Anti-clogging throttling control valve and method of use

Abstract

The application provides an anti-blocking throttling control valve and a use method, and relates to the technical field of valve equipment. The anti-blocking throttling control valve comprises a valve shell, a first flow channel and a second flow channel arranged on the valve shell, a valve core structure arranged on the valve shell, an inner hole flow channel of the valve core structure, the inner hole flow channel being controllably connected with the first flow channel and the second flow channel, and a dredging mechanism movably arranged in the valve shell, the dredging mechanism having a cleaning state of entering the inner hole flow channel and a storage state of exiting the inner hole flow channel. The dredging mechanism arranged on the anti-blocking throttling control valve can quickly remove the mud cake attached to the inner wall of the inner hole flow channel, avoids the problem that the mud cake blocks the throttling control valve, and does not need to disassemble the anti-blocking throttling control valve in the process of removing the mud cake, so that the cleaning efficiency is greatly improved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of valve equipment, in particular to a kind of anti-clogging throttling control valve and use method. BACKGROUND

[0002] In the process of oil exploitation, throttling valve needs to be used, one end of throttling valve is connected with the top port of wellbore, and the other end of throttling valve is connected with drilling fluid storage tank. Drilling fluid returned and discharged in wellbore can be discharged into drilling fluid storage tank under pressure through throttling valve. When it is needed to control well pressure, the opening degree of throttling valve is changed by rotating valve core, so as to adjust well pressure.

[0003] When throttling valve works for a long time, a layer of mud cake will gradually adhere to the inner wall of the inner hole of valve core. If the mud cake is not cleaned in time, the mud cake will gradually block the inner hole of valve core, thereby reducing the space of the inner hole of valve core, which is not conducive to the discharge of drilling fluid. In order to remove the mud cake, the existing technology adopts manual disassembly of the entire throttling valve, and then the mud cake in the inner hole of valve core is removed. Although the valve core can be dredged by disassembling the throttling valve to clean the mud cake, the process of disassembling the throttling valve is relatively cumbersome, and a lot of time is consumed. After the mud cake is cleaned, the throttling valve needs to be reassembled, which greatly increases the time for dredging the throttling valve, and the cleaning efficiency is low. SUMMARY

[0004] In order to overcome the above-mentioned defects of the prior art, the technical problem to be solved by the embodiments of the present application is to provide an anti-clogging throttling control valve and use method, for solving the problem of throttling valve blockage and improving the cleaning efficiency of throttling valve.

[0005] The above-mentioned purposes of the present application can be realized by the following technical scheme. The present application provides an anti-clogging throttling control valve, comprising:

[0006] A valve housing, a first flow channel and a second flow channel are arranged on the valve housing;

[0007] A valve core structure arranged in the valve housing, the valve core structure comprises an inner hole flow channel, the inner hole flow channel controllably communicates the first flow channel and the second flow channel; and

[0008] A dredging mechanism movably arranged in the valve housing, the dredging mechanism has a cleaning state of entering the inner hole flow channel and a storage state of withdrawing from the inner hole flow channel.

[0009] In a preferred embodiment of the present application, the valve core structure comprises a guide hole arranged in the valve housing, and a valve core, the first flow channel and the second flow channel are oppositely arranged at two sides of the guide hole and connected with the guide hole, the valve core is slidably arranged in the guide hole, and the valve core has the inner hole flow channel, which is connected with the first flow channel and the second flow channel in the cleaning state.

[0010] In a preferred embodiment of the present application, the valve core structure further comprises an adjusting oil cylinder arranged on the valve housing, a piston rod of the adjusting oil cylinder is connected with the valve core, and the adjusting oil cylinder can drive the valve core to slide along the guide hole.

[0011] In a preferred embodiment of the present application, the dredging mechanism comprises a first sliding groove arranged in the valve housing and a mud scraping structure, the first sliding groove is arranged along the radial direction of the first flow channel and connected with the first flow channel, and the mud scraping structure is slidably arranged in the first sliding groove; in the cleaning state, the mud scraping structure enters the first flow channel from the first sliding groove; and in the storage state, the mud scraping structure is withdrawn from the first flow channel to the first sliding groove.

[0012] In a preferred embodiment of the present application, the mud scraping structure comprises a casing slidably arranged in the first sliding groove and a scraper plate telescopically arranged in the casing, the casing has an opening facing the inner hole flow channel, and the scraper plate can enter the inner hole flow channel through the opening in the cleaning state.

[0013] In a preferred embodiment of the present application, the mud scraping structure further comprises a lifting oil cylinder arranged on the valve housing, the lifting oil cylinder is oppositely arranged at two sides of the casing relative to the first flow channel, a piston rod of the lifting oil cylinder is connected with the casing through a connecting piece, and the lifting oil cylinder can drive the casing to slide along the first sliding groove.

[0014] In a preferred embodiment of the present application, a plurality of raised digging teeth are arranged on the scraper plate.

[0015] In a preferred embodiment of the present application, a first feeding oil cylinder and a partition plate are arranged in the casing, the first feeding oil cylinder is oppositely arranged at two sides of the partition plate relative to the scraper plate, and a piston rod of the first feeding oil cylinder is connected with the scraper plate through the partition plate.

[0016] In a preferred embodiment of the present application, the mud scraping structure further comprises a push cylinder telescopically arranged in the casing, the push cylinder is sleeved on the outer side of the scraper plate, and the push cylinder can enter the inner hole flow channel through the opening in the cleaning state.

[0017] In a preferred embodiment of the present application, the outer diameter of the push cylinder is equal to the inner diameter of the inner hole flow channel, and in the cleaning state, the push cylinder is coaxially arranged with the inner hole flow channel.

[0018] In a preferred embodiment of the present application, the mud scraping structure further comprises at least one second feeding oil cylinder arranged in the casing, the second feeding oil cylinder is arranged on both sides of the partition plate opposite to the push cylinder, and the piston rod of the second feeding oil cylinder penetrates through the partition plate and connects with the push cylinder.

[0019] In a preferred embodiment of the present application, in the storage state, the outer wall of the casing is arranged on the inner wall of the first sliding groove, and a sealing structure is arranged between the outer wall of the casing and the inner wall of the first sliding groove.

[0020] In a preferred embodiment of the present application, the sealing structure comprises an annular sealing member embedded on the outer wall of the casing, and in the storage state, the casing is sealed and connected with the inner wall of the first sliding groove through the annular sealing member.

[0021] In a preferred embodiment of the present application, the valve housing comprises a valve body and a valve cover detachably arranged on the valve body, and the adjusting oil cylinder and the lifting oil cylinder are arranged on the valve cover.

[0022] In a preferred embodiment of the present application, the anti-clogging throttling control valve further comprises an oil pipe wire passing structure, and the oil pipe wire passing structure comprises a first wire passing hole arranged on the casing and a second wire passing hole arranged on the valve cover.

[0023] In a preferred embodiment of the present application, the unblocking mechanism is provided with two groups, one group of the unblocking mechanism is arranged on one side of the valve core structure corresponding to the first flow channel, and the other group of the unblocking mechanism is arranged on the other side of the valve core structure corresponding to the second flow channel.

[0024] In a preferred embodiment of the present application, the first flow channel comprises a liquid inlet hole arranged in the valve housing and a first stop valve connected with the liquid inlet hole, and the second flow channel comprises a liquid outlet hole arranged in the valve housing and a second stop valve connected with the liquid outlet hole, and the liquid inlet hole and the liquid outlet hole are arranged along the same axial direction.

[0025] The present application also provides a use method of the anti-clogging throttling control valve, comprising the following steps:

[0026] Opening the anti-clogging throttling control valve to connect the wellbore with the drilling fluid storage tank;

[0027] Controlling the opening degree of the inner hole flow channel through the valve core structure to adjust the well pressure to a set value;

[0028] When the mud cake attached to the inner hole flow channel exceeds a set value, the communication between the anti-clogging throttle control valve and the wellbore and the drilling fluid tank is disconnected, and the dredging mechanism is started to clean the inner hole flow channel;

[0029] When the cleaning operation is completed, the dredging mechanism is reset, and then the anti-clogging throttle control valve is reopened.

[0030] In a preferred embodiment of the present application, in the step of disconnecting the communication between the anti-clogging throttle control valve and the wellbore and the drilling fluid tank when the mud cake attached to the inner hole flow channel exceeds a set value, and starting the dredging mechanism to clean the inner hole flow channel, the specific steps include:

[0031] The first and second shut-off valves are closed;

[0032] The inner hole flow channel is brought to maximum opening by controlling the stroke of the piston rod of the adjusting oil cylinder to drive the valve core to move along the guide hole;

[0033] The housing is brought into the liquid inlet hole and / or the liquid outlet hole by the lifting oil cylinder;

[0034] The scraper is pushed into the inner hole flow channel by the first feeding oil cylinder, and the outer edge of the mud cake is scraped off by the spade teeth on the scraper, and then the first feeding oil cylinder drives the scraper to retreat to the housing;

[0035] The push cylinder is pushed into the inner hole flow channel by the second feeding oil cylinder, and the remaining mud cake on the inner wall of the inner hole flow channel is scraped off by the movement of the push cylinder adhering to the inner wall of the inner hole flow channel, and then the second feeding oil cylinder drives the push cylinder to retreat to the housing.

[0036] The technical scheme of the present application has the following remarkable beneficial effects:

[0037] When the anti-clogging throttle control valve is used, the first flow channel is connected in communication with the top port of the wellbore, and the second flow channel is connected in communication with the drilling fluid tank, and the drilling fluid returned and discharged in the wellbore passes through the top port of the wellbore, the first flow channel, the inner hole flow channel, and the second flow channel in sequence under the action of pressure, and finally flows into the drilling fluid tank.

[0038] When the inner hole flow channel is used for a long time, a large amount of mud cake will be attached to the inner wall of the inner hole flow channel. At this time, the communication between the anti-clogging throttle control valve and the wellbore and the drilling fluid tank is disconnected, and the dredging mechanism can be used to clean the mud cake on the inner wall of the inner hole flow channel.

[0039] When the cleaning is completed, the dredging mechanism can be reset to avoid affecting the normal use of the anti-clogging throttle control valve, and then the communication between the anti-clogging throttle control valve and the wellbore and the drilling fluid tank is restored.

[0040] The present application can quickly remove the mud cake adhered to the inner wall of the inner hole flow channel by the dredging mechanism arranged on the anti-blocking throttle control valve, and avoids the problem of mud cake blocking the throttle control valve. In the process of removing the mud cake, the anti-blocking throttle control valve does not need to be disassembled, and the cleaning efficiency is greatly improved.

[0041] Specifically, in the process of removing the mud cake, the outer edge of the mud cake is scraped off by the shovel teeth on the scraper, and then the remaining mud cake on the inner wall of the inner hole flow channel is scraped off by the movement of the push cylinder in contact with the inner wall of the inner hole flow channel. The mud cake adhered to the inner wall of the inner hole flow channel can be gradually removed by the cooperation of the scraper and the push cylinder, and the cleaning effect is improved. BRIEF DESCRIPTION OF DRAWINGS

[0042] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings needed to be used in the embodiment description will be briefly introduced as follows. Obviously, the drawings in the following description are only some embodiments of the present application, and other drawings can be obtained by those skilled in the art without any creative effort on the basis of these drawings.

[0043] The drawings described herein are for illustrative purposes only, and are not intended to limit the scope of the present application in any way. In addition, the shapes and scale sizes of the components in the drawings are only illustrative, and are used to help understand the present application, and are not specific limitations on the shapes and scale sizes of the components of the present application. Those skilled in the art can select various possible shapes and scale sizes to implement the present application according to specific circumstances under the guidance of the present application.

[0044] Figure 1 A side view structural schematic diagram of the anti-blocking throttle control valve;

[0045] Figure 2 A top view structural schematic diagram of the anti-blocking throttle control valve;

[0046] Figure 3 A side view sectional view structural schematic diagram of the anti-blocking throttle control valve;

[0047] Figure 4 A Figure 3 A local enlarged schematic diagram at A in the middle;

[0048] Figure 5 A front view structural schematic diagram of the scraper;

[0049] Figure 6 A side view structural schematic diagram of the scraper;

[0050] Figure 7 A structural schematic diagram of the dredging mechanism in a cleaning state;

[0051] Figure 8 Structure diagram of cleaning operation for the push cylinder

[0052] Figure 9 Structure diagram of cleaning operation for the push cylinder

[0053] Reference signs of the above drawings:

[0054] 100, valve housing; 1, valve body; 2, valve cover; 3, guide hole; 4, first flow passage; 5, second flow passage; 600, valve core structure; 6, valve core; 7, inner hole flow passage; 8, adjusting oil cylinder; 9, dredging mechanism; 10, lifting oil cylinder; 11, first sliding groove; 12, connecting piece; 13, machine housing; 14, opening; 15, partition plate; 16, first feeding oil cylinder; 17, scraper; 18, toothed shovel; 19, second feeding oil cylinder; 20, push cylinder; 211, first stop valve; 212, second stop valve; 22, mounting bracket; 23, guide sleeve; 24, first wire passing hole; 25, second wire passing hole; 26, annular sealing element. DETAILED DESCRIPTION

[0055] The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative work fall within the scope of protection of the present application.

[0056] Embodiment one

[0057] Please refer to Figure 1 , Figure 2 and Figure 3 , in the embodiments of the present application, a kind of anti-clogging throttling control valve is provided, including: valve housing 100, first flow passage 4 and second flow passage 5 are arranged on valve housing 100;Valve core structure 600 is arranged in valve housing 100, and valve core structure 600 includes inner hole flow passage 7, and inner hole flow passage 7 is controllably connected with first flow passage 4 and second flow passage 5;And dredging mechanism 9, dredging mechanism 9 is movably arranged in valve housing 100, and dredging mechanism 9 has the cleaning state of entering inner hole flow passage 7 and the storage state of withdrawing from inner hole flow passage 7.

[0058] Overall, when the anti-clogging throttling control valve is used, first flow passage 4 is connected with the top port of wellbore (not shown), second flow passage 5 is connected with drilling fluid storage tank (not shown), and drilling fluid returned and discharged in wellbore flows under pressure through the top port of wellbore, first flow passage 4, inner hole flow passage 7 and second flow passage 5 in sequence, and finally flows into drilling fluid storage tank.

[0059] When the inner hole flow channel 7 is used for a long time, a large amount of mud cake will be attached to the inner wall of the inner hole flow channel 7. At this time, the communication between the anti-blocking throttle control valve and the wellbore and the drilling fluid tank is disconnected, and the mud cake on the inner wall of the inner hole flow channel 7 can be cleaned by using the dredging mechanism 9. When the cleaning is completed, the dredging mechanism 9 can be reset to avoid affecting the normal use of the anti-blocking throttle control valve, and then the communication between the anti-blocking throttle control valve and the wellbore and the drilling fluid tank is restored.

[0060] By using the dredging mechanism 9, the mud cake attached to the inner wall of the inner hole flow channel 7 can be quickly removed, avoiding the problem of mud cake blocking the throttle control valve, and in the process of removing the mud cake, the anti-blocking throttle control valve does not need to be disassembled, greatly improving the cleaning efficiency.

[0061] In the embodiment of the present application, as shown in the embodiment, Figure 3 the valve core structure 600 includes a guide hole 3 arranged in the valve housing 100 and a valve core 6, the first flow channel 4 and the second flow channel 5 are arranged on the two sides of the guide hole 3 and are connected with the guide hole 3, and the valve core 6 is slidably arranged in the guide hole 3. The valve core 6 has an inner hole flow channel 7, and in the cleaning state, the inner hole flow channel 7 communicates the first flow channel 4 and the second flow channel 5.

[0062] Specifically, the first flow channel 4 and the second flow channel 5 are arranged along the same axial direction, and the guide hole 3 is arranged along the radial direction of the first flow channel 4 and the second flow channel 5. The guide hole 3 is connected with the first flow channel 4 and the second flow channel 5, and the valve core 6 is arranged between the first flow channel 4 and the second flow channel 5 through the guide hole 3, which is used to play the role of switching and flow regulation.

[0063] By slidably arranging the valve core 6 in the guide hole 3, adjusting the relative position of the valve core 6 in the guide hole 3 can drive the inner hole flow channel 7 to be staggered with the first flow channel 4 and the second flow channel 5 along the radial direction, thereby controlling the opening size of the inner hole flow channel 7 to realize the role of adjusting well pressure and flow.

[0064] In the embodiment of the present application, the valve core structure 600 further includes an adjusting oil cylinder 8 arranged on the valve housing 100, the piston rod of the adjusting oil cylinder 8 is connected with the valve core 6, and the adjusting oil cylinder 8 can drive the valve core 6 to slide along the guide hole 3.

[0065] Specifically, the adjusting oil cylinder 8 can be connected with an external hydraulic control system to drive the valve core 6 to move. In another embodiment, a gas cylinder or a driving slider can be used instead of the adjusting oil cylinder 8, which is not limited here.

[0066] Further, a guide sleeve 23 is arranged in the guide hole 3, the guide sleeve 23 is perpendicular to the axial direction of the first flow channel 4 and the second flow channel 5, and the piston rod of the adjusting oil cylinder 8 passes through the guide sleeve 23 and is connected with the valve core 6. The guide sleeve 23 can improve the movement stability of the piston rod of the adjusting oil cylinder 8, accurately control the movement stroke of the valve core 6, and more accurately control the opening degree of the inner hole flow channel 7.

[0067] In the embodiment of the present application, as shown in the embodiment, Figure 3 and Figure 4 the dredging mechanism 9 comprises a first sliding groove 11 arranged in the valve housing 100 and a mud scraping structure, the first sliding groove 11 is arranged along the radial direction of the first flow channel 4 and connected with the first flow channel 4, and the mud scraping structure is slidably arranged in the first sliding groove 11; in the cleaning state, the mud scraping structure enters the first flow channel 4 from the first sliding groove 11; in the storage state, the mud scraping structure is withdrawn from the first flow channel 4 to the first sliding groove 11.

[0068] Specifically, the first sliding groove 11 is arranged along the radial direction of the first flow channel 4, and the first sliding groove 11 is connected with the first flow channel 4. In the embodiment, the cross section of the first sliding groove 11 is square, and the machine shell 13 is arranged in the first sliding groove 11, and the outer wall of the machine shell 13 is attached to the inner wall of the first sliding groove 11. In other embodiments, the cross section of the first sliding groove 11 can also be arranged in other shapes, which is not limited here.

[0069] In the cleaning state, the mud scraping structure can enter the first flow channel 4 along the first sliding groove 11 and clean the mud cake attached to the inner wall of the inner hole flow channel 7.

[0070] In the embodiment of the present application, as shown in the embodiment, Figure 4 the mud scraping structure comprises a machine shell 13 slidably arranged in the first sliding groove 11 and a scraper 17 telescopically arranged in the machine shell 13, the machine shell 13 has an opening 14 facing the inner hole flow channel 7, and in the cleaning state, the scraper 17 can enter the inner hole flow channel 7 through the opening 14.

[0071] Specifically, in the cleaning state, the opening 14 can face one end of the inner hole flow channel 7, and the scraper 17 can move along the axial direction of the inner hole flow channel 7, so that when the scraper 17 enters the inner hole flow channel 7, the scraper 17 can remove the mud cake attached to the inner wall of the inner hole flow channel 7.

[0072] In the embodiment of the present application, as shown in the embodiment, Figure 7 and Figure 8In the embodiment shown, the mud scraping structure further comprises a lifting cylinder 10 arranged on the valve housing 100, the lifting cylinder 10 is arranged on both sides of the machine housing 13 opposite to the first flow channel 4, the piston rod of the lifting cylinder 10 is connected to the machine housing 13 through a connecting piece 12, and the lifting cylinder 10 can drive the machine housing 13 to slide along the first sliding groove 11.

[0073] Specifically, the lifting cylinder 10 can be connected to an external hydraulic control system to drive the scraper 17 to move. The connecting piece 12 comprises a connecting rod, one end of the connecting rod is connected to the piston rod of the lifting cylinder 10, and the other end of the connecting rod is connected to the machine housing 13. The length of the piston rod of the lifting cylinder 10 can be extended through the connecting piece 12, which facilitates the connection of the piston rod of the lifting cylinder 10 to the machine housing 13 to control the movement stroke of the machine housing 13.

[0074] In another embodiment, a gas cylinder or a driving slider can be used instead of the lifting cylinder 10, which is not limited here.

[0075] In the embodiment of the present application, as shown in Figure 5 and Figure 6 In the embodiment shown, a plurality of raised cutting teeth 18 are arranged on the scraper 17.

[0076] Specifically, a plurality of cutting teeth 18 are arranged on the scraper 17. The cutting teeth 18 improve the scraping effect of the mud cake attached to the inner wall of the inner hole flow channel 7 and improve the cleaning efficiency. The designer can determine the shape of the cutting teeth 18 according to the need for scraping the mud cake, for example, the cutting teeth 18 are arranged in the shape of teeth, which is not limited here.

[0077] In the embodiment of the present application, as shown in Figure 4 In the embodiment shown, a first feeding cylinder 16 and a partition plate 15 are arranged in the machine housing 13, the first feeding cylinder 16 is arranged on both sides of the partition plate 15 opposite to the scraper 17, and the piston rod of the first feeding cylinder 16 penetrates through the partition plate 15 and is connected to the scraper 17.

[0078] Specifically, the partition plate 15 is fixedly arranged in the machine housing 13 to divide the machine housing 13 into two inner cavities, the first feeding cylinder 16 is arranged in one of the inner cavities to isolate the drilling fluid, and the scraper 17 is movably arranged in the other inner cavity.

[0079] The first feeding cylinder 16 can push the scraper 17 into the inner hole flow channel 7 for cleaning work. Further, the first feeding cylinder 16 drives the scraper 17 to make reciprocating motion in the inner hole flow channel 7, which can quickly remove the mud cake attached to the inner hole flow channel 7 and improve the cleaning efficiency.

[0080] During the operation of the scraper 17, there is a gap between the outer wall of the scraper 17 and the inner wall of the inner hole flow channel 7, and mud cake is easily left in the gap.

[0081] In order to thoroughly remove the mud cake, in the embodiment of the present application, as shown in the embodiment of Figure 4 and Figure 9 the application, the mud scraping structure further comprises a pushing cylinder 20 telescopically arranged in the casing 13, the pushing cylinder 20 is sleeved on the outer side of the scraper 17, and in the cleaning state, the pushing cylinder 20 can enter the inner hole flow channel 7 through the opening 14.

[0082] By sleeving the pushing cylinder 20 on the outer side of the scraper 17, the pushing cylinder 20 can remove the mud cake between the scraper 17 and the inner wall of the inner hole flow channel 7, thereby improving the cleaning effect.

[0083] Specifically, in the embodiment, the outer diameter of the pushing cylinder 20 is equal to the inner diameter of the inner hole flow channel 7, and in the cleaning state, the pushing cylinder 20 is coaxially arranged with the inner hole flow channel 7.

[0084] Since the outer diameter of the pushing cylinder 20 is equal to the inner diameter of the inner hole flow channel 7, when the pushing cylinder 20 is pushed into the inner hole flow channel 7, the pushing cylinder 20 can move in close contact with the inner wall of the inner hole flow channel 7, thereby completely removing the mud cake attached to the inner wall of the inner hole flow channel 7, and significantly improving the cleaning effect.

[0085] In the embodiment of the present application, the mud scraping structure further comprises at least one second feeding oil cylinder 19 arranged in the casing 13, the second feeding oil cylinder 19 is arranged on both sides of the partition plate 15 opposite to the pushing cylinder 20, and the piston rod of the second feeding oil cylinder 19 penetrates the partition plate 15 and is connected with the pushing cylinder 20.

[0086] Specifically, the second feeding oil cylinder 19 and the first feeding oil cylinder 16 are arranged in the same inner cavity to isolate the drilling fluid, and the pushing cylinder 20 is movably arranged in another inner cavity. The pushing cylinder 20 can be pushed into the inner hole flow channel 7 for cleaning operation by the second feeding oil cylinder 19.

[0087] Further, the pushing cylinder 20 can be driven by the second feeding oil cylinder 19 to make reciprocating motion in the inner hole flow channel 7, which can quickly remove the mud cake attached to the inner hole flow channel 7, thereby improving the cleaning efficiency.

[0088] In the embodiment of the present application, in the storage state, the outer wall of the casing 13 is arranged in close contact with the inner wall of the first sliding groove 11, and a sealing structure is arranged between the outer wall of the casing 13 and the inner wall of the first sliding groove 11.

[0089] The sealing structure can seal the outer wall of the casing 13 and the inner wall of the first sliding groove 11, prevent the drilling fluid from entering the first sliding groove 11 and leaking, and improve the safety in use.

[0090] In the embodiment of the present application, as shown in Figure 4In the shown embodiment, the sealing structure comprises a ring-shaped sealing element 26 embedded on the outer wall of the casing 13, and in the storage state, the casing 13 is sealedly connected with the inner wall of the first chute 11 through the ring-shaped sealing element 26.

[0091] Specifically, the ring-shaped sealing element 26 is a dynamic sealing ring, which is embedded on the outer wall of the bottom of the casing 13. When the casing 13 enters into the first chute 11 in the storage state, the casing 13 is sealed with the inner wall of the first chute 11 through the dynamic sealing ring, so that the leakage of the drilling fluid from the gap between the first chute 11 and the casing 13 during the normal use of the anti-clogging throttling control valve can be avoided.

[0092] In the embodiment of the present application, as shown in Figure 3 In the shown embodiment, the valve housing 100 comprises a valve body 1 and a valve cover 2 detachably arranged on the valve body 1, and the adjusting oil cylinder 8 and the lifting oil cylinder 10 are arranged on the valve cover 2.

[0093] By detaching the valve cover 2, the components located in the valve body 1 can be conveniently overhauled. Specifically, in the present embodiment, the valve cover 2 is detachably connected with the valve body 1 through a bolt structure.

[0094] In another embodiment, the designer can also use other detachable structures to connect the valve body 1 and the valve cover 2, such as a clamping structure, which is not limited herein.

[0095] Further, the valve body 1 is provided with a mounting bracket 22, through which the valve body 1 can be fixedly installed at a designated position, thereby improving the stability of the valve housing 100 during the working process.

[0096] In the embodiment of the present application, as shown in Figure 3 and Figure 4 In the shown embodiment, the anti-clogging throttling control valve further comprises a tubing passing structure, which comprises a first passing hole 24 arranged on the casing 13 and a second passing hole 25 arranged on the valve cover 2.

[0097] Through the first passing hole 24 and the second passing hole 25, the hydraulic oil pipe can enter into the valve body 1 to communicate with the first feeding oil cylinder 16 and the second feeding oil cylinder 19, thereby avoiding affecting the normal use of the first feeding oil cylinder 16 and the second feeding oil cylinder 19.

[0098] In the embodiment of the present application, the unblocking mechanism 9 is provided with two groups, one group of the unblocking mechanism 9 corresponding to the first flow channel 4 is arranged on one side of the valve core structure 600, and the other group of the unblocking mechanism 9 corresponding to the second flow channel 5 is arranged on the other side of the valve core structure 600.

[0099] Specifically, the two groups of dredging mechanisms 9 are symmetrically arranged on both sides of the valve core structure 600. When the mud removal operation is performed, the two groups of dredging mechanisms 9 can work alternately to remove the mud cake in the inner hole flow channel 7. Of course, the two groups of dredging mechanisms 9 can also work independently to remove the mud cake in the inner hole flow channel 7, which is not limited here.

[0100] By arranging the two groups of dredging mechanisms 9, the two groups of dredging mechanisms 9 can perform the mud removal operation from both sides of the inner hole flow channel 7, which significantly improves the cleaning effect of the mud cake.

[0101] In the embodiment of the present application, the first flow channel 4 includes a liquid inlet hole arranged in the valve housing 100 and a first stop valve 211 connected to the liquid inlet hole, and the second flow channel 5 includes a liquid outlet hole arranged in the valve housing 100 and a second stop valve 212 connected to the liquid outlet hole. The liquid inlet hole and the liquid outlet hole are arranged along the same axial direction.

[0102] By closing the first stop valve 211 and the second stop valve 212, the communication between the anti-clogging throttling control valve and the wellbore and the drilling fluid tank is disconnected, at which time the dredging mechanism 9 can be used to clean the inner hole flow channel 7, thereby avoiding the influence of the drilling fluid on the cleaning operation. When the cleaning operation is completed, the dredging mechanism 9 is reset, and then the first stop valve 211 and the second stop valve 212 are opened, so that the anti-clogging throttling control valve communicates the wellbore and the drilling fluid tank, and returns to the normal working state.

[0103] Embodiment two

[0104] In the embodiment of the present application, a use method of the anti-clogging throttling control valve is also provided, which includes the following steps:

[0105] Step 101: opening the anti-clogging throttling control valve to communicate the wellbore and the drilling fluid tank;

[0106] Step 102: adjusting the well pressure to a set value by controlling the opening of the inner hole flow channel 7 through the valve core structure 600;

[0107] Step 103: when the mud cake attached to the inner hole flow channel 7 exceeds the set value, disconnecting the communication between the anti-clogging throttling control valve and the wellbore and the drilling fluid tank, and starting the dredging mechanism 9 to clean the inner hole flow channel 7;

[0108] Step 104: when the cleaning operation is completed, resetting the dredging mechanism 9, and then reopening the anti-clogging throttling control valve.

[0109] The designer can determine the set value of the mud cake according to the actual use experience, which is not limited here. By adjusting the well pressure to a set value through the valve core structure 600, the anti-clogging throttling control valve can be in a stable working state, which has better use effect.

[0110] Of course, the designer can also set the working time of the anti-clogging throttle control valve, and when the set time is reached, the cleaning mechanism 9 is started to clean the inner hole flow channel 7.

[0111] In the embodiment of the present application, the step of opening the anti-clogging throttle control valve to communicate the wellbore and the drilling fluid tank includes the following steps:

[0112] Step 1011: Open the first stop valve 211 to communicate the top port of the wellbore, and open the second stop valve 212 to communicate the drilling fluid tank. At this time, the drilling fluid returned from the wellbore flows under pressure through the top port of the wellbore, the first stop valve 211, the first flow channel 4, the inner hole flow channel 7, the second flow channel 5, and the second stop valve 212, and finally flows into the drilling fluid tank.

[0113] In the embodiment of the present application, the step of adjusting the well pressure to a set value by controlling the opening of the inner hole flow channel 7 through the valve core structure 600 includes the following steps:

[0114] Step 1021: By controlling the stroke of the piston rod of the adjusting oil cylinder 8, the valve core 6 is driven to move along the guide hole 3, so that the valve core 6 is staggered with the inlet hole and the outlet hole in the radial direction to change the opening size of the inner hole flow channel 7, thereby adjusting the well pressure to a set value.

[0115] In the embodiment of the present application, when the mud cake attached to the inner hole flow channel 7 exceeds a set value, the communication between the anti-clogging throttle control valve and the wellbore and the drilling fluid tank is disconnected, and the cleaning mechanism 9 is started to clean the inner hole flow channel 7. The specific steps include the following steps:

[0116] Step 1031: Close the first and second stop valves;

[0117] Step 1032: By controlling the stroke of the piston rod of the adjusting oil cylinder 8, the valve core 6 is driven to move along the guide hole 3 so that the inner hole flow channel 7 is at maximum opening;

[0118] Step 1033: The housing 13 is driven into the first flow channel 4 and / or the second flow channel 5 by the lifting oil cylinder 10;

[0119] Step 1034: The scraper 17 is pushed into the inner hole flow channel 7 by the first feeding oil cylinder 16, and the outer edge of the mud cake is scraped off by the spade teeth 18 on the scraper 17. Then the first feeding oil cylinder 16 drives the scraper 17 to retreat to the housing 13;

[0120] Step 1035: The push cylinder 20 is pushed into the inner hole flow channel 7 by the second feeding oil cylinder 19, and the remaining mud cake on the inner wall of the inner hole flow channel 7 is scraped off by the push cylinder 20 adhering to the inner wall of the inner hole flow channel 7. Then the second feeding oil cylinder 19 drives the push cylinder 20 to retreat to the housing 13.

[0121] In the embodiment of the present application, when the cleaning operation is completed, the unclogging mechanism 9 is reset, and then the anti-blocking throttle control valve is re-opened, which specifically includes the following steps:

[0122] Step 1041: The housing 13 is driven back into the first sliding groove 11 by the lifting oil cylinder 10, the first stop valve 211 and the second stop valve 212 are opened, the anti-blocking throttle control valve is connected to the wellbore and the drilling fluid storage tank, and the normal working state is restored.

[0123] All articles and references disclosed, including patent applications and publications, are incorporated herein by reference for all purposes. The term "consisting essentially of to describe combinations shall include the elements, ingredients, components or steps identified, and such other elements ingredients, components or steps that do not materially affect the basic and novel characteristics of the combination. The use of the term "comprising" or "including" to describe combinations of elements, ingredients, components or steps herein also is taken to mean that other elements, ingredients, components or steps that do not materially affect the basic and novel characteristics of the combinations are optionally present. The use of the term "or" in the embodiments herein is meant to be inclusive in a logical sense, and the use of the language "comprising" to describe one embodiment of a combination also indicates that other embodiments of the combination can also be described using the same or similar language. The use of the term "can" in the embodiments herein is intended to convey that a described attribute of any of the described implementations is optional. Multiple elements, ingredients, components or steps can be provided by a single integrated element, ingredient, component or step. Alternatively, a single integrated element, ingredient, component or step might be divided into separate multiple elements, ingredients, components or steps. To "comprise" or "include" an element or list of elements is meant when used in describing certain embodiments to specify the presence of that element or those elements but does not exclude the presence of one or more additional elements that are not expressly listed.

[0124] The various embodiments in the specification are described in a progressive manner, and each embodiment focuses on the difference from other embodiments. The same and similar parts between the various embodiments can be referred to each other. The above embodiments are only for illustrating the technical concept and characteristics of the present application, and the purpose is to enable those skilled in the art to understand the content of the present application and implement it, and it cannot limit the protection scope of the present application. Any equivalent changes or modifications made according to the spirit and principle of the present application shall be covered within the protection scope of the present application.

Claims

1. An anti-clogging throttling control valve characterized by, include: A valve housing (100) is provided with a first flow channel (4) and a second flow channel (5); A valve core structure (600) is disposed within the valve housing (100). The valve core structure (600) includes an inner flow channel (7), a guide hole (3) disposed within the valve housing (100), a valve core (6), and an adjusting cylinder (8) disposed on the valve housing (100). The first flow channel (4) and the second flow channel (5) are disposed opposite to each other on both sides of the guide hole (3) and are connected to the guide hole (3). The valve core (6) is slidably disposed in the guide hole (3). The valve core (6) has the inner flow channel (7), which connects the first flow channel (4) and the second flow channel (5). The piston rod of the adjusting cylinder (8) is connected to the valve core (6), and the adjusting cylinder (8) can drive the valve core (6) to slide along the guide hole (3). A dredging mechanism (9) is movably disposed within the valve housing (100). The dredging mechanism (9) has a clean state of entering the inner channel (7) and a retracted state of exiting the inner channel (7). The dredging mechanism (9) includes a first slide groove (11) disposed within the valve housing (100) and a sludge scraping structure. The first slide groove (11) is arranged radially along the first channel (4) and connected to the first channel (4). The sludge scraping structure is slidably disposed within the first slide groove (11). In the clean state, the sludge scraping structure enters the first channel (4) from the first slide groove (11). In the retracted state, the sludge scraping structure retracts from the first channel (4) back into the first slide groove (11). The sludge scraping structure includes a housing (13) slidably disposed in the first chute (11) and a scraper (17) retractably disposed in the housing (13). The housing (13) has an opening (14) facing the inner channel (7). In the cleaning state, the scraper (17) can enter the inner channel (7) through the opening (14).

2. The anti-clogging throttling control valve of claim 1, wherein The sludge scraping structure also includes a lifting cylinder (10) disposed on the valve housing (100). The lifting cylinder (10) is disposed opposite to the first flow channel (4) on both sides of the housing (13). The piston rod of the lifting cylinder (10) is connected to the housing (13) through a connector (12). The lifting cylinder (10) can drive the housing (13) to slide along the first slide groove (11).

3. The anti-clogging throttling control valve of claim 2, wherein The scraper (17) is provided with a ring of protruding shovel teeth (18).

4. The anti-clogging throttling control valve of claim 3, wherein The housing (13) is provided with a first feed cylinder (16) and a partition (15). The first feed cylinder (16) and the scraper (17) are arranged opposite to each other on both sides of the partition (15). The piston rod of the first feed cylinder (16) passes through the partition (15) and connects with the scraper (17).

5. The anti-clogging throttling control valve of claim 4, wherein The sludge scraping structure also includes a push cylinder (20) that is retractably disposed within the housing (13). The push cylinder (20) is sleeved on the outside of the scraper (17). In the cleaning state, the push cylinder (20) can enter the inner flow channel (7) through the opening (14).

6. The anti-clogging throttling control valve as described in claim 5, characterized in that, The outer diameter of the push cylinder (20) is equal to the inner diameter of the inner channel (7). In the clean state, the push cylinder (20) and the inner channel (7) are coaxially arranged.

7. The anti-clogging throttling control valve as described in claim 6, characterized in that, The sludge scraping structure also includes at least one second feed cylinder (19) disposed in the housing (13). The second feed cylinder (19) is disposed opposite to the push cylinder (20) on both sides of the partition (15). The piston rod of the second feed cylinder (19) passes through the partition (15) and connects with the push cylinder (20).

8. The anti-clogging throttling control valve as described in claim 1, characterized in that, In the stored state, the outer wall of the housing (13) is fitted to the inner wall of the first slide groove (11), and a sealing structure is provided between the outer wall of the housing (13) and the inner wall of the first slide groove (11).

9. The anti-clogging throttling control valve as described in claim 8, characterized in that, The sealing structure includes an annular seal (26) embedded in the outer wall of the housing (13). In the stored state, the housing (13) is sealed to the inner wall of the first groove (11) through the annular seal (26).

10. The anti-clogging throttling control valve as described in claim 2, characterized in that, The valve housing (100) includes a valve body (1) and a valve cover (2) detachably disposed on the valve body (1). The regulating cylinder (8) and the lifting cylinder (10) are both disposed on the valve cover (2).

11. The anti-clogging throttling control valve as described in claim 10, characterized in that, The anti-clogging throttling control valve also includes an oil pipe passing structure, which includes a first passing hole (24) provided on the housing (13) and a second passing hole (25) provided on the valve cover (2).

12. The anti-clogging throttling control valve as described in any one of claims 1 to 11, characterized in that, The unblocking mechanism (9) is provided in two sets. One set of the unblocking mechanism (9) is located on one side of the valve core structure (600) corresponding to the first flow channel (4), and the other set of the unblocking mechanism (9) is located on the other side of the valve core structure (600) corresponding to the second flow channel (5).

13. The anti-clogging throttling control valve as described in claim 12, characterized in that, The first flow channel (4) includes an inlet hole disposed in the valve housing (100) and a first shut-off valve (211) connected to the inlet hole. The second flow channel (5) includes an outlet hole disposed in the valve housing (100) and a second shut-off valve (212) connected to the outlet hole. The inlet hole and the outlet hole are arranged along the same axial direction.

14. A method of using the anti-clogging throttling control valve as described in claim 7, characterized in that, Includes the following steps: Open the anti-clogging throttling control valve to connect the wellbore and the drilling fluid storage tank; The opening degree of the inner flow channel (7) is controlled by the valve core structure (600) to adjust the well pressure to the set value; When the mud cake attached to the inner channel (7) exceeds the set value, the first shut-off valve and the second shut-off valve are closed, and the dredging mechanism (9) is started to clean the inner channel (7). By controlling the stroke of the piston rod of the regulating cylinder (8), the valve core (6) is driven to move along the guide hole (3) so that the inner hole flow channel (7) is at its maximum opening. The lifting cylinder (10) drives the housing (13) into the inlet and / or outlet. The first feed cylinder (16) pushes the scraper (17) into the inner flow channel (7), and the scraper teeth (18) on the scraper (17) scrape off the outer edge of the mud cake. Then the first feed cylinder (16) drives the scraper (17) back to the housing (13). The second feed cylinder (19) pushes the pusher (20) into the inner hole flow channel (7). The pusher (20) moves against the inner wall of the inner hole flow channel (7) to remove the remaining mud cake on the inner wall of the inner hole flow channel (7). Then the second feed cylinder (19) drives the pusher (20) back to the machine housing (13). After the cleaning operation is completed, reset the unblocking mechanism (9) and then reopen the anti-clogging throttling control valve.

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