Asymmetric three-petal arc-shaped rib wing screw centralizer

Abstract

The utility model discloses an asymmetric three-petal arc-shaped rib wing screw centralizer which comprises a centralizer screw body, the two ends of the centralizer screw body are provided with connectors, a first arc-shaped rib wing is fixedly arranged on the periphery of the middle of the centralizer screw body, and a second arc-shaped rib wing is fixedly arranged on the periphery of the middle of the centralizer screw body. A second arc-shaped rib wing and a third arc-shaped rib wing are fixedly arranged on the periphery of the middle part of the centralizer screw rod body between 90 degrees and 120 degrees relative to the left side part and the right side part of the first arc-shaped rib wing respectively; by arranging the first arc-shaped rib wing, the second arc-shaped rib wing and the third arc-shaped rib wing and adopting asymmetrical layout structures with different sizes, the asymmetrical three-petal arc-shaped rib wing screw centralizer solves or relieves well wall instability and collapse caused by complex geological reasons in the drilling process of a coal seam well section; and therefore, the problems of difficulty in pulling out of the drill, difficulty in circulation and easiness in jamming of the drill are solved.

Description

Technical Field

[0001] The present application relates to the technical field of centralizers, and more particularly, to an asymmetric three-lobe arc rib wing screw centralizer. Background Art

[0002] A centralizer, also known as a stabilizer, is a tool for stabilizing downhole drill tools during drilling. The centralizer mainly serves as an engineering tool to prevent inclination. The installation position of the centralizer is on a section of drill pipe string connected near the large-diameter drill tool, which is a mechanical device for stabilizing the drilling direction and is also one of the important tools for preventing well deviation changes in natural gas, oil, and geological exploration drilling projects.

[0003] The screw centralizers produced by the prior art are suitable for drilling operations in relatively stable coal seam sections. When encountering downhole complexities caused by geological reasons, downhole accidents are extremely likely to occur during the complex treatment process, or a large amount of time is consumed in dealing with downhole complexities, resulting in huge cost losses. Therefore, the current technology still has the following defects:

[0004] (1) During the drilling process of a coalbed methane horizontal well, when the screw of the existing spiral centralizer encounters downhole complexities caused by a coal seam fracture zone or a structural zone, due to the similar outer dimensions of the spiral centralizer to the drill bit and the shallow flow channel and difficult chip removal of the centralizer, it is not conducive to dealing with blocky downhole complex objects and is extremely likely to cause sticking of the drill.

[0005] (2) Using a screw without a centralizer can well solve the problems faced by the spiral centralizer when drilling through complex formations. However, because the screw without a centralizer itself has no centralizer, when drilling in a coal seam, due to the softness of the coal seam, the build-up rate of the screw is low and the azimuth drift is irregular, which cannot meet the requirements of the build-up rate of the horizontal section of the coalbed methane.

[0006] Therefore, it is necessary for the inventor to design an asymmetric three-lobe arc rib wing screw centralizer to overcome the above problems. Summary of the Utility Model

[0007] The main object of the present application is to provide an asymmetric three-lobe arc rib wing screw centralizer to solve the problems in the related art.

[0008] To achieve the above object, the present application provides an asymmetric three-lobe arc rib wing screw centralizer.

[0009] An asymmetric three-lobe arc rib wing screw centralizer according to the present application includes a centralizer screw body, both ends of the centralizer screw body are provided with joints, a first arc rib wing is fixedly arranged on the outer circumference of the middle part of the centralizer screw body, and the left and right sides of the centralizer screw body relative to the first arc rib wing are respectively fixedly provided with a second arc rib wing and a third arc rib wing between 90° and 120°, and the axes of the first arc rib wing, the second arc rib wing, and the third arc rib wing all coincide with the axis of the centralizer screw body.

[0010] Preferably, the straight width of the outer arc surface of the first arc rib wing is 121 mm, the radial dimension of the cross section is 36 mm, both ends of the first arc rib wing are arc-shaped, and first reaming teeth are fixedly laid on the outer surface, and the cross section of the first arc rib wing is fan-shaped.

[0011] Preferably, the straight widths of the outer arc surfaces of the second arc rib wing and the third arc rib wing are both 60 mm, the radial dimensions of the cross sections are both 36 mm, both ends of the second arc rib wing and the third arc rib wing are arc-shaped, and second reaming teeth are fixedly laid on the outer surface, and the cross section of the second arc rib wing is fan-shaped.

[0012] Preferably, the circumferential surfaces of the first arc rib wing, the second arc rib wing, and the third arc rib wing all have a plurality of outwardly protruding diameter-preserving teeth, and the plurality of outwardly protruding diameter-preserving teeth are divided into multiple columns and are all distributed along the axial direction of the centralizer screw body.

[0013] Preferably, the joint is cylindrical, and the diameter dimension of the cross section of the joint is smaller than the diameter dimension of the cross section of the centralizer screw body.

[0014] An asymmetric three-lobe arc rib wing screw centralizer provided by the present utility model, compared with the prior art, has the following beneficial effects:

[0015] 1. By setting the first arc rib wing, the second arc rib wing, and the third arc rib wing, and adopting a non-symmetric layout structure with different sizes, the asymmetric three-lobe arc rib wing screw centralizer solves or alleviates the problems of wellbore instability, collapse during the drilling process in the coal seam section due to complex geology, resulting in difficult tripping, difficult circulation, and easy occurrence of stuck pipe accidents.

[0016] 2. By optimizing the number, shape, layout, and thickness of the rib wings, the present utility model solves the above problems while meeting the requirements of the fixed guiding build-up rate. By developing a new form of screw centralizer, it effectively solves the problem that during the drilling construction process in complex coal seam sections, both safe drilling and safe tripping can be achieved, and at the same time, the build-up rate of the screw can meet the directional requirements. Thus, the purpose of shortening the drilling cycle and reducing the drilling cost is realized. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] The drawings forming a part of this application are used to provide a further understanding of this application, making other features, objectives, and advantages of this application more obvious. The schematic embodiments and descriptions of the drawings of this application are used to explain this application and do not constitute an improper limitation of this application. In the drawings:

[0018] Figure 1 is a three-dimensional structural schematic diagram of the present utility model;

[0019] Figure 2 is a side view of the present utility model;

[0020] Figure 3 is a top view of the present utility model;

[0021] Figure 4 is a cross-sectional view of the present utility model.

[0022] Wherein: 1. Centralizer screw body; 2. Sub-joint; 3. First arc rib wing; 31. First reaming tooth; 4. Second arc rib wing; 5. Third arc rib wing; 6. Second reaming tooth; 7. Outer protruding diameter protection tooth. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0023] In order to enable those skilled in the art of this technology to better understand the solution of this application, the technical solutions in the embodiments of this application will be clearly and completely described below in conjunction with the drawings in the embodiments of this application. Obviously, the described embodiments are only a part of the embodiments of this application, rather than all of the embodiments. Based on the embodiments in this application, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the scope of protection of this application.

[0024] It should be noted that in the description, claims and the above-mentioned drawings of this application, the terms "first", "second", etc. are used to distinguish similar objects, and do not necessarily describe a specific order or sequence. It should be understood that the data used in this way can be interchanged under appropriate circumstances, so as to implement the embodiments of this application described herein. In addition, the terms "comprising" and "having" and any variations thereof are intended to cover non-exclusive inclusion. For example, a process, method, system, product or device that includes a series of steps or units does not necessarily have to be limited to those steps or units clearly listed, but may include other steps or units not clearly listed or inherent to these processes, methods, products or devices.

[0025] In this application, the orientation or positional relationship indicated by the terms "upper", "lower", "left", "right", "front", "rear", "top", "bottom", "inner", "outer", "middle", "vertical", "horizontal", "lateral", "longitudinal", etc. is based on the orientation or positional relationship shown in the drawings. These terms are mainly used to better describe this application and its embodiments, and are not used to limit that the indicated devices, elements or components must have a specific orientation, or be constructed and operated in a specific orientation.

[0026] Moreover, in addition to being used to represent the orientation or positional relationship, some of the above terms may also be used to represent other meanings. For example, the term "upper" may also be used to represent a certain attachment relationship or connection relationship in some cases. For those of ordinary skill in the art, the specific meanings of these terms in this application can be understood according to specific circumstances.

[0027] In addition, the meaning of the term "plurality" should be two or more.

[0028] It should be noted that, without conflict, the embodiments and features in the embodiments of this application can be combined with each other. The following will refer to the drawings and describe this application in detail in combination with the embodiments.

[0029] Embodiment 1:

[0030] Such as Figures 1 to 4As shown in the figure; an asymmetric three-lobe arc-shaped rib wing screw centralizer, including a centralizer screw body 1, both ends of the centralizer screw body 1 are provided with joints 2. During use, by connecting with external devices through the joints 2, the centralizer can be connected with a variety of external devices. A first arc-shaped rib wing 3 is fixedly arranged on the outer circumference of the middle part of the centralizer screw body 1. During use, the first arc-shaped rib wing 3 is fixedly arranged at the screw bending point. On the outer circumference of the middle part of the centralizer screw body 1, a second arc-shaped rib wing 4 and a third arc-shaped rib wing 5 are respectively fixedly arranged between 90° and 120° on the left and right sides of the first arc-shaped rib wing 3. During use, by setting three rib wings with an asymmetric layout, the tool face is stabilized, and the requirements for the directional build-up rate in the coal seam section can be better met. The axes of the first arc-shaped rib wing 3, the second arc-shaped rib wing 4, and the third arc-shaped rib wing 5 all coincide with the axis of the centralizer screw body 1. When encountering downhole complexities during use, coal seam chunks can more easily pass through the flow channels between the first arc-shaped rib wing 3, the second arc-shaped rib wing 4, and the third arc-shaped rib wing 5 on the centralizer, preventing the formation of coal chip accumulation points at the centralizer, causing the pump pressure to rise sharply until circulation is impossible. At the same time, the number, shape, layout, and thickness of the rib wings are optimized to make it meet the requirements of improving the chip removal flow area while also meeting the requirements of directional inclination, and it can adapt to the requirements of guiding in the horizontal section of the coal seam.

[0031] Furthermore, the straight width of the outer arc surface of the first arc-shaped rib wing 3 is 121 mm, and the radial dimension of the cross-section is 36 mm. Both ends of the first arc-shaped rib wing 3 are arc-shaped, and the outer surfaces are fixedly provided with first reaming teeth 31. During use, by making both ends of the first arc-shaped rib wing 3 arc-shaped, this structural design enables minerals to move along the arc surface during drilling and grinding, resulting in less friction during the drilling and grinding process, and can relieve the drag phenomenon caused by the screw centralizer. By fixedly arranging the first reaming teeth 31 on the outer surfaces of both ends of the first arc-shaped rib wing 3, the reaming efficiency is higher, and it is easier to pass through the coal chip accumulation section during back reaming. The cross-section of the first arc-shaped rib wing 3 is fan-shaped. By setting it as a fan shape, the connection between the first arc-shaped rib wing 3 and the outer side surface of the centralizer screw body 1 is more stable during use, thus ensuring the stability of the overall structure of the asymmetric three-lobe arc-shaped rib wing screw centralizer during use.

[0032] Furthermore, the linear widths of the outer arc surfaces of the second arc-shaped rib wing 4 and the third arc-shaped rib wing 5 are both 60 mm, and the radial dimensions of the cross-sections are both 36 mm. Both ends of the second arc-shaped rib wing 4 and the third arc-shaped rib wing 5 are arc-shaped, and the second scribing teeth 6 are fixedly laid on the outer surfaces. During use, the drilling process has a higher efficiency when drilling and scribing, and it is easier to pass through the coal chip accumulation section during back-reaming, reducing the project time and saving the project cost. The cross-section of the second arc-shaped rib wing 4 is fan-shaped. By setting it as a fan shape, the connection between the second arc-shaped rib wing 4 and the outer side surface of the centralizer screw body 1 is more stable during use, thus ensuring the stability of the overall structure of the asymmetric three-lobe arc-shaped rib wing centralizer. When encountering coal seam collapse or coal seam instability during drilling, circulation can still be established, and the operation efficiency can be effectively improved during back-reaming.

[0033] Furthermore, the circumferential surfaces of the first arc-shaped rib wing 3, the second arc-shaped rib wing 4, and the third arc-shaped rib wing 5 all have a plurality of outwardly protruding diameter-preserving teeth 7, which makes the drilling process have a higher drilling and grinding efficiency during use. The plurality of outwardly protruding diameter-preserving teeth 7 are divided into multiple columns and are all distributed along the axial direction of the centralizer screw body 1, which makes the drilling process have a higher efficiency when drilling and scribing, reducing the project time and saving the project cost.

[0034] Furthermore, the joint 2 is cylindrical, and the diameter dimension of the cross-section of the joint 2 is smaller than the diameter dimension of the cross-section of the centralizer screw body 1. During use, the centralizer screw body 1 can be fixedly connected to an external device, thus facilitating use.

[0035] The above are only the preferred embodiments of the present application and are not used to limit the present application. For those skilled in the art, various changes and modifications can be made to the present application. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application shall be included within the protection scope of the present application.

Claims

1. An asymmetric three-lobe arc rib wing screw centralizer, comprising a centralizer screw body (1), characterized in that: Both ends of the centralizer screw body (1) are provided with connectors (2). A first arc-shaped rib wing (3) is fixedly arranged on the outer periphery of the middle part of the centralizer screw body (1). Second and third arc-shaped rib wings (4) and (5) are respectively fixedly arranged on the left and right sides of the first arc-shaped rib wing (3) on the outer periphery of the middle part of the centralizer screw body (1) at an angle between 90° and 120°. The axes of the first arc-shaped rib wing (3), the second arc-shaped rib wing (4), and the third arc-shaped rib wing (5) all coincide with the axis of the centralizer screw body (1).

2. The asymmetric three-lobe arc-shaped rib wing screw centralizer according to claim 1, characterized in that: The straight width of the outer arc surface of the first arc-shaped rib wing (3) is 121 mm, and the radial dimension of the cross-section is 36 mm. Both ends of the first arc-shaped rib wing (3) are arc-shaped, and first reaming teeth (31) are fixedly arranged on the outer surfaces. The cross-section of the first arc-shaped rib wing (3) is fan-shaped.

3. The asymmetric three-lobe arc-shaped rib wing screw centralizer according to claim 1, characterized in that: The straight widths of the outer arc surfaces of the second arc-shaped rib wing (4) and the third arc-shaped rib wing (5) are both 60 mm, and the radial dimensions of the cross-sections are both 36 mm. Both ends of the second arc-shaped rib wing (4) and the third arc-shaped rib wing (5) are arc-shaped, and second reaming teeth (6) are fixedly arranged on the outer surfaces. The cross-section of the second arc-shaped rib wing (4) is fan-shaped.

4. The asymmetric three-lobe arc-shaped rib wing screw centralizer according to claim 1, characterized in that: The circumferential surfaces of the first arc-shaped rib wing (3), the second arc-shaped rib wing (4), and the third arc-shaped rib wing (5) all have a plurality of outwardly protruding diameter-preserving teeth (7). The plurality of outwardly protruding diameter-preserving teeth (7) are divided into multiple columns and are all distributed along the axial direction of the centralizer screw body (1).

5. The asymmetric three-lobe arc-shaped rib wing screw centralizer according to claim 1, wherein: The connector (2) is cylindrical, and the diameter dimension of the cross-section of the connector (2) is smaller than the diameter dimension of the cross-section of the centralizer screw body (1).

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