Backup plate for intelligent rotary guiding system

Abstract

The utility model discloses a backup plate for an intelligent rotary guide system, which comprises a backup plate body, a plurality of rows of PDC (Polycrystalline Diamond Compact) teeth are arranged on the backup plate body, at least two rows of PDC teeth positioned at the left end of the acting surface of the backup plate body are of rectangular structures with fillets, and the rest rows of PDC teeth are of large circular structures; or the right end of the acting surface of the backup plate body is at least provided with a row of PDC teeth of a small circular structure, the unit area of the PDC teeth is 0.8-1.2 times smaller than that of the PDC teeth of the large circular structure, and the rest rows of PDC teeth are of the large circular structure or a row of PDC teeth of the large circular structure and a row of PDC teeth of the small circular structure are alternately arranged. According to the backup plate for the intelligent rotary steering system, the abrasion resistance and the erosion resistance of the whole hard surface layer can be improved, and therefore the overall service life of an intelligent rotary steering tool is prolonged.

Description

Technical Field

[0001] The utility model relates to the technical field of oil and gas drilling equipment, in particular to a push plate for an intelligent rotary guide system. Background Art

[0002] The push plate is the core component of the push-bias mechanism used in the intelligent rotary steering system. The push plate is generally located outside the drill pipe and adjacent to the LWD, MWD, TC bearing, PDC bearing, etc. The hydraulic system is used to push the push plate to open and close to achieve the steering of the drill bit. The push plate contacts the well wall during operation, and it is required to have high wear resistance and erosion resistance. The base material of the existing push plate is ordinary steel, and its wear resistance is far from meeting the requirements of the harsh underground environment.

[0003] In order to improve the wear resistance, corrosion resistance and impact resistance of the working surface of the push-back plate product, the existing technology generally adopts a method of combining welding polycrystalline diamond with surfacing hard surface layer to improve the wear resistance and corrosion resistance of the surface of the push-back plate substrate. There are two forms of polycrystalline diamond: thermally stable diamond TSP (all polycrystalline diamond) and PDC (polycrystalline diamond composite sheet: the upper layer is polycrystalline diamond, the lower layer is cemented carbide, and the two materials are combined into a composite sheet as a whole). According to the operating conditions of the push-back plate, during the opening and closing process underground, the part that first contacts the well wall to bear wear and resist impact is faced with extremely severe wear and scouring. No matter which of the above solutions is adopted, its final failure is caused by the falling off of the hard surface layer that first bears the key wear working surface or the falling off of the TSP block as a whole and not being wear-resistant. Generally speaking, the TSP polycrystalline diamond + hard surface cladding method improves the wear resistance and corrosion resistance of the parent material surface by spot welding the TSP diamond block first and then cladding a layer of hard surface layer. In addition to the shedding of the hard surface layer on the key functional surface, the spot welded TSP block will also fall off as a whole due to the poor bonding strength between the spot welded TSP block and the parent material, causing failure. Another common improvement scheme is to first clad the hard surface layer and then braze the PDC polycrystalline diamond. Although this method has better failure performance than the spot welding TSP method, and has better bonding strength with the parent material, and the PDC teeth will not fall off, it will still fail due to the poor wear resistance of the hard surface layer on the key functional surface, resulting in large-scale block shedding. Moreover, the existing solution of combining a surfacing hard surface layer with a brazed PDC tooth uses a conventional circular structure PDC tooth, which can replace the hard surface layer to bear the push plate. The wear resistance and coverage area are limited in underground operations. Therefore, under the condition that the wear resistance of the hard surface layer is also limited, it will still lead to poor erosion resistance and wear performance of the product, and it will be washed out by the underground high-speed drilling fluid and underground high-speed medium to form grooves and slots, resulting in failure. The final result of the above two solutions is a low product life and severe surface erosion, which leads to frequent replacement and high maintenance costs. Therefore, how to extend the service life of the push plate, reduce the frequency of shutdowns and replacements, improve the overall reliability and efficiency of drilling tools, and reduce the frequency of shutdowns and replacements during drilling operations and the carbon emissions of the operation links are technical problems that need to be urgently solved by technical personnel in this field. Utility Model Content

[0004] In order to solve the above technical problems, the utility model provides a push plate for an intelligent rotary guide system, which can improve the wear resistance and erosion resistance of the entire hard surface layer, thereby increasing the overall service life of the intelligent rotary guide tool.

[0005] The technical solution provided by the utility model is as follows:

[0006] A push plate for an intelligent rotary guide system comprises a push plate body, wherein the push plate body is provided with a plurality of rows of PDC teeth, wherein at least two rows of PDC teeth located at the left end of an action surface of the push plate body are rectangular structures with rounded corners, and the remaining rows of PDC teeth are large circular structures; or at least one row of PDC teeth with a small circular structure whose unit area is 0.8 to 1.2 times smaller than that of the PDC teeth with a large circular structure is provided at the right end of the action surface of the push plate body, and the remaining rows of PDC teeth are large circular structures, or a row of PDC teeth with a large circular structure and a row of PDC teeth with a small circular structure are alternately arranged.

[0007] Preferably, the distance between the PDC teeth with rounded rectangular structures in the leftmost row or the PDC teeth with large circular structures in the leftmost row and the edge of the left side action surface of the push plate body is H, 3mm≤H≤10mm.

[0008] Preferably, the straight-line distance between two adjacent PDC teeth of the rectangular structure with rounded corners is h, and 2.5 mm≤h≤13 mm.

[0009] Preferably, the straight-line distance between two adjacent PDC teeth of the large circular structure is h', and 5mm≤h'≤8mm.

[0010] Preferably, in two adjacent rows of the PDC teeth with small circular structures and the PDC teeth with large circular structures, the PDC teeth with small circular structures and the PDC teeth with large circular structures are staggered.

[0011] Preferably, the diameter of the PDC teeth with large circular structures is 11-15 mm, and the diameter of the PDC teeth with small circular structures is 6-12 mm.

[0012] Preferably, the rectangular PDC tooth with rounded corners is a rectangular structure.

[0013] Preferably, the length of the rectangular PDC tooth with rounded corners is 13-17 mm, and the width of the rectangular PDC tooth with rounded corners is 8-12 mm.

[0014] The utility model has the following advantages over the prior art:

[0015] The intelligent rotary guide system of the utility model uses a push plate to reduce the occupied area of ​​the overall hard surface layer of the push plate by changing the shape of the two leftmost rows of PDC teeth on the active surface of the push plate body or changing the shape of the rightmost row of PDC teeth (for the same push plate, the more PDC teeth on the surface replace the original steel matrix, the naturally improves the wear resistance of the surface). Compared with the prior art, this layout design can improve the wear resistance of the push plate to a certain extent, and move the position of the PDC teeth on the left side relative to the position of the PDC teeth in the prior art toward the left active surface by a certain distance (the moving distance is 10 to 15 mm), closer to the left end edge of the push plate, so that the more wear-resistant PDC teeth are involved in the working state of resisting wear and erosion in advance, replacing the steel surface with poor wear resistance to resist wear, thereby improving the overall wear resistance and service life. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments recorded in the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0017] Figure 1 This is a schematic diagram of the structure of a push plate for an intelligent rotary guide system in Example 1 of the utility model;

[0018] Figure 2 This is a schematic structural diagram of a push plate for an intelligent rotary guide system in Example 2 of the utility model.

[0019] Reference numerals:

[0020] 1. Push plate body; 2. PDC teeth with rounded rectangular structure; 3. PDC teeth with large circular structure; 4. PDC teeth with small circular structure. DETAILED DESCRIPTION

[0021] In order to enable those skilled in the art to better understand the technical solutions in the utility model, the technical solutions in the embodiments of the utility model are described clearly and completely below. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of them. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in the field without creative work are within the scope of protection of the utility model.

[0022] Example 1

[0023] like Figure 1As shown, an embodiment of the utility model provides a push plate for an intelligent rotary guide system, including a push plate body 1, on which a plurality of rows of PDC teeth are arranged. At least two rows of PDC teeth located at the left end of the active surface of the push plate body 1 are rectangular structures with rounded corners, and the remaining rows of PDC teeth are large circular structures.

[0024] In the present embodiment, the distance between the leftmost row of PDC teeth 2 with rounded rectangular structures or the leftmost row of PDC teeth 3 with large circular structures and the edge of the left working surface of the push plate body 1 is H, 5mm≤H≤8mm, so that the more wear-resistant PDC teeth can intervene in advance to resist wear and erosion, thereby improving the overall wear resistance and service life. By adopting the design scheme of the present embodiment, under the same conditions, the service life of the push plate body 1 can be increased by more than 40%.

[0025] In this embodiment, the straight-line distance between two adjacent PDC teeth 2 with rounded rectangular structures is h, and 3 mm ≤ h ≤ 10 mm.

[0026] In this embodiment, the straight-line distance between two adjacent large circular PDC teeth 3 is h', and 2.5 mm ≤ h' ≤ 13 mm.

[0027] The above distance setting is to ensure that the thermal impact on the substrate during the tooth welding process is minimized, and the weld layer on the surface of the substrate will not cause cracking and failure due to the concentrated thermal impact caused by repeated heating; at the same time, while ensuring that there is no cracking, it can also increase the maximum area of ​​the PDC tooth covering the push plate substrate, thereby ensuring the overall wear resistance and life.

[0028] In this embodiment, the diameter of the PDC tooth 3 of the large circular structure is 11-15 mm. The rectangular structure PDC tooth 2 with rounded corners is a rectangular structure, which increases the area ratio of the PDC tooth on the surface of the push plate body 1, and relatively reduces the area ratio of the hard surface layer outside the PDC tooth, making the surface of the parent material matrix more wear-resistant. The length of the rectangular structure PDC tooth 2 with rounded corners is 13-17 mm, and the width of the rectangular structure PDC tooth 2 with rounded corners is 8-12 mm.

[0029] Example 2

[0030] like Figure 2As shown, the difference between this embodiment and embodiment 1 is that at least one row of PDC teeth 4 of small circular structure whose unit area is 0.8 to 1.2 times smaller than that of PDC teeth 3 of large circular structure is provided at the right end of the action surface of the push plate body 1, and the remaining rows of PDC teeth are large circular structure 3 or one row of PDC teeth 3 of large circular structure and one row of PDC teeth 4 of small circular structure are arranged alternately. Such tooth arrangement design can also reduce the occupied area of ​​the overall hard surface layer of the push plate. Compared with the prior art, this arrangement design can also improve the wear resistance of the push plate to a certain extent. The diameter of PDC teeth 4 of small circular structure is 6 to 12 mm, and the PDC teeth 4 of small circular structure and PDC teeth 3 of large circular structure in two adjacent rows are arranged in an offset manner.

[0031] The above description of the disclosed embodiments enables those skilled in the art to implement or use the present invention. Various modifications to these embodiments will be apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention will not be limited to the embodiments shown herein, but will conform to the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A push plate for an intelligent rotary guide system, comprising a push plate body, on which a plurality of rows of PDC teeth are arranged, characterized in that: At least two rows of PDC teeth located on the left end of the working surface of the push plate body are rectangular structures with rounded corners, and the remaining rows of PDC teeth are large circular structures; or at least one row of PDC teeth with small circular structures whose unit area is 0.8 to 1.2 times smaller than that of PDC teeth with large circular structures is provided on the right end of the working surface of the push plate body, and the remaining rows of PDC teeth are large circular structures, or a row of PDC teeth with large circular structures and a row of PDC teeth with small circular structures are alternately arranged.

2. The push plate for the intelligent rotary guide system according to claim 1 is characterized in that: The distance between the PDC teeth with rounded rectangular structure in the leftmost row or the PDC teeth with large circular structure in the leftmost row and the edge of the left side action surface of the push plate body is H, 3mm≤H≤10mm.

3. The push plate for the intelligent rotary guide system according to claim 1, characterized in that: The straight-line distance between two adjacent PDC teeth of the rectangular structure with rounded corners is h, and 2.5 mm≤h≤13 mm.

4. The push plate for the intelligent rotary guide system according to claim 1, characterized in that: The straight-line distance between two adjacent PDC teeth of the large circular structure is h', 5mm≤h'≤8mm.

5. The push plate for the intelligent rotary guide system according to claim 1, characterized in that: The PDC teeth of the small circular structure and the PDC teeth of the large circular structure in the two adjacent rows are staggered.

6. The push plate for the intelligent rotary guide system according to any one of claims 1 to 5, characterized in that: The diameter of the PDC teeth of the large circular structure is 11-15 mm, and the diameter of the PDC teeth of the small circular structure is 6-12 mm.

7. The push plate for the intelligent rotary guide system according to any one of claims 1 to 5, characterized in that: The rectangular PDC tooth with rounded corners is a rectangular structure.

8. The push plate for the intelligent rotary guide system according to claim 7, characterized in that: The length of the rectangular PDC tooth with rounded corners is 13-17 mm, and the width of the rectangular PDC tooth with rounded corners is 8-12 mm.

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