Rubber plug indicator with grease injection function

Abstract

The rubber plug indicator with the grease injection function comprises an indication main body connected with a cement head body, the other end of the indication main body is sleeved with an end cover, inner cavities are formed in the ends, close to the indication main body, of the indication main body and the end cover correspondingly, and the inner cavities of the indication main body and the end cover are provided with a stop lever and a push rod correspondingly; the end, close to the stop lever, of the push rod penetrates through the supporting ring to be fixedly connected with the stop lever, a spring is arranged between the supporting ring and the stop lever, a magnetic induction switch is further installed on the side, away from the stop lever, of the push rod in the inner cavity of the end cover, and a grease injection valve is further connected to the end, away from the indication body, of the end cover. The grease injection valve is connected with an inner cavity of the end cover through a channel hole formed in the end cover, and a through hole I and a through hole II are formed in the corresponding positions of the supporting ring and the push rod respectively. The problems that in the prior art, cement enters a cavity of an indicator, the flexibility of the indicator is affected, and indication is inaccurate and even cannot be achieved are solved.

Description

Technical Field

[0001] The invention belongs to the technical field of petroleum cementing tools, and in particular relates to a rubber plug indicator with a grease injection function. Background Art

[0002] The cement head is a specialized high-pressure wellhead tool used to connect the casing string to the cementing equipment and complete cementing operations. The cement head facilitates operations such as circulation, spacer fluid injection, cement slurry injection, plug release, and slurry replacement. It serves as the central hub of the surface manifold and wellhead for cementing operations. Among the core components of the cement head, the plug indicator primarily determines whether the cementing plug has been pumped into the casing through the cement head assembly.

[0003] The integral high-pressure cement head plug indicator currently used by the well team is limited by application conditions and has unsatisfactory application effects. During use, cement can easily enter the indicator cavity and solidify inside the cavity, affecting the flexibility of the indicator's rotation, resulting in inaccurate indication or even no indication. Once the indicator is completely stuck, there is a risk of scratching the plug when it is forcibly pumped down the well, posing a huge hidden danger to cementing construction. In order to avoid the above safety hazards, the indicator assembly needs to be frequently disassembled for cleaning and maintenance, which is labor-intensive and affects the construction progress. Summary of the Invention

[0004] The purpose of the present invention is to provide a rubber plug indicator with a grease injection function, which solves the problem in the prior art that cement enters the indicator cavity, affects the flexibility of the indicator, and causes inaccurate indication or even no indication.

[0005] The technical solution adopted by the present invention is a rubber plug indicator with a grease injection function, comprising an indicating body connected to a cement head body, an end cover being sleeved on the other end of the indicating body, an inner cavity being provided on the indicating body and the end cover close to the indicating body, a stopper rod and a push rod being provided in the inner cavity of the indicating body and the end cover respectively, a support ring being provided in the inner cavity of the indicating body close to the end cover, an end of the push rod close to the stopper rod is fixedly connected to the stopper rod through the support ring, a grease inner cavity is formed between an end face of the support ring close to the indicating body, the surface of the inner cavity of the indicating body and the outer side faces of the stopper rod and the push rod, a spring is provided in the grease inner cavity, a magnetic induction switch is also installed in the inner cavity of the end cover on the side of the push rod away from the stopper rod, a grease injection valve is also connected to the end of the end cover away from the indicating body, the grease injection valve and the inner cavity of the end cover are connected by a channel hole provided on the end cover, the channel hole is connected to the inner hole of the grease injection valve, through hole I and through hole II are provided at corresponding positions of the support ring and the push rod respectively.

[0006] The present invention is characterized in that:

[0007] The magnetic induction switch includes a pin shaft, which is perpendicular to the axial center line of the end cover, and the distance between the center line of the pin shaft and the axial center line of the end cover is smaller than the radius of the inner cavity of the end cover at the pin shaft installation position. Both ends of the pin shaft pass through the end cover, and the pin shaft is rotatably connected to the end cover. The middle of the pin shaft is located in the inner cavity of the end cover on the side of the push rod away from the barrier rod. An inner fork is also connected to the middle position of the pin shaft, and the inner fork is located in the inner cavity of the end cover. The two ends of the pin shaft extending out of the end cover are respectively connected to an outer fork and an electric actuator, and the outer fork is rotatably connected to the pin shaft. A magnet is embedded in the end of the outer fork away from the pin shaft. A magnetic induction sensor is installed on the side wall of the end cover corresponding to the installation of the outer fork. The magnetic induction sensor is arranged corresponding to the magnet, and there are two sensing points of "open" and "close" on the magnetic induction sensor.

[0008] The inner shift fork is fixedly connected to the pin shaft, and the other end of the inner shift fork is hinged to an end surface of the push rod facing away from the blocking rod.

[0009] Seals IV and V are installed between the two ends of the pin shaft and the end cover respectively. A shaft retaining ring II is also provided at the end of the pin shaft connected to the outer fork away from the electric actuator. A shaft retaining ring II is also connected to the end of the pin shaft where the electric actuator is set.

[0010] The indicating body is a rotary structure, and is fixedly connected to the cement head body by a threaded connection. The connection between the indicating body and the end cover is also connected with a connecting nut, which connects the indicating body and the end cover together through a thread.

[0011] The central axis of the inner cavity of the indicating body and the central axis of the inner cavity of the end cover coincide with the central axis of rotation of the indicating body. The inner cavity of the indicating body passes through the indicating body. The end of the baffle rod close to the cement head body is set to be a hemisphere. The diameter of the hemisphere is the same as the diameter of the inner cavity of the indicating body close to the cement head body. A seal II is provided between the hemispherical end of the cement head body and the side wall of the inner cavity of the indicating body; a seal I is also installed between the cement head body and the indicating body; and a seal III is also installed on the contact surface of the indicating body and the end cover.

[0012] The baffle rod is a hemisphere with one end close to the cement head body, and the other end of the hemisphere is connected to a cylinder. The diameter of the cylinder is smaller than the diameter of the hemisphere. The spring is located between the hemisphere of the baffle rod and the support ring and is jointly sleeved on the baffle rod and the push rod at one end close to the cement head body.

[0013] One end of the blocking rod close to the push rod is provided with a protruding connector, and one end of the push rod close to the blocking rod is provided with a groove, and the protruding connector and the groove are fixedly connected by threads.

[0014] A locking ring is connected to the outer side wall of the indicating body through a thread, and the locking ring fixes the indicating body on the cement head body through the thread.

[0015] The grease injection valve is located in the end of the end cover away from the indicating body.

[0016] The beneficial effects of the present invention are:

[0017] (1) The head of the stopper rod adopts a spherical structure to prevent the rubber plug from being scratched and to allow the rubber plug to pass smoothly. A dynamic seal II is installed on the stopper rod to seal the internal pressure of the cavity while slowing down the cement from entering the indicator cavity.

[0018] (2) A grease injection valve is installed at the tail end of the end cover, through which grease can be injected into the inner cavity of the indicator. After the indicator has been used underground for a period of time, cement enters the inner cavity of the indicator and contaminates the grease, causing the internal damping to increase, resulting in the indicator being insensitive and the indication being inaccurate. After new grease is injected again through the grease injection valve, the new grease will push the contaminated grease out of the inner cavity of the indicator. At this time, the new grease fills the inner cavity of the indicator, which significantly improves the action sensitivity of the indicator, reduces the maintenance frequency, extends the service life of the indicator, and ensures the construction progress of the well team on site.

[0019] (3) The support ring and the push rod are connected by through holes, which allow the grease to enter the inner cavity of the indicator body quickly and evenly.

[0020] (4) When the plug passes through the internal channel of the cement head body and squeezes the indicator lever, the outer fork points to "open", and the magnetic induction sensor will feedback a signal that the plug is passing to the control system; when the plug passes the plug indicator, the outer fork points to "close", and the magnetic induction sensor will feedback a signal that the plug has passed to the control system; the on-site operator can use the outer fork indication to determine whether the plug inside the cement head has passed.

[0021] (5) The grease injection valve is installed inside the end cover. There is a through hole in the end cover that is connected to the inner hole of the grease injection valve. The length of the end cover covers the grease injection valve, which can protect the grease injection valve from external force collision and avoid damage to the grease injection valve.

[0022] (6) An electric actuator is installed at one end of the pin shaft. When the rubber plug continues to fall until the stopper lever is completely out of contact, the stopper lever and the push rod return to their initial positions together under the action of the spring rebound force. At this time, the pin shaft, with the help of the electric actuator, causes the inner and outer forks to rotate to their initial angles together, and finally causes the outer fork to point to "off". BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 This is a schematic diagram of the push rod outward movement structure of the rubber plug indicator with grease injection function of the present invention;

[0024] Figure 2 It is a structural schematic diagram of the middle stopper rod of the rubber plug indicator with grease injection function of the present invention moving inward;

[0025] Figure 3 yes Figure 1AA view;

[0026] Figure 4 This is a schematic diagram of the outer shift fork of the rubber plug indicator with grease injection function of the present invention being in the "open" position;

[0027] Figure 5 The present invention is a schematic diagram of a rubber plug indicator with a grease injection function in which the outer shift fork is located in the "off" position.

[0028] In the figure: 1. Cement head body, 2. Seal I, 3. Seal II, 4. Indicator body, 5. Spring, 6. Locking ring, 7. Stop rod, 8. Connecting nut, 9. Support ring, 10. Push rod, 11. Pin shaft, 12. Inner fork, 13. End cover, 1301. Channel hole, 14. Grease injection valve, 15. Grease, 16. Seal III, 17. Rubber plug, 18. Shaft retaining ring I, 19. Seal IV, 20. Seal V, 21. Shaft retaining ring II, 22. Outer fork, 2201. Magnet, 23. Electric actuator, 24. Magnetic induction sensor. DETAILED DESCRIPTION

[0029] The present invention will be described in detail below with reference to the accompanying drawings and specific embodiments.

[0030] Example 1

[0031] The present invention has a rubber plug indicator with a grease injection function, such as Figure 1-2 As shown, it includes an indicating body 4 connected to the cement head body 1, and the other end of the indicating body 4 is provided with an end cover 13. The indicating body 4 and the end cover 13 are both provided with an inner cavity near the end of the indicating body 4. The inner cavities of the indicating body 4 and the end cover 13 are respectively provided with a stopper 7 and a push rod 10. A support ring 9 is provided in the inner cavity near one end of the indicating body 4 near the end cover 13. The end of the push rod 10 near the stopper 7 passes through the support ring 9 and is fixedly connected to the stopper 7. The support ring 9 is close to an end surface of the indicating body 4, the surface of the inner cavity of the indicating body 4, and the stopper 7 and the push rod 1 0 forms a grease inner cavity, a spring 5 is arranged in the grease inner cavity, the inner cavity of the end cover 13 is located on the side of the push rod 10 away from the stop rod 7 and is also equipped with a magnetic induction switch, the end of the end cover 13 away from the indicating body 4 is also connected to a grease injection valve 14, the grease injection valve 14 and the inner cavity of the end cover 13 are connected by a channel hole 1301 provided on the end cover, the channel hole 1301 is connected to the inner hole of the grease injection valve, the length of the end cover covers the grease injection valve, and through hole I901 and through hole II1001 are respectively provided at the corresponding positions of the support ring 9 and the push rod 10.

[0032] like Figure 3-5As shown, the magnetic induction switch includes a pin shaft 11, which is perpendicular to the axial center line of the end cover 13, and the distance between the center line of the pin shaft 11 and the axial center line of the end cover 13 is smaller than the radius of the inner cavity of the end cover 13 at the installation position of the pin shaft 11. The radius of the end of the push rod 10 close to the grease injection valve is larger than the distance between the center line of the pin shaft 11 and the axial center line of the end cover 13. Both ends of the pin shaft 11 pass through the end cover 13, and the pin shaft 11 is rotatably connected to the end cover 13. The middle of the pin shaft 11 is located in the inner cavity of the end cover 13 on the side of the push rod 10 away from the blocking rod 7. An inner fork 12 is also connected to the middle position of the pin shaft 11, and the inner fork 12 is located in the inner cavity of the end cover 13. The two ends of the pin shaft 11 extending out of the end cover 13 are respectively connected to the outer fork 22 and the electric actuator 23. The outer fork 22 is rotatably connected to the pin shaft 11. The end of the outer fork 22 facing away from the pin shaft 11 is inlaid with a magnet 2201. A magnetic induction sensor 24 is installed on the side wall of the end cover 13 corresponding to the installation of the outer fork 22. The magnetic induction sensor 24 is set corresponding to the magnet 2201, and there are two sensing points of "open" and "close" on the magnetic induction sensor 24.

[0033] The inner fork 12 is fixedly connected to the pin 11, and the other end of the inner fork 12 is hinged to the end face of the push rod 10 away from the gear lever 7. The inner fork 12 and the outer fork 22 are fixed in the same position, and when the pin 11 drives the inner fork 12 to rotate, the outer fork 22 is also driven to rotate.

[0034] The indicating body 4 is a rotary structure, and is fixedly connected to the cement head body 1 by a threaded connection. The connection between the indicating body 4 and the end cover 13 is also connected with a connecting nut 8, which connects the indicating body 4 and the end cover 13 together through threads.

[0035] The central axis of the inner cavity of the indicating body 4 and the central axis of the inner cavity of the end cover 13 both coincide with the central axis of rotation of the indicating body 4. The inner cavity of the indicating body 4 passes through the indicating body 4. The end of the blocking rod 7 close to the cement head body 1 is set as a hemisphere, and the diameter of the hemisphere is the same as the diameter of the inner cavity of the indicating body 4 close to the cement head body 1.

[0036] The baffle rod 7 is a hemispherical body with one end close to the cement head body 1, and the other end of the hemisphere is connected to a cylinder. The diameter of the cylinder is smaller than the diameter of the hemisphere. The spring 5 is located between the hemisphere of the baffle rod 7 and the support ring 9 and is jointly sleeved on the baffle rod 7 and the push rod 10 at one end close to the cement head body 1.

[0037] One end of the blocking rod 7 close to the push rod 10 is provided with a protruding connector, and one end of the push rod 10 close to the blocking rod 7 is provided with a groove, and the protruding connector and the groove are fixedly connected by threads.

[0038] A locking ring 6 is connected to the outer wall of the indicating body 4 through a thread, and the locking ring 6 fixes the indicating body 4 to the cement head body 1 through the thread.

[0039] When the present invention is used, the operator injects grease 15 into the inner cavity of the indicating body 4 and the end cover 13 through the grease injection valve 14. There is a through hole I901 on the support ring 9 and a through hole II1001 on the push rod 10. The through holes I901 and II1001 can allow the grease to enter the grease inner cavity of the indicator faster and more evenly.

[0040] The magnetic induction sensor 24 is connected to a control system via a wire.

[0041] like Figure 1 As shown, when the plug 17 is passing through the internal channel of the cement head body 1, the blocking rod 7 moves outward due to the action of the plug 17 squeezing the blocking rod 7. The blocking rod 7 and the push rod 10 move outward together, and the spring 5 is compressed. Due to the limiting effect of the support ring 9 on the blocking rod 7 and the limiting effect of the pin 11 on the push rod 10, the blocking rod 7 pushes the spring 5 to a certain position and stops. At this time, the bottom of the push rod 10 pushes the inner fork 12 to a vertical state, as shown in FIG. Figure 4 As shown, it can be seen that when observing the indicator from the outside, the outer fork 22 points to "open". At this time, the "open" sensing point of the magnetic induction sensor 24 will sense the magnet 2201 at the front end of the outer fork 22. At the same time, the magnetic induction sensor 24 will feedback a signal that the plug 17 is passing to the control system.

[0042] like Figure 2 As shown, when the rubber plug 17 passes, the blocking rod 7 and the push rod 10 move together toward the inner cavity of the indicating body 4 under the rebound force of the spring 5. At this time, due to the limiting effect of the support ring 9, the blocking rod 7 and the push rod 10 stop when they reach a certain position. At this time, with the help of the electric actuator, the pin drives the inner and outer forks to rotate to a certain angle, so that the direction of the outer fork returns to the initial state: "off", as shown in FIG. Figure 5 As shown, it can be seen that the outer fork 22 of the indicator points to "off". At this time, the "off" sensing point of the magnetic induction sensor 24 will sense the magnet 2201 at the front end of the outer fork 22. At the same time, the magnetic induction sensor 24 will feedback a signal that the plug has passed to the control system.

[0043] The working principle of the present invention is as follows:

[0044] A rubber plug 17 is inserted into the internal channel of the cement head body 1. The rubber plug 17 slides down and passes through the stopper rod 7. The stopper 7 is squeezed by the rubber plug and drives the push rod 10 to move outward. The push rod 10 drives the inner fork 12 to rotate. The inner fork 12 simultaneously drives the pin shaft 11 and the outer fork 22 to rotate together, and finally the outer fork 22 points to "open". At this time, the control panel of the control system will display that the rubber plug is passing.

[0045] When the rubber plug continues to fall in the internal channel of the cement head body 1, and the rubber plug and the blocking rod 7 are completely out of contact, the blocking rod 7 and the push rod 10 return to their initial positions under the action of the rebound force of the spring 5. At this time, the pin shaft 11 drives the inner fork 12 and the outer fork 22 to rotate to a certain angle with the help of the electric actuator 23, and finally makes the outer fork 22 point to "off" again. At this time, the control panel of the control system will display that the rubber plug has passed.

[0046] Example 2

[0047] A seal II 3 is provided between one end of the hemispherical cement head body 1 and the side wall of the inner cavity of the indicating body 4; a seal I 2 is also installed between the cement head body 1 and the indicating body 4; a seal III 16 is also installed on the contact surface where the indicating body 4 and the end cover 13 are sleeved, and sealing grooves are provided at the corresponding positions of the seals II 3 and III 16 for installing sealing rings.

[0048] A seal II 3 is installed between the indicating body 4 and the stop rod 7 , and a seal III 16 is installed between the indicating body 4 and the stop rod 7 . The seal II 3 and the seal III 16 form a relatively closed cavity between the inner cavity of the indicating body and the inner cavity of the end cover.

[0049] Example 3

[0050] like Figure 3 As shown, seals IV 19 and V 20 are respectively installed between the two ends of the pin shaft 11 and the end cover 13 , and sealing grooves are provided at the corresponding positions of the seals IV 19 and V 20 for installing sealing rings.

[0051] The end of the pin shaft 11 connected to the outer fork 22 away from the electric actuator 23 is also provided with a shaft retaining ring II 21, and the end of the pin shaft 11 where the electric actuator 23 is provided is also connected to a shaft retaining ring II 18. The pin shaft 11 is fixed to the end cover 13 by the shaft retaining ring II 18 and the shaft retaining ring II 21.

[0052] Example 4

[0053] The grease injection valve 14 is located inside the end of the end cover away from the indicating body 4. The length of the end cover covers the grease injection valve, which can protect the grease injection valve from external force collision and avoid damage to the grease injection valve.

Claims

1. A rubber plug indicator with grease injection function, characterized in that: The utility model comprises an indicating body (4) connected to a cement head body (1), the other end of the indicating body (4) is provided with an end cover (13), the indicating body (4) and the end cover (13) are both provided with inner cavities at one end close to the indicating body (4), the inner cavities of the indicating body (4) and the end cover (13) are respectively provided with a blocking rod (7) and a push rod (10), the inner cavity of the indicating body (4) close to one end of the end cover (13) is provided with a support ring (9), the end of the push rod (10) close to the blocking rod (7) passes through the support ring (9) and is fixedly connected to the blocking rod (7), the support ring (9) is close to one end surface of the indicating body (4), the surface of the inner cavity of the indicating body (4) is provided with a support ring (9), and the support ring (9) is close to one end surface of the indicating body (4), and the surface of the inner cavity of the indicating body (4) is provided with a support ring (9). A grease inner cavity is formed between the outer side surfaces of the stop rod (7) and the push rod (10), and a spring (5) is arranged in the grease inner cavity. The inner cavity of the end cover (13) is located on the side of the push rod (10) away from the stop rod (7) and is also installed with a magnetic induction switch. The end of the end cover (13) away from the indicating body (4) is also connected to a grease injection valve (14). The grease injection valve (14) and the inner cavity of the end cover (13) are connected through a channel hole (1301) provided on the end cover. The channel hole (1301) is connected to the inner hole of the grease injection valve (14). The support ring (9) and the push rod (10) are respectively provided with a through hole I (901) and a through hole II (1001) at corresponding positions.

2. The rubber plug indicator with grease injection function according to claim 1, characterized in that: The magnetic induction switch includes a pin shaft (11), the pin shaft (11) is perpendicular to the axial center line of the end cover (13), and the distance between the center line of the pin shaft (11) and the axial center line of the end cover (13) is smaller than the radius of the inner cavity of the end cover (13) at the installation position of the pin shaft (11), both ends of the pin shaft (11) pass through the end cover (13), and the pin shaft (11) is rotatably connected to the end cover (13), the middle of the pin shaft (11) is located in the inner cavity of the end cover (13) on the side of the push rod (10) away from the blocking rod (7), and the middle position of the pin shaft (11) is also connected to the inner fork (12) The inner shift fork (12) is located in the inner cavity of the end cover (13); the two ends of the pin shaft (11) extending out of the end cover (13) are respectively connected to the outer shift fork (22) and the electric actuator (23); the outer shift fork (22) is fixedly connected to the pin shaft (11); the end of the outer shift fork (22) facing away from the pin shaft (11) is embedded with a magnet (2201); a magnetic induction sensor (24) is installed on a side wall of the end cover (13) corresponding to the installation of the outer shift fork (22); the magnetic induction sensor (24) is arranged corresponding to the magnet (2201); and the magnetic induction sensor (24) has two sensing points of "open" and "close".

3. The rubber plug indicator with grease injection function according to claim 2, characterized in that: The inner shift fork (12) is fixedly connected to the pin shaft (11), and the other end of the inner shift fork (12) is hinged to an end surface of the push rod (10) facing away from the blocking rod (7).

4. The rubber plug indicator with grease injection function according to claim 3, characterized in that: Seals IV (19) and seals V (20) are respectively installed between the two ends of the pin shaft (11) and the end cover (13). A shaft retaining ring II (21) is also provided at the end of the pin shaft (11) connected to the outer fork (22) away from the electric actuator (23). A shaft retaining ring II (18) is also connected to the end of the pin shaft (11) where the electric actuator (23) is provided.

5. The rubber plug indicator with grease injection function according to claim 1 or 3, characterized in that: The indicating body (4) is a rotary structure, and the indicating body (4) is fixedly connected to the cement head body (1) by means of a threaded connection. The connecting portion of the indicating body (4) and the end cover (13) is also connected to a connecting nut (8), and the connecting nut (8) connects the indicating body (4) and the end cover (13) together by means of a thread.

6. The rubber plug indicator with grease injection function according to claim 5, characterized in that: The central axis of the inner cavity of the indicating body (4) and the central axis of the inner cavity of the end cover (13) are both coincident with the central axis of rotation of the indicating body (4); the inner cavity of the indicating body (4) passes through the indicating body (4); the end of the blocking rod (7) close to the cement head body (1) is set as a hemisphere, and the diameter of the hemisphere is the same as the diameter of the inner cavity of the indicating body (4) close to the cement head body (1); a seal II (3) is set between the end of the cement head body (1) that is the hemisphere and the side wall of the inner cavity of the indicating body (4); a seal I (2) is also installed between the cement head body (1) and the indicating body (4); and a seal III (16) is also installed on the contact surface of the indicating body (4) and the end cover (13).

7. The rubber plug indicator with grease injection function according to claim 6, characterized in that: The blocking rod (7) is a hemispherical body, one end of which is close to the cement head body (1); the blocking rod (7) is a hemispherical body, and the other end is connected to a cylinder, the diameter of the cylinder is smaller than the diameter of the hemisphere; the spring (5) is located between the hemisphere of the blocking rod (7) and the support ring (9) and is jointly sleeved on the blocking rod (7) and the push rod (10) at one end close to the cement head body (1).

8. The rubber plug indicator with grease injection function according to claim 7, characterized in that: The end of the blocking rod (7) close to the push rod (10) is provided with a protruding connector, and the end of the push rod (10) close to the blocking rod (7) is provided with a groove, and the protruding connector and the groove are fixedly connected by a thread.

9. The rubber plug indicator with grease injection function according to claim 1, characterized in that: A locking ring (6) is connected to the outer wall of the indicating body (4) via a thread, and the locking ring (6) fixes the indicating body (4) to the cement head body (1) via a thread.

10. The rubber plug indicator with grease injection function according to claim 1, characterized in that: The grease injection valve (14) is located inside the end of the end cover (13) away from the indicating body (4).

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