A field water injection test drill pipe plugging device with a gas bag

Abstract

This invention discloses a drill pipe plugging device with an airbag for field water injection tests, belonging to the field of geological exploration. It includes a plugging mechanism and a casing. The plugging mechanism is located at the bottom of the casing, and a perforated tube is inserted through both the plugging mechanism and the casing. Several grooves are formed on the outer surface of the perforated tube. This invention achieves pure mechanical transmission through the rotation of the perforated tube, directly driving the airbag ring to axially compress and radially expand for sealing. It eliminates the need for external air pumps, inflation / deflation pipelines, and other auxiliary equipment, significantly simplifying the structure and improving the convenience of field operations. The airbag ring can tightly fit against the casing and the borehole wall, effectively preventing water seepage into the non-test section, ensuring the independent sealing of the test section, and improving the accuracy of soil permeability coefficient testing. Simultaneously, the rotating frame unfolds and presses against the borehole wall, enhancing overall stability. The diaphragm expands the covering gap, effectively preventing sediment from intruding into the internal transmission structure, reducing the probability of failure and extending the device's service life.

Description

Technical Field

[0001] External drilling water injection test conditions and airbag-equipped drill rod plugging device with mechanical drive sealing function are particularly suitable for water conservancy and hydropower projects, geotechnical engineering investigation, geological disaster prevention and control, mining geological exploration, municipal infrastructure construction and hydrogeological investigation in arid and semi-arid regions, etc., and belong to the category of supporting equipment technology for testing the permeability performance of soil and rock layers. Background Technology

[0002] Borehole water injection (seepage) testing is a core and simple method for determining the permeability of rock (soil) layers in field geological exploration. It is also a key technical means to obtain the permeability coefficient and hydrogeological parameters of rock and soil layers, and is widely used in various engineering fields such as dam foundation investigation for water conservancy and hydropower projects, foundation design for geotechnical engineering, geological hazard investigation, hydrological assessment of mining operations, and municipal pipeline network infrastructure construction. Its test principle is basically similar to that of pumping tests. By quantitatively injecting water into the borehole to replace pumping operations, key data such as injection flow rate and water head height are accurately monitored, and then core parameters such as the permeability coefficient of the rock and soil layer are calculated, providing scientific and reliable data support for engineering foundation design, seepage prevention treatment, and hydrogeological evaluation.

[0003] This experimental method is mainly applicable to two typical scenarios: first, arid or semi-arid areas where the groundwater level is deep and on-site conditions are limited, making it difficult to conduct pumping tests; and second, naturally dry, highly permeable rock (soil) layers with low water content. Based on the method of controlling the test head, the injection test can be divided into two main categories: the constant head method and the variable head method. The constant head method is suitable for highly permeable strata such as sand, gravel, and pebble layers, while the variable head method is suitable for weakly permeable strata such as silt, silt, silty clay, and cohesive soil. The variable head method can be further subdivided into two operational forms: the rising head method and the falling head method.

[0004] During actual field water injection tests, a natural annular gap exists between the outer wall of the casing inserted into the borehole and the borehole wall. This gap becomes a natural channel for pore water, groundwater seepage, and surface runoff in the upper soil and rock layers of the non-test section. This causes water from the non-test section to continuously seep into the test section, disrupting the independent hydrological environment of the test section. This severely interferes with the accuracy of test data such as water injection flow rate and water head height, ultimately significantly reducing the accuracy of soil and rock permeability coefficient testing and directly affecting the reliability of the exploration results and the safety of the engineering design.

[0005] The current mainstream borehole plugging technology in the industry mostly adopts the method of installing an airbag seal on the outside of the drill pipe. Compressed air is injected into the airbag through an external dedicated inflation / deflation pipeline and air pump equipment to expand it and block the annular gap between the casing and the borehole wall, thereby achieving spatial isolation between the test section and the non-test section. However, this traditional airbag inflation plugging method has many insurmountable defects in actual field applications: it requires external equipment such as air pumps, inflation / deflation pipelines, and control valves, resulting in poor portability in field operations, cumbersome equipment handling, and time-consuming on-site assembly; the inflation pressure of the airbag is not easy to control accurately, with too low pressure causing seal failure and too high pressure causing damage, resulting in insufficient seal stability; moreover, the transmission structure and sealing parts of the device lack protective measures, making them susceptible to intrusion by mud, sand, and debris from the borehole, which can easily lead to seal failure, equipment jamming, and component wear after long-term use; at the same time, the traditional device has limited hole diameter adaptability and cannot flexibly adapt to different diameter boreholes, resulting in rapid component wear and high maintenance costs, making it difficult to meet the testing requirements of complex field terrain, long-term continuous operation, and high-precision testing.

[0006] Based on the aforementioned industry pain points, there is a need for a field water injection test sealing device that is structurally simple, requires no external equipment, has reliable sealing, is resistant to silt intrusion, and is highly adaptable, in order to solve the technical problems mentioned above. Summary of the Invention

[0007] To address the shortcomings of existing technologies, this invention provides a drill pipe plugging device with an airbag for field water injection tests. It effectively solves the technical problems of traditional airbag plugging devices, such as the need for external air pump equipment, cumbersome field operations, poor sealing stability, susceptibility to mud and sand intrusion and blockage, and limited orifice diameter adaptability. This comprehensively improves the operational efficiency and testing accuracy of field water injection tests.

[0008] Technical solution: To solve the above-mentioned technical problems, according to one aspect of the present invention, more specifically, a drill pipe plugging device with an airbag for field water injection test, comprising a plugging mechanism and a casing, wherein the plugging mechanism is located at the bottom of the casing, and a perforated tube is provided through the plugging mechanism and the casing, wherein a plurality of sliding grooves are provided on the outer surface of the perforated tube, and a plurality of through holes are provided through the sliding grooves.

[0009] The sealing mechanism includes a tube body, a fixed ring integrally formed on the lower surface of the outer surface of the tube body, a rotating seat rotatably connected to the bottom of the tube body, several limiting blocks fixed on the inner side wall of the rotating seat, the limiting blocks being located inside the sliding groove, the tube body being slidably connected to the flower tube through the limiting blocks and the sliding groove, several grooves I being formed on the lower surface of the outer surface of the tube body, and groove II being formed on the outer surface of the outer surface of the tube body above grooves I, the top of the rotating seat being located penetrating into grooves I, several toothed grooves being formed on the outer surface of the top of the rotating seat, a lead screw rotatably connected inside grooves I, a spur gear fixed at the bottom of the lead screw, a lifting block threadedly connected to the outer surface of the lead screw, and a compression ring slidably connected to the outer surface of the tube body, the compression ring being fixedly connected to the lifting block.

[0010] Furthermore, the top of the lead screw extends through to the lower surface of the inner groove two and is fixed with a bevel gear one. A shaft is rotatably connected inside the groove two, and a rotating frame and the bevel gear two are fixed on the outer surface of the shaft. The bottom end of the bevel gear two is meshed with the bevel gear one, and a diaphragm is fixed between two adjacent rotating frames.

[0011] Furthermore, an air bladder ring is fitted onto the outer surface of the tube between the compression ring and the fixing ring.

[0012] Furthermore, the rotary seat is connected to the spur gear via the toothed groove.

[0013] Furthermore, the top of the tube body is integrally formed with a connector, and the top of the sleeve is threadedly connected to the bottom of the sleeve through the connector.

[0014] Furthermore, the airbag ring is made of hydrogenated nitrile rubber or neoprene rubber; the diaphragm is made of butyl rubber or EPDM rubber elastic material.

[0015] Furthermore, the width of the limiting block matches the width of the slide groove, and both the outer surface of the limiting block and the inner wall of the slide groove are smoothly polished.

[0016] Furthermore, the inner wall of the extrusion ring is inlaid with a wear-resistant copper sleeve, and the inner wall of the wear-resistant copper sleeve slides and fits against the outer wall of the tube.

[0017] Furthermore, an anti-slip rubber pad is bonded to the end of the rotating frame away from the shaft, and the surface of the anti-slip rubber pad is provided with concave and convex anti-slip textures.

[0018] The beneficial effects of the drill pipe plugging device with airbag for field water injection tests of the present invention are as follows:

[0019] (1) The present invention is purely mechanical transmission, which makes field operations more convenient. Pure mechanical transmission is achieved by rotating the flower tube, which directly drives the airbag ring to axially compress and radially expand and seal. No external air pump, air filling and deflating pipeline, control valve and other auxiliary equipment are required, which greatly simplifies the structure of the device, reduces the workload of field equipment handling and on-site assembly, and comprehensively improves the convenience of operation under complex field conditions.

[0020] (2) The present invention has reliable sealing and higher testing accuracy. Under axial compression, the airbag ring can tightly fit the casing and the inner wall of the borehole to form a continuous and complete annular sealing barrier, effectively blocking water from non-test section from seeping into the test section, ensuring the sealing independence of the test section, avoiding interference from external water bodies with test data, and greatly improving the testing accuracy of soil and rock permeability coefficient.

[0021] (3) The present invention has strong resistance to mud and sand intrusion and longer equipment life. After the rotating frame is unfolded, it can press against the hole wall to enhance the overall stability. The diaphragm simultaneously expands the annular gap between the covering pipe and the borehole to form an outer protective barrier, which effectively prevents mud, sand and debris from intruding into the internal transmission structure such as the screw and gear, protects the core transmission components, reduces the probability of equipment failure and extends the service life of the device.

[0022] (4) The present invention has strong adaptability and efficient disassembly and assembly. The top adopts a threaded joint design, which can flexibly replace the corresponding specifications of the sealing mechanism according to different drilling diameters, and has a wide range of hole diameter adaptability. The threaded connection method is efficient for installation and disassembly, and the connection part is sealed without gaps. The overall sealing is reliable and the operation is stable, which is more suitable for the use needs of complex terrain in the field and long-term continuous water injection test. Attached Figure Description

[0023] The present invention will now be described in further detail with reference to the accompanying drawings and specific implementation methods.

[0024] Figure 1 This is a schematic diagram of the structure of the present invention;

[0025] Figure 2 This is a front cross-sectional view of the present invention;

[0026] Figure 3 This is a schematic diagram of the internal structure of the present invention;

[0027] Figure 4 For the present invention Figure 3 A magnified structural diagram of point A in the middle;

[0028] Figure 5 This is a schematic diagram of the sealing mechanism in this invention.

[0029] In the diagram: 1. Sleeve; 2. Sealing mechanism; 3. Perforated tube; 4. Slide groove; 5. Through hole; 6. Tube body; 7. Connector; 8. Fixing ring; 9. Rotary seat; 10. Limiting block; 11. Gear groove; 12. Groove one; 13. Groove two; 14. Spur gear; 15. Lead screw; 16. Lifting block; 17. Extrusion ring; 18. Airbag ring; 19. Bevel gear one; 20. Bevel gear two; 21. Shaft; 22. Rotating frame; 23. Diaphragm. Detailed Implementation

[0030] The present invention will be described in detail below with reference to the accompanying drawings and embodiments. It should be noted that, unless otherwise specified, the embodiments and features described in the present application can be combined with each other.

[0031] To make the technical solution of the present invention clearer, the present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0032] Reference Figures 1-5 A drill pipe plugging device with an airbag for field water injection test includes a plugging mechanism 2 and a casing 1. The plugging mechanism 2 is located at the bottom of the casing 1. A perforated tube 3 is installed inside the plugging mechanism 2 and the casing 1. Several grooves 4 are opened on the outer surface of the perforated tube 3. Several through holes 5 are opened inside the grooves 4. Water is injected into the base hole through the through holes 5 of the perforated tube 3.

[0033] The sealing mechanism 2 includes a tube body 6. A fixing ring 8 is integrally formed on the lower outer surface of the tube body 6. A rotating seat 9 is rotatably connected to the bottom of the tube body 6. Several limiting blocks 10 are fixed on the inner side wall of the rotating seat 9. The limiting blocks 10 are located inside the slide groove 4. The width of the limiting blocks 10 matches the width of the slide groove 4. The outer surface of the limiting blocks 10 and the inner wall of the slide groove 4 are both smoothly polished, which can significantly reduce the frictional resistance when the tube rotates and moves axially, avoid transmission jamming, and ensure the smoothness and stability of mechanical transmission. The tube body 6 is slidably connected to the tube 3 through the limiting blocks 10 and the slide groove 4. Several grooves 12 are opened on the lower outer surface of the tube body 6. The outer surface of the tube body 6 is located on the grooves 12. The square opening has a second groove 13. The top of the rotating seat 9 is located inside the groove 12. Several toothed grooves 11 are opened on the outer surface of the top of the rotating seat 9. A lead screw 15 is rotatably connected inside the groove 12. A spur gear 14 is fixed at the bottom of the lead screw 15. A lifting block 16 is threadedly connected to the outer surface of the lead screw 15. A compression ring 17 is slidably connected to the outer surface of the tube body 6. A wear-resistant copper sleeve is embedded in the inner wall of the compression ring 17. The inner wall of the wear-resistant copper sleeve is slidably fitted with the outer wall of the tube body 6. The wear-resistant copper sleeve has excellent wear resistance and self-lubricating properties. It is not easy to wear and jam after long-term use, which effectively improves the smoothness of the lifting action of the compression ring and extends the service life of the transmission components. The compression ring 17 and the lifting block 16 are fixedly connected.

[0034] The top of the lead screw 15 extends through the lower surface of the inner groove 13 and is fixed with a bevel gear 19. A shaft 21 is rotatably connected inside the groove 13. A rotating frame 22 and a bevel gear 20 are fixed on the outer surface of the shaft 21. The bottom end of the bevel gear 20 meshes with the bevel gear 19. A diaphragm 23 is fixed between two adjacent rotating frames 22. An anti-slip rubber pad is attached to the end of the rotating frame 22 away from the shaft 21. The surface of the anti-slip rubber pad has a textured anti-slip pattern, which can increase the contact friction between the rotating frame and the inner wall of the borehole, prevent the device from rotating circumferentially or moving axially during the test, and enhance the overall fixing effect.

[0035] Preferably, an airbag ring 18 is fitted on the outer surface of the tube body 6 between the compression ring 17 and the fixing ring 8.

[0036] Preferably, the rotary seat 9 is connected to the spur gear 14 through the toothed groove 11, and the drive can be realized by rotating the flower tube 3. There is no need to set up a pipe to connect the airbag ring 18, nor is there a need to set up an additional air pump or other inflation / deflation equipment.

[0037] Preferably, the top of the tube body 6 is integrally formed with a connector 7, and the top of the sleeve 1 is threadedly connected to the bottom of the sleeve 1 through the connector 7, so that the sealing mechanism 2 of different sizes and specifications can be replaced when the drilling diameter is different.

[0038] Preferably, the airbag ring 18 is made of hydrogenated nitrile rubber or neoprene rubber; it has high elasticity, good pressure-bearing expansion and watertight sealing properties, and can expand radially under axial compression to achieve annular sealing between the sleeve 1 and the perforated tube 3.

[0039] The diaphragm 23 is made of butyl rubber or EPDM rubber elastic material; it has good flexibility and elastic recovery ability, and can be expanded and retracted synchronously with the rotating frame 22 to achieve dust prevention, mud and sand intrusion prevention and auxiliary sealing.

[0040] Workflow:

[0041] S1. Equipment assembly and deployment

[0042] The sleeve 1 is precisely connected to the sealing mechanism 2 through the top connector 7 and screwed tightly to ensure that the connection is sealed without gaps. After that, the assembled sleeve 1 and sealing mechanism 2 are smoothly lowered into the preset borehole. During the lowering process, the device is kept in the center and avoids scraping and collision with the borehole wall to prevent damage to the components. After the sealing mechanism 2 reaches the designated position of the borehole test section, the perforated tube 3 is slowly inserted along the central axis of the sleeve 1 until the bottom end of the perforated tube 3 extends into the interior of the sealing mechanism 2. At the same time, the sliding groove 4 on the outer wall of the perforated tube 3 is precisely matched and engaged with the limiting block 10 on the inner side of the rotating seat 9 of the sealing mechanism 2, so that the limiting block 10 is completely embedded in the sliding groove 4, realizing the circumferential limiting and transmission linkage between the perforated tube 3 and the rotating seat 9.

[0043] S2, Sealing and Support Deployment

[0044] Ground workers use special tools to smoothly control the flower tube 3 to make directional rotation. When the flower tube 3 rotates, the sliding groove 4 and the limiting block 10 drive the rotating seat 9 to rotate synchronously. The toothed groove 11 on the outer periphery of the top of the rotating seat 9 rotates continuously with the rotating seat and maintains a stable meshing state with the spur gear 14, smoothly transmitting the circumferential rotation of the flower tube 3 to the lead screw 15, driving the lead screw 15 to make directional rotation inside the groove 12, completing the first stage of rotational power transmission.

[0045] During the continuous rotation of the lead screw 15, its external thread and the internal thread of the lifting block 16 form a helical transmission pair, driving the lifting block 16 to move smoothly downward along the axis of the lead screw 15. The lifting block 16 simultaneously pulls the compression ring 17, which is fixed to it, to move smoothly downward along the outer wall of the pipe body 6. During the downward movement of the compression ring 17, it continuously applies uniform axial pressure to the airbag ring 18. Under the bidirectional clamping and compression of the compression ring 17 and the fixed ring 8, the airbag ring 18 undergoes radial expansion deformation, gradually expanding outward and tightly fitting the outer wall of the casing 1 and the borehole wall, forming a complete and continuous annular sealing barrier at the bottom of the test section. This completely blocks the water from the non-test section from seeping downward along the annular gap and the water from the test section from flowing upward, ensuring the independence of the hydrological environment of the test section.

[0046] While the lead screw 15 rotates to drive the airbag ring seal, its top bevel gear 19 rotates synchronously and forms a stable bevel gear transmission pair with the second bevel gear 20, converting the vertical rotational motion into the horizontal rotational motion, which in turn drives the shaft 21 to rotate inside the second groove 13. The shaft 21 drives the rotating frame 22, which is fixed to the outer periphery, to rotate outward synchronously around the shaft 21. After the rotating frame 22 is unfolded, it gradually approaches the borehole wall until the end of the rotating frame 22 is tightly pressed against the surface of the borehole wall, forming a multi-point support and fixing structure. This effectively counteracts the shaking and displacement caused by the water flow impact during water injection, and avoids problems such as uneven force and sealing gaps in the airbag ring 18 due to device shaking.

[0047] At the same time, the synchronously deployed rotating frame 22 fully expands the adjacent diaphragms 23. The diaphragms 23 cover the annular gap between the tube body 6 and the borehole, forming an outer protective barrier. This effectively prevents mud, sand, and debris from entering the internal transmission structure such as the screw and gear, avoiding component jamming and wear, and ensuring the long-term stable operation of the device.

[0048] S3, Testing and Reset Disassembly

[0049] After the sealing and support structure is deployed, a water injection test can be carried out through the perforated tube 3. After the test is completed, the perforated tube 3 is rotated in the opposite direction to drive the extrusion ring to move upward and the airbag ring to retract and reset. The rotating frame and diaphragm are simultaneously retracted. Then, the perforated tube, sleeve and sealing mechanism are removed in sequence to complete the disassembly of the device. The overall operation is simple and efficient.

[0050] Example 1: Water Injection Test of Conventional Diameter Borehole in Highly Permeable Formation

[0051] This embodiment is applicable to field constant water head water injection tests in sandy and gravelly highly permeable strata with a borehole diameter of Φ110mm.

[0052] Device selection: The sealing mechanism is selected to match the Φ110mm borehole. The airbag ring is made of hydrogenated nitrile rubber and the diaphragm is made of butyl rubber. The inner wall of the extrusion ring is inlaid with a standard wear-resistant copper sleeve and the end of the rotating frame is bonded with a 3mm thick anti-slip rubber pad.

[0053] Assembly and lowering: Secure the casing and the plugging mechanism with the joint thread, and lower the whole assembly into the borehole to the designed depth of the test section; insert the perforated pipe along the center of the casing so that the limiting block and the sliding groove can be precisely engaged.

[0054] Operating procedure: The ground rotates the flower tube clockwise, the rotating seat rotates synchronously and drives the lead screw to rotate, the lifting block drives the extrusion ring to move downward, the airbag ring is subjected to axial compression and expands radially, tightly fitting the outer wall of the sleeve and the hole wall; at the same time, the bevel gear pair drives the rotating frame to unfold and press against the hole wall, and the diaphragm is fully opened for protection.

[0055] Test results: The annular gap was completely sealed, no water seeped into the non-test section, the water injection flow rate was stable, and the permeability coefficient test error was ≤3%; after 8 hours of continuous operation, there was no mud or sand jamming in the transmission components, and the device operated smoothly.

[0056] Example 2: Water Injection Test in Large-Diameter Borehole and Weakly Permeable Formation

[0057] This embodiment is applicable to field variable head water injection tests in silty clay strata with a borehole diameter of Φ150mm.

[0058] Device selection: A large-scale sealing mechanism is adopted, the airbag ring is made of neoprene rubber (to improve creep resistance), and the diaphragm is made of EPDM rubber; the limit block and slide are polished with high precision to reduce transmission resistance.

[0059] Assembly and lowering: After the sleeve is connected to the sealing mechanism, it is slowly lowered into the hole to avoid collision with the hole wall and causing clay to fall off; when the perforated tube is inserted, ensure that the slide groove and the limit block are coaxially aligned.

[0060] Operation process: The rotating flower tube drives the sealing and support mechanism to unfold, and the air bladder ring expands to form a flexible seal, which adapts to the micro-deformation characteristics of the clay hole wall; the rotating frame provides multi-point support to counteract water flow pulsation, and the diaphragm prevents clay debris from intruding.

[0061] Test results: The sealing structure is stable and does not leak pressure; the hydrological environment of the test section is independent; the head decay data are true and reliable; when the device is lifted, the flower tube rotates in the opposite direction, and the air bag ring and the rotating frame quickly reset without any stuck drill.

[0062] Example 3: Harsh Environment and Long-Term Continuous Operation

[0063] This embodiment is applicable to field water injection tests in mountainous areas with complex strata, high sand content, and long-term continuous exploration.

[0064] Device selection: The airbag ring is made of hydrogenated nitrile rubber (water-resistant, oil-resistant, and anti-aging), and the diaphragm is made of EPDM rubber; all transmission gears and lead screws are surface hardened to improve wear resistance and corrosion resistance.

[0065] Key enhancements: Solid lubricant is applied to the contact surface between the limit block and the slide groove; the wear-resistant copper sleeve of the extrusion ring is thickened to 5mm; and the anti-slip pad of the rotating frame adopts a highly wear-resistant corrugated structure.

[0066] Operation process: Follow the standard procedure to complete the lowering, rotating sealing, and support deployment; no maintenance is required during the test, as the diaphragm continuously prevents high-sand-content water from entering the interior.

[0067] Test results: No faults were observed during 72 hours of continuous operation; the airbag rings remained intact and the seals did not fail; the wear of the transmission components was less than 0.1 mm, meeting the requirements for long-term field surveys.

[0068] The embodiments described above are merely illustrative of several implementations of the present invention, and while the descriptions are specific and detailed, they should not be construed as limiting the scope of the present invention. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of the present invention, and these modifications and improvements all fall within the scope of protection of the present invention. Therefore, the scope of protection of this patent should be determined by the appended claims.

Claims

1. A drill pipe plugging device with an air bladder for field water injection tests, comprising a plugging mechanism (2) and a casing (1), characterized in that: The sealing mechanism (2) is located at the bottom of the sleeve (1). The sealing mechanism (2) and the sleeve (1) are connected by a perforated tube (3). The outer surface of the perforated tube (3) is provided with several grooves (4). Several through holes (5) are provided inside the grooves (4). The sealing mechanism (2) includes a tube body (6), a fixing ring (8) integrally formed on the lower outer surface of the tube body (6), a rotating seat (9) rotatably connected to the bottom of the tube body (6), and several limiting blocks (10) fixed on the inner side wall of the rotating seat (9). The limiting blocks (10) are located inside the sliding groove (4). The tube body (6) is slidably connected to the flower tube (3) through the limiting blocks (10) and the sliding groove (4). Several grooves (12) are opened on the lower outer surface of the tube body (6). The outer surface of the tube body (6) is located in the groove. A groove 2 (13) is provided above the groove 1 (12). The top of the rotating seat (9) is located inside the groove 1 (12). Several toothed grooves (11) are provided on the outer surface of the top of the rotating seat (9). A lead screw (15) is rotatably connected inside the groove 1 (12). A spur gear (14) is fixed at the bottom of the lead screw (15). A lifting block (16) is threadedly connected to the outer surface of the lead screw (15). A compression ring (17) is slidably connected to the outer surface of the tube body (6). The compression ring (17) is fixedly connected to the lifting block (16).

2. The drill pipe plugging device with airbag for field water injection testing according to claim 1, characterized in that: The top end of the lead screw (15) extends through the lower surface of the inner groove (13) and is fixed with a bevel gear (19). A shaft (21) is rotatably connected inside the groove (13). A rotating frame (22) and the bevel gear (20) are fixed on the outer surface of the shaft (21). The bottom end of the bevel gear (20) meshes with the bevel gear (19). A diaphragm (23) is fixed between two adjacent rotating frames (22).

3. The drill pipe plugging device with airbag for field water injection testing according to claim 1, characterized in that: An airbag ring (18) is fitted on the outer surface of the tube (6) between the extrusion ring (17) and the fixing ring (8).

4. The drill pipe plugging device with airbag for field water injection testing according to claim 1, characterized in that: The rotating base (9) is connected to the spur gear (14) through the tooth groove (11).

5. A drill pipe plugging device with an airbag for field water injection testing according to claim 1, characterized in that: The top of the tube body (6) is integrally formed with a connector (7), and the top of the sleeve (1) is threadedly connected to the bottom of the sleeve (1) through the connector (7).

6. The drill pipe plugging device with airbag for field water injection testing according to claim 1, characterized in that: The airbag ring (18) is made of hydrogenated nitrile rubber or chloroprene rubber; the diaphragm (23) is made of butyl rubber or EPDM rubber elastic material.

7. A drill pipe plugging device with an airbag for field water injection testing according to claim 1, characterized in that: The width of the limiting block (10) matches the width of the groove (4), and the outer surface of the limiting block (10) and the inner wall of the groove (4) are both smooth polished.

8. A drill pipe plugging device with an air bladder for field water injection testing according to claim 1, characterized in that: The inner wall of the extrusion ring (17) is inlaid with a wear-resistant copper sleeve, and the inner wall of the wear-resistant copper sleeve slides and fits against the outer wall of the tube body (6).

9. A drill pipe plugging device with an airbag for field water injection testing according to claim 1, characterized in that: The end of the rotating frame (22) away from the shaft (21) is attached with an anti-slip rubber pad, and the surface of the anti-slip rubber pad is provided with concave and convex anti-slip texture.

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