Repair device and method and preparation method of repair device

Abstract

The invention discloses a repairing device and method and a preparation method of the repairing device. A body of a blowout prevention box is fixed to a polish rod, the polish rod is sleeved with a pressing cap, and an inner thread and an outer thread both surround the polish rod. At least two repairing parts in the repairing device are detachably connected, and a positioning hole is defined by the arc limiting faces between the at least two repairing parts. And the repairing lines on the repairing cylindrical surface form repairing threads, so that the repairing threads with smaller diameters are rotationally matched with the internal threads, and the lines of the internal threads are rotationally corrected. The external thread repairing mode is the same as the internal thread repairing mode. And the positioning hole is used as a reference, so that the repaired internal thread and the repaired external thread can be buckled after being repaired. And after repairing, the repairing device is separated from the polish rod and the blowout prevention box. And the pressing cap sleeved on the polish rod is connected with the body and put into use. More structures do not need to be dismantled, and the labor intensity is low; and several hours required for stopping and putting the well during maintenance can be shortened to dozens of minutes. The problems that the labor intensity is increased and the well stopping time is too long due to maintenance of the blowout prevention box are solved to a certain extent.

Description

Technical Field

[0001] The present application belongs to the technical field of oil recovery and repair equipment, and in particular, relates to a repair device, a method and a preparation method of the repair device. Background Art

[0002] The blowout preventer box of the pumping well is an important seal that seals the annular space between the bare rod and the oil pipe, and connects the donkey head of the pumping unit with the bare rod, so as to ensure that when the crude oil is lifted from the bottom of the well to the wellhead Christmas tree, under the action of the blowout preventer, it cannot spray out from the bare rod, so that the crude oil can be pumped into the production pipeline entering the station. At the production site, during the use of the blowout preventer box of the pumping well, the packing of the blowout preventer box needs to be replaced frequently. When replacing the blowout preventer box, the well needs to be stopped, the rubber gate on the blowout preventer box is closed, the pressure cap of the blowout preventer box is removed from the body of the blowout preventer box, the old packing in the blowout preventer box is taken out, and the new packing is replaced to ensure that the blowout preventer box does not leak oil during the production of the oil well. The internal and external threads between the pressure cap and the body of the blowout preventer box will be severely worn during the long-term disassembly and assembly process, which is easy to cause slippage or the internal and external threads cannot be buckled together, and need to be replaced and repaired.

[0003] In the prior art, the blowout preventer is mounted on a polished rod, and the two ends of the polished rod are connected to the Christmas tree and the pumping unit respectively. When removing the blowout preventer, the well needs to be stopped to release the bottom hole pressure, and the desulfurization, crane, pumping unit and other equipment are required to cooperate before reinstalling the new blowout preventer. Repairing the blowout preventer increases the labor intensity of employees, and the long well shutdown time will affect the oil well production or cause underground geological faults, such as sand jam or no oil well fluid. Summary of the invention

[0004] The present application aims to at least to some extent solve the problems of increased labor intensity and excessive well stoppage time caused by the repair of the blowout preventer. To this end, the present application provides a repair device, method and preparation method of the repair device.

[0005] A repair device provided in an embodiment of the present application is used to repair the internal and external threads of a blowout preventer box, comprising: at least two repair parts, which are detachably connected to each other; each of the repair parts is provided with:

[0006] The arc limiting surface is enclosed between at least two of the repair parts to form a positioning hole, the positioning hole is used for transitional cooperation with the polished rod, the polished rod is fixed to the blowout prevention box and passes through the blowout prevention box, the internal thread and the external thread both surround the polished rod, and the axes of the internal thread and the external thread both extend along the axial direction of the positioning hole;

[0007] Two arc repair surfaces with different diameters are provided with repair lines. The two arc repair surfaces are respectively used to enclose two repair cylinders with different diameters. The repair lines corresponding to each repair cylinder form a repair thread. The repair thread with a smaller diameter is used to rotate with the internal thread to correct and repair the internal thread, and the repair thread with a larger diameter is used to rotate with the external thread to correct and repair the external thread.

[0008] In some embodiments provided in the present application, the cross-section of the repair component is fan-shaped, and the two arc repair surfaces are spaced apart along the axial direction of the repair component and are respectively located at two ends of the repair component in the axial direction.

[0009] In some embodiments provided in the present application, the repair component further comprises:

[0010] At least two distinguishing grooves are spaced apart from each other and connected to the arc repair surface with a larger diameter.

[0011] In some embodiments provided in the present application, the repair device further comprises:

[0012] At least two handles are connected to at least two of the repair parts in a one-to-one correspondence, and are spaced apart from the circular arc repair surface and the circular arc limiting surface.

[0013] In some embodiments provided in the present application, the handle is provided with anti-slip grooves.

[0014] The present application provides a repair method, which is implemented by using the repair device as described above, wherein the blowout preventer box comprises a body and a pressure cap connected to the outer thread through the inner thread, the body is fixedly connected to the polished rod, and the pressure cap is sleeved on the polished rod; the repair method comprises:

[0015] Separating the internal thread from the external thread;

[0016] Connect at least two of the repairing parts in the repairing device and sleeve the positioning hole onto the polished rod, wherein the repairing device is located between the body and the pressure cap;

[0017] Rotate the two repair cylinders in sequence to fit into the corresponding internal threads or external threads, and rotate the repair device so that the repair threads repair the corresponding internal threads or external threads;

[0018] Separate at least two of the repair parts, and threadably connect the repaired pressure cap to the body.

[0019] In some embodiments provided in the present application, before “separating the body and the pressure cap of the blowout preventer box connected by the internal thread and the external thread”, the repair method further includes:

[0020] Close the gate of the blowout preventer box and clean the blowout preventer box.

[0021] The present application provides a method for preparing a repair device, in which two repair parts are detachably connected via a connecting portion and a fastener, and is used to prepare the repair device as described above, comprising:

[0022] Processing the module to obtain at least two intermediate structures, wherein the intermediate structure is provided with the arc limiting surface and two arc repairing surfaces, and the arc repairing surfaces are processed with the repairing lines;

[0023] The connecting portion is processed on the intermediate structure to obtain the repair part.

[0024] In some embodiments provided in the present application, the preparation method further comprises:

[0025] The repair part is subjected to multiple hardening heat treatments.

[0026] In some embodiments provided in the present application, the repair part is made of steel material, and the “performing multiple hardening heat treatments on the repair part” includes:

[0027] embedding the repair part in a boronizing agent for annealing;

[0028] quenching the repaired part that has been annealed once;

[0029] The repaired part after quenching is subjected to multiple annealing treatments.

[0030] The embodiments of the present application have at least the following beneficial effects:

[0031] When the inner and outer threads of the body and the pressure cap of the blowout preventer box need to be repaired and corrected, the body of the blowout preventer box that needs to be repaired can be separated from the pressure cap first, but the body is fixed to the polished rod, and the pressure cap can be movably sleeved on the polished rod, and the outer thread of the pressure cap and the inner thread of the body are both arranged around the polished rod. There is no need to adjust the position of the pumping unit and the overall position of the blowout preventer box. When at least two repair parts in the repair device are detachably connected and the repair parts are connected to each other, the arc limiting surfaces between at least two repair parts are enclosed to form a positioning hole, and the repair part can be installed on the polished rod through the positioning hole. The repair device can be arranged between the pressure cap and the body of the blowout preventer box along the axial direction of the polished rod. When the arc limiting surface of the repair part forms the positioning hole, the two arc repair surfaces are respectively enclosed to form two repair cylinders with different diameters. On the basis of the positioning hole playing a positioning role in the position of the repair device relative to the polished rod, the axes of the two repair cylinders extend along the axial direction of the positioning hole, and the positioning hole can be used as the repair reference of the two repair cylinders. The repair lines on the repair cylinder form a repair thread, so that the repair thread with a smaller diameter can be rotated with the internal thread. The repair device rotates so that the repair thread rotates relative to the internal thread to correct the texture of the internal thread. The method of repairing the external thread is the same as that of the internal thread. The repair device can be reinstalled, or the repair device can be moved axially to separate the repair device from the internal thread, and then the repair thread with a larger diameter is rotated to cooperate with the external thread, and then rotated to repair. The positioning hole is used as a reference to ensure that when the repair device repairs the internal thread and the external thread respectively, the internal thread and the external thread can be stably buckled after repair. After the repair, multiple repair parts are separated, and the repair device is separated from the polished rod and the blowout preventer. The pressure cap still on the polished rod is reconnected to the body and put into use. The whole process does not require the removal of many structures, and the labor intensity is low; the several hours required to stop the well and release the well during maintenance can be shortened to more than ten minutes. To a certain extent, it solves the problems of increased labor intensity and long well stop time caused by the repair of the blowout preventer. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] Figure 1 A schematic diagram of the structure of a repair device provided in this application.

[0033] Figure 2 This is a bottom view of a repair device provided in this application.

[0034] Figure 3 A schematic diagram of the structure of the repair part provided in this application.

[0035] Figure 4 A schematic diagram of the structure of a blowout prevention box provided in this application.

[0036] Figure 5 A flow chart of a repair method provided for this application.

[0037] Figure 6 A flow chart of a method for preparing the repair device provided in this application.

[0038] Explanation of the reference numerals: 1. Repair part; 11. Arc limiting surface; 12. Arc repair surface; 13. Repair pattern; 14. Distinguishing groove; 2. Positioning hole; 3. Repair cylinder; 4. Repair thread; 5. Handle; 51. Anti-slip pattern; 10. Spray-proof box; 101. Main body; 102. Pressure cap; 103. Channel; 104. Valve. DETAILED DESCRIPTION

[0039] In order to enable technicians in the technical field to which the present application belongs to understand the present application more clearly, the technical solution of the present application is described in detail below through specific embodiments in conjunction with the accompanying drawings.

[0040] Figure 1 A structural schematic diagram of a repair device provided in this application, Figure 2 A bottom view of a repair device provided in this application, Figure 3 The structural diagram of the repair part provided for this application is shown in FIG. Figure 1 to Figure 3 The present invention provides a repair device for repairing the internal and external threads of a blowout prevention box 10, comprising at least two repair parts 1, which are detachably connected to each other. Each repair part 1 is provided with an arc limiting surface 11 and two arc repair surfaces 12 with different diameters.

[0041] The arc limiting surfaces 11 between at least two repair parts 1 enclose a positioning hole 2, which is used for transitional cooperation with the polished rod. The polished rod is fixed to the blowout preventer box 10 and passes through the blowout preventer box 10, and both the internal thread and the external thread surround the polished rod.

[0042] The two arc repair surfaces 12 with different diameters are both provided with repair lines 13 (the repair lines 13 are simplified in the relevant drawings). The two arc repair surfaces 12 are respectively used to enclose two repair cylinders 3 with different diameters. The repair lines 13 corresponding to each repair cylinder 3 form a repair thread 4, and the repair thread 4 with a smaller diameter is used to rotate with the internal thread to correct and repair the internal thread, and the repair thread 4 with a larger diameter is used to rotate with the external thread to correct and repair the external thread.

[0043] When the inner and outer threads of the body 101 and the pressure cap 102 of the blowout preventer 10 need to be repaired and corrected, the body 101 and the pressure cap 102 of the blowout preventer 10 that need to be repaired can be separated first, but the body 101 is fixed to the polished rod, and the pressure cap 102 can be movably sleeved on the polished rod, and the outer threads of the pressure cap 102 and the inner threads of the body 101 are both arranged around the polished rod. There is no need to adjust the position of the pumping unit and the blowout preventer 10 as a whole. When at least two repair parts 1 in the repair device are detachably connected and the repair parts 1 are connected to each other, the arc limiting surfaces 11 between at least two repair parts 1 enclose a positioning hole 2, and the repair part 1 can be installed on the polished rod through the positioning hole 2. The repair device can be arranged between the pressure cap 102 and the body 101 of the blowout preventer 10 along the axial direction of the polished rod. When the arc limiting surface 11 of the repair part 1 forms the positioning hole 2, the two arc repair surfaces 12 respectively enclose two repair cylinders 3 with different diameters. On the basis that the positioning hole 2 plays a positioning role in the position of the repair device relative to the polished rod, the axes of the two repair cylinders 3 extend along the axial direction of the positioning hole 2, and the positioning hole 2 can be used as the repair reference of the two repair cylinders 3. The repair lines 13 on the repair cylinder 3 form a repair thread 4, so that the repair thread 4 with a smaller diameter can rotate and cooperate with the internal thread. The repair device rotates to make the repair thread 4 rotate relative to the internal thread to correct the lines of the internal thread. The method of repairing the external thread is the same as that of the internal thread. The repair device can be reinstalled, or the repair device can be moved axially to separate the repair device from the internal thread, and then the repair thread 4 with a larger diameter can rotate and cooperate with the external thread, and then rotate to repair. The positioning hole 2 is used as a reference to ensure that when the repair device repairs the internal thread and the external thread respectively, the internal thread and the external thread can be stably buckled after repair. After repair, multiple repair parts 1 are separated, and the repair device is separated from the polished rod and the blowout preventer box 10. The pressure cap 102 still on the polished rod is reconnected with the body 101 and put into use. The whole process does not require the removal of many structures, and the labor intensity is low; the several hours required to stop and release the well during maintenance can be shortened to more than ten minutes. To a certain extent, the problems of increased labor intensity and long well stop time caused by the maintenance of the blowout preventer box 10 are solved. The repair device provided in the present application can be applied to the blowout preventer box 10 connected between the pressure cap 102 and the body 101 through internal and external threads, and the positions of the internal and external threads are not limited.

[0044] Moreover, the present application is easy to operate, can reduce production costs, avoid sand jams or oil wells not producing fluid, maintenance costs, procurement costs, reduce employee labor intensity, increase the production time of oil wells, ensure the safety of sulfur-related oil well operations, and have high safety benefits. The present application is not easy to damage, can be used multiple times, and can be changed in size according to the model standard of the blowout preventer 10. It can avoid geological problems that cause well repair costs and environmental pollution around the wellhead. The present application has been field tested on oil wells with good results and can be applied to similar pumping wells. For oil fields with a large number of oil wells, such as the Liaohe Oilfield, there are nearly 10,000 pumping wells. The use of the present application can greatly reduce the time required to repair the blowout preventer 10, and effectively reduce the impact of the repair of the blowout preventer 10 on production.

[0045] It should be noted that the arc limiting surface 11 and the arc repair surface 12 involved in the present application are curved surfaces whose cross sections are arc segments, and the cross sections are cross sections perpendicular to the axis of the curved surface. There is no need to release the bottom hole pressure because the main body 101 of the blowout preventer box 10 is still fixedly connected to the light rod, which can play a normal role in placing oil leaks and locking oil. The rotational correction and repair of the internal and external threads by the repair thread 4 can be achieved by increasing the strength of the repair thread 4 itself, and the repair part 1 itself can also be made of higher-strength steel or different materials, which is not limited in the present application. Based on the cooperation between the light rod and the blowout preventer box 10, the diameter of the positioning hole 2 is smaller than the diameter of the two repair cylinders 3.

[0046] In some embodiments provided in the present application, the rotation direction of the two repair threads 4 can also be adjusted, so that when the repair device is sleeved on the polished rod, the repair device is clamped between the pressure cap 102 and the body 101, and the two repair threads 4 are respectively matched with the internal thread and the external thread. The repair device is rotated so that the two repair threads 4 repair the internal thread and the external thread synchronously.

[0047] For ease of understanding, here is provided Figure 4 , Figure 4 This is a schematic diagram of the structure of a blowout prevention box 10 provided in this application. Figure 3 A relatively simple structural diagram of the anti-spray box 10 is shown in FIG. Figure 4 The body 101 of the blowout prevention box 10 and the pressure cap 102 can be connected by threads, and the body 101 and the polished rod are fixedly connected. The blowout prevention box 10 is provided with a channel 103 for passing the polished rod.

[0048] In some embodiments provided in the present application, the cross section of the repair component 1 is fan-shaped, and the two arc repair surfaces 12 are spaced apart along the axial direction of the repair component 1 and are respectively located at two ends of the repair component 1 in the axial direction.

[0049] The cross section of the repair part 1 is in the shape of a fan ring, which is convenient for the preparation of the repair part 1, and the two arc repair surfaces 12 can be respectively set as two arc surfaces with different diameters of the repair part 1. The two arc repair surfaces 12 are axially spaced and respectively located at the two ends of the repair part 1, which can facilitate the matching of the pressure cap 102 and the body 101 axially spaced from the polished rod, and the repair part 1 as a whole requires less space. It can also avoid interference by the repairer.

[0050] In some embodiments provided in the present application, the repair part 1 may also be set to be cylindrical or cubic or have different structures, and an arc groove may also be prepared on the repair part 1, with the side wall of the arc groove serving as the arc repair surface 12. Under the condition that the cross section of the repair part 1 is a fan ring, the arc repair surface 12 may also be set to be only a part of the two curved surfaces of the fan ring, and the two arc repair surfaces 12 may also be set to partially overlap in the axial direction of the repair part 1, and the two arc repair surfaces 12 may be spaced in the radial direction of the repair part 1. Correction and repair may also be achieved, and the present application does not limit this.

[0051] In some embodiments provided in the present application, the repair component 1 is further provided with at least two distinguishing grooves 14. At least two distinguishing grooves 14 are spaced apart from each other and connected to the arc repair surface 12 with a larger diameter. The distinguishing grooves 14 can be used to distinguish the two arc repair surfaces 12, so that the repair thread 4 with a larger diameter can be matched with the external thread, and the other repair thread 4 with a smaller diameter can be matched with the internal thread.

[0052] In some embodiments provided in the present application, the repair device further includes at least two handles 5. The at least two handles 5 are connected to at least two repair parts 1 in a one-to-one correspondence, and are spaced from the arc repair surface 12 and the arc limit surface 11. The addition of the handles 5 can facilitate the connection and installation of the repair parts 1.

[0053] In some embodiments provided in the present application, the handle 5 is provided with anti-slip grooves 51. This can facilitate the connection and installation of the repair component 1, and can also control the handle 5 to rotate the repair device as a whole.

[0054] In some embodiments provided in the present application, the handle 5 and the repair component 1 may be fixed by welding, or may be plugged together to achieve rotation, which is not limited in the present application.

[0055] In some embodiments provided in the present application, the repair device may also include two repair parts 1 arranged in half, each repair part 1 has a fan-shaped cross section, two arc repair surfaces 12 are respectively located at two ends of the repair part 1, and the two arc repair parts 1 are respectively located on two curved surfaces with different diameters of the repair part 1. The structure is simple, the preparation cost is low, and it is easy to use.

[0056] In some embodiments provided in the present application, the repair parts 1 can be detachably connected by fasteners. The two repair parts 1 can be positioned by connecting pins and pin holes, and then connected by threaded holes and bolts. The connection strength between the repair parts 1 can be increased. The threaded holes can be installed with hexagon socket head screws.

[0057] It should be noted that the threaded hole or the pin hole can be connected to the arc repair surface 12, and the present application does not impose any limitation on this.

[0058] In some embodiments provided in the present application, the repair component 1 can be made of steel material with high strength, but the present application does not impose any limitation on this.

[0059] Figure 5 A flowchart of a repair method provided for this application, refer to Figure 5 The present application provides a repair method, which is implemented by using the repair device as described above. The blowout preventer box includes a body and a pressure cap connected by internal threads and external threads. The body is fixedly connected to the polished rod, and the pressure cap is sleeved on the polished rod. The repair method includes:

[0060] S1: Separate the internal thread and external thread.

[0061] S2: Connect at least two repairing parts in the repairing device and sleeve the positioning hole onto the polished rod, so that the repairing device is located between the main body and the pressure cap.

[0062] S3: Rotate the two repair cylinders in sequence to fit into the corresponding internal threads or external threads, and rotate the repair device so that the repair threads repair the corresponding internal threads or external threads.

[0063] S4: Separate at least two repair parts and connect the repaired pressure cap to the main body by threading.

[0064] The technical effect of the repair device corresponding to the repair method can be referred to above, so it will not be repeated here. Using the above method, the time required to repair the thread of the blowout preventer is short, and the blowout preventer can be quickly put into use after repair.

[0065] In some embodiments provided in the present application, before “separating the body and the pressure cap of the blowout preventer box connected by the internal thread and the external thread”, the repair method further includes:

[0066] Close the gate of the blowout preventer box and clean the blowout preventer box. Closing the gate can maintain pressure and prevent oil leakage. Cleaning the blowout preventer box can facilitate subsequent repairs. Figure 4 The valve 104 of the blowout preventer box is shown in FIG.

[0067] Figure 6This is a flow chart of a method for preparing a repair device provided in the present application. The present application provides a method for preparing a repair device, wherein two repair parts are detachably connected via a connecting portion and a fastener. The method for preparing the repair device as described above comprises:

[0068] S101: Processing the module to obtain at least two intermediate structures, wherein the intermediate structure is provided with an arc limiting surface and two arc repairing surfaces, and the arc repairing surfaces are processed with repairing lines.

[0069] S102: Processing a connection portion in the intermediate structure to obtain a repair part.

[0070] The technical effect of the repair device can be referred to above, so it will not be repeated here. The repair device is prepared in the above manner, the preparation process is relatively simple, and the overall strength is also good. The intermediate structure is a structure in which the repair part is not fully formed and the module has been processed to a certain extent.

[0071] In some embodiments provided in the present application, in step S101, the arc limiting surface and the arc repairing surface of the intermediate structure can be obtained by mechanical processing, which is not limited in the present application.

[0072] In step S102, the connection part may be a pin hole and a threaded hole, and the pin hole is processed and then the threaded hole is tapped to ensure the overall strength.

[0073] In certain embodiments provided in the present application, when the repair device includes a handle, the connection operation of the handle can be performed last, which is convenient for preparation and will not affect the normal use of the repair device.

[0074] In some embodiments provided in the present application, the preparation method further comprises: performing multiple hardening heat treatments on the repair part. Performing multiple hardening heat treatments on the entire repair part can increase the hardness of the entire repair part to improve the effect of the repair part on the thread repair.

[0075] In some embodiments provided in the present application, the repair part is made of steel material, and “performing multiple hardening heat treatments on the repair part” may include:

[0076] The repaired part is buried in the boronizing agent for annealing. The repaired part that has been annealed once is quenched. The repaired part that has been quenched is annealed multiple times. The hardness and toughness of the repaired part can be greatly improved, which is beneficial to improving the effect of the repaired part on thread repair.

[0077] In some embodiments provided in this application, step S102 may also include:

[0078] Prepare the boronizing agent (70% ferroboron, 6% potassium fluoroborate, 4% ammonium carbonate, 20% charcoal), put the boronizing agent into the crucible, bury the fixed tooth block into the boronizing agent, put it into the heat treatment furnace, heat it to 910℃ at a constant temperature, keep it warm for 4 hours, cool it to 600℃ at a cooling rate of 30℃ / h, take it out of the furnace, and cool it naturally. Put the sodium chloride powder into the crucible, bury the fixed tooth block into the sodium chloride powder, put it into the heat treatment furnace, heat it to 830℃ at a constant temperature, keep it warm for 4 hours, cool it to 600℃ at a cooling rate of 30℃ / h, take it out of the furnace, and cool it with 100℃ boiling water. Put the quenched tooth block into the heat treatment furnace, heat it to 700℃ at a constant temperature, keep it warm for 2 hours, cool it to 500℃ at a cooling rate of 30℃ / h, take it out of the furnace, and cool it with 100℃ boiling water. Put the tempered tooth block into the heat treatment furnace, heat it to 600℃ at a constant temperature, keep it warm for 1h, cool it to 400℃ at a cooling rate of 30℃ / h, and cool it with 100℃ boiling water. Put the tooth block after finishing heat treatment into the hydrogen heat treatment electric furnace, heat it to 600℃ at a constant temperature, keep it warm for 1h, cool it to 400℃ at a cooling rate of 30℃ / h, and cool it with 100℃ boiling water. After completion, the mechanical properties test is carried out and the Vickers hardness value is 1650HV. The overall hardness of the repair part can be greatly improved.

[0079] It should be noted that the board surface referred to in this application is the surface with the largest area on the structure where the board surface is located. The parallel or perpendicularity involved in this application is relative to the concept of absolute parallelism or absolute perpendicularity in geometry, and a deviation of 0 to 10° is allowed. This application does not impose any restrictions on this.

[0080] Although the preferred embodiments of the present application have been described, those skilled in the art may make other changes and modifications to these embodiments once they have learned the basic creative concept. Therefore, the appended claims are intended to be interpreted as including the preferred embodiments and all changes and modifications that fall within the scope of the present application.

[0081] Obviously, those skilled in the art can make various changes and modifications to the present application without departing from the spirit and scope of the present application. Thus, if these modifications and variations of the present application fall within the scope of the claims of the present application and their equivalents, the present application is also intended to include these modifications and variations.

Claims

1. A repair device, characterized in that: The invention is used for repairing the internal and external threads of a blowout prevention box, comprising: at least two repair parts, which are detachably connected to each other; each of the repair parts is provided with: Arc limiting surfaces, wherein the arc limiting surfaces between at least two of the repair parts enclose a positioning hole, the positioning hole is used for transitional cooperation with a polished rod, the polished rod is fixed to the blowout prevention box and passes through the blowout prevention box, and the internal thread and the external thread both surround the polished rod; Two arc repair surfaces with different diameters are provided with repair lines. The two arc repair surfaces are respectively used to enclose two repair cylinders with different diameters. The axes of the two repair cylinders extend along the axial direction of the positioning hole. The repair lines corresponding to each repair cylinder form a repair thread. The repair thread with a smaller diameter is used to rotate with the internal thread to correct and repair the internal thread, and the repair thread with a larger diameter is used to rotate with the external thread to correct and repair the external thread.

2. The repair device according to claim 1, characterized in that: The cross section of the repair component is in the shape of a fan ring, and the two arc repair surfaces are spaced apart along the axial direction of the repair component and are respectively located at two ends of the repair component in the axial direction.

3. The repair device according to claim 1, characterized in that: The repair part also has: At least two distinguishing grooves are spaced apart from each other and connected to the arc repair surface with a larger diameter.

4. The repair device according to any one of claims 1 to 3, characterized in that: The repair device also includes: At least two handles are connected to at least two of the repair parts in a one-to-one correspondence, and are spaced apart from the circular arc repair surface and the circular arc limiting surface.

5. The repair device according to claim 4, characterized in that: The handle is provided with anti-slip grooves.

6. A repair method, characterized in that: The repair device according to any one of claims 1 to 5 is used, wherein the blowout preventer box comprises a body and a pressure cap connected to the outer thread through the inner thread, the body is fixedly connected to the polished rod, and the pressure cap is sleeved on the polished rod; the repair method comprises: Separating the internal thread from the external thread; Connect at least two of the repairing parts in the repairing device and sleeve the positioning hole onto the polished rod, wherein the repairing device is located between the body and the pressure cap; Rotate the two repair cylinders in sequence to fit into the corresponding internal threads or external threads, and rotate the repair device so that the repair threads repair the corresponding internal threads or external threads; Separate at least two of the repair parts, and threadably connect the repaired pressure cap to the body.

7. The repair method according to claim 6, characterized in that: Before "separating the body and the pressure cap of the blowout prevention box connected by the internal thread and the external thread", the repair method also includes: Close the gate of the blowout preventer box and clean the blowout preventer box.

8. A method for preparing a repair device, characterized in that: In the repair device, the two repair parts are detachably connected through a connecting portion and a fastener, and the repair device used to prepare any one of claims 1 to 5 comprises: Processing the module to obtain at least two intermediate structures, wherein the intermediate structure is provided with the arc limiting surface and two arc repairing surfaces, and the arc repairing surfaces are processed with the repairing lines; The connecting portion is processed on the intermediate structure to obtain the repair part.

9. The preparation method according to claim 8, characterized in that: The preparation method further comprises: The repair part is subjected to multiple hardening heat treatments.

10. The preparation method according to claim 9, characterized in that: The repair part is made of steel material, and the "performing multiple hardening heat treatments on the repair part" includes: embedding the repair part in a boronizing agent for annealing; quenching the repaired part that has been annealed once; The repaired part after quenching is subjected to multiple annealing treatments.

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