Blowout preventer for underground water exploration and drainage drilling

Abstract

The utility model discloses an underground water exploration and drainage drilling blowout preventer, and relates to the technical field of drilling blowout prevention. The device comprises a mounting piece, a rectangular frame and a rubber ring, the rectangular frame is arranged on the upper end face of the mounting piece, and a clamping assembly corresponding to the rubber ring is arranged in the rectangular frame; the clamping assembly comprises a worm gear and a rotating part, a circular plate is arranged on one end face of the worm gear, two arc-shaped grooves are formed in the end face, away from the worm gear, of the circular plate, an adjusting groove is formed in the rectangular frame, and a first sliding part and a second sliding part are in sliding fit. Through cooperation of a worm gear and a worm, a rotating piece can be conveniently rotated to drive a circular plate to rotate, meanwhile, the rotating piece is matched with a first guide rod, a second guide rod and an arc-shaped groove, symmetrical movement of a first sliding piece and a second sliding piece is controlled, and the uniformity of pressing the side portion of a rubber ring by two arc-shaped blocks is improved; and the probability of sealing failure caused by non-uniform pressure on the single side of the rubber ring is reduced.

Description

TECHNICAL FIELD

[0001] The utility model belongs to the field of drilling blowout preventer, concretely relates to a downhole water exploration and drainage drilling blowout preventer. BACKGROUND

[0002] The downhole water exploration and drainage drilling blowout preventer is the key safety equipment for plugging the drilling hole and preventing the sudden blowout of high-pressure water or gas in the coal mine.

[0003] The patent with the publication number CN217872721U discloses a coal mine downhole water exploration and drainage drilling hole blowout preventer, which comprises a rectangular frame and a rubber ring arranged in the rectangular frame.

[0004] However, the coal mine downhole water exploration and drainage drilling hole blowout preventer disclosed in the application can not uniformly press the rubber ring through the rotation of the handles of the two threaded rods, which can easily cause uneven pressure on one side of the rubber ring and affect the sealing effect of the rubber ring. UTILITY MODEL CONTENTS

[0005] The utility model overcomes the defects of the prior art and provides a downhole water exploration and drainage drilling blowout preventer to solve the problems in the background.

[0006] To solve the above technical problems, the basic idea of the technical scheme of the utility model is as follows:

[0007] A downhole water exploration and drainage drilling blowout preventer comprises a mounting piece, a rectangular frame, and a rubber ring, the rectangular frame is arranged on the upper end surface of the mounting piece, the rubber ring is located on the upper end surface of the mounting piece, the rectangular frame is located on the circumferential side of the rubber ring, and a clamping assembly corresponding to the rubber ring is arranged in the rectangular frame.

[0008] The clamping assembly comprises a worm wheel and a rotating piece, one end surface of the worm wheel is provided with a circular plate, two arc-shaped grooves are arranged on the end surface of the circular plate away from the worm wheel, the two arc-shaped grooves are rotationally symmetrical about the axis of the circular plate, an adjusting groove is arranged in the rectangular frame, a first sliding piece and a second sliding piece are slidingly matched with the adjusting groove, the worm wheel and the circular plate are rotationally matched in the adjusting groove, a worm is arranged on the circumferential side of the rotating piece and engaged with the worm wheel, the worm is rotationally matched in the adjusting groove, a first guide rod is arranged on one side of the first sliding piece, a second guide rod is arranged on one side of the second sliding piece, the first guide rod and the second guide rod are respectively located in the corresponding arc-shaped grooves, arc-shaped blocks are arranged on one end of the first sliding piece and the second sliding piece, the rubber ring is located between the two arc-shaped blocks, and the arc-shaped blocks are located on the upper end surface of the mounting piece.

[0009] Optionally, the rotating member comprises a connecting rod, the worm is arranged on the circumferential side of the connecting rod, the connecting rod transversely penetrates the rectangular frame and the adjusting slot, one end surface of the connecting rod is provided with a knob, the knob is located on one side of the rectangular frame, bearings are inlaid on both sides of the adjusting slot, the bearings are arranged on the circumferential side of the connecting rod, and the worm is located between the two bearings.

[0010] Optionally, one end surface of the worm wheel is provided with a rotating rod, the worm wheel is located between the circular plate and the rotating rod, one side of the adjusting slot is provided with a rotating slot, the rotating rod is rotationally matched in the rotating slot, the rotating rod is provided with a rotating ring on the circumferential side, the rotating slot is provided with a ring slot on the circumferential side, and the rotating ring is rotationally matched in the ring slot.

[0011] Optionally, the mounting member comprises a base, the rectangular frame is arranged on the upper end surface of the base, the rubber ring is located on the upper end surface of the base, the base is vertically provided with a slot hole and a plurality of through holes, the rubber ring corresponds to the slot hole, and the slot hole and the through holes all penetrate the base.

[0012] Optionally, the first sliding member comprises a first sliding plate, the first guide rod is arranged on one side of the first sliding plate, the first sliding plate is provided with a second sliding plate on one side, the first sliding plate is located between the first guide rod and the second sliding plate, the first sliding plate and the second sliding plate are all slidingly matched in the rectangular frame, and the second sliding plate is provided with a first connecting block between the corresponding arc-shaped block.

[0013] Optionally, the second sliding member comprises a third sliding plate, the second guide rod is arranged on one side of the third sliding plate, the third sliding plate is provided with a fourth sliding plate on one side, the third sliding plate is located between the second guide rod and the fourth sliding plate, the third sliding plate and the fourth sliding plate are all slidingly matched in the rectangular frame, the fourth sliding plate is provided with a second connecting block between the corresponding arc-shaped block, and one end of the second sliding plate is located on one side of the second connecting block away from the arc-shaped block.

[0014] Optionally, one side of the inner wall of the rectangular frame is provided with a first sliding groove, the second sliding plate and the fourth sliding plate are all slidingly matched in the first sliding groove, one side of the first sliding groove is provided with a second sliding groove, the second sliding groove is communicated with the adjusting slot, the first sliding plate and the third sliding plate are all slidingly matched in the second sliding groove, and the heights of the first sliding plate and the third sliding plate are all greater than the height of the first sliding groove.

[0015] After the above technical scheme is adopted, the present application has the following advantages compared with the prior art, of course, any product implementing the present application does not necessarily need to achieve all the advantages described below:

[0016] Through cooperation of the worm wheel and the worm, the circular plate is conveniently driven to rotate by rotating the rotating member, meanwhile, cooperation with the first guide rod, the second guide rod and the arc-shaped slot controls symmetrical movement of the first sliding member and the second sliding member, improves uniformity of the two arc-shaped blocks in pressing the side of the rubber ring, and reduces probability of sealing failure caused by uneven pressure on one side of the rubber ring.

[0017] The specific embodiments of the present application will be further described in details below with reference to the drawings. BRIEF DESCRIPTION OF DRAWINGS

[0018] The drawings in the following description are only some embodiments, and other drawings can be obtained by those skilled in the art without creative labor on the basis of these drawings. In the drawings

[0019] In the drawings:

[0020] Figure 1 It is a three-dimensional structure schematic diagram of the blowout preventer;

[0021] Figure 2 It is a sectional structure schematic diagram of the blowout preventer;

[0022] Figure 3 It is a sectional structure schematic diagram of the clamping assembly;

[0023] Figure 4 It is a three-dimensional structure schematic diagram of the arc-shaped block;

[0024] Figure 5 It is a three-dimensional structure schematic diagram of the round plate.

[0025] In the drawings, the component list represented by each number is as follows:

[0026] Base 1, rectangular frame 2, rubber ring 3, arc-shaped block 4, second connecting block 5, second sliding plate 6, first sliding plate 7, round plate 8, arc-shaped groove 9, worm gear 10, worm 11, connecting rod 12, knob 13, first connecting block 14, first guide rod 16, second guide rod 17, fourth sliding plate 22, third sliding plate 23.

[0027] It should be noted that these drawings and written descriptions are not intended to limit the scope of the concept of the present application in any way, but to illustrate the concept of the present application to those skilled in the art by referring to specific embodiments. DETAILED DESCRIPTION

[0028] The technical solutions in the embodiments of the present application will be described in a clear and complete manner below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only some of the embodiments of the present application, not all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor are within the scope of protection of the present application.

[0029] In order to make the above-mentioned purposes, features and advantages of the present application more obvious and easy to understand, the present application will be further described in details below with reference to the drawings and specific embodiments.

[0030] In coal mine underground operation, water detection and drainage drilling is an important technical means for water disaster prevention and control, and its core goal is to release high-pressure water in potential aquifer through drilling, thereby reducing the risk of water inrush accidents. In this process, the orifice blowout preventer is a key safety device used to prevent high-pressure water from carrying coal and rock debris out of the drilling hole, ensuring the safety of operating personnel and maintaining the stability of the underground environment. In the prior art, such devices form various types of design schemes according to different driving methods, sealing structures and operating principles, mainly serving the sealing needs in different working conditions.

[0031] Traditional mechanical clamping type blowout preventers are widely used, and their basic structure usually includes a fixed frame, clamping arms and sealing elements. The fixed frame is connected to the drilling hole by bolts or welding, the clamping arms are symmetrically distributed on both sides of the drill pipe, and the clamping arms are driven to move towards the center by rotating the threaded rods or lever mechanisms by hand, thereby squeezing the rubber ring or other elastic sealing material to tightly grip the drill pipe. The advantage of such devices is that they have simple structure, low cost, and do not need to rely on external power source, which is suitable for the underground environment where power supply is limited. However, during the operation process, the pressure of the clamping arms on both sides needs to be adjusted manually, which may result in uneven force. For example, when the operator rotates the threaded rods on both sides, due to the difference in force angle and rotation number, the clamping arm on one side may be squeezed too early, while the other side may not reach the predetermined pressure, causing local overwear of the sealing element or poor fit of the sealing surface, affecting the overall blowout prevention effect. In addition, the threaded rods are easily rusted by the humid environment in the mine during frequent adjustment, further increasing the operation resistance and reducing the adjustment accuracy.

[0032] Another common design uses hydraulic drive technology to push the clamping block through the hydraulic cylinder to achieve sealing. Such devices usually include a hydraulic pump station, oil line, hydraulic cylinder and control system. During operation, hydraulic oil is delivered to the hydraulic cylinder through the pipeline to drive the piston rod to extend or retract, driving the clamping block to apply uniform pressure to the rubber ring. Compared with pure mechanical structure, the hydraulic system has the advantage of precise control at high pressure, and the symmetry of the clamping force can be ensured by the hydraulic circuit design. However, its limitations are also obvious: the space is narrow in the underground environment, and the installation of hydraulic pump station and the laying of oil line require additional space, increasing the difficulty of equipment deployment; the hydraulic system has high requirements for oil cleanliness, and dust and moisture in the coal mine can easily contaminate the oil, causing valve blockage or seal failure; in addition, the maintenance cost of the hydraulic system is high, and the filter element needs to be replaced regularly and the hydraulic oil needs to be supplemented, which is difficult to implement in the harsh underground environment.

[0033] As an alternative to hydraulic technology, the pneumatic driving scheme utilizes compressed air as the power source to drive the clamping mechanism through the air cylinder. Its structure is similar to the hydraulic system, but replaces the oil circuit with the air circuit, with the characteristics of clean and environmentally friendly, easy maintenance. Pneumatic blowout preventer performs well in fast response and is suitable for conditions that need to be frequently opened and closed. However, the compressibility of air leads to insufficient stability of its output force, especially under high-pressure water impact conditions, the cylinder may have a clamping force drop due to pressure fluctuations, and then cause sealing failure. In addition, the pneumatic system needs a stable supply of compressed air, and the pressure fluctuations in the downhole compressed air pipe network may directly affect the performance of the device, limiting its reliability in complex conditions.

[0034] In recent years, some improved designs attempt to combine mechanical and automatic control technologies, such as introducing spring energy storage elements or electromagnetic braking devices into the clamping mechanism. Such devices usually preset a clamping force threshold, and after the drill pipe is inserted, the spring automatically releases the pre-stored energy to push the clamping block to close, or the electromagnetic iron is powered to generate a magnetic force to lock the clamping position. The advantage of this type of design is to reduce manual intervention and improve operational efficiency. However, in practical applications, the problem of spring fatigue and aging is difficult to avoid, and the decrease in the spring constant over time will lead to a decrease in clamping force; the electromagnetic device has a higher requirement for power stability, and electromagnetic interference in the well may affect the accuracy of the control signal. In addition, the complexity of the structure of such devices increases significantly, and the difficulty of troubleshooting and component replacement also increases.

[0035] From the development of sealing elements, early devices mostly use a single rubber ring as a sealing medium, relying on the elastic deformation of the material to fill the gap between the drill pipe and the port. With the progress of material technology, composite sealing structures have been gradually applied, such as embedding a metal skeleton in the rubber ring to increase the compressive strength, or coating polytetrafluoroethylene on the surface of the rubber layer to reduce the friction coefficient. However, such improvements do not fundamentally solve the problem of uneven pressure on the sealing element, especially when there is a slight deflection or ovality error in the drill pipe, single-point stress concentration may still accelerate local wear of the sealing ring. Some schemes attempt to use a multi-segment sealing ring design to achieve adaptive sealing by independently adjusting the pressure of each segment, but the adjustment mechanism is complicated, and the operation steps increase, which is not conducive to fast operation in the well.

[0036] In view of the diversity of drill pipe specifications, existing technologies usually achieve compatibility by replacing sealing rings of different inner diameters or adding variable diameter adapters. Although this method expands the application range of the device, replacing parts on site requires downtime, affecting the continuity of the operation. A few designs attempt to use adjustable inner diameter sealing structures, such as laminated sealing rings or inflatable expansion capsules, but the laminated structure is prone to lateral slip under high pressure, and the inflatable capsule has a risk of bursting, with limited practical application effect.

[0037] From the perspective of environmental adaptability, downhole water detection and drainage operations often face high humidity, high dust and corrosive water environments, which puts strict requirements on the corrosion resistance of blowout preventers. In existing devices, metal components are often treated with zinc plating or sprayed with corrosion-resistant coatings, and non-metallic seals are mainly made of nitrile rubber and fluorine rubber. However, long-term contact with sulfur-containing groundwater or acidic media can still cause the coating to peel off and the rubber to harden, shortening the service life of the device. In addition, the vibration generated during the movement of the drill pipe can cause the connecting bolts to loosen, leading to a decline in the overall sealing performance of the device. Existing technologies rely on regular manual inspections for tightening and lack effective automatic monitoring and warning mechanisms.

[0038] In summary, existing downhole water detection and drainage drilling blowout preventers have formed various solutions in terms of structural design, power drive, sealing elements, installation methods, and environmental adaptability, but still have technical bottlenecks such as insufficient uniformity of pressure application, limited adjustment precision, high maintenance costs, and weak environmental adaptability. Especially in high water pressure and large flow conditions, how to achieve rapid, stable and uniform sealing force application while considering the convenience of operation and the reliability of equipment is still a technical difficulty that needs to be broken through in this field. These existing problems provide a clear direction for subsequent technical improvements, prompting researchers to seek innovative breakthroughs from the dimensions of transmission mechanism optimization, new material application, and intelligent control.

[0039] Please refer to Figures 1-5 In the embodiment shown, a downhole water detection and drainage drilling blowout preventer is provided, which includes a mounting member, a rectangular frame 2, and a rubber ring 3. The rectangular frame 2 is installed on the upper end surface of the mounting member, and the rubber ring 3 is located on the upper end surface of the mounting member. The rectangular frame 2 is located on the circumferential side of the rubber ring 3. A clamping assembly corresponding to the rubber ring 3 is provided in the rectangular frame 2.

[0040] The clamping assembly includes a worm gear 10 and a rotating member. One end surface of the worm gear 10 is provided with a circular plate 8. Two arc-shaped grooves 9 are provided on the end surface of the circular plate 8 away from the worm gear 10. The two arc-shaped grooves 9 are rotationally symmetrical about the axis of the circular plate 8. An adjusting groove is provided in the rectangular frame 2, and a first sliding member and a second sliding member are slidingly fitted in the adjusting groove. The worm gear 10 and the circular plate 8 are both rotationally fitted in the adjusting groove. A worm gear 11 engaged with the worm gear 10 is installed on the circumferential side of the rotating member. The worm gear 11 is rotationally fitted in the adjusting groove. A first guide rod 16 is installed on one side of the first sliding member, and a second guide rod 17 is installed on one side of the second sliding member. The first guide rod 16 and the second guide rod 17 are respectively located in the corresponding arc-shaped grooves 9. An arc-shaped block 4 is installed on one end of the first sliding member and the second sliding member. The rubber ring 3 is located between the two arc-shaped blocks 4, and the arc-shaped blocks 4 are located on the upper end surface of the mounting member.

[0041] The application of one aspect of the embodiment is: in use, first rotate the rotating part on one side of the rectangular frame 2, the rotating part drives the worm gear 10 engaged with it to rotate through the rotation of the worm 11, the worm gear 10 drives the circular plate 8 to rotate synchronously, the circular plate 8 drives the two arc-shaped grooves 9 to rotate through the rotation of the two arc-shaped blocks 4, and the first guide rod 16 and the second guide rod 17 are forced to slide along the adjusting groove by the groove wall of the arc-shaped groove 9, so that the first guide rod 16 and the second guide rod 17 are close to each other, so that the first sliding part and the second sliding part are close to each other, and the first sliding part and the second sliding part move to extrude the arc-shaped block 4 at the end thereof towards the rubber ring 3, so that the rubber ring 3 is uniformly pressed by the two arc-shaped blocks 4 to tightly hold the drill rod, and the water jet of the hole is blocked. In the same way, the above operation can quickly cancel the extrusion of the rubber ring 3. It should be noted that all the electrical equipment involved in the present application can be powered by a battery or an external power source.

[0042] Through the cooperation of the worm gear 10 and the worm 11, the rotating part is convenient to drive the circular plate 8 to rotate, and the first guide rod 16, the second guide rod 17 and the arc-shaped groove 9 are cooperated to control the symmetrical movement of the first sliding part and the second sliding part, so as to improve the uniformity of the two arc-shaped blocks 4 pressing the rubber ring 3, and reduce the probability of sealing failure caused by uneven pressure on one side of the rubber ring 3.

[0043] As shown in Figures 1-3 The rotating part of the embodiment includes a connecting rod 12, the worm 11 is arranged on the circumferential side of the connecting rod 12, the connecting rod 12 transversely penetrates the rectangular frame 2 and the adjusting groove, a knob 13 is arranged on one end surface of the connecting rod 12, the knob 13 is located on one side of the rectangular frame 2, and the worm 11 in the adjusting groove is rotated by rotating the knob 13.

[0044] As shown in Figure 3 Both sides of the adjusting groove of the embodiment are embedded with bearings, the bearings are arranged on the circumferential side of the connecting rod 12, and the worm 11 is located between the two bearings. The bearings reduce the friction between the connecting rod 12 and the rectangular frame 2 when the connecting rod 12 rotates, and improve the smoothness of the rotation of the knob 13.

[0045] As shown in Figure 3 One end surface of the worm gear 10 of the embodiment is provided with a rotating rod, the worm gear 10 is located between the circular plate 8 and the rotating rod, one side of the adjusting groove is provided with a rotating groove, the rotating rod is rotationally fitted in the rotating groove, the rotating rod is provided with a rotating ring on the circumferential side, the rotating groove is provided with a ring groove on the circumferential side, and the rotating ring is rotationally fitted in the ring groove. Through the cooperation of the rotating ring and the ring groove, the stability of the rotation of the worm gear 10 in the adjusting groove is improved, and the probability of the worm gear 10 deviating and disengaging from the worm 11 is reduced.

[0046] As shown in Figures 1-3As shown in the drawings, the mounting part of the embodiment comprises a base 1, a rectangular frame 2 is arranged on the upper end surface of the base 1, a rubber ring 3 is arranged on the upper end surface of the base 1, the base 1 is vertically provided with a slot hole and a plurality of through holes, the rubber ring 3 corresponds to the slot hole, and the slot hole and the through holes all penetrate through the base 1; the through holes facilitate the use of bolts to fix the device at a specified position, thereby improving the firmness of the mounting part.

[0047] As shown in the drawings, Figure 4 The first sliding part of the embodiment comprises a first sliding plate 7, a first guide rod 16 is arranged on one side of the first sliding plate 7, a second sliding plate 6 is arranged on one side of the first sliding plate 7, the first sliding plate 7 is located between the first guide rod 16 and the second sliding plate 6, and the first sliding plate 7 and the second sliding plate 6 are both slidingly fitted in the rectangular frame 2; a first connecting block 14 is arranged between the second sliding plate 6 and the corresponding arc-shaped block 4, and through the cooperation of the first sliding plate 7, the second sliding plate 6 and the first connecting block 14, the corresponding arc-shaped block 4 can be driven to move synchronously when the first guide rod 16 moves.

[0048] As shown in the drawings, Figure 4 The second sliding part of the embodiment comprises a third sliding plate 23, a second guide rod 17 is arranged on one side of the third sliding plate 23, a fourth sliding plate 22 is arranged on one side of the third sliding plate 23, the third sliding plate 23 is located between the second guide rod 17 and the fourth sliding plate 22, and the third sliding plate 23 and the fourth sliding plate 22 are both slidingly fitted in the rectangular frame 2; a second connecting block 5 is arranged between the fourth sliding plate 22 and the corresponding arc-shaped block 4, and one end of the second sliding plate 6 is located on one side of the second connecting block 5 away from the arc-shaped block 4; through the cooperation of the third sliding plate 23, the fourth sliding plate 22 and the second connecting block 5, the corresponding arc-shaped block 4 can be driven to move synchronously when the second guide rod 17 moves.

[0049] As shown in the drawings, Figure 2 The inner wall of the rectangular frame 2 is provided with a first sliding groove on one side, the second sliding plate 6 and the fourth sliding plate 22 are both slidingly fitted in the first sliding groove, the first sliding groove is provided with a second sliding groove on one side, the second sliding groove is communicated with the adjusting groove, the first sliding plate 7 and the third sliding plate 23 are both slidingly fitted in the second sliding groove, and the heights of the first sliding plate 7 and the third sliding plate 23 are both greater than the height of the first sliding groove, so as to reduce the probability that the first guide rod 16 and the second guide rod 17 are separated from the arc-shaped groove 9, improve the stability of the second sliding plate 6 and the fourth sliding plate 22 when sliding through the first sliding groove, and improve the stability and reliability of the clamping assembly in operation.

[0050] The utility model is not limited to the above-mentioned embodiment, any person should know that the structural change made under the inspiration of the utility model, any technical scheme with the same or similar utility model falls into the protection scope of the utility model. The utility model does not describe the technology, shape, structure part in detail and is the known technology.

Claims

1. A downhole water spotting borehole blowout prevention device, characterized by, The utility model relates to a rubber ring fixing device, including: The rectangular frame (2) is equipped on the upper end surface of the mounting piece, and the clamping assembly corresponding to the rubber ring (3) is arranged in the rectangular frame (2); The clamping assembly includes a worm wheel (10) and a rotating piece, one end surface of the worm wheel (10) is equipped with a round plate (8), two arc grooves (9) are arranged on the end surface of the round plate (8) away from the worm wheel (10), an adjusting groove is arranged in the rectangular frame (2), a first sliding piece and a second sliding piece are slidably arranged, the worm wheel (10) and the round plate (8) are rotatably arranged in the adjusting groove, a worm gear (11) is arranged on the circumferential side of the rotating piece and engaged with the worm wheel (10), a first guide rod (16) is arranged on one side of the first sliding piece, a second guide rod (17) is arranged on one side of the second sliding piece, the first guide rod (16) and the second guide rod (17) are respectively arranged in the corresponding arc groove (9), and arc blocks (4) are arranged on one end of the first sliding piece and the second sliding piece.

2. A downhole water spotting bore blowout prevention device according to claim 1, characterised in that, The rotating piece includes a connecting rod (12), the worm gear (11) is arranged on the circumferential side of the connecting rod (12), the connecting rod (12) penetrates through the rectangular frame (2) and the adjusting groove in the transverse direction, and a knob (13) is arranged on one end surface of the connecting rod (12).

3. A downhole water cut probe drilling blowout preventer according to claim 2, characterized in that, Bearing is embedded on both sides of the adjusting groove, and the bearing is arranged on the circumferential side of the connecting rod (12).

4. A downhole water cut logging and drilling blowout prevention device according to claim 1, characterized in that, A rotating rod is arranged on one end surface of the worm wheel (10), and a rotating groove is arranged on one side of the adjusting groove, and the rotating rod is rotatably arranged in the rotating groove.

5. A downhole water spotting and drilling blowout prevention device according to claim 1, wherein, The mounting piece includes a base (1), the rectangular frame (2) is arranged on the upper end surface of the base (1), the base (1) is vertically provided with a slot hole and a plurality of through holes, and the rubber ring (3) corresponds to the slot hole.

6. A downhole water cut logging and drilling blowout prevention apparatus according to claim 1, wherein, The first sliding piece includes a first sliding plate (7), the first guide rod (16) is arranged on one side of the first sliding plate (7), a second sliding plate (6) is arranged on one side of the first sliding plate (7), the first sliding plate (7) and the second sliding plate (6) are slidably arranged in the rectangular frame (2), and a first connecting block (14) is arranged between the second sliding plate (6) and the corresponding arc block (4).

7. A downhole water cut logging and drilling blowout prevention apparatus according to claim 6, wherein, The second sliding piece includes a third sliding plate (23), the second guide rod (17) is arranged on one side of the third sliding plate (23), a fourth sliding plate (22) is arranged on one side of the third sliding plate (23), the third sliding plate (23) and the fourth sliding plate (22) are slidably arranged in the rectangular frame (2), and a second connecting block (5) is arranged between the fourth sliding plate (22) and the corresponding arc block (4).

8. A downhole water cut logging and drilling blowout prevention apparatus according to claim 7, wherein, A first sliding groove is arranged on one side of the inner wall of the rectangular frame (2), the second sliding plate (6) and the fourth sliding plate (22) are slidably arranged in the first sliding groove, a second sliding groove is arranged on one side of the first sliding groove, and the first sliding plate (7) and the third sliding plate (23) are slidably arranged in the second sliding groove.

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