Special mounting tool for casing head pressure test protection ring

Abstract

The utility model provides a special mounting tool for a casing head pressure test protection ring, which comprises a mounting part sleeved on a casing head, and a plurality of connecting pieces are mounted on the mounting part; a fastening rod is rotationally arranged in the connecting piece in the radial direction of the casing head, a guide piece is rotationally connected to the end, located in the mounting part, of the fastening rod, and the inner side face of the guide piece is attached to the outer wall of the casing head; a pushing piece is rotationally arranged on the guide piece in the axial direction of the casing head, and a pressing block piece for pressing the pressure test protection ring is rotationally connected to the bottom end of the pushing piece. According to the installation tool, the stability in the installation process is ensured through cooperation of the connecting piece and the fastening rod; the guiding piece ensures that the jacking force is accurately transmitted in the axial direction of the casing head, and installation deviation is avoided; the rotating connection of the pressing block piece and the pushing piece ensures that the pressing block piece can uniformly apply force to the pressure test protection ring, the damage to the flange steel ring groove on the casing head in the process of using a hammer to knock and install is avoided, the working intensity of installation personnel is reduced, and the installation efficiency is improved.

Description

TECHNICAL FIELD

[0001] The utility model belongs to the oil and gas well engineering technical field, specifically belongs to a special installation tool of casing head pressure test protection ring. BACKGROUND

[0002] Casing head pressure test protection ring is often used as a remedial measure, and it also has the effect of enhancing sealing. In field construction, if the kava casing hanger seal fails, the pressure test protection ring is installed on the upper part of the casing hanger to achieve the purpose of remediation.

[0003] Currently, three or even four layers of casing head structure are often used in oilfield drilling operations (especially in exploration wells). In order to ensure safety, the pressure test protection ring needs to be installed in place after the casing head is installed. In order to ensure sealing, the gap between the outer diameter of the pressure test protection ring and the inner diameter of the casing head is small, so the pressure test protection ring is often forcibly installed by hammering during installation. Although the use of hammering can complete the installation of the pressure test protection ring, the installation personnel need to knock from multiple directions and slowly install through multiple hammering, which is time-consuming and labor-intensive, and the efficiency is low. At the same time, the use of hammering may also damage the flange steel ring groove on the casing head, affecting the sealing between the flanges. SUMMARY

[0004] In order to solve the problem that the pressure test protection ring is installed by hammering in the prior art, which is time-consuming and labor-intensive and may damage the flange steel ring groove on the casing head, the utility model provides a special installation tool for casing head pressure test protection ring.

[0005] To achieve the above purpose, the utility model provides the following technical scheme:

[0006] The utility model provides a special installation tool for casing head pressure test protection ring, which comprises an installation part sleeved on the casing head, and a plurality of connecting pieces are installed on the installation part;

[0007] A fastening rod is rotatably arranged in the connecting piece along the radial direction of the casing head, a guide piece is rotatably connected to the end of the fastening rod inside the installation part, and the inner side surface of the guide piece is attached to the outer wall of the casing head.

[0008] A pushing piece is rotatably arranged on the guide piece, and a pressure block piece for pressing the pressure test protection ring is rotatably connected to the bottom end of the pushing piece.

[0009] Preferably, the connecting piece comprises a first spare cap, a second spare cap, a third spare cap and a fourth spare cap, the included angle between the axes of any two adjacent ones of the first spare cap, the second spare cap, the third spare cap and the fourth spare cap is 90°, and one fastening rod is rotatably arranged on each of the first spare cap, the second spare cap, the third spare cap and the fourth spare cap.

[0010] Preferably, the fastening rods comprise a first fastening rod, a second fastening rod, a third fastening rod and a fourth fastening rod; the first fastening rod is movably connected to the first cap, the second fastening rod is movably connected to the second cap, the third fastening rod is movably connected to the third cap, and the fourth fastening rod is movably connected to the fourth cap; a guide piece is rotatably installed on each of the first fastening rod, the second fastening rod, the third fastening rod and the fourth fastening rod.

[0011] Preferably, the guide pieces comprise a first guide block, a second guide block, a third guide block and a fourth guide block; the outer end surface of the first guide block is rotatably connected to the first fastening rod, the outer end surface of the second guide block is rotatably connected to the second fastening rod, the outer end surface of the third guide block is rotatably connected to the third fastening rod, and the outer end surface of the fourth guide block is rotatably connected to the fourth fastening rod.

[0012] A connecting hole penetrating through the bottom end surface is arranged on each of the first guide block, the second guide block, the third guide block and the fourth guide block; a pushing piece is rotatably arranged in the connecting hole.

[0013] Preferably, the pushing pieces comprise a first pressure pushing rod, a second pressure pushing rod, a third pressure pushing rod and a fourth pressure pushing rod; the first pressure pushing rod is rotatably arranged in the connecting hole arranged on the first guide block; the second pressure pushing rod is rotatably arranged in the connecting hole arranged on the second guide block; the third pressure pushing rod is rotatably arranged in the connecting hole arranged on the third guide block; and the fourth pressure pushing rod is rotatably arranged in the connecting hole arranged on the fourth guide block.

[0014] The bottom end of each of the first pressure pushing rod, the second pressure pushing rod, the third pressure pushing rod and the fourth pressure pushing rod is rotatably connected to a pressing piece.

[0015] Preferably, the pressing pieces comprise a first pressing block, a second pressing block, a third pressing block and a fourth pressing block; the upper end of the first pressing block is rotatably connected to the first pressure pushing rod, the upper end of the second pressing block is rotatably connected to the second pressure pushing rod, the upper end of the third pressing block is rotatably connected to the third pressure pushing rod, and the upper end of the fourth pressing block is rotatably connected to the fourth pressure pushing rod.

[0016] The bottom end surface of each of the first pressing block, the second pressing block, the third pressing block and the fourth pressing block is attached to the upper end surface of the test tube protection ring.

[0017] Preferably, an anti-skid groove is arranged on the inner wall of the guide piece.

[0018] Preferably, the mounting part is a fixed ring.

[0019] Preferably, a mounting platform is provided on the outer arc surface of the fixing ring, a mounting hole is provided on the mounting platform, and the inner end of the mounting hole passes through the inner arc surface of the fixing ring;

[0020] The connecting piece is installed in the mounting hole on the mounting platform.

[0021] Preferably, the connecting piece is a T-shaped connecting sleeve, and the T-shaped connecting sleeve is threadedly connected to the fastening rod.

[0022] Compared with the prior art, the present invention has the following beneficial technical effects:

[0023] The utility model proposes a special installation tool for a casing head pressure test protection ring. The installation tool utilizes the cooperation of a connecting piece and a fastening rod to achieve a firm clamping of the casing head, ensuring stability during the installation process; the setting of the guide piece effectively guides the movement direction of the push piece, ensuring that the push pressure is accurately transmitted along the axial direction of the casing head, avoiding installation deviation; at the same time, the rotational connection between the pressing block piece and the push piece not only ensures that the pressing block piece can evenly apply force to the pressure test protection ring, but also reduces the friction resistance during the installation process, making the installation process smoother, avoiding damage to the flange steel ring groove on the casing head during the installation process of using a hammer, reducing the work intensity of the installer, and improving the installation efficiency.

[0024] Furthermore, the first spare cap, second spare cap, third spare cap and fourth spare cap in the installation tool are evenly distributed circumferentially, and the axial angle between two adjacent spare caps is 90°, which significantly enhances the clamping strength and stability of the installation part on the casing head. A tightening rod is screwed on each spare cap, which not only ensures the uniform distribution of the tightening force, but also makes the installation process more flexible and controllable, so that when installing the pressure test protection ring, the tightening force in each direction can be adjusted more accurately to avoid deformation or damage of the casing head due to uneven force.

[0025] Furthermore, the first fastening rod, the second fastening rod, the third fastening rod and the fourth fastening rod in the installation tool are respectively movably connected to the corresponding first spare cap, the second spare cap, the third spare cap and the fourth spare cap so that each fastening rod can independently adjust its fastening force and position, thereby more accurately adapting to casing heads of different sizes and shapes. A guide piece is rotatably installed on the inner end of each fastening rod. This design ensures that the guide piece can flexibly fit the outer wall of the casing head, and can ensure stable transmission of the thrust force even when there are slight unevenness on the surface of the casing head.

[0026] Further, the first guide block, the second guide block, the third guide block and the fourth guide block in the installation tool are rotatably connected to the inner end of the corresponding fastening rod, which greatly improves the adaptability of the installation tool to the outer wall of the casing head, and the inner end surface of each guide block can tightly fit the outer wall of the casing head, thereby ensuring the accurate transmission of the pushing force and reducing the installation error caused by uneven surface.

[0027] Further, the first pressure pushing rod, the second pressure pushing rod, the third pressure pushing rod and the fourth pressure pushing rod in the installation tool are rotatably arranged in the connecting hole on the corresponding guide block, thereby achieving the uniform pressure on the pressure protection ring, and the bottom end of each pressure pushing rod is rotatably connected with a pressing block, so that the pressing block can flexibly adapt to the slight change of the surface of the pressure protection ring while applying pressure, thereby avoiding local stress concentration and ensuring the uniformity and stability of the installation.

[0028] Further, the first pressure pushing rod, the second pressure pushing rod, the third pressure pushing rod and the fourth pressure pushing rod in the installation tool are rotatably connected to the bottom end of the corresponding pressure pushing rod, thereby ensuring that the pressure protection ring can be uniformly and stably pressed during the installation process, and the bottom end surface of each pressing block tightly fits the upper end surface of the pressure protection ring, thereby improving the efficiency of pressure transmission and reducing the error caused by indirect pressure.

[0029] Further, the anti-skid groove is arranged on the inner wall of the guide piece, thereby effectively enhancing the friction between the guide piece and the outer wall of the casing head, so that the guide piece can be more stably fitted to the casing head during the fastening process, thereby preventing the installation accuracy from being affected by sliding.

[0030] Further, the installation part improves the installation efficiency of the fixing ring and ensures the accuracy and reliability of the installation; the T-shaped connecting sleeve is used as the connecting piece and is threadedly connected with the fastening rod, thereby enhancing the stability and adjustability of the connection; and the threaded connection mode enables the fastening rod to be easily screwed in or out, thereby facilitating the installation and adjustment. BRIEF DESCRIPTION OF DRAWINGS

[0031] Figure 1 a structure diagram of the casing head pressure protection ring special installation tool;

[0032] Figure 2 a casing head pressure protection ring special installation tool;

[0033] Figure 3 a casing head pressure protection ring special installation tool;

[0034] Figure 4 a casing head pressure protection ring special installation tool;

[0035] Figure 5 The utility model provides a special installation tool for casing head pressure test protection ring;

[0036] In the drawing: 1, installation part;101, fixed ring;102, installation platform;2, connecting piece;201, first fastening rod;202, second fastening rod;203, third fastening rod;204, fourth fastening rod;3, spare cap;301, first spare cap;302, second spare cap;303, third spare cap;304, fourth spare cap;4, pressing piece;401, first pressing block;402, second pressing block;403, third pressing block;404, fourth pressing block;5, pusher;501, first pressure push rod;502, second pressure push rod;503, third pressure push rod;504, fourth pressure push rod;6, guide;601, first guide block;602, second guide block;603, third guide block;604, fourth guide block;7, casing head. DETAILED DESCRIPTION

[0037] Hereinafter, only certain exemplary embodiments are simply described. As those skilled in the art can recognize, the described embodiments can be modified in various different ways without departing from the spirit or scope of the utility model. Therefore, the drawings and the description are considered to be essentially exemplary rather than limiting.

[0038] In the description of the utility model, it needs to be understood that the orientation or positional relationship indicated by the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential" are based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the utility model and simplifying the description, and therefore cannot be understood as indicating or implying that the indicated device or element must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the utility model.

[0039] In addition, the terms "first", "second" are only for the purpose of description, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of indicated technical features. Therefore, the features defined with "first", "second" can explicitly or implicitly include one or more of the features. In the description of the utility model, the meaning of "multiple" is two or more than two, unless otherwise explicitly and specifically limited.

[0040] In the utility model, unless another definite provision and limitation, the terms "mount", "link", "connect", "fix" and so on should do broad sense understanding, for example, can be fixed connection, also can be detachable connection, or be integrated;Can be mechanical connection, also can be electric connection, still can be communication;Can be direct connection, also can be indirectly connected through intermediate medium, can be the intercommunication of two elements or the interaction of two elements.For the ordinary skilled in the art, the specific meaning of the above terms in the utility model can be understood according to specific circumstances.

[0041] In the utility model, unless another definite provision and limitation, the first feature is "on" or "under" the second feature can include that the first and second features are in direct contact, or the first and second features are not in direct contact but are in contact through another feature between them.Moreover, the first feature "on", "above" and "above" the second feature includes that the first feature is directly above and obliquely above the second feature, or only indicates that the horizontal height of the first feature is higher than that of the second feature.The first feature "under", "below" and "below" the second feature includes that the first feature is directly above and obliquely above the second feature, or only indicates that the horizontal height of the first feature is less than that of the second feature.

[0042] The embodiments of the utility model will be described in detail below with reference to the drawings.

[0043] Referring to Figures 1-5 The utility model provides a special installation tool for casing head pressure test protection ring, including installation part 1 of casing head 7, install multiple connecting pieces 3 on installation part 1;Each connecting piece 3 is rotatable along the radial direction of casing head 7 and is provided with a fastening rod 2, and the end of the fastening rod 2 inside the installation part 1 is rotatably connected with a guide piece 6, and the inner side of the guide piece 6 is attached to the outer wall of the casing head 7;The installation tool is fixed by being clamped on the outer wall of the casing head 7 by multiple guide pieces 6, so that the installation tool can stably top the pressure test protection ring;

[0044] The guide piece 6 is rotatably provided with a pushing piece 5 along the axial direction of the casing head 7, and the bottom end of the pushing piece 5 is rotatably connected with a pressure block 4 for pressure test protection ring, and the rotation of the pushing piece 5 on the guide piece 6 makes the pushing piece 5 push the pressure block 4 to move, and the pressure test protection ring installed on the casing head 7 is top pressed, and the pressure test protection ring is smoothly pressed into the casing head and the pressure test protection ring installation position.

[0045] Referring to Figures 1-5, the mounting part 1 is a fixed ring 101, four mounting platforms 102 are arranged on the outer arc surface of the fixed ring 101 at equal intervals, and one mounting hole is arranged on the outer side end surface of each mounting platform 102 along the radial direction of the fixed ring 101, and the inner side end of the mounting hole penetrates the inner arc surface of the fixed ring 101; one connecting piece 3 is arranged in each mounting hole on each mounting platform 102, and the connecting piece 3 is a T-shaped connecting sleeve which is threadedly connected with the fastening rod 2.

[0046] Referring to Figures 1-5 , the connecting piece 3 comprises a first spare cap 301, a second spare cap 302, a third spare cap 303 and a fourth spare cap 304 which are arranged circumferentially on the fixed ring 1, wherein the axis included angle between any two adjacent spare caps among the first spare cap 301, the second spare cap 302, the third spare cap 303 and the fourth spare cap 304 is 90°, and one fastening rod 2 is arranged on each of the first spare cap 301, the second spare cap 302, the third spare cap 303 and the fourth spare cap 304.

[0047] Referring to Figures 1-5 , the fastening rod 2 comprises a first fastening rod 201, a second fastening rod 202, a third fastening rod 203 and a fourth fastening rod 204, and the inner side end of each of the first fastening rod 201, the second fastening rod 202, the third fastening rod 203 and the fourth fastening rod 204 is directed towards the sleeve head; the first fastening rod 201 is movably connected with the first spare cap 301, the second fastening rod 202 is movably connected with the second spare cap 302, the third fastening rod 203 is movably connected with the third spare cap 303, and the fourth fastening rod 204 is movably connected with the fourth spare cap 304; and the inner side end of each of the first fastening rod 201, the second fastening rod 202, the third fastening rod 203 and the fourth fastening rod 204 is rotatably arranged with a guide piece 6.

[0048] Referring to Figures 1-5 , the guide piece 6 comprises a first guide block 601, a second guide block 602, a third guide block 603 and a fourth guide block 604, and the inner side end surface of each of the first guide block 601, the second guide block 602, the third guide block 603 and the fourth guide block 604 is attached to the outer wall of the sleeve head; the outer side end surface of the first guide block 601 is rotatably connected with the inner side end of the first fastening rod 201, the outer side end surface of the second guide block 602 is rotatably connected with the inner side end of the second fastening rod 202, the outer side end surface of the third guide block 603 is rotatably connected with the inner side end of the third fastening rod 203, and the outer side end surface of the fourth guide block 604 is rotatably connected with the inner side end of the fourth fastening rod 204; and the upper end of each of the first guide block 601, the second guide block 602, the third guide block 603 and the fourth guide block 604 is arranged with a connecting hole which penetrates the bottom end surface, and the pushing piece 5 is rotatably arranged in the connecting hole.

[0049] Referring to Figures 1-5, the pushing piece 5 includes a first pressure pushing rod 501, a second pressure pushing rod 502, a third pressure pushing rod 503 and a fourth pressure pushing rod 504; the first pressure pushing rod 501 is rotatably arranged in a connecting hole arranged on the first guide block 601; the second pressure pushing rod 502 is rotatably arranged in a connecting hole arranged on the second guide block 602; the third pressure pushing rod 503 is rotatably arranged in a connecting hole arranged on the third guide block 603; the fourth pressure pushing rod 504 is rotatably arranged in a connecting hole arranged on the fourth guide block 604; the bottom end of the first pressure pushing rod 501, the second pressure pushing rod 502, the third pressure pushing rod 503 and the fourth pressure pushing rod 504 are all rotatably connected with a pressing block piece 4.

[0050] Referring to Figures 1-5 , the pressing block piece 4 includes a first pressing block 401, a second pressing block 402, a third pressing block 403 and a fourth pressing block 404; the upper end of the first pressing block 401 is rotatably connected with the bottom end of the first pressure pushing rod 501, the upper end of the second pressing block 402 is rotatably connected with the bottom end of the second pressure pushing rod 502, the upper end of the third pressing block 403 is rotatably connected with the bottom end of the third pressure pushing rod 503, and the upper end of the fourth pressing block 404 is rotatably connected with the bottom end of the fourth pressure pushing rod 504; the bottom end surface of the first pressing block 401, the second pressing block 402, the third pressing block 403 and the fourth pressing block 404 is attached to the upper end surface of the test tube protection ring.

[0051] Referring to Figures 1-5 , the upper end surface of the first pressing block 401, the second pressing block 402, the third pressing block 403 and the fourth pressing block 404 is arranged with a circular connecting groove at the center position, the side wall of the circular connecting groove is arranged with an annular groove near the bottom end surface, the annular groove is concentrically arranged with the circular groove, the bottom end of the first pressure pushing rod 501, the second pressure pushing rod 502, the third pressure pushing rod 503 and the fourth pressure pushing rod 504 is arranged with an annular clamping table, the annular clamping table is rotatably connected in the annular groove, so that the pushing piece 5 and the pressing piece 4 are rotatably connected together.

[0052] Referring to Figure 1 , the inner wall of the guide piece 6 is arranged with an anti-skid groove, the friction between the guide piece 6 and the outer wall of the sleeve head 7 is increased through the anti-skid groove, and the stability of the connection between the outer wall of the sleeve head 7 and the guide piece 6 is increased.

[0053] The basic principle and main features of the present application and the advantages of the present application are shown and described above, and it is obvious for those skilled in the art that the present application is not limited to the details of the above exemplary embodiments, and the present application can be realized in other specific forms without departing from the spirit or basic features of the present application. Therefore, from any point of view, the embodiments should be regarded as exemplary and non-limiting, and the scope of the present application is defined by the appended claims rather than the above description, and therefore all changes falling within the meaning and scope of the equivalent elements of the claims are intended to be included in the present application. Any reference signs in the claims should not be considered as limiting the claims involved.

[0054] In addition, it should be understood that although the present specification is described in terms of embodiments, not every embodiment contains only one independent technical solution, and the description of the specification is only for the sake of clarity, and those skilled in the art should consider the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that those skilled in the art can understand. The above is only to illustrate the technical idea of the present application, and cannot limit the protection scope of the present application, and any modification made on the basis of the technical solutions according to the technical idea of the present application falls within the protection scope of the claims of the present application.

Claims

1. A special installation tool for a test ring of a casing head, characterized in that, The installation part (1) is sleeved on the casing head (7), and a plurality of connecting pieces (3) are installed on the installation part (1); A fastening rod (2) is rotatably arranged in the connecting piece (3) along the radial direction of the casing head (7), and a guide piece (6) is rotatably connected to the end of the fastening rod (2) inside the installation part (1), and the inner side of the guide piece (6) is attached to the outer wall of the casing head (7); A pushing piece (5) is rotatably arranged on the guide piece (6), and a pressing block (4) of the top pressing protection ring is rotatably connected to the bottom end of the pushing piece (5).

2. A special installation tool for test ring of casing head according to claim 1, characterized in that, The connecting piece (3) comprises a first cap (301), a second cap (302), a third cap (303) and a fourth cap (304), the included angle between the axes of any two adjacent caps is 90°, and one fastening rod (2) is rotatably arranged on each cap.

3. A special installation tool for test ring of a casing head according to claim 2, characterized in that, The fastening rod (2) comprises a first fastening rod (201), a second fastening rod (202), a third fastening rod (203) and a fourth fastening rod (204); the first fastening rod (201) is movably connected to the first cap (301), the second fastening rod (202) is movably connected to the second cap (302), the third cap (303) is movably connected to the third cap (303), and the fourth fastening rod (204) is movably connected to the fourth cap (304); one guide piece (6) is rotatably installed on each of the first fastening rod (201), the second fastening rod (202), the third fastening rod (203) and the fourth fastening rod (204).

4. A special installation tool for test ring of a casing head according to claim 3, characterized in that, The guide piece (6) comprises a first guide block (601), a second guide block (602), a third guide block (603) and a fourth guide block (604); the outer side end surface of the first guide block (601) is rotatably connected to the first fastening rod (201), the outer side end surface of the second guide block (602) is rotatably connected to the second fastening rod (202); the outer side end surface of the third guide block (603) is rotatably connected to the third fastening rod (203); and the outer side end surface of the fourth guide block (604) is rotatably connected to the fourth fastening rod (204). The first guide block (601), the second guide block (602), the third guide block (603) and the fourth guide block (604) are provided with a connecting hole penetrating through the bottom end surface, and the pushing piece (5) is rotatably arranged in the connecting hole.

5. A special installation tool for test ring of a casing head according to claim 4, characterized in that, The pushing piece (5) comprises a first pressure pushing rod (501), a second pressure pushing rod (502), a third pressure pushing rod (503) and a fourth pressure pushing rod (504); the first pressure pushing rod (501) is rotatably arranged in a connecting hole arranged on the first guide block (601); the second pressure pushing rod (502) is rotatably arranged in a connecting hole arranged on the second guide block (602); the third pressure pushing rod (503) is rotatably arranged in a connecting hole arranged on the third guide block (603); and the fourth pressure pushing rod (504) is rotatably arranged in a connecting hole arranged on the fourth guide block (604). Bottom ends of the first pressure pushing rod (501), the second pressure pushing rod (502), the third pressure pushing rod (503) and the fourth pressure pushing rod (504) are rotatably connected with the pressing block (4).

6. A special installation tool for test ring of a casing head according to claim 5, characterized in that, The pressing block (4) comprises a first pressing block (401), a second pressing block (402), a third pressing block (403) and a fourth pressing block (404); an upper end of the first pressing block (401) is rotatably connected with the first pressure pushing rod (501), an upper end of the second pressing block (402) is rotatably connected with the second pressure pushing rod (502), an upper end of the third pressing block (403) is rotatably connected with the third pressure pushing rod (503), and an upper end of the fourth pressing block (404) is rotatably connected with the fourth pressure pushing rod (504). Bottom end faces of the first pressing block (401), the second pressing block (402), the third pressing block (403) and the fourth pressing block (404) are attached to an upper end face of a test tube protection ring.

7. A special installation tool for test ring of a casing head according to claim 1, characterized in that, An inner wall of the guide piece (6) is provided with an anti-skid groove.

8. A special installation tool for test ring of casing head according to claim 1, characterized in that, The mounting part (1) is a fixing ring (101).

9. A special installation tool for test ring of a casing head according to claim 8, characterized in that, An outer arc face of the fixing ring (101) is provided with a mounting platform (102), the mounting platform (102) is provided with a mounting hole, and an inner end of the mounting hole penetrates an inner arc face of the fixing ring (101). The mounting platform (102) is provided with the connecting piece (3) in the mounting hole.

10. A special installation tool for test ring of a casing head according to claim 9, characterized in that, The connecting piece (3) is a T-shaped connecting sleeve, and the T-shaped connecting sleeve is threadedly connected with the fastening rod (2).

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