An underreamer for oil and gas drilling

Abstract

The utility model discloses an eye -expanding device for oil and natural gas drilling, include: the connecting pipe, and its top and bottom end all are fixedly connected with the drill piece joint, the circular cover is fixedly covered in the connecting pipe outside, and its four sides all are equipped with the rectangular accommodating groove, and its bottom is provided as the conical structure, and the outside fixed connection of conical structure has a plurality of first eye -expanding drill tooth. The utility model discloses through setting up a series of structures, and it is convenient to flexibly adjust the drilling size according to the eye -expanding demand, improves the use flexibility and applicability, reduces the equipment amount of different size reaming bit, and utilizes the novel design mode that thread drive part and horizontal guide and spring structure are all integrally hidden, effectively avoided the phenomenon that the driving structure spare such as thread spare exposed setting is easy to be jammed or the collision damage of soil impurity, facilitates subsequent again stable adjustment application, improves long -term use stability and life, and subsequent simple flushing outer surface can maintain the cleaning effect, improves subsequent cleaning convenience.

Description

Technical Field

[0001] This utility model relates to the field of oil and gas drilling technology, specifically to a borehole reamer for oil and gas drilling. Background Technology

[0002] In oil and gas drilling, reaming devices play a crucial role in drilling engineering. Their main function is to enlarge the diameter of the drilled wellbore by installing and operating specific tools within the wellbore, thereby meeting the wellbore design and production requirements. Reaming while drilling (WD) is a drilling technique that uses reaming tools and conventional drill bit programs to enlarge the wellbore and trim the wellbore wall while drilling. The reaming device is typically installed between the drill bit and the drill pipe, with a diameter larger than the drill bit diameter. As the lower drill bit drills, the upper reaming device simultaneously performs reaming and wellbore trimming. Different reaming diameters require different specifications of reaming drill bits, which undoubtedly leads to an excessive number of reaming drill bits, resulting in higher costs and potential mismatches in specifications.

[0003] A search revealed that CN222436297U discloses a reaming device for oil and gas drilling, comprising a drill pipe, a reaming assembly on the outer side of the drill pipe, a first mounting bracket fixedly connected to the top of the drill pipe, a lead screw fixedly connected to the top of the first mounting bracket, a second mounting bracket slidably connected to the middle of the lead screw, a bolt rotatably connected to the bottom of the second mounting bracket, the bolt being threadedly connected to the lead screw, and a limit bracket slidably connected to the outer side of the top of the lead screw. By controlling the tilt angle of the reaming plate, the reaming diameter can be adjusted, allowing the device to be adjusted according to specific drilling needs and adapt to different well diameters. This flexibility is particularly important because it allows the same equipment to be used in various different drilling environments, reducing equipment requirements and replacement costs.

[0004] The aforementioned technology discloses an reaming device for oil and gas drilling, which uses a screw and other structures in the middle, along with reaming plates on four sides, to adjust the drilling and reaming diameter formed by the four reaming plates, improving applicability and reducing the number of drill bits required for different reaming diameters. However, this adjustment method has the following significant drawbacks: This simple adjustment method, which uses a screw exposed in the middle, allows soil impurities to easily get stuck inside during reaming drilling, causing damage or jamming of the screw, making subsequent stable adjustment difficult. It lacks a safe and stable reaming adjustment mechanism, resulting in poor long-term stability and lifespan; and it also makes subsequent cleaning difficult. Therefore, this application proposes an reaming device for oil and gas drilling to solve the above-mentioned problems. Utility Model Content

[0005] The purpose of this invention is to provide a borehole reamer for oil and gas drilling to solve the problems mentioned in the background art.

[0006] To achieve the above objectives, this utility model provides the following technical solution: a borehole reaming device for oil and gas drilling, comprising:

[0007] The connecting pipe has drill joints fixedly connected to its top and bottom ends; the two drill joints are used to connect the external drilling rig drill bit and the drill pipe respectively, and the connecting pipe is located between the external drilling rig drill bit and the drill pipe.

[0008] A circular sleeve is fixedly fitted on the outside of the connecting pipe. Rectangular receiving grooves are opened on all four sides of the sleeve. The bottom of the sleeve is set as a conical structure. Multiple first reaming drill teeth are fixedly connected to the outside of the conical structure.

[0009] The expansion seats consist of four sets, which are slidably fitted into the corresponding rectangular receiving slots. The opposing sides of the two opposite expansion seats are both set as inclined surfaces. The two opposite inclined surfaces are symmetrically arranged and each is fixedly connected with multiple second reaming drill teeth.

[0010] The transverse missile linear pull-back assembly consists of four sets, each fixedly connected to the inner wall of the corresponding rectangular receiving groove on the side away from its opening, and each connected to the corresponding expansion seat.

[0011] The four-point linkage vertical drive assembly is fixedly connected to the top of the circular sleeve. Each of its four bottom sides has an inclined connecting rod rotatably mounted. Two opposite connecting rods are symmetrically arranged. The four expansion seats are rotatably mounted on the bottom of the corresponding connecting rods on their adjacent sides. The four-point linkage vertical drive assembly is used to drive the four connecting rods to rotate synchronously downward or upward. When the four connecting rods rotate downward, they drive the four expansion seats to expand and slide synchronously outward in the four rectangular receiving slots. When rotating upward, they are used to pull the four expansion seats to retract and move inward. The lateral elastic pull-back assembly is used to guide the corresponding expansion seats laterally and store elastic energy when they move outward. It is also used to elastically assist the expansion seats in repositioning when pulled back.

[0012] Preferably, the transverse guide linear pull-back assembly includes two transverse guide rods and a spring. The inner wall of the rectangular receiving groove away from its opening is fixedly connected to the corresponding two transverse guide rods and the spring ends. The expansion seat is slidably sleeved on the corresponding two transverse guide rods. The expansion seat has a groove on the side near the connecting pipe. The end of the spring away from the connecting pipe is fixedly connected to the inner wall of the corresponding groove away from its opening.

[0013] Preferably, the four-point linkage vertical drive assembly includes a circular cover, an internal gear ring, four gears, four screws, four L-shaped rods, and an internal hexagonal rotating sleeve. The bottom of the circular cover is open and fixedly connected to the top of the circular sleeve. The circular cover is fixedly sleeved on the connecting pipe. The four screws are rotatably installed in a ring between the top of the circular sleeve and the inner wall of the top of the circular cover. The internal gear ring is rotatably installed on the inner wall of the top of the circular cover. The four gears are meshed in a ring at equal intervals on the inner side of the internal gear ring. The four gears are respectively fixedly sleeved on the corresponding screws. The top of the screw on the left extends to the top of the circular cover and is fixedly connected to the bottom of the internal hexagonal rotating sleeve. The outer side of the internal hexagonal rotating sleeve is set as a hexagonal structure. The four L-shaped rods are respectively threaded onto the corresponding screws. The bottom ends of the four L-shaped rods slide into the corresponding rectangular receiving grooves. The bottom of the four L-shaped rods on the opposing sides are rotatably installed with the top of the corresponding connecting rods. The four horizontal guide rods located above are respectively movably sleeved on the corresponding L-shaped rods.

[0014] Preferably, the expansion seat has two transverse guide grooves on the side near the connecting pipe, which are respectively slidably fitted onto the outer side of the corresponding transverse guide rod.

[0015] Preferably, the top of the L-shaped rod has a threaded hole that is threaded to the corresponding screw.

[0016] Preferably, the top inner wall of the rectangular receiving groove is provided with a rectangular guide hole that slides onto the outer side of the corresponding L-shaped rod.

[0017] Preferably, the top of the upper horizontal guide rod has a rectangular through hole, and the side of the rectangular through hole near the connecting pipe is set as an opening. The L-shaped rod is located in the corresponding rectangular through hole and is in movable contact with its inner wall.

[0018] Compared with the prior art, the beneficial effects of this utility model are:

[0019] 1. Through the combination of the connecting pipe, circular sleeve, first reaming drill bit, expansion seat, second reaming drill bit, rectangular receiving groove, connecting rod, horizontal linear pull-back assembly and four-point linkage vertical drive assembly, the drilling and reaming size can be flexibly adjusted according to the reaming requirements, improving the flexibility and applicability of use, and reducing the amount of reaming drill bits of different sizes required.

[0020] 2. In addition, the new design method of integrating and hiding the threaded drive components, transverse guides and spring structures effectively avoids the phenomenon that exposed drive components such as threaded components are easily blocked by soil impurities or damaged by collisions, which facilitates subsequent stable adjustment and application, and improves long-term stability and lifespan.

[0021] 3. In addition, by using a design where the screw and other driving components are all safely hidden, the outer surface only needs to be rinsed to maintain the cleaning effect, thus improving the convenience of subsequent cleaning.

[0022] This utility model features a series of structures that allow for flexible adjustment of drilling and reaming dimensions according to reaming requirements, improving usability and applicability, reducing the number of reaming drill bits of different sizes required, and utilizing a novel design that integrates and conceals the threaded drive components, transverse guide, and spring structure. This effectively avoids the problem of exposed drive components such as threaded parts being easily blocked or damaged by soil impurities or collisions, facilitating subsequent stable adjustments and applications, improving long-term stability and lifespan, and allowing for easy cleaning of the outer surface with simple rinsing. Attached Figure Description

[0023] Figure 1 This is a schematic diagram of the structure of an oil and gas drilling reamer proposed in this utility model;

[0024] Figure 2 This is a schematic diagram of the front cross-sectional structure of an oil and gas drilling reamer proposed in this utility model;

[0025] Figure 3 This is a three-dimensional structural diagram of the internal gear ring, gear, screw, and internal hexagonal swivel connecting component of an oil and gas drilling reamer proposed in this utility model.

[0026] In the diagram: 1. Connecting pipe; 2. Circular sleeve; 201. First reaming drill bit; 202. Rectangular receiving groove; 3. Expanding seat; 301. Second reaming drill bit; 302. Horizontal guide rod; 303. Spring; 304. Rectangular through hole; 305. Connecting rod; 4. Circular cover; 401. Screw; 402. Gear; 403. Internal gear ring; 404. Internal hexagonal swivel sleeve; 405. L-shaped rod. Detailed Implementation

[0027] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0028] like Figures 1 to 3 As shown in this embodiment, a borehole reamer for oil and gas drilling includes:

[0029] Connecting pipe 1 has drill joints fixedly connected to its top and bottom ends; the two drill joints are used to connect the external drilling rig drill bit and the drill pipe respectively, and connecting pipe 1 is located between the external drilling rig drill bit and the drill pipe.

[0030] A circular sleeve 2 is fixedly sleeved on the outside of the connecting pipe 1. Rectangular receiving grooves 202 are provided on all four sides of the sleeve. The bottom of the sleeve is set as a conical structure. Multiple first reaming drill teeth 201 are fixedly connected to the outside of the conical structure.

[0031] There are four sets of expansion seats 3, which are slidably fitted into the corresponding rectangular receiving grooves 202. The opposing sides of two opposite expansion seats 3 are both set as inclined surfaces. The two opposite inclined surfaces are symmetrically arranged and each is fixedly connected with multiple second reaming drill teeth 301.

[0032] The transverse missile linear pull-back assembly consists of four sets, which are respectively fixedly connected to the inner wall of the corresponding rectangular receiving groove 202 on the side away from its opening, and are respectively connected to the corresponding expansion seat 3.

[0033] The four-point linkage vertical drive assembly is fixedly connected to the top of the circular sleeve 2. Each of its four bottom sides is rotatably mounted with inclined connecting rods 305. Two opposite connecting rods 305 are symmetrically arranged. The four expansion seats 3 are rotatably mounted on the bottom of the corresponding connecting rods 305 on their adjacent sides. The four-point linkage vertical drive assembly is used to drive the four connecting rods 305 to rotate downward or upward synchronously. When the four connecting rods 305 rotate downward, they drive the four expansion seats 3 to expand and slide outward synchronously in the four rectangular receiving slots 202. When rotating upward, they are used to pull the four expansion seats 3 to retract and move inward. The lateral elastic pull-back assembly is used to guide the corresponding expansion seat 3 laterally and store elastic energy when it moves outward. It is also used to elastically assist the expansion seat 3 to move back and reset when pulled back.

[0034] Furthermore, such as Figure 2 As shown, the transverse guide linear pull-back assembly includes two transverse guide rods 302 and a spring 303. The inner wall of the rectangular receiving groove 202 away from its opening is fixedly connected to the ends of the corresponding two transverse guide rods 302 and the spring 303. The expansion seat 3 is slidably sleeved on the corresponding two transverse guide rods 302. The expansion seat 3 has a groove on the side near the connecting pipe 1. The end of the spring 303 away from the connecting pipe 1 is fixedly connected to the inner wall of the corresponding groove away from its opening.

[0035] In this embodiment, the expansion seat 3 has two horizontal guide grooves on the side near the connecting pipe 1, which are respectively slidably fitted to the outer side of the corresponding horizontal guide rod 302, so as to guide the expansion seat 3 to slide laterally.

[0036] In this embodiment, two horizontal guide rods 302 and springs 303 work together. The two horizontal guide rods 302 guide the corresponding expansion seat 3 laterally when it moves laterally. The springs 303 are stretched and store elastic energy when the corresponding expansion seat 3 expands outward. The stretched springs 303 are then elastically pulled back when the expansion seat 3 is pulled back, driving it to move back and reset. This achieves the effect of guiding the four expansion seats 3 laterally and assisting in their subsequent retraction.

[0037] Furthermore, such as Figure 1 , 2 As shown in Figure 3, the four-point linkage vertical drive assembly includes a circular cover 4, an internal gear ring 403, four gears 402, four screws 401, four L-shaped rods 405, and an internal hexagonal swivel sleeve 404. The bottom of the circular cover 4 is open and fixedly connected to the top of the circular sleeve 2. The circular cover 4 is fixedly sleeved on the connecting pipe 1. The four screws 401 are rotatably mounted in a ring between the top of the circular sleeve 2 and the inner wall of the top of the circular cover 4. The internal gear ring 403 is rotatably mounted on the inner wall of the top of the circular cover 4. The four gears 402 are meshed in a ring with equal intervals inside the internal gear ring 403. The four gears 402 are respectively fixedly sleeved on the connecting pipe 1. The screw 401 is located on the corresponding screw 401. The top of the screw 401 on the left extends to the top of the round cover 4 and is fixedly connected to the bottom of the internal hexagonal sleeve 404. The outer side of the internal hexagonal sleeve 404 is set as a hexagonal structure. Four L-shaped rods 405 are threaded on the corresponding screw 401 respectively. The bottom ends of the four L-shaped rods 405 slide into the corresponding rectangular receiving grooves 202 respectively. The bottom of the four L-shaped rods 405 on the opposing side is rotatably installed with the top of the corresponding connecting rod 305 respectively. The four horizontal guide rods 302 located above are movably sleeved on the corresponding L-shaped rods 405 respectively.

[0038] In this embodiment, the top of the L-shaped rod 405 is provided with a threaded hole that is threadedly connected to the corresponding screw 401. The threaded connection between the screw 401 and the threaded hole facilitates the upward and downward displacement of the corresponding L-shaped rod 405 when the screw 401 rotates. The top inner wall of the rectangular receiving groove 202 is provided with a rectangular guide hole that slides and fits on the outer side of the corresponding L-shaped rod 405, which serves to guide the vertical sliding of the L-shaped rod 405. The top of the horizontal guide rod 302 located above is provided with a rectangular through hole 304. The side of the rectangular through hole 304 near the connecting pipe 1 is set as an opening. The L-shaped rod 405 is located in the corresponding rectangular through hole 304 and is in movable contact with its inner wall. The rectangular through hole 304 is provided for the corresponding L-shaped rod 405 to pass through.

[0039] In this embodiment, the top of the circular sleeve 2 is fixedly connected with four first bearings at equal intervals in a ring shape. The top of the circular cover 4 has four first circular holes in a ring shape. Second bearings are fixedly fitted inside the first circular holes. The inner side of the inner ring of the second bearing and the inner side of the inner ring of the first bearing are fixedly connected to the outer side of the corresponding screw 401, so as to achieve the effect of rotating and installing the screw 401. The top inner wall of the circular cover 4 is fixedly connected with a third bearing. The inner ring of the third bearing is fixedly fitted to the outer side of the internal gear ring 403, so as to achieve the effect of rotating and installing the internal gear ring 403. The top of the circular cover 4... A second circular hole is provided in the middle for fixed connection with the outside of the connecting pipe 1; a rectangular groove is provided on the side of the expansion seat 3 near the connecting pipe 1; two stainless steel supports are fixedly connected to the bottom of the four L-shaped rods 405 on the opposing side; stainless steel shafts are fixedly connected between the two stainless steel supports on the same side and between the inner walls of the front and rear sides of the rectangular groove; a third circular hole is provided on the top and bottom of one side of the connecting rod 305; a fourth bearing is fixedly fitted in the third circular hole; the inner ring of the fourth bearing is fixedly fitted to the outer side of the corresponding stainless steel shaft, so as to achieve the effect of rotating the connecting rod 305.

[0040] In this embodiment, the circular cover 4, internal gear ring 403, four gears 402, four screws 401, four L-shaped rods 405, and internal hexagon socket 404 work together. Using an external internal hexagon socket or wrench to rotate the internal hexagon socket 404, it drives the left screw 401 to rotate. The left screw 401 drives the left gear 402 to rotate, which in turn drives the internal gear ring 403 to rotate. The internal gear ring 403 then drives the other three gears 402 meshing with it to rotate, which in turn drives the other three screws 401 to rotate. This results in the four screws 401 rotating synchronously, and the rotation of the four screws 401 drives the four L-shaped rods 405... 05. The four L-shaped rods 405 drive the four connecting rods 305 to rotate synchronously downwards or upwards. When the four connecting rods 305 rotate downwards, they drive the four expansion seats 3 to slide synchronously outwards within the four rectangular receiving slots 202. The four expansion seats 3 drive multiple second reaming drill teeth 301 to move outwards to increase and adjust the reaming size, achieving the effect of flexibly adjusting the drilling and reaming size according to the reaming requirements, improving the flexibility and applicability of use, and reducing the number of reaming drill bits of different sizes required. When the four connecting rods 305 rotate upwards, they pull and drive the four expansion seats 3 to retract inwards.

[0041] It should be noted that: the circular sleeve 2, the expansion seat 3, the connecting rod 305, the horizontal guide rod 302, the circular cover 4, the internal gear ring 403, the gear 402, the screw 401, the L-shaped rod 405, and the internal hexagonal swivel sleeve 404 are all preferably made of stainless steel. The screw 401 has a high wear-resistant load-bearing specification with a thread clearance of 1-2mm on the outer side. The stainless steel material has the advantages of high hardness, high wear resistance, and good maintenance-free effect, which ensures long-term connection and drive support stability.

[0042] The method of use in this embodiment is as follows: When using the reaming device for oil and gas drilling, the connecting pipe 1 is connected between the external drill bit and the drill pipe. During oil and gas drilling and reaming, when the drill bit of the drill bit is drilled by the drill driving the connecting pipe 1 to rotate, the connecting pipe 1 drives the circular sleeve 2 to move and rotate. The circular sleeve 2 drives multiple first reaming drill teeth 201 to rotate to perform preliminary drilling and reaming. The circular sleeve 2 also drives four expansion seats 3 to rotate. When the four expansion seats 3 drive multiple second reaming drill teeth 301 to rotate and move downward, they perform further drilling, thus achieving the effect of automatic reaming during drilling.

[0043] Before drilling and reaming, when the reaming size needs to be adjusted according to the reaming requirements, the operator uses an external hexagonal wrench or a rotary arm to rotate the hexagonal socket 404 clockwise. This drives the left screw 401 to rotate, which in turn drives the left gear 402 to rotate. The left gear 402 then drives the internal gear ring 403 to rotate, which in turn drives the other three gears 402 meshing with it to rotate. These three gears 402 then drive the other three screws 401 to rotate, causing all four screws 401 to rotate synchronously. The rotation of the four screws 401 drives the four L-shaped rods 405 to move downwards synchronously. The four L-shaped rods 405 drive the four connecting rods 305 to rotate downwards synchronously. As the four connecting rods 305 rotate downwards, they drive the four expansion seats 3 to slide outwards synchronously within the four rectangular receiving slots 202. The four expansion seats 3 slide laterally on their corresponding two horizontal guide rods 302, performing lateral guiding work and stretching and storing energy in the four springs 303. The expansion seats 3 are used to drive multiple second reaming drill teeth 301 to move outward to increase the reaming size. After the adjustment is appropriate, the rotation of the internal hexagonal sleeve 404 is stopped. The expansion seats 3 are fixed by the self-damping locking force of the threads of the four screws 401 and the four L-shaped rods 405. The expansion seats 3 can be adjusted by expanding the size, which can be easily adjusted according to the reaming requirements. This improves the flexibility and applicability of use and reduces the number of drill bits of different sizes. The new design of the threaded drive components, cross guides and springs 303 are all integrated and hidden, which effectively avoids the phenomenon that the exposed drive components such as threaded components are easily blocked by soil impurities or damaged by collisions. It is convenient for subsequent stable adjustment and application, improves long-term stability and lifespan. Moreover, this method only requires a simple rinse of the outer surface to maintain the cleanliness, which improves the convenience of subsequent cleaning.

[0044] When subsequent retraction and adjustment are required, the internal hexagonal swivel 404 is rotated in the opposite direction. Similarly, the movement direction of the internal hexagonal swivel 404 is completely opposite to that of the forward rotation mentioned above. At this time, the four L-shaped rods 405 change to move upward and drive the four connecting rods 305 to rotate upward. When the four connecting rods 305 rotate upward, they pull the four expansion seats 3 inward. At this time, the elastic force of the four springs 303, which are in a stretched state, assists in driving the four expansion seats 3 to retract and move inward, thus achieving the effect of retracting and retracting the four expansion seats 3.

[0045] Finally, it should be noted that the above description is merely a preferred embodiment of this utility model and is not intended to limit the utility model. Although the utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this utility model should be included within the protection scope of this utility model.

Claims

1. A borehole reamer for oil and gas drilling, comprising a connecting pipe (1), characterized in that: include: The connecting pipe (1) has a drill joint fixedly connected to its top and bottom ends; A circular sleeve (2) is fixedly sleeved on the outside of the connecting pipe (1). A rectangular receiving groove (202) is provided on all four sides of the sleeve. The bottom of the sleeve is set as a conical structure. Multiple first reaming drill teeth (201) are fixedly connected to the outside of the conical structure. The expansion seat (3) consists of four sets, which are slidably fitted into the corresponding rectangular receiving groove (202). The opposing sides of the two expansion seats (3) are both set as inclined surfaces, and the two opposing inclined surfaces are symmetrically arranged and fixedly connected with multiple second reaming drill teeth (301). The transverse missile linear pull-back assembly consists of four sets, which are respectively fixedly connected to the inner wall of the corresponding rectangular receiving groove (202) on the side away from its opening, and are respectively connected to the corresponding expansion seat (3); The four-point linkage vertical drive assembly is fixedly connected to the top of the circular sleeve (2). The bottom of its four sides is rotatably installed with inclined connecting rods (305). The two opposite connecting rods (305) are symmetrically arranged. The four expansion seats (3) are rotatably installed on the bottom of the corresponding connecting rods (305) on the same side. The transverse linear pull-back assembly includes two transverse guide rods (302) and a spring (303). The inner wall of the rectangular receiving groove (202) away from its opening is fixedly connected to the ends of the corresponding two transverse guide rods (302) and the spring (303). The expansion seat (3) is slidably sleeved on the corresponding two transverse guide rods (302). The expansion seat (3) has a groove on the side near the connecting pipe (1). The end of the spring (303) away from the connecting pipe (1) is fixedly connected to the inner wall of the corresponding groove away from its opening. The four-point linkage vertical drive assembly includes a circular cover (4), an internal gear ring (403), four gears (402), four screws (401), four L-shaped rods (405), and an internal hexagonal swivel sleeve (404). The bottom of the circular cover (4) is set as an opening and is fixedly connected to the top of the circular sleeve (2). The circular cover (4) is fixedly sleeved on the connecting pipe (1). The four screws (401) are rotatably installed in a ring between the top of the circular sleeve (2) and the inner wall of the top of the circular cover (4). The internal gear ring (403) is rotatably installed on the inner wall of the top of the circular cover (4). The four gears (402) are meshed in a ring with equal intervals inside the internal gear ring (403). Each is fixedly sleeved on the corresponding screw (401). The top of the screw (401) on the left extends to the top of the round cover (4) and is fixedly connected to the bottom of the inner hexagonal swivel sleeve (404). The outer side of the inner hexagonal swivel sleeve (404) is set as a hexagonal structure. The four L-shaped rods (405) are respectively threaded on the corresponding screw (401). The bottom ends of the four L-shaped rods (405) slide into the corresponding rectangular receiving grooves (202). The bottom of the four L-shaped rods (405) on the opposite side are respectively rotatably installed with the top of the corresponding connecting rod (305). The four horizontal guide rods (302) located above are respectively movably sleeved on the corresponding L-shaped rods (405).

2. The drilling reaming device for oil and gas wells according to claim 1, characterized in that: The expansion seat (3) has two horizontal guide grooves on the side near the connecting pipe (1), which are respectively slidably fitted to the outer side of the corresponding horizontal guide rod (302).

3. The drilling reaming device for oil and gas wells according to claim 1, characterized in that: The top of the L-shaped rod (405) is provided with a threaded hole that is threaded to the corresponding screw (401).

4. The drilling reaming device for oil and gas wells according to claim 1, characterized in that: The rectangular receiving groove (202) has a rectangular guide hole on its top inner wall that slides and fits with the outer side of the corresponding L-shaped rod (405).

5. The drilling reaming device for oil and gas wells according to claim 1, characterized in that: The top of the horizontal guide rod (302) located above has a rectangular through hole (304). The rectangular through hole (304) is set to open on the side near the connecting pipe (1). The L-shaped rod (405) is located in the corresponding rectangular through hole (304) and is in contact with its inner wall.

Images