Cement head

Abstract

The utility model belongs to the technical field of oil field well cementation operation, and particularly relates to a cement head. The cement head comprises a cement head body and a rotary valve, a first valve seat and a second valve seat which are oppositely arranged are arranged in the cement head body, the rotary valve is rotationally installed on the first valve seat and the second valve seat through rotary shafts at the two ends, and the cement head body comprises an upper body and a lower body. A positioning structure for directly or indirectly positioning the first valve seat and the second valve seat in the vertical direction is arranged on the upper body and the lower body, a penetrating hole is formed in the side wall of the upper body or the lower body, and a rotating wrench is installed in the penetrating hole in a sealed mode. A rotation stopping structure is arranged on the rotating shaft at one end of the rotating valve, an exposing structure capable of exposing the rotation stopping structure is arranged on the first valve seat or the second valve seat where the rotating shaft at the end is located, and one end of the rotating wrench is matched with the rotation stopping structure in a rotation stopping mode. Through the structural arrangement, a sealing structure between the rotary valve and the cement head body is reduced, and the leakage risk caused by sealing in the operation process is reduced.

Description

TECHNICAL FIELD

[0001] The utility model belongs to the technical field of oilfield cementing operation, and particularly relates to a cement head. BACKGROUND

[0002] The cement head is a cementing device installed at the top end of a casing during cementing, and connected with a casing and a surface manifold. The cement head can complete circulation, injection of an isolation fluid, injection of a cement slurry, release of a rubber plug, plug injection and other operations, and is a total hub of a surface manifold wellhead in cementing operations.

[0003] For example, a kind of circulating manifold built-in rotary cement head is disclosed in Chinese patent application with application publication number CN117231157A and application publication date December 15, 2023, which includes a cement head body, a lifting nipple is arranged at the top of the cement head body, a lower outer cylinder is sealingly connected to the bottom of the cement head body, and the lower outer cylinder can rotate relative to the cement head body;A main flow channel and a secondary flow channel are arranged axially in the cement head body, a lower cylinder flow channel is arranged axially through the lower outer cylinder, a rotary valve is arranged at the bottom of the main flow channel and the secondary flow channel, and the rotary valve can rotate to connect the main flow channel or the secondary flow channel with the lower cylinder flow channel;First and second mounting through holes are arranged on the side wall of the cement head body, a side cover is sealingly connected in the first mounting through hole, a third mounting through hole is arranged through the side cover, an axial end of the rotary valve is rotatably installed in the third mounting through hole, and the other axial end of the rotary valve is rotatably installed in the second mounting through hole;A first bearing is arranged between the rotary valve and the side cover, and a second bearing is arranged between the rotary valve and the inner wall of the cement head body;A first sealing ring is arranged between the rotary valve shaft and the side cover, a second sealing ring is arranged between the rotary valve shaft and the second mounting through hole, and a third sealing ring is arranged between the side cover and the first mounting through hole.

[0004] In the above-mentioned scheme, when assembling the rotary valve, two mounting through holes are correspondingly arranged on the side wall of the cement head body, the second bearing and the second sealing ring are assembled on one end of the rotary valve shaft first, then the first bearing and the first sealing ring are assembled on the other end of the rotary valve shaft, then the assembled rotary valve is sent into the flow channel in the cement head body through the first mounting through hole, and one end of the rotary valve shaft is assembled into the second mounting through hole, finally the third sealing ring is assembled on the side cover to cover the first mounting through hole, and the side cover is sleeved on the axial end of the rotary valve. It can be seen that multiple sealing rings are designed in the above-mentioned scheme to improve the sealing between the rotary valve and the cement head body, but the existence of multiple sealing points increases the risk of leakage during operation. UTILITY MODEL CONTENTS

[0005] The utility model aims to provide a cement head to solve the problem of multiple sealing structures between the rotary valve and the cement head body in the prior art, which leads to the risk of leakage during operation.

[0006] To achieve the above object, the cement head adopts the following technical scheme in the utility model:

[0007] A cement head, comprising a cement head body and a rotary valve, the cement head body is internally provided with oppositely arranged first and second valve seats, the rotary valve is rotatably installed on the first and second valve seats through rotating shafts at two ends, the cement head body comprises an upper body and a lower body, the upper and lower bodies are provided with positioning structures for directly or indirectly positioning the first and second valve seats in the up-down direction, a through hole is formed in the side wall of the upper body or the lower body, a rotary wrench is sealingly installed in the through hole, a rotation stopping structure is arranged on the rotating shaft at one end of the rotary valve, and a revealing structure capable of revealing the rotation stopping structure is arranged on the first valve seat or the second valve seat where the end rotating shaft is located, and one end of the rotary wrench is in rotation stopping cooperation with the rotation stopping structure.

[0008] Further, the rotating shafts at two ends of the rotary valve are rotatably installed on the first and second valve seats through bearings, and the first and second valve seats are respectively provided with mounting holes for mounting the bearings.

[0009] Further, the first and second valve seats are respectively provided with grease injection holes in communication with the corresponding mounting holes, and the grease injection holes are used for injecting grease into the mounting holes.

[0010] Further, the mounting holes are provided with ring grooves around, the ring grooves divide the grease injection holes into first and second grease injection holes, the two end faces of the rotary valve are respectively provided with convex rings, each convex ring is inserted into the corresponding ring groove, and each convex ring is provided with a grease passing structure, and the grease passing structure has a communication state in communication with the first and second grease injection holes during rotation of the rotary valve.

[0011] Further, the two end faces of the rotary valve are flat end faces, the first and second valve seats are respectively provided with abutting faces in contact with the flat end faces, and the mounting holes are arranged on the abutting faces.

[0012] Further, a support pipe for supporting the rotary valve is arranged below the rotary valve, the upper end of the support pipe is fixedly connected with the lower ends of the first and second valve seats, and the lower end of the support pipe abuts on the lower body.

[0013] Further, a positioning pipe for accommodating a cementing rubber plug is arranged above the rotary valve, the lower end of the positioning pipe is fixedly connected with the upper ends of the first and second valve seats, and the upper end of the positioning pipe abuts on the upper body.

[0014] Further, the rotary valve has a spherical surface structure, the upper end of the support pipe and the lower end of the positioning pipe both have a spherical surface structure matched with the rotary valve.

[0015] Further, the rotating valve is provided with a through hole for the cement plug to pass through in a radial direction, and a groove is arranged at the position of the hole opening of at least one end of the through hole and penetrates the rotating valve along a direction perpendicular to the axis of the through hole and the rotating axis of the rotating valve, and the groove is used to jointly form a channel with the inner wall of the cement head body for the cement slurry to pass through.

[0016] Further, the rotation-stopping structure on the rotating shaft is a square column or a hexagonal column, and one end of the rotating wrench is provided with a groove, and the square column or the hexagonal column is located in the groove, and the groove comprises two parallel groove side walls and a groove bottom wall, and the two groove side walls are in rotation-stopping cooperation with the parallel side surfaces of the square column or the hexagonal column.

[0017] The cement head body is composed of an upper body and a lower body in a split structure, so that the components installed in the cement head body can be conveniently installed, maintained and replaced; the first valve seat and the second valve seat arranged in the cement head body jointly provide a stable installation environment for the rotating valve, and the two ends of the rotating valve are rotatably installed on the valve seats, so that the stability and reliability of the rotating valve in the working process are ensured; the positioning structure arranged on the upper body and the lower body in the up-down direction positions the first valve seat and the second valve seat, so that the installation accuracy of the first valve seat and the second valve seat is ensured, the stability of the rotating valve installation is further ensured, the loosening or position deviation of the rotating valve or the valve seat caused by vibration or external force is avoided, and the working reliability of the rotating valve is improved; the rotating wrench is sealingly installed in the through hole of the cement head body, so that the cement slurry or other impurities can be effectively prevented from entering the flow channel of the rotating valve; the rotation-stopping structure of the rotating valve is in rotation-stopping cooperation with the rotating wrench, so that the rotating valve can be rotated without contacting the rotating valve, and the convenience and safety of operation are improved; and the exposed structure arranged on the first valve seat or the second valve seat ensures that the rotating wrench can accurately butt joint with the rotation-stopping structure and transmit the rotating torque. BRIEF DESCRIPTION OF DRAWINGS

[0018] Figure 1 FIG. 1 is a structure schematic view of a cement head in the utility model;

[0019] Figure 2 is a sectional view; Figure 1

[0020] Figure 3 ​A rotating valve structure schematic view in the cement head embodiment of the present utility model;

[0021] Figure 4 A sectional view of Figure 3 ;

[0022] Figure 5 A valve body structure schematic view of the rotating valve in the cement head embodiment of the present utility model;

[0023] Figure 6 Another view schematic view of Figure 5 ;

[0024] Figure 7 A kind of working state schematic view of the rotating valve in the cement head embodiment of the present utility model;

[0025] Figure 8 Another working state schematic view of the rotating valve in the cement head embodiment of the present utility model;

[0026] Figure 9 Rubber plug indicator structure schematic view in the cement head embodiment of the present utility model;

[0027] Figure 10 Side sectional view of Figure 7 ;

[0028] Figure 11 Second valve seat structure schematic view in the cement head embodiment of the present utility model;

[0029] Figure 12 First valve seat structure schematic view in the cement head embodiment of the present utility model;

[0030] Figure 13 State indicating disc structure schematic view in the cement head embodiment of the present utility model;

[0031] Figure 14 Limiting pin structure schematic view in the cement head embodiment of the present utility model;

[0032] Figure 15 Upper body structure schematic view in the cement head embodiment of the present utility model;

[0033] Figure 16 Lower body structure schematic view in the cement head embodiment of the present utility model;

[0034] Figure 17 Rotary wrench structure schematic view in the cement head embodiment of the present utility model.

[0035] In the figure: 1, upper body; 2, lower body; 3, rotating wrench; 4, pitching mechanism; 5, limiting piece; 6, rubber plug indicator; 7, injection by ren; 8, blocking pin mechanism; 9, rubber plug; 11, upper runner; 12, first annulus; 13, second sealing ring; 14, second annulus; 15, rotation stopping groove; 16, upper locking block; 17, upper limiting block; 21, lower runner; 22, lower locking block; 23, lower limiting block; 24, corresponding groove; 241, second hole section; 31, state indicating disc; 311, arc-shaped long hole; 32, groove; 321, groove side wall; 322, groove bottom wall; 61, trigger lever; 62, indicator housing; 63, indicating lever; 64, pin shaft; 65, threaded plug; 66, third sealing ring; 81, positioning tube; 811, first flow hole; 82, second valve seat; 821, mounting groove; 822, second mounting hole; 823, first grease injection hole; 824, sealing groove; 825, second grease injection hole; 826, screw hole; 827, positioning protrusion; 83, grease injection valve; 84, bearing; 85, support tube; 851, second flow hole; 852, trigger lever hole; 86, rotary valve; 861, through hole; 862, sealing convex ring; 8621, gap; 863, groove; 87, first valve seat; 871, first mounting hole. DETAILED DESCRIPTION

[0036] The features and performances of the utility model are further described in detail below in combination with the embodiments.

[0037] The cement head provided by the utility model realizes the installation and support of the rotary valve through the first valve seat and the second valve seat arranged in the cement head body, changes the installation position of the rotary valve, and transfers the sealing between the rotary valve and the cement head body to the sealing between the rotary wrench and the cement head body through the rotation stopping cooperation of the rotary valve and the rotary wrench, reduces the sealing structure between the rotary valve and the cement head body, and further effectively reduces or eliminates the leakage risk caused by the sealing failure between the rotary valve and the cement head body in the operation process.

[0038] The embodiment of the cement head in the utility model:

[0039] As shown in Figure 1 and Figure 2 , the cement head provided by the embodiment comprises 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 with the upper body 1, the upper body 1 and the lower body 2 are connected to form a flow channel extending in the axial direction in the interior thereof, the flow channel comprises an upper runner 11 located at the upper body 1, a lower runner 21 located at the lower body 2 and a valve installation cavity communicating the upper runner 11 and the lower runner 21, and a blocking pin mechanism 8 for switching the flow state of the flow channel is installed in the valve installation cavity.

[0040] Specifically, the upper part of the upper body 1 is provided with an internal thread for connecting with a drill pipe, the inside of the upper body 1 is provided with an upper inner hole extending along the axial direction thereof, the upper inner hole comprises a first small hole section and a first hole diameter expansion section connected with the first small hole section; the inside of the lower body 2 is provided with a lower inner hole extending through along the axial direction thereof, the lower inner hole comprises a second small hole section and a second hole diameter expansion section connected with the second small hole section; after the upper body 1 and the lower body 2 are connected, the inner cavity of the first small hole section forms an upper flow channel 11 of the upper body 1, the inner cavity of the second small hole section forms a lower flow channel 21 of the lower body 2, and the first hole diameter expansion section and the second hole diameter expansion section form a valve mounting cavity connecting the upper flow channel 11 and the lower flow channel 21.

[0041] As shown in Figures 2 to 6 In the present embodiment, the blocking pin mechanism 8 comprises a rotary valve 86, which is a ball valve; the rotation axis of the rotary valve 86 is arranged perpendicularly to the central axis of the lower body 2, and the rotary valve 86 is provided with a through hole 861 radially extending through for the cementing plug to pass, i.e. the through hole 861 is used to axially connect the upper flow channel 11 and the lower flow channel 21. Through the through hole 861 of the rotary valve 86, the upper flow channel 11 and the lower flow channel 21 can be conveniently communicated, so as to facilitate the cementing plug 9 to pass during plug launching operation; at the same time, by rotating the rotary valve 86, the communication state of the through hole 861 with the upper flow channel 11 and the lower flow channel 21 can be conveniently switched. The hole diameter of the through hole 861 is larger than the outer diameter of the plug 9, so as to facilitate the plug 9 to smoothly descend during plug launching operation. In the embodiment, the rotary valve 86 can also be a cylindrical valve body.

[0042] As shown in Figure 5 and Figure 6As shown, the through hole 861 is provided with a groove 863 penetrating the rotary valve 86 along a direction perpendicular to the through hole axis and the rotation axis of the rotary valve 86 at the position of the hole opening of at least one end of the through hole 861, and the groove 863 cooperates with the inner wall of the cement head body to form a channel for the cement slurry to pass through. Specifically, the groove wall of the groove 863 is a circular arc surface, that is, the groove 863 is a circular arc groove; the groove 863 cooperates with the inner wall of the valve mounting cavity to form a channel for the cement slurry to pass through; in the embodiment, the groove 863 is arranged at the hole opening position of both sides of the through hole 861 of the rotary valve 86. Of course, in other embodiments, the groove 863 can be arranged only at the hole opening position of one side of the through hole 861; the groove wall of the groove 863 can be square, trapezoidal or other suitable structural forms, which is specifically selected according to actual needs. The rotary valve 86 of the embodiment does not need to be punched on the rotary valve 86, but only needs to be provided with the groove 863 on the rotary valve 86, and the groove 863 cooperates with the inner wall of the valve mounting cavity to form a channel for the fluid to pass through, which effectively simplifies the structure of the rotary valve 86, reduces the manufacturing difficulty of the rotary valve 86, and the formed channel can also better meet the flow requirement; the groove 863 is arranged perpendicular to the through hole axis and the rotation axis of the rotary valve, so that the rotary valve 86 can be rotated by 90° to realize the switching of the flow channel state, which is simple and labor-saving, and compared with the prior art, the groove 863 is arranged at the hole opening position of the through hole 861, so that the structure of the rotary valve 86 is more compact, and the structure of the cement head body can be compact.

[0043] As shown in Figures 2 to 6 , Figure 11 and Figure 12 , in order to facilitate the assembly of the rotary valve 86 and the lower body 2, the cement head body is provided with a first valve seat 87 and a second valve seat 82 arranged oppositely, and the rotary valve 86 is rotatably installed on the first valve seat 87 and the second valve seat 82 through the shafts at both ends. The upper body 1 and the lower body 2 are provided with positioning structures for directly or indirectly positioning the first valve seat 87 and the second valve seat 82 in the up-down direction. By arranging the positioning structures for positioning the first valve seat 87 and the second valve seat 82 in the up-down direction on the upper body 1 and the lower body 2, the installation accuracy of the first valve seat 87 and the second valve seat 82 is ensured, and the stability of the installation of the rotary valve 86 is ensured, so that the loosening or position deviation of the rotary valve 86 or the valve seat caused by vibration or external force is avoided, and the working reliability of the rotary valve 86 is improved.

[0044] As shown in Figures 2 to 6As shown, as a further embodiment, the blocking pin mechanism 8 further comprises a positioning tube 81 provided on the rotary valve for accommodating the cementing plug 9. Specifically, the positioning tube 81 is provided between the rotary valve 86 and the inner top wall of the valve mounting cavity, and the positioning tube 81 constitutes the upper positioning structure of the rotary valve 86. The outer wall of the positioning tube 81 and the inner wall of the valve mounting cavity form a first annular space 12, and the inner cavity of the positioning tube 81 is used to accommodate the cementing plug 9 and forms a passage that communicates the upper flow channel 11 and the through hole 861 of the rotary valve 86 when the plug is thrown. The inner diameter of the positioning tube 81 is the same as the inner diameter of the first small hole diameter section, and a stepped surface for limiting cooperation with the positioning tube 81 is arranged at the orifice of the first small hole diameter section. The end of the positioning tube 81 communicating with the upper flow channel 11 abuts against the stepped surface, and the other end is detachably connected with the first valve seat 87 and the second valve seat 82. The end of the positioning tube 81 abutting against the rotary valve 86 is a spherical surface structure adapted to the rotary valve 86. The assembly of the positioning tube 81 is facilitated, and the cooperation of the positioning tube 81 and the inner wall of the valve mounting cavity to form the first annular space 12 is also facilitated, so that the positioning tube 81 is limited in the valve mounting cavity through the cooperation of the upper body 1 and the rotary valve 86. In other embodiments, the positioning tube 81 can be connected to the first small hole diameter section of the upper body 1 by screw connection.

[0045] In order to facilitate the communication between the first annular space 12 formed between the outer wall of the positioning tube 81 and the wall of the valve mounting cavity and the inner cavity of the positioning tube 81, in the present embodiment, the first flow hole 811 is arranged at the top of the positioning tube 81 close to the first small hole diameter section. In other embodiments, the communicated first annular space 12 and the inner cavity of the positioning tube 81 can be a gap provided between the positioning tube 81 and the inner top wall of the valve mounting cavity. Specifically, the lower end of the positioning tube is fixedly connected to the inner wall of the first hole expanding diameter section of the lower body, and a certain gap is arranged between the upper end of the positioning tube and the connection between the first small hole diameter section and the first hole expanding diameter section.

[0046] As a further implementation, the blocking pin mechanism 8 further comprises a support pipe 85 arranged below the rotary valve 86 for supporting the rotary valve 86, specifically, the support pipe 85 is arranged between the rotary valve 86 and the inner bottom wall of the valve mounting cavity, and the support pipe 85 constitutes the lower positioning structure of the rotary valve 86; the inner cavity of the support pipe 85 forms a passage for connecting the through hole 861 of the rotary valve 86 and the lower flow channel 21; the outer wall of the support pipe 85 and the inner wall of the lower joint 2 form a second annular space 14 together with the recess 863 and the inner wall of the cement head body, which is in communication with the passage and through which the cement slurry passes, and correspondingly, the support pipe is provided with four second flow holes 851 which are in communication with the second annular space 14 and the inner cavity of the support pipe 85. The inner diameter of the support pipe 85 is the same as the inner diameter of the lower flow channel 21, one end of the support pipe 85 in communication with the lower flow channel 21 abuts at the orifice end face of the second small diameter hole section, and the other end is fixedly connected with the first valve seat 87 and the second valve seat 82; wherein, the end of the support pipe 85 abutting with the rotary valve 86 is a spherical surface structure matched with the rotary valve 86. Through the cooperation of the lower body 2 and the rotary valve 86, the support pipe 85 is limited in the valve mounting cavity, and the support pipe 85 provides effective support for the rotary valve 86. In other implementations, a stepped surface matched with the support pipe 85 can be arranged at the orifice of the second small diameter hole section; the support pipe 85 can be connected to the second small diameter hole section by a threaded connection. Of course, the support pipe 85 can also not be arranged.

[0047] In the present embodiment, as shown in Figure 4 , and referring to Figure 9 , the support pipe 85 is further provided with a trigger rod hole 852 for the trigger rod 61 of the rubber plug indicator 6 to pass through.

[0048] As shown in Figures 2 to 6 , Figure 11 and Figure 12 , in the present embodiment, the cross sections of the first valve seat 87 and the second valve seat 82 are both fan ring shapes, the lateral end faces adjacent to the first valve seat 87 and the second valve seat 92 jointly form a third passage with the rotary valve 86 and the inner wall of the cement head body for the cement slurry to pass through; the lower part of the positioning pipe 81 and the upper part of the support pipe 85 are respectively provided with positioning grooves matched with the first valve seat 87 and the second valve seat 82, and the positioning grooves are uniformly provided with connecting holes (not shown in the figure); correspondingly, the two ends of the first valve seat 87 and the second valve seat 82 are respectively provided with positioning protrusions 827 matched with the positioning grooves, and screw holes 826 matched with the connecting holes are arranged on the positioning protrusions 827, and the fastening screws pass through the screw holes 826 and the connecting holes to connect the positioning pipe 81 and the support pipe 85 to the two ends of the first valve seat 87 and the second valve seat 82 respectively.

[0049] Referring to Figure 2 , Figure 4 , Figure 7 and Figure 8As shown, in use, the rotary valve 86 can be rotated by 90° to make the first channel formed by the through hole 861 and the second channel formed by the recess 863 and the inner wall of the cement head body communicate with the lower flow passage 21 respectively, and the side end face of the first valve seat 87 and the second valve seat 92 adjacent to the rotary valve 86 and the inner wall of the cement head body form a third channel for the cement slurry to pass through. By rotating the rotary valve 86 by 90°, the rotary valve 86 can be in two states, one is that the upper flow passage 11, the first channel and the lower flow passage 21 are communicated in the plug-in operation; the other is that the fluid is communicated through the upper flow passage 11, the first flow hole 811, the first annular space 12, the third channel, the second channel, the second annular space 14, the second flow hole 851 and the lower flow passage 21 in the grouting operation. The cement head adopts the structure of the 90° rotary valve 86, which is simple to operate, safe and labor-saving.

[0050] In the embodiment, the rotary valve 86 is rotatably installed on the first valve seat 87 and the second valve seat 82 through the bearings 84 at the axial two ends thereof, and the first valve seat 87 and the second valve seat 82 are respectively provided with mounting holes for mounting the bearings 84. Specifically, as shown in Figures 2 to 6 、 Figure 11 and Figure 12 , the first valve seat 87 is provided with a first mounting hole 871 for rotating cooperation with the rotary valve 86, and the second valve seat 82 is provided with a second mounting hole 822 for rotating cooperation with the rotary valve 86. The axial two ends of the rotary valve 86 are rotatably installed in the first mounting hole 871 of the first valve seat 87 and the second mounting hole 822 of the second valve seat 82 respectively. The first mounting hole 871 and the second mounting hole 822 are respectively provided with the bearings 84, and the axial two ends of the rotary valve 86 are rotatably cooperated with the first valve seat 87 and the second valve seat 82 through the bearings 84. By providing the bearings 84, the frictional resistance of the rotary valve 86 in the rotating process can be reduced, and the state switching of the rotary valve 86 is facilitated.

[0051] It should be noted that, in order to facilitate the connection of the rotating wrench 3 and the rotating valve 86, a side wall through hole (not shown in the figure) is formed on the side wall of the lower body 2, and the rotating wrench 3 is sealingly installed in the side wall through hole; correspondingly, the rotating shaft of one end of the rotating valve 86 is provided with a rotation stopping structure, and the first valve seat 87 or the second valve seat 82 where the end rotating shaft is located is provided with an exposure structure capable of exposing the rotation stopping structure, and one end of the rotating wrench 3 is rotationally matched with the rotation stopping structure. Specifically, the second valve seat 82 is provided with a mounting groove 821 for the rotating wrench 3 to pass through, and the mounting groove 821 constitutes the exposure structure of the second valve seat 82; the second mounting hole 822 is a through hole and is in communication with the mounting groove 821, and is used for the rotating shaft of one end of the rotating valve 86 to pass through. In addition to the second mounting hole 822 and the mounting groove 821, the other structures of the second valve seat 82 are consistent with those of the first valve seat 87. Of course, in other embodiments, the mounting groove 821 can be provided on the first valve seat, and the mounting hole for mounting the bearing on the corresponding first valve seat is a through hole, and correspondingly, an installation groove for the rotating wrench to pass through is provided in communication with the through hole.

[0052] As shown in Figure 2 and Figure 17 , an axial end of the rotating valve 86 is provided with a rotation control structure. Specifically, the rotation control structure is the rotating wrench 3, and the part of the rotating shaft of one end of the rotating valve 86 matched with the rotating wrench 3 is provided with a square column or hexagonal column structure, and the square column or hexagonal column structure constitutes the rotation stopping structure of the rotating valve 86; one end of the rotating wrench 3 is provided with a groove 32, and the square column or hexagonal column is located in the groove 32 when connected, and the groove 32 includes two parallel groove side walls 321 and a groove bottom wall 322, and the two groove side walls 321 are rotationally matched with the parallel side of the square column or hexagonal column. In use, the rotation stopping structure of the rotating valve 86 is sleeved and matched with the rotating wrench 3, and the external rotation torque applied by the rotating wrench 3 can be transmitted to the rotating valve 86 through the square column or hexagonal column structure. Of course, in other embodiments, the rotating wrench can be connected to the axial end of the rotating valve through threads, and correspondingly, the axial end of the rotating valve has an internal thread or an external thread matched with the rotating wrench.

[0053] In order to ensure the sealing performance of the rotating wrench 3 and the lower body 2, a first sealing ring (not shown in the figure) is arranged on the rotating wrench 3.

[0054] As shown in Figures 4 to 6 , Figure 11 and Figure 12As shown, in order to improve the sealing performance when the rotary valve 86 is assembled with the first valve seat 87 and the second valve seat 82, in the embodiment, the first mounting hole 871 and the second mounting hole 822 of the first valve seat 87 and the second valve seat 82 respectively used for mounting the bearing 84 are respectively provided with annular sealing grooves 824 outside the periphery, and correspondingly, the end faces of the two axial ends of the rotary valve 86 are respectively provided with sealing convex rings 862 matched with the sealing grooves 824. After the rotary valve 86 is assembled with the first valve seat 87 and the second valve seat 82, the sealing convex rings 862 are inserted into the sealing grooves 824, and a surface seal is formed between the sealing convex rings 862 and the groove walls of the sealing grooves 824, thereby effectively ensuring the rotary sealing performance between the rotary valve 86 and the first valve seat 87 and the second valve seat 82. At the same time, the sealing convex rings 862 play a role in positioning and supporting the rotary valve 86.

[0055] The two ends of the rotary valve 86 are flat end faces, the first valve seat 87 and the second valve seat 82 have abutting faces in contact with the flat end faces, and the first mounting hole 871 and the second mounting hole 822 are arranged on the abutting faces. The flat end face structure of the rotary valve 86 simplifies the cooperation between the rotary valve 86 and the first valve seat 87 and the second valve seat 82, and ensures the sealing between the rotary valve 86 and the first valve seat 87 and the second valve seat 82 through the contact with the abutting faces of the first valve seat 87 and the second valve seat 82.

[0056] In order to facilitate the lubrication of the bearing 84, in the embodiment, the first valve seat 87 and the second valve seat 82 are provided with a grease injection valve 83, and the first valve seat 87 and the second valve seat 82 are respectively provided with a grease injection hole for injecting grease into the bearing 84 arranged in the mounting hole. Specifically, the sealing groove 824 divides the grease injection hole into a first grease injection hole 823 and a second grease injection hole 825, that is, the two side groove walls of the sealing groove 824 are respectively provided with the first grease injection hole 823 for communicating with the grease injection valve 83 and the second grease injection hole 825 for injecting grease into the bearing, wherein the first grease injection hole 823 and the second grease injection hole 825 are correspondingly arranged, and the two first grease injection holes 823 and the two second grease injection holes 825 are respectively uniformly and spacedly arranged along the circumference of the sealing groove 824; correspondingly, the sealing convex ring 862 comprises four uniformly and spacedly arranged annular protrusions, each annular protrusion is located on the same circumference, and the adjacent annular protrusions have a gap 8621, which constitutes a grease passing structure for passing grease. In other embodiments, the sealing convex ring 862 can be a continuous annular protrusion, and the annular protrusion is provided with a through hole, which constitutes a grease passing structure; or the annular protrusion is provided in two sections. It should be understood that the number of annular protrusions and the structure of the grease passing structure can be reasonably selected as needed. By providing the grease injection hole on the valve seat for injecting grease into the bearing mounting hole, the friction and wear of the bearing can be effectively reduced, which helps to prolong the service life of the rotary valve and the valve seat; at the same time, by providing the grease injection hole on the valve seat, the grease can be conveniently injected into the mounting hole without disassembling the rotary valve or the valve seat, which simplifies the maintenance work of the bearing.

[0057] After the rotary valve 86 is rotationally assembled with the first valve seat 87 and the second valve seat 82, the gap 8621 has a communication state of simultaneously communicating with the first grease injection hole 823 and the second grease injection hole 825 during the rotation of the rotary valve 86. Specifically, when the rotary valve 86 is rotated by 90° relative to the first valve seat 87 and the second valve seat 82, the gap 8621 of the sealing convex ring 862 communicates with the first grease injection hole 823 and the second grease injection hole 825, at this time, the first grease injection hole 823, the gap 8621 and the second grease injection hole 825 form a lubrication channel for lubricating the bearing 84. Through the lubrication channel formed by the first grease injection hole 823, the gap 8621 and the second grease injection hole 825, the bearing 84 can be conveniently lubricated.

[0058] As shown in Figure 2 and Figure 4 , in order to facilitate accurate judgment of the opening or closing state of the rotary valve 86, in the embodiment, the rotary valve 86 is also provided with a valve indicating structure for indicating the communication state of the rotary valve 86, specifically, referring to Figure 13As shown, the valve indicating structure comprises a state indicating disc 31 and a limit pin; the state indicating disc 31 is assembled on the end of the rotary wrench 3 away from the rotary valve 86, and the state indicating disc 31 is provided with an arc-shaped long hole 311, and the two ends of the arc-shaped long hole 311 are provided with first marks or second marks for indicating that the rotary valve 86 is in a first state for passing the rubber plug or a second state for passing the cement slurry, wherein the first marks and the second marks are spaced apart by 90°, and the first marks and the second marks cooperate with the limit pin to indicate the rotation state of the rotary valve 86; the limit pin is fixed on the outer wall of the lower body 2 and located in the rotation stroke of the arc-shaped long hole 311; and the circumferential two ends of the arc-shaped long hole 311 are respectively used for stop cooperation with the limit pin. Through the limit cooperation of the limit pin and the state indicating disc 31, the first indicating position of the rotary valve 86 for passing the rubber plug 9 or the second indicating position of the rotary valve 86 for passing the cement slurry is indicated, and meanwhile, the stop cooperation of the limit pin and the arc-shaped long hole can limit the rotation angle of the rotary wrench 3, thereby playing a role of controlling the rotation angle of the rotary valve 86.

[0059] As shown in Figure 2 , Figure 5 , Figure 9 and Figure 10 , in order to accurately judge whether the rubber plug 9 normally falls, in the embodiment, the rubber plug indicator 6 is fixedly arranged below the rotary valve 86 on the lower body 2. Specifically, the rubber plug indicator 6 comprises an indicator housing 62 fixedly connected with the lower body 2, a trigger rod 61 and a pin shaft 64; one end of the trigger rod 61 is hinged to the inside of the indicator housing 62 through the pin shaft 64, and the other end away from the hinged position extends into the flow channel and at least extends to the axis of the through hole 861 of the rotary valve 86; in the embodiment, the end of the trigger rod 61 away from the hinged position is beyond the axis of the through hole 861 of the rotary valve 86, so that the trigger rod 61 has sufficient contact area with the rubber plug 9. Wherein, the end of the trigger rod 61 cooperating with the pin shaft 64 is provided with a hexagonal hole, and correspondingly, the middle part of the pin shaft 64 is provided with an outer hexagonal structure cooperating with the hexagonal hole of the trigger rod 61, so that the pin shaft 64 and the trigger rod 61 can synchronously rotate; of course, the structure of the trigger rod 61 cooperating with the rotating shaft can be triangular, quadrangular or other relatively rotation-stopping structure, which is not limited in the embodiment. In the use process, the trigger rod 61 is turned over into the indicator housing 62 under the action of its own gravity and the rubber plug 9, so that the trigger rod 61 can be completely retracted, the rubber plug 9 is released by unblocking the rubber plug 9, the downward movement of the rubber plug 9 is not affected due to the trigger rod 61 not being opened in place, and the rubber plug 9 can be smoothly released.

[0060] In the embodiment, one end of the pin shaft 64 is fixedly installed with an indicating rod 63 capable of indicating the opening and closing of the trigger lever 61. Specifically, the indicating rod 63 is located outside the cement head body and is fixed on the pin shaft 64 through a thin nut, and the indicating rod 63 is arranged at 90° with the trigger lever 61. In use, when the trigger lever 61 is flipped to open, the pin shaft 64 rotates with the trigger lever 61 and drives the indicating rod 63 to rotate, so as to indicate the opening of the trigger lever 61; when the trigger lever 61 is reset, the pin shaft 64 is rotated by pulling the indicating rod 63 to flip the trigger lever 61 to reset. Through the position state change of the indicating rod 63, the cementing operator can timely know the opening state of the trigger lever 61, so as to correctly judge the falling condition of the rubber plug 9.

[0061] In order to ensure the sealing performance of the rotating fit between the pin shaft 64 and the indicator housing 62, in the embodiment, a plurality of third sealing rings 66 are arranged between the pin shaft 64 and the indicator housing 62 at the rotating fit position.

[0062] In order to facilitate the cleaning of cement and other sediments in the indicator housing 62, in the embodiment, the indicator housing 62 is further provided with a sand cleaning hole, and the sand cleaning hole is provided with a plug 65. In use, the sediments deposited in the indicator housing 62 can be cleaned through the sand cleaning hole, so as to avoid the jamming of the trigger lever 61 when rotating, which affects the judgment of the falling condition of the rubber plug 9, or the trigger lever 61 cannot be rotated to the position, which affects the downward movement of the rubber plug 9.

[0063] As shown in Figure 2 In order to improve the sealing performance after the upper body 1 and the lower body 2 are connected, in the embodiment, a sealing structure is arranged between the lower body 2 and the upper body 1. Specifically, the lower body 2 is provided with a sealing groove at one end matched with the upper body 1, and the sealing groove is provided with a second sealing ring 13.

[0064] As shown in Figure 1 and Figure 2 In the embodiment, the upper body 1 is provided with an injection by-nipple 7 above the rotary valve 86 and in communication with the upper flow channel 11. Specifically, the upper body 1 is provided with an injection port above the positioning pipe 81 and in communication with the flow channel, and the injection by-nipple 7 is connected to the injection port on the upper body 1 by welding. In other embodiments, the injection by-nipple 7 can be fixedly connected to the upper body 1 by threads or bolts. By connecting the external cementing pipeline through the injection by-nipple 7, the injection of various fluids is realized. Of course, as other embodiments, the injection by-nipple 7 can be in communication with the first annulus 12, and when the plug injection operation is performed, the injected fluid passes through the flow hole provided on the positioning pipe 81 into the first passage through the first annulus 12.

[0065] In the embodiment, the ball throwing mechanism 4 is arranged on the lower body 2 below the blocking pin mechanism 8, and specifically, the ball throwing mechanism 4 is arranged on the second small hole diameter section of the lower body 2. When the ball throwing operation is needed, the ball throwing mechanism 4 is used to throw the ball.

[0066] As shown in Figure 15 and 16 In the embodiment, the upper body 1 and the lower body 2 are connected by a quick release structure; the upper body 1 and the lower body 2 each include a plug-in screwing section for plug-in screwing of the two, and the quick release structure is a locking block arranged on each plug-in screwing section for axial blocking after the upper body 1 and the lower body 2 are screwed to avoid axial disconnection of the two. During operation, the upper body 1 and the lower body 2 can be tightly connected together by a simple rotating action, which simplifies the mounting and dismounting steps, improves the connection stability of the upper body 1 and the lower body 2, and also improves the operation efficiency of the mounting and dismounting of the upper body 1 and the lower body 2.

[0067] Specifically, the locking block includes a plurality of upper locking blocks 16 arranged on the inner wall of the plug-in screwing section of the upper body 1 in the circumferential direction and extending along the axial direction of the upper body 1, and a plurality of lower locking blocks 22 arranged on the outer periphery of the plug-in screwing section of the lower body 2 in the circumferential direction and extending along the axial direction of the lower body 2, and the lower end surface of the upper locking block 16 and the upper end surface of the lower locking block 22 axially stop after the upper body 1 and the lower body 2 are rotated and abutted. After the upper body 1 and the lower body 2 are plug-in screwed, the locking blocks arranged in the circumferential direction of the upper body 1 or the lower body 2 can ensure uniform stress during screwing; the upper body 1 and the lower body 2 are axially blocked by the close contact of the lower end surface of the upper locking block 16 and the upper end surface of the lower locking block 22, which limits the relative movement of the upper body 1 and the lower body 2 in the axial direction, thereby ensuring that the connection of the upper body 1 and the lower body 2 remains stable when subjected to axial force, and also helps to optimize the stress distribution of the locking block, reduce stress concentration phenomenon, and improve the reliability and durability of the connection of the upper body 1 and the lower body 2.

[0068] The upper locking blocks 16 are arranged in four rows along the inner wall of the upper body 1 in the circumferential direction and are evenly arranged along the circumferential direction of the upper body. Each row has three upper locking blocks 16 evenly arranged along the axial extension direction of the upper body 1. Adjacent two groups of upper locking blocks 16 form upper spacing grooves extending along the axial direction of the upper body 1. The upper locking blocks 16 that are circumferentially adjacent and located at the same axial position are at an included angle of 90°. The lower locking blocks 22 are arranged in four rows along the outer wall of the lower body 2 corresponding to the upper locking blocks 16 in the circumferential direction and are evenly arranged along the circumferential direction of the lower body. Each row has three lower locking blocks 22 evenly arranged along the axial extension direction of the lower body 2. Adjacent two groups of lower locking blocks 22 form lower spacing grooves extending along the axial direction of the lower body 2. The lower locking blocks 22 that are circumferentially adjacent and located at the same axial position are at an included angle of 90°. The widths of the upper spacing grooves and the lower spacing grooves are equal to the width of the locking blocks, i.e., the widths of the upper locking blocks 16, the lower locking blocks 22, the upper spacing grooves, and the lower spacing grooves are 1 / 8 of the circumferential length of the upper body 1 or the lower body 2, so as to facilitate the locking blocks to pass through when the upper body 1 and the lower body 2 are connected. In other embodiments, the upper locking blocks 16 and the lower locking blocks 22 can be evenly arranged in two rows, three rows, five rows, or other suitable number of rows in the circumferential direction. In this way, the upper locking blocks 16 or the lower locking blocks 22 that are adjacent and located at the same axial position can have different included angles. Meanwhile, each row of upper locking blocks 16 or lower locking blocks 22 can have two, four, or other suitable number of locking blocks arranged in the axial direction of the cement head body. It should be understood that the number of rows of upper locking blocks 16 and lower locking blocks 22 and the number of locking blocks arranged in each row can be reasonably selected as needed, and this embodiment does not limit the number of rows of upper locking blocks 16 and lower locking blocks 22 and the number of locking blocks arranged in each row. Through such an arrangement, a plurality of 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 abutting, ensures the uniformity of the stress of the upper body 1 and the lower body 2, effectively prevents deformation or damage caused by excessive local stress, and reduces the stress concentration phenomenon of a single locking block.

[0069] In order to avoid excessive rotation of the upper body 1 and the lower body 2 during screwing, so as to ensure that the upper body 1 and the lower body 2 reach the correct preset position, the quick release structure further comprises limiting blocks arranged on the upper body 1 and the upper body 1 respectively to circumferentially block and limit the rotation limit positions of the two bodies. Specifically, the limiting blocks include an upper limiting block 17 arranged on the plug-in and screwing section of the upper body 1 and close to the end inner wall of the lower body 2, and a lower limiting block 23 arranged on the outer periphery of the plug-in and screwing section of the lower body 2 and away from one side of the upper body 1. The circumferential end faces of the upper limiting block 17 and the lower limiting block 23 respectively form circumferential stop end faces for limiting the rotation limit positions of the upper body 1 and the lower body 2. In the present embodiment, the upper limiting block 17 and the lower limiting block 23 are arranged corresponding to the locking blocks in the circumferential direction of the cement head body, and the circumferential width of the upper limiting block 17 and the lower limiting block 23 is preferably set to 1 / 2 of the width of the locking blocks. When the upper body 1 and the lower body 2 are rotated to the preset position, the circumferential end faces of the upper limiting block 17 and the lower limiting block 23 abut against each other, thereby limiting the further rotation of the upper body 1 and the lower body 2 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 circumferential combined width of the upper limiting block 17 and the lower limiting block 23 when stopped is the same as the width of the upper locking block 16 or the lower locking block 22, which enhances the stability of the connection of the upper body 1 and the lower body 2 and ensures the reliability of the cement head body during operation.

[0070] In the present embodiment, the axial width of the limiting block is greater than the axial width of the lock. In this way, the wider axial width of the limiting block can provide a larger contact area, thereby increasing the strength of the contact part and improving the safety of the overall structure. Of course, in other embodiments, 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.

[0071] During installation, the upper spacing groove of the upper body 1 corresponds to the lower locking block 22 of the lower body 2, or the lower spacing groove of the lower body 2 corresponds to the upper locking block 16 of the upper body 1, then the lower body 2 is inserted into the upper body 1 and rotated by a certain angle to make the circumferential end faces of the upper limiting block 17 and the lower limiting block 23 tightly contact, and at the same time the upper locking block 16 and the lower locking block 22 abut against each other to connect the upper body 1 and the lower body 2. In the present embodiment, since the upper locking block 16, the lower locking block 22 and the spacing groove have the same width, when the lower body 2 is inserted into the upper body 1, only 45° rotation is needed to achieve quick installation.

[0072] As Figure 14 , Figure 15 and Figure 16As shown, in the embodiment, a locking structure is arranged between the upper body 1 and the lower body 2 to keep the upper body 1 and the lower body 2 at the rotation limit position, and specifically, the locking structure includes at least one limiting piece 5 fixed on one of the upper body and the lower body by a detachable fastener, and the other of the upper body 1 and the lower body 2 is provided with a positioning groove for the limiting piece 5 to be embedded to stop rotation with the limiting piece 5 in the circumferential direction, and the shape of the positioning groove is matched with the shape of the limiting piece 5. After the upper body 1 and the lower body 2 are connected by the locking block, the circumferential locking of the upper body 1 and the lower body 2 is realized by the positioning groove arranged on the upper body 1 and the lower body 2 and the limiting piece 5 matched with the positioning groove, so as to ensure that the upper body 1 and the lower body 2 can keep a stable connection state after rotation abutting, and effectively prevent the connection from loosening due to vibration or impact during operation; at the same time, the cooperation with the positioning groove can be completed by inserting and pulling out the limiting piece 5, so as to realize the rotation limiting of the upper body 1 and the lower body 2, and the operation process is simple and fast, so that the installation and disassembly process of the cement head is more efficient, which helps to shorten the operation time and improve the overall work efficiency.

[0073] In the embodiment, the limiting piece 5 is provided with a through hole 51 penetrating in the radial direction of the cement head body, one of the upper body 1 or the lower body 2 is provided with a rotation stop groove 15, and the other one which is not provided with the rotation stop groove 15 is provided with a connecting hole 241 extending in the radial direction, and the fastener is connected through the through hole 51 and the connecting hole 241 to realize the fixation of the limiting piece 5. In this way, the limiting piece 5 is fixed in the rotation stop groove by the fastener, and only a single fastener needs to be disassembled and assembled to realize the insertion and pulling out of the limiting piece during installation and disassembly, so as to realize the rotation limiting and releasing of the upper body 1 and the lower body 2, and improve the installation and disassembly operation efficiency of the limiting piece 5; at the same time, the fastener improves the anti-rotation locking effect of the limiting piece 5, and enhances the stability of the connection between the upper body 1 and the lower body 2; and the through hole is arranged to enable the fastener to easily pass through and fix the limiting piece, and simplify the overall assembly process.

[0074] In the embodiment, the connecting hole 241 is a threaded hole, and the fastener is a screw matched with the threaded hole (not marked in the figure). The screw as the fastener matched with the threaded hole can realize a more firm locking effect of the limiting piece 5, so that the connection between the upper body 1 and the lower body 2 is more reliable and stable.

[0075] In the embodiment, the through hole 51 provided on the limiting member 5 for the screw to pass through is a counterbore, and a fastener is arranged in the counterbore to fix the limiting member 5. The counterbore 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 improving the neatness of the appearance of the cement head. At the same time, the counterbore structure can also help to increase the contact area between the fastener and the limiting member. The screw is used as the locking member to cooperate with the threaded hole, which can achieve more secure locking of the limiting member 5 and make the connection between the upper body 1 and the lower body 2 more reliable and stable. At the same time, when the upper body 1 and the lower body 2 need to be assembled or disassembled, the fastener can be easily and quickly disassembled and assembled.

[0076] In the embodiment, the limiting member 5 has a disc-shaped structure. In this way, when the limiting member 5 is inserted into the rotation-stopping groove, the contact area with the rotation-stopping groove can be increased, and a uniform contact area can be provided to disperse stress and improve the strength and stability of the connection. When the fastener is tightened, the limiting member 5 is firmly pressed in the rotation-stopping groove, thereby effectively preventing rotation between the upper body 1 and the lower body 2.

[0077] As a further embodiment, the limiting member 5 is provided in three or more and is uniformly arranged along the circumferential direction of the cement head body. Specifically, the limiting member 5 is provided in four, and each limiting member is uniformly arranged along the circumferential direction of the cement head body. The plurality of limiting members 5 are uniformly distributed along the circumferential direction, which can achieve multi-point locking, thereby enhancing the stability of the connection between the upper body 1 and the lower body 2 and helping to prevent connection failure due to excessive stress on a single point. At the same time, when subjected to external force, the uniformly arranged limiting members 5 can evenly share the load, reduce stress concentration, and improve the durability of the connection. Of course, in other embodiments, the limiting member can be provided in two or five, and it should be understood that the number of limiting members needs to be reasonably arranged according to the connection needs of the upper body and the lower body.

[0078] As a further embodiment, one of the upper body 1 and the lower body 2 that does not have the rotation-stopping groove 15 is provided with a corresponding groove 24 that is in communication with the rotation-stopping groove 15 when the threaded segments of the upper body 1 and the lower body 2 are screwed into place, and the rotation-stopping groove 15 and the corresponding groove 24 together form a positioning groove that is adapted to the shape of the limiting member 5. Specifically, either of the upper body 1 and the lower body 2 has at least one rotation-stopping groove 15 on the end that contacts each other, and the other has a corresponding groove 24 that corresponds to the rotation-stopping groove 15 after the upper body 1 and the lower body 2 are rotated and abutted. The rotation-stopping groove 15 and the corresponding groove 24 form a positioning groove after the upper body 1 and the lower body 2 are screwed, and the shape of the positioning groove is adapted to the shape of the limiting member.

[0079] Specifically, the rotation-stopping groove 15 and the corresponding groove 24 are both semicircular grooves. The semicircular groove structure can be easily processed and manufactured, and can help disperse the stress generated during the connection of the limiting piece 5, reduce stress concentration, facilitate the embedding of the limiting piece 5 into the positioning groove, and enable more accurate positioning.

[0080] In this embodiment, since the positioning groove is enclosed by the rotation-stopping 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 limiting piece 5, the through hole 51 provided on the limiting piece 5 for the fastener to pass through is an eccentric hole.

[0081] In this embodiment, the end of the upper body 1 connected to the lower body 2 is provided with the rotation-stopping groove 15 corresponding to the upper locking block 16, and the rotation-stopping groove 13 passes through the hole wall of the upper body 1, i.e., it is a through groove. The lower body 2 is provided with the corresponding groove 24 corresponding to the lower locking block 22 at the abutting position of the upper body 1. Specifically, the outer circumferential surface of the lower body 2 is stepped, including a large-diameter section with an outer diameter larger than the plug-in screwing section, and the corresponding groove 24 is a blind groove provided on the large-diameter section. The corresponding groove 24 is provided with a connecting hole 241 for screw cooperation. In order 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 and plugging, the rotation-stopping groove 15 and the corresponding groove 24 are accurately aligned and combined into a complete positioning groove. Of course, in other embodiments, when the connection form of the upper body 1 inserted into the lower body 2 is adopted, the rotation-stopping groove 15 can be arranged on the lower body 2, and the corresponding groove 24 can be arranged on the upper body 1. Such an arrangement divides the pin hole into the rotation-stopping groove 15 and the corresponding groove 24 and arranges them on the upper body 1 and the lower body 2, respectively, which helps to improve the compactness of the structure. When the fastening screw is inserted into the complete positioning groove composed of the rotation-stopping groove 15 and the corresponding groove 24, it will pass through the upper body 1 and the lower body 2 at the same time, and through the limiting piece 5 to firmly connect the two together, greatly enhancing the stability of the connection and preventing loosening due to vibration or other reasons. At the same time, since the rotation-stopping groove 15 and the corresponding groove 24 are pre-set, during use, the upper body 1 and the lower body 2 only need to be rotated 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 the work efficiency.

[0082] To further improve the connection stability of the upper body 1 and the lower body 2 after abutting, in the embodiment, the projection of the positioning groove and the corresponding lock block in the axial direction of the cement head body has an overlapping part. Specifically, the centers of the rotation-stopping groove 15 and the corresponding groove 24 are located on the extension line of the center line of the corresponding lock block, that is, the arrangement of the rotation-stopping groove 15 and the corresponding groove 24 in the circumferential direction of the cement head body is consistent with the arrangement of the lock block in the circumferential direction of the cement head body, that is, the number of the rotation-stopping groove 15 and the corresponding groove 24 is consistent with the number of the corresponding lock block column. In this way, during the rotation and abutting of the upper body 1 and the lower body 2, the rotation-stopping groove 15 and the corresponding groove 24 can be conveniently aligned and combined, and the connection problems caused by misalignment can be effectively prevented; at the same time, when the limiting piece 5 is inserted into the positioning groove combined by the rotation-stopping groove 15 and the corresponding groove 24, since the center of the positioning groove coincides with the center line of the lock block, the limiting piece can better bear and disperse the shear force generated during the connection process, which helps to reduce the stress concentration and the potential damage risk; it is also helpful to simplify the design and manufacturing process of the pin hole and the lock block.

[0083] As shown in Figures 1 to 13 Based on the structure description of the cement head described above, the assembly process of the cement head provided by the utility model is briefly described as follows:

[0084] 1) Assemble the rotary valve 86. Install the bearing 84 at the axial ends of the rotary valve 86 of the rotary valve 8, place the combined rotary valve 86 on the support pipe 85, then place the positioning pipe 81 above the rotary valve 86, and then connect the first valve seat 87 and the second valve seat 82 with the support pipe 85 and the positioning pipe 81 respectively.

[0085] 2) Assemble the external components. Weld the ball throwing mechanism 4 and the indicator housing 62 to the lower body 2 respectively, and weld the injection by the ren 7 to the upper body 1.

[0086] 3) Assemble the rotary wrench 3 and the rotary valve 86. Assemble the first sealing ring on the rotary wrench 3, then assemble the rotary wrench 3 on the lower body 2; assemble the rotary valve 86 assembled in step (1) into the lower body 2, and make the axial end of the rotary valve 86 cooperate with the rotary wrench 3; assemble the state indicating disc 31, and adjust the position of the state indicating disc 31 to make it consistent with the state of the rotary valve 86, and assemble the limiting pin.

[0087] 4) Assemble the rubber plug indicator 6. Assemble the trigger lever 61 to the indicator housing 62 through the pin shaft 64, assemble the indicating rod 63 to the pin shaft 64, and adjust the indicating rod 63 to make the trigger lever 61 in a horizontal state.

[0088] 5) Assemble the upper body 1 and the lower body 2. Put the rubber plug 9 into the positioning pipe 81 of the blocking pin mechanism 8, insert the lower body 2 assembled in step (3) into the upper body 1, and connect the lower body 6 and the upper body 1.

[0089] After assembly, the trigger lever 61 of the cement head is in a closed state, the first channel for plug placement operation is in a closed state, and the second channel for grouting operation is in an open state.

[0090] Reference Figures 2 to 4 、 Figure 7 and Figure 8 Based on the structure description of the cement head, the use process of the cement head is briefly described as follows.

[0091] During grouting operation, the through hole 861 of the rotary valve 86 is not communicated with the upper flow channel 11 and the lower flow channel 21, and the rubber plug 9 remains in the assembled position; the upper flow channel 11 is communicated with the lower flow channel 21 through the first flow hole 811, the first annular space 12, the second channel, the second annular space 14 and the second flow hole 851; when the spacer fluid and the cement slurry are injected through the injection by the nozzle 7, the fluid enters the downhole through the upper flow channel 11, the first flow hole 811, the first annular space 12, the second channel, the second annular space 14, the second flow hole 851 and the lower flow channel 21.

[0092] During plug placement operation, on the basis of the state of the rotary valve 86 during the aforementioned grouting operation, the rotary wrench 3 is rotated by 90° to make the first channel of the rotary valve 86 communicated with the upper flow channel 11 and the lower flow channel 21, and the second channel is closed; when the spacer fluid (generally clean water) enters through the injection by the nozzle 7, the spacer fluid enters the inner cavity of the positioning pipe 81 through the upper flow channel 11, drives the rubber plug 9 to move downward, and then moves downward through the through hole 861, the inner cavity of the support pipe 85 and the lower flow channel 21 to enter the downhole, thereby realizing plug placement.

[0093] As other embodiments, the upper body and the lower body are connected in a threaded connection manner; or the upper body and the lower body are respectively provided with flange surfaces at one end connected with each other, and the connection of the upper body and the lower body is realized in a flange bolt connection manner.

[0094] As other embodiments, the upper inner hole of the upper body and the lower inner hole of the lower body are respectively provided with positioning steps for positioning the first valve seat and the second valve seat, and during assembly, the axial two ends of the first valve seat and the second valve seat are respectively jacked on the positioning steps.

[0095] As other embodiments, the side wall perforation for penetrating the rotary wrench is arranged on the upper body; of course, the position of the side wall perforation can be reasonably arranged according to the connection mode and structure of the upper body and the lower body.

[0096] As other embodiments, the first grease injection hole and the second grease injection hole are not arranged correspondingly, the grease structure on the convex ring is aligned with the first grease injection hole and the second grease injection hole in sequence, and the grease is automatically distributed to the position needing lubrication when the rotary valve rotates.

[0097] As other embodiments, the rotating shaft of the rotary valve is directly rotatably installed in the mounting hole of the first valve seat and the second valve seat. As other embodiments, the rotary valve is a cylindrical surface structure, and accordingly, the upper end of the support pipe and the lower end of the positioning pipe have a structure adapted to the cylindrical surface structure of the rotary valve.

[0098] The above is only a preferred embodiment of the present application, and is not used to limit the present application. The patent protection scope of the present application is subject to the claims, and any equivalent structural changes made by referring to the content of the specification and drawings of the present application should also be included in the protection scope of the present application.

Claims

1. A cement head, characterized in that: The device includes a cement head body and a rotary valve. The cement head body has a first valve seat and a second valve seat arranged opposite to each other. The rotary valve is rotatably mounted on the first valve seat and the second valve seat via rotating shafts at both ends. The cement head body includes an upper body and a lower body. The upper body and the lower body are provided with positioning structures that directly or indirectly position the first valve seat and the second valve seat in the vertical direction. A through hole is opened on the side wall of the upper body or the lower body, and a rotary wrench is sealed and installed in the through hole. A non-rotation structure is provided on the rotating shaft at one end of the rotary valve, and an exposed structure is provided on the first valve seat or the second valve seat where the rotating shaft is located, which can expose the non-rotation structure. One end of the rotary wrench is engaged with the non-rotation structure to prevent rotation.

2. The cement head according to claim 1, characterized in that: The rotating shafts at both ends of the rotary valve are rotatably mounted on the first valve seat and the second valve seat via bearings, and the first valve seat and the second valve seat are respectively provided with mounting holes for mounting the bearings.

3. The cement head according to claim 2, characterized in that: The first valve seat and the second valve seat are respectively provided with grease injection holes that communicate with the corresponding mounting holes. The grease injection holes are used to inject grease into the mounting holes.

4. The cement head according to claim 2 or 3, characterized in that: The mounting hole is surrounded by an annular groove, which divides the grease injection hole into a first grease injection hole and a second grease injection hole. The two end faces of the rotary valve are respectively provided with convex rings, each convex ring is inserted into the corresponding annular groove, and each convex ring is provided with a grease passage structure. The grease passage structure has a communication state with the first grease injection hole and the second grease injection hole during the rotation of the rotary valve.

5. The cement head according to claim 2 or 3, characterized in that: Both ends of the rotary valve are flat, and the first valve seat and the second valve seat each have a mating surface that contacts the flat end face. The mounting hole is located on the mating surface.

6. The cement head according to claim 1, 2, or 3, characterized in that: A support tube for supporting the rotary valve is provided below the rotary valve. The upper end of the support tube is fixedly connected to the lower ends of the first valve seat and the second valve seat, and the lower end of the support tube abuts against the lower body.

7. The cement head according to claim 6, characterized in that: A positioning tube for accommodating cementing plugs is provided above the rotary valve. The lower end of the positioning tube is fixedly connected to the upper ends of the first valve seat and the second valve seat, and the upper end of the positioning tube abuts against the upper body.

8. The cement head according to claim 7, characterized in that: The rotary valve has a spherical structure, and the upper end of the support tube and the lower end of the positioning tube both have spherical structures adapted to the rotary valve.

9. The cement head according to claim 1, 2, or 3, characterized in that: The rotary valve is provided with a radially penetrating through hole for the cementing plug to pass through. At least one end of the through hole is provided with a groove that penetrates the rotary valve along a direction perpendicular to the axis of the through hole and the rotation axis of the rotary valve. The groove is used to form a channel for cement slurry to pass through together with the inner wall of the cement head body.

10. The cement head according to claim 1, 2, or 3, characterized in that: The anti-rotation structure on the rotating shaft is a square or hexagonal column. One end of the rotating wrench is provided with a groove, and the square or hexagonal column is located in the groove. The groove includes two parallel side walls and a bottom wall, and the two side walls are anti-rotationally engaged with the parallel side of the square or hexagonal column.

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