A rotary blowout preventer rubber core blowout preventer system and method

Abstract

The present invention relates to a blowout prevention system and method for a rotary blowout preventer rubber core, and to the technical field of underbalanced drilling and pressure-controlled drilling equipment in the drilling industry; it includes a sealing rubber core, on which a protective sleeve is provided; a rotary blowout preventer rubber core blowout prevention system is provided on the basis of the sealing rubber core, including a rotary blowout preventer, the rotary blowout preventer includes a shell and a top cover, a monitoring unit is provided in the shell, and a protective unit is provided at the bottom of the sealing rubber core. In the present invention, the monitoring unit can monitor the sealing rubber core, and when the sealing rubber core is subjected to greater wear during operation, it will issue an early warning reminder before it is unable to start sealing around the drilling tool, and at the same time, it will prompt that the sealing rubber core needs to be replaced; secondly, the protective unit can wipe the surface of the drilling tool to reduce particles on the surface of the drilling tool, thereby further delaying the wear time of the sealing rubber core and indirectly increasing its service life.

Description

Technical Field

[0001] The invention relates to the technical field of underbalanced drilling and managed pressure drilling equipment in the drilling industry, and in particular to a rotary blowout preventer rubber core blowout preventer system and method. Background Art

[0002] Rotary BOP is a special wellhead control device used for special operations such as underbalanced drilling, geothermal drilling and coalbed methane drilling. Its main function is to seal the annular space between the drill string and the wellhead device, and allow the drill bit to rotate under limited wellhead pressure conditions, thereby achieving pressure drilling operations.

[0003] The rotary BOP is usually composed of a shell, a rubber core, a rotary assembly, a square bushing, etc. Among them, the rubber core of the rotary BOP is a key sealing component in underbalanced drilling and pressure operation, and its performance directly affects safe production.

[0004] For example, the Chinese patent with publication number CN116146137A discloses that the present invention belongs to the technical field of underbalanced drilling and pressure-controlled drilling equipment in the oil drilling industry, and specifically relates to a controllable automatic compensating rotary blowout preventer rubber core, system and method. The controllable automatic compensating rotary blowout preventer rubber core is organically composed of an outer shell, an inner rubber part, a hydraulic connecting rod, a piston and a cover plate. On the basis of the controllable automatic compensating rotary blowout preventer rubber core, a rotary blowout preventer, a controller and a high-pressure oil input mechanism are added to form a controllable automatic compensating rotary blowout preventer system. Using the principle of hydraulic axial pushing of the piston and radial contraction of the piston, a controllable automatic compensating rotary blowout preventer rubber core with a variable inner hole is designed to actively adjust the clamping force between the rubber core and the drilling tool.

[0005] However, the above rotary blowout preventer still has some shortcomings in actual use:

[0006] 1. First, in the above-mentioned prior art, the active and controllable sealing of the drill bit by the controllable automatic compensating rotary BOP rubber core with variable inner hole prolongs the service life of the rubber core and reduces the replacement frequency of the rubber core; however, the rotary BOP rubber core is always a vulnerable part. With the friction between the rotary BOP rubber core and the drill bit, a large amount of debris will be generated in the rotary BOP rubber core. If the debris is not protected in time, the debris will enter the hydraulic system, causing the hydraulic system to be blocked and damaged.

[0007] 2. Secondly, in the prior art, the rotary blowout preventer is usually assembled by the combination of bolts and nuts. However, the core component of the rotary blowout preventer rubber core is a wearing part, so the entire rotary blowout preventer needs regular maintenance and disassembly. The installation method of the existing rotary blowout preventer is relatively complicated, so the steps of its disassembly and maintenance are relatively cumbersome, which indirectly affects the efficiency of the entire drilling tool.

[0008] 3. Then, the existing technology cannot detect the degree of wear of the rubber core in the rotary blowout preventer, which often leads to severe wear of the rubber core and inability to control the pressure during drilling operation.

[0009] Therefore, under the above-stated viewpoints, the existing rotary blowout preventers still have room for improvement. Summary of the invention

[0010] In order to solve the above problems, the present invention provides a rotary blowout preventer rubber core blowout preventer system and method, which adopts the following technical solutions:

[0011] In a first aspect, a rotary blowout preventer rubber core blowout preventer system includes a sealing rubber core, wherein the sealing rubber core is integrated by two inner rubber parts of a truncated cone structure symmetrically distributed along the height direction, the middle part of the sealing rubber core is a hollow structure to form a working chamber, and the working chamber is for drilling tools to pass through, and the sealing rubber core is provided with a plurality of horizontally distributed installation grooves at equal intervals along the circumferential direction of the axis; and protective ferrules for limiting the sealing rubber core are inserted and installed in the plurality of installation grooves of the sealing rubber core.

[0012] It also includes a rotary blowout preventer, which includes a shell and a top cover. The top cover is arranged on the shell, and a monitoring part for monitoring the thickness of two inner rubber parts of the sealing rubber core is arranged in the shell.

[0013] The monitoring part includes a plurality of monitoring grooves formed on the protective ferrules, a monitoring frame is inserted into the monitoring grooves of the protective ferrules, an electrode sheet is provided at one end of the monitoring frame close to the protective ferrule, two wires extend outward from the electrode sheet, an early warning device is commonly installed at one end of the two wires away from the electrode sheet, and the early warning device is installed at one end of the monitoring frame away from the protective ferrule.

[0014] A protective portion is also provided at the bottom of the sealant core.

[0015] Preferably, the monitoring frame is also provided with an adjusting member for adjusting its position, and the adjusting member includes an adjusting screw which is rotatable through a bearing and arranged in a monitoring groove in the protective sleeve, and an adjusting block is threadedly connected to the adjusting screw, and the adjusting block is connected to the monitoring frame.

[0016] Preferably, the protective part includes a collecting ring resting against the bottom of the sealing rubber core, and a plurality of groups of connecting ropes are arranged at equal intervals in the circumferential direction of the outer wall of the collecting ring. The connecting ropes extend outward along the height direction of the protective sleeve and slide through the protective sleeve. The end of the connecting rope away from the collecting ring is connected to a collecting plate, and a pre-tensioning spring is arranged between the collecting plate and the protective sleeve, and the pre-tensioning spring is sleeved on the connecting rope.

[0017] Preferably, the collecting ring is provided with a collecting groove for collecting debris falling off after friction of the sealant core, and the inner wall and the outer wall of the collecting ring are provided with high temperature resistant collecting cotton for collecting the debris.

[0018] Preferably, a movable piston is slidably arranged in the housing along its height direction, a limiting ring is arranged at the bottom of the movable piston to limit its movement, and the housing is also provided with two oil inlets at different heights along the height direction.

[0019] Preferably, a self-installation component for quick installation and disassembly is also provided between the top cover and the shell, and the self-installation component includes mounting tooth plates arranged at equal intervals on the bottom of the top cover and a card slot opened on the top of the shell, the mounting tooth plate of the top cover is inserted into the card slot of the shell, and the card slot of the shell is also provided with a card frame, a mounting card plate extending toward the card slot is slidably provided in the card frame, and a card spring is provided between the mounting card plate and the card frame.

[0020] A linkage rope is connected to the back side of the mounting card plate, and a pressing block is arranged at one end of the linkage rope away from the mounting card plate. The pressing block is slidably arranged on the clamping frame, and a movable groove for the pressing block to move is arranged on the clamping frame.

[0021] Preferably, both the mounting tooth plate and the mounting clamping plate are provided with a rack structure, and the mounting tooth plate and the rack structure on the mounting clamping plate are matched in one direction.

[0022] In a second aspect, the present application also provides a method for preventing blowout of a rotary blowout preventer rubber core, and the method for preventing blowout of a rotary blowout preventer rubber core is as follows:

[0023] S1. Installation: The drilling tool is inserted into the casing, the top cover and the inside of the casing, and then it is lowered into the well by a crane until the drilling tool and the rotary blowout preventer are moved to the designated position in the well;

[0024] S2. Drilling operation: Control the rotation of the drill bit to operate the oil well. At the same time, the inner rubber part of the sealant core works to control the wellhead pressure to avoid blowout.

[0025] S3, monitoring operation: when the drilling tool is working, the monitoring part on the limit block monitors the sealant core in the shell, and issues an early warning when the inner rubber part of the sealant core is damaged, and at the same time prompts that the inner rubber part of the sealant core needs to be replaced;

[0026] S4. Collection operation: When the sealant core needs to be replaced, the drilling tool stops operating, the drilling tool and the rotary blowout preventer are taken out by a crane, the rotary blowout preventer is disassembled, and the new inner rubber parts are replaced. At the same time, the friction between the drilling tool and the sealant core will cause the inner rubber parts of the sealant core to produce debris, which is protected by the protection part. At the same time, when replacing the inner rubber parts of the sealant core, the fallen debris is collected.

[0027] In summary, the present application includes at least one of the following beneficial technical effects:

[0028] 1. The sealant core of the present invention has strong wear resistance, thereby effectively increasing its service life, reducing the frequency of replacing the sealant core, further improving the use efficiency of the rotary blowout preventer, and indirectly improving the efficiency of drilling tool processing.

[0029] 2. The monitoring unit of the present invention can monitor the sealant core and issue an early warning reminder when the sealant core is severely worn during operation, causing it to be unable to start sealing around the drill bit. At the same time, it reminds the sealant core to be replaced to avoid complete damage to the sealant core and failure of the sealing.

[0030] 3. The sealant core of the present invention will still be worn as the drill tool rotates synchronously during the sealing operation. As the wear gradually increases, some debris will be generated, which can be effectively collected by the protective part. At the same time, the protective part can also wipe the surface of the drill tool to reduce the particles on the surface of the drill tool, thereby further delaying the wear time of the sealant core and indirectly increasing its service life.

[0031] Fourth, the self-installing assembly in the present invention can realize quick installation and disassembly between the top cover and the shell, thereby indirectly improving the efficiency of replacing the sealant core of the rotary blowout preventer each time and ensuring the continuity of the drilling tool operation. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] The present invention is further described below in conjunction with the accompanying drawings and embodiments.

[0033] Figure 1 It is a schematic diagram of the main structure of the present invention.

[0034] Figure 2 It is a structural schematic diagram of the sealing rubber core of the present invention.

[0035] Figure 3 It is a structural explosion diagram of the sealing rubber core of the present invention from a first perspective.

[0036] Figure 4 It is a structural explosion diagram of the sealant core of the present invention from a second viewing angle.

[0037] Figure 5 It is a structural schematic diagram of the rotary blowout preventer of the present invention.

[0038] Figure 6 It is a schematic diagram of the structure of the monitoring unit of the present invention.

[0039] Figure 7 It is a schematic diagram of the structure between the monitoring part and the protection part of the present invention.

[0040] Figure 8 It is a schematic diagram of the structure between the monitoring part and the regulating part of the present invention.

[0041] Fig. 9 It is a partial structural schematic diagram of the movable piston, the limit ring and the oil inlet of the present invention.

[0042] Fig.10 It is a schematic structural diagram of the self-installation component of the present invention from a first perspective.

[0043] Fig.11 It is a schematic structural diagram of the self-installing component of the present invention from a second viewing angle.

[0044] Fig.12 It is a schematic diagram of the structure between the mounting tooth plate and the mounting clamping plate of the present invention.

[0045] Fig.13 The present invention is a flow chart of a blowout prevention method for a rubber core of a rotary blowout preventer.

[0046] Explanation of the reference numerals: 1. Sealing rubber core; 10. Inner rubber part; 2. Drilling tool; 11. Mounting groove; 3. Protective sleeve; 12. Limiting block; 13. Limiting groove; 14. Strip groove; 4. Rotary blowout preventer; 40. Shell; 41. Top cover; 42. Monitoring unit; 420. Monitoring frame; 421. Electrode sheet; 422. Early warning device; 5. Protective unit; 43. Adjusting member; 430. Adjusting screw; 431. Adjusting block; 50. Collecting ring; 51. Connecting rope; 52. Collecting plate; 53. Pre-tensioning spring; 44. Moving piston; 45. Limiting ring; 46. Oil inlet; 6. Self-installing assembly; 60. Slot; 61. Installing tooth plate; 62. Snap-on frame; 63. Installing card plate; 67. Snap-on compression spring; 64. Linkage rope; 65. Pressing block; 66. Movable groove. DETAILED DESCRIPTION

[0047] The following is combined with Figure 1-Figure 13 This application is described in further detail.

[0048] The embodiment of the present application discloses a rotary blowout preventer rubber core blowout prevention system and method; it is described that it is mainly used in the technical field of underbalanced drilling and pressure-controlled drilling equipment in the drilling industry, and in terms of technical effect can prevent the debris generated by friction between the sealing rubber core 1 and the drilling tool 2 from entering the hydraulic system and causing damage to it.

[0049] Secondly, in the prior art, the rotary blowout preventer 4 is usually assembled by the combination of bolts and nuts, but its core component, the sealing rubber core 1, is a wearing part, so the entire rotary blowout preventer 4 needs to be regularly repaired and disassembled. The installation method of the existing rotary blowout preventer 4 is relatively complicated, so the steps of its disassembly and maintenance are relatively cumbersome, which indirectly affects the working efficiency of the entire drilling tool 2.

[0050] Then, the prior art cannot detect the degree of wear of the sealing rubber core 1 in the rotary blowout preventer 4, which often leads to severe wear of the rubber core and inability to control the pressure of the drilling tool 2 during operation.

[0051] Embodiment 1:

[0052] The present application also proposes a rotary blowout preventer rubber core blowout prevention system, which involves a sealing rubber core 1, which has a strong heat dissipation capability, and the sealing rubber core 1 of the present application is integrated by two truncated cone-shaped inner rubber parts 10, which has strong wear resistance.

[0053] Reference Figure 2 , Figure 3 and Figure 4 As shown, a rotary blowout preventer rubber core includes a sealing rubber core 1, wherein: the sealing rubber core 1 is integrated by two inner rubber parts 10 of a truncated cone structure symmetrically distributed along the height direction, the middle part of the sealing rubber core 1 is a hollow structure to form a working cavity, the working cavity is for the drilling tool 2 to pass through, and the sealing rubber core 1 is provided with a plurality of horizontally distributed installation grooves 11 at equal intervals along the circumferential direction of the axis.

[0054] The sealant core 1 is formed by integrating two inner rubber parts 10 of a truncated cone structure. Therefore, the integral groove of the sealant core 1 can effectively ensure its sealing performance when it is working. At the same time, the wear resistance of the sealant core 1 is greatly improved by being formed by two inner rubber parts 10.

[0055] The several installation grooves 11 of the sealant core 1 are all inserted with protective sleeves 3 for limiting the sealant core 1. The protective sleeve 3 is also integrated with a limiting block 12. The installation grooves 11 of the sealant core 1 are also integrated with limiting grooves 13 for the limiting block 12 to engage.

[0056] The protective ferrule 3 is snap-fitted into the limiting groove 13 of the sealing rubber core 1 to ensure that the protective ferrule 3 can fit tightly against the sealing rubber core 1. When the sealing rubber core 1 fits against the surface of the drill tool 2, it rotates synchronously with the drill tool 2 as the drill tool 2 rotates. However, as it rotates, a certain amount of heat is generated between it and the external shell 40 due to friction. At this time, the heat can be effectively conducted through the protective ferrule 3 to avoid heat accumulation in the sealing rubber core 1. As the entire drill tool 2 continues to work, the temperature of the sealing rubber core 1 will continue to accumulate and gradually increase, which may cause the high-temperature resistant sealing rubber core 1 to fail to maintain its optimal performance.

[0057] The protective sleeve 3 proposed in the present application can solve the above-mentioned problem well, and the heat can be quickly transferred through the protective sleeve 3 to achieve the purpose of heat dissipation.

[0058] A limiting block 12 is provided on the protective sleeve 3, and the limiting block 12 is inserted into the limiting groove 13 of the sealing rubber core 1. When the drill 2 rotates, the sealing rubber core 1 can be limited by the cooperation between the protective sleeve 3 and the limiting block 12, so that the protective sleeve 3 and the sealing rubber core 1 are integrated.

[0059] Look again Figure 2 , Figure 3 and Figure 4 The figure is a schematic diagram of the structure of the sealant core 1; the sealant core 1 has a plurality of strip grooves 14 evenly spaced on both sides along the height direction, so that the two ends of the sealant core 1 can be deformed under the action of external force and form an interference fit with the drilling tool 2.

[0060] The upper and lower ends of the sealant core 1 are provided with strip grooves 14 to facilitate the deformation of the sealant core 1 under external force, ensuring that the sealant core 1 fits more closely to the surface of the drilling tool 2. Meanwhile, the strip grooves 14 are also conducive to heat dissipation.

[0061] Embodiment 2:

[0062] On the basis of the first embodiment, in order to further improve the performance of the sealing rubber core 1, the application further proposes a rotary blowout preventer rubber core blowout prevention system.

[0063] Reference Figure 5 As shown, the rotary blowout preventer 4 includes a shell 40 and a top cover 41 . The top cover 41 is arranged on the shell 40 , and a monitoring part 42 for monitoring the thickness of the two inner rubber parts 10 of the sealing rubber core 1 is arranged in the shell 40 .

[0064] The shell 40 and the top cover 41 are assembled with each other. The monitoring part 42 in the shell 40 mainly detects the thickness of the sealant core 1. If the thickness of the sealant core 1 is continuously reduced due to wear, an alarm is issued before the thickness cannot control the pressure in the well, and then the sealant core 1 is replaced.

[0065] See also Figure 6 and Figure 7 As shown, the monitoring part 42 includes a plurality of monitoring grooves formed on the protective ferrule 3, a monitoring frame 420 is inserted into the monitoring groove of the protective ferrule 3, an electrode sheet 421 is provided at one end of the monitoring frame 420 close to the protective ferrule 3, two wires extend outward from the electrode sheet 421, an early warning device 422 is installed at one end of the two wires away from the electrode sheet 421, and the early warning device 422 is installed at one end of the monitoring frame 420 away from the protective ferrule 3.

[0066] The electrode sheet 421 is arranged in the protective sleeve 3, and the electrode sheet 421 is close to the working cavity of the sealant core 1, and the drill bit 2 is inserted into the working cavity. When the drill bit 2 rotates and moves at the same time, the soil particles adhered to the surface of the drill bit 2 will act on the sealant core 1. As the drill bit 2 works, the working cavity area of ​​the sealant core 1 will gradually be worn. As the wear increases, the sealant core 1 gradually becomes thinner.

[0067] After the sealant core 1 is worn to expose the electrode sheet 421, the electrode sheet 421 will contact the drill tool 2. The electrode sheet 421 is in a weak power circuit. When the electrode sheet 421 contacts external metal material, the circuit where the electrode sheet 421 is located will short-circuit. At this time, the early warning device 422 starts to work and performs alarm processing. At the same time, the staff who control the drill tool 2 stops working after receiving the alarm command and prepares for subsequent maintenance operations.

[0068] The monitoring unit 42 can effectively monitor the sealant core 1 in real time. When the sealant core 1 is worn to a specified degree, it can be maintained and replaced in the shortest possible time to avoid the sealant core 1 being excessively worn and unable to control the pressure inside the oil well, resulting in a blowout of the material inside the oil well.

[0069] The bottom of the sealant core 1 is also provided with a protective part 5. The protective part 5 can block impurities adhering to the surface of the drill 2 during its rotation, and can also collect debris generated by the wear of the sealant core 1.

[0070] Reference Figure 8 As shown, that is, a schematic diagram of the structure for adjusting the detection sensitivity of the electrode sheet 421 in the present application; specifically, the monitoring frame 420 is also provided with an adjusting member 43 for adjusting its position, and the adjusting member 43 includes an adjusting screw 430 which is rotatable through a bearing and arranged in a monitoring groove in the protective sleeve 3, and an adjusting block 431 is screwed on the adjusting screw 430, and the adjusting block 431 is connected to the monitoring frame 420.

[0071] The adjusting screw 430 is rotated, and the adjusting screw 430 can control the monitoring frame 420 to move along the monitoring groove of the protective ferrule 3 through the adjusting block 431. If the distance between the electrode sheet 421 and the working cavity of the sealant core 1 gradually approaches, it means that the sensitivity of the electrode sheet 421 is high; if the distance between the electrode sheet 421 and the working cavity of the sealant core 1 gradually moves away, it means that the sensitivity of the electrode sheet 421 is low.

[0072] See picture for review Figure 7 and Figure 8As shown, it is a schematic diagram of the structure of the protection part 5 in the present application; the protection part 5 includes a collecting ring 50 resting on the bottom of the sealant core 1, and a plurality of groups of connecting ropes 51 are arranged at equal intervals on the circumferential direction of the outer wall of the collecting ring 50, and the connecting ropes 51 extend outward along the height direction of the protective sleeve 3 and slide through the protective sleeve 3, and the end of the connecting rope 51 away from the collecting ring 50 is connected to a collecting plate 52, and a pre-tensioning spring 53 is arranged between the collecting plate 52 and the protective sleeve 3, and the pre-tensioning spring 53 is sleeved on the connecting rope 51.

[0073] It should be noted that the collecting ring 50 can always abut against the bottom of the sealant core 1 through the cooperation of the connecting rope 51 and the pre-tension spring 53, thereby improving the ability of the collecting ring 50 to collect debris and impurities.

[0074] The connecting rope 51 is passed through the protective ferrule 3, and the collecting ring 50 can be limited by the connecting rope 51 to ensure that the collecting ring 50 and the protective ferrule 3 can fit on the outside of the sealing rubber core 1, which can not only transfer the heat during friction but also limit the sealing rubber core 1.

[0075] The collecting ring 50 is provided with a collecting groove for collecting debris falling off after friction of the sealant core 1, and the inner wall and the outer wall of the collecting ring 50 are provided with high temperature resistant collecting cotton for collecting the debris.

[0076] It should be noted that the high-temperature resistant collecting cotton has a porous structure. The high-temperature resistant collecting cotton on the inner side of the collecting ring 50 is attached to the surface of the drill tool 2. The high-temperature resistant collecting cotton on the inner side of the collecting ring 50 can be used to preliminarily clean the soil particles adhering to the surface of the drill tool 2 to prevent too many soil particles from entering the working cavity of the sealant core 1, causing the sealant core 1 to wear too quickly. At the same time, the debris generated by wear in the working cavity of the sealant core 1 can also be collected, and the debris falls into the porous structure of the high-temperature resistant collecting cotton, thereby improving the efficiency of debris collection and preventing the debris from being dispersed too widely.

[0077] The high temperature resistant collecting cotton on the outside of the collecting ring 50 is attached to the movable piston 44 and can collect the debris generated by the wear of the outer wall of the sealing rubber core 1 .

[0078] See also Fig. 9 As shown, it is a schematic diagram of the structure in which the sealing rubber core 1 seals the drilling tool 2 to prevent blowout; a movable piston 44 is also slidably arranged in the housing 40 along its height direction, and a limiting ring 45 is arranged at the bottom of the movable piston 44 to limit its movement, and the housing 40 is also provided with two oil inlets 46 at different heights along the height direction.

[0079] It should be noted that a limiting ring 45 is disposed at the bottom of the inner wall of the housing 40, the movable piston 44 is slidably disposed on the limiting ring 45, and the two oil inlets 46 on the housing 40 are connected to an external device known for conveying pressurized oil in an initial state.

[0080] During the specific implementation, two oil inlets 46 at different heights are provided on the housing 40. For the convenience of description, the higher oil inlet 46 of the housing 40 is named as the first oil inlet, and the lower oil inlet 46 of the housing 40 is named as the second oil inlet.

[0081] When the drill tool 2 is ready to rotate, oil is delivered to the second oil port in the shell 40. At this time, under the higher pressure of the oil, the movable piston 44 is pushed to move upward along the inner wall of the shell 40. In this process, the movable piston 44 squeezes the two inner rubber parts 10 of the sealing rubber core 1, so that the sealing rubber core 1 gradually approaches the lamp. The sealing rubber core 1 is tightly fitted to the outer wall of the drill tool 2 through interference fit. When the drill tool 2 rotates, the entire sealing rubber core 1 and the protective sleeve 3 rotate synchronously.

[0082] When the drilling tool 2 completes the operation, it stops supplying oil to the second oil port of the shell 40 and supplies oil to the first oil port of the shell 40. At this time, the pressure of the oil applies downward pressure to the movable piston 44, causing the movable piston 44 to move away from the sealing rubber core 1. At this time, the sealing rubber core 1 loses the external force and is only sleeved on the outer wall of the drilling tool 2.

[0083] Embodiment three:

[0084] Reference Fig.10 , Fig.11 and Fig.12 As shown, on the basis of the second embodiment, in order to further ensure the stability and efficiency of the rotary blowout preventer 4, the present application further proposes a self-installation assembly 6, through which the top cover 41 and the shell 40 can be quickly installed and disassembled. In the prior art, the top cover 41 and the shell 40 are assembled and locked by a plurality of bolts and nuts. When disassembling them, the plurality of bolts and nuts need to be separated one by one before the top cover 41 and the shell 40 can be separated. The self-installation assembly 6 of the present application can realize the rapid disassembly and installation between the two, thereby indirectly improving the efficiency of replacing the sealant core 1 of the rotary blowout preventer 4 each time.

[0085] See also Fig.10 and Fig.11As shown, a self-installation component 6 for quick installation and disassembly is also provided between the top cover 41 and the shell 40. The self-installation component 6 includes mounting tooth plates 61 evenly spaced at the bottom of the top cover 41 and a card slot 60 opened at the top of the shell 40. The mounting tooth plate 61 of the top cover 41 is inserted into the card slot 60 of the shell 40, and the card slot 60 of the shell 40 is also provided with a card frame 62. A mounting card plate 63 extending toward the card slot 60 is slidably provided in the card frame 62, and a card spring 67 is provided between the mounting card plate 63 and the card frame 62.

[0086] A linkage rope 64 is connected to the back side of the mounting card plate 63 , and a pressing block 65 is provided at one end of the linkage rope 64 away from the mounting card plate 63 . The pressing block 65 is slidably arranged on the clamping frame 62 , and a movable slot 66 for the pressing block 65 to move is provided on the clamping frame 62 .

[0087] The mounting tooth plate 61 and the mounting clamping plate 63 are both provided with a rack structure, and the mounting tooth plate 61 and the rack structure on the mounting clamping plate 63 are matched in one direction, see Fig.12 shown.

[0088] It should be noted that, in the initial state, the mounting clamping plate 63 extends into the clamping slot 60 of the housing 40 under the action of the elastic force of the clamping compression spring 67 .

[0089] The mounting tooth plate 61 and the rack structure on the mounting card plate 63 cooperate unidirectionally, that is, the mounting tooth plate 61 can move downward along the mounting card plate 63, and after the mounting tooth plate 61 is engaged with the mounting card plate 63, the mounting tooth plate 61 cannot move upward; the mounting tooth plate 61 and the rack structure on the mounting card plate 63 are unidirectional.

[0090] After the sealing rubber core 1 and the protective sleeve 3 in the shell 40 are assembled, the two are placed inside the shell 40. At this time, the top cover 41 is lifted by a crane and moved to the top of the shell 40. After the two are stable, the mounting tooth plate 61 on the top cover 41 is inserted into the slot 60 of the shell 40. Then the mounting tooth plate 61 will contact the mounting card plate 63 and squeeze the mounting card plate 63. After the top cover 41 is completely in contact with the shell 40, the rack structure of the mounting tooth plate 61 and the rack structure of the mounting card plate 63 are meshed with each other. At this time, the assembly of the top cover 41 and the shell 40 is completed.

[0091] If it is necessary to separate the top cover 41 from the shell 40, press the pressing block 65 upward so that the pressing block 65 pulls the mounting clamp 63 in the direction of the clamping spring 67 through the linkage rope 64. At this time, the mounting clamp 63 is separated from the mounting tooth plate 61. At this time, an external known crane can be used to apply upward pulling force to lift the top cover 41 and separate it from the shell 40.

[0092] See also Fig.13As shown, in addition, the present application also provides a rotary blowout preventer rubber core blowout prevention method, the rotary blowout preventer rubber core blowout prevention method is as follows:

[0093] S1. Installation work: The drilling tool 2 is inserted into the casing 40, the top cover 41 and the inside of the casing 40, and then controlled to go down into the well by a crane until the drilling tool 2 and the rotary blowout preventer 4 move to a designated position in the well.

[0094] S2, drilling operation: then control the drill bit 2 to rotate and operate the oil well. When the drill bit 2 is ready to rotate, oil is delivered to the second oil port in the shell 40. At this time, under the high pressure of the oil, the movable piston 44 is pushed to move upward along the inner wall of the shell 40. In this process, the movable piston 44 squeezes the two inner rubber parts 10 of the sealant core 1, so that the sealant core 1 gradually approaches the lamp. Through interference fit, the sealant core 1 is tightly attached to the outer wall of the drill bit 2. When the drill bit 2 rotates, the entire sealant core 1 and the protective sleeve 3 rotate synchronously and the rotating blowout preventer 4 works to control the wellhead pressure to prevent the material in the well from spraying out.

[0095] S3. Monitoring operation: When the drilling tool 2 is working, the monitoring part 42 in the shell 40 of the rotary blowout preventer 4 monitors the sealant core 1 in the shell 40. When the sealant core 1 is worn to expose the electrode sheet 421 of the monitoring part 42, the electrode sheet 421 will contact the drilling tool 2. The electrode sheet 421 is in a weak power circuit. When the electrode sheet 421 contacts the external metal material, the circuit where the electrode sheet 421 is located is short-circuited. At this time, the early warning device 422 starts to work and performs alarm processing, and at the same time prompts the sealant core 1 to be replaced. Then, after receiving the alarm instruction, the staff who controls the drilling tool 2 stops the operation and prepares for subsequent maintenance operations.

[0096] S4, collection operation: when the maintenance operation requires replacement of the sealant core 1, the operation on the drilling tool 2 is stopped, the drilling tool 2 and the rotary blowout preventer 4 are taken out by a crane, the rotary blowout preventer 4 is disassembled, and a new sealant core 1 is replaced. Meanwhile, the friction between the drilling tool 2 and the sealant core 1 may cause debris to be generated in the sealant core 1, which is protected by the protection part 5.

[0097] The high temperature resistant collecting cotton inside the collecting ring 50 can perform preliminary cleaning of soil particles adhered to the surface of the drilling tool 2, preventing too many soil particles from entering the working chamber of the sealant core 1, causing the sealant core 1 to wear too quickly. At the same time, it can also collect the debris generated by wear in the working chamber of the sealant core 1. The debris falls into the porous structure of the high temperature resistant collecting cotton, improving the efficiency of debris collection and avoiding excessive dispersion of debris. The high temperature resistant collecting cotton on the outside of the collecting ring 50 fits on the movable piston 44 and can collect the debris generated by wear on the outer wall of the sealant core 1. At the same time, when the sealant core 1 is replaced, the fallen debris is collected.

[0098] After the old sealant core 1 in the rotary blowout preventer 4 is replaced with a new sealant core 1, it is assembled with the drilling tool 2 and the oil well is processed again.

[0099] The embodiments of this specific implementation method are all preferred embodiments of the present invention, and are not intended to limit the protection scope of the present invention. Therefore, any equivalent changes made based on the structure, shape, and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A rotary blowout preventer rubber core blowout preventer system, characterized by: The invention comprises a sealing rubber core (1), wherein the sealing rubber core (1) is formed by integrating two inner rubber parts (10) of a truncated cone structure which are symmetrically distributed along the height direction, the middle part of the sealing rubber core (1) is a hollow structure to form a working cavity, and the working cavity is for a drilling tool (2) to pass through, and the sealing rubber core (1) is provided with a plurality of horizontally distributed installation grooves (11) at equal intervals along the circumferential direction of the axis; a protective clamping sleeve (3) for limiting the position of the sealing rubber core (1) is inserted and installed in each of the plurality of installation grooves (11) of the sealing rubber core (1), and a limiting clamping block (12) is also integrated on the protective clamping sleeve (3); and a limiting groove (13) for the limiting clamping block (12) to be clamped is also integrated on the installation groove (11) of the sealing rubber core (1); Also included is a rotary blowout preventer (4), the rotary blowout preventer (4) comprising a shell (40) and a top cover (41), the top cover (41) being arranged on the shell (40), and a monitoring unit (42) for monitoring the thickness of two inner rubber parts (10) of the sealing rubber core (1) being arranged in the shell (40); The monitoring part (42) comprises a plurality of monitoring grooves formed on the protective ferrule (3), a monitoring frame (420) being inserted into the monitoring groove of the protective ferrule (3), an electrode sheet (421) being provided at one end of the monitoring frame (420) close to the protective ferrule (3), two wires extending outward from the electrode sheet (421), an early warning device (422) being installed at one end of the two wires away from the electrode sheet (421), and the early warning device (422) being installed at one end of the monitoring frame (420) away from the protective ferrule (3); A protective portion (5) is also provided at the bottom of the sealing rubber core (1).

2. A rotary blowout preventer rubber core blowout preventer system according to claim 1, characterized in that: The sealing rubber core (1) is provided with a plurality of strip grooves (14) at equal intervals on both sides along the height direction, so that the two ends of the sealing rubber core (1) can be deformed under the action of external force to form an interference fit with the drilling tool (2).

3. A rotary blowout preventer rubber core blowout preventer system according to claim 1, characterized in that: The monitoring frame (420) is also provided with an adjusting member (43) for adjusting its position. The adjusting member (43) comprises an adjusting screw (430) rotatably arranged in a monitoring groove in the protective sleeve (3) via a bearing. An adjusting block (431) is screwed onto the adjusting screw (430). The adjusting block (431) is connected to the monitoring frame (420).

4. A rotary blowout preventer rubber core blowout preventer system according to claim 1, characterized in that: The protection part (5) comprises a collecting ring (50) resting against the bottom of the sealing rubber core (1), and a plurality of groups of connecting ropes (51) are arranged at equal intervals on the circumferential direction of the outer wall of the collecting ring (50), and the connecting ropes (51) extend outward along the height direction of the protective sleeve (3) and slide through the protective sleeve (3), and one end of the connecting rope (51) away from the collecting ring (50) is connected to a collecting plate (52), and a pre-tensioning spring (53) is arranged between the collecting plate (52) and the protective sleeve (3), and the pre-tensioning spring (53) is sleeved on the connecting rope (51).

5. A rotary blowout preventer rubber core blowout preventer system according to claim 4, characterized in that: The collecting ring (50) is provided with a collecting groove for collecting debris that falls off after friction of the sealant core (1), and the inner wall and the outer wall of the collecting ring (50) are both provided with high temperature resistant collecting cotton for collecting the debris.

6. A rotary blowout preventer rubber core blowout preventer system according to claim 1, characterized in that: A movable piston (44) is also slidably disposed in the housing (40) along its height direction, a limiting ring (45) is disposed at the bottom of the movable piston (44) to limit its movement, and the housing (40) is also provided with two oil inlets (46) at different heights along the height direction.

7. The rotary blowout preventer rubber core blowout preventer system according to claim 1, characterized in that: A self-installation component (6) for quick installation and removal is also provided between the top cover (41) and the shell (40), the self-installation component (6) comprising installation tooth plates (61) arranged at equal intervals at the bottom of the top cover (41) and a card slot (60) opened at the top of the shell (40), the installation tooth plate (61) of the top cover (41) is inserted into the card slot (60) of the shell (40), and the card slot (60) of the shell (40) is also provided with a card connection frame (62), a mounting card plate (63) extending toward the card slot (60) is slidably provided in the card connection frame (62), and a card connection compression spring (67) is provided between the installation card plate (63) and the card connection frame (62); A linkage rope (64) is connected to the back side of the mounting card plate (63); a pressing block (65) is provided at one end of the linkage rope (64) away from the mounting card plate (63); the pressing block (65) is slidably arranged on the clamping frame (62); and a movable groove (66) for the pressing block (65) to move is provided on the clamping frame (62).

8. A rotary blowout preventer rubber core blowout preventer system according to claim 7, characterized in that: The mounting tooth plate (61) and the mounting clamping plate (63) are both provided with a rack structure, and the rack structures on the mounting tooth plate (61) and the mounting clamping plate (63) are matched in one direction.

9. A method for preventing blowout with a rubber core of a rotary blowout preventer, according to a system for preventing blowout with a rubber core of a rotary blowout preventer as claimed in any one of claims 1 to 8, characterized in that: The blowout prevention method of the rotary blowout preventer rubber core is as follows: S1, installation work: inserting the drilling tool (2) into the casing (40), the top cover (41) and the inside of the casing (40), and then controlling it to go down the well by a crane until the drilling tool (2) and the rotary blowout preventer (4) are moved to a designated position in the well; S2, drilling operation: controlling the rotation of the drilling tool (2) to operate the oil well, while the inner rubber part (10) of the sealing rubber core (1) works to control the wellhead pressure to avoid blowout; S3, monitoring operation: when the drilling tool (2) is working, the monitoring part (42) on the protective sleeve (3) monitors the sealing rubber core (1) in the housing (40), and performs early warning processing when the inner rubber part (10) of the sealing rubber core (1) is damaged, and at the same time prompts that the inner rubber part (10) of the sealing rubber core (1) is to be replaced; S4, collection operation: when it is necessary to replace the sealant core (1), the drilling tool (2) stops operating, the drilling tool (2) and the rotary blowout preventer (4) are taken out by a crane, the rotary blowout preventer (4) is disassembled, and a new inner rubber part (10) is replaced. Meanwhile, the friction between the drilling tool (2) and the sealant core (1) may cause the inner rubber part (10) of the sealant core (1) to generate debris, which is protected by the protection part (5). Meanwhile, when the inner rubber part (10) of the sealant core (1) is replaced, the fallen debris is collected.

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