A flexible connection nipple for a formation tester

Abstract

The present invention discloses a flexible connection short section of a formation tester, which solves the technical problem that the downhole posture of the formation tester cannot be adjusted. The device includes an upper connector, an upper control body, an intermediate transfer body, a lower control body and a lower connector, which are coaxially arranged in sequence from top to bottom. The bottom end of the upper connector is connected to the upper control body, the top end of the lower connector is connected to the lower control body, and the top end of the upper connector and the bottom end of the lower connector are respectively used to connect with the corresponding short sections of the formation tester. The upper control body and the lower control body are respectively hinged to the intermediate transfer body, so that the relative positions of the upper control body, the intermediate transfer body and the lower control body can be changed to adjust the downhole posture of the formation tester. The present invention enables the downhole posture of the formation tester to be adjusted, which is beneficial for the probe to seal the well wall, thereby improving the sealing success rate.

Description

Technical Field

[0001] The invention belongs to the technical field of well logging, and in particular relates to a flexible connection nipple of a formation tester. Background Art

[0002] The development of marine oil and gas resources is the hot spot and focus of the current development of the world's marine economy. Marine oil and gas resources not only have large reserves, but modern science and technology have already possessed tremendous capabilities for their development. The marine oil and gas industry has developed into an emerging, high-value-added leading industry in the marine economy.

[0003] The formation tester is a test device that is lowered into the well via a cable. During the test, various pressure data of the test formation can be continuously recorded on the ground, and fluid samples can be taken out at the same time. By analyzing the samples, data such as fluid type, properties, and oil-gas ratio can be obtained.

[0004] The formation tester in the related art is composed of multiple short sections rigidly connected. When the formation tester is working, it needs to use its own sealing probe short section and the well wall to complete the sealing. Since the entire formation tester is in a rigid state underground, that is, the underground posture of the formation tester cannot be adjusted, it is not conducive to the formation tester probe sealing the well wall, thereby affecting the sealing success rate, which needs to be improved. Summary of the invention

[0005] In order to solve all or part of the above problems, the purpose of the present invention is to provide a flexible connection short section of a formation tester, which can adjust the downhole posture of the formation tester, facilitate the sealing of the probe on the well wall, and thus improve the sealing success rate.

[0006] The present invention provides a flexible connection short section of a formation tester, comprising an upper connecting body, an upper control body, an intermediate transfer body, a lower control body and a lower connecting body which are coaxially arranged in sequence from top to bottom, wherein the bottom end of the upper connecting body is connected to the upper control body, the top end of the lower connecting body is connected to the lower control body, and the top end of the upper connecting body and the bottom end of the lower connecting body are respectively used to connect to corresponding short sections of the formation tester, and the upper control body and the lower control body are respectively hinged to the intermediate transfer body, so that the relative positions of the upper control body, the intermediate transfer body and the lower control body can be changed to adjust the downhole posture of the formation tester;

[0007] Support blocks are respectively provided at both ends of the intermediate transfer body, and receiving blocks are respectively provided at the bottom end of the upper control body and the top end of the lower control body. Rotating shafts are respectively provided on the two receiving blocks, and the axis of the rotating shaft is perpendicular to the axis of the intermediate transfer body. Rotating grooves are respectively provided on the two support blocks, and the two rotating shafts are respectively rotatably matched with the corresponding rotating grooves.

[0008] Optionally, a sealing ring is respectively arranged between the rotating shaft and the corresponding rotating groove.

[0009] Optionally, a first washer is respectively sleeved on the two rotating shafts, a first step groove is respectively provided at the notch position of the two rotating grooves, and the first washer is tightly inserted into the corresponding first step groove.

[0010] Optionally, connecting blocks are respectively arranged between the upper connecting body and the intermediate transition body, and between the lower connecting body and the intermediate transition body, the two supporting blocks are respectively located between the corresponding receiving blocks and the connecting blocks, and one of the connecting blocks is connected to the upper control body by a fastener, and the other connecting block is connected to the lower control body by a fastener;

[0011] The two connecting blocks are respectively provided with connecting shafts at one end close to the intermediate transfer body and supporting shafts at the other end. The bottom end of the upper control body and the top end of the lower control body are respectively provided with supporting grooves. Connecting grooves are respectively provided on the two supporting blocks, and the connecting grooves are coaxial with the corresponding rotating grooves. The two supporting shafts are respectively tightly plugged in with the corresponding supporting grooves, and the two connecting shafts are respectively rotationally matched with the corresponding connecting grooves.

[0012] Optionally, the connecting block and the receiving block are respectively provided with a rotating arc surface at one end facing the intermediate adapter body, the two support blocks are respectively provided with an arc chamfer at one end away from the intermediate adapter body, and the rotation angle of the upper control body and the lower control body relative to the intermediate adapter body is ≤10°.

[0013] Optionally, a positioning step groove is respectively provided at the bottom end of the upper connecting body and the top end of the lower connecting body, the two supporting grooves are respectively located at the bottom of the corresponding positioning step grooves, and the ends of the two connecting blocks away from the intermediate transfer body are respectively tightly abutted against the inner side walls of the corresponding positioning step grooves.

[0014] Optionally, the upper control body, the intermediate adapter body and the lower control body have the same outer diameters, and the outer side walls of the connecting block and the receiving block are respectively arc-shaped and flush with the outer side wall of the intermediate adapter body.

[0015] Optionally, a second gasket is respectively sleeved on the two connecting shafts, a second step groove is respectively provided at the port position of the two connecting grooves, and the second gasket is tightly inserted into the corresponding second step groove.

[0016] Optionally, a plurality of sealing ring grooves are respectively provided on the side walls of each of the connecting shaft and the supporting shaft, and the plurality of sealing ring grooves are arranged at equal intervals along the axial direction of the corresponding connecting shaft or the supporting shaft.

[0017] Optionally, the upper connector includes an upper joint and an upper protective cap, the bottom end of the upper joint is connected to the upper control body via a first quick-screw nut, the upper protective cap is movably sleeved on the top end of the upper joint, and connected to the upper joint via a second quick-screw nut.

[0018] Optionally, the lower connecting body includes a lower joint and a lower protective cap, the top end of the lower joint is connected to the lower control body via a third quick-screw nut, and the lower protective cap is inserted into the bottom end of the lower joint and threadedly connected to the lower joint.

[0019] It can be seen from the above technical solution that the flexible connection nipple of the formation tester provided by the present invention has the following advantages:

[0020] The upper control body and the lower control body in the flexible connection short section are respectively hinged with the intermediate adapter body to allow the formation tester to rotate in the direction of the probe, so that the downhole posture of the formation tester can be adjusted, which is conducive to the probe sealing the well wall, thereby improving the sealing success rate. At the same time, since the downhole posture of the formation tester can be adjusted, the risk of the formation tester encountering obstruction or jamming is effectively reduced, thereby improving the use stability of the formation tester.

[0021] Other features and advantages of the present invention will be set forth in the description which follows. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] The accompanying drawings are used to provide a further understanding of the technical solution of the present invention and constitute a part of the specification. Together with the embodiments of the present invention, they are used to explain the technical solution of the present invention and do not constitute a limitation on the technical solution of the present invention.

[0023] Figure 1 It is a schematic diagram of the overall structure of an embodiment of the present invention;

[0024] Figure 2 It is a structural schematic diagram of an embodiment of the present invention;

[0025] Figure 3 is a cross-sectional view of an embodiment of the present invention;

[0026] Figure 4 This is a structural view of the intermediate adapter in an embodiment of the present invention;

[0027] Figure 5 It is a structural schematic diagram of an upper control body in an embodiment of the present invention;

[0028] Figure 6 It is a structural schematic diagram of the lower control body in an embodiment of the present invention;

[0029] Figure 7 This is a schematic diagram of the structure of a connection block in an embodiment of the present invention;

[0030] Figure 8 It is a side view of the intermediate adapter body in the embodiment of the present invention;

[0031] Fig. 9 This is a side view of the upper control body in an embodiment of the present invention;

[0032] Fig.10 is a side view of the lower control body in an embodiment of the present invention;

[0033] Fig.11 It is a side view of the connecting block in the embodiment of the present invention.

[0034] Description of reference numerals:

[0035] 1. Upper connector; 101. Upper joint; 102. Upper protective cap; 103. First quick-turn nut; 104. Second quick-turn nut; 2. Upper control body; 3. Intermediate adapter; 4. Lower control body; 5. Lower connector; 501. Lower joint; 502. Lower protective cap; 503. Third quick-turn nut; 6. Support block; 7. Receiving block; 8. Rotating shaft; 9. Rotating groove; 10. Connecting block; 11. Fastener; 12. Connecting shaft; 13. Support shaft; 14. Support groove; 15. Connecting groove; 16. Rotating arc surface; 17. Circular arc chamfer; 18. Positioning step groove; 19. First gasket; 20. First step groove; 21. Second gasket; 22. Second step groove; 23. Sealing ring; 24. Annular groove; 25. Sealing ring groove. DETAILED DESCRIPTION

[0036] To make the purpose, technical solution and advantages of the present invention more clear, the embodiments of the present invention will be described in detail with reference to the accompanying drawings. It should be noted that the embodiments and features in the embodiments of the present invention can be combined with each other arbitrarily without conflict.

[0037] like Figure 1-Figure 11 An embodiment of the present invention is shown, in which a flexible connecting short section of a formation tester is disclosed, including an upper connecting body 1, an upper control body 2, an intermediate transition body 3, a lower control body 4 and a lower connecting body 5 arranged in sequence from top to bottom, the upper connecting body 1, the upper control body 2, the intermediate transition body 3, the lower control body 4 and the lower connecting body 5 are respectively cylindrical, and the upper connecting body 1, the upper control body 2, the intermediate transition body 3, the lower control body 4 and the lower connecting body 5 are coaxial.

[0038] In one embodiment, Figure 1 , Figure 2 , Figure 3As shown, the bottom end of the upper connecting body 1 is connected to the upper control body 2, the top end of the lower connecting body 5 is connected to the lower control body 4, and the top end of the upper connecting body 1 and the bottom end of the lower connecting body 5 are respectively used to connect with the corresponding short sections of the formation tester. The upper control body 2 and the lower control body 4 are respectively hinged to the intermediate transition body 3, so that the relative positions of the upper control body 2, the intermediate transition body 3 and the lower control body 4 can be changed to adjust the downhole posture of the formation tester.

[0039] The flexible connection nipple of the formation tester in this embodiment, because the upper control body 2 and the lower control body 4 are respectively hinged with the intermediate adapter body 3, the formation tester can rotate in the direction of the probe, so that the downhole posture of the formation tester can be adjusted, which is conducive to the setting of the probe on the well wall, thereby improving the success rate of setting. At the same time, because the downhole posture of the formation tester can be adjusted, the risk of the formation tester encountering obstruction or jamming is effectively reduced, thereby improving the use stability of the formation tester.

[0040] In one embodiment, Figure 3 , Figure 4 , Figure 5 , Figure 6 As shown, the middle positions of both ends of the intermediate transfer body 3 are respectively integrally connected with support blocks 6, and the bottom end of the upper control body 2 and the top end of the lower control body 4 are respectively integrally connected with receiving blocks 7. The two receiving blocks 7 are respectively integrally connected with rotating shafts 8, and the axes of the two rotating shafts 8 are parallel, and the axes of the two rotating shafts 8 are respectively perpendicular to the axis of the intermediate transfer body 3. At the same time, the side walls of the two support blocks 6 are respectively provided with rotating grooves 9, and the two rotating shafts 8 are respectively tightly inserted in the corresponding rotating grooves 9 and rotate with the corresponding rotating grooves 9.

[0041] In one embodiment, Figure 1 , Figure 2 As shown, connecting blocks 10 are respectively arranged between the upper connecting body 1 and the intermediate transfer body 3, and between the lower connecting body 5 and the intermediate transfer body 3, and the two supporting blocks 6 are respectively located between the corresponding receiving blocks 7 and the connecting blocks 10. At the same time, one of the connecting blocks 10 is connected to the upper control body 2 by a fastener 11, and the other connecting block 10 is connected to the lower control body 4 by a fastener 11.

[0042] In one embodiment, Figure 4 , Figure 5 , Figure 6 , Figure 7As shown, the two connecting blocks 10 are integrally connected with a connecting shaft 12 at one end close to the intermediate transfer body 3, and are integrally connected with a supporting shaft 13 at the other end. The bottom end of the upper control body 2 and the top end of the lower control body 4 are respectively provided with a supporting groove 14, and the two supporting blocks 6 are respectively provided with a connecting groove 15, and the connecting groove 15 is coaxial with the corresponding rotating groove 9. At the same time, the two supporting shafts 13 are respectively tightly plugged with the corresponding supporting grooves 14, and the two connecting shafts 12 are respectively rotationally matched with the corresponding connecting grooves 15.

[0043] In one embodiment, Figure 1 , Figure 4 , Figure 5 , Figure 6 , Figure 7 As shown, the ends of the connecting block 10 and the receiving block 7 facing the intermediate transfer body 3 are respectively provided with a rotating arc surface 16, and the ends of the two support blocks 6 away from the intermediate transfer body 3 are respectively provided with an arc chamfer 17, so as to shorten the distance between the upper control body 2 and the lower control body 4 and the intermediate transfer body 3 as much as possible, and shorten the length of the flexible connection short section as much as possible. In addition, the rotating arc surface 16 and the arc chamfer 17 can also ensure that the upper control body 2 and the lower control body 4 rotate smoothly relative to the intermediate transfer body 3, reducing the risk of getting stuck.

[0044] In this embodiment, the rotation angle of the upper control body 2 and the lower control body 4 relative to the intermediate adapter body 3 is ≤10° to ensure the stability of the formation tester, avoid excessive deformation of the formation tester, and ensure the overall rigidity of the formation tester so that the formation tester can pass through the oil well smoothly.

[0045] In one embodiment, Figure 5 , Figure 6 As shown, the bottom end of the upper connector 1 and the top end of the lower connector 5 are respectively provided with positioning step grooves 18, and the two supporting grooves 14 are respectively located at the bottom of the corresponding positioning step grooves 18. The ends of the two connecting blocks 10 away from the intermediate adapter body 3 are flat and are respectively tightly abutted against the inner side walls of the corresponding positioning step grooves 18 to achieve the limitation of the installation position of the connecting block 10, and also to improve the limiting effect between the connecting block 10 and the upper control body 2 or the lower control body 4.

[0046] In this embodiment, the fasteners 11 are fastening bolts, that is, the connecting block 10 is connected to the upper control body 2 and the lower control body 4 respectively by four fastening bolts. Of course, in other embodiments, other fastening structures can also be used, which are not listed in detail here.

[0047] In one embodiment, Figure 1 , Figure 3As shown, the outer diameters of the upper control body 2, the intermediate transition body 3 and the lower control body 4 are the same. At the same time, the outer walls of the connecting block 10 and the receiving block 7 are respectively arc-shaped and flush with the outer wall of the intermediate transition body 3, that is, the outer diameter of the entire flexible short-circuit is similar, and the outer diameter of the flexible connecting short section is reduced as much as possible to adapt to oil wells with smaller inner diameters.

[0048] In one embodiment, Figure 8 , Fig. 9 , Fig.10 , Fig.11 As shown, the two rotating shafts 8 are respectively sleeved with first washers 19, the notch positions of the two rotating grooves 9 are respectively provided with first step grooves 20, and the first washers 19 are tightly snapped into the corresponding first step grooves 20. The two connecting shafts 12 are respectively sleeved with second washers 21, the port positions of the two connecting grooves 15 are respectively provided with second step grooves 22, and the second washers 21 are tightly snapped into the corresponding second step grooves 22. In this embodiment, the material of the washers is selected from wear-resistant materials and heat-treated, which can reduce the friction between the two connecting parts and better realize the rotation function.

[0049] In this embodiment, the upper control body 2, the intermediate adapter body 3 and the lower control body 4 have pressure oil pipelines, return oil pipelines, line pipelines and sample pipelines inside, the connecting block 10 has pressure oil pipelines and sample pipelines inside, and the pressure oil pipelines and sample pipelines inside the connecting block 10 are connected to the pressure oil pipelines and sample pipelines in the upper control body 2, the intermediate adapter body 3 and the lower control body 4.

[0050] An integrated valve seat is provided inside the upper control body 2, and a hydraulic fluid control valve seat and an electromagnetic integrated valve seat are provided inside the lower control body 4. The opening and closing of the hydraulic fluid control valve are controlled by the electromagnetic integrated valve, and the on and off of the fluid pipeline are controlled to realize the exchange operation of different probes. Of course, in other embodiments, the length of the upper control body 2 or the lower control body 4 can be increased according to the use requirements, and a solenoid valve, a hydraulic control valve, etc. can be added inside the upper control body 2 or the lower control body 4 according to the functional requirements of the entire instrument.

[0051] In one embodiment, Figure 8 , Fig. 9 , Fig.10 As shown, a sealing ring 23 is respectively provided between the rotating shaft 8 and the corresponding rotating groove 9, that is, an annular groove 24 is provided on the rotating shaft 8, and the sealing ring 23 is embedded in the annular groove 24. When the rotating shaft 8 is inserted into the rotating groove 9, the sealing ring 23 is tightly abutted against the inner wall of the rotating groove 9 to achieve sealing.

[0052] In one embodiment, Figure 7 , Fig.11As shown, the side walls of each connecting shaft 12 and the supporting shaft 13 are respectively provided with a plurality of sealing ring grooves 25, and the plurality of sealing ring grooves 25 are arranged at equal intervals along the axial direction of the corresponding connecting shaft 12 or the supporting shaft 13. When the connecting shaft 12 is inserted into the connecting groove 15, a labyrinth seal is formed between the sealing ring groove 25 on the connecting shaft 12 and the inner side wall of the connecting groove 15. Similarly, when the supporting shaft 13 enters the supporting groove 14, a labyrinth seal is formed between the sealing ring groove 25 on the supporting shaft 13 and the inner side wall of the supporting groove 14.

[0053] In one embodiment, Figure 1 , Figure 3 As shown, the upper connector 1 includes an upper joint 101 and an upper protective cap 102. The bottom end of the upper joint 101 is connected to the upper control body 2 via a first quick-screw nut 103. The upper protective cap 102 is movably sleeved on the top of the upper joint 101 and is connected to the upper joint 101 via a second quick-screw nut 104. The upper protective cap 102 can protect the upper joint 101 and reduce the risk of bumping or damage to the upper joint 101.

[0054] In one embodiment, Figure 1 , Figure 3 As shown, the lower connector 5 includes a lower joint 501 and a lower protective cap 502. The top of the lower joint 501 is connected to the lower control body 4 via a third quick-screw nut 503. The lower protective cap 502 is inserted into the bottom of the lower joint 501 and is threadedly connected to the lower joint 501. The lower protective cap 502 can protect the lower joint 501 and reduce the risk of bumping or damage to the lower joint 501.

[0055] From the above process, it can be seen that the formation tester adopts this flexible connection short section, which can ensure the safety of downhole operation of the instrument and meet the requirements of fluid and electrical connection of the instrument. By rotating the instrument, the attitude of the instrument can be adjusted to ensure that the probe and the well wall are smoothly sealed, thereby improving the success rate of the operation. At the same time, the downhole attitude of the formation tester can be adjusted to reduce the risk of the formation tester encountering obstruction or jamming, and ensure the safety of downhole operation of the instrument.

[0056] It should be noted that, unless otherwise specified, the technical terms or scientific terms used in the present invention should have the common meanings understood by those skilled in the art to which the present invention belongs.

[0057] In addition, the terms "first", "second", etc. are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. In the description of the present invention, the meaning of "plurality" is more than two, unless otherwise clearly and specifically defined.

[0058] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit them; although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or replace some or all of the technical features therein by equivalents; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the present invention, and they should all be included in the scope of the claims and specification of the present invention. In particular, as long as there is no structural conflict, the various technical features mentioned in each embodiment can be combined in any way. The present invention is not limited to the specific embodiments disclosed herein, but includes all technical solutions that fall within the scope of the claims.

Claims

1. A flexible connection nipple of a formation tester, characterized in that: The invention comprises an upper connecting body (1), an upper control body (2), an intermediate transfer body (3), a lower control body (4) and a lower connecting body (5) which are coaxially arranged in sequence from top to bottom, wherein the bottom end of the upper connecting body (1) is connected to the upper control body (2), the top end of the lower connecting body (5) is connected to the lower control body (4), and the top end of the upper connecting body (1) and the bottom end of the lower connecting body (5) are respectively used to be connected to the corresponding short section of the formation tester, and the upper control body (2) and the lower control body (4) are respectively hinged to the intermediate transfer body (3) so that the relative positions of the upper control body (2), the intermediate transfer body (3) and the lower control body (4) can be changed to adjust the downhole posture of the formation tester; Support blocks (6) are respectively provided at both ends of the intermediate transfer body (3); receiving blocks (7) are respectively provided at the bottom end of the upper control body (2) and the top end of the lower control body (4); rotating shafts (8) are respectively provided on the two receiving blocks (7); and the axis of the rotating shaft (8) is perpendicular to the axis of the intermediate transfer body (3); rotating grooves (9) are respectively provided on the two support blocks (6); and the two rotating shafts (8) are respectively rotatably matched with the corresponding rotating grooves (9); A connecting block (10) is provided between the upper connecting body (1) and the intermediate transition body (3), and between the lower connecting body (5) and the intermediate transition body (3), respectively; the two supporting blocks (6) are respectively located between the corresponding receiving blocks (7) and the connecting blocks (10), and one of the connecting blocks (10) is connected to the upper control body (2) via a fastener (11), and the other connecting block (10) is connected to the lower control body (4) via a fastener (11); The two connecting blocks (10) are respectively provided with connecting shafts (12) at one end close to the intermediate transfer body (3) and supporting shafts (13) at the other end; the bottom end of the upper control body (2) and the top end of the lower control body (4) are respectively provided with supporting grooves (14); the two supporting blocks (6) are respectively provided with connecting grooves (15), and the connecting grooves (15) are coaxial with the corresponding rotating grooves (9); the two supporting shafts (13) are respectively tightly plugged in with the corresponding supporting grooves (14); and the two connecting shafts (12) are respectively rotationally matched with the corresponding connecting grooves (15); The connecting block (10) and the receiving block (7) are respectively provided with a rotational arc surface (16) at one end facing the intermediate transition body (3), and the two supporting blocks (6) are respectively provided with an arc chamfer (17) at one end away from the intermediate transition body (3), and the rotation angle of the upper control body (2) and the lower control body (4) relative to the intermediate transition body (3) is ≤10°.

2. The flexible connecting nipple according to claim 1, characterized in that: A sealing ring (23) is respectively provided between the rotating shaft (8) and the corresponding rotating groove (9).

3. The flexible connecting nipple according to claim 1, characterized in that: The two rotating shafts (8) are respectively sleeved with first washers (19), the notch positions of the two rotating grooves (9) are respectively provided with first step grooves (20), and the first washers (19) are tightly inserted into the corresponding first step grooves (20).

4. The flexible connecting nipple according to claim 1, characterized in that: The bottom end of the upper connecting body (1) and the top end of the lower connecting body (5) are respectively provided with positioning step grooves (18), the two supporting grooves (14) are respectively located at the bottom of the corresponding positioning step grooves (18), and the ends of the two connecting blocks (10) away from the intermediate transition body (3) are respectively tightly abutted against the inner side walls of the corresponding positioning step grooves (18).

5. The flexible connecting nipple according to claim 4, characterized in that: The outer diameters of the upper control body (2), the intermediate adapter body (3) and the lower control body (4) are the same, and the outer side walls of the connecting block (10) and the receiving block (7) are respectively arc-shaped and flush with the outer side wall of the intermediate adapter body (3).

6. The flexible connecting nipple according to claim 1, characterized in that: The two connecting shafts (12) are respectively sleeved with second washers (21), the port positions of the two connecting grooves (15) are respectively provided with second step grooves (22), and the second washers (21) are tightly inserted into the corresponding second step grooves (22).

7. The flexible connecting nipple according to claim 1, characterized in that: The side walls of each of the connecting shafts (12) and the supporting shafts (13) are respectively provided with a plurality of sealing ring grooves (25), and the plurality of sealing ring grooves (25) are arranged at equal intervals along the axial direction of the corresponding connecting shaft (12) or the supporting shaft (13).

8. The flexible connecting nipple according to claim 1, characterized in that: The upper connecting body (1) comprises an upper joint (101) and an upper protective cap (102); the bottom end of the upper joint (101) is connected to the upper control body (2) via a first quick-turn nut (103); the upper protective cap (102) is movably sleeved on the top end of the upper joint (101) and connected to the upper joint (101) via a second quick-turn nut (104).

9. The flexible connecting nipple according to claim 1, characterized in that: The lower connecting body (5) comprises a lower joint (501) and a lower protective cap (502); the top end of the lower joint (501) is connected to the lower control body (4) via a third quick-screw nut (503); the lower protective cap (502) is inserted into the bottom end of the lower joint (501) and is threadedly connected to the lower joint (501).

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