Sealing tool capable of being slidably inserted into gas-lift lifting efficient liquid drainage drill rod
By introducing a stepped limiting structure and a multiple sealing structure into the insertion sealing device, the position control and sliding problems of the deep water well downhole sealing device were solved, the sealing performance was stabilized, the service life of the sealing device was extended, and the maintenance cost was reduced.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-04-23
- Publication Date
- 2026-04-14
AI Technical Summary
When existing insertion sealing devices are used in deep water wells, the lack of a stepped limiting structure leads to inaccurate position control, insufficient sliding sealing performance, easy damage to the one-way sealing ring, and insufficient multi-seal structure, resulting in unstable sealing performance and increased maintenance frequency and cost.
The design incorporates a multi-layered sealing structure, including a stepped limiting structure, a sliding seal, a bidirectional reciprocating elastic sealing ring, and a PTFE sealing packing, to ensure that the insertion sealing device maintains good sealing performance under high pressure and extends its service life.
This technology enables efficient sealing of the insertion sealing device in deep water wells, reducing equipment maintenance costs and downtime, and improving the durability and pressure resistance of the seals.
Smart Images
Figure CN224120225U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to a slidingly insertable sealing tool inside a gas lift high-efficiency fluid drainage drill pipe, which is a tubing string accessory tool for gas lift oil production in oil fields and belongs to the category of oilfield downhole tools. Background Technology
[0002] With the deepening of exploration and development, large-scale heavy oil reservoirs have been discovered in the eastern South China Sea oilfields, including the Wenchang Formation and Enping Formation in the Huizhou and Lufeng blocks, with proven geological reserves exceeding 200 million tons. However, early conventional testing of these reservoirs has not yielded ideal results, and production capacity in some blocks has not achieved significant breakthroughs. Wells such as LF13-9-1 and LF15-5-1Sa are particularly notable examples, where the main problem lies in the lack of efficient artificial lift technology for deep, low-permeability heavy oil.
[0003] Existing conventional formation testing techniques and technologies are insufficient to meet the testing requirements of deep and heavy oil reservoirs, potentially hindering testing operations and making it difficult to obtain the reservoir's true productivity and determine reservoir fluid properties. If this issue is not addressed before subsequent testing operations in such reservoirs, it will affect data acquisition and operational timeliness, negatively impacting exploration and evaluation.
[0004] With the increasing number of hydraulic fracturing test wells in the deep, low-porosity, and low-permeability reservoirs of the eastern South China Sea, and the discovery of large-scale heavy oil reservoirs in Enping, Panyu, and Lufeng oilfields, it is necessary to address the aforementioned problems and meet the requirements of testing operations such as efficient fluid removal via artificial lift. This necessitates research into gas lift fluid removal technology, building upon existing testing techniques, to develop a comprehensive set of technologies for testing deep, low-permeability, and heavy oil reservoirs in the eastern South China Sea, effectively solving the aforementioned operational challenges. Since the minimum outer diameter of a conventional packer is 95.16 mm, much larger than the inner diameter of the drill pipe joint, a packer cannot be directly selected. Therefore, a structure combining a drill pipe sealing cylinder and an insert seal is adopted to seal the annulus between the drill pipe and the tubing during gas lift. Furthermore, when the insert seal is subjected to gas pressure, the sliding of the insert seal head within the insert seal cylinder eliminates the influence of gas pressure, improving production efficiency and ensuring the continuity of production from hydraulic fracturing test wells in the deep, low-porosity, and low-permeability reservoirs of the eastern South China Sea. Therefore, the research and application of insertion sealing device technology has become an important area of focus for the oil and gas industry.
[0005] Currently, the insertion sealing device has reached a relatively mature stage, but many problems still exist in actual downhole operations:
[0006] (1) No step limit structure is set. Step limit is usually used to ensure that the device stops or moves in a specific position. Removing these limits may make it difficult to accurately control the position and movement of the insertion sealing device. This may affect the precision and accuracy of the insertion sealing device during downhole operations. Without a definite stop point or limit, the operator may need to pay more attention to control the movement of the device, which may increase the risk of error.
[0007] (2) It cannot perform sliding seal. When the insertion sealing device is working in deep water well, if it cannot use its own sliding margin to eliminate the pressure when subjected to large pressure, it will be more susceptible to damage if it relies solely on its own materials and structure to withstand the pressure, thus shortening the life of the insertion sealing device and increasing maintenance costs.
[0008] (3) Most insertion sealing devices use individual or integrated V-rings for sealing. When the pressure is high in deep water wells, such seals are difficult to withstand high pressure, which will affect their sealing performance. One-way seals may be more susceptible to damage and wear under frequent movement and friction, which may shorten the life of the insertion sealing device and increase the maintenance frequency. In addition, one-way seals may be relatively poor in adapting to different working environments, and may require more customized designs to adapt to various pressure and temperature conditions.
[0009] (4) The lack of a multi-seal structure will make the performance of the seals unstable under high temperature or high pressure, leading to an increased risk of leakage; and it will also make the seals more susceptible to damage and wear, thus requiring more frequent maintenance and replacement of the seals, increasing the maintenance cost and downtime of the equipment.
[0010] Therefore, it is necessary to design a multi-seal structure that can simultaneously satisfy step limiting, sliding sealing, and the alternating arrangement of bidirectional reciprocating elastic sealing rings and PTFE sealing packing. This will improve the sealing performance, enhance the pressure-bearing capacity of the insertion sealing device, reduce damage to the sealing components, increase the service life of the insertion sealing device, and reduce equipment maintenance costs. Utility Model Content
[0011] The purpose of this invention is to overcome the shortcomings of the prior art and provide a sliding insertion sealing tool for high-efficiency air-lifted drainage drill pipe. It features a stepped limiting structure, a sliding seal, and a multi-seal structure formed by alternating bidirectional reciprocating elastic sealing rings and polytetrafluoroethylene sealing packing to meet the requirements for insertion sealing devices in deep-water operations. The stepped limit structure prevents further pressure or force from being applied, thus avoiding overload operation, extending equipment life, and controlling the precise position of mechanical parts, stopping them at specific locations. It also allows for initial precise positioning during the initial insertion of the sealing head, avoiding blind insertion. Using multiple sealing sections allows sufficient sliding margin for the inserted sealing device. When the inserted sealing head is subjected to gas pressure, it will slide to eliminate the influence of the gas pressure. Multiple sealing sections ensure that at least two sealing sections form a seal within the inserted sealing cylinder when the inserted sealing head slides, guaranteeing a sealing effect. The use of bidirectional reciprocating elastic sealing rings effectively provides bidirectional sealing, maintaining good sealing performance both internally and externally under pressure. It can also withstand significant friction and reciprocating motion without damage, helping to extend the service life of the sealing device, reducing the frequency of seal replacement, and adapting to different pressure and temperature conditions, providing stable sealing performance. The multi-seal structure provides higher durability and pressure resistance, ensuring stable performance of the seals under high temperature or high pressure environments, reducing the risk of leakage, and also reducing seal damage and wear, thus reducing equipment maintenance costs and downtime.
[0012] To achieve the above objectives, this utility model employs the following technical solution:
[0013] A sliding insertion sealing tool for high-efficiency air-lift and fluid-draining drill pipes is characterized by comprising: an oil pipe connector, a drill pipe upper connector, an insertion sealing head, an insertion sealing cylinder, a pressure ring I, a polytetrafluoroethylene (PTFE) sealing packing, a pressure cap I, an intermediate spacer ring, a bidirectional reciprocating elastic sealing ring, a drill pipe lower connector, a pressure ring II, and a pressure cap II. The upper circumference of the insertion sealing cylinder has a drill pipe upper connector, and the upper end of the inner hole of the drill pipe upper connector has a drill pipe internal thread for connection with the drill pipe. The insertion sealing head has five grooves. One end of the pressure ring II is flat, and the other end is a convex V-shaped surface. The upper and lower ends of the bidirectional reciprocating elastic sealing ring are concave V-shaped surfaces, and one end of the pressure ring I is flat, and the other end is a concave V-shaped surface. The PTFE sealing packing has a V-shaped structure. In the groove of the insertion sealing head, from top to bottom, a set of pressure ring I, three PTFE sealing packings, a middle spacer ring, and then three PTFE sealing packings in the opposite direction are added. Finally, a set of pressure cap I is added. In the next groove, a set of pressure ring II, a bidirectional reciprocating elastic sealing ring, and a set of pressure cap II are installed. There is a drill rod lower connector on the lower outer circle of the insertion sealing cylinder. The drill rod lower connector has a drill rod external thread for connecting with the drill rod. There is an oil pipe connector at the upper end of the insertion sealing head. The upper end of the inner hole of the oil pipe connector has an oil pipe internal thread for connecting the insertion sealing head and the oil pipe before it is lowered into the insertion sealing cylinder.
[0014] Furthermore, the bidirectional reciprocating elastic sealing ring includes an Aflas rubber outer ring, a steel wire, and a PTFE rubber inner ring. The bidirectional reciprocating elastic sealing ring has a double V-shaped structure, with its upper and lower ends being concave V-shaped surfaces. The steel wire is fixed between the Aflas rubber outer ring and the PTFE rubber inner ring and is evenly distributed. The sealing structure formed by each set of bidirectional reciprocating elastic sealing rings includes a set of pressure rings II, a bidirectional reciprocating elastic sealing ring, and a set of pressure caps II.
[0015] Furthermore, the PTFE sealing packing is installed on the groove of the insertion sealing head, and the sealing structure formed by each set of PTFE sealing packing includes a set of pressure ring I, six PTFE sealing packings, an intermediate spacer ring, and a set of pressure cap I.
[0016] Furthermore, the sealing structure formed by the polytetrafluoroethylene sealing packing and the sealing structure formed by the bidirectional reciprocating elastic sealing ring are alternately arranged on the groove of the inserted sealing head, for a total of five sealing sections, of which three are formed by the polytetrafluoroethylene sealing packing and two are formed by the bidirectional reciprocating elastic sealing ring.
[0017] Furthermore, there is a limiting step between the oil pipe joint of the insertion sealing head and the first sealing section, which is the outer step of the insertion sealing head, and there is an inner step at the lower part of the drill pipe joint of the insertion sealing cylinder, which is the inner step of the insertion sealing cylinder. The two steps are used for subsequent limiting functions.
[0018] Furthermore, the aforementioned air-lift high-efficiency fluid drainage drill pipe sliding insertion sealing tool comprises, from top to bottom and from outside to inside, an alternating arrangement of a sealing structure formed by a drill pipe upper joint, an insertion sealing cylinder, a drill pipe lower joint, an oil pipe joint, an insertion sealing head, a sealing structure formed by a polytetrafluoroethylene sealing packing, and a sealing structure formed by a bidirectional reciprocating elastic sealing ring. The drill pipe upper joint and the drill pipe lower joint are respectively connected to the drill pipe. After the insertion sealing head is connected to the oil pipe through the oil pipe joint, it is lowered into the insertion sealing cylinder starting from the drill pipe upper joint. After the outer step of the insertion sealing head contacts the inner step of the insertion sealing cylinder, the insertion sealing device is installed.
[0019] After adopting the above technical solution, the present invention has the following beneficial effects:
[0020] 1. Setting a stepped limit structure can prevent the continued application of pressure or force, thereby avoiding overload operation, extending equipment life, and can also be used to control the precise position of mechanical parts, stopping them at a specific position. It can achieve preliminary precise positioning when the sealing head is first lowered, avoiding blind lowering.
[0021] 2. Using multiple sealing sections allows for sufficient sliding margin in the insertion sealing device. When the insertion sealing head is subjected to gas pressure, it will slide a certain amount to eliminate the influence of gas pressure. Multiple sealing sections can still form a seal inside the insertion sealing cylinder when the insertion sealing head slides, ensuring the sealing effect.
[0022] 3. The use of bidirectional reciprocating sealing rings can effectively provide bidirectional sealing, that is, under pressure, it can maintain good sealing performance both inside and outside, and can withstand large friction and reciprocating motion without damage, which helps to extend the service life of the sealing device, reduce the frequency of seal replacement, and can adapt to working environments under different pressure and temperature conditions, providing stable sealing performance.
[0023] 4. The sealing structure formed by alternating the sealing structure of PTFE sealing packing and the sealing structure formed by bidirectional reciprocating elastic sealing rings provides a multi-layer sealing structure, which can provide higher durability and pressure resistance, ensure the stable performance of the seals under high temperature or high pressure environments, reduce the risk of leakage, and also reduce the damage and wear of the seals, thereby reducing equipment maintenance costs and downtime. Attached Figure Description
[0024] Figure 1 This is a schematic diagram of the structure of this utility model;
[0025] Figure 2 This is a partial enlarged view of the head structure (18) of this utility model;
[0026] Figure 3This is a schematic diagram of the structure of the bidirectional reciprocating elastic sealing ring of this utility model;
[0027] Figure 4 This is a partial enlarged view of the bidirectional reciprocating elastic combined sealing structure (17) of this utility model;
[0028] Figure 5 This is a partial enlarged view of the polytetrafluoroethylene sealing packing combination sealing structure (13) of this utility model;
[0029] In the diagram, 1-oil pipe joint, 2-drill pipe upper joint, 3-insertion sealing head, 4-insertion sealing cylinder, 5-pressure ring I, 6-PTFE sealing packing, 7-pressure cap I, 8-intermediate spacer ring, 9-bidirectional reciprocating elastic sealing ring, 10-drill pipe lower joint, 11-pressure ring II, 12-pressure cap II, 13-PTFE sealing packing combination sealing structure, 14-Aflas rubber outer ring, 15-steel wire, 16-PTFE rubber inner ring, 17-bidirectional reciprocating elastic combination sealing structure, 18-insertion sealing device head structure, 19-insertion sealing cylinder inner step, 20-insertion sealing head outer step. Detailed Implementation
[0030] The technical solution of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of this utility model.
[0031] In the description of this utility model, it should be noted that the directions or positional relationships indicated by terms such as "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer" are based on the directions or positional relationships shown in the accompanying drawings and are only for the convenience of describing this utility model and simplifying the description. They do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation on this utility model. Furthermore, terms such as "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.
[0032] Furthermore, the technical features involved in the different embodiments of this utility model described below can be combined with each other as long as they do not conflict with each other.
[0033] like Figures 1-5As shown, a sliding insertion sealing tool for a high-efficiency air-lifted drain drill pipe is composed of an oil pipe connector (1), a drill pipe upper connector (2), an insertion sealing head (3), an insertion sealing cylinder (4), a pressure ring I (5), a polytetrafluoroethylene sealing packing (6), a pressure cap I (7), an intermediate spacer ring (8), a bidirectional reciprocating elastic sealing ring (9), a drill pipe lower connector (10), a pressure ring II (11), and a pressure cap II (12). The upper outer circle of the insertion sealing cylinder (4) has a drill pipe upper connector (2), and the upper end of the inner hole of the drill pipe upper connector (2) has a drill pipe internal thread for connection with the drill pipe. The insertion sealing head (3) has five grooves. One end of the pressure ring II (11) is a flat surface, and the other end is a convex V-shaped surface. The upper and lower ends of the bidirectional reciprocating elastic sealing ring (9) are concave V-shaped surfaces, and one end of the pressure ring I (5) is a flat surface, and the other end is a concave V-shaped surface. The PTFE sealing packing (6) has a V-shaped structure. In the groove of the insertion sealing head (3), a set of pressure ring I (5), three PTFE sealing packings (6), a middle spacer ring (8) are installed from top to bottom. Then, three PTFE sealing packings (6) are added in the opposite direction. Finally, a set of pressure cap I (7) is added. In the next groove, a set of pressure ring II (11), a bidirectional reciprocating elastic sealing ring (9) and a set of pressure cap II (12) are installed. There is a drill rod lower connector (10) on the lower outer circle of the insertion sealing cylinder (4). The drill rod lower connector has a drill rod external thread, which is used to connect with the drill rod. There is an oil pipe connector (1) at the upper end of the insertion sealing head (3). The upper end of the inner hole of the oil pipe connector (1) has an oil pipe internal thread, which is used to connect the insertion sealing head (3) with the oil pipe and then lower it into the insertion sealing cylinder (4).
[0034] like Figures 1-4 As shown, the bidirectional reciprocating elastic sealing ring (9) includes an Aflas rubber outer ring (15), a steel wire (14), and a PTFE rubber inner ring (16). The bidirectional reciprocating elastic sealing ring (9) has a double V-shaped structure, with concave V-shaped surfaces at its upper and lower ends. The steel wire (14) is fixed between the Aflas rubber outer ring (15) and the PTFE rubber inner ring (16) and is evenly distributed. The sealing structure formed by each set of bidirectional reciprocating elastic sealing rings (9) includes a set of pressure rings II (11), a bidirectional reciprocating elastic sealing ring (9), and a set of pressure caps II (12).
[0035] like Figure 1 and Figure 5 As shown, the polytetrafluoroethylene sealing packing (6) is installed on the groove of the insertion sealing head. The sealing structure formed by each set of polytetrafluoroethylene sealing packing (6) includes a set of pressure ring I (5), six polytetrafluoroethylene sealing packings (6), a middle spacer ring (8), and a set of pressure cap I (7).
[0036] like Figures 1-5As shown, the sealing structure formed by the polytetrafluoroethylene sealing packing (6) and the sealing structure formed by the bidirectional reciprocating elastic sealing ring (9) are alternately arranged on the groove of the insertion sealing head (3), totaling five sealing sections, of which three are formed by the polytetrafluoroethylene sealing packing (6) and two are formed by the bidirectional reciprocating elastic sealing ring (9).
[0037] like Figure 2 As shown, the head structure (18) of the air-lift high-efficiency fluid discharge drill pipe with slidable insertion sealing tool is an enlarged schematic diagram of the assembly of the oil pipe joint (1), the upper joint of the drill pipe (2), the outer step (20) of the insertion sealing head and the inner step (19) of the insertion sealing cylinder.
[0038] like Figures 1-2 As shown, there is a limiting step between the oil pipe joint (1) of the insertion sealing head (3) and the first sealing section, which is the outer step (20) of the insertion sealing head. There is an inner step at the bottom of the drill pipe joint (2) of the insertion sealing cylinder (4), which is the inner step (19) of the insertion sealing cylinder. The two steps are used for subsequent limiting functions.
[0039] like Figures 1-5 As shown, the air-lift high-efficiency fluid drainage drill pipe sliding insertion sealing tool has, from top to bottom and from outside to inside, a sealing structure formed by the upper joint (2) of the drill pipe, the insertion sealing cylinder (4), the lower joint (10) of the drill pipe, the oil pipe joint (1), the insertion sealing head (3), the polytetrafluoroethylene sealing packing (6), and a sealing structure formed by the bidirectional reciprocating elastic sealing ring (9) arranged alternately. The upper joint (2) of the drill pipe and the lower joint (10) of the drill pipe are connected to the drill pipe respectively. After the insertion sealing head (3) is connected to the oil pipe through the oil pipe joint (1), it is inserted into the insertion sealing cylinder (4) from the upper joint (2) of the drill pipe. After the outer step (20) of the insertion sealing head contacts the inner step (19) of the insertion sealing cylinder, the insertion sealing device is installed.
[0040] Obviously, the above embodiments are merely illustrative examples for clear explanation and are not intended to limit the implementation. Those skilled in the art can make other variations or modifications based on the above description. It is neither necessary nor possible to exhaustively list all possible implementations here. However, obvious variations or modifications derived therefrom are still within the protection scope of this invention.
Claims
1. A slidable sealing tool for high-efficiency air-lift drainage drill pipe, characterized in that: It comprises a tubing connector (1), a drill pipe upper connector (2), an insertion sealing head (3), an insertion sealing cylinder (4), a pressure ring I (5), a polytetrafluoroethylene sealing packing (6), a pressure cap I (7), an intermediate spacer ring (8), a bidirectional reciprocating elastic sealing ring (9), a drill pipe lower connector (10), a pressure ring II (11), and a pressure cap II (12). The upper outer circle of the insertion sealing cylinder (4) has a drill pipe upper connector (2), and the upper end of the inner hole of the drill pipe upper connector (2) has a drill pipe internal thread, which is used to connect with the drill pipe. The insertion sealing head (3) has five grooves. The upper and lower ends of the pressure ring II (11) are a plane and a convex V-shaped surface, respectively. The upper and lower ends of the bidirectional reciprocating elastic sealing ring (9) are concave V-shaped surfaces, respectively. The upper and lower ends of the pressure ring I (5) are a plane and a concave V-shaped surface, respectively. The polytetrafluoroethylene sealing packing is... The root (6) has a V-shaped structure. In the groove of the insertion sealing head (3), a set of pressure ring I (5), three polytetrafluoroethylene sealing packings (6), a middle spacer ring (8) are installed from top to bottom. Then, three polytetrafluoroethylene sealing packings (6) are added in the opposite direction to the previous ones. Finally, a set of pressure cap I (7) is added. In the next groove, a set of pressure ring II (11), a bidirectional reciprocating elastic sealing ring (9) and a set of pressure cap II (12) are installed. There is a drill rod lower connector (10) on the outer circle of the lower end of the insertion sealing cylinder (4). The drill rod lower connector has a drill rod external thread, which is used to connect with the drill rod. There is an oil pipe connector (1) at the upper end of the insertion sealing head (3). The upper end of the inner hole of the oil pipe connector (1) has an oil pipe internal thread, which is used to connect the insertion sealing head (3) with the oil pipe. After connection, it is lowered into the insertion sealing cylinder (4).
2. The slidable sealing tool for high-efficiency drainage drill pipe with air lift as described in claim 1, characterized in that: The bidirectional reciprocating elastic sealing ring (9) includes an Aflas rubber outer ring (15), a steel wire (14), and a PTFE rubber inner ring (16). The bidirectional reciprocating elastic sealing ring (9) has a double V-shaped structure with concave V-shaped surfaces at its upper and lower ends. The steel wire (14) is fixed between the Aflas rubber outer ring (15) and the PTFE rubber inner ring (16) and is evenly distributed. The sealing structure formed by each set of bidirectional reciprocating elastic sealing rings (9) includes a set of pressure rings II (11), a bidirectional reciprocating elastic sealing ring (9), and a set of pressure caps II (12).
3. The slidable sealing tool for high-efficiency drainage drill pipe with air lift as described in claim 1, characterized in that: The polytetrafluoroethylene sealing packing (6) is installed on the groove of the insertion sealing head (3). Each set of polytetrafluoroethylene sealing packing (6) forms a sealing structure including a set of pressure ring I (5), six polytetrafluoroethylene sealing packing (6), a middle spacer ring (8), and a set of pressure cap I (7). The six polytetrafluoroethylene sealing packing (6) are arranged in groups of three, and the two groups are placed in opposite directions.
4. The slidable sealing tool for high-efficiency drainage drill pipe with air lift as described in claim 1, characterized in that: The sealing structure formed by the polytetrafluoroethylene sealing packing (6) and the sealing structure formed by the bidirectional reciprocating elastic sealing ring (9) are alternately arranged on the groove of the insertion sealing head (3), totaling five sealing sections. Among them, there are three sealing sections formed by the polytetrafluoroethylene sealing packing (6) and two sealing sections formed by the bidirectional reciprocating elastic sealing ring (9).
5. The slidable sealing tool for high-efficiency drainage drill pipe with air lift as described in claim 1, characterized in that: There is a limiting step between the oil pipe joint (1) of the insertion sealing head (3) and the first sealing section, which is the outer step (20) of the insertion sealing head. There is an inner step at the bottom of the drill pipe joint (2) of the insertion sealing cylinder (4), which is the inner step (19) of the insertion sealing cylinder. The two steps are used for subsequent limiting functions.
6. The sliding insertion sealing tool for high-efficiency air-lifted fluid drainage drill pipe as described in claim 1, wherein from top to bottom and from outside to inside, the sealing structure formed by the upper joint (2) of the drill pipe, the insertion sealing cylinder (4), the lower joint (10) of the drill pipe, the oil pipe joint (1), the insertion sealing head (3), the polytetrafluoroethylene sealing packing (6), and the sealing structure formed by the bidirectional reciprocating elastic sealing ring (9) are arranged alternately. The upper joint (2) of the drill pipe and the lower joint (10) of the drill pipe are respectively connected to the drill pipe. After the insertion sealing head (3) is connected to the oil pipe through the oil pipe joint (1), it is inserted into the insertion sealing cylinder (4) from the upper joint (2) of the drill pipe. After the outer step (20) of the insertion sealing head contacts the inner step (19) of the insertion sealing cylinder, the insertion sealing device is installed.