Hydraulic clamping device for oil pipe or oil rod

Abstract

The utility model belongs to the technical field of oil field workover treatment related equipment, and particularly relates to a hydraulic clamping device for an oil pipe or an oil rod, which comprises a hollow shell, a cylinder body, an inner cylinder cover, an outer cylinder cover, a piston and slip blocks, and the two slip blocks clamp or loosen the oil pipe or the oil rod passing through a corresponding hole channel of a wellhead. The device provided by the utility model can be used for clamping an oil pipe and an oil rod which are put into a well mouth when the oil pipe and the oil rod are lifted and put down, so that the oil pipe and the oil rod cannot fall down or be jacked up, the oil pipe and the oil rod can be fixed at the positions required by a worker, the oil pipe and the oil rod can be safely and reliably assembled and disassembled, and potential safety hazards are eliminated. By using the device provided by the utility model, only one elevator can be used in the process of lifting and releasing an oil pipe and an oil rod, and the elevator can be always kept in a state of being connected with a crane, so that the operation of circularly disassembling, assembling and carrying two elevators by a worker is not needed, the manpower is effectively saved, and the working efficiency is improved.

Description

Technical Field

[0001] This utility model belongs to the technical field of equipment related to oilfield well workover operations, specifically a hydraulic clamping device for tubing or rods. Background Technology

[0002] In existing oilfield well workover operations, when pulling out tubing and rods, two clamps are typically used alternately to prevent the tubing or rod from falling into the wellhead. Specifically, for example, when pulling out tubing or rods, the first clamp is installed at the upper end of a section of tubing or rod located at the wellhead. A crane connects to the first clamp to lift the first section of tubing or rod. After the next section of tubing or rod emerges from the wellhead, the second clamp is used to secure the upper end of that section to prevent it from falling. The previous section of tubing or rod, along with the first clamp, is removed and placed on the ground. Then, the crane connects to the second clamp to lift the next section of tubing or rod, exposing the section after that at the wellhead and securing it with the first clamp. By repeating this process, all tubing or rods can be pulled out. A single lifting clamp typically weighs 60-70 kilograms. A well may have 200-500 tubing pipes. Each time a well worker lifts a tubing or rod, they must move the lifting clamp from the ground to the wellhead, which is usually about 1 meter high. Well workers often have to move the clamp up and down 400 to 1000 times in oily and watery conditions, making the work extremely strenuous and dangerous. Utility Model Content

[0003] To address the aforementioned problems, the purpose of this utility model is to provide a hydraulic clamping device for oil pipes or oil rods.

[0004] The objective of this utility model is achieved through the following technical solution:

[0005] A hydraulic clamping device for oil pipes or rods includes a hollow housing, a cylinder body, an inner cylinder head, an outer cylinder head, a piston, and a slip block;

[0006] The hollow shell has through-holes for the slip blocks extending from left to right, and also has through-holes corresponding to the wellhead extending from top to bottom. These through-holes connect to the slip blocks. An inner cylinder head is fixed to each of the left and right ends of the hollow shell. The side of each inner cylinder head away from the hollow shell connects to an opening at one end of a corresponding cylinder body. The opening at the end of each cylinder body away from the hollow shell connects to a corresponding outer cylinder head. Each assembly consisting of the inner cylinder head, cylinder body, and outer cylinder head is used in conjunction with a corresponding piston. Each piston is divided into... The piston head and piston rod are connected together. The piston head of each piston is located inside a corresponding cylinder. The outer circumferential dimension of the piston head of each piston matches the inner circumferential dimension of the corresponding cylinder. The piston rod of each piston extends from a corresponding inner cylinder head and into the slip block passage of the hollow shell. The end of the piston rod of each piston away from the piston head is connected to a corresponding slip block. The two slip blocks are symmetrically located on the left and right sides of the corresponding passage of the wellhead and are used to directly clamp the oil pipe or oil rod.

[0007] An oil space A is formed in the inner cavity of each piston, between the piston head of the corresponding piston and the corresponding inner cylinder head, and an oil space B is formed in the inner cavity of each piston, between the piston head of the corresponding piston and the corresponding outer cylinder head.

[0008] The hollow shell is fixed to the wellhead by wellhead connecting bolts. Several wellhead connecting bolt holes are opened on the top and / or bottom surfaces of the hollow shell, and each wellhead connecting bolt hole is connected to the wellhead connecting bolt by thread.

[0009] Each piston has a number of cylinder head connecting bolts on its outer periphery. The outer cylinder head and the inner cylinder head, located on the same side of the hollow housing, are connected and fixed by the cylinder head connecting bolts.

[0010] Each piston has several sealing rings A on the outer circumferential surface of its piston head.

[0011] Each inner cylinder head is provided with several sealing rings B at the point where the piston rod of the corresponding piston passes through.

[0012] A hollow oil passage pipe is provided between each inner cylinder head and its corresponding outer cylinder head. The hollow shell and each inner cylinder head together form an integral oil passage A and an oil passage B. Each outer cylinder head has an oil passage C inside. Each oil passage C has an inlet port and an outlet port. The outlet port of each oil passage C is connected to a corresponding oil space B. The inlet port of each oil passage C is connected to one end of a corresponding hollow oil passage pipe. Each oil passage B has a... The oil channel B has one inlet port and two outlet ports. Each outlet port of the oil channel B is connected to the other end of the corresponding hollow oil passage pipe. The oil channel A has one inlet port and two outlet ports. Each outlet port of the oil channel A is connected to a corresponding oil space A. The inlet ports of the oil channel B and the oil channel A are both located on the hollow shell. Oil pipe interface flanges are respectively provided on the hollow shell at the locations corresponding to the inlet ports of the oil channel B and the oil channel A.

[0013] Each of the slip blocks has a transverse locking groove formed on the side surface near the piston it is connected to. The transverse locking groove of each slip block is parallel to the front-back direction of the hollow shell. The piston rod of each piston has a locking protrusion formed at the end away from the piston head. The locking protrusion of each piston is engaged in the transverse locking groove of the corresponding slip block. The shape of the locking protrusion of each piston matches the shape of the transverse locking groove of the corresponding slip block.

[0014] All of the aforementioned transverse snap-fit ​​slots are T-shaped slots.

[0015] Each of the slip blocks has an arc-shaped locking groove formed on the side away from the piston it is connected to. The arc-shaped locking grooves of the two slip blocks are used to directly clamp the tubing or rod from both sides of the wellhead corresponding channel passing through the hollow shell. Several wedge-shaped locking protrusions are evenly protruding on the inner side of each arc-shaped locking groove.

[0016] Each of the slip blocks is connected to an indicator block on its outer side. The front and rear sides of the hollow shell are respectively provided with indicator block passages that are connected to the slip block passages. The indicator blocks on each slip block protrude from their respective indicator block passages.

[0017] The advantages and positive effects of this utility model are as follows:

[0018] 1. The device proposed in this utility model can clamp the tubing and rod inserted into the wellhead during the raising and lowering of tubing and rod, preventing the tubing and rod from falling down and rising up. It can also fix the tubing and rod in the position desired by the operator, enabling safe and reliable loading and unloading of tubing and rod, and eliminating safety hazards.

[0019] 2. By using the device proposed in this utility model, only one lifting clamp can be used during the lifting and lowering of oil pipes and oil rods, and the lifting clamp can always be kept connected to the crane. There is no need for workers to repeatedly disassemble and move two lifting clamps, which effectively saves manpower and improves work efficiency. Attached Figure Description

[0020] Figure 1 This is a schematic diagram of the overall front view structure of this utility model;

[0021] Figure 2 This is a top view of the overall structure of this utility model;

[0022] Figure 3 This is a side view of the hollow shell structure of this utility model;

[0023] Figure 4 This is a front view structural diagram of the hollow shell of this utility model;

[0024] Figure 5 This is a structural schematic diagram of the side of the inner cylinder head away from the hollow shell of this utility model;

[0025] Figure 6 This is a schematic diagram of the structure of the outer cylinder head of this utility model, near the hollow shell.

[0026] Figure 7 This is a cross-sectional structural diagram of the piston of this utility model.

[0027] Figure 8 This is a schematic diagram of the external structure of the locking block of this utility model;

[0028] Figure 9 This is one of the cross-sectional structural diagrams of the locking block of this utility model;

[0029] Figure 10 This is the second schematic diagram of the cross-sectional structure of the locking block of this utility model.

[0030] In the diagram: 1 is the hollow shell, 101 is the slip block passage, 102 is the wellhead corresponding passage, 103 is the wellhead connecting bolt hole, and 104 is the indicator block passage.

[0031] 2 is the cylinder block, 3 is the inner cylinder head, 4 is the outer cylinder head, 5 is the piston, 501 is the piston head, 502 is the piston rod, 503 is the snap-fit ​​protrusion, 6 is the slip block, 601 is the transverse snap-fit ​​groove, 602 is the arc-shaped snap-fit ​​groove, 603 is the wedge-shaped snap-fit ​​protrusion, and 604 is the indicator block mounting groove.

[0032] 7 is the cylinder head connecting bolt, 8 is the sealing ring A, 9 is the sealing ring B, 10 is the hollow oil passage pipe, and 11 is the oil pipe interface flange.

[0033] 001 is oil space A, 002 is oil space B, 003 is oil channel A, 004 is oil channel B, and 005 is oil channel C. Detailed Implementation

[0034] The following is in conjunction with the appendix Figure 1-10 The present invention will be described in further detail.

[0035] A hydraulic clamping device for tubing or rods, such as Figure 1-10 As shown, this embodiment includes a hollow shell 1, a cylinder 2, an inner cylinder head 3, an outer cylinder head 4, a piston 5, and a slip block 6.

[0036] The hollow shell 1 has a left-right through-hole 101 for passing slips, and a top-bottom through-hole 102 corresponding to the wellhead. The wellhead corresponding through-hole 102 is connected to the slip through-hole 101. The wellhead corresponding through-hole 102 corresponds to the wellhead position and is used to allow the tubing or rod to pass through. An inner cylinder head 3 is fixed to each of the left and right ends of the hollow shell 1 by screws. The side of each inner cylinder head 3 away from the hollow shell 1 is connected to one end opening of a corresponding cylinder body 2. The end opening of each cylinder body 2 away from the hollow shell 1 is connected to a corresponding outer cylinder head 4. Each assembly consisting of the corresponding inner cylinder head 3, cylinder body 2, and outer cylinder head 4 is used in conjunction with a corresponding piston 5. Each piston 5 is divided into a piston head 501 and a piston rod 502 connected together. The piston head 501 of each piston 5 is located at the corresponding... Inside each cylinder 2, the outer circumferential dimension of the piston head 501 of each piston 5 is matched with the inner circumferential dimension of the corresponding cylinder 2. The piston rod 502 of each piston 5 extends from a corresponding inner cylinder head 3 and into the slip block passage 101 of the hollow shell 1. The end of the piston rod 502 of each piston 5 away from the piston head 501 of that piston 5 is connected to a corresponding slip block 6. The two slip blocks 6 are symmetrically located on the left and right sides of the corresponding passage 102 at the wellhead and are used to directly clamp the oil pipe or oil rod.

[0037] In the inner cavity of each piston 5, an oil space A 001 is formed between the piston head 501 of the corresponding piston 5 and the corresponding inner cylinder head 3. In the inner cavity of each piston 5, an oil space B 002 is formed between the piston head 501 of the corresponding piston 5 and the corresponding outer cylinder head 4. By controlling the inflow and outflow of hydraulic oil in oil spaces A 001 and B 002 respectively, the piston 5 is driven to move axially, thereby controlling the two slip blocks 6 to clamp or release the oil pipe or rod passing through the corresponding wellhead passage 102. In this embodiment, each piston 5 also has a blind hole connected to the corresponding oil space B 002, so that oil spaces B 002 and blind holes can accommodate more hydraulic oil, making the piston 5's operation more reliable. When running out of tubing and rods, the device proposed in this invention can clamp the tubing and rods placed at the wellhead, preventing them from falling or rising (falling refers to the tubing and rods dropping into the well, while rising refers to the tubing flying out due to high pressure in the well, which is extremely dangerous). It also secures the tubing and rods in the desired position for the workers, enabling safe and reliable loading and unloading. Furthermore, during the running out of tubing and rods, only one lifting clamp can be used, and this clamp can be kept connected to the crane at all times, eliminating the need for workers to repeatedly disassemble and move two clamps, effectively saving manpower and improving work efficiency.

[0038] Specifically, in this embodiment, the hollow shell 1 is fixed to the wellhead by wellhead connecting bolts. Eight wellhead connecting bolt holes 103 are provided on both the top and bottom surfaces of the hollow shell 1. Each wellhead connecting bolt hole 103 is threadedly connected to the wellhead connecting bolt, allowing both the top and bottom surfaces of the hollow shell 1 to be connected to the wellhead for convenient use. The connection method at the wellhead and between the hollow shell 1 and the wellhead connecting bolts adopts existing technology.

[0039] Specifically, in this embodiment, each piston 5 is provided with four cylinder head connecting bolts 7 on its outer periphery. The outer cylinder head 4 and the inner cylinder head 3, located on the same side of the hollow housing 1, are connected and fixed by the cylinder head connecting bolts 7, ensuring a tight and reliable connection between the outer cylinder head 4, the cylinder body 2, and the inner cylinder head 3. Several sealing rings A8 are provided on the outer periphery of the piston head 501 of each piston 5, and several sealing rings B9 are provided on each inner cylinder head 3 at the point where the piston rod 502 of the corresponding piston 5 passes through, ensuring that hydraulic oil does not leak and that the piston 5 operates reliably and stably.

[0040] Specifically, such as Figure 1-6As shown, in this embodiment, a hollow oil passage pipe 10 is provided between each inner cylinder head 3 and the corresponding outer cylinder head 4. The hollow shell 1 and each inner cylinder head 3 form an integral structure with an oil passage A 003 and an oil passage B 004 inside. Each outer cylinder head 4 has an oil passage C 005 inside. Each oil passage C 005 has one inlet port and one outlet port. The outlet port of each oil passage C 005 is connected to a corresponding oil space B 002. The inlet port of each oil passage C 005 is connected to one end of a corresponding hollow oil passage pipe 10. Oil passage B 004 has one inlet port and two outlet ports. Each outlet port of oil passage B 004 is connected to the other end of the corresponding hollow oil passage pipe 10. Oil passage A 003 has one inlet port and two outlet ports. Each outlet port of oil passage A 003 is connected to a corresponding oil space A The hydraulic system is interconnected. The inlet ports of hydraulic channels B 004 and A 003 are both located on the hollow shell 1. Corresponding to the inlet ports of hydraulic channels B 004 and A 003, hydraulic pipe interface flanges 11 are respectively provided on the hollow shell 1. Hydraulic oil is supplied or discharged to the hydraulic space A 001 through hydraulic channel A 003, and through hydraulic channels B 004, the hollow hydraulic through pipe 10, and hydraulic channel C 005. An external hydraulic oil supply device is connected via the hydraulic pipe interface flanges 11. The structure is compact. The connection method between the hydraulic pipe interface flanges 11 and the external hydraulic oil supply device adopts existing technology.

[0041] Specifically, such as Figure 7-10As shown, in this embodiment, a transverse engaging groove 601 is formed on the side of each slip block 6 near the piston 5 it is connected to. The transverse engaging groove 601 of each slip block 6 is parallel to the front-back direction of the hollow shell 1. A engaging protrusion 503 is formed at the end of the piston rod portion 502 of each piston 5 away from the piston head 501. The engaging protrusion 503 of each piston 5 engages with the corresponding transverse engaging groove 601 of the slip block 6. The shape of the engaging protrusion 503 of each piston 5 matches the shape of the corresponding transverse engaging groove 601 of the slip block 6. Each transverse engaging groove 601 is a T-shaped groove, ensuring reliable engagement between the engaging protrusion 503 and the transverse engaging groove 601. Each slip block 6 has an arc-shaped locking groove 602 formed on the side away from the connected piston 5. The arc-shaped locking grooves 602 of the two slip blocks 6 are used to directly clamp the tubing or rod from both sides of the wellhead corresponding to the orifice 102 passing through the hollow shell 1. Several wedge-shaped locking protrusions 603 are evenly protruding on the inner side of each arc-shaped locking groove 602, which can achieve reliable clamping of the tubing or rod. The lateral width of each slip block 6 is slightly smaller than the width of the inner side of the slip block through the orifice 101, which allows each slip block 6 to have a certain amount of lateral movement in the slip block through the orifice 101. With the setting of the arc-shaped locking grooves 602, it can adapt to the slightly skewed tubing or rod and achieve stable clamping. Each locking block 6 has an indicator block (omitted in the figure) connected to its outer side. Each locking block 6 may also have an indicator block mounting groove 604 for easy positioning and installation of the indicator block. The front and rear sides of the hollow shell 1 are respectively provided with indicator block passages 104 that communicate with the locking block passages 101. The indicator blocks on each locking block 6 protrude from their corresponding indicator block passages 104. By setting the indicator blocks, it is convenient for workers to observe the movement position of the locking blocks 6.

Claims

1. A hydraulic clamping device for oil pipes or oil rods, characterized in that: It includes a hollow shell (1), a cylinder block (2), an inner cylinder head (3), an outer cylinder head (4), a piston (5), and a slip block (6); The hollow shell (1) has a through-hole (101) for the slip block, and a through-hole (102) for the wellhead, which is connected to the slip block through-hole (101). An inner cylinder head (3) is fixed to each of the left and right ends of the hollow shell (1). The side of each inner cylinder head (3) away from the hollow shell (1) is connected to one end opening of a corresponding cylinder body (2). The end opening of each cylinder body (2) away from the hollow shell (1) is connected to a corresponding outer cylinder head (4). Each assembly consisting of the corresponding inner cylinder head (3), cylinder body (2), and outer cylinder head (4) is used in conjunction with a corresponding piston (5). Each piston (5) is divided into sections connected together. The piston head (501) and piston rod (502) of each piston (5) are located inside the corresponding cylinder (2), and the outer peripheral surface size of the piston head (501) of each piston (5) is matched with the inner peripheral surface size of the corresponding cylinder (2). The piston rod (502) of each piston (5) extends from the corresponding inner cylinder cover (3) and extends into the slip block passage (101) of the hollow shell (1). The piston head (501) of the piston rod (502) of each piston (5) is connected to a corresponding slip block (6). The two slip blocks (6) are symmetrically located on the left and right sides of the corresponding passage (102) of the wellhead and are used to directly clamp the oil pipe or oil rod. An oil space A (001) is formed in the inner cavity of each piston (5) between the piston head (501) of the corresponding piston (5) and the corresponding inner cylinder head (3), and an oil space B (002) is formed in the inner cavity of each piston (5) between the piston head (501) of the corresponding piston (5) and the corresponding outer cylinder head (4).

2. The hydraulic clamping device for oil pipes or rods according to claim 1, characterized in that: The hollow shell (1) is fixed to the wellhead by wellhead connecting bolts. Several wellhead connecting bolt holes (103) are provided on the top and / or bottom surfaces of the hollow shell (1). Each wellhead connecting bolt hole (103) is connected to the wellhead connecting bolt by thread.

3. A hydraulic clamping device for oil pipes or rods according to claim 1, characterized in that: Each piston (5) has several cylinder head connecting bolts (7) on its outer periphery. The outer cylinder head (4) and the inner cylinder head (3) located on the same side of the hollow housing (1) are connected and fixed by the cylinder head connecting bolts (7).

4. A hydraulic clamping device for oil pipes or rods according to claim 1, characterized in that: Each piston (5) has several sealing rings A (8) on the outer peripheral surface of the piston head (501).

5. A hydraulic clamping device for oil pipes or rods according to claim 1, characterized in that: Each inner cylinder head (3) is provided with several sealing rings B (9) at the point where the piston rod portion (502) of the corresponding piston (5) passes through.

6. A hydraulic clamping device for oil pipes or rods according to claim 1, characterized in that: A hollow oil passage pipe (10) is provided between each inner cylinder head (3) and the corresponding outer cylinder head (4). The hollow shell (1) and each inner cylinder head (3) form an integral structure with an oil passage A (003) and an oil passage B (004) inside. Each outer cylinder head (4) has an oil passage C (005) inside. Each oil passage C (005) has an inlet port and an outlet port. The outlet port of each oil passage C (005) is connected to a corresponding oil space B (002). The inlet port of each oil passage C (005) is connected to one end of a corresponding hollow oil passage pipe (10). The oil passage B (004)... The oil channel B (004) has one inlet port and two outlet ports. Each outlet port of the oil channel B (004) is connected to the other end of the corresponding hollow oil passage pipe (10). The oil channel A (003) has one inlet port and two outlet ports. Each outlet port of the oil channel A (003) is connected to a corresponding oil space A (001). The inlet ports of the oil channel B (004) and the oil channel A (003) are both located on the hollow shell (1). Oil pipe interface flanges (11) are respectively provided on the hollow shell (1) at the locations corresponding to the inlet ports of the oil channel B (004) and the oil channel A (003).

7. A hydraulic clamping device for oil pipes or rods according to claim 1, characterized in that: Each of the slip blocks (6) has a transverse locking groove (601) formed on the side surface near the piston (5) to which it is connected. The transverse locking groove (601) of each slip block (6) is parallel to the front-back direction of the hollow shell (1). The piston rod portion (502) of each piston (5) has a locking protrusion (503) formed at one end of the piston head (501) away from the piston (5). The locking protrusion (503) of each piston (5) is locked into the transverse locking groove (601) of the corresponding slip block (6). The shape of the locking protrusion (503) of each piston (5) matches the shape of the transverse locking groove (601) of the corresponding slip block (6).

8. A hydraulic clamping device for oil pipes or rods according to claim 7, characterized in that: Each of the transverse snap-fit ​​grooves (601) is a T-shaped groove.

9. A hydraulic clamping device for oil pipes or rods according to claim 1, characterized in that: Each of the slip blocks (6) has an arc-shaped locking groove (602) formed on the side away from the piston (5) it is connected to. The arc-shaped locking grooves (602) of the two slip blocks (6) are used to directly clamp the oil pipe or oil rod from both sides of the wellhead corresponding channel (102) passing through the hollow shell (1). A number of wedge-shaped locking protrusions (603) are uniformly protruded on the inner side of each arc-shaped locking groove (602).

10. A hydraulic clamping device for oil pipes or rods according to claim 1, characterized in that: Each of the slip blocks (6) is connected to an indicator block on its outer side. The front and rear sides of the hollow shell (1) are respectively provided with indicator block passages (104) that are connected to the slip block passages (101). The indicator blocks on each slip block (6) pass through the corresponding indicator block passages (104).

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