery of the drill pipe string 2, and the second reinforcement rings 10 are fixedly connected to the plurality of operating rods 8. To facilitate the screwing of the operating ring 9, the operating ring 9 has an external hexagonal structure and can be controlled to rotate by using a wrench or the like.

[0052] During use, the other end of the operating rod 8 is inserted into the blind hole, and the operating ring 9 is screwed by using a wrench, thereby driving the driving ring 7 to rotate synchronously, and further driving the expansion ball 3 to achieve the expansion and contraction effect.

[0053] The check component of the present utility model includes a check pipe 11, a plugging head 13 and an elastic component. The check pipe 11 is detachably connected to the other end of the drill pipe string reducer joint 1. A tapered plugging port 12 is provided on the inner sidewall of the check pipe 11, and the tip of the plugging port 12 faces the drill pipe string reducer joint 1; the plugging head 13 is tapered, the plugging head 13 faces the plugging port 12, and the plugging head 13 is slidably connected along the radial direction of the check pipe 11, and the plugging head 13 selectively closes or opens the plugging port 12; the elastic component is used to drive the plugging head 13 to move towards the plugging port 12.

[0054] Preferably, the elastic component includes a water-permeable plate 14, a central rod 16, and a first compression spring 17. An annular notch is provided on the inner sidewall of the check valve pipe 11. The water-permeable plate 14 is clamped at the annular notch, and the water-permeable plate 14 is fixedly connected to the check valve pipe 11. The water-permeable plate 14 is located on the side of the plugging port 12 away from the drill pipe string reducer joint 1. The water-permeable plate 14 is provided with a central through hole and a plurality of water-permeable holes. The inner sidewall of the central through hole extends along the side close to the plugging port 12 to form a sliding sleeve 15. The plurality of water-permeable holes are arranged at circumferential intervals along the axis of the sliding sleeve 15. The central rod 16 is slidably connected along the sliding sleeve 15, and the central rod 16 is fixedly connected to the plugging head 13. The first compression spring 17 is sleeved on the peripheries of the sliding sleeve 15 and the central rod 16, and the two ends of the first compression spring 17 are respectively connected to the water-permeable plate 14 and the plugging head 13.

[0055] During use, the cement slurry enters the check valve pipe 11 through the drill pipe string reducer joint 1, causing the first compression spring 17 to compress. Subsequently, it passes through the water-permeable holes and through the check valve pipe 11. When the cement moves from the check valve pipe 11 towards the direction of the cement slurry entering through the drill pipe string reducer joint 1, the first compression spring 17 drives the plugging head 13 to close the plugging port 12, making it difficult for the cement to pass through the check valve pipe 11 and avoiding the backflow of the cement.

[0056] In addition, a quick-release structure is provided between the drill pipe string reducer joint 1 and the check valve pipe 11 of the present invention. Specifically, it further includes the following structures: an annular groove 18 is provided on the outer sidewall of the check valve pipe 11; a plurality of balls 19 are movably connected along the radial direction of the drill pipe string reducer joint 1; and a plurality of locking rings 20 are sleeved on the periphery of the drill pipe string reducer joint 1, and the locking rings 20 selectively drive the balls 19 to be detachably connected to the annular groove.

[0057] An annular protrusion 21 is provided on the inner wall of the locking ring 20. When the annular protrusion 21 faces the ball 19, it can drive the ball 19 to move in the direction close to the axis of the drill pipe string reducer joint 1. A limiting ring 22 is fixedly connected to the outer sidewall of the drill pipe string reducer joint 1, and a second compression spring 23 is sleeved. The limiting ring 22 and the second compression spring 23 are respectively located on both sides of the annular protrusion 21. The limiting ring 22 is used to selectively abut against the annular protrusion. The two ends of the second compression spring 23 are respectively connected to the drill pipe string reducer joint 1 and the annular protrusion 21. The second compression spring 23 is used to drive the annular protrusion 21 to face the ball 19. Furthermore, the annular protrusion 21 drives the ball 19 to protrude from the inner sidewall of the drill pipe string reducer joint 1 to achieve selective detachable connection with the annular groove 18.

[0058] In use, the locking ring 20 is slid to overcome the elastic force of the second compression spring 23, so that the annular protrusion 21 is misaligned with the ball 19. At this time, the ball 19 can move freely along the radial direction of the drill pipe string reducer joint 1. At this time, the check valve pipe 11 and the drill pipe string reducer joint 1 are docked. Subsequently, the control of the limit ring 22 is released. The locking ring 20 slides reversely under the action of the second compression spring 23 and abuts against the limit ring 22. Synchronously, the annular protrusion 21 and the ball 19 are arranged oppositely, driving the ball 19 to protrude from the inner wall of the drill pipe string reducer joint 1 and simultaneously being arranged in the annular groove 18, realizing the connection process of the check valve pipe 11 and the drill pipe.

[0059] In the description of the present invention, it should be understood that the orientation or positional relationship indicated by the terms "longitudinal", "transverse", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present invention, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation to the present invention.

[0060] The above-described embodiments are only descriptions of the preferred embodiments of the present invention, and do not limit the scope of the present invention. Without departing from the design spirit of the present invention, various deformations and improvements made by those of ordinary skill in the art to the technical solutions of the present invention shall fall within the protection scope determined by the claims of the present invention.

Claims

1. A pressure-sealed hole water stopper for geological drilling holes, characterized in that, Comprising: A drill pipe string reducer joint (1), one end of which is used to connect the drill pipe string (2). An expansion ball assembly is sleeved on the outer sidewall of the drill pipe string reducer joint (1). The expansion ball assembly can freely expand and contract along the axial direction of the drill pipe string reducer joint (1), and realize contraction and expansion along the radial direction of the drill pipe string reducer joint (1), for selectively achieving sealing with the surrounding casing; and A check component detachably connected to the other end of the drill pipe string reducer joint (1), the check component being used to realize the one-way flow of cement along the drill pipe string reducer joint (1) towards the check component.

2. The pressure-sealed hole water stopper for geological drilling holes according to claim 1, characterized in that, The expansion ball assembly includes: An expansion ball (3) sleeved on the outer sidewall of the drill pipe string reducer joint (1); A fixing ring (4) fixedly connected to one end of the expansion ball (3) close to the check component, the fixing ring (4) being fixedly connected to the outer sidewall of the drill pipe string reducer joint (1); and A driving ring (7) abutted against the other end of the expansion ball (3) away from the check component. The driving ring (7) is movably connected to the outer sidewall of the drill pipe string reducer joint (1). The driving ring (7) and the fixing ring (4) approach and move away from each other, and can respectively realize the expansion and contraction of the expansion ball (3) along the radial direction of the drill pipe string reducer joint (1).

3. The pressure-sealing hole water-stop device for geological drilling holes according to claim 2, characterized in that, The expansion ball assembly further includes: A stop ring (6) fixedly connected to the other end of the expansion ball (3) away from the check component. The stop ring (6) is slidably connected to the outer sidewall of the drill pipe string reducer joint (1). The stop ring (6) is located between the fixing ring (4) and the driving ring (7), and the stop ring (6) abuts against the driving ring (7); and A plurality of first reinforcement rings (5) are further fixedly connected to the outer sidewall of the expansion ball (3). The plurality of first reinforcement rings (5) are located between the fixing ring (4) and the stop ring (6) and are arranged at equal intervals.

4. The pressure-sealing hole water stopper for geological drilling holes according to claim 3, characterized in that, External threads are provided on the outer sidewall of the drill pipe string reducer joint (1), and internal threads adapted to the external threads are provided on the inner sidewall of the driving ring (7). The driving ring (7) is threadedly connected to the outer sidewall of the drill pipe string reducer joint (1).

5. The pressure-sealed hole water stopper for geological drilling holes according to claim 4, characterized in that, It further includes a lock card. The lock card includes an operation ring (9) movably sleeved on the periphery of the drill pipe string (2), and a plurality of operation rods (8) arranged at circumferential intervals along the axial direction of the drill pipe string (2). One end of the operation rod (8) is fixedly connected to the operation ring (9). A plurality of blind holes corresponding to the operation rods (8) one by one are provided on the end face of the driving ring (7) away from the stop ring (6). The other end of the operation rod (8) is detachably connected to the blind hole.

6. The pressure-sealed hole water stopper for geological drilling holes according to claim 5, characterized in that, A plurality of second reinforcement rings (10) are arranged at intervals along the length direction of the operation rod (8). The second reinforcement rings (10) are sleeved on the periphery of the drill pipe string (2), and the second reinforcement rings (10) are fixedly connected to the plurality of operation rods (8).

7. The pressure-sealing hole water stopper for geological drilling holes according to claim 1, characterized in that, The check component includes: A check valve (11) detachably connected to the other end of the drill pipe string reducer joint (1), wherein the inner side wall of the check valve (11) is provided with a tapered plugging opening (12), and the tapered tip of the plugging opening (12) faces the drill pipe string reducer joint (1); A tapered plug (13) slidably connected in the radial direction of the check valve (11), and the plug (13) selectively closes or opens the plugging opening (12); and An elastic component for driving the plug (13) to move towards the plugging opening (12).

8. The pressure-sealed hole water stopper for geological drilling holes according to claim 7, characterized in that, The elastic component includes: A water-permeable plate (14) fixedly connected inside the check valve (11), the water-permeable plate (14) is located on the side of the plugging opening (12) away from the drill pipe string reducer joint (1), the water-permeable plate (14) is provided with a central through hole and a plurality of water-permeable holes, the inner side wall of the central through hole extends to form a sliding sleeve (15) along the side close to the plugging opening (12), and the plurality of water-permeable holes are arranged at circumferential intervals along the axis of the sliding sleeve (15); A central rod (16) slidably connected along the sliding sleeve (15) in a ring shape, and the central rod (16) is fixedly connected to the plug (13); and A first compression spring (17) sleeved on the circumferences of the sliding sleeve (15) and the central rod (16), and the two ends of the first compression spring (17) are respectively connected to the water-permeable plate (14) and the plug (13).

9. The pressure-sealing hole water stopper for geological drilling holes according to claim 7, characterized in that, It further includes: An annular groove (18) is provided on the outer side wall of the check valve (11); A plurality of balls (19) are movably connected to the drill pipe string reducer joint (1) along its radial direction; and A plurality of locking rings (20) are sleeved on the circumference of the drill pipe string reducer joint (1), and the locking rings (20) selectively drive the balls (19) to be detachably connected to the annular groove (18).

10. The pressure-sealing hole water stopper for geological drilling holes according to claim 9, characterized in that, An annular protrusion (21) is provided on the inner wall of the locking ring (20), and when the annular protrusion (21) faces the ball (19), it can drive the ball (19) to move in the direction close to the axis of the drill pipe string reducer joint (1); A limit ring (22) is fixedly connected to the outer side wall of the drill pipe string reducer joint (1), and a second compression spring (23) is sleeved thereon. The limit ring (22) and the second compression spring (23) are respectively located on both sides of the annular protrusion (21), and the two ends of the second compression spring (23) are respectively connected to the drill pipe string reducer joint (1) and the annular protrusion (21).

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