Multi-specification variable-diameter roller square bushing

Abstract

The utility model provides a multi-specification reducing roller square bushing, which belongs to the field of petroleum well drills, and comprises a square bushing body, four rollers and a shaft, a square hole is arranged on the square bushing body, the four rollers are arranged in a cross shape, the centers of the four rollers form an inner square hole used for inserting a kelly bar, the shaft is an eccentric shaft, and the square hole is communicated with the shaft. The eccentric shaft is arranged in the middle of the rollers and matched with a square hole in the square bushing core body, shaft heads at the two ends of the eccentric shaft are square shaft heads with different specifications and are eccentric with the axis, and the two opposite rollers are as wide as the kelly bar with the largest specification in the four kelly bars. According to the utility model, the internal and external directions of the eccentric distance are changed by adjusting the internal and external directions of the eccentric shaft, so that the opening degree of the internal square hole is changed, and the kelly bars with four specifications can be adapted to meet the new process requirements of deep well drilling.

Description

Technical Field

[0001] This utility model relates to the field of oil drilling machine technology, specifically to multi-specification variable diameter roller square manifold. Background Technology

[0002] Traditional square cores have fixed dimensions. However, in actual drilling operations, different drilling projects have varying requirements for the dimensions of drill bits and matching square drill pipes, often necessitating the preparation of square cores in multiple sizes. This results in a large stockpile of square cores of different sizes at the drilling site, occupying significant storage space and making the process of finding suitable cores when replacing square drill pipes cumbersome, severely impacting drilling efficiency. Furthermore, traditional square cores and square drill pipes primarily transmit torque through sliding friction. During prolonged drilling operations, this sliding friction leads to severe wear at the contact points between the square core and the square drill pipe. On one hand, frequent wear of the square core necessitates periodic replacement, increasing operating costs and downtime; on the other hand, wear on the surface of the square drill pipe reduces its strength and service life, potentially even posing safety hazards.

[0003] To address the problems of traditional square drill pipe mandrels, the applicant previously disclosed a variable-diameter roller square drill pipe mandrel in patent application CN 202125243U. This mandrel uses an eccentric shaft to fix four rollers, and the diameter is changed by altering the roller positions. However, this patented variable-diameter roller square drill pipe mandrel can only accommodate two drill pipe sizes, which does not meet the technological requirements of new deep well drilling. Utility Model Content

[0004] The purpose of this invention is to overcome the shortcomings and deficiencies of the existing technology and to provide a multi-specification variable diameter roller square mandrel.

[0005] The technical solution adopted by this utility model is as follows: This application provides a multi-specification variable diameter roller square core, including a square core body, rollers and a shaft. The square core body is provided with a square hole. Four rollers are provided, arranged in a cross shape, and the center of the four rollers forms an inner square hole for inserting a square drill rod. The shaft is an eccentric shaft, which is located in the middle of the rollers and cooperates with the square hole on the square core body. The shaft ends of the eccentric shaft are square shaft ends of different specifications and are eccentric to the shaft center. Of the four rollers, two opposite rollers have the same width as the largest specification square drill rod among the four types of square drill rods, and the other two opposite rollers have the same width as the smallest specification square drill rod among the four types of square drill rods. By adjusting the inward and outward directions of the eccentric shaft, the inward and outward directions of the eccentricity are changed, thereby changing the opening of the inner square hole.

[0006] In some embodiments, the rotation of the eccentric shaft drives the movement of the corresponding rollers, and the four rollers form an inner square hole of a certain size for every 90° change in the eccentricity.

[0007] In some embodiments, the size of the inner square hole formed by the four rollers when the eccentricity is outward is greater than the size of the inner square hole formed by the four rollers when the eccentricity is inward.

[0008] In some embodiments, the four rollers are arranged such that two opposite rollers form one pair and two opposite rollers form another pair, and the two pairs of rollers can alternately change their orientation.

[0009] In some embodiments, the system further includes an upper cover and a lower seat, the upper cover being disposed on the upper end of the lower seat, and the roller being disposed inside the lower seat.

[0010] The beneficial effects of this utility model are as follows: This utility model has higher functionality and applicability. It can achieve the purpose of transmitting torque and feed by drilling machines using four specifications of square drill rods by simply changing the eccentricity of the eccentric shaft by changing the inner and outer directions of the eccentric core without replacing the square core. Furthermore, of the four rollers of the square core, two opposite rollers are the same width as the maximum square drill rod width matched with the diameter change, and the other two rollers are the same width as the minimum specification of the four square drill rods after the diameter change, so that the extrusion trajectory is different during operation and the diameter is changed to different specifications. In addition, the two pairs of rollers in this utility model can alternately change the orientation to achieve four specifications of diameter change, which can extend the life of the square drill rod by more than four times. Attached Figure Description

[0011] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, obtaining other drawings based on these drawings without creative effort still falls within the scope of this utility model.

[0012] Figure 1 This is a schematic diagram of the installation and transmission of this utility model;

[0013] Figure 2 This is a horizontal cross-sectional view of the multi-specification variable diameter roller square core of this utility model;

[0014] Figure 3 This is a schematic diagram of a partial cross-section of the eccentric shaft head in this utility model. Figure 1 ;

[0015] Figure 4 This is a schematic diagram of a partial cross-section of the eccentric shaft head in this utility model. Figure 2 . Detailed Implementation

[0016] The following description provides specific application scenarios and requirements for this specification, intended to enable those skilled in the art to make and use the contents of this specification. Various partial modifications to the disclosed embodiments will be apparent to those skilled in the art, and the general principles defined herein can be applied to other embodiments and applications without departing from the spirit and scope of this specification. Therefore, this specification is not limited to the embodiments shown, but rather to the widest scope consistent with the claims.

[0017] In the description of this application, it should be noted that, unless otherwise expressly specified and limited, the terms "longitudinal", "lateral", "radial", "length", "width", "thickness", "upper", "lower", "left", "right", "front", "rear", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. These terms are mainly for the purpose of better describing this application and its embodiments, and are not intended to limit the indicated device, element or component to have a specific orientation, or to be constructed and operated in a specific orientation.

[0018] Secondly, the terms "first," "second," and similar words do not indicate any order, quantity, or importance, but are merely used to distinguish different components and should not be construed as limiting the embodiments of this application.

[0019] Furthermore, the terms "installation," "setup," "equipped with," "connection," and "connected" should be interpreted broadly. For example, they can refer to fixed connections, detachable connections, or integral constructions; they can refer to mechanical connections or electrical connections; they can refer to direct connections or indirect connections through an intermediate medium, or internal connections between two devices, components, or parts.

[0020] Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances.

[0021] Regarding the accompanying drawings of this application, it should be clearly understood that the drawings are for illustrative and descriptive purposes only and are not intended to limit the scope of this specification. It should also be understood that the drawings are not drawn to scale.

[0022] This application is an improvement based on the applicant's earlier patent application with publication number CN 202125243U, which discloses a variable diameter roller square mandrel, but it can only meet the requirements of two specifications of drill pipe, which cannot meet the process requirements of new deep well drilling.

[0023] Based on the above issues, such as Figures 1 to 4As shown, this application provides a multi-specification variable diameter roller square mandrel, including an upper cover 1, a lower seat 2, a square mandrel body 6, rollers 3, and a shaft 5. The upper cover 1 is disposed on the upper end of the lower seat 2, and the rollers 3 are disposed inside the lower seat 2. The square mandrel body 6 is provided with a square hole, and four rollers 3 are provided, arranged in a cross shape. The centers of the four rollers 3 form an inner square hole for inserting a square drill rod 4, which is the outer square drill rod. The shaft 5 is an eccentric shaft, which is disposed in the middle of the rollers 3 and mates with the square hole on the square mandrel body 6. The shaft ends of the eccentric shaft are square shaft ends of different specifications and are eccentric to the shaft center. Based on this structure, it is further configured that: of the four rollers 3, the width of the two opposite rollers 3 is equal to the width of the largest specification square drill rod 4 among the four types of square drill rods 4. Similarly, the two opposite rollers 3 have the same width as the smallest square drill rod 4 among the four types of square drill rods 4. This allows the inner and outer directions of the eccentricity to be changed by adjusting the inner and outer directions of the eccentric shaft, thereby changing the opening of the inner square hole. Specifically, without replacing the square core, simply changing the inner and outer directions of the eccentricity of the eccentric shaft can achieve the purpose of transmitting torque and feed when using four types of square drill rods. Furthermore, of the four rollers of the square core, two opposite rollers have the same width as the largest square drill rod that matches the diameter change, and the other two rollers have the same width as the smallest square drill rod of the four types after the diameter change, so that the extrusion trajectory is different during operation, and the diameter is changed to different specifications. Moreover, the two pairs of rollers in this utility model can alternately change their orientation to achieve four specifications of diameter change, which can extend the life of the square drill rod by more than four times, which is a great improvement compared to the prior application.

[0024] In addition, it has better functionality and greater applicability.

[0025] The rotation of the eccentric shaft drives the movement of the corresponding roller 3. For every 90° change in the eccentricity, the four rollers 3 form an inner square hole of one specification. Therefore, when the eccentricity changes by 360°, it changes into four specifications of inner square holes, which can be adapted to four different specifications of square drill rods 4.

[0026] In some embodiments, when the eccentricity is outward, the size of the inner square hole formed by the four rollers 3 is larger than the size of the inner square hole formed by the four rollers 3 when the eccentricity is inward. Specifically, when the eccentricity is inward, the four rollers 3 form a small inner square hole, and when the eccentricity is outward, the four rollers 3 form a large inner square hole.

[0027] In some embodiments, the four rollers are arranged such that two opposite rollers 3 form one pair of rollers, and the other two opposite rollers 3 form another pair of rollers. The two pairs of rollers can alternately change their orientation to achieve the effect of changing the diameter.

[0028] It is understandable that during use, the eccentricity generated between the eccentric shaft and the shaft center is used to drive the rotation of the eccentric shaft, and the rotation of the eccentric shaft drives the movement of the roller 3. Adjusting the inward and outward directions of the eccentric shaft changes the inward and outward directions of the eccentricity, which enables the roller 3 to move back and forth, thereby changing the opening of the inner square hole to adapt to different specifications of square drill rods 4.

[0029] Typically, during drilling operations, when handling drilling accidents, drill pipe of a smaller size than the nearest available size is used. For example, if 5 1 / 4" outer diameter drill pipe is used for drilling, 3 1 / 2" outer diameter drill pipe is generally used for handling accidents; similarly, if 3 1 / 2" outer diameter drill pipe is used for drilling, 2 7 / 8" outer diameter drill pipe is generally used. Basically, using a drill pipe of one size smaller is sufficient. Modern deep well drilling technology involves changing to a smaller size at a certain depth to reduce friction between the tubing and the wellhead, thereby improving the efficiency of the drilling rig.

[0030] In summary, the use of this multi-specification variable diameter roller square mandrel not only achieves the function of changing the diameter of more specifications, but also overcomes the shortcomings of existing technologies in deep well operations, fills a gap, and at the same time extends the service life of square drill pipes.

[0031] In summary, after reading this detailed disclosure, those skilled in the art will understand that the foregoing detailed disclosure is presented by way of example only and is not restrictive. Although not explicitly stated herein, those skilled in the art will understand that the requirements of this application encompass various reasonable changes, improvements, and modifications to the embodiments. These changes, improvements, and modifications are intended to be made by this application and are within the spirit and scope of the exemplary embodiments of this application.

[0032] Furthermore, it should be understood that in the foregoing description of the embodiments of this application, various features are combined in a single embodiment, drawing, or description for the purpose of simplifying the understanding of a feature. However, this does not mean that the combination of these features is necessary, and those skilled in the art may readily identify some of the devices as separate embodiments when reading this application. That is, the embodiments in this application can also be understood as an integration of multiple sub-embodiments. It is also valid when each sub-embodiment contains fewer than all the features of a single foregoing disclosed embodiment.

[0033] Finally, it should be understood that the embodiments disclosed herein are illustrative of the principles of the embodiments of this application. Other modified embodiments are also within the scope of this application. Therefore, the embodiments disclosed herein are merely examples and not limitations. Those skilled in the art can adopt alternative configurations to implement the applications in this application based on the embodiments in this application. Therefore, the embodiments of this application are not limited to the embodiments precisely described in the application.

Claims

1. A multi-specification variable diameter roller square core, comprising a square core body (6), rollers (3) and a shaft (5), wherein the square core body (6) is provided with a square hole, and four rollers (3) are provided, the four rollers (3) are arranged in a cross shape, and the center of the four rollers (3) forms an inner square hole for inserting a square drill rod (4), the shaft (5) is an eccentric shaft, the eccentric shaft is located in the middle of the rollers (3) and mates with the square hole on the square core body (6), and the shaft ends of the eccentric shaft are square shaft ends of different specifications, and are eccentric to the shaft center, characterized in that, The four rollers (3) have the same width as the largest square drill rod (4) among the four types of square drill rods (4), and the other two rollers (3) have the same width as the smallest square drill rod (4) among the four types of square drill rods (4). The opening of the inner square hole is changed by adjusting the inner and outer directions of the eccentric shaft to change the inner and outer directions of the eccentricity.

2. The multi-specification variable diameter roller square mandrel according to claim 1, characterized in that, The rotation of the eccentric shaft drives the movement of the corresponding roller (3). For every 90° change in the eccentricity, the four rollers (3) form an inner square hole of a certain size.

3. The multi-specification variable diameter roller square mandrel according to claim 2, characterized in that, When the eccentricity is outward, the size of the inner square hole formed by the four rollers (3) is greater than the size of the inner square hole formed by the four rollers (3) when the eccentricity is inward.

4. The multi-specification variable diameter roller square mandrel according to claim 2, characterized in that, The four rollers, wherein two opposite rollers (3) form one pair of rollers and the other two opposite rollers (3) form another pair of rollers, and the two pairs of rollers can alternately change their orientation.

5. The multi-specification variable diameter roller square mandrel according to claim 1, characterized in that, It also includes an upper cover (1) and a lower seat (2), wherein the upper cover (1) is disposed on the upper end of the lower seat (2) and the roller (3) is disposed inside the lower seat (2).

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