Centralizer for petroleum drilling

Abstract

The utility model relates to the technical field of petroleum drilling, in particular to a centralizer for petroleum drilling. Comprising a centralizer body and an auxiliary device, the centralizer body is provided with a first connecting part and a second connecting part, the auxiliary device comprises six centralizing edges, rolling balls and wall scraping knives, the centralizing edges are annularly welded to the outer side of the centralizer body and are spaced by 60 degrees, the rolling balls are arranged on the upper sides of the centralizing edges, and the wall scraping knives are welded to the lower sides of the centralizing edges. During use, surface sliding friction between the centralizer body and the well wall can be converted into point rolling friction by arranging the rolling balls, the friction strength is reduced, abrasion is reduced, meanwhile, the wall scraping knife is arranged, the well wall can be scraped and trimmed, and the well wall can be scraped and trimmed by the wall scraping knife. And the rolling ball is further in rolling fit with the well wall, so that the abrasion between the centralizer body and the well wall can be reduced during use, the service life during well drilling is prolonged, and the use cost is reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of oil drilling, in particular to a centralizer for oil drilling. Background Art

[0002] A centralizer, also known as a stabilizer, is a tool that can ensure the quality of well cementing in drilling. It is a tool for stabilizing downhole drill strings and preventing deviation. It is connected to the drill pipe string and is a device used to stabilize the drilling direction. It is an important tool for preventing well deviation changes in oil, natural gas, and geological exploration drilling projects.

[0003] The prior art CN217999510U discloses a centralizer for oil drilling, which includes a lower shaft body. One end of the lower shaft body is fixedly connected with a connecting screw pipe. The inner wall of the connecting screw pipe is threadedly connected with an upper shaft body. Chucks are fixedly connected to both the lower shaft body and the upper shaft body. Through the cooperation of the lower shaft body, the connecting screw pipe, the upper shaft body, the chuck, the rotating groove, and the supporting member, after the lower shaft body and the upper shaft body are respectively connected to the drill pipe string and inserted into the well, the supporting member abuts against the well wall and will no longer rotate. When the drill pipe string rotates, it drives the lower shaft body and the upper shaft body to rotate. The supporting member straightens the drill pipe string by positioning the lower shaft body and the upper shaft body, reducing the sliding friction and wear between the supporting member and the well wall.

[0004] However, in actual use of the above centralizer for oil drilling, when using the supporting member to slide against the well wall, after long-term operation, it will cause great wear on the outer wall of the centralizer, reducing its service life, and even seriously affecting the drilling work in severe cases. Summary of the Utility Model

[0005] The purpose of the utility model is to provide a centralizer for oil drilling, which can reduce the wear between the centralizer body and the well wall during use, improve the service life during drilling, and reduce the use cost.

[0006] To achieve the above purpose, the utility model provides a centralizer for oil drilling, which includes a centralizer body. The centralizer body has a first connection part and a second connection part. The first connection part is located on the upper side of the centralizer body, and the second connection part is located on the lower side of the centralizer body. It also includes an auxiliary device;

[0007] The auxiliary device includes a centralizing edge, rolling balls, and scraping knives. The centralizing edges are annularly welded on the outer side of the centralizer body, with a quantity of six pieces, spaced 60° from each other. The rolling balls are arranged on the upper side of the centralizing edges, and the scraping knives are welded on the lower side of the centralizing edges;

[0008] Discharge grooves are formed between the centralizing edges.

[0009] Among them, the straightening edge is of a shuttle-like structure, and a cemented carbide material is brazed on its surface by using the P IA plasma spray welding technology.

[0010] Among them, the rolling ball is made of a cemented carbide material, and the rolling ball is 5 mm higher than the end face of the straightening edge.

[0011] Among them, the cutting edge part of the scraping knife is 5 mm higher than the end face of the straightening edge.

[0012] Among them, a clamping groove is provided on the first connecting part, and the clamping grooves are arranged in an annular array on the outer side of the first connecting part, with an interval of 60° between each other.

[0013] A centralizer for oil drilling of the present utility model, the centralizer body has a first connecting part and a second connecting part, which is convenient for connection and setting. The straightening edges are annularly welded on the outer side of the centralizer body, and the number is six, with an interval of 60° between each other. The rolling balls are arranged on the upper side of the straightening edges, and the scraping knives are welded on the lower side of the straightening edges. The straightening edges form discharge grooves with each other, which is beneficial to the discharge of mud and water. During use, by arranging the rolling balls, the surface sliding friction between the centralizer body and the well wall can be changed into point rolling friction, reducing the friction force and wear. At the same time, by arranging the scraping knives, the well wall can be scraped and trimmed, which will further facilitate the rolling cooperation between the rolling balls and the well wall. Furthermore, it can reduce the wear between the centralizer body and the well wall during use, improve the service life during drilling, and reduce the use cost. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the following will briefly introduce the drawings required for the description of the embodiments or the prior art.

[0015] Figure 1 It is a schematic diagram of the overall structure of the centralizer for oil drilling in the first embodiment of the present utility model.

[0016] Figure 2 It is the front view of the centralizer for oil drilling in the first embodiment of the present utility model.

[0017] Figure 3 It is a schematic diagram of the overall structure of the centralizer for oil drilling in the second embodiment of the present utility model.

[0018] In the figure: 101 - centralizer body, 1011 - first connecting part, 1012 - second connecting part, 102 - straightening edge, 103 - rolling ball, 104 - scraping knife, 105 - discharge groove. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0019] Embodiments of the present utility model will be described in detail below. Examples of the embodiments are shown in the accompanying drawings. The embodiments described below with reference to the accompanying drawings are exemplary and are intended to explain the present utility model, and should not be construed as a limitation to the present utility model.

[0020] Embodiment 1:

[0021] As Figure 1 and Figure 2 shown, where Figure 1 is a schematic diagram of the overall structure of a centralizer for oil drilling, Figure 2 is the front view of the centralizer for oil drilling. The present utility model provides a centralizer for oil drilling, which includes a centralizer body 101 and an auxiliary device. The centralizer body 101 has a first connection portion 1011 and a second connection portion 1012. The auxiliary device includes a centralizing edge 102, rolling balls 103, and scraping blades 104. Discharge grooves 105 are formed between the centralizing edges 102. Through the foregoing solution, the wear between the centralizer body 101 and the wellbore can be reduced during use, the service life during drilling can be improved, and the use cost can be reduced. It can be understood that the foregoing solution can improve the service life of the centralizer body 101 during drilling and reduce the use cost.

[0022] In this embodiment, the centralizer body 101 has a first connection portion 1011 and a second connection portion 1012. The first connection portion 1011 is located on the upper side of the centralizer body 101, and the second connection portion 1012 is located on the lower side of the centralizer body 101. During connection and installation, the centralizer body 101 is arranged in the middle of the drilling string through the first connection portion 1011 and the second connection portion 1012.

[0023] Among them, the centralizing edges 102 are annularly welded on the outer side of the centralizer body 101, and the number is six, with an interval of 60° between each other. The rolling balls 103 are arranged on the upper side of the centralizing edges 102, and the scraping blades 104 are welded on the lower side of the centralizing edges 102; the centralizing edges 102 are annularly welded on the outer side of the centralizer body 101, and six are arranged during setting, with an interval of 60° between each two. The centralizing edges 102 are used for centralizing and guiding. The rolling balls 103 are arranged at intervals in the mounting holes above the centralizing edges 102, and the scraping blades 104 are welded on the lower side of the centralizing edges 102.

[0024] Discharge grooves 105 are formed between the centralizing edges 102. After the centralizing edges 102 are arranged, the discharge grooves 105 are formed in the middle between each two, which facilitates the discharge of mud and water.

[0025] Secondly, the aligning edge 102 has a shuttle-like structure, and a cemented carbide material is brazed on its surface by using the PIA plasma spray welding technology. The aligning edge 102 having a shuttle-like structure can reduce the resistance generated by mud impurities to the aligning edge 102 during movement. The surface of the aligning edge 102 is brazed with a cemented carbide material by using the PIA plasma spray welding technology. The plasma spraying technology uses a DC-driven plasma arc as a heat source to heat materials such as ceramics, alloys, and metals to a molten or semi-molten state and spray them at a high speed onto the surface of a pre-treated workpiece to form a firmly adhered surface layer. Cemented carbide has a series of excellent properties such as high hardness, wear resistance, good strength and toughness, heat resistance, and corrosion resistance. Especially its high hardness and wear resistance remain basically unchanged even at a temperature of 500°C and still have a very high hardness at 1000°C. Therefore, by brazing a cemented carbide material on the surface of the aligning edge 102 using the PIA plasma spray welding technology, the hardness, strength, and wear resistance of the aligning edge 102 can be improved, which is beneficial to extending its service life.

[0026] Then, the rolling ball 103 is made of a cemented carbide material, and the rolling ball 103 is 5 mm higher than the end face of the aligning edge 102. The rolling ball 103 is made of a cemented carbide material. Since cemented carbide has a series of excellent properties such as high hardness, wear resistance, good strength and toughness, heat resistance, and corrosion resistance. Especially its high hardness and wear resistance remain basically unchanged even at a temperature of 500°C and still have a very high hardness at 1000°C. Therefore, the hardness, strength, and wear resistance of the rolling ball 103 can be improved, which is beneficial to extending its service life. The rolling ball 103 is 5 mm higher than the end face of the aligning edge 102. This structure enables the wellbore wall to directly make multi-point rolling contact with the rolling ball 103, which is beneficial to reducing the frictional force between the centralizer body 101 and the wellbore wall.

[0027] Finally, the cutting edge part of the scraping blade 104 is 5 mm higher than the end face of the aligning edge. The cutting edge part of the scraping blade 104 is 5 mm higher than the end face of the aligning edge 102. This spacing is the same as the spacing of the rolling ball 103 higher than the aligning edge 102. Therefore, during use, the wellbore wall can be rotationally trimmed by the scraping blade 104, which is beneficial to achieving good rolling contact between the wellbore wall and the rolling ball 103.

[0028] When using the present utility model, it can reduce the wear between the centralizer body 101 and the wellbore during use, improve the service life during drilling, and reduce the use cost. During use, first, the centralizer body 101 is arranged in the middle of the drilling string through the first connecting portion 1011 and the second connecting portion 1012. Then, by directly arranging a plurality of the rolling balls 103, the surface sliding friction between the centralizer body 101 and the wellbore can be transformed into point rolling friction, which is beneficial to reducing the friction force and wear. At the same time, by arranging the scraping blade 104, the wellbore can be scraped and trimmed, which will further facilitate the rolling cooperation between the rolling balls 103 and the wellbore, and further realize reducing the wear between the centralizer body 101 and the wellbore during use, improving the service life during drilling, and reducing the use cost.

[0029] Embodiment 2:

[0030] As Figure 3 shown, wherein Figure 3 is a schematic diagram of the overall structure of a centralizer for oil drilling. On the basis of the first embodiment, the present utility model provides a centralizer for oil drilling. A clamping groove 201 is arranged on the first connecting portion 1011. The clamping grooves 201 are arranged in an annular array on the outer side of the first connecting portion 1011, with an interval of 60° between each other. When the clamping grooves 201 are arranged, they do not penetrate the first connecting portion 1011 and are arranged in an annular array on the first connecting portion 1011.

[0031] In this embodiment, when the first connecting portion 1011 is installed, if the clamping groove 201 is not arranged, at this time, the first connecting portion 1011 will be clamped and rotated by a pipe wrench. By arranging the clamping groove 201, when the first connecting portion 1011 is connected to the pipe string, it can be directly clamped and rotated by a special hook wrench, increasing the operation method during installation and facilitating selective installation during use.

[0032] The above-disclosed are only one or more preferred embodiments of the present application, and the scope of rights of the present application cannot be limited thereby. Those of ordinary skill in the art can understand all or part of the processes of implementing the above embodiments, and the equivalent changes made according to the claims of the present application still fall within the scope covered by the present application.

Claims

1. A centralizer for oil drilling, comprising a centralizer body, the centralizer body having a first connection part and a second connection part, the first connection part being located on the upper side of the centralizer body, and the second connection part being located on the lower side of the centralizer body, characterized in that, it further comprises an auxiliary device; The auxiliary device includes a centralizing edge, rolling balls and scraping knives. The centralizing edges are welded annularly on the outer side of the centralizer body, with six pieces in number, spaced 60° from each other. The rolling balls are arranged on the upper side of the centralizing edges, and the scraping knives are welded on the lower side of the centralizing edges; Discharge grooves are formed between the centralizing edges; The cutting edge part of the scraping knife is 5 mm higher than the end face of the centralizing edge; A clamping groove is provided on the first connection part, and the clamping grooves are arranged in an annular array on the outer side of the first connection part, spaced 60° from each other.

2. The centralizer for oil drilling according to claim 1, characterized in that, The centralizing edge is of a shuttle-shaped structure, and a hard alloy material is brazed on its surface by PIA plasma spray welding technology.

3. The centralizer for oil drilling according to claim 1, characterized in that, The rolling balls are made of hard alloy material, and the rolling balls are 5 mm higher than the end face of the centralizing edge.

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