Well cementation cement head with quick connection structure

Abstract

The utility model belongs to the technical field of oil field well cementation operation, and particularly relates to a well cementation cement head with a quick connection structure. The well cementation cement head comprises a cement head body, the cement head body comprises an upper body and a lower body which are connected in an inserted and screwed mode, and the inserted and screwed section of the upper body and the lower body is provided with a locking block used for stopping in the axial direction after the upper body and the lower body are screwed and a limiting block used for stopping in the circumferential direction when the upper body and the lower body are screwed in place. The well cementation cement head further comprises at least one limiting piece fixed to one of the upper body and the lower body through detachable fasteners, the other one of the upper body and the lower body is provided with rotation stopping grooves allowing the limiting pieces to stretch into and matched with the limiting pieces in the circumferential direction in a rotation stopping mode, and only one fastener corresponds to one limiting piece. And the fastening piece penetrates through the limiting piece in the radial direction and is fixedly connected with the upper body or the lower body. During assembly and disassembly, the single limiting piece can be inserted and pulled out only by disassembling and assembling one fastening piece.

Description

Technical Field

[0001] The utility model belongs to the technical field of cement heads, and in particular relates to a well cementing head with a quick connection structure. Background Art

[0002] A cement head is a device installed at the top of the casing during cementing, connecting the casing to the surface manifold. The cement head enables operations such as circulation, spacer fluid injection, cement slurry injection, plug release, and plug insertion. It serves as the central hub of the surface manifold wellhead for cementing operations.

[0003] In specific applications, to facilitate the insertion of the rubber plug and the connection between the cement head and the casing, the cement head is often designed as a split structure consisting of an upper body and a lower body. The upper and lower bodies are often connected by a threaded connection structure, such as the structure shown in the split double-plug casing cement head disclosed in Chinese utility model patent with authorization publication number CN210152605U and authorization publication date of March 17, 2020. However, due to the large size of the cement head, even if it is divided into two parts, the weight of each part is still relatively heavy. As a result, during the installation and removal process, the threaded connection structure takes a long time to operate, resulting in low work efficiency. At the same time, during frequent installation and removal operations, the threaded structure experiences friction or wear, resulting in a shortened service life.

[0004] As an improvement, Chinese utility model patent CN2547861Y, issued on April 30, 2003, discloses a clamp-type quick-connect cement head connection device, comprising a cement head body (upper body), a cement head connection sleeve (lower body), an outer clamp connected to the cement head connection sleeve, and a sleeve connection head connected to the outer clamp. The outer circumference of the cement head connection sleeve is provided with a discontinuous raised tooth block (lower locking block) that rotates in an intermittent manner with the discontinuous raised tooth block (upper locking block) on the cement head body. Raised stoppers are provided at the bottom of the discontinuous raised tooth blocks on the cement head connection sleeve and the cement head body where they rotate in an intermittent manner. During connection, the cement head body is quickly connected by rotating the cement head body relative to the cement head connection sleeve by a certain angle. However, because the stoppers only limit the rotation of the cement head body and the cement head connection sleeve in the same direction, there is a risk of the connection being disconnected if the two rotate in opposite directions.

[0005] Chinese invention patent application publication number CN1570345A, dated January 26, 2005, discloses a tool for handling and loading / unloading a quick connector or connector in a cement head assembly. The tool comprises two to five rows of load-bearing teeth (upper locking blocks / lower locking blocks) spaced apart on the inner diameter wall of the tool, corresponding to and embedded in the quick connector or connector. Corresponding half teeth (limiting blocks) are provided at the ends of the interconnections to restrict the two from rotating in opposite directions. L-shaped clamps (limiting members) are symmetrically mounted on the outer diameter wall of the tool, locking into grooves in the quick connector or connector. The L-shaped clamps securely connect the tool to the quick connector or connector, limiting rotation of the tool and the quick connector or connector in opposite directions.

[0006] The solution in CN1570345A is applied in CN2547861Y to prevent the upper and lower bodies of the cement head from rotating in opposite directions and disengaging. However, it is necessary to set a lifting ear on the outer wall of the upper or lower body in advance, and when connecting, it is necessary to assemble and fix the clamp to the lifting ear by means of bolts, nuts and pins respectively, so that the clamp is stuck in the corresponding groove of the upper or lower body. The number of parts required to be assembled for installing a single clamp (limiting member) is relatively large, which affects the efficiency of loading and unloading to a certain extent. Utility Model Content

[0007] The purpose of the utility model is to provide a cementing head with a quick connection structure to solve the problem in the prior art that the upper body and the lower body of the cement head are connected by a locking block, and the number of parts required to assemble the installation limit piece is large, which affects the assembly and disassembly efficiency.

[0008] To achieve the above objectives, the cementing head with a quick connection structure in the present invention adopts the following technical solutions:

[0009] A cementing head with a quick connection structure, the cementing head includes a cementing head body, the cementing head body includes an upper body and a lower body that are plugged and screwed together, the plug-in and screwing sections of the upper and lower bodies are respectively provided with a locking block for stopping in the axial direction after the two are screwed together, and a limit block for stopping in the circumferential direction when the two are screwed into place, the cementing head also includes at least one limit member fixed to one of the upper body and the lower body by a detachable fastener, and the other of the upper body and the lower body is provided with a rotation-stop groove for each limit member to extend into and cooperate with the limit member in the circumferential direction to stop rotation, there is only one fastener corresponding to a single limit member, and the fastener radially penetrates the limit member and is fixedly connected to the upper body or the lower body.

[0010] Furthermore, one of the upper and lower bodies that does not have a anti-rotation groove is provided with a corresponding groove for correspondingly communicating with the anti-rotation groove when the plug-in and screw-in sections of the upper and lower bodies are screwed into place. The anti-rotation groove and the corresponding groove together form a positioning groove that is adapted to the shape of the limit member.

[0011] Furthermore, the limiting member is disc-shaped, the anti-rotation groove and the corresponding groove are both semicircular grooves, and the through hole provided on the limiting member for the fastener to pass through is an eccentric hole.

[0012] Furthermore, the anti-rotation groove is a through groove arranged on the upper body, the outer peripheral surface of the lower body is stepped, the lower body includes a large diameter section with an outer diameter larger than its own plug-in screw section, and the corresponding groove is a blind groove arranged on the large diameter section.

[0013] Furthermore, the fastener is a screw.

[0014] Furthermore, the through hole provided on the limiting member for the screw to pass through is a countersunk hole.

[0015] Furthermore, the anti-rotation groove and the corresponding locking block have an overlapping portion in the axial projection of the cement head body.

[0016] Furthermore, the axial width of the limiting block is greater than the axial width of the locking block.

[0017] Furthermore, there are three or more limiting members, and the limiting members are evenly arranged along the circumferential direction of the cement head body.

[0018] Furthermore, the locking blocks are arranged in more than two rows along the circumferential direction of the cement head body and are evenly arranged along the circumferential direction.

[0019] The beneficial effects of the present invention are as follows: the present invention is improved based on the existing technology, and the upper body and the lower body are connected by rotating the plug-in screw section, which simplifies the connection process of the upper body and the lower body and improves the stability of the connection; when the upper body and the lower body are screwed into place, the locking blocks will contact each other, thereby preventing the two from disengaging in the axial direction, ensuring the stability of the connection between the upper body and the lower body; when the upper body and the lower body are rotated to the preset position, the limit blocks will conflict with each other to prevent further rotation, thereby achieving circumferential blocking and helping to prevent connection failure caused by excessive rotation; the limit member is arranged on one of the upper body and the lower body and the stop groove is matched with the stop member extending into the stop groove to stop rotation, thereby The circumferential relative positions of the upper body and the lower body are locked, thereby ensuring that the upper body and the lower body can maintain a stable connection state after being screwed together, and effectively preventing the connection from loosening due to vibration or impact during operation; a fastener is used to radially penetrate a single limit member and fixedly connect it to the upper body or the lower body to fix the limit member in the anti-rotation groove, thereby reducing the number of parts when assembling the limit member. During loading and unloading, the limit member can be inserted and removed by disassembling a single fastener, thereby realizing the rotation limit and limit release of the upper body and the lower body, thereby making the installation and disassembly operation process of the limit member simple and quick, thereby improving the installation and disassembly efficiency of the cement head and helping to shorten the operation time. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 This is a schematic structural diagram of a cement head in an embodiment of a cement head with a quick connection structure in the present utility model;

[0021] Figure 2 for Figure 1 sectional view of

[0022] Figure 3 This is a structural diagram of a limiting member in an embodiment of a cementing head with a quick connection structure in the present utility model;

[0023] Figure 4 This is a structural diagram of the upper body of an embodiment of a cementing head with a quick connection structure in the present utility model;

[0024] Figure 5 This is a structural schematic diagram of the lower body in an embodiment of a cementing head with a quick connection structure in the utility model.

[0025] In the figure: 1. Upper body; 2. Lower body; 3. Stop pin wrench; 4. Ball pitching mechanism; 5. Limiting piece; 6. Rubber plug indicator; 7. Injection union; 8. Stop pin mechanism; 9. Rubber plug; 11. Upper flow channel; 12. Second sealing ring; 13. Stop groove; 14. Upper locking block; 15. Upper limit block; 21. Lower flow channel; 22. Lower locking block; 23. Lower limit block; 24. Corresponding groove; 241. Connecting hole; 51. Through hole. DETAILED DESCRIPTION

[0026] The features and performance of the present invention are further described in detail below with reference to the embodiments.

[0027] The utility model provides a cementing head with a quick connection structure. After the upper body and the lower body are rotatably connected by the plug-in screw section, the rotation limitation and circumferential locking of the upper body and the lower body are achieved by the anti-rotation cooperation between the anti-rotation groove and the limit piece. The fixed installation and disassembly of a single limit piece is achieved by a fastener, which simplifies the assembly operation process of the limit piece, improves the assembly efficiency of the limit piece, and makes the installation and disassembly process of the cement head more efficient.

[0028] An embodiment of a cementing head with a quick connection structure in the utility model:

[0029] like Figure 1 and Figure 2 As shown, the present embodiment provides a cement head, comprising a cement head body and a flow channel arranged in the cement head body, wherein the cement head body comprises an upper body 1 and a lower body 2 connected to the upper body 1, and after the upper body 1 and the lower body 2 are connected, a flow channel extending axially is formed therein, and the flow channel comprises an upper flow channel 11 located in the upper body 1 and a lower flow channel 21 located in the lower body 2, and a valve installation cavity connecting the upper flow channel 11 and the lower flow channel 21; a pin mechanism 8 for realizing the switching of the flow state of the flow channel is installed in the valve installation cavity.

[0030] The upper part of the upper body 1 is provided with an internal thread for connecting to the drill pipe, and the interior of the upper body 1 is provided with an upper inner hole extending along its axial direction, and the upper inner hole includes a first small aperture section and a first expanded aperture section connected to the first small aperture section; the interior of the lower body 2 is provided with a lower inner hole extending through along its axial direction, and the lower inner hole includes a second small aperture section and a second expanded aperture section connected to the second small aperture section; after the upper body 1 and the lower body 2 are connected, the inner cavity of the first small aperture section forms the upper flow channel 11 of the upper body 1, the inner cavity of the second small aperture section forms the lower flow channel 21 of the lower body 2, and the first expanded aperture section and the second expanded aperture section form a valve installation cavity connecting the upper flow channel 11 and the lower flow channel 21.

[0031] To improve the efficiency of assembly and disassembly of the upper and lower bodies 1 and 2, in this embodiment, the upper and lower bodies 1 and 2 each include a plug-in and screw-in section for plugging and screwing them together. Each plug-in and screw-in section is provided with a locking block that prevents the upper and lower bodies 1 and 2 from axially disengaging after they are screwed together. During operation, a simple rotational motion can tightly connect the upper and lower bodies 1 and 2, simplifying assembly and disassembly, improving the connection stability of the upper and lower bodies 1 and 2, and also enhancing the efficiency of assembly and disassembly of the upper and lower bodies 1 and 2.

[0032] like Figure 1 and Figure 2 As shown, and reference Figure 4 and Figure 5 In this embodiment, the locking block includes a plurality of upper locking blocks 14 arranged on the inner wall circumference of the plug-in and screw-in section of the upper body 1 and evenly arranged along the axial extension direction of the upper body 1, and a plurality of lower locking blocks 22 arranged on the outer circumference of the plug-in and screw-in section of the lower body 2 and evenly arranged along the axial extension direction of the lower body 2. The lower end surface of the upper locking block 14 and the upper end surface of the lower locking block 22 are axially stopped after the upper body 1 and the lower body 2 are screwed together. After the upper body 1 and the lower body 2 are plugged in and screwed together, the locking blocks arranged circumferentially along the upper body 1 or the lower body 2 can ensure uniform force during the screwing process; the close contact between the lower end face of the upper locking block 14 and the upper end face of the lower locking block 22 forms an axial stop for the upper body 1 and the lower body 2, limiting the relative movement of the upper body 1 and the lower body 2 in the axial direction, thereby ensuring that the connection between the upper body 1 and the lower body 2 remains stable when subjected to axial force, and also helps to optimize the force distribution of the locking blocks, reduce stress concentration, and improve the reliability and durability of the connection between the upper body 1 and the lower body 2.

[0033] Specifically, the upper locking blocks 14 are arranged in four rows along the circumference of the inner wall of the upper body 1 and are evenly arranged in the circumferential direction of the upper body, and each row is evenly arranged in the axial extension direction of the upper body 1. An upper spacing groove extending along the axial direction of the upper body 1 is formed between two adjacent groups of upper locking blocks 14, so that the upper locking blocks 14 adjacent in the circumferential direction and located at the same axial position form a 90° angle; the lower locking blocks 22 are arranged in four rows corresponding to the upper locking blocks 14 along the outer circumference of the lower body 2 and are evenly arranged in the circumferential direction of the lower body, each row is evenly arranged in the axial extension direction of the upper body 1, and an upper spacing groove extending along the axial direction of the upper body 1 is formed between two adjacent groups of upper locking blocks 14. Three rows are evenly arranged along the axial extension direction of the lower body 2. Adjacent lower locking blocks 22 form lower spacing grooves extending along the axial direction of the lower body 2. Thus, circumferentially adjacent lower locking blocks 22 located at the same axial position form a 90° angle. The widths of the upper spacing grooves and lower spacing grooves are respectively equal to the widths of the locking blocks. That is, the widths of the upper locking blocks 14, lower locking blocks 22, and the upper spacing grooves and lower spacing grooves are each 1 / 8 of the circumferential length of the upper body 1 or lower body 2, thereby facilitating the passage of the locking blocks when the upper body 1 and lower body 2 are connected. In other embodiments, the upper locking blocks 14 and lower locking blocks 22 can be evenly arranged in two, three, five, or other suitable rows along the circumference. Furthermore, adjacent upper locking blocks 14 or lower locking blocks 22 located at the same axial position can form different angles. Furthermore, each row of upper locking blocks 14 or lower locking blocks 22 can be provided with two, four, or other suitable numbers along the axial direction of the cement head body. It should be understood that the number of rows of upper locking blocks 14 and lower locking blocks 22 and the number of rows provided in each row can be reasonably selected as needed and are not limited in this embodiment. Through such an arrangement, multiple stable support points can be formed in the circumferential direction of the cement head body, which helps to enhance the connection stability of the upper body 1 and the lower body 2 after abutment, ensures the uniformity of the force applied to the upper body 1 and the lower body 2, effectively prevents deformation or damage caused by excessive local force, and reduces the stress concentration phenomenon borne by a single locking block.

[0034] In order to prevent the upper body 1 and the lower body 2 from excessively rotating during the screwing process and to ensure that the upper body 1 and the lower body 2 reach the correct preset position, the upper body 1 and the lower body 2 are respectively provided with a limit block that stops the upper body 1 and the lower body 2 in the circumferential direction when the upper body 1 and the upper body 1 rotate to a certain extent to limit the rotational limit of the two. Specifically, the limit block includes an upper limit block 15 provided on the plug-in screwing section of the upper body 1 and close to the inner wall of the end of the lower body 2, and a lower limit block 23 provided on the plug-in screwing section of the lower body 2 and away from the side of the upper body 1. The circumferential end surfaces of the upper limit block 15 and the lower limit block 23 respectively constitute their stop end surfaces. In this embodiment, the upper limit block 15 and the lower limit block 23 are provided on the circumference of the cement head body corresponding to the locking block, and the circumferential width of the upper limit block 15 and the lower limit block 23 is preferably set to 1 / 2 of the width of the corresponding locking block. When the upper body 1 and the lower body 2 rotate to the preset position, the circumferential end faces of the upper limit block 15 and the lower limit block 23 conflict with each other, thereby preventing the upper body 1 and the lower body 2 from further rotating in the circumferential direction, which helps to prevent the connection failure caused by excessive rotation of the upper body 1 and the lower body 2; the combined width of the upper limit block 15 and the lower limit block 23 when stopping is the same as the width of the upper locking block 14 or the lower locking block 22, which enhances the stability of the connection between the upper body 1 and the lower body 2 and ensures the reliability of the cement head body during operation.

[0035] In this embodiment, the axial width of the limit block is greater than the axial width of the locking block. In this way, the wider axial width of the limit block can provide a larger contact area, thereby increasing the strength of the contact part and improving the safety of the overall structure.

[0036] During installation, the upper spacing groove of the upper body 1 is aligned with the lower locking block 22 of the lower body 2, or the lower spacing groove of the lower body 2 is aligned with the upper locking block 14 of the upper body 1. The lower body 2 is then inserted into the upper body 1 and rotated a certain angle so that the circumferential end surfaces of the upper limit block 15 and the lower limit block 23 are in close contact. At the same time, the upper locking block 14 and the lower locking block 22 contact each other, thereby connecting the upper body 1 and the lower body 2. In this embodiment, since the upper locking block 14, the lower locking block 22 and the spacing groove are the same width, after the lower body 2 is inserted into the upper body 1, it only needs to be rotated 45° to achieve quick installation.

[0037] In this embodiment, a locking structure is provided between the upper body 1 and the lower body 2 to maintain the upper body 1 and the lower body 2 at their rotational limit positions. Specifically, the locking structure includes at least one stopper 5 fixed to one of the upper and lower bodies by a detachable fastener. A stop groove 13 is provided on the other of the upper and lower bodies 1 and 2, into which the stopper 5 extends to circumferentially engage with the stopper 5 to prevent rotation. After the upper and lower bodies 1 and 2 are connected via the locking block, the stop groove 13 provided on one of the upper and lower bodies 1 and 2 and the stopper 5 achieve circumferential locking of the upper and lower bodies 1, thereby ensuring that the upper and lower bodies 1 and 2 maintain a stable connection after being screwed together, effectively preventing loosening of the connection due to vibration or impact during operation. At the same time, the rotation of the upper and lower bodies 1 and 2 can be limited by inserting and removing the stopper 5 and engaging the stop groove 13. The operation process is simple and quick, making the installation and removal of the cement head more efficient, helping to shorten operation time and improve overall work efficiency.

[0038] In this embodiment, only one fastener corresponds to a single stopper 5, and the fastener radially extends through the stopper 5 and is fixedly connected to the upper body 1 or the lower body 2. This reduces the number of parts required for assembling the stopper 5. When installing and removing the stopper 5, only a single fastener is required to insert and remove the stopper 5, thereby achieving rotational limit and release of the upper body 1 and the lower body 2. This makes the installation and removal of the stopper 5 simple and quick, thereby improving the efficiency of cement head installation and removal and helping to shorten operation time.

[0039] like Figures 1 to 5 As shown, in this embodiment, the limiter 5 is provided with a through-hole 51 extending radially through the cement head body, a rotation-stop groove 13 is provided on one of the upper body 1 or the lower body 2, and a connecting hole 241 extending radially is provided on the other body without the rotation-stop groove 13. The fastener passes through the through-hole 51 and is connected to the connecting hole 241 to fix the limiter 5. In this way, the limiter 5 is fixed in the rotation-stop groove 13 by the fastener. During assembly and disassembly, the limiter can be inserted and removed by only disassembling a single fastener, thereby realizing the transfer limit and release of the upper body 1 and the lower body 2, thereby improving the efficiency of the assembly and disassembly operation of the limiter 5. At the same time, the anti-rotation locking effect of the limiter 5 is improved by the fastener, thereby enhancing the stability of the connection between the upper body 1 and the lower body 2. The provision of the through-hole allows the fastener to easily pass through and fix the limiter, simplifying the overall assembly process.

[0040] In this embodiment, the connection hole 241 is a threaded hole, and the fastener is a screw (not shown) that mates with the threaded hole. The screw, acting as a fastener and mating with the threaded hole, provides a more secure locking effect for the stopper 5, making the connection between the upper body 1 and the lower body 2 more reliable and maintaining a stable connection. Furthermore, when the stopper 5 needs to be installed or removed, the screw can be removed and installed relatively quickly and easily.

[0041] In this embodiment, if Figure 5 As shown, the through hole 51 provided on the stopper 5 for the screw to pass through is a countersunk hole, which is used to fit inside the countersunk hole to fix the stopper 5. The countersunk hole structure can effectively prevent the head of the screw from protruding from the surface of the cement head, thereby avoiding possible collision or damage, and also improving the neatness of the cement head appearance; at the same time, it also helps to increase the contact area between the fastener and the stopper 5. Using a screw as a locking member in conjunction with the threaded hole can achieve a more secure locking effect for the stopper pin 5, making the connection between the upper body 1 and the lower body 2 more reliable and maintaining the stability of the connection; at the same time, when the upper body 1 and the lower body 2 need to be assembled and disassembled, the removal and installation of the fastening screw is relatively simple and quick.

[0042] like Figures 1 to 5 As shown, as a further embodiment, one of the upper body 1 and the lower body 2 that is not provided with the anti-rotation groove 13 is provided with a corresponding groove 24 for correspondingly communicating with the anti-rotation groove 13 when the plug-in screw-on sections of the upper body 1 and the lower body 2 are screwed into place, and the anti-rotation groove 13 and the corresponding groove 24 together form a positioning groove that is adapted to the shape of the limit member 5. Specifically, at least one anti-rotation groove 13 is provided on one end of either the upper body 1 and the lower body 2 that contacts each other, and a corresponding groove 24 is provided on the other and corresponds one-to-one with the anti-rotation groove 13 after the upper body 1 and the lower body 2 are rotated and abutted. The anti-rotation groove 13 and the corresponding groove 24 form a positioning groove after the upper body 1 and the lower body 2 are screwed together, and the shape of the positioning groove is adapted to the shape of the limit member 5.

[0043] Specifically, a stop groove 13 is provided at the end where the upper body 1 is connected to the lower body 2, corresponding to the upper locking block 14. The stop groove 13 extends through the hole wall of the upper body 1, that is, the stop groove 13 is a through groove. A corresponding groove 24 is provided on the lower body 2, corresponding to the lower locking block 22, at the point where it abuts the upper body 1. The outer peripheral surface of the lower body 2 is stepped, including a large diameter section with an outer diameter larger than the plug-in screw section. The corresponding groove 24 is a blind groove provided on the large diameter section. A connecting hole 241 for screw engagement is provided in the corresponding groove 24. To ensure the connection effect, the connecting hole 241 is eccentrically arranged. When the upper body 1 and the lower body 2 are connected by screwing, the stop groove 13 and the corresponding groove 24 are precisely aligned and combined into a complete positioning groove. Of course, in other embodiments, when the upper body 1 is inserted into the lower body 2, the stop groove 13 can be provided on the lower body 2, and the corresponding groove 24 can be provided on the upper body 1. Such an arrangement divides the positioning groove into a stop groove 13 and a corresponding groove 24 and respectively arranges them on the upper body 1 and the lower body 2, which helps to improve the compactness of the structure; when the limit member 5 is inserted into the complete positioning groove composed of the stop groove 13 and the corresponding groove 24, it will pass through the upper body 1 and the lower body 2 at the same time, and the two are firmly connected together through the limit member 5, which greatly enhances the stability of the connection and prevents loosening due to vibration or other reasons; at the same time, since the stop groove 13 and the corresponding groove 24 are pre-set, when in use, it is only necessary to rotate the upper body 1 and the lower body 2 to the correct position to complete the alignment and connection, without the need for additional hole alignment or adjustment operations, thereby simplifying the installation steps and improving work efficiency.

[0044] In this embodiment, the limit member 5 has a disc-shaped structure. In this way, when the limit member 5 is embedded in the positioning groove, the contact area with the positioning groove can be increased, and a uniform contact area can be provided to disperse stress, thereby improving the strength and stability of the connection; when the fastener is tightened, the limit member 5 is firmly pressed in the positioning groove, thereby effectively preventing rotation between the upper body 1 and the lower body 2.

[0045] In this embodiment, both the anti-rotation groove 13 and the corresponding groove 24 are semicircular grooves. The semicircular groove structure is easier to process and manufacture; it also helps to disperse the stress generated by the stopper 5 during the connection process, reducing stress concentration; and it facilitates the insertion of the stopper 5 into the positioning groove and enables more precise positioning.

[0046] In this embodiment, since the positioning groove is formed by two semicircular grooves, the anti-rotation groove 13 and the corresponding groove 24, in order to ensure that the fastener can be effectively connected to the upper body 1 or the lower body 2 when fixing the limit member 5, the through hole 51 opened on the limit member 5 for the fastener to pass through is an eccentric hole.

[0047] In this embodiment, there are three or more limiters 5, which are evenly arranged along the circumferential direction of the cement head body. Specifically, there are four limiters 5, and each limiter is evenly arranged along the circumferential direction of the cement head body. Multiple limiters 5 are evenly distributed along the circumferential direction, which can achieve multi-point locking, thereby enhancing the connection stability between the upper body 1 and the lower body 2, and also helps to prevent connection failure caused by excessive force on a single point; at the same time, when subjected to external force, the evenly arranged limiters 5 can evenly share the load, reduce stress concentration, and improve the durability of the connection. Of course, in other embodiments, the limiters can be set to 2 or 5. It should be understood that the setting data of the limiters needs to be reasonably set according to the connection requirements of the upper body and the lower body.

[0048] To further enhance the stability of the connection after the upper and lower bodies 1 and 2 are abutted, in this embodiment, the anti-rotation groove 13 and the corresponding locking block have overlapping projections in the axial direction of the cement head body. Specifically, the centers of the anti-rotation groove 13 and the corresponding groove 24 are located on the extension of the centerline of the corresponding locking block. This means that the circumferential arrangement of the anti-rotation groove 13 and the corresponding groove 24 on the cement head body is consistent with the circumferential arrangement of the locking blocks on the cement head body. In other words, the number of anti-rotation grooves 13 and the corresponding grooves 24 provided is consistent with the number of corresponding locking block rows. This allows for easy alignment and combination of the anti-rotation groove 13 and the corresponding groove 24 during the rotational abutment between the upper and lower bodies 1 and 2, effectively preventing connection problems caused by misalignment. Furthermore, when the stopper 5 is inserted into the positioning groove formed by the anti-rotation groove 13 and the corresponding groove 24, the center of the positioning groove coincides with the centerline of the locking block. This allows the stopper to better withstand and distribute the shear forces generated during the connection process, helping to reduce stress concentration and potential damage risks. This also simplifies the design and manufacturing of the pin hole and the locking block.

[0049] To improve the accuracy of the connection between the upper body 1 and the lower body 2, in this embodiment, each stop groove 13 and corresponding groove 24 has a first position state before the upper body 1 and the lower body 2 rotate and abut, and a second position state after the upper body 1 and the lower body 2 rotate and abut. The first position state and the second position state form a 90° angle in the circumferential direction of the cement head body. In this way, when the upper body 1 and the lower body 2 begin to rotate and prepare to abut, the stop groove 13 and the corresponding groove 24 are respectively in the first position state; as the rotation proceeds, the stop groove 13 and the corresponding groove 24 will move to the second position state, and precisely align at this position to form a complete positioning groove. Because the first position state and the second position state form a 90° angle in the circumferential direction, the stop groove 13 and the corresponding groove 24 can accurately find each other and combine during the rotation process, which can effectively prevent misalignment.

[0050] In this embodiment, the pin stop mechanism 8 includes a rotary valve, specifically, a ball valve, the rotation axis of the rotary valve is perpendicular to the central axis of the lower body 2, and the rotary valve is provided with a radial through hole for the cementing plug 9 to pass through. The aperture of the through hole is larger than the outer diameter of the plug 9, so that the plug 9 can descend smoothly during the plugging operation.

[0051] like Figure 1 And refer to Figure 2 As shown, in this embodiment, the upper body 1 is provided with an injection union 7 above the rotary valve, connected to the upper flow channel 11. Specifically, the upper body 1 is provided with an injection port connected to the flow channel, and the injection union 7 is connected to the injection port on the upper body 1 by welding. In other embodiments, the injection union 7 can be fixedly connected to the upper body 1 by threads or bolts. The injection union 7 is connected to an external cementing pipeline through the injection union 7 to enable the injection of various fluids.

[0052] like Figure 2 As shown, in this embodiment, a rotation control structure is provided at one axial end of the rotary valve. Specifically, the rotation control structure is a stop pin wrench 3, and the portion of one axial end of the rotary valve that cooperates with the stop pin wrench 3 is sleeved with a rotation-stopping structure such as a square or hexagonal structure. The external rotational torque applied by the stop pin wrench 3 can be transmitted to the rotary valve through the square or hexagonal structure. Of course, in other embodiments, the stop pin wrench can be connected to one axial end of the rotary valve by means of a thread, and accordingly, one axial end of the rotary valve has an internal thread or an external thread that is compatible with the stop pin wrench. In order to ensure the sealing of the rotational cooperation between the stop pin wrench 3 and the lower joint body, a first sealing ring (not shown in the figure) is provided on the stop pin wrench 3.

[0053] In order to accurately judge whether the rubber plug 9 falls normally, in this embodiment, a rubber plug indicator 6 is fixedly provided on the lower body 2 below the rotary valve. The structure of the rubber plug indicator 6 can be the structure disclosed in CN221346867U or other known structures.

[0054] In this embodiment, a ball throwing mechanism 4 is provided on the lower body 2 below the stop pin mechanism 8. Specifically, the ball throwing mechanism 4 is provided on the second small aperture section of the lower body 2. When a ball throwing operation is required, the ball is thrown through the ball throwing mechanism 4.

[0055] As another embodiment, the upper locking block may be arranged on the circumference of the outer periphery of the upper body, and correspondingly, the lower locking block may be arranged on the circumference of the inner wall of the lower body.

[0056] As another embodiment, the upper limit block can be set on the side of the plug-in screw section of the upper body away from the lower body, and correspondingly, the lower limit block is set on the side of the plug-in screw section of the lower body close to the upper body.

[0057] As another embodiment, the axial width of the limiting block is consistent with the axial width of the locking block, or the axial width of the limiting block is smaller than the axial width of the locking block.

[0058] As another embodiment, the projections of the anti-rotation groove, the corresponding groove and the corresponding locking block in the axial direction of the cement head body do not overlap.

[0059] As another embodiment, the groove structure of the anti-rotation groove and the corresponding groove can be one of the structures such as a square hole, a triangular hole or a hexagonal hole.

[0060] As another embodiment, the positioning groove is a complete groove and is provided on one of the upper body or the lower body; in this case, the through hole provided on the limiting member may not be an eccentric hole.

[0061] As another embodiment, the fastener may be a conical pin or a spring pin. In this case, the through hole of the limiting member is a through hole.

[0062] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. The scope of patent protection of the present invention shall be based on the claims. Any equivalent structural changes made using the description and drawings of the present invention shall also be included in the scope of protection of the present invention.

Claims

1. A cementing head with a quick-connect structure, the cementing head comprising a cementing head body, the cementing head body comprising an upper body and a lower body plugged and screwed together, the plug-in and screwing sections of the upper and lower bodies respectively provided with a locking block for axially blocking the upper and lower bodies after the upper and lower bodies are screwed together, and a limit block for circumferentially blocking the upper and lower bodies when the upper and lower bodies are screwed into place, the cementing head further comprising at least one limiter fixed to one of the upper and lower bodies by a detachable fastener, and a rotation-stop groove for each limiter to extend into and to cooperate with the limiter in the circumferential direction to prevent rotation, characterized in that: There is only one fastener corresponding to a single limiting member, and the fastener radially penetrates the limiting member and is fixedly connected to the upper body or the lower body.

2. The cementing head with a quick connection structure according to claim 1, characterized in that: One of the upper and lower bodies that does not have a anti-rotation groove is provided with a corresponding groove for corresponding communication with the anti-rotation groove when the plug-in screwing sections of the upper and lower bodies are screwed into place. The anti-rotation groove and the corresponding groove together form a positioning groove that is adapted to the shape of the limit piece.

3. The cementing head with a quick connection structure according to claim 2, characterized in that: The limiting member is in the shape of a disk, the anti-rotation groove and the corresponding groove are both semicircular grooves, and the through hole provided on the limiting member for the fastener to pass through is an eccentric hole.

4. The cementing head with a quick connection structure according to claim 2 or 3, characterized in that: The anti-rotation groove is a through groove arranged on the upper body, the outer peripheral surface of the lower body is stepped, the lower body includes a large diameter section with an outer diameter larger than its own plug-in screw section, and the corresponding groove is a blind groove arranged on the large diameter section.

5. The cementing head with a quick connection structure according to claim 1, 2 or 3, characterized in that: The fastener is a screw.

6. The cementing head with a quick connection structure according to claim 5, characterized in that: The through hole provided on the limiting component for the screw to pass through is a countersunk hole.

7. The cementing head with a quick connection structure according to claim 1, 2 or 3, characterized in that: The anti-rotation groove and the corresponding locking block have an overlapping portion in the axial direction of the cement head body.

8. The cementing head with a quick connection structure according to claim 1, 2 or 3, characterized in that: The axial width of the limiting block is greater than the axial width of the locking block.

9. The cementing head with a quick connection structure according to claim 1, 2 or 3, characterized in that: There are more than three limiting members, and each limiting member is evenly arranged along the circumferential direction of the cement head body.

10. The cementing head with a quick connection structure according to claim 1, 2 or 3, characterized in that: The locking blocks are arranged in more than two rows along the circumferential direction of the cement head body and are evenly arranged along the circumferential direction.

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