Taking-out device for centralizing sleeve and valve seat of check valve and working method of taking-out device

Abstract

The invention belongs to the technical field of oil development, and relates to a device for taking out a centralizing sleeve and a valve seat of a check valve and a working method of the device. Comprising a pull rod, the pull rod is used for placing the excitation base in a centralizing sleeve cavity or the bottom of a valve seat, and after the centralizing sleeve or the valve seat is hooked by the hook pin, the hook pin, the excitation base and a part to be taken out are pulled out of the check valve body through the pull rod. The pull rod is sleeved with an excitation base, a guide slope is arranged on the excitation base, a plurality of hook pins are arranged in the circumferential direction of the pull rod, hanging steps and guide faces capable of being attached to the guide slope are arranged on the hook pins, the guide slope is matched with the guide faces so that radial movement of the hook pins can be achieved, and in addition, the excitation base can apply axial force to the hook pins. The centering sleeve and the valve seat of the check valve can be rapidly and conveniently taken out, and the inspection and maintenance efficiency is improved. And for check valve bodies of different models, only different hook pins need to be replaced, so that the universality is good.

Description

Technical Field

[0001] The invention belongs to the technical field of petroleum development, and relates to a device for taking out a check valve straightening sleeve and a valve seat, and a working method thereof. Background Art

[0002] The well-killing manifold is one of the main well control equipment for handling overflow, well kick and blowout. It is mainly composed of manual flat valves and check valves. The check valve plays a reverse sealing role to prevent liquid backflow during the injection of well-killing fluid and fire extinguishing agent. Therefore, ensuring the integrity, safety and reliability of the check valve is a necessary prerequisite for ensuring the safety of well control and drilling operations. In the process of inspecting and repairing the well-killing manifold, the inspection of key parts such as the check valve body, valve seat sealing surface and valve seat sealing ring is an indispensable step. Since the clearance between the check valve seat and the righting sleeve and the valve body chamber is very small, the drilling fluid and cement and other solidifying liquids flowing through the check valve chamber in the field use penetrate into the gap between the valve seat and the righting sleeve and the valve body chamber, causing the valve seat and the righting sleeve to adhere to the valve body chamber and difficult to remove.

[0003] At present, during the inspection and maintenance process of the well-killing manifold check valve, the corrosion of the chamber and the valve seat surface is mainly checked visually and through an endoscope. For the check valve that needs to replace the valve seat seal ring or valve seat, the oil immersion method is used to soften and loosen the adhesion in the gap between the valve seat and the straightening sleeve and the valve body chamber, so that the valve seat can be removed and the valve seat seal ring or valve seat can be replaced. Finally, the sealing pressure test method is used to check the reliability of the check valve.

[0004] However, although the oil immersion method is simple and low-cost, it takes a long time to immerse, and the gap is too small for the oil to penetrate and loosen the adhesion to remove the valve seat smoothly, so the effect is not good. For the check valve that fails the pressure test and is difficult to remove the righting sleeve and valve seat, the only way is to replace the whole valve, which greatly increases the maintenance time and cost. Summary of the invention

[0005] In order to overcome the shortcomings of the above-mentioned prior art, the purpose of the present invention is to provide a device for removing the straightening sleeve and valve seat of a check valve and a working method thereof. The present invention can quickly and conveniently remove the straightening sleeve and valve seat of the check valve, improves the efficiency of inspection and maintenance, and has good versatility.

[0006] In order to achieve the above object, the present invention adopts the following technical solutions:

[0007] The present invention discloses a device for removing a check valve straightening sleeve and a valve seat, comprising a pull rod, an excitation base sleeved on the pull rod, a guide slope on the excitation base, a plurality of hook pins arranged circumferentially of the pull rod, and a hanging step and a guide surface capable of fitting with the guide slope on the hook pin.

[0008] Furthermore, a removal sleeve is sleeved on the pull rod, and the removal sleeve can be sleeved on the excitation base. The excitation base is provided with a supporting step for supporting the removal sleeve, and the removal sleeve is provided with a plurality of hook holes for arranging the hanging steps.

[0009] Furthermore, the hanging steps are arranged with vertical pull rods.

[0010] Furthermore, the hook holes are evenly arranged along the circumference of the removal sleeve.

[0011] Furthermore, the removal sleeve is provided with an excitation hole for penetrating the excitation base and a limiting hole for penetrating the pull rod, the excitation hole is connected with the hook hole, and the outer diameter of the supporting step is larger than the inner diameter of the excitation hole.

[0012] Furthermore, the inner diameter of the excitation hole is larger than the inner diameter of the limiting hole.

[0013] Furthermore, the pull rod and the excitation base are detachably fixedly connected.

[0014] Furthermore, a support plate is sleeved on the pull rod, and the support plate and the excitation base are respectively located on both sides of the hook pin.

[0015] Furthermore, an excitation nut is sleeved on the pull rod, and the excitation nut and the hook pin are respectively located on two sides of the support plate.

[0016] The present invention also discloses a method for removing a check valve straightening sleeve and a valve seat, comprising the following steps:

[0017] Fix the excitation base on the pull rod, and insert the excitation base into the chamber of the righting sleeve or the bottom of the valve seat through the pull rod;

[0018] Arrange the hook pin on the excitation base along the circumference of the pull rod, make the guiding slope and the guiding surface make initial contact, pull the pull rod upward, and drive the hook pin to move radially through the guiding slope and the guiding surface until the hanging step completely enters the hook groove of the straightening sleeve or the hanging step is hung at the bottom of the valve seat;

[0019] The hook pin, the excitation base and the straightening sleeve or the valve seat of the component to be removed are all pulled out of the check valve body by the pull rod.

[0020] Compared with the prior art, the present invention has the following beneficial effects:

[0021] The present invention discloses a device for removing a straightening sleeve and a valve seat of a check valve, comprising a pull rod, the pull rod being used to place an excitation base in the chamber of the straightening sleeve or at the bottom of the valve seat, and after a hook pin hooks the straightening sleeve or the valve seat, the hook pin, the excitation base and the components to be removed are pulled out of the check valve body through the pull rod. An excitation base is sleeved on the pull rod, and the excitation base cooperates with the hook pin to realize radial movement of the hook pin. In addition, the pull rod pulls the excitation base, and the excitation base can apply an axial force to the hook pin. A guide slope is provided on the excitation base, and a plurality of hook pins are arranged circumferentially on the pull rod. The hook pin is provided with a hanging step and a guide surface that can be fitted with the guide slope, and the guide slope cooperates with the guide surface to realize radial movement of the hook pin. The present invention can quickly and conveniently remove the straightening sleeve and the valve seat of the check valve, thereby improving the efficiency of inspection and maintenance. For check valve bodies of different models, only different hook pins need to be replaced, and the device has good versatility.

[0022] The method of the present invention fixes the excitation base on the pull rod, and the excitation base is inserted into the chamber of the righting sleeve or the bottom of the valve seat through the pull rod. The hook pin is arranged on the excitation base along the circumference of the pull rod, so that the guide slope and the guide surface are initially in contact, and the pull rod is pulled upward to drive the hook pin to move radially through the guide slope and the guide surface until the hanging step completely enters the hook groove of the righting sleeve or the hanging step is hung at the bottom of the valve seat. The hook pin, the excitation base and the righting sleeve or the valve seat to be removed are all pulled out of the one-way valve body through the pull rod. For different types of one-way valve bodies, only different hook pins need to be replaced. The present invention can quickly and conveniently remove the righting sleeve and the valve seat of the one-way valve, improves the efficiency of inspection and maintenance, and has good versatility. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 It is a schematic diagram of the overall structure of the present invention before excitation;

[0024] Figure 2 It is a schematic diagram of the overall structure after the present invention is excited;

[0025] Figure 3 This is a schematic diagram of the installation state when the check valve righting sleeve of the present invention is taken out;

[0026] Figure 4 This is a schematic diagram of the installation state when the check valve seat of the present invention is taken out;

[0027] Figure 5 It is a structural diagram of the removal sleeve of the present invention;

[0028] Figure 6 It is a structural diagram of the hook pin of the present invention;

[0029] Figure 7 It is a three-view drawing of the hook pin of the present invention;

[0030] Figure 8It is a schematic diagram of the structure of the excitation base of the present invention;

[0031] Fig. 9 It is a schematic diagram of the installation structure of the overall structure of the present invention and the check valve body.

[0032] Among them: 1. Excitation nut; 2. Support plate; 3. Pull rod; 4. Removal sleeve; 5. Hook pin; 6. Excitation base; 7. Straightening sleeve; 8. Valve seat; 9. Check valve body; 401. Hook hole; 402. Excitation hole; 403. Limit hole; 501. Hanging step; 502. Working surface; 503. Guide surface; 601. Support step; 602. Excitation surface; 603. Guide slope; 604. Excitation base internal thread; 702. Hook groove; 802. Valve seat sealing ring; 902. Check valve cover bolt. DETAILED DESCRIPTION

[0033] In order to enable those skilled in the art to better understand the scheme of the present invention, the technical scheme in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work should fall within the scope of protection of the present invention.

[0034] It should be noted that the terms "first", "second", etc. in the specification and claims of the present invention and the above-mentioned drawings are used to distinguish similar objects, and are not necessarily used to describe a specific order or sequence. It should be understood that the data used in this way can be interchanged where appropriate, so that the embodiments of the present invention described herein can be implemented in an order other than those illustrated or described herein. In addition, the terms "including" and "having" and any variations thereof are intended to cover non-exclusive inclusions, for example, a process, method, system, product or device that includes a series of steps or units is not necessarily limited to those steps or units that are clearly listed, but may include other steps or units that are not clearly listed or inherent to these processes, methods, products or devices.

[0035] The present invention is further described in detail below in conjunction with the accompanying drawings:

[0036] See also Figure 1The present invention discloses a device for removing a check valve righting sleeve and a valve seat, comprising a pull rod 3, the pull rod 3 is used to place an excitation base 6 in a chamber of a righting sleeve 7 or at the bottom of a valve seat 8, after a hook pin 5 hooks the righting sleeve 7 or the valve seat 8, the hook pin 5, the excitation base 6 and the components to be removed are pulled out of the check valve body 9 through the pull rod 3. The excitation base 6 is sleeved on the pull rod 3, and the excitation base 6 cooperates with the hook pin 5 to realize radial movement of the hook pin 5, and in addition, the pull rod 3 pulls the excitation base 6, and the excitation base 6 can apply an axial force to the hook pin 5. A guiding slope 603 is provided on the excitation base 6, and a plurality of hook pins 5 are arranged circumferentially of the pull rod 3. A hanging step 501 and a guide surface 503 which can fit with the guiding slope 603 are provided on the hook pin 5. The guiding slope 603 cooperates with the guide surface 503 to realize radial movement of the hook pin 5. When the hanging step 501 completely enters the hook groove 702 of the straightening sleeve 7 or the hanging step 501 is hung at the bottom of the valve seat 8, the radial movement of the hook pin 5 stops, and the hook pin 5 is confined between the excitation base 6 and the straightening sleeve 7 or the valve seat 8 of the component to be removed. Then, the excitation base 6 is pulled by the pull rod 3, and the excitation base 6 exerts an axial force on the hook pin 5, thereby driving the straightening sleeve 7 or the valve seat 8 of the component to be removed to be completely pulled out of the valve body 9 of the single-flow valve. Fig. 9 The schematic diagram of the overall structure of the present invention and the installation structure of the check valve body. The present invention can quickly and conveniently remove the straightening sleeve and valve seat of the check valve, thereby improving the efficiency of inspection and maintenance. For check valve bodies 9 of different models, only different hook pins 5 need to be replaced, and the versatility is good.

[0037] See also Figure 1 In another feasible embodiment of the present invention, the following is modified adaptively according to the situation. It includes a pull rod 3, an excitation base 6 is sleeved on the pull rod 3, a guide slope 603 is provided on the excitation base 6, and a plurality of hook pins 5 are arranged around the pull rod 3, see Figure 6 and Figure 7 The hook pin 5 is provided with a hanging step 501 and a guide surface 503 which can fit with the guide inclined surface 603 .

[0038] When in use, the excitation base 6 is placed in the chamber of the straightening sleeve 7 or the bottom of the valve seat 8 through the pull rod 3, and then the hook pin 5 is placed between the pull rod 3 and the straightening sleeve 7 or the valve seat 8 of the part to be removed. Figure 1 This is a schematic diagram of the overall structure of the present invention before excitation. Figure 2 The schematic diagram of the overall structure after the present invention is excited. When the exciting base 6 is pulled upward, the guiding slope 603 of the exciting base 6 cooperates with the guiding surface 503 to realize the radial movement of the hook pin 5. When the hanging step 501 completely enters the hook groove 702 of the straightening sleeve 7 or the hanging step 501 is hung at the bottom of the valve seat 8, the radial movement of the hook pin 5 stops, and the hook pin 5 is confined between the exciting base 6 and the straightening sleeve 7 or the valve seat 8 of the part to be removed. Figure 3 This is a schematic diagram of the installation state when the check valve righting sleeve is taken out of the present invention. Figure 4 The schematic diagram of the installation state of the check valve seat when the present invention is taken out is shown. Pull the pull rod 3 again, the pull rod 3 pulls the excitation base 6 upward, the excitation base 6 can apply an axial force to the hook pin 5, and the excitation base 6 is pulled by the pull rod 3, thereby driving the hook pin 5 and the straightening sleeve 7 or the valve seat 8 of the component to be taken out to be pulled out from the check valve body 9. Fig. 9 The schematic diagram of the overall structure of the present invention and the installation structure of the check valve body. The present invention can quickly and conveniently remove the straightening sleeve and valve seat of the check valve, thereby improving the efficiency of inspection and maintenance. For check valve bodies 9 of different models, only different hook pins 5 need to be replaced, and the versatility is good.

[0039] Embodiment 1:

[0040] See also Figure 1 The present embodiment discloses a device for removing a check valve straightening sleeve and a valve seat, including a pull rod 3, on which an excitation base 6 is sleeved, on which a guide slope 603 is provided, and a plurality of hook pins 5 are arranged circumferentially of the pull rod 3, on which a hanging step 501 and a guide surface 503 capable of fitting with the guide slope 603 are provided.

[0041] The pull rod 3 is provided with a take-out sleeve 4, which can be sleeved on the excitation base 6, and the excitation base 6 is provided with a support step 601 for supporting the take-out sleeve 4, see Figure 8 The removal sleeve 4 is provided with a plurality of hook holes 401 for arranging the hanging steps 501, see Figure 5 The provision of the removal sleeve 4 is beneficial to enhancing the stability of the hanging step 501 during operation.

[0042] The hanging step 501 is arranged perpendicular to the pull rod 3 .

[0043] Embodiment 2:

[0044] See also Figure 1 Based on the above embodiment, the hook holes 401 of this embodiment are evenly arranged along the circumference of the removal sleeve 4.

[0045] The removal sleeve 4 is provided with an excitation hole 402 for penetrating the excitation base 6 and a limiting hole 403 for penetrating the pull rod 3 . The excitation hole 402 is connected to the hook hole 401 . The outer diameter of the support step 601 is larger than the inner diameter of the excitation hole 402 .

[0046] The inner diameter of the excitation hole 402 is greater than the inner diameter of the limiting hole 403 .

[0047] Embodiment three:

[0048] See also Figure 1The present embodiment discloses a device for removing a check valve straightening sleeve and a valve seat, including a pull rod 3, on which an excitation base 6 is sleeved, on which a guide slope 603 is provided, and a plurality of hook pins 5 are arranged circumferentially of the pull rod 3, on which a hanging step 501 and a guide surface 503 capable of fitting with the guide slope 603 are provided.

[0049] The pull rod 3 and the excitation base 6 are detachably fixedly connected to facilitate replacement, maintenance and repair.

[0050] Embodiment 4:

[0051] See also Figure 1 The present embodiment discloses a device for removing a check valve straightening sleeve and a valve seat, including a pull rod 3, on which an excitation base 6 is sleeved, on which a guide slope 603 is provided, and a plurality of hook pins 5 are arranged circumferentially of the pull rod 3, on which a hanging step 501 and a guide surface 503 capable of fitting with the guide slope 603 are provided.

[0052] See also Figures 1 to 4 A support plate 2 is sleeved on the pull rod 3, and the pull rod 3 is engaged with the support plate 2 through threads. The support plate 2 and the excitation base 6 are respectively located on both sides of the hook pin 5.

[0053] See also Figures 1 to 4 An excitation nut 1 is sleeved on the pull rod 3, and the excitation nut 1 and the hook pin 5 are respectively located on both sides of the support plate 2.

[0054] The support plate 2 is used to axially position the pull rod 3 and provide support for the excitation nut 1 . The support plate 2 cooperates with the excitation nut 1 to facilitate the removal of the pull rod 3 .

[0055] Embodiment five:

[0056] This embodiment discloses a device for removing a check valve straightening sleeve and a valve seat, comprising a support plate 2, a force-applying part and an excitation part. The force-applying part comprises a removal sleeve 4 and a hook pin 5, and the excitation part comprises an excitation base 6, a pull rod 3 and an excitation nut 1;

[0057] See also Fig. 9 The support plate 2 is placed on the check valve body 9 or the check valve cover bolt 902, and is used to support and fix and withstand the reaction force when the tool is excited. A limit hole is provided in the center of the support plate 2;

[0058] The pull rod 3 is movably arranged in the limiting hole in the center of the support plate 2 and is distributed on the upper and lower sides of the support plate 2. The excitation nut 1 is connected to the upper end of the pull rod 3, and the excitation base 6 is connected to the lower end of the pull rod 3.

[0059] The removal sleeve 4 is sleeved on the pull rod 3 and placed on the upper part of the excitation base 6. The pull rod 3 is connected to the excitation base 6 and the removal sleeve 4 sleeved on the pull rod 3 passes through the straightening sleeve 7 or the valve seat 8 of the check valve and is placed in the check valve chamber. The hook pins 5 are evenly arranged in the hook holes 401 around the removal sleeve 4.

[0060] The excitation nut 1 can drive the pull rod 3 and then drive the excitation base 6 to move upward along the direction of the central axis of the pull rod 3, so that the hook pin 5 in the hook hole 401 on the removal sleeve 4 moves radially outward along the pull rod 3, so that the hook pin 5 extends to the hook groove 702 of the straightening sleeve 7 or the lower part of the lower end surface of the valve seat 8, and further moves upward with the straightening sleeve 7 or the valve seat 8, thereby successfully removing the straightening sleeve 7 or the valve seat 8 of the single-flow valve.

[0061] According to the different models and specifications of the removal device, the support plate 2, the excitation base 6, the pull rod 3 and the excitation nut 1 remain unchanged, and the hook pin 5 and the removal sleeve 4 are replaced in a matching manner to realize the removal of the straightening sleeve 7 and the valve seat 8 of different models and specifications, with good versatility;

[0062] The inner side of the hook pin 5 is an arc surface, and a guide surface 503 is provided at the lower part thereof to facilitate the activation and extension of the hook pin 5. The outer side of the hook pin is designed according to the structure of the centralizing sleeve 7 and the valve seat 8 to be taken out, but it is necessary to ensure that the hook pin 5 can stably hang the centralizing sleeve 7 and the valve seat 8 to be taken out after being activated and extended out;

[0063] The removal sleeve 4 is a hollow cylindrical shape, with a limit hole 403 on the top and an excitation hole 402 on the bottom. The limit hole 403 and the excitation hole 402 are coaxial with the removal sleeve 4. The removal sleeve 4 is evenly provided with hook holes 401 around it. The hook holes 401 pass through the removal sleeve 4 body from the outside and communicate with the internal excitation hole 402. The size of the hook hole 401 is slightly larger than the hook pin 5 to meet the clearance fit.

[0064] The excitation base 6 is a stepped cylinder, on which a support step 601 is provided for supporting the removal sleeve 4 and bearing the force during the removal process. The excitation base 6 is provided with a guide slope 603 to guide the hook pin to move downward, and the excitation surface 602 is used to push the hook pin 5 to the set position to ensure that the hook pin 5 hooks the straightening sleeve 7 or the valve seat 8. The excitation base 6 is provided with an excitation base internal thread 604, which is convenient for connection with the pull rod. The excitation base internal thread 604 runs through the entire excitation base 6 from the top and is coaxial with the excitation base 6;

[0065] The excitation nut 1 is a hexagonal nut with a centered screw hole. Its internal thread parameters are consistent with the excitation base internal thread 604 of the excitation base, with only the length being different. The pull rod 3 is a cylindrical rod with external threads at both ends. The length of the upper thread is 1 / 4-1 / 3 of the length of the pull rod 3, and the length of the lower thread is similar to the height of the excitation base 6. The external thread of the pull rod 3 can be matched and connected with the internal thread of the excitation nut 1 and the excitation base 6.

[0066] The limiting hole of the support plate 2 is coaxial with the body, and the apertures of the limiting holes on the removal sleeve 4 and the support plate 2 are consistent;

[0067] The outer diameter of the removal sleeve 4 and the outer diameter of the support step 601 of the excitation base 6 are slightly smaller than the inner diameter of the centralizing sleeve 7 and the valve seat 8 to be removed, so as to facilitate penetration therein when removing;

[0068] The diameter of the excitation hole 402 on the removal sleeve 4 is slightly larger than the curvature diameter of the excitation surface 602 on the excitation base 6, ensuring the clearance fit between the removal sleeve 4 and the excitation base 6; the curvature of the working surface 502 of the hook pin 5 is consistent with the curvature of the excitation surface 602 of the excitation base 6, so that the hook pin 5 can extend into place during excitation.

[0069] The number of the hook holes 401 and the hook pins 5 is at least two.

[0070] Based on the structure of the present invention, the present invention also discloses a method for removing a check valve straightening sleeve and a valve seat, comprising the following steps:

[0071] Fix the excitation base 6 on the pull rod 3, and insert the excitation base 6 into the chamber of the straightening sleeve 7 or the bottom of the valve seat 8 through the pull rod 3;

[0072] Arrange the hook pin 5 on the excitation base 6 along the circumference of the pull rod 3, make the guide slope 603 and the guide surface 503 initially contact, pull the pull rod 3 upward, and drive the hook pin 5 to move radially through the guide slope 603 and the guide surface 503, until the hanging step 501 completely enters the hook groove 702 of the straightening sleeve 7 or the hanging step 501 is hung at the bottom of the valve seat 8;

[0073] The hook pin 5 , the excitation base 6 and the straightening sleeve 7 or the valve seat 8 of the component to be removed are all pulled out from the check valve body 9 through the pull rod 3 .

[0074] In another feasible embodiment of the present invention, the following is adaptively modified according to the situation: the excitation base 6 is fixed on the pull rod 3, and the excitation base 6 is inserted into the chamber of the straightening sleeve 7 or the bottom of the valve seat 8 through the pull rod 3. Figure 1Schematic diagram of the overall structure of the present invention before excitation. The hook pin 5 is arranged on the excitation base 6 along the circumference of the pull rod 3, so that the guide slope 603 and the guide surface 503 are initially in contact, and the pull rod 3 is pulled upward to drive the hook pin 5 to move radially through the guide slope 603 and the guide surface 503 until the hanging step 501 completely enters the hook groove 702 of the straightening sleeve 7 or the hanging step 501 is hung at the bottom of the valve seat 8. Figure 2 It is a schematic diagram of the overall structure after the present invention is excited, Figure 3 This is a schematic diagram of the installation state when the check valve righting sleeve is taken out of the present invention. Figure 4 The figure is a schematic diagram of the installation state when the check valve seat is removed. The hook pin 5, the excitation base 6 and the straightening sleeve 7 or the valve seat 8 of the component to be removed are all pulled out from the check valve body 9 through the pull rod 3. The present invention can quickly and conveniently remove the straightening sleeve and the valve seat of the check valve, thereby improving the efficiency of inspection and maintenance. For different types of check valve bodies 9, only different hook pins 5 need to be replaced, and the versatility is good.

[0075] Embodiment six:

[0076] This embodiment takes the removal of the check valve straightening sleeve 7 as an example, and the removal steps are as follows:

[0077] Remove the valve cover bolts of the well-killing manifold check valve, and remove the internal valve cover, valve cover seal ring, spring, valve core and other components, leaving only the check valve body 9, valve seat 8, valve seat seal ring 802 and the centering sleeve 7. In order to observe the tool excitation and the hanging condition of the hook pin 5, install 3 or more check valve cover bolts 902 evenly on the check valve body 9 to prepare for removing the centering sleeve and valve seat;

[0078] Prepare the removal sleeve 4 and hook pin 5 of the type and size corresponding to the model and specifications of the wellbore manifold check valve to be disassembled. Since the lower part of the straightening sleeve 7 is completely in contact with the valve seat, the straightening sleeve 7 can only be removed by hanging the hook pin 5 in the hook groove 702, thus adopting the hook pin 5 with a stepped L-shaped structure.

[0079] Connect the lower end of the pull rod 3 to the excitation base 6 through threads, and lower it as a whole to a position below the hook groove 702 in the chamber of the straightening sleeve 7. Put the removal sleeve 4 on the pull rod 3, and install the prepared hook pin 5 in the hook hole 401 of the removal sleeve 4, so that the outer edge of the hook pin 5 is flush with the outer edge of the removal sleeve 4 to avoid obstruction during the lowering process. Figure 1 ;

[0080] Put the assembled removal sleeve 4 and hook pin 5 stably on the upper end of the excitation base 6 as a whole, so that the guide surface 503 of the hook pin 5 contacts the guide inclined surface of the excitation base 6 and moves downward under the action of gravity, pull the pull rod 3 upward to adjust the tool position, so that the hook pin 5 is excited and extended, until the lower end surface of the removal sleeve 4 contacts the step surface of the support step 601 of the excitation base 6, and the working surface 502 of the hook pin 5 fits with the excitation surface 602 of the excitation base 6, and the L-shaped hook pin 5 is hung in the hook groove 702 of the straightening sleeve 7 to be removed, see Figure 3 and Figure 4 ;

[0081] The support plate 2 is inserted on the tie rod 3, and the support plate 2 is lowered to the check valve cover bolt 902 on the upper part of the check valve body 9, and the excitation nut 1 is connected to the upper part of the tie rod 3 and tightened manually. Use a wrench corresponding to the specification and size of the excitation nut 1 to rotate the excitation nut 1 clockwise, and drive the tie rod 3 by rotating the excitation nut. Under the support of the support plate, the tie rod 3 drives the excitation base 6 to move up with the removal sleeve 4, the hook pin 5, and the straightening sleeve 7 hanging on the hook pin 5, so as to successfully remove the straightening sleeve 7 of the check valve.

[0082] The above contents are only for explaining the technical idea of ​​the present invention and cannot be used to limit the protection scope of the present invention. Any changes made on the basis of the technical solution in accordance with the technical idea proposed by the present invention shall fall within the protection scope of the claims of the present invention.

Claims

1. A device for removing a check valve straightening sleeve and a valve seat, characterized in that: The invention comprises a pull rod (3), an excitation base (6) is sleeved on the pull rod (3), a guide slope (603) is provided on the excitation base (6), a plurality of hook pins (5) are arranged in the circumference of the pull rod (3), and a hanging step (501) and a guide surface (503) capable of fitting with the guide slope (603) are provided on the hook pins (5).

2. A device for removing a check valve straightening sleeve and a valve seat as claimed in claim 1, characterized in that: The pull rod (3) is provided with a removal sleeve (4), and the removal sleeve (4) can be mounted on the excitation base (6). The excitation base (6) is provided with a supporting step (601) for supporting the removal sleeve (4), and the removal sleeve (4) is provided with a plurality of hook holes (401) for arranging the hanging steps (501).

3. A device for removing a check valve straightening sleeve and a valve seat as claimed in claim 2, characterized in that: The hanging step (501) is arranged perpendicular to the pull rod (3).

4. A device for removing a check valve straightening sleeve and a valve seat as claimed in claim 2, characterized in that: The hook holes (401) are evenly arranged along the circumference of the removal sleeve (4).

5. A device for removing a check valve straightening sleeve and a valve seat as claimed in claim 4, characterized in that: The removal sleeve (4) is provided with an excitation hole (402) for passing the excitation base (6) and a limiting hole (403) for passing the pull rod (3). The excitation hole (402) is connected to the hook hole (401), and the outer diameter of the support step (601) is larger than the inner diameter of the excitation hole (402).

6. A device for removing a check valve centering sleeve and a valve seat as claimed in claim 5, characterized in that: The inner diameter of the excitation hole (402) is greater than the inner diameter of the limiting hole (403).

7. A device for removing a check valve straightening sleeve and a valve seat as claimed in claim 1, characterized in that: The pull rod (3) and the excitation base (6) are detachably fixedly connected.

8. A device for removing a check valve centering sleeve and a valve seat as claimed in claim 1, characterized in that: The pull rod (3) is sleeved with a support plate (2), and the support plate (2) and the excitation base (6) are respectively located on both sides of the hook pin (5).

9. A device for removing a check valve centering sleeve and a valve seat as claimed in claim 8, characterized in that: An excitation nut (1) is sleeved on the pull rod (3), and the excitation nut (1) and the hook pin (5) are respectively located on two sides of the support plate (2).

10. A method for removing a check valve centering sleeve and a valve seat as claimed in claim 1, characterized in that: The steps include: The excitation base (6) is fixed on the pull rod (3), and the excitation base (6) is inserted into the chamber of the straightening sleeve (7) or the bottom of the valve seat (8) through the pull rod (3); Arrange the hook pin (5) on the excitation base (6) along the circumference of the pull rod (3) so that the guiding inclined surface (603) and the guiding surface (503) are initially in contact, pull the pull rod (3) upward, and drive the hook pin (5) to move radially through the guiding inclined surface (603) and the guiding surface (503) until the hanging step (501) completely enters the hook groove (702) of the straightening sleeve (7) or the hanging step (501) is hung at the bottom of the valve seat (8); The hook pin (5), the excitation base (6) and the straightening sleeve (7) or the valve seat (8) of the component to be removed are all pulled out from the check valve body (9) by means of a pull rod (3).

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