Friction belt type tooth mark-free hydraulic power tongs

Abstract

The invention relates to the technical field of well drilling, in particular to friction belt type tooth mark-free hydraulic power tongs. The sleeve wrench mainly solves the problem that the surface of a sleeve is damaged when the sleeve is tightened by an existing sleeve wrench. The pair of friction belt type tooth mark-free hydraulic power tongs comprises a supporting seat (5) and a motor (1), the motor (1) is fixed above the supporting seat (5), an output shaft of the motor (1) is connected with a driving shaft (4), the driving shaft (4) is connected with a chain wheel, and the chain wheel is connected with a transmission chain (16); the supporting seat (5) is connected with two clamping arms (12), the clamping arms (12) are driven by a hydraulic cylinder, and the transmission chain (16) bypasses the two clamping arms (12) and then is in contact with a sleeve; a hydraulic arm (15) is connected to the supporting seat (5), and the end of the hydraulic arm (15) is supported on the transmission chain (16). The friction belt type tooth-mark-free hydraulic power tongs cannot damage a casing pipe, labor is saved in operation, and the operation efficiency of the casing pipe tongs is improved.

Description

Technical Field

[0001] This invention relates to the field of drilling technology, specifically a friction band type toothless hydraulic power tong. Background Technology

[0002] In oil and gas field drilling, casing installation is a crucial drilling operation. Casing plays a vital role in protecting and supporting the wellbore in the open hole, and isolating it from oil, gas, and water formations. Typically, a single casing pipe is about ten meters long. Before being run into the wellbore, the casing pipes need to be connected to form a casing string to support the well arm. Currently, conventional hydraulic power tongs use metal jaws and employ an involute climbing principle to drive the jaws to grip the casing and complete the coupling / uncoupling process. This method, after completing the coupling / uncoupling operation, will cause a certain degree of damage to the casing surface. This damage will gradually expand under the corrosive effects of chemicals after the casing is run into the well, creating potential quality issues with the completion string. Summary of the Invention

[0003] To overcome the shortcomings of existing casing wrenches that damage the casing surface when tightening casings, this invention provides a friction belt type toothless hydraulic power wrench. This friction belt type toothless hydraulic power wrench will not damage the casing, is easier to operate, and improves the efficiency of casing wrench operation.

[0004] The technical solution of the present invention is: a friction belt type toothless hydraulic power clamp, including a support base and a motor. The motor is fixed above the support base. The output shaft of the motor is connected to a drive shaft. A sprocket is connected to the drive shaft. A transmission chain is connected to the sprocket. Two clamping arms are connected to the support base. The clamping arms are driven by a hydraulic cylinder. The transmission chain passes around the two clamping arms and then contacts the sleeve. A hydraulic arm is connected to the support base. The end of the hydraulic arm is supported on the transmission chain.

[0005] Furthermore, the transmission chain includes a chain with a belt on its outer side.

[0006] Furthermore, a circular clamping plate is connected to the end of the clamping arm corresponding to the transmission chain. When the clamping arm clamps the sleeve, the outer belt of the transmission chain contacts the sleeve after passing around the clamping plates on both sides.

[0007] Furthermore, a torque monitor is fixed on the outside of the support base.

[0008] Furthermore, one end of the drive shaft is connected to the motor output shaft, and the other end is connected to the bearing housing via a bearing, which is fixed to the support base.

[0009] Furthermore, there are two transmission chains arranged vertically along the drive shaft, and two hydraulic arms, with each transmission chain corresponding to one hydraulic arm.

[0010] Furthermore, the drive shaft is equipped with two sprockets, each of which is connected to a transmission chain.

[0011] Furthermore, the bottom of the support base is connected to the back clamp via a fixed pin, the bottom of the back clamp is fixed on the back clamp support base, and the back clamp is provided with two back clamp clamping arms, with a back clamp hydraulic cylinder connected between the two back clamp clamping arms.

[0012] Furthermore, during use, place the back clamp support on the wellhead so that the back clamp clamping arm clamps the casing coupling.

[0013] Connect the casing to the casing coupling, start the hydraulic cylinder of the clamping arm, so that the clamping arm drives the transmission chain to clamp the casing;

[0014] The hydraulic cylinder of the hydraulic arm is activated, and the hydraulic arm extends outward to tighten the transmission chain;

[0015] Start the motor, which drives the drive shaft to rotate. The drive shaft, through a sprocket, drives the transmission chain to rotate, thereby causing the bushing to rotate.

[0016] The present invention has the following beneficial effects: Due to the above-mentioned solution, the hydraulic power tongs, by using a transmission chain with a belt, can achieve casing uncoupling without damage, effectively protecting the casing body and coupling surface from damage; the transmission chain is clamped by the clamping arm, and the motor drives the uncoupling, which has stable performance, high reliability, saves manpower, improves the operating efficiency of the casing tongs, and reduces well completion costs. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the structure of the present invention;

[0018] Figure 2 This is a schematic diagram of the drive shaft;

[0019] Figure 3 This is a schematic diagram of a drive chain;

[0020] Figure 4 This is a schematic diagram of the flexible clamp head in its non-working state;

[0021] Figure 5 This is a schematic diagram of the flexible clamp head in its working state.

[0022] In the diagram, 1-motor, 2-straightening nut, 3-set bolt, 4-drive shaft, 5-support base, 6-fixing pin, 7-back clamp, 8-back clamp support base, 9-back clamp hydraulic cylinder, 10-back clamp clamping arm, 11-clamping plate, 12-clamping arm, 13-set screw, 14-straightening plate, 15-hydraulic arm, 16-drive chain, 17-torque monitor, 161-chain, 162-belt. Detailed Implementation

[0023] The present invention will now be described in detail with reference to the accompanying drawings and embodiments. The technical solutions in the embodiments of the present invention will be clearly and completely described. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0024] In the description of this invention, it is necessary to understand that the orientations or positional relationships indicated by terms such as "upper," "lower," "left," "right," "inner," "outer," "top," and "bottom" are based on the orientations or positional relationships shown in the accompanying drawings. They are intended only to facilitate the description of this invention and to simplify the description, and are not intended to indicate or imply that the components referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention.

[0025] Depend on Figures 1 to 3 As shown, a friction belt type toothless hydraulic power pliers includes a support base 5 and a motor 1. The motor 1 is fixed above the support base 5. The output shaft of the motor 1 is connected to a drive shaft 4 via a coupling. One end of the drive shaft 4 is connected to the output shaft of the motor 1, and the other end is connected to a bearing housing via a bearing. The bearing housing is fixed to the support base 5 and provides support for the drive shaft 4, ensuring its smooth operation. A sprocket is connected to the drive shaft 4. The sprocket is fixed to the drive shaft 4 via a flat key, and the sprocket is axially positioned to prevent it from moving up and down along the drive shaft 4.

[0026] A drive chain 16 is connected to the sprocket. The drive chain 16 includes a chain 161 and a belt 162 on the outer side of the chain 161. The belt 162 is made of rubber and is fixed to the chain 161, but the belt 162 should not affect the meshing between the chain 161 and the sprocket. With the belt 162 on the outer side of the drive chain 16, when the power pliers are in use, the belt 162 contacts the sleeve. Compared with chains and pliers teeth, the belt greatly reduces damage to the sleeve, avoiding the problem of easy damage to the sleeve caused by metal pliers teeth and chain wrenches in the past.

[0027] Two clamping arms 12 are connected to the support base 5. The clamping arms 12 are driven by hydraulic cylinders, which clamp or release them. The transmission chain 16 passes around the two clamping arms 12 and then contacts the sleeve. When the power clamp is in use, the ends of the two clamping arms 12 are located on both sides of the sleeve, allowing the transmission chain 16 to wrap around the outside of the sleeve. Combined with the clamping of the clamping arms 12, the transmission chain 16 tightly grips the sleeve. To reduce the possibility of slippage between the transmission chain 16 and the sleeve, the contact arc length between the transmission chain 16 and the sleeve should be greater than 180 degrees, that is, the clamping point of the clamping arm 12 should be located outside the center point of the sleeve.

[0028] Preferably, each clamping arm 12 is connected to a circular clamping plate 11 at its end by a set screw 13. The clamping plate 11 has baffles on its upper and lower outer edges, and the drive chain 16 is positioned between the two baffles to prevent it from slipping off. When clamping the sleeve, the drive chain 16 passes over the clamping plates 11 on both sides, and its outer belt 162 contacts the sleeve.

[0029] A hydraulic arm 15 is connected to the support base 5. The hydraulic arm 15 can be a two-way hydraulic cylinder. The hydraulic arm 15 is located at the center of the support base 5. When started, the two ends of the hydraulic arm 15 are respectively supported on the transmission chain 16, tightening the transmission chain 16. At the same time, the hydraulic arm 15 can also make the power clamp adapt to sleeves with different outer diameters, so that even if the outer diameter of the sleeve changes, the transmission chain 16 can still hold the sleeve tightly.

[0030] Preferably, there are two drive chains 16 arranged vertically along the drive shaft 4, with two corresponding sprockets on the drive shaft 4, each connected to one drive chain 16. Both drive chains pass over the clamping arm 12. Simultaneously, the width between the two baffles on the clamping plate 11 is widened to accommodate the two chains. There are also two corresponding hydraulic arms 15, one for each drive chain 16. The two drive chains 16 increase the friction between the chain and the sleeve, making the clamping more reliable.

[0031] The torque monitor 17 is fixed on the outside of the support base 5, which can monitor the torque output by the motor 1 in real time.

[0032] The bottom of the support base 5 is connected to the back clamp 7 via a fixing pin 6. The bottom of the back clamp 7 is fixed on the back clamp support base 8. The back clamp 7 is provided with two back clamp clamping arms 10, and a back clamp hydraulic cylinder 11 is connected between the two back clamp clamping arms 10. After the back clamp hydraulic cylinder 11 is activated, it can cause the back clamp clamping arms 10 to clamp the sleeve coupling, which can fix the power clamp and prevent the sleeve coupling from rotating when tightening the sleeve.

[0033] This friction belt type toothless hydraulic power pliers uses a drive chain to drive the original jaws. The drive chain is equivalent to a flexible pliers head, which can greatly increase the contact area with the sleeve. Its schematic diagram in the non-working state is shown below. Figure 4 The schematic diagram in working condition is shown below. Figure 5 This flexible clamping head ensures smooth engagement with the chain at any angle while bent, guaranteeing the stable transmission of torque from the chain to the flexible clamping head and its application to the sleeve surface. The flexible clamping head is connected to the clamping arm, controlling its bending angle during the buckling and unbuckling process. Based on the defined geometric parameters, the geometric relationship between the flexible clamping heads is as follows:

[0034]

[0035] In the formula, L s0 L is the outer edge length of the flexible clamp head when it is not in operation. s1 L is the outer arc length of the flexible clamp head when it is in working condition. x0 L is the inner edge length of the flexible clamp teeth in the non-working state. x1 θ is the inner arc length of the flexible pliers head when it is in working condition; θ is the bending angle of the flexible pliers head; ΔL s L represents the change in outer edge length between the non-working and working states. x0 This represents the change in inner edge length between the non-working and working states.

[0036] As can be seen from the simplified flexible model, the outer and inner arcs after bending are concentric arcs with radii of curvature R and R+H1 respectively. The geometric relationship is as follows:

[0037]

[0038] In the formula, R is the inner radius when in the working state; R+H1 is the outer radius when the inner radius is in the working state; H is the width of the flexible jaw head; ΔH is the change in the width of the flexible jaw head between the non-working state and the working state.

[0039] By combining the two systems, we can deduce that:

[0040]

[0041] The principle of this invention is to increase the contact area between the flexible pliers head and the sleeve surface by increasing the bending angle θ, thereby increasing the clamping force between the flexible pliers head and the sleeve. The clamping angle θ of the sleeve pliers in this invention is designed to be in the range of 150° to 270°, and the height H1 between the upper and lower edges after bending is in the range of 7-10mm, which can be used for the largest specification sleeve diameter.

[0042] When using this friction belt type toothless hydraulic power tong, place the back tong support base 8 on the wellhead, start the back tong hydraulic cylinder 9, and make the back tong clamping arm 10 clamp the casing coupling. This can fix the power tong and prevent the casing coupling from rotating with it when the casing is rotated.

[0043] When installing the casing, the casing can be hoisted and initially connected to the casing coupling. Then, the hydraulic cylinder of the clamping arm 12 is activated, causing the clamping arm 16 to retract inward, driving the transmission chain 16 to clamp the casing. The hydraulic cylinder of the hydraulic arm 15 is activated, causing the hydraulic arm 15 to extend outward, tightening the transmission chain 16, so that the transmission chain 16 grips the casing tightly.

[0044] Start motor 1, which drives drive shaft 4 to rotate. Drive shaft 4 drives transmission chain 16 to rotate via sprocket, thereby driving the sleeve to rotate and completing the sleeve fastening.

[0045] When the bushing is uncoupled, motor 1 reverses, causing the transmission chain 16 to drive the bushing to rotate in the opposite direction, thus removing it from the bushing coupling.

[0046] This hydraulic power tong uses a transmission chain with a belt to achieve undamaged casing connection and disconnection, effectively protecting the casing body and coupling surface from damage. The transmission chain is clamped by the clamping arm, and the motor drives the connection and disconnection. It has stable performance, high reliability, saves manpower, improves the operating efficiency of the casing tong, and reduces well completion costs.

[0047] The various embodiments of the present invention have been described above. These descriptions are exemplary and not exhaustive, nor are they limited to the disclosed embodiments. Many modifications and variations will be apparent to those skilled in the art without departing from the scope and spirit of the described embodiments. The terminology used herein is chosen to best explain the principles, practical application, or technical improvements to the embodiments in the market, or to enable others skilled in the art to understand the embodiments disclosed herein.

Claims

1. A friction belt type toothless hydraulic power pliers, comprising a support base (5) and a motor (1), wherein the motor (1) is fixed above the support base (5), characterized in that: The output shaft of the motor (1) is connected to the drive shaft (4), the drive shaft (4) is connected to the sprocket, and the sprocket is connected to the transmission chain (16); the support base (5) is connected to two clamping arms (12), the clamping arms (12) are driven by a hydraulic cylinder, and the transmission chain (16) passes around the two clamping arms (12) and then contacts the sleeve; the support base (5) is connected to a hydraulic arm (15), and the end of the hydraulic arm (15) is supported on the transmission chain (16).

2. The friction belt type toothless hydraulic power pliers according to claim 1, characterized in that: The transmission chain (16) includes a chain (161) and a belt (162) is provided on the outside of the chain (161).

3. The friction belt type toothless hydraulic power pliers according to claim 1 or 2, characterized in that: The end of the clamping arm (12) is connected to a circular clamping plate (11) at the corresponding position of the transmission chain (16). When the clamping arm (11) clamps the sleeve, the outer belt (162) of the transmission chain (16) contacts the sleeve after it passes around the clamping plates (11) on both sides.

4. The friction belt type toothless hydraulic power pliers according to claim 3, characterized in that: The torque monitor (17) is fixed on the outside of the support base (5).

5. The friction belt type toothless hydraulic power pliers according to claim 4, characterized in that: One end of the drive shaft (4) is connected to the output shaft of the motor (1), and the other end is connected to the bearing seat through a bearing. The bearing seat is fixed on the support seat (5).

6. The friction belt type toothless hydraulic power pliers according to claim 5, characterized in that: There are two transmission chains (16) arranged vertically along the drive shaft (4), and there are two hydraulic arms (15), with each transmission chain (16) corresponding to one hydraulic arm (15).

7. The friction belt type toothless hydraulic power pliers according to claim 6, characterized in that: The drive shaft (4) is provided with two sprockets, and each sprocket is connected to a transmission chain (16).

8. The friction belt type toothless hydraulic power pliers according to claim 5 or 6, characterized in that: The bottom of the support base (5) is connected to the back clamp (7) via a fixed pin (6). The bottom of the back clamp (7) is fixed on the back clamp support base (8). The back clamp (7) is provided with two back clamp clamping arms (10), and a back clamp hydraulic cylinder (9) is connected between the two back clamp clamping arms (10).

9. The friction belt type toothless hydraulic power pliers according to claim 8, characterized in that: When in use, place the back clamp support base (8) on the wellhead so that the back clamp clamping arm (10) clamps the casing coupling. Connect the sleeve to the sleeve coupling, start the hydraulic cylinder of the clamping arm (12), so that the clamping arm (12) drives the transmission chain (16) to clamp the sleeve; Start the hydraulic cylinder of the hydraulic arm (15), and the hydraulic arm (15) extends outward to tighten the transmission chain; Start the motor, and the motor (1) drives the drive shaft (4) to rotate. The drive shaft (4) drives the transmission chain (16) to rotate through the sprocket, thereby driving the sleeve to rotate.

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