Well cementation detachable cement head

Abstract

The invention belongs to the technical field of well cementation equipment, and discloses a detachable well cementation cement head which comprises a cement head body. The body connecting sleeve is fixed to the bottom end of the cement head body. The top end of the connecting inner pipe penetrates through an inner cavity of the body connecting sleeve in a sleeved mode. The body bearing sleeve is fixed to the periphery of the bottom end of the connecting inner pipe, and the lower barrel is fixed below the bottom end of the connecting inner pipe. Wherein the body bearing sleeve is located below the body connecting sleeve, and the body bearing sleeve and the body connecting sleeve are fixedly connected through a bolt; the main body of the cement head is arranged to be of a split structure of the cement head body and the lower cylinder, the cement head body and the lower cylinder are connected through the body connecting sleeve, the connecting inner pipe and the body bearing sleeve, the body connecting sleeve and the body bearing sleeve are fixed through the bolts, and the sealing performance of the structure is guaranteed while the sealing performance of the structure is guaranteed; the detachable design of the cement head is achieved, and later use, disassembly, assembly and maintenance are facilitated; the device is simple in structure and convenient to disassemble, assemble and maintain, and the service life of the cement head can be effectively guaranteed.

Description

TECHNICAL FIELD

[0001] The present application belongs to the technical field of cementing equipment, and particularly relates to a cementing detachable cement head. BACKGROUND

[0002] Cementing is a construction operation of lowering casing into an oil well and injecting cement slurry into the annular space between the wellbore and the casing, which is an important environment in the drilling and completion process; in the cementing operation, the cement head is used as the wellhead device connecting the oil well casing and the cement injection vehicle, so as to complete the liquid injection isolation, cement slurry injection and release of the rubber plug and other construction processes.

[0003] At present, most of the existing cementing drilling machine cement heads are of an integral structure, which results in great difficulty in disassembling the rubber plug and consumes time and effort; in addition, since the rubber plug is placed in the interior of the integral cement head, when the rubber plug is blocked or damaged, the interior is not convenient to clean and maintain, which greatly reduces the convenience and service life. SUMMARY

[0004] In view of the technical problems in the prior art, the present application provides a cementing detachable cement head to solve the problems of the existing integral cement head, such as great difficulty in disassembling the rubber plug, inconvenience in cleaning and maintaining the interior and greatly reduced service life.

[0005] To achieve the above-mentioned purposes, the technical scheme adopted by the present application is as follows:

[0006] The present application provides a cementing detachable cement head, which comprises a cement head body, a body connecting sleeve, a connecting inner pipe, a body receiving sleeve and a lower cylinder; the body connecting sleeve is fixed at the bottom end of the cement head body, and the top end of the connecting inner pipe is sleeved in the inner cavity of the body connecting sleeve; the body receiving sleeve is fixed at the bottom end of the connecting inner pipe, and the lower cylinder is fixed below the bottom end of the connecting inner pipe; wherein the body receiving sleeve is located below the body connecting sleeve, and the body receiving sleeve and the body connecting sleeve are connected by bolt fixation.

[0007] Further, rubber plug retaining pins are arranged on both sides of the middle part of the lower cylinder.

[0008] Further, the rubber plug retaining pins are symmetrically arranged about the vertical center line of the cement head body.

[0009] Further, a rubber plug pressing port is arranged on one side wall of the middle upper part of the cement head body, and a replacement slurry port is arranged on the other side wall of the middle upper part of the cement head body; a grouting port is arranged on the outer wall of the middle lower part of the lower cylinder.

[0010] Further, the tube port parts of the rubber plug pressing port, the replacement slurry port and the grouting port are all provided with first connecting mechanisms, and the bottom end of the lower cylinder is provided with a second connecting mechanism.

[0011] Both the first connecting mechanism and the second connecting mechanism are quick-connecting mechanisms; wherein, the first connecting mechanism and the second connecting mechanism have the same structural shape, and the size of the first connecting mechanism is smaller than the size of the second connecting mechanism.

[0012] Furthermore, the quick-connect mechanism includes a connecting ring, a sealing protrusion structure, a receiving ring, and a connecting structure;

[0013] The connecting ring is fixed to the inlet of the plug, the inlet of the grouting inlet, the inlet of the grouting inlet, or the bottom end of the lower cylinder; the receiving ring is located outside the connecting ring and is fixedly connected to the connecting ring by bolts.

[0014] The connecting structure is fixed to the outside of the receiving ring, and the sealing protrusion is disposed between the connecting ring and the connecting structure; wherein, the first end of the sealing protrusion is connected to the connecting ring, and the second end of the sealing protrusion is disposed in the inner cavity of the connecting structure.

[0015] Furthermore, the second end of the sealing protrusion structure is a multi-layered stepped structure, and the inner cavity of the connecting structure is a multi-layered stepped inner cavity; wherein, the multi-layered stepped structure is configured to match the shape and size of the multi-layered stepped inner cavity.

[0016] Furthermore, a number of movable bolts are evenly arranged around the connecting ring, and a number of fixed nuts are arranged around the bottom surface of the receiving ring; wherein, one end of the movable bolt is installed through the connecting ring, and the lower end of the movable bolt passes through the receiving ring and is connected to the fixed nut.

[0017] Furthermore, it also includes a top cover; the top cover is disposed at the top of the cement head body.

[0018] Furthermore, the outer diameter of the connecting inner tube is adapted to the inner diameter of the main body connecting sleeve, and the inner diameter of the connecting inner tube is the same as the inner diameter of the lower cylinder.

[0019] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0020] This invention provides a detachable cement head for cementing. The main body of the cement head is designed as a separate structure consisting of the cement head body and the lower cylinder. The cement head body and the lower cylinder are connected by a body connecting sleeve, a connecting inner pipe, and a body receiving sleeve. The body connecting sleeve and the body receiving sleeve are fixed together with bolts. While ensuring the structural sealing performance, this design allows for the detachable cement head, facilitating subsequent use, disassembly, and maintenance. The device has a simple structure, is easy to disassemble and maintain, and thus effectively ensures the service life of the cement head.

[0021] Furthermore, the rubber plug retainer ring is symmetrically positioned about the vertical center line of the cement head body to ensure that the rubber plug retainer ring and the cementing rubber plug inside the cement head body are compatible with each other, thereby improving the stability and reliability of the structure.

[0022] Furthermore, by providing a first connecting mechanism at the pipe openings of the plugging port, the grouting port, and the injection port, and designing the first connecting mechanism and the second connecting mechanism at the bottom of the lower cylinder to have the same shape, the number of parts is effectively reduced, making it easier to disassemble and maintain the cement head.

[0023] Furthermore, the bottom end of the sealing protrusion is designed as a multi-layered stepped structure, and the inner cavity of the connecting structure is designed as a multi-layered stepped inner cavity. The shape and size of the multi-layered stepped structure and the multi-layered stepped inner cavity are matched to effectively ensure the sealing performance of the quick connection mechanism, avoid losses caused by cement slurry leakage, and ensure the reliable operation of the cementing equipment. Attached Figure Description

[0024] To more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of the present invention and should not be regarded as a limitation on the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.

[0025] Figure 1 Exploded view of the detachable cement head provided by the present invention;

[0026] Figure 2 A cross-sectional view of the detachable cement head provided by the present invention;

[0027] Figure 3 A front view of the detachable cement head provided by the present invention;

[0028] Figure 4 This is a schematic diagram of the sealing protrusion structure in this invention;

[0029] Figure 5 This is a schematic diagram of the connection structure in this invention.

[0030] The components are: 1. Cement head body, 2. Top cover, 3. Pressure plug, 4. Grouting port, 5. Body connecting sleeve, 6. Connecting inner pipe, 7. Body receiving sleeve, 8. Lower cylinder, 9. Rubber plug pin, 10. Grouting port, 11. Connecting ring, 12. Sealing protrusion structure, 13. Movable bolt, 14. Receiving ring, 15. Connecting structure, and 16. Fixing nut. Detailed Implementation

[0031] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. The components of the embodiments of this application described and shown in the accompanying drawings can generally be arranged and designed in various different configurations.

[0032] Therefore, the following detailed description of the embodiments of this application provided in the accompanying drawings is not intended to limit the scope of the claimed application, but merely to illustrate selected embodiments of the application. All other embodiments obtained by those skilled in the art based on the embodiments of this application without inventive effort are within the scope of protection of this application.

[0033] It should be noted that similar labels in the following figures indicate similar items; therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures.

[0034] In the description of the embodiments of this application, it should be noted that if terms such as "upper," "lower," "horizontal," or "inner" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship commonly used when the product of the invention is in use, they are only for the convenience of describing this application and simplifying the description, and 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 application. In addition, terms such as "first" and "second" are only used to distinguish descriptions and should not be construed as indicating or implying relative importance.

[0035] In the description of the embodiments of this application, it should also be noted that, unless otherwise explicitly specified and limited, the terms "set," "install," "connect," and "link" should be interpreted broadly; for example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal communication between two components. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.

[0036] As attached Figures 1-5 As shown, the present invention provides a detachable cement head for cementing, including a cement head body 1, a top cover 2, a plug inlet 3, a grout outlet 4, a body connecting sleeve 5, a connecting inner pipe 6, a body receiving sleeve 7, a lower cylinder 8, a rubber plug retaining ring 9, a grouting port 10, a first connecting mechanism, and a second connecting mechanism.

[0037] The cement head body 1 is provided with a cementing plug, and the top cover 2 is located at the top of the cement head body 1; wherein, the top cover 2 is fixedly connected to the top of the cement head body 1, and the cementing plug is used as a tool to separate cement slurry from mud or other fluids; the plugging port 3 is located on one side wall of the upper middle part of the cement head body 1, and the slurry displacement port 4 is located on the other side wall of the upper middle part of the cement head body 1; wherein, the plugging port 3 is used for applying pressure and releasing the cementing plug in the cement head body 1; the slurry displacement port 4 is used for injecting cement slurry or clean water into the cement head body 1 for slurry displacement.

[0038] The main body connecting sleeve 5 is fixed to the bottom end of the cement head body 1, and the top end of the connecting inner tube 6 is fitted into the inner cavity of the main body connecting sleeve 5; the bottom end of the connecting inner tube 6 is vertically downward and extends to the outside of the bottom end of the main body connecting sleeve 5; wherein, the outer diameter of the connecting inner tube 6 is adapted to the inner diameter of the main body connecting sleeve 5 to ensure the sealing between the connecting inner tube 6 and the main body connecting sleeve 5; the main body receiving sleeve 7 is fixed to the periphery of the bottom end of the connecting inner tube 6 and is used to be fixedly connected to the main body connecting sleeve 5 by bolts; specifically, the top end of the main body connecting sleeve 5 is fixedly connected to the bottom end of the cement head body 1, and the bottom end of the main body connecting sleeve 5 extends horizontally around the side away from the vertical center line of the main body connecting sleeve 5 to form an annular flange; the main body receiving sleeve 7 is located below the annular flange, and the annular flange and the main body receiving sleeve 7 are fixedly connected by bolts.

[0039] The lower cylinder 8 is fixed below the bottom end of the connecting inner tube 6; wherein, the lower cylinder 8 is coaxially arranged below the bottom end of the connecting inner tube 6, and the top end of the lower cylinder 8 is fixedly connected to the bottom end of the connecting inner tube 6; rubber plug stop pins 9 are respectively provided on both sides of the middle part of the lower cylinder 8, and the rubber plug stop pins 9 are used to control the release and downward movement of the cementing rubber plug; wherein, the rubber plug stop pins 9 are symmetrically arranged about the vertical center line of the cement head body 1, and are adapted to each other with the cementing rubber plug inside the cement head body 1 to ensure stable operation of the equipment; a grouting port 10 is provided on the lower middle outer wall of the lower cylinder 8; wherein, the grouting port is used for the injection of grouting material; the inner diameter of the lower cylinder 8 is the same as the inner diameter of the connecting inner tube 6 to ensure that the cement slurry can stably enter the lower cylinder 8.

[0040] The pipe openings of the plugging port 3, the grouting port 4, and the grouting port 10 are all provided with a first connecting mechanism, and the bottom end of the lower cylinder 8 is provided with a second connecting mechanism; the first connecting mechanism and the second connecting mechanism have the same structural shape, but the size of the first connecting mechanism is smaller than the size of the second connecting mechanism; preferably, both the first connecting mechanism and the second connecting mechanism are quick-connecting mechanisms.

[0041] The quick-connect mechanism includes a connecting ring 11, a sealing protrusion 12, a movable bolt 13, a receiving ring 14, a connecting structure 15, and a fixing nut 16; wherein, the connecting ring 11 is fixed to the pipe opening of the pressure plug 3, the pipe opening of the grouting port 4, the pipe opening of the grouting port 10, or the bottom end of the lower cylinder 8; the receiving ring 14 is located outside the connecting ring 11 and is connected to the connecting ring 11 by the movable bolt 13 and the fixing nut 16; the connecting structure 15 is fixed to the receiving ring 14. On the outer side of ring 14, the sealing protrusion structure 12 is disposed between the connecting ring 11 and the connecting structure 15; wherein, the first end of the sealing protrusion structure 12 is connected to the connecting ring 11, and the second end of the sealing protrusion structure 12 is disposed in conjunction with the inner cavity of the connecting structure 15; preferably, the second end of the sealing protrusion structure 12 is a multi-layer stepped structure, and the inner cavity of the connecting structure 15 is a multi-layer stepped inner cavity; wherein, the multi-layer stepped structure is configured to match the shape and size of the multi-layer stepped inner cavity.

[0042] In this invention, the quick-connection mechanism provided at the pipe opening of the plugging port 3, the pipe opening of the grouting port 4, and the pipe opening of the grouting port 10 is as follows:

[0043] The connecting ring 11 is fixed to the pipe opening of the pressure plug 3, the pipe opening of the grouting port 4, or the pipe opening of the grouting port 10; the receiving ring 14 is located outside the connecting ring 11 and is set away from the vertical center line of the cement head body 1; wherein, the receiving ring 14 and the connecting ring 11 are connected to the fixing nut 16 by the movable bolt 13; the connecting structure 15 is fixed outside the receiving ring 14 and is set away from the connecting ring 11; wherein, the sealing protrusion structure 12 is set between the connecting ring 11 and the connecting structure 15; specifically, the first end of the sealing protrusion structure 12 is connected to the connecting ring 11, and the second end of the sealing protrusion structure 12 is fitted into the inner cavity of the connecting structure 15; the second end of the sealing protrusion structure 12 is a multi-layer stepped structure, and the inner cavity of the connecting structure 15 is a multi-layer stepped inner cavity; wherein, the multi-layer stepped structure and the multi-layer stepped inner cavity are matched in shape and size.

[0044] In this invention, the quick-connection mechanism located at the bottom end 8 of the lower cylinder is as follows:

[0045] The connecting ring 11 is fixed to the bottom end of the lower cylinder 8, and the receiving ring 14 is located below the bottom end of the connecting ring 11; wherein, the connecting ring 11 and the receiving ring 14 are connected by bolts; specifically, a plurality of movable bolts 13 are evenly arranged around the circumference of the connecting ring 11, and each of the movable bolts 13 can be screwed in the vertical direction; a plurality of fixing nuts 16 are arranged around the bottom surface of the receiving ring 14; wherein, one end of the movable bolt 13 is installed through the connecting ring 11, and the lower end of the movable bolt 13 passes through the connecting ring 11. The receiving ring 14 is then connected to the fixing nut 16; the connecting structure 15 is fixed below the bottom end of the receiving ring 14, and the sealing protrusion 12 is disposed between the connecting ring 11 and the connecting structure 15; wherein, the top end of the sealing protrusion 12 is fixedly connected to the connecting ring 11, the bottom end of the sealing protrusion 12 is a multi-layer stepped structure, the inner cavity of the connecting structure 15 is a multi-layer stepped inner cavity, and the multi-layer stepped structure of the sealing protrusion 12 is disposed in the multi-layer stepped inner cavity of the connecting structure 15.

[0046] In this invention, the main body of the cement head is configured as a split structure of cement head body 1 and lower cylinder 8. The cement head body 1 and lower cylinder 8 are connected by body connecting sleeve 5, connecting inner tube 6 and body receiving sleeve 7. The body connecting sleeve 5 and body receiving sleeve 7 are fixed with bolts. While ensuring the sealing performance of the structure, the cement head is designed to be detachable, which is convenient for later use, disassembly and maintenance. The device has a simple structure and is easy to disassemble and maintain, thus effectively ensuring the service life of the cement head.

[0047] Working principle and usage process:

[0048] The detachable cement head of the present invention is used by first fixing the top cover 2 to the top of the cement head body 1; then, installing the lower cylinder 8 at the bottom of the cement head body 1; wherein, when installing the lower cylinder 8 at the bottom of the cement head body 1, the connecting inner pipe 6 connected to the top of the lower cylinder 8 is inserted into the inner cavity of the body connecting sleeve 5 connected to the bottom of the cement head body 1, and then the body connecting sleeve 5 is fixedly connected to the body receiving sleeve 7 with bolts; finally, according to the construction requirements, the first connecting mechanism is installed at the pipe openings of the plugging port 3, the grouting port 4, and the grouting port 10, and the second connecting mechanism is installed at the bottom of the lower cylinder 8.

[0049] In this invention, a top cover 2 is fixedly connected to the top of the cement head body 1, a plugging port 3 is fixedly connected to the upper left side of the cement head body 1, and a slurry displacement port 4 is fixedly connected to the upper right side of the cement head body 1; a body connecting sleeve 5 is fixedly connected to the bottom periphery of the cement head body 1, and a connecting inner tube 6 is set in the inner cavity of the body connecting sleeve 5; a body receiving sleeve 7 is fixedly connected to the bottom periphery of the connecting inner tube 6, and a lower cylinder 8 is fixedly connected to the bottom of the connecting inner tube 6; rubber plug stop pins 9 are installed on the left and right sides of the middle periphery of the lower cylinder 8; wherein, two rubber plug stop pins 9 are symmetrically arranged about the vertical center line of the cement head body 1, and the two rubber plug stop pins 9 are compatible with the cementing rubber plugs inside the cement head body 1 to help the equipment operate stably; a slurry injection port 10 is set in the lower left periphery of the lower cylinder 8, a first connecting mechanism is installed at the pipe openings of the plugging port 3, the slurry displacement port 4, and the slurry injection port 10, and a second connecting mechanism is installed at the bottom end of the lower cylinder 8.

[0050] In the first connection mechanism, the connecting ring 11 is fixedly connected to the pipe opening of the pressure plug 3, the grout displacement port 4, or the grout injection port 10. In the second connection mechanism, the connecting ring 11 is fixedly connected to the bottom end of the lower cylinder 8. The sealing protrusion structure 12 is fixedly connected to the bottom end of the connecting ring 11, and the movable bolt 13 is installed through-hole around the surface of the connecting ring 11. The receiving ring 14 is located at the bottom of the connecting ring 11, and the connecting structure 15 is fixedly connected to the bottom of the receiving ring 14. The inner cavity of the connecting structure 15 has a multi-layered stepped inner cavity that matches the shape and size of the sealing protrusion structure 12 to ensure the overall sealing of the equipment and avoid leakage and loss. The fixing nut 16 is fixedly connected to the bottom of the cylinder receiving ring 14 and is connected to the movable bolt 13.

[0051] It should be noted that both the first and second connecting mechanisms are quick-connect mechanisms; the first and second connecting mechanisms have the same shape, and the size of the first connecting mechanism is smaller than that of the second connecting mechanism; the quick-connect mechanism has sufficient sealing performance and does not require too many different types of parts for matching, which is convenient for later use and maintenance; there are four structures in total after the combination of the receiving ring 14, the connecting structure 15 and the fixing nut 16, namely one large size and three small sizes, which makes it more convenient to replace parts in later use and maintenance, without requiring too many different types of parts for matching; the fixing nut 16 is fixedly connected to the bottom of the receiving ring 14, and one end of the movable bolt 13 is installed through the connecting ring 11 so that the movable bolt 13 can rotate, thereby ensuring that the installation and disassembly process of the connecting structure 15 is more convenient. It can be installed and disassembled only from the top, without disassembling from the bottom of the lower cylinder 8, which effectively improves the convenience of cement head installation and disassembly and service life.

[0052] In this invention, the cement head body, lower cylinder, body connecting sleeve, and body receiving sleeve are configured as separate structures, facilitating the disassembly of the cement head body and simplifying subsequent use, assembly, and maintenance. The connection and fixation of the body connecting sleeve and body receiving sleeve ensure the cement head body and lower cylinder are assembled and fixed, improving convenience. The connecting structure has holes of the same shape and size as the sealing protrusion, and features a multi-layered stepped structure to ensure normal and stable operation of the equipment after connection, effectively guaranteeing the overall sealing of the equipment and preventing leakage and losses.

[0053] The detachable cement head of this invention has the advantages of easy disassembly and installation, and frequent cleaning. It solves the problems of most existing cement heads for cementing drilling rigs being of an integrated structure, which makes the installation of the rubber plug inconvenient, time-consuming and labor-intensive. At the same time, the rubber plug is located inside the cement head, which can cause blockage and damage in the later stages, making it difficult to clean and repair the inside, greatly reducing convenience and service life, and is not convenient to disassemble and assemble.

[0054] The above embodiments are merely one of the implementation methods for achieving the technical solution of the present invention. The scope of protection claimed by the present invention is not limited to this embodiment, but also includes any variations, substitutions and other implementation methods that can be easily conceived by those skilled in the art within the scope of the technology disclosed in the present invention.

Claims

1. A detachable cement head for well cementing, characterized in that, The system includes a cement head body (1), a body connecting sleeve (5), a connecting inner tube (6), a body receiving sleeve (7), and a lower cylinder (8). The body connecting sleeve (5) is fixed to the bottom end of the cement head body (1), and the top end of the connecting inner tube (6) is sleeved inside the inner cavity of the body connecting sleeve (5). The body receiving sleeve (7) is fixed to the outer periphery of the bottom end of the connecting inner tube (6), and the lower cylinder (8) is fixed below the bottom end of the connecting inner tube (6). The body receiving sleeve (7) is located below the body connecting sleeve (5), and the body receiving sleeve (7) and the body connecting sleeve (5) are fixedly connected by bolts.

2. The detachable cement head for well cementing according to claim 1, characterized in that, Rubber stopper pins (9) are respectively provided on both sides of the middle part of the lower cylinder (8).

3. A detachable cement head for well cementing according to claim 2, characterized in that, The rubber stopper pin (9) is symmetrically arranged about the vertical center line of the cement head body (1).

4. A detachable cement head for well cementing according to claim 1, characterized in that, A pressure plug (3) is provided on one side wall of the upper middle part of the cement head body (1), and a grout displacement port (4) is provided on the other side wall of the upper middle part of the cement head body (1); a grout injection port (10) is provided on the outer wall of the lower middle part of the lower cylinder (8).

5. A detachable cement head for well cementing according to claim 4, characterized in that, The pipe openings of the plug (3), the grouting port (4) and the grouting port (10) are all provided with a first connecting mechanism, and the bottom end of the lower cylinder (8) is provided with a second connecting mechanism. Both the first connecting mechanism and the second connecting mechanism are quick-connecting mechanisms; wherein, the first connecting mechanism and the second connecting mechanism have the same structural shape, and the size of the first connecting mechanism is smaller than the size of the second connecting mechanism.

6. A detachable cement head for well cementing according to claim 5, characterized in that, The quick-connect mechanism includes a connecting ring (11), a sealing protrusion structure (12), a receiving ring (14), and a connecting structure (15); The connecting ring (11) is fixed to the pipe opening of the plug port (3), the pipe opening of the grouting port (4), the pipe opening of the grouting port (10), or the bottom end of the lower cylinder (8); the receiving ring (14) is located outside the connecting ring (11) and is fixedly connected to the connecting ring (11) by bolts. The connecting structure (15) is fixed to the outside of the receiving ring (14), and the sealing protrusion (12) is disposed between the connecting ring (11) and the connecting structure (15); wherein, the first end of the sealing protrusion (12) is connected to the connecting ring (11), and the second end of the sealing protrusion (12) is disposed in the inner cavity of the connecting structure (15).

7. A detachable cement head for well cementing according to claim 6, characterized in that, The second end of the sealing protrusion structure (12) is a multi-layer stepped structure, and the inner cavity of the connecting structure (15) is a multi-layer stepped inner cavity; wherein the multi-layer stepped structure is matched with the shape and size of the multi-layer stepped inner cavity.

8. A detachable cement head for well cementing according to claim 6, characterized in that, The connecting ring (11) is evenly provided with a number of movable bolts (13) around its perimeter, and the receiving ring (14) is provided with a number of fixed nuts (16) around its bottom perimeter; wherein, one end of the movable bolt (13) is installed through the connecting ring (11), and the lower end of the movable bolt (13) passes through the receiving ring (14) and is connected to the fixed nut (16).

9. A detachable cement head for well cementing according to claim 1, characterized in that, It also includes a top cover (2); the top cover (2) is disposed at the top of the cement head body (1).

10. A detachable cement head for well cementing according to claim 1, characterized in that, The outer diameter of the connecting inner tube (6) is adapted to the inner diameter of the main body connecting sleeve (5), and the inner diameter of the connecting inner tube (6) is the same as the inner diameter of the lower cylinder (8).

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