Three-piece type die head of the non-marked casing tongs

Abstract

The utility model provides three piece formula e board's no pressure mark casing tong main pincer head, relate to petroleum drilling technical field, and the whole of pincer head main body is wholly set on the outer circle of petroleum casing, and pincer head main body connects e board frame, two swing e board assembly and fixed jaw plate assembly are all with e board frame fixedly connected, and fixed jaw plate assembly is located between two swing e board assembly, and the both ends are respectively hinged with corresponding swing e board assembly, when fixed jaw plate assembly and swing e board assembly embrace tightly petroleum casing, the included angle alpha of swing e board assembly and fixed jaw plate assembly's e board roller is 100 115 degrees.The utility model structure is reasonable, simple, compared with the existing two piece jaw plate structure, three piece jaw plate structure can more effectively change the toothed plate to casing normal pressure into the friction of toothed plate to casing, ensure that no pressure mark casing tong pincer head to the clamping force of casing, thereby reduce the wear and tear of toothed plate, can reduce the replacement frequency of toothed plate, save casing operation time.

Description

Technical Field

[0001] This utility model relates to the field of oil drilling technology, and more specifically, to the main jaw of a three-jaw tong with no indentation. Background Technology

[0002] In oil and gas field well downhole casing operations, casing wrenches are commonly used for coupling and uncoupling. Some casing wrenches include a main wrench and a back wrench. The back wrench holds the casing, and the main wrench drives the casing to couple and uncouple, ensuring reliable operation. Currently, casing wrench main wrenches generally adopt a two-jaw-plate structure, as shown in the following diagram. Figure 1 As shown, the included angle β of the jaw plate rollers is relatively small, resulting in relatively uneven force distribution and aggravating the wear of the jaw plate; at the same time, frequent replacement of the jaw plate wastes operation time and affects the quality of the upper and lower clips. Utility Model Content

[0003] The purpose of this utility model is to provide a non-marking sleeve wrench head with a three-piece jaw plate, so as to solve one or more problems mentioned in the background art.

[0004] To achieve the above objectives, this application provides a three-jaw plate non-indentation casing wrench main jaw head, including a jaw head body, a fixed jaw plate assembly, and two oscillating jaw plate assemblies. The jaw head body is integrally fitted onto the outer circumference of the oil casing. The upper and lower jaw plate frames are connected to the jaw head body. The two oscillating jaw plate assemblies and the fixed jaw plate assembly are fixedly connected to the jaw plate frames. The fixed jaw plate assembly is located between the two oscillating jaw plate assemblies, and its two ends are respectively hinged to the corresponding oscillating jaw plate assemblies. When the fixed jaw plate assembly and the oscillating jaw plate assembly grip the oil casing, the included angle α between the jaw plate rollers of the oscillating jaw plate assembly and the fixed jaw plate assembly is in the range of 100-115 degrees.

[0005] As a preferred embodiment, the jaw head body also includes a notched gear disposed on the jaw head body. The inner surface of the notched gear is configured as a curved surface, serving as a ramp for the rollers of the swing jaw assembly to climb. The rollers of each swing jaw assembly press against the corresponding ramp.

[0006] As a preferred embodiment, both oscillating jaw plate assemblies and the fixed jaw plate assembly are hinged to the jaw plate frame via jaw plate pins.

[0007] As a preferred feasible method, each swing jaw plate assembly and fixed jaw plate assembly is fixedly connected to a non-indented jaw plate, which fits against the outer circle of the oil casing.

[0008] As a preferred implementation method, when the jaw rollers of the swing jaw assembly climb the slope, the two swing jaw assemblies swing towards the oil casing until the three jaw plates fit against the outer circle of the oil casing, together gripping the oil casing, driving the casing to rotate, and completing the casing coupling and uncoupling.

[0009] Compared with the prior art, the beneficial effects of this utility model are:

[0010] 1. The present invention has a reasonable and simple structure. Compared with the existing two-jaw plate structure, the three-jaw plate structure has a more uniform arrangement of indentation-free jaw plates along the outer circumference of the oil casing.

[0011] 2. The included angle α of the jaw plate rollers in the three-jaw-plate structure is greater than the included angle β of the jaw plate rollers in the two-jaw-plate structure. This makes the force on the casing more uniform and can more effectively convert the positive pressure of the jaw plate on the casing into the frictional force of the jaw plate on the casing. This ensures the clamping force of the casing pliers head on the casing without indentation, thereby reducing the wear of the jaw plate, reducing the number of jaw plate replacements, and saving casing operation time.

[0012] 3. This structure ensures that the positive pressure of the toothed plate on the casing is appropriate, reduces the deformation of the shackle section on the casing, improves the quality of the shackle, and guarantees the airtightness of the tubing string. Therefore, it ensures normal production on the one hand, and generates considerable economic benefits on the other. Attached Figure Description

[0013] Figure 1 A schematic diagram of the existing technology of clamping two jaw plates with a clamping head;

[0014] Figure 2 A schematic diagram of the structure of the non-marking sleeve clamp head of the three-piece jaw plate provided by this utility model;

[0015] Figure 3 A schematic diagram of the clamping structure of the main jaw of the three-piece jaw plate non-marking sleeve pliers provided by this utility model;

[0016] Figure 4 A schematic diagram of the included angle of the rollers in the jaw plate of the three-jaw plate non-marking sleeve wrench main jaw provided by this utility model. Detailed Implementation

[0017] 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.

[0018] It should be noted that all uses of "first", "second", "third" and "fourth" in the embodiments of this utility model are for the purpose of distinguishing two entities or parameters with the same name but different names. It is clear that "first", "second", "third" and "fourth" are only for the convenience of expression and should not be construed as limiting the embodiments of this utility model. Subsequent embodiments will not explain this in detail.

[0019] In the description of this utility model, it should be understood that the terms "center", "lateral", "longitudinal", "front", "rear", "left", "right", "upper", "lower", "vertical", "horizontal", "top", "bottom", "inner", and "outer" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limiting the scope of protection of this utility model.

[0020] like Figure 1-4 As shown, this utility model provides a three-jaw plate non-marking casing wrench main jaw head, including a jaw head body, a fixed jaw plate assembly 5, and two swing jaw plate assemblies 2. The jaw head body is fitted onto the outer circumference of the oil casing 6. The inner surface of the notched gear on the jaw head body is designed as a curved surface, forming a ramp for the rollers to climb. The rollers of the two swing jaw plate assemblies 2 press against the ramp.

[0021] The jaw plate frame is fixedly connected to the lower part of the jaw head body. The two swing jaw plate assemblies 2 and the fixed jaw plate assembly are respectively hinged to the jaw plate frame by jaw plate pins. The fixed jaw plate assembly 5 is located between the two swing jaw plate assemblies 2, and its two ends are respectively hinged to the corresponding swing jaw plate assembly 2.

[0022] Each swing jaw plate assembly 2 and fixed jaw plate assembly 5 is fixedly connected with a non-indentation jaw plate, which fits against the outer circumference of the oil casing. The non-indentation jaw plates are arranged almost uniformly along the outer circumference of the oil casing.

[0023] When the notched gear rotates, the jaw rollers of the oscillating jaw assembly 2 climb the ramp, and the two oscillating jaw assemblies 2 oscillate, moving closer to the oil casing 6 until the three jaw plates are in contact with the outer circumference of the oil casing, clamping the oil casing together and driving the casing to rotate, completing the casing coupling and uncoupling. When the fixed jaw assembly and the oscillating jaw assembly 2 clamp the oil casing, the included angle α between the jaw rollers of the oscillating jaw assembly and the fixed jaw assembly ranges from 100 to 115 degrees, and the three jaw plates are nearly uniformly arranged. Therefore, this structure ensures uniform stress on the casing, reliably converts the jaw plate pressure on the casing into frictional force, and ensures reliable clamping force of the non-indentation casing pliers head on the casing, meeting the usage requirements.

[0024] like Figure 1 and Figure 4As shown, the casing with a three-jaw plate structure experiences more uniform stress. When the jaw plates clamp, the included angle α of the jaw plate rollers in the three-jaw plate structure is greater than the included angle β of the jaw plate rollers in the two-jaw plate structure. This allows for a more effective conversion of the positive pressure of the jaw plate on the casing into frictional force, ensuring a non-marking clamping force on the casing. While ensuring smooth uncoupling on the casing, the working pressure of the hydraulic motor can be adjusted more rationally, reducing the stress on the jaw plates in the three-jaw plate structure, thus reducing jaw plate wear, decreasing the frequency of jaw plate replacement, and saving casing operation time. Appropriate positive pressure from the jaw plate on the casing reduces deformation at the uncoupling points, improves uncoupling quality, and ensures the airtightness of the tubing string. This ensures normal production and generates considerable economic benefits.

[0025] The foregoing has shown and described the basic principles, main features, and advantages of this utility model. Those skilled in the art should understand that this utility model is not limited to the above embodiments. The embodiments and descriptions in the specification are merely preferred examples and are not intended to limit the utility model. Various changes and modifications can be made to this utility model without departing from its spirit and scope, and all such changes and modifications fall within the scope of the claimed utility model. The scope of protection of this utility model is defined by the appended claims and their equivalents.

Claims

1. A three-jaw plate non-marking sleeve pliers main pliers head, characterized in that, The jaw assembly includes a jaw head body, a fixed jaw plate assembly (5), and two swing jaw plate assemblies (2). The jaw head body is fitted on the outer circle of the oil casing (6). The jaw head body is connected to the jaw plate frame. The two swing jaw plate assemblies (2) and the fixed jaw plate assembly are both connected to the jaw plate frame (4). The fixed jaw plate assembly (5) is located between the two swing jaw plate assemblies (2), and its two ends are respectively hinged to the corresponding swing jaw plate assembly (2). When the fixed jaw plate assembly and the swing jaw plate assembly (2) grip the oil casing, the angle α between the jaw plate rollers of the swing jaw plate assembly and the fixed jaw plate assembly is in the range of 100-115 degrees. The jaw head body also includes a notched gear (1) provided on the jaw head body. The inner surface of the notched gear (1) is set as a curved surface, which serves as a ramp (9) for the rollers to climb on the swing jaw assembly (2). Each roller (10) of the swing jaw assembly (2) presses on the corresponding ramp.

2. The non-marking sleeve clamp head of the three-jaw plate according to claim 1, characterized in that: Both of the swing jaw plate assemblies (2) and the fixed jaw plate assembly are hinged to the jaw plate frame (4) via jaw plate pins (3).

3. The non-marking sleeve clamp head of the three-jaw plate according to claim 2, characterized in that: Each swing jaw plate assembly (2) and fixed jaw plate assembly (5) is fixedly connected to a non-indented jaw plate (8), which fits against the outer circle of the oil casing.

4. The non-marking sleeve clamp head of the three-jaw plate according to claim 3, characterized in that: When the jaw rollers of the swing jaw assembly (2) climb up the slope, the two swing jaw assemblies (2) swing towards the oil casing (6) until the three jaw plates fit together with the outer circle of the oil casing, hug the oil casing together, drive the casing to rotate, and complete the casing coupling.

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