A casing head inner wall drilling and grinding device for oil wellhead

Abstract

The invention discloses a casing head inner wall drilling and grinding device for oil wellhead, comprising a clamping and driving structure, a synchronous drilling and grinding structure fixed inside the clamping and driving structure, the clamping and driving structure comprising a clamping drive component slidably mounted on an adjustable clamping component, and the clamping drive component comprises a driving body with a chuck fixed on one side, and a movable seat is slidably arranged on the driving body, the adjustable clamping component comprises a handwheel connecting shaft with one end fixedly mounted on the movable seat through a bearing seat, and a through-hole disk is penetrated and fixed at one end of the handwheel connecting shaft, and a sliding groove is penetrated on the surface of the through-hole disk, a guide groove is provided inside the through-hole disk, and a guide block is slidably arranged inside the guide groove, and a ratchet that is rotated and adjusted by a torsion spring block is fixed to the bottom of the guide block. The casing head inner wall drilling and grinding device for oil wellhead plays the role of opening and penetration fixing by the through-hole disk.

Description

Technical Field

[0001] The invention relates to the technical field of oil wellheads, in particular to a casing head inner wall drilling and grinding device used for oil wellheads. Background Art

[0002] The casing head is used to fix the wellhead of the drilled well, connect the wellhead casing string, support the gravity of the technical casing and the oil layer casing, seal the annular space between the layers of pipes, and provide a transition connection for installing the blowout preventer, the tubing head, and the Christmas tree. After searching, it was found that the publication number of the existing public technology is: CN117655745A, a casing head drilling and grinding device for an oil wellhead, including a main body, one end of the main body is equipped with a three-jaw chuck, the main body is used to drive the three-jaw chuck to rotate, the other end of the main body is slidably equipped with a moving seat, one end of the moving seat is fixedly connected with a rotating mechanism, the The rotating mechanism includes a fixed rod, and the outer side wall of one end of the fixed rod is rotatably connected to the outer sleeve. In the invention, through the setting of the rotating mechanism, the rotation of the outer sleeve drives the drill rod to revolve through the bracket, so that the drill rod and the casing head rotate synchronously, and because the fixed rod remains stationary, bevel gear one and bevel gear two are meshed, so that when the bracket revolves, the bevel gear two drives the rib rod two to rotate, thereby driving the drill rod to rotate, and under the action of the centrifugal force of the revolution of the drill rod, the rotating fastener and the rib rod two, the drill rod moves outward, so that the drill rod contacts and squeezes the side hole, thereby realizing the drilling and expansion of the inner end of the side hole.

[0003] To sum up: when the above-mentioned background technology drives the drill rod to rotate and slide for drilling through centrifugal force, since both the casing head and the drill rod are affected by the rotating self-rotation force, the drill rod will slide and collide with the inner wall of the casing head when starting to drill. This will not only easily shorten the service life of the drilling, but may also cause collision and fracture of the drill rod head. In addition, in the above-mentioned background technology, when the internal threaded sleeve is rotated, the hand needs to be extended into the casing head to rotate and adjust the internal threaded sleeve. This not only makes the rotation adjustment troublesome, but also easily leads to hand adjustment limit. Summary of the invention

[0004] The purpose of the present invention is to address the deficiencies in the prior art and provide a casing head inner wall drilling and grinding device for an oil wellhead, so as to solve the problem proposed in the above background technology that when the drill rod is driven by centrifugal force to rotate and slide for drilling, the drill rod and the inner wall of the casing head may slide and collide when the drill rod starts drilling because both the casing head and the drill rod are affected by the rotating self-rotation force. This not only easily shortens the service life of the drilling, but may also cause collision and fracture of the drill rod head. In addition, in the above background technology, when the internal threaded sleeve is rotated, the hand needs to be extended into the casing head to adjust the rotation of the internal threaded sleeve. This not only makes the rotation adjustment troublesome, but also easily leads to the hand adjustment limit.

[0005] To achieve the above object, the present invention provides the following technical solutions: a casing head inner wall drilling and grinding device for oil wellheads, comprising a clamping and driving structure, wherein a synchronous drilling and grinding structure is fixed inside the clamping and driving structure;

[0006] The clamping and driving structure includes a clamping driving assembly slidably mounted on the adjusting clamping assembly, and the clamping driving assembly includes a driving body with a chuck fixed on one side, and a moving seat is slidably provided on the driving body;

[0007] The adjusting clamping assembly comprises a hand wheel connecting shaft with one end fixedly mounted on the movable seat through a bearing seat, and a through hole disk is fixedly penetrated at one end of the hand wheel connecting shaft, and a sliding groove is penetrated and opened on the surface of the through hole disk.

[0008] By adopting the above technical solution, the through-hole plate is provided to achieve opening and penetration fixing.

[0009] Preferably, a guide groove is provided inside the through hole disk, and a guide block is slidably provided inside the guide groove, and a ratchet which is rotated and adjusted by a torsion spring block is fixed at the bottom of the guide block, and a pull rod which passes through the through hole disk is fixed at the rear side of the guide block.

[0010] By adopting the above technical solution, the pulling and sliding adjustment is achieved through the provided pull rod.

[0011] Preferably, the through hole disk is rotatably connected to the matching disk by installing a bearing, and a ratchet wheel that engages and adjusts with the ratchet teeth is fixed on the rear side of the matching disk. At the same time, an arc guide groove is opened through the surface of the matching disk. The sliding groove and the arc guide groove are slidably adjusted with the L rod, and a fitting contact block is fixed at one end of the L rod.

[0012] By adopting the above technical solution, the contact pressing and fixing is achieved by providing the fitting contact block.

[0013] Preferably, the synchronous drilling and grinding structure includes a synchronous drive adjustment component installed on the drilling and grinding component, and the synchronous drive adjustment component includes a bearing frame rotatably connected to one end of the handwheel connecting shaft, and an active bevel gear fixedly connected to one end of the handwheel connecting shaft is rotatably installed on the inner side of the bearing frame.

[0014] By adopting the above technical solution, manual rotation adjustment is achieved through the provision of a hand wheel connecting shaft.

[0015] Preferably, a driven bevel gear set meshing with the active bevel gear is provided under the bearing frame, and the driven bevel gear set is fixedly connected to one end of the ball screw, and a ball nut for drive adjustment is provided on the surface of the ball screw, a through-hole mounting plate is fixed on the surface of the ball nut, and racks and connecting rods are respectively penetrated on both sides of the through-hole mounting plate, and one end of the rack and the connecting rod is fixedly connected to the bottom of the bearing frame.

[0016] By adopting the above technical solution, the ball screw is provided to achieve lifting and lowering adjustment limit.

[0017] Preferably, the drilling and grinding assembly includes a bearing cylinder wrapped around the bottom of the ball nut, and a bevel gear set is rotatably installed inside the bearing cylinder, and a gear meshing with the rack is fixed to the rear side of the bevel gear set, and another chuck is fixed to the bottom of the bevel gear set, and a drill bit and a grinding head are respectively fixed to the other chuck.

[0018] By adopting the above technical solution, the meshing rotation adjustment is achieved through the arranged gears.

[0019] Preferably, six sliding grooves are provided, and the sliding grooves are provided in a circular array about the through-hole disk.

[0020] By adopting the above technical solution, the sliding groove is provided to play a guiding and sliding adjustment role.

[0021] Preferably, the overall shape of the bearing frame is an "open" structure.

[0022] By adopting the above technical solution, the bearing frame is arranged to achieve matching rotation installation and synchronous force rotation adjustment.

[0023] Preferably, the connection shape between the ball nut and the through hole mounting plate is arranged in a concentric circle structure.

[0024] By adopting the above technical solution, the through-hole mounting plate is provided to achieve synchronous lifting and lowering adjustment.

[0025] Compared with the prior art, the invention has the following beneficial effects: the inner wall drilling and grinding device for the casing head used for the oil wellhead is

[0026] (1) The present application solves the problem that when the drill rod is driven by centrifugal force to perform rotational sliding drilling, the casing head and the drill rod are both affected by the self-rotation force of rotation, which may cause the drill rod to slide and collide with the inner wall of the casing head when starting drilling. When the bearing frame extends to the inner wall of the casing head, the operator rotates the handwheel connecting shaft. When the handwheel connecting shaft is rotated under force, the active bevel gear is driven to rotate under force. When the active bevel gear is rotated under force, the driven bevel gear group drives the ball screw to rotate synchronously under force. When the ball screw is rotated under force, the drill bit and the grinding head are both in contact with the inner wall hole of the casing head, thereby avoiding the situation of rotational centrifugation when the drill bit and the grinding head are rotated under force again. In addition, the positioning drilling and grinding is effectively performed when the drill bit and the grinding head are first in contact with the inner wall hole of the casing head.

[0027] (2) By adjusting the clamping assembly provided in the clamping assembly, the problem in the above-mentioned background technology that the internal threaded sleeve needs to be rotated by extending the hand inside the casing head before the internal threaded sleeve can be rotated and adjusted is solved. This not only makes the rotation adjustment troublesome, but also easily leads to the situation that the hand adjustment is limited. When the inner wall of the casing head needs to be contacted and limited, the operator manually rotates the handwheel connecting shaft to drive the matching disk to rotate under force. When the matching disk is rotated under force, the ratchet and the L rod are driven to move synchronously under force. When the L rod and the ratchet are driven to rotate synchronously under force, the fitting contact block is fitted with the inner wall of the casing head and the contact limit is made. In addition, when the handwheel connecting shaft is driven to rotate synchronously under force, the active bevel gear is driven to rotate synchronously under force, which facilitates the drill bit and the grinding head to contact and fit with the inner wall hole of the casing head first;

[0028] (3) By adjusting the guide groove, guide block, torsion spring block, ratchet and pull rod provided in the clamping assembly, the problem of the inability to force the fitting contact block to fit the inner wall hole of the casing head again by the hand wheel connecting shaft after the fitting contact block is in contact with the through hole disk and separated from the inner wall of the casing head is solved. When the inner wall of the casing head is separated from the fitting contact block, the operator pulls the pull rod to drive the guide block, torsion spring block and ratchet to be separated from the guide groove and ratchet. When the ratchet is separated from the ratchet, it is convenient to rotate the hand wheel connecting shaft so that the fitting contact block, drill bit and grinding head are synchronously adjusted and stored and separated from the inner wall of the casing head;

[0029] (4) The drilling and grinding assembly provided in the synchronous drilling and grinding structure solves the problem that the drill bit and the grinding head cannot be synchronously driven for drilling and grinding. When the ball nut is subjected to force lifting and adjustment, the bearing cylinder is driven to move synchronously. When the bearing cylinder is subjected to force movement synchronously, the gear and the rack are driven to mesh and rotate. When the gear meshes and rotates, the bevel gear set is driven to rotate synchronously. When the bevel gear set is driven to rotate synchronously, the drill bit and the grinding head are driven to rotate synchronously. When the drill bit and the grinding head are subjected to force rotation synchronously, the inner wall hole of the casing head is synchronously drilled and synchronously polished.

[0030] (5) By adjusting the ratchet, torsion spring block and ratchet wheel set in the clamping assembly, the matching disk cannot be adjusted to a limited position after being rotated under force, which also causes the drill bit and the grinding head to be unable to be adjusted to a limited position. When the matching disk is rotated under force, the ratchet wheel is driven to move relative to the ratchet and torsion spring block under force rotation. When the ratchet wheel stops rotating, the ratchet wheel has a rotation limiting effect on the ratchet wheel, thereby avoiding the above-mentioned problem. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] Figure 1 It is a schematic diagram of the front cross-sectional structure of the present invention;

[0032] Figure 2 It is a schematic diagram of the clamping and driving structure of the present invention;

[0033] Figure 3 It is a schematic diagram of the structure of the clamping drive assembly of the present invention;

[0034] Figure 4 It is a schematic diagram of the structure of the hand wheel connecting shaft, the pull rod and the fitting contact block of the present invention;

[0035] Figure 5 It is a schematic diagram of the structure of the through-hole plate, the sliding groove, the ratchet, the L-rod and the fitting contact block of the present invention;

[0036] Figure 6 For the present invention Figure 5 The enlarged structural diagram at A in the middle;

[0037] Figure 7 This is a schematic diagram of the structure of the matching disc, ratchet and arc-shaped guide groove of the present invention;

[0038] Figure 8 This is a schematic diagram of the synchronous drilling and grinding structure of the present invention;

[0039] Fig. 9 This is a schematic diagram of the structure of the synchronous drive adjustment component of the present invention;

[0040] Fig.10 It is a schematic diagram of the structure of the bearing cylinder, the bevel gear set, the drill bit and the grinding head of the present invention;

[0041] Fig.11 This is a schematic diagram of the bearing cylinder structure of the present invention;

[0042] Fig.12 It is a schematic diagram of the bevel gear set and gear structure of the present invention.

[0043] In the figure: 1. Clamping and driving structure; 101. Clamping and driving assembly; 1011. Driving body; 1012. Chuck; 1013. Moving seat; 102. Adjusting clamping assembly; 1021. Hand wheel connecting shaft; 1022. Through hole plate; 1023. Sliding groove; 1024. Guide groove; 1025. Guide block; 1026. Torsion spring block; 1027. Ratchet; 1028. Pull rod; 1029. Matching plate; 10210. Ratchet; 10211. Arc guide groove; 10212. L rod; 1 0213, fitting contact block; 2, synchronous drilling and grinding structure; 201, synchronous drive adjustment assembly; 2011, bearing frame; 2012, active bevel gear; 2013, driven bevel gear set; 2014, ball screw; 2015, ball nut; 2016, through hole mounting plate; 2017, rack; 2018, connecting rod; 202, drilling and grinding assembly; 2021, bearing cylinder; 2022, bevel gear set; 2023, gear; 2024, drill bit; 2025, grinding head. DETAILED DESCRIPTION

[0044] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions 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 in the invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0045] See also Figure 1-12 The present invention provides a technical solution: a casing head inner wall drilling and grinding device for oil wellhead, such as Figure 1 , Figure 2 and Figure 3 As shown, it includes a clamping and driving structure 1, which includes a clamping and driving component 101 that is slidably installed on an adjustable clamping component 102, and the clamping and driving component 101 includes a driving body 1011 with a chuck 1012 fixed on one side, and a movable seat 1013 is slidably provided on the driving body 1011, wherein the above-mentioned components all adopt the component installation arrangement in the background technology, and the component installation arrangement in the background technology is used to effectively clamp and fix the casing head and adjust the synchronous force rotation.

[0046] In the above scheme, the operator clamps and fixes the casing head with the chuck 1012 and then pushes the movable seat 1013 to drive the synchronous drilling and grinding structure 2 to extend inside the casing head for contact and fit.

[0047] like Figure 4 , Figure 5 , Figure 6 and Figure 7 As shown, the adjusting clamping assembly 102 includes a handwheel connecting shaft 1021 with one end fixedly installed through a bearing seat and a movable seat 1013, and a through-hole disk 1022 is passed through and fixed at one end of the handwheel connecting shaft 1021, and a sliding groove 1023 is opened through the surface of the through-hole disk 1022, and 6 sliding grooves 1023 are opened, and the sliding grooves 1023 are opened in a circular array about the through-hole disk 1022. When 6 sliding grooves are opened through the above structure, it not only reflects the equidistant distribution of the opening and setting of the above structure, but also reflects the practicality and sliding guide adjustability of the opening and setting of the above structure. In addition, when 6 sliding grooves are opened through the above structure, the axial and longitudinal axis symmetry of the above structure about the through-hole disk 1022 and the aesthetics of the overall opening and setting are reflected.

[0048] The above scheme further provides a guide groove 1024 inside the through-hole disk 1022, and a guide block 1025 is slidably provided inside the guide groove 1024, and a ratchet 1027 which is rotationally adjusted by a torsion spring block 1026 is fixed to the bottom of the guide block 1025, and a pull rod 1028 which passes through the through-hole disk 1022 is fixed to the rear side of the guide block 1025, wherein the above-mentioned components constitute a pulling and sliding adjustment structure, and the pulling and sliding adjustment structure constituted by the above-mentioned components can effectively change the relative sliding engagement adjustment distance between the torsion spring block 1026 and the ratchet 1027 and the ratchet 10210, and by changing the relative engagement sliding interval distance between the ratchet 10210 and the ratchet 1027, the matching disk 1029 is rotationally limited and rotated to loosen.

[0049] Furthermore, the through hole disk 1022 is rotatably connected to the matching disk 1029 by installing a bearing, and a ratchet 10210 that meshes and adjusts with the ratchet 1027 is fixed to the rear side of the matching disk 1029, and an arc guide groove 10211 is opened through the surface of the matching disk 1029, and the sliding groove 1023 and the arc guide groove 10211 are slidably adjusted with the L rod 10212, and a fitting contact block 10213 is fixed to one end of the L rod 10212, wherein the above-mentioned components constitute a rotating lifting and sliding structure, and the rotating lifting and sliding specific structure constituted by the above-mentioned components is used to effectively and synchronously change the synchronous lifting and sliding interval distance of the L rod 10212 and the fitting contact block 10213 so that the fitting contact block 10213 is fitted, contacted and fixed to the inner wall of the casing head.

[0050] like Figure 8 and Fig. 9 As shown, a synchronous drilling and grinding structure 2 is fixed inside the clamping and driving structure 1, and the synchronous drilling and grinding structure 2 includes a synchronous drive adjustment component 201 installed on the drilling and grinding component 202, and the synchronous drive adjustment component 201 includes a bearing frame 2011 rotatably connected to one end of the handwheel connecting shaft 1021, and at the same time, an active bevel gear 2012 fixedly connected to one end of the handwheel connecting shaft 1021 is rotatably installed on the inner side of the bearing frame 2011, and the overall shape of the bearing frame 2011 is set in an "open" structure. When the overall shape of the above-mentioned parts is set in an "open" structure, it not only reflects the through-matching connectivity of the above-mentioned structure, but also reflects the axial symmetrical installation of the above-mentioned structure. When the above-mentioned structure is set in an "open" structure, it also reflects the simplicity of the overall setting of the above-mentioned parts and the relative rotation adjustability of the matching connection.

[0051] In the above scheme, a driven bevel gear set 2013 meshing with the active bevel gear 2012 is provided below the bearing frame 2011, and the driven bevel gear set 2013 is fixedly connected to one end of the ball screw 2014, and a ball nut 2015 for driving adjustment is provided on the surface of the ball screw 2014, and a through-hole mounting plate 2016 is fixed on the surface of the ball nut 2015, and the connection shape of the ball nut 2015 and the through-hole mounting plate 2016 is arranged in a concentric circle structure. When the above two are arranged in a concentric circle structure, this not only reflects the concentric and coaxial matching installation of the above two, but also The synchronous force-driven adjustability of the above-mentioned two matching installations is reflected, and when the above-mentioned two are arranged in a concentric circle structure, the practicality and through-lifting adjustability of the above-mentioned two matching installations are reflected, and racks 2017 and connecting rods 2018 are respectively penetrated on both sides of the through-hole mounting plate 2016, and at the same time, one end of the rack 2017 and the connecting rod 2018 are fixedly connected to the bottom of the bearing frame 2011, wherein the above-mentioned components constitute an engaged relative rotation adjustment structure, and when the engaged relative rotation adjustment structure constituted by the above-mentioned components is utilized, the synchronous lifting and lowering drive adjustment distance of the ball nut 2015 is effectively changed.

[0052] like Fig.10 , Fig.11 and Fig.12 As shown, the drilling and grinding assembly 202 includes a bearing cylinder 2021 wrapped around the bottom of the ball nut 2015, and a bevel gear set 2022 is rotatably installed inside the bearing cylinder 2021. At the same time, a gear 2023 meshing with the rack 2017 is fixed to the rear side of the bevel gear set 2022, and another chuck 1012 is fixed to the bottom of the bevel gear set 2022, and a drill bit 2024 and a grinding head 2025 are respectively fixed to the other chuck 1012.

[0053] In the above scheme, the bearing frame 2011 extends behind the inner wall of the casing head. At this time, the operator rotates the handwheel connecting shaft 1021. When the handwheel connecting shaft 1021 is rotated under force, the active bevel gear 2012 and the matching disk 1029 are driven to rotate synchronously. When the active bevel gear 2012 is rotated under force, the driven bevel gear set 2013 drives the ball screw 2014 to rotate synchronously under force. When the ball screw 2014 is rotated under force, the ball nut 2015, the through-hole mounting disk 2016 and the bearing cylinder 2021 are driven to move synchronously under force. When the bearing cylinder 2021 is driven to move under force, the drill bit 2024 is driven to rotate synchronously. and the grinding head 2025 are in close contact with the inner wall hole of the casing head. When the matching disk 1029 is rotated under force, the L rod 10212 and the fitting contact block 10213 are driven to move synchronously under force. After the fitting contact block 10213 is moved under force and is fixed in close contact with the inner wall of the casing head, the operator controls the driving body 1011 to drive the fitting contact block 10213 and the handwheel connecting shaft 1021 to rotate synchronously under force. When the handwheel connecting shaft 1021 is rotated under force, the active bevel gear 2012 is used to drive the drill bit 2024 and the grinding head 2025 to rotate synchronously under force to expand and grind the inner wall hole of the casing head simultaneously.

[0054] The directions or positional relationships indicated by terms such as "center", "longitudinal", "lateral", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside" and "outside" are based on the directions or positional relationships shown in the accompanying drawings. They are merely simplified descriptions for the convenience of describing the present invention, and do not indicate or imply that the devices or elements referred to must have a specific direction, be constructed and operated in a specific direction. Therefore, they should not be understood as limitations on the protection content of the present invention.

[0055] Although the present invention has been described in detail with reference to the aforementioned embodiments, it is still possible for those skilled in the art to modify the technical solutions described in the aforementioned embodiments, or to make equivalent substitutions for some of the technical features therein. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A casing head inner wall drilling and grinding device for oil wellhead, characterized in that: It comprises a clamping and driving structure (1), wherein a synchronous drilling and grinding structure (2) is fixed inside the clamping and driving structure (1); The clamping driving structure (1) comprises a clamping driving component (101) slidably mounted on the adjusting clamping component (102), and the clamping driving component (101) comprises a driving body (1011) with a chuck (1012) fixed on one side, and a moving seat (1013) is slidably provided on the driving body (1011); The adjusting clamping assembly (102) comprises a hand wheel connecting shaft (1021) having one end fixedly mounted via a bearing seat and a movable seat (1013), and a through hole plate (1022) is fixedly passed through one end of the hand wheel connecting shaft (1021), and a sliding groove (1023) is formed on the surface of the through hole plate (1022); A guide groove (1024) is provided inside the through-hole disk (1022), and a guide block (1025) is slidably provided inside the guide groove (1024), and a ratchet (1027) that is rotatably adjusted by a torsion spring block (1026) is fixed at the bottom of the guide block (1025), and a pull rod (1028) that passes through the through-hole disk (1022) is fixed at the rear side of the guide block (1025); The through-hole disk (1022) is rotatably connected to the matching disk (1029) by installing a bearing, and a ratchet (10210) that meshes and adjusts with the ratchet (1027) is fixed on the rear side of the matching disk (1029), and an arc-shaped guide groove (10211) is opened through the surface of the matching disk (1029), and the sliding groove (1023) and the arc-shaped guide groove (10211) are slidably adjusted with the L rod (10212), and a fitting contact block (10213) is fixed on one end of the L rod (10212); The synchronous drilling and grinding structure (2) comprises a synchronous drive adjustment component (201) mounted on the drilling and grinding component (202), and the synchronous drive adjustment component (201) comprises a bearing frame (211) rotatably connected to one end of the hand wheel connecting shaft (1021), and an active bevel gear (2012) fixedly connected to one end of the hand wheel connecting shaft (1021) is rotatably mounted inside the bearing frame (2011); A driven bevel gear set (2013) meshingly connected with the driving bevel gear (2012) is provided below the bearing frame (2011), and the driven bevel gear set (2013) is fixedly connected to one end of a ball screw (2014), and a drive-adjustable ball nut (2015) is provided on the surface of the ball screw (2014), a through-hole mounting plate (2016) is fixed on the surface of the ball nut (2015), and a rack (2017) and a connecting rod (2018) are respectively penetrated on both sides of the through-hole mounting plate (2016), and one end of the rack (2017) and the connecting rod (2018) are fixedly connected to the bottom of the bearing frame (2011); The drilling and grinding assembly (202) comprises a bearing cylinder (2021) wrapped and connected to the bottom of the ball nut (2015), and a bevel gear set (2022) is rotatably mounted inside the bearing cylinder (2021), and a gear (2023) meshingly connected to the rack (2017) is fixed to the rear side of the bevel gear set (2022), and another chuck (1012) is fixed to the bottom of the bevel gear set (2022), and a drill bit (2024) and a grinding head (2025) are respectively fixed to the other chuck (1012).

2. The casing head inner wall drilling and grinding device for oil wellhead according to claim 1, characterized in that: The sliding grooves (1023) are provided in six numbers, and the sliding grooves (1023) are provided in a circular array with respect to the through-hole disk (1022).

3. The casing head inner wall drilling and grinding device for oil wellhead according to claim 1, characterized in that: The overall shape of the bearing frame (2011) is an "open" structure.

4. The casing head inner wall drilling and grinding device for oil wellhead according to claim 1, characterized in that: The ball nut (2015) and the through-hole mounting plate (2016) are connected in a concentric circle structure.

Images