A drill pipe centering device for oil production

Abstract

The invention relates to the technical field of drill pipe auxiliary accessories, and discloses a drill pipe centering device for oil drilling, comprising an outer wheel, two support rods respectively installed at both ends of the bottom of the outer wheel for supporting the device as a whole, and a mounting plate fixedly connected to the bottom of the support rods for fixing the whole device, the outer wheel also comprises: an inner wheel, which is arranged inside the outer wheel, the inner wheel is used to ensure that the drill pipe can rotate normally inside the outer wheel to drill oil wells, four straightening devices, which are respectively installed inside the inner wheel and the four straightening devices are arranged in a ring array on the inner wheel, the straightening device is used to straighten the drill pipe and adjust the clamping force of the drill pipe according to the size of the drill pipe, the device has the advantages that the device can spontaneously adjust its clamping force according to the size of the square drill pipe, the straightening effect of the lifting device, the use range of the lifting device, the device can perform secondary centering and straightening, etc.

Description

Technical Field

[0001] The invention relates to the technical field of drill rod auxiliary accessories, in particular to a drill rod centering device used in petroleum mining. Background Art

[0002] Drill pipe is a steel pipe with a threaded tail end, which is used to connect the surface equipment of the drilling rig and the drilling and grinding equipment or bottom hole device at the bottom of the well. The purpose of the drill pipe is to transport drilling mud to the drill bit and raise, lower or rotate the bottom hole device together with the drill bit. The drill pipe must be able to withstand huge internal and external pressure, twisting, bending and vibration. In oil extraction, the drill pipe can be used many times.

[0003] Publication No.: CN201738838U discloses a drill pipe centering and straightening device, comprising a supporting device, a driving device and a guiding device arranged on the supporting device, a first clamping device and a second clamping device that can slide along the guiding device, characterized in that: the driving device drives the first clamping device and the second clamping device through a connecting rod actuator, the connecting rod actuator comprises a first connecting rod and a second connecting rod, one end of the first connecting rod and the second connecting rod are respectively fixedly connected to the first clamping device and the second clamping device and can slide along the first guide groove and the second guide groove arranged on the supporting device, and the other end is connected to the first connecting rod and the second connecting rod through the corresponding connecting rod actuator. The slidable connecting rod connector of the supporting device is fixedly connected with the driving device. The device makes the force on both sides of the drill pipe uniform, saves time and effort, has low labor intensity, and is safe, fast and simple. However, in actual use, due to the different sizes of drill pipes used for drilling oil wells on the market, the device and existing equipment cannot spontaneously adjust the clamping force of the drill pipe according to the size of the drill pipe, resulting in the same clamping force being applied when the drill pipe is small in size and thin in thickness, thereby squeezing the drill pipe; and applying the same clamping force when the drill pipe is large in size and thick in thickness makes it impossible to clamp the drill pipe, thereby reducing the straightening effect. The technology for centering and straightening the drill pipe still has obvious room for improvement. Summary of the invention

[0004] In view of the deficiencies in the prior art, the present invention provides a drill pipe centering device for oil drilling, which has the advantages of being able to spontaneously adjust the clamping force according to the size of the square drill pipe, improving the straightening effect of the enhancement device, improving the use range of the device, and being able to perform secondary centering and straightening.

[0005] To achieve the above-mentioned purpose, the present invention provides the following technical solutions: A drill pipe centering device for oil drilling, comprising: an outer wheel, a support rod, a mounting plate, a slide groove, an inner wheel, a slip ring, a straightening device, a first liquid storage cylinder, a first stretching rod, a first piston plate, a first spring, a contact plate, a roller, a delivery pipe, a second liquid storage cylinder, a second spring, a second piston plate, a second stretching rod, a rotating part, a straightening plate, a rotating groove, an auxiliary device, a first connecting plate, a shaft rod, a gear, a second connecting plate, a third spring, and an auxiliary plate.

[0006] The positions and connection relationships of the above structures are as follows: A drill pipe centering device for oil mining, comprising an outer wheel, two support rods respectively mounted at both ends of the bottom of the outer wheel for supporting the entire device, and a mounting plate fixedly connected to the bottom of the support rods for fixing the entire device, the outer wheel also comprising:

[0007] The inner wheel is arranged inside the outer wheel, and the inner wheel is used to ensure that the drill pipe can rotate normally inside the outer wheel to drill the oil well;

[0008] Four straightening devices are respectively installed inside the inner wheel and the four straightening devices are arranged in a ring array on the inner wheel. The straightening devices are used to straighten the drill rod and adjust the clamping force of the drill rod according to the size of the drill rod. The straightening devices can straighten and adjust the clamping force for both square and round drill rods on the market, thereby improving the supporting effect and applicability of the device;

[0009] Four auxiliary devices are respectively installed at the bottom of the four straightening devices. The auxiliary devices are used to cooperate with the straightening devices to straighten the square drill rod and the round drill rod and enhance the straightening effect of the device.

[0010] Preferably, the outer wheel also includes two slide grooves, which are respectively opened on the inner top and bottom sides of the outer wheel, and the top of the inner wheel is fixedly connected with a slip ring adapted to the slide groove. The inner wheel is provided with a through hole and the through hole extends to the outer side of the top and bottom of the inner wheel, which is used to cooperate with the inner wheel to assist the drill rod to rotate when placed in the through hole, thereby assisting the drill rod to drill the oil well.

[0011] Preferably, the straightening device includes a first fluid storage cylinder, which is fixedly connected to the inside of the straightening device, a part of the first fluid storage cylinder extends to the outside of the through hole, the inside of the first fluid storage cylinder is movably connected to a first stretching rod, and the end of the first stretching rod away from the through hole is fixedly connected to a first piston plate, and the inside of the first fluid storage cylinder is filled with hydraulic oil to provide power for the device to clamp and straighten the drill rod.

[0012] Preferably, the straightening device also includes four first springs, which are respectively installed at both ends of the partial surface of the first fluid storage cylinder extending to the outside of the through hole, and the first stretching rod is arranged at the center of the two first springs. The first spring and the first stretching rod are fixedly connected to a contact plate at one end away from the first fluid storage cylinder, which is used to provide power for resetting the device and readjusting the hydraulic pressure.

[0013] Preferably, the contact plate is internally rotatably connected with a roller, the outer surface of the upper half of the contact plate is set to be an arc shape, and the roller is set at the connection between the upper semi-arc part and the lower semi-rectangular part of the contact plate, which is used to assist the downward movement of the drill rod when the drill rod drills the oil well, and reduce the wear of the drill rod when it rotates and moves downward while being clamped and straightened.

[0014] Preferably, the straightening device also includes two second liquid storage cylinders, which are installed inside the straightening device and the two second liquid storage cylinders are respectively arranged on the left and right sides of the first liquid storage cylinder, one end of the second liquid storage cylinder away from the through hole is fixedly connected with a delivery pipe and the end of the delivery pipe away from the second liquid storage cylinder is fixedly connected to the end of the first liquid storage cylinder away from the through hole, the second liquid storage cylinder is not filled with hydraulic oil and the sum of the capacities of the two second liquid storage cylinders is the same as the capacity of the first liquid storage cylinder, which is used to clamp and straighten the drill rod.

[0015] Preferably, the second liquid storage cylinder is movably connected to a second stretching rod inside and the second stretching rod extends to the outside of an end of the second liquid storage cylinder close to the through hole, and the second stretching rod is fixedly connected to a second piston plate at an end away from the through hole, and the second piston plate is fixedly connected to an end away from the second stretching rod with two second springs and the other ends of the two second springs are fixedly connected to the inner wall of the second liquid storage cylinder, so as to provide power for resetting the device and readjusting the hydraulic pressure.

[0016] Preferably, the portion of the second stretching rod extending to the through hole is fixedly connected to a rotating part, a straightening plate is provided at the end of the rotating part away from the second stretching rod, a rotating groove is provided at the end of the straightening plate close to the rotating part, the rotating part is rotatably connected to the straightening plate through the rotating groove portion of the straightening plate, and the straightening plate is arranged in a rectangular shape to ensure the normal operation of the device.

[0017] Preferably, the auxiliary device includes a first connecting plate, which is slidably connected to the internal top side of the auxiliary device and one end of the first connecting plate close to the contact plate is fixedly connected to the bottom side of an end of the contact plate away from the through hole, an axle is provided at the bottom of the first connecting plate and the axle is rotatably connected to the inside of the auxiliary device, a plurality of teeth are fixedly connected on both sides of the bottom of the first connecting plate, one end of the axle close to the teeth is fixedly connected to a gear, a second connecting plate is slidably connected to the inside of the auxiliary device and one end of the second connecting plate close to the gear is also fixedly connected to the teeth, the gear is meshed with the first connecting plate and the second connecting plate respectively through the teeth, and through grooves matching the first connecting plate and the second connecting plate are respectively provided on the top and bottom sides of one end of the auxiliary device close to the through hole, so as to provide power for secondary straightening and clamping of the device.

[0018] Preferably, the end of the second connecting plate close to the through hole is fixedly connected to a third spring, and the end of the third spring away from the second connecting plate is fixedly connected to an auxiliary plate. The auxiliary plate is arranged in an arc shape and the auxiliary plate and the third spring are both arranged on the outside of the auxiliary device to ensure the normal operation of the device.

[0019] Beneficial effects:

[0020] 1. The oil mining adopts a drill pipe centering device. Through the contact plate in the centering device and the moving device of the centering plate, the clamping force can be appropriately adjusted according to the size of the square drill pipe to improve the centering effect of the device.

[0021] 2. The drill pipe centering device used in oil mining can adapt to the current round drill pipes and square drill pipes on the market for clamping and straightening by moving the contact plate and the straightening plate and contacting different drill pipes on the market, thereby increasing the use range of the device and improving the clamping and straightening effect of the device, making it easier for users to use.

[0022] 3. The oil mining uses a drill pipe centering device, which drives the first connecting plate to move by moving the contact plate so that the drill pipe can be centered and straightened for the second time in the device, thereby improving the straightening effect of the device. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 This is a schematic diagram of the appearance and structure of a drill pipe centering device for oil mining according to the present invention;

[0024] Figure 2 This is a schematic diagram of the inner wheel structure of a drill pipe centering device for oil mining according to the present invention;

[0025] Figure 3 This is a structural schematic diagram of a drill pipe centering device and a straightening device for oil drilling according to the present invention;

[0026] Figure 4 This is a schematic diagram of the internal structure of a drill pipe centering device and a straightening device for oil drilling according to the present invention;

[0027] Figure 5 This is a schematic diagram of the structure of a centralizing plate of a drill pipe centering device for oil mining according to the present invention;

[0028] Figure 6 This is a schematic diagram of the internal structure of an auxiliary device for a drill pipe centering device for oil mining according to the present invention;

[0029] Figure 7 It is a rear view structural schematic diagram of an auxiliary device for a drill pipe centering device for oil mining according to the present invention;

[0030] Figure 8 The present invention is a kind of oil mining drilling rod centering device working Figure 1 Structural diagram;

[0031] Fig. 9 The present invention is a kind of oil mining drilling rod centering device working Figure 2 Structural diagram.

[0032] In the figure: 1, outer wheel; 10, support rod; 11, mounting plate; 12, slide groove; 2, inner wheel; 20, slip ring; 3, straightening device; 30, first liquid storage cylinder; 31, first stretching rod; 310, first piston plate; 32, first spring; 33, contact plate; 34, roller; 35, conveying pipe; 36, second liquid storage cylinder; 37, second spring; 38, second piston plate; 380, second stretching rod; 381, rotating part; 39, straightening plate; 390, rotating groove; 4, auxiliary device; 40, first connecting plate; 41, shaft; 42, gear; 43, second connecting plate; 44, third spring; 45, auxiliary plate. DETAILED DESCRIPTION

[0033] 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 of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0034] Embodiment 1

[0035] See also Figure 1-Figure 9 A drill pipe centering device for oil drilling comprises an outer wheel 1, two support rods 10 respectively mounted at both ends of the bottom of the outer wheel 1 for supporting the whole device, and a mounting plate 11 fixedly connected to the bottom of the support rods 10 for fixing the whole device, and the outer wheel 1 also comprises:

[0036] The inner wheel 2 is arranged inside the outer wheel 1, and the inner wheel 2 is used to ensure that the drill pipe can rotate normally inside the outer wheel 1 to drill the oil well;

[0037] Four straightening devices 3 are respectively installed inside the inner wheel 2 and the four straightening devices 3 are arranged in a ring array on the inner wheel 2. The straightening devices 3 are used to straighten the drill rod and adjust the clamping force of the drill rod according to the size of the drill rod. The straightening devices 3 can straighten and adjust the clamping force for both square drill rods and round drill rods on the market, thereby improving the supporting effect and applicability of the device;

[0038] Four auxiliary devices 4 are respectively installed at the bottom of the four straightening devices 3. The auxiliary devices 4 are used to cooperate with the straightening devices 3 to straighten the square drill rod and the round drill rod and enhance the straightening effect of the device.

[0039] Embodiment 2

[0040] See also Figure 1-Figure 9 On the basis of the first embodiment, the outer wheel 1 further includes two slide grooves 12, which are respectively opened on the inner top and bottom sides of the outer wheel 1, and the top of the inner wheel 2 is fixedly connected with a slip ring 20 adapted to the slide groove 12. A through hole is opened inside the inner wheel 2 and the through hole extends to the outer side of the top and bottom of the inner wheel 2, which is used to cooperate with the inner wheel 2 to assist the rotation of the drill rod placed in the through hole, so as to assist the drill rod in drilling oil wells.

[0041] The straightening device 3 includes a first liquid reservoir 30, which is fixedly connected to the inside of the straightening device 3. A part of the first liquid reservoir 30 extends to the outside of the through hole. The inside of the first liquid reservoir 30 is movably connected to a first stretching rod 31. The end of the first stretching rod 31 away from the through hole is fixedly connected to a first piston plate 310. The inside of the first liquid reservoir 30 is filled with hydraulic oil, which is used to provide power for the device to clamp and straighten the drill pipe.

[0042] The straightening device 3 also includes four first springs 32, which are respectively installed at both ends of the partial surface of the first liquid storage cylinder 30 extending to the outside of the through hole, and the first stretching rod 31 is arranged at the center of the two first springs 32. The first spring 32 and the first stretching rod 31 are fixedly connected to the contact plate 33 at one end away from the first liquid storage cylinder 30, which is used to provide power for resetting the device and readjusting the hydraulic pressure.

[0043] The contact plate 33 is internally rotatably connected with a roller 34. The outer surface of the upper half of the contact plate 33 is set to be an arc shape. The roller 34 is set at the connection between the upper arc part and the lower rectangular part of the contact plate 33, and is used to assist the drill pipe to move downward when drilling an oil well, thereby reducing the wear of the drill pipe when it rotates and moves downward while being clamped and straightened.

[0044] The straightening device 3 also includes two second liquid storage cylinders 36, which are installed inside the straightening device 3 and the two second liquid storage cylinders 36 are respectively arranged on the left and right sides of the first liquid storage cylinder 30, and the end of the second liquid storage cylinder 36 away from the through hole is fixedly connected to the delivery pipe 35 and the end of the delivery pipe 35 away from the second liquid storage cylinder 36 is fixedly connected to the end of the first liquid storage cylinder 30 away from the through hole. The second liquid storage cylinder 36 is not filled with hydraulic oil and the sum of the capacities of the two second liquid storage cylinders 36 is the same as the capacity of the first liquid storage cylinder 30, which is used to clamp and straighten the drill rod.

[0045] The second liquid storage cylinder 36 is internally movably connected with a second stretching rod 380, and the second stretching rod 380 extends to the outside of one end of the second liquid storage cylinder 36 close to the through hole, and the second stretching rod 380 is fixedly connected to a second piston plate 38 at one end away from the through hole, and the second piston plate 38 is fixedly connected to one end away from the second stretching rod 380 with two second springs 37, and the other ends of the two second springs 37 are fixedly connected to the inner wall of the second liquid storage cylinder 36, so as to provide power for resetting the device and readjusting the hydraulic pressure.

[0046] The part of the second stretching rod 380 extending to the through hole is fixedly connected with a rotating member 381, and a straightening plate 39 is provided at the end of the rotating member 381 away from the second stretching rod 380. A rotating groove 390 is provided at the end of the straightening plate 39 close to the rotating member 381. The rotating member 381 is rotatably connected to the straightening plate 39 through the rotating groove 390 of the straightening plate 39. The straightening plate 39 is set to a rectangle to ensure the normal operation of the device.

[0047] Embodiment 3

[0048] See also Figure 1-Figure 9 On the basis of the second embodiment, the auxiliary device 4 includes a first connecting plate 40, which is slidably connected to the internal top side of the auxiliary device 4 and one end of the first connecting plate 40 close to the contact plate 33 is fixedly connected to the bottom side of the end of the contact plate 33 away from the through hole. A shaft rod 41 is provided at the bottom of the first connecting plate 40 and the shaft rod 41 is rotatably connected to the inside of the auxiliary device 4. A plurality of latch teeth are fixedly connected to both sides of the bottom of the first connecting plate 40, and one end of the shaft rod 41 close to the latch teeth is fixedly connected to a gear 42. A second connecting plate 43 is slidably connected to the inside of the auxiliary device 4 and one end of the second connecting plate 43 close to the gear 42 is also fixedly connected to the latch teeth. The gear 42 is meshed and connected with the first connecting plate 40 and the second connecting plate 43 through the latch teeth. The top and bottom sides of the end of the auxiliary device 4 close to the through hole are respectively provided with through grooves adapted to the first connecting plate 40 and the second connecting plate 43, which are used to provide power for the secondary straightening and clamping of the device.

[0049] The end of the second connecting plate 43 close to the through hole is fixedly connected to the third spring 44, and the end of the third spring 44 away from the second connecting plate 43 is fixedly connected to the auxiliary plate 45. The auxiliary plate 45 is arranged in an arc shape and the auxiliary plate 45 and the third spring 44 are both arranged on the outside of the auxiliary device 4 to ensure the normal operation of the device.

[0050] Working principle: The square drill rod can be divided into four planes and four corners according to the contact surface. When the square drill rod is of appropriate size, the square drill rod is hung positively on the top of the outer wheel 1. At this time, the roller 34 and the straightening plate 39 are linearly parallel to the plane of the square drill rod. The top of the square drill rod is clamped with a motion device composed of a rotary drive component and a linear drive component. When drilling an oil well normally, the motion device is used to drive the square drill rod to move to the through hole of the inner wheel 2. In the initial state, there are four contact plates 33 and rollers 34 at the through hole as blocks. The roller 34 is used to assist the downward movement of the drill rod. The inner wheel 2 and the outer wheel 1 are used to assist the rotation of the drill rod in the through hole. The outer wheel 1 is fixed to the ground through the mounting plate 11. The square drill rod is When entering the through hole, the arc-shaped portion of the upper part of the contact plate 33 preferentially contacts the roller 34 and applies a force to rotate the roller 34 downward. Then, the square drill rod applies pressure to the contact plate 33 when it moves downward under the rotation of the roller 34. The contact plate 33 is affected by the pressure and drives the first stretching rod 31 and the first piston plate 310 to move in the first liquid storage cylinder 30 toward the direction of the delivery pipe 35. In this process, the first spring 32 undergoes a compressed elastic deformation, thereby squeezing the hydraulic oil inside the first liquid storage cylinder 30 into the two second liquid storage cylinders 36 through the delivery pipe 35. Since the pressure applied by the first piston plate 310 is the same, the amount of hydraulic oil transmitted by the delivery pipes 35 on both sides is the same, and the two second liquid storage cylinders 36 are The oil inflow amount inside the liquid storage cylinder 36 is the same, and then the hydraulic oil at the bottom of the second piston plate 38 is continuously increased to apply thrust to the second piston plate 38 and the second stretching rod 380, so that the second stretching rod 380 and the straightening plate 39 move toward the direction of the square drill rod, until the second stretching rod 380 drives the straightening plate 39 to fit the plane of the square drill rod. At this time, the contact surfaces of the straightening plate 39, the roller 34 and the square drill rod are in the same plane. When the size of the square drill rod is appropriate, the device not only straightens the square drill rod but also clamps it to improve the stability of the square drill rod when it rotates downward to drill the oil well. The movement of the contact plate 33 drives the first connecting plate 40 to move in the direction away from the through hole, and the first connecting plate The movement of the gear 42 drives the second connecting plate 43 to move toward the direction close to the square drill rod. The movement of the second connecting plate 43 drives the third spring 44 and the auxiliary plate 45 to move toward the plane of the square drill rod until the two contact surfaces of the arc-shaped structure of the auxiliary plate 45 are against the plane of the square drill rod. The auxiliary plate 45 is set to be inclined from top to bottom, and the third spring 44 is elastically deformed. After the drill rod is used, the first spring 32 and the second spring 37 are used for resetting and adjusting the hydraulic pressure inside the first liquid storage cylinder 30 and the second liquid storage cylinder 36, thereby performing secondary straightening on the square drill rod, so that the square drill rod can be centered and straightened in the device, thereby improving the straightening effect of the device;

[0051] When the square drill rod is smaller than the appropriate size, it is placed according to the above steps. At this time, the moving distance of the straightening plate 39 is not enough to be close to the plane of the square drill rod. The clamping force of the corresponding roller 34 on the small-sized square drill rod is relatively small compared to the square drill rod of appropriate size. At this time, the roller 34 and the auxiliary plate 45 clamp and straighten it, so as to avoid the device giving the same clamping force when the square drill rod is smaller in size and thinner in thickness, thereby squeezing and damaging the square drill rod, so that the device can appropriately adjust its clamping force according to the size of the square drill rod, thereby improving the straightening effect of the device;

[0052] When the size of the square drill rod is larger than the appropriate size, the placement direction of the square drill rod is rotated so that the contact plane of the roller 34 is parallel to the corners of the square drill rod, and the two straightening plates 39 are respectively crossed on the two planes at the corners of the square drill rod, and then placed according to the above steps. At this time, the straightening plate 39 is driven by the inclined plane of the square drill rod to tilt through the rotating member 381 and the rotating groove 390 until the straightening plate 39 is in close contact with the plane of the square drill rod. At this time, the contact between the roller 34 and the square drill rod is point contact, and the contact between the two straightening plates 39 and the square drill rod is surface contact, so that the contact surface of the roller 34 and the two straightening plates 39 is The area can form a triangle shape to clamp one corner of the square drill rod and the plane near the corner, and the four straightening devices 3 clamp and fix the four corners of the square drill rod. The larger the size of the square drill rod, the greater the moving distance of the roller 34, and the greater the thrust that can be applied by the two straightening plates 39, thereby increasing the clamping force of the four straightening devices 3 in the inner wheel 2, avoiding the phenomenon that the device gives the same clamping force as the drill rod with the same size when the square drill rod is larger and thicker, resulting in the inability to clamp the drill rod and reducing the straightening effect, so that the device can appropriately adjust its clamping force according to the size of the square drill rod, thereby improving the straightening effect of the device;

[0053] When the device uses round drill rods instead of square drill rods to drill oil wells, since the cross-section of the round drill rod is round, the four rollers 34 are used to clamp and straighten the round drill rods respectively. In this case, the clamping properties of the device are similar to the case where the size of the square drill rod is larger than the adaptable size, that is, the device can be placed in the same manner as the square drill rod and the clamping force can be adjusted spontaneously. In this process, there is no need to adjust the placement direction of the round drill rod. Therefore, the device can adapt to the clamping and straightening of the round drill rods and square drill rods currently on the market, thereby increasing the scope of use of the device and improving the clamping and straightening effect of the device, making it easier for users to use.

[0054] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A drill pipe centering device for oil drilling, comprising an outer wheel (1), two support rods (10) respectively mounted at both ends of the bottom of the outer wheel (1) for supporting the entire device, and a mounting plate (11) fixedly connected to the bottom of the support rods (10) for fixing the entire device, characterized in that: The outer wheel (1) further comprises: An inner wheel (2) is arranged inside the outer wheel (1), and the inner wheel (2) is used to ensure that the drill pipe can rotate normally inside the outer wheel (1) to drill the oil well; Four straightening devices (3) are respectively installed inside the inner wheel (2) and the four straightening devices (3) are arranged in a ring array on the inner wheel (2). The straightening devices (3) are used to straighten the drill rod and adjust the clamping force of the drill rod according to the size of the drill rod. The straightening devices (3) can straighten and adjust the clamping force of both square drill rods and round drill rods on the market, thereby improving the supporting effect and applicability of the device. The straightening device (3) comprises a first liquid storage cylinder (30) which is fixedly connected inside the straightening device (3), a portion of the first liquid storage cylinder (30) extends outside the through hole, a first stretching rod (31) is movably connected inside the first liquid storage cylinder (30), an end of the first stretching rod (31) away from the through hole is fixedly connected to a first piston plate (310), and the first liquid storage cylinder (30) is filled with hydraulic oil; The straightening device (3) further comprises four first springs (32), which are respectively mounted on both ends of a portion of the surface of the first liquid storage cylinder (30) extending to the outside of the through hole, and a first stretching rod (31) is arranged at the center of the two first springs (32), and the ends of the first springs (32) and the first stretching rod (31) away from the first liquid storage cylinder (30) are fixedly connected to a contact plate (33); The righting device (3) further comprises two second liquid storage cylinders (36), which are installed inside the righting device (3) and are respectively arranged on the left and right sides of the first liquid storage cylinder (30), one end of the second liquid storage cylinder (36) away from the through hole is fixedly connected to a delivery pipe (35), and one end of the delivery pipe (35) away from the second liquid storage cylinder (36) is fixedly connected to one end of the first liquid storage cylinder (30) away from the through hole, the second liquid storage cylinder (36) is not filled with hydraulic oil, and the sum of the capacities of the two second liquid storage cylinders (36) is the same as the capacity of the first liquid storage cylinder (30); Four auxiliary devices (4) are respectively installed at the bottom of the four straightening devices (3), and the auxiliary devices (4) are used to cooperate with the straightening devices (3) to straighten the square drill rod and the round drill rod and improve the straightening effect of the device.

2. A drill pipe centering device for oil production according to claim 1, characterized in that: The outer wheel (1) further comprises two slide grooves (12), which are respectively provided on the top and bottom sides of the inner part of the outer wheel (1); a slip ring (20) adapted to the slide groove (12) is fixedly connected to the top of the inner wheel (2); a through hole is provided inside the inner wheel (2) and extends to the outer sides of the top and bottom of the inner wheel (2).

3. The drill pipe centering device for oil drilling according to claim 1, characterized in that: The contact plate (33) is rotatably connected to a roller (34) inside, the outer surface of the upper half of the contact plate (33) is arranged in an arc shape, and the roller (34) is arranged at the connection between the upper arc-shaped part and the lower rectangular part of the contact plate (33).

4. The drill pipe centering device for oil drilling according to claim 1, characterized in that: A second stretching rod (380) is movably connected inside the second liquid storage cylinder (36), and the second stretching rod (380) extends to the outside of one end of the second liquid storage cylinder (36) close to the through hole, and one end of the second stretching rod (380) away from the through hole is fixedly connected to a second piston plate (38), and one end of the second piston plate (38) away from the second stretching rod (380) is fixedly connected to two second springs (37), and the other ends of the two second springs (37) are fixedly connected to the inner wall of the second liquid storage cylinder (36).

5. The drill pipe centering device for oil drilling according to claim 4, characterized in that: The portion of the second stretching rod (380) extending to the through hole is fixedly connected to a rotating member (381); an end of the rotating member (381) away from the second stretching rod (380) is provided with a straightening plate (39); an end of the straightening plate (39) close to the rotating member (381) is provided with a rotating groove (390); the rotating member (381) is rotatably connected to the straightening plate (39) through the rotating groove (390) of the straightening plate (39); and the straightening plate (39) is arranged in a rectangular shape.

6. The drill pipe centering device for oil drilling according to claim 1, characterized in that: The auxiliary device (4) comprises a first connecting plate (40) which is slidably connected to the top side of the interior of the auxiliary device (4) and one end of the first connecting plate (40) close to the contact plate (33) is fixedly connected to the bottom side of one end of the contact plate (33) away from the through hole; a shaft (41) is provided at the bottom of the first connecting plate (40) and the shaft (41) is rotatably connected to the interior of the auxiliary device (4); a plurality of latching teeth are fixedly connected to both sides of the bottom of the first connecting plate (40); one end of the shaft (41) close to the latching teeth is fixedly connected to a gear (42); a second connecting plate (43) is slidably connected to the interior of the auxiliary device (4) and one end of the second connecting plate (43) close to the gear (42) is also fixedly connected to the latching teeth; the gear (42) is meshedly connected to the first connecting plate (40) and the second connecting plate (43) via the latching teeth; and through grooves matching the first connecting plate (40) and the second connecting plate (43) are respectively provided at the top side and the bottom side of one end of the auxiliary device (4) close to the through hole.

7. A drill pipe centering device for oil production according to claim 6, characterized in that: One end of the second connecting plate (43) close to the through hole is fixedly connected to a third spring (44), and one end of the third spring (44) away from the second connecting plate (43) is fixedly connected to an auxiliary plate (45); the auxiliary plate (45) is arranged in an arc shape, and the auxiliary plate (45) and the third spring (44) are both arranged outside the auxiliary device (4).

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