Well head automatic control device for well cementation

Abstract

The invention relates to the technical field of well cementation operation, in particular to a well cementation wellhead automatic control device which comprises a cement head body, an upper bypass connector, a lower bypass connector, a bypass manifold, a valve ball, a gland, a rotary stop pin, a ball valve actuator, a stop pin actuator and an indication remote transmission device. An upper bypass connector capable of being communicated with the grouting channel is arranged on the right side of the upper portion of the cement head body, a lower bypass connector capable of being communicated with the grouting channel is arranged on the right side of the lower portion of the cement head body, and a bypass manifold is fixedly communicated between the right end of the upper bypass connector and the right end of the lower bypass connector. The ball valve is reasonable and compact in structure and convenient to use, the valve ball is made to rotate by controlling the ball valve actuator, and therefore conduction of the main flow channel or the bypass flow channel is switched; the stop pin actuator is controlled to enable the locking rod to move forwards so as to release the limit on the rotation of the rotary stop pin, so that the rotary stop pin is turned clockwise to enter the stop pin cavity, the plugging of the rubber plug is released, and the stop pin device has the characteristics of accuracy, high efficiency and rapidness.

Description

Technical Field

[0001] The invention relates to the technical field of cementing operations and relates to an automatic control device for a cementing wellhead. Background Art

[0002] The cement head is one of the most important tools in the cementing construction process. At present, the cement heads commonly used at home and abroad are composed of the cement head body, the stop pin release mechanism, multiple plug valves, the cement injection channel, the slurry replacement channel, the cleaning channel, etc. The cement head has a complex structure, cumbersome operation, time-consuming and labor-intensive, and high production cost. With the development of more and more deep wells and ultra-deep wells, the wellhead pressure is getting higher and higher during the cementing construction process. In the cementing construction process of conventional cement heads, there is no remote control equipment and automatic actuator. It takes manpower to repeatedly open and close multiple plug valves and stop pin release mechanisms to complete the construction work. The stop pin needs to be rotated 10 to 13 times to open, which is time-consuming. In addition, when replacing the slurry, there is no indication of the rubber plug going down after the stop pin is opened. During the construction process, there is high pressure in the cement head, which endangers personal safety.

[0003] A Chinese patent document with the announcement number CN 104295265 B discloses a convenient opening indicating cement head, which is characterized in that it includes a cement head body, a pressure cap, a slurry replacement inlet joint, a cement slurry inlet joint, a rotating stop pin, a stop pin control valve assembly and an indicating device; a grouting channel is provided inside the cement head body, and a pressure cap capable of sealing the grouting channel is fixedly and sealedly installed on the upper end of the cement head body; a slurry replacement inlet joint connected to the grouting channel is provided at the upper part of the cement head body; a cement slurry inlet joint connected to the grouting channel is provided at the lower part of the cement head body; a rotating stop pin capable of blocking the downward movement of the rubber plug is installed in the grouting channel between the slurry replacement inlet joint and the cement slurry inlet joint, an upward turning hinge groove is provided on the inner wall of the grouting channel on the left side of the rotating stop pin, a pin shaft is fixed on the left end of the rotating stop pin, and the pin shaft is hingedly installed in the upward turning hinge groove; a stop pin capable of horizontally limiting or releasing the limit of the right end of the rotating stop pin is installed on the cement head body on the right side of the rotating stop pin The invention relates to a stop pin control valve assembly for realizing flipping of the position; a lower accommodating groove is provided on the inner wall of the grouting channel at the lower end of the upper flip hinge groove for accommodating the rotating stop pin after the rotating stop pin flips and falls; the front end of the pin shaft passes through the cement head body and is fixedly installed with an indicating device that can indicate the opening and closing of the rotating stop pin; wherein: the stop pin control valve assembly includes a valve core, a fixed end cover and a drive shaft; the cement head body on the right side of the rotating stop pin is provided with a control valve mounting hole connected to the grouting channel, a rotatable valve core is installed in the right part of the control valve mounting hole, an arc-shaped limit platform protruding to the left is provided at the lower left end of the valve core and is located in the control valve mounting hole, and the right end of the rotating stop pin rests on the concave arc surface at the upper end of the arc-shaped limit platform; a drive shaft is fixedly installed in the middle of the right end of the valve core, and the drive shaft is located outside the right part of the cement head body; a fixed end cover that can limit the horizontal movement of the valve core is fixedly installed at the right end of the control valve mounting hole, and the fixed end cover is sleeved on the drive shaft. The convenient opening indicating cement head is an invention patent applied for by the applicant on October 15, 2014. It has the following technical defects in its actual use and operation for many years: (1) The arc-shaped limit platform used to limit the right end of the rotating stop pin generates a large downward force due to the rubber plug during use, which is very likely to cause the arc-shaped limit platform to deform, thereby making the stop pin control valve unable to rotate, that is, the rotating stop pin cannot be opened and closed normally; (2) The drive shaft is driven by the hand wheel to transmit torque. During the opening and closing process of the rotating stop pin, rotating the hand wheel is time-consuming and laborious, and the hand wheel cannot be rotated into place or out of position, which will cause the rotating stop pin to be unable to reset or open; (3) The high-pressure cement slurry injected through the cement slurry inlet joint will impact and wear the inner wall of the cement head body, affecting the life of the device.

[0004] A Chinese patent document with a publication number of CN 209875104 U discloses a high-pressure well fast plugging cementing head, characterized in that it comprises an upper control valve assembly, a lower control valve assembly and a lower joint connected in sequence, wherein the upper control valve assembly and the lower control valve assembly are respectively provided with an upper rubber plug and a lower rubber plug, and the upper control valve assembly, the lower control valve assembly and the lower joint are respectively connected with a plug valve I, a plug valve II and a plug valve III; the upper control valve assembly comprises an upper shell, one end of the upper shell is connected with a pressure cap by a thread, the interior of the upper shell is a hollow structure, a step hole a is opened on the side wall of the upper shell, an upper pin is provided in the step hole a, the upper pin is fixed in the step hole a by an upper nut matched therewith, the upper pin is connected with an upper valve body, the upper valve body and the upper rubber plug are both located in the hollow structure of the upper shell, and the upper rubber plug is located above the upper valve body, and the upper shell is connected with the plug valve I through a high-pressure pipe fitting. The screw-rotating pin shaft and the annular valve body used in the high-pressure well quick plugging cementing cement head have the following technical defects: (1) the ring is easily deformed under pressure; (2) the rotating pin shaft is prone to not rotating into place or being out of place; (3) it is impossible to observe whether the annular valve body has rotated into place.

[0005] The Chinese patent document with the announcement number CN 87216818 U discloses a cement head rotating handle type stop pin mechanism for cementing wells in oil and gas drilling projects, which is composed of a stop pin box, a control handle rotating handle type stop pin, a turn handle shaft, a pressure plate, a safety pin, a sealing roll, and a fixing nut. The characteristics of the invention are that the turn handle stop pin, the control handle, and the turn handle shaft are connected by a spline, and when the control handle is reversed by 90°, the turn handle stop pin is in a fully open state, and when the control handle is rotated back by 90°, the turn handle stop pin is in a closed state. The turn handle type stop pin mechanism has the following technical defects: (1) the rotating pin shaft is prone to not rotating in place or off-position; (2) it is impossible to observe whether the valve body is rotated in place. Summary of the invention

[0006] The present invention provides an automatic control device for cementing wellhead, which overcomes the shortcomings of the above-mentioned prior art and can effectively solve the problem that the existing cement head cannot monitor whether the stop pin is rotated into place, and can further solve the problem that the switching between the main flow channel and the bypass flow channel is difficult and time-consuming.

[0007] The technical solution of the present invention is achieved through the following measures: a cementing wellhead automatic control device includes a cement head body, an upper bypass joint, a lower bypass joint, a bypass manifold, a valve ball, a gland, a rotating stop pin, a ball valve actuator, a stop pin actuator and an indication remote transmission device, a cement head body is provided with a grouting channel that passes through from top to bottom, an upper bypass joint that can be connected to the grouting channel is provided on the right side of the upper part of the cement head body, a lower bypass joint that can be connected to the grouting channel is provided on the right side of the lower part of the cement head body, and a bypass manifold is fixedly connected between the right end of the upper bypass joint and the right end of the lower bypass joint; a cement head corresponding to the position of the upper bypass joint A valve ball is arranged in the body, a main flow channel which passes through from top to bottom is arranged on the valve ball, a bypass flow channel which can be connected with the main flow channel is arranged on the left side of the valve ball, a gland is fixedly installed on the inner side of the upper end of the cement head body, an upper ball table groove which matches the upper part of the valve ball is arranged on the inner side of the lower end of the gland, a support ring platform is arranged on the inner side of the cement head body corresponding to the outer position of the lower part of the valve ball, a lower ball table groove which matches the lower part of the valve ball is arranged on the inner side of the upper end of the support ring platform, a ball valve actuator is arranged on the front side of the cement head body corresponding to the front position of the valve ball, the ball valve actuator includes a valve stem and a first driving device, the front side of the valve ball is connected with the valve stem in driving manner, and the front side of the cement head body is provided with a valve stem which can make the valve stem A first driving device for rotation; a stop pin cavity is provided on the inner side of the left part of the cement head body corresponding to the position between the upper bypass joint and the lower bypass joint, and a rotating stop pin is provided in the grouting channel, the left end of which is hinged to the upper part of the stop pin cavity through an articulated shaft; the front end of the articulated shaft is located outside the cement head body, and a stop pin actuator is provided on the front side of the cement head body corresponding to the front position of the articulated shaft, and the stop pin actuator includes a locking block, a locking rod and a second driving device, a locking block is fixedly installed at the front end of the articulated shaft, a socket is provided on the locking block, a locking rod is provided in the socket, and a second driving device that can move the locking rod forward and backward is provided on the front side of the cement head body; the rear end of the articulated shaft is located Outside the cement head body, the indicating remote transmission device includes a magnetic positioning rotating sleeve, a magnetic induction identifier, a first magnetic block, a second magnetic block and a front-end communication module. The magnetic positioning rotating sleeve is fixedly installed on the outer side of the rear end of the hinge shaft. The first magnetic block and the second magnetic block are respectively arranged on the outer side of the rear end of the magnetic positioning rotating sleeve. A magnetic induction identifier that can perform magnetic induction identification with the first magnetic block and the second magnetic block respectively is arranged on the rear side of the cement head body corresponding to the upper position of the rear end of the magnetic positioning rotating sleeve; the magnetic induction identifier is connected to the front-end communication module, the front-end communication module is connected to the terminal control module, and the terminal control module is respectively connected to the first drive device and the second drive device.

[0008] The following are further optimizations and / or improvements to the above technical solutions: The first driving device may include a first reducer and a first motor, wherein the output end of the first motor is connected to the input end of the first reducer, and the front end of the valve stem is connected to the output end of the first reducer.

[0009] The above-mentioned second driving device may include a second reducer, a second motor and a threaded sleeve. The output end of the second motor is connected to the input end of the second reducer. The threaded sleeve is transmission-connected to the output end of the second reducer. A locking rod is threadedly connected to the inner thread of the threaded sleeve.

[0010] The above may also include an O-ring, an O-ring is provided between the inner side of the lower end of the pressure cover and the outer side of the upper part of the valve ball, an O-ring is provided between the inner side of the upper end of the support ring platform and the outer side of the lower part of the valve ball, at least one O-ring is provided between the pressure cover and the cement head body at an upper and lower interval, and at least one O-ring is provided between the outer side of the middle part of the hinge shaft and the cement head body at a front-to-back interval.

[0011] The above-mentioned can also include a quick-release upper joint, a quick-release lower joint and a set screw. The inner side of the lower end of the cement head body is fixedly installed with a quick-release upper joint through a threaded connection, and the outer side of the lower end of the quick-release upper joint is fixedly installed with a quick-release lower joint; the outer side of the lower end of the cement head body is fixedly installed with the quick-release upper joint through a set screw.

[0012] The present invention has a reasonable and compact structure and is easy to use. The ball valve actuator is controlled to rotate the valve ball, thereby switching the conduction of the main channel or the bypass channel; the locking rod is controlled to move forward by the gear pin actuator to release the limit on the rotation of the rotating gear pin, so that the rotating gear pin is turned clockwise into the gear pin cavity, and the blockage of the rubber plug is released; by setting an indicating remote transmission device, the turning state of the rotating gear pin can be accurately judged from the remote end, thereby correctly judging the falling state of the rubber plug, and it has the characteristics of accuracy, efficiency and speed. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Attached Figure 1 It is a schematic diagram of the front cross-sectional structure of embodiments 1 to 5 of the present invention.

[0014] Attached Figure 2 For attachment Figure 1 Schematic diagram of the main cross-sectional structure in use.

[0015] Attached Figure 3 For attachment Figure 1 Schematic diagram of the left-side partial cross-sectional structure.

[0016] Attached Figure 4 For attachment Figure 1 A top-down enlarged structural diagram of the remote indication transmission device.

[0017] Attached Figure 5 For attachment Figure 1 A rear-view enlarged structural diagram of the middle indicator remote transmission device.

[0018] The codes in the accompanying drawings are: 1 is the cement head body, 2 is the upper bypass joint, 3 is the lower bypass joint, 4 is the bypass manifold, 5 is the valve ball, 6 is the pressure cover, 7 is the rotating stop pin, 8 is the grouting channel, 9 is the main channel, 10 is the bypass channel, 11 is the support ring, 12 is the valve stem, 13 is the stop pin cavity, 14 is the hinge shaft, 15 is the locking block, 16 is the locking rod, 17 is the magnetic positioning rotating sleeve, 18 is the magnetic induction identifier, 19 is the first magnetic block, 20 is the second magnetic block, 21 is the first reducer, 22 is the first motor, 23 is the second reducer, 24 is the second motor, 25 is the O-ring, 26 is the quick-release upper joint, and 27 is the quick-release lower joint. DETAILED DESCRIPTION

[0019] The present invention is not limited by the following embodiments, and specific implementation methods can be determined based on the technical solution of the present invention and actual conditions.

[0020] In the present invention, for the convenience of description, the relative position relationship of each component is described according to the attached Figure 1 The positional relationships such as front, back, top, bottom, left, and right are described according to the layout directions of the drawings in the specification.

[0021] The present invention will be further described below in conjunction with embodiments and drawings: Embodiment 1: As attached Figure 1 , 2As shown in Figures 3, 4 and 5, the cementing wellhead automatic control device comprises a cement head body 1, an upper bypass joint 2, a lower bypass joint 3, a bypass manifold 4, a valve ball 5, a gland 6, a rotating stop pin 7, a ball valve actuator, a stop pin actuator and an indication remote transmission device. A grouting channel 8 which passes through from top to bottom is provided in the cement head body 1. An upper bypass joint 2 which can be communicated with the grouting channel 8 is provided on the upper right side of the cement head body 1. A lower bypass joint 3 which can be communicated with the grouting channel 8 is provided on the lower right side of the cement head body 1. A bypass manifold 4 is fixedly connected between the right end of the upper bypass joint 2 and the right end of the lower bypass joint 3. A valve ball 5 is provided in the cement head body 1 corresponding to the position of the upper bypass joint 2. The valve ball 5 is provided with an upper and a lower A main flow channel 9 is connected thereto, and a bypass flow channel 10 which can be connected to the main flow channel 9 is provided on the left side of the valve ball 5. A pressure cap 6 is fixedly installed on the inner side of the upper end of the cement head body 1, and an upper ball table groove matching the upper part of the valve ball 5 is provided on the inner side of the lower end of the pressure cap 6. A support ring platform 11 is provided on the inner side of the cement head body 1 corresponding to the outer position of the lower part of the valve ball 5, and a lower ball table groove matching the lower part of the valve ball 5 is provided on the upper inner side of the support ring platform 11. A ball valve actuator is provided on the front side of the cement head body 1 corresponding to the front position of the valve ball 5. The ball valve actuator includes a valve stem 12 and a first driving device. The front side of the valve ball 5 is transmission-connected to the valve stem 12, and the front side of the cement head body 1 is provided with a first driving device capable of rotating the valve stem 12; corresponding to the upper bypass A stop pin cavity 13 is provided on the inner side of the left part of the cement head body 1 between the through joint 2 and the lower bypass joint 3, and a rotating stop pin 7 is provided in the grouting channel 8, the left end of which is hinged to the upper part of the stop pin cavity 13 through a hinge shaft 14; the front end of the hinge shaft 14 is located outside the cement head body 1, and a stop pin actuator is provided on the front side of the cement head body 1 corresponding to the front position of the hinge shaft 14, and the stop pin actuator includes a locking block 15, a locking rod 16 and a second driving device, a locking block 15 is fixedly installed on the front end of the hinge shaft 14, a socket is provided on the locking block 15, and a locking rod 16 is provided in the socket, and a second driving device capable of moving the locking rod 16 forward and backward is provided on the front side of the cement head body 1; the rear end of the hinge shaft 14 is located outside the cement head body 1, the indication remote transmission device includes a magnetic positioning rotating sleeve 17, a magnetic induction identifier 18, a first magnetic block 19, a second magnetic block 20 and a front-end communication module. The magnetic positioning rotating sleeve 17 is fixedly installed on the outer side of the rear end of the hinge shaft 14. The first magnetic block 19 and the second magnetic block 20 are respectively arranged on the outer side of the rear end of the magnetic positioning rotating sleeve 17. The rear side of the cement head body 1 corresponding to the upper position of the rear end of the magnetic positioning rotating sleeve 17 is provided with a magnetic induction identifier 18 that can perform magnetic induction identification with the first magnetic block 19 and the second magnetic block 20 respectively; the magnetic induction identifier 18 is connected to the front-end communication module, the front-end communication module is connected to the terminal control module, and the terminal control module is respectively connected to the first driving device and the second driving device.

[0022] During use, the locking block 15 is manually pulled to flip the rotating stop pin 7 from the stop pin cavity 13 to a horizontal state. When the rotating stop pin 7 is in a horizontal state, the insertion hole on the locking block 15 corresponds to the position of the locking rod 16, so that the locking rod 16 moves backward and is inserted into the insertion hole to limit the rotating stop pin 7; the ball valve actuator is controlled to rotate the valve ball 5, thereby switching the conduction of the main flow channel 9 or the bypass flow channel 10; the stop pin actuator is controlled to move the locking rod 16 forward to release the limit on the rotation of the rotating stop pin 7. At this time, the rotating stop pin 7 flips clockwise into the stop pin cavity 13 under the action of its own gravity and the rubber plug. , that is, to release the blockage of the rubber plug and release the rubber plug, so as to avoid the wear of the downward rubber plug caused by the rotating stop pin 7 not being opened in place, so that the rubber plug can be released smoothly, safely and reliably; by setting the indicating remote transmission device, the flipping state of the rotating stop pin 7 can be accurately pointed out, so as to correctly judge the falling situation of the rubber plug; by setting the stop pin cavity 13, the rotating stop pin 7 can be completely retracted, so as to avoid part of the rotating stop pin 7 being located in the grouting channel 8 and affecting the downward movement of the rubber plug, effectively solving the problem that the existing cement head cannot monitor whether the stop pin is rotated into place, and further solving the problem that the switching between the main channel 9 and the bypass channel 10 is difficult and time-consuming.

[0023] During use, the terminal control module is set to facilitate remote control of the ball valve actuator to rotate the valve ball 5, and the terminal control module is set to facilitate remote control of the gear pin actuator to unlock or lock the locking rod 16. The magnetic induction identifier 18 transmits the position signals of the first magnetic block 19 and the second magnetic block 20 respectively through the front-end communication module to the terminal control module, so that the flipping state of the rotating gear pin 7 can be accurately judged from the remote end, effectively solving the problem of the lack of remote control equipment and automatic execution device in the existing conventional cement head cementing construction process.

[0024] According to the requirements, the angle between the first magnetic block 19 and the second magnetic block 20 and the axis line of the hinge shaft 14 is 90°, so that when the first magnetic block 19 approaches the magnetic induction identifier 18, it represents that the rotating gear pin 7 is retracted into the gear pin cavity 13, and when the second magnetic block 20 approaches the magnetic induction identifier 18, it represents that the rotating gear pin 7 is opened into place; in addition, the position of the front-end communication module can be located on the magnetic induction identifier 18, and its communication method matches the terminal control module.

[0025] According to the requirements, the second driving device adopts the existing well-known technology, which can be a gear rack transmission, a screw nut transmission, an electric push rod, etc.

[0026] The above-mentioned cementing wellhead automatic control device can be further optimized and / or improved according to actual needs: Embodiment 2: As attached Figure 1 , 2As shown in , 3, 4, and 5, the first driving device includes a first reducer 21 and a first motor 22, the output end of the first motor 22 is connected to the input end of the first reducer 21, and the front end of the valve stem 12 is connected to the output end of the first reducer 21. During use, the valve stem 12 is driven to rotate by the first motor 22 and the first reducer 21, thereby switching the conduction of the main flow channel 9 or the bypass flow channel 10, which is convenient for completing the processes of installing rubber plugs, injecting pre-fluid, injecting cement slurry, replacing slurry and cleaning in cementing operations. According to requirements, the rotation range of the valve stem 12 can be an initial position and a final position, and its specific rotation angle can be controlled by the number of rotations and forward and reverse rotation of the output end of the first motor 22; in addition, the rear end of the valve stem 12 can be square, and the front side of the valve ball 5 can be provided with a square hole, so that the torque can be transmitted after the rear end of the valve stem 12 is inserted.

[0027] Embodiment 3: As attached Figure 1 , 2 As shown in Figures 3, 4, and 5, the second driving device includes a second reducer 23, a second motor 24, and a threaded sleeve. The output end of the second motor 24 is connected to the input end of the second reducer 23, the threaded sleeve is connected to the output end of the second reducer by transmission, and the threaded sleeve is internally threaded with a locking rod 16. During use, the threaded sleeve is driven to rotate by the second motor 24 and the second reducer 23, so as to control the locking rod 16 threadedly connected to the threaded sleeve to move forward and backward, thereby completing the release of the limit on the rotation of the rotating gear pin 7 and the limit on the rotation of the rotating gear pin 7. According to the requirements, the movement range of the locking rod 16 can be a locking position and an unlocking position, and its specific movement range can be controlled by the number of rotations and forward and reverse rotations of the output end of the second motor 24.

[0028] Embodiment 4: As attached Figure 1 , 2 , 3, 4, and 5, an O-ring 25 is provided between the inner side of the lower end of the gland 6 and the outer side of the upper part of the valve ball 5, an O-ring 25 is provided between the inner side of the upper end of the support ring 11 and the outer side of the lower part of the valve ball 5, at least one O-ring 25 is provided between the gland 6 and the cement head body 1, and at least one O-ring 25 is provided between the outer side of the middle part of the hinge shaft 14 and the cement head body 1. In the process of use, the sealing between the valve ball 5 and the cement head body 1 is ensured by such an arrangement.

[0029] Embodiment 5: As attached Figure 1 , 2As shown in , 3, 4, and 5, it also includes a quick-install upper joint 26, a quick-install lower joint 27, and a set screw. The quick-install upper joint 26 is fixedly installed on the inner side of the lower end of the cement head body 1 through a threaded connection, and the quick-install lower joint 27 is fixedly installed on the outer side of the lower end of the quick-install upper joint 26; the outer side of the lower end of the cement head body 1 is fixedly installed with the quick-install upper joint 26 through a set screw. In the process of use, this arrangement facilitates the connection between the cement head body 1 and the lower pipe string.

[0030] The above technical features constitute the embodiments of the present invention, which have strong adaptability and implementation effect. Non-essential technical features can be added or reduced according to actual needs to meet the requirements of different situations.

[0031] The specific use process of the best embodiment of the present invention can be: (1) Installing the rubber plug: first remove the gland 6, control the ball valve actuator through the terminal control module to drive the valve stem 12 to rotate, and the valve stem 12 drives the valve ball 5 to rotate until its main flow channel 9 is connected with the grouting channel 8, manually turn the locking block 15 to flip the rotating stop pin 7 from the stop pin cavity 13 to a horizontal state, and control the stop pin actuator through the terminal control module to move the locking rod 16 backward and insert it into the insertion hole to limit the rotating stop pin 7, then install the rubber plug from the upper end entrance of the cement head body 1, so that the rubber plug is in the grouting channel 8, and install the gland 6; (2) Injecting pre-fluid: Connect the pipeline to the upper end joint of the gland 6, control the ball valve actuator through the terminal control module, drive the valve stem 12 to rotate, and the valve stem 12 drives the valve ball 5 to rotate until its bypass channel 10 is connected with the grouting channel 8, keep the stop pin locked, ensure that the rubber plug is in the grouting channel 8 above the stop pin, and inject pre-fluid. The pre-fluid flows out from the central channel of the gland 6, the bypass channel 10, the main channel 9, the upper bypass joint 2, the bypass manifold 4, the lower bypass joint 3 and the grouting channel 8 to the casing below the cement head body 1; (3) Injecting cement slurry: After the injection of the pre-fluid is completed, cement slurry is injected. The cement slurry flows out from the central channel of the gland 6, the bypass flow channel 10, the main flow channel 9, the upper bypass joint 2, the bypass manifold 4, the lower bypass joint 3 and the grouting channel 8 to the casing below the cement head body 1; (4) Slurry replacement: After the slurry injection is completed, the ball valve actuator is controlled by the terminal control module to drive the valve stem 12 to rotate. The valve stem 12 drives the valve ball 5 to rotate until its main channel 9 is connected with the grouting channel 8. Then, the stopper pin actuator is controlled by the terminal control module to move the locking rod 16 forward, release the limit on the rotating stopper pin 7, and the rubber plug moves downward under the pressure of the slurry replacement fluid, driving the rotating stopper pin 7 to rotate. At this time, the articulated shaft 14 and the magnetic positioning rotating sleeve 17 on the articulated shaft 14 rotate synchronously with the rotating stopper pin 7, and the first magnetic block 19 and the second magnetic block 20 respectively change their relative positions with the magnetic induction identifier 18. The induction signal is wirelessly transmitted to the terminal control module through the front-end communication module, realizing the digital display of the rubber plug moving downward; (5) Cleaning the pipeline: After the slurry replacement is completed, the ball valve actuator is controlled by the terminal control module to drive the valve stem 12 to rotate. The valve stem 12 drives the valve ball 5 to rotate until its bypass channel 10 is connected with the grouting channel 8, and an appropriate amount of cleaning liquid is injected. The cleaning liquid flows out from the central channel of the gland 6, the bypass channel 10, the main channel 9, the upper bypass joint 2, the bypass manifold 4, the lower bypass joint 3 and the grouting channel 8 to the casing below the cement head body 1, thereby cleaning the cementing wellhead automatic control device and completing the cementing construction.

Claims

1. An automatic control device for cementing wellhead, characterized in that It includes a cement head body, an upper bypass joint, a lower bypass joint, a bypass manifold, a valve ball, a gland, a rotating stop pin, a ball valve actuator, a stop pin actuator and an indicating remote transmission device. A grouting channel that runs through from top to bottom is arranged in the cement head body. An upper bypass joint that can be connected to the grouting channel is arranged on the right side of the upper part of the cement head body. A lower bypass joint that can be connected to the grouting channel is arranged on the right side of the lower part of the cement head body. A bypass manifold is fixedly connected between the right end of the upper bypass joint and the right end of the lower bypass joint. A valve ball is arranged in the cement head body corresponding to the position of the upper bypass joint. A main flow channel that runs through from top to bottom is arranged on the valve ball. A bypass flow channel that can be connected to the main flow channel is provided on the left side, a pressure cap is fixedly installed on the inner side of the upper end of the cement head body, an upper ball table groove that matches the upper part of the valve ball is provided on the inner side of the lower end of the pressure cap, a support ring platform is provided on the inner side of the cement head body corresponding to the outer position of the lower part of the valve ball, a lower ball table groove that matches the lower part of the valve ball is provided on the inner side of the upper end of the support ring platform, a ball valve actuator is provided on the front side of the cement head body corresponding to the front position of the valve ball, the ball valve actuator includes a valve stem and a first drive device, the front side of the valve ball is transmission-connected with the valve stem, and the front side of the cement head body is provided with a first drive device that can rotate the valve stem; corresponding to the upper bypass connection A stop pin cavity is provided on the inner side of the left part of the cement head body between the head and the lower bypass joint, and a rotating stop pin is provided in the grouting channel, and the left end of the rotating stop pin is hinged to the upper part of the stop pin cavity through a hinge shaft; the front end of the hinge shaft is located outside the cement head body, and a stop pin actuator is provided on the front side of the cement head body corresponding to the front position of the hinge shaft, and the stop pin actuator includes a locking block, a locking rod and a second driving device, a locking block is fixedly installed at the front end of the hinge shaft, a socket is provided on the locking block, a locking rod is provided in the socket, and a second driving device capable of moving the locking rod forward and backward is provided on the front side of the cement head body; the rear end of the hinge shaft is located outside the cement head body, and the locking rod is provided in the socket. The remote transmission device includes a magnetic positioning rotating sleeve, a magnetic induction identifier, a first magnetic block, a second magnetic block and a front-end communication module. The magnetic positioning rotating sleeve is fixedly installed on the outer side of the rear end of the articulated shaft. The first magnetic block and the second magnetic block are respectively arranged on the outer side of the rear end of the magnetic positioning rotating sleeve. A magnetic induction identifier that can perform magnetic induction identification with the first magnetic block and the second magnetic block respectively is arranged on the rear side of the cement head body corresponding to the upper position of the rear end of the magnetic positioning rotating sleeve; the magnetic induction identifier is connected to the front-end communication module, the front-end communication module is connected to the terminal control module, and the terminal control module is respectively connected to the first drive device and the second drive device.

2. The automatic control device for cementing wellhead according to claim 1 is characterized in that The first driving device includes a first reducer and a first motor. The output end of the first motor is connected to the input end of the first reducer, and the front end of the valve stem is connected to the output end of the first reducer.

3. The automatic control device for cementing wellhead according to claim 1 or 2, characterized in that The second driving device includes a second reducer, a second motor and a threaded sleeve. The output end of the second motor is connected to the input end of the second reducer. The threaded sleeve is transmission-connected to the output end of the second reducer. A locking rod is connected to the inner thread of the threaded sleeve.

4. The automatic control device for cementing wellhead according to claim 1 or 2, characterized in that It also includes an O-ring, an O-ring is provided between the inner side of the lower end of the pressure cover and the outer side of the upper part of the valve ball, an O-ring is provided between the inner side of the upper end of the support ring platform and the outer side of the lower part of the valve ball, at least one O-ring is provided between the pressure cover and the cement head body in the upper and lower intervals, and at least one O-ring is provided between the outer side of the middle part of the hinge shaft and the cement head body in the front and rear intervals.

5. The automatic control device for cementing wellhead according to claim 3 is characterized in that It also includes an O-ring, an O-ring is provided between the inner side of the lower end of the pressure cover and the outer side of the upper part of the valve ball, an O-ring is provided between the inner side of the upper end of the support ring platform and the outer side of the lower part of the valve ball, at least one O-ring is provided between the pressure cover and the cement head body in the upper and lower intervals, and at least one O-ring is provided between the outer side of the middle part of the hinge shaft and the cement head body in the front and rear intervals.

6. The automatic control device for cementing wellhead according to claim 1, 2 or 5, characterized in that It also includes a quick-release upper joint, a quick-release lower joint and a set screw. The quick-release upper joint is fixedly installed on the inner side of the lower end of the cement head body through a threaded connection, and the quick-release lower joint is fixedly installed on the outer side of the lower end of the quick-release upper joint; the outer side of the lower end of the cement head body is fixedly installed together with the quick-release upper joint through a set screw.

7. The automatic control device for cementing wellhead according to claim 3 is characterized in that It also includes a quick-release upper joint, a quick-release lower joint and a set screw. The quick-release upper joint is fixedly installed on the inner side of the lower end of the cement head body through a threaded connection, and the quick-release lower joint is fixedly installed on the outer side of the lower end of the quick-release upper joint; the outer side of the lower end of the cement head body is fixedly installed together with the quick-release upper joint through a set screw.

8. The automatic control device for cementing wellhead according to claim 4, characterized in that It also includes a quick-release upper joint, a quick-release lower joint and a set screw. The quick-release upper joint is fixedly installed on the inner side of the lower end of the cement head body through a threaded connection, and the quick-release lower joint is fixedly installed on the outer side of the lower end of the quick-release upper joint; the outer side of the lower end of the cement head body is fixedly installed together with the quick-release upper joint through a set screw.

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