High-strength screw drill with efficient deflecting capacity

Abstract

The utility model provides a high-strength screw drill with efficient deflecting capacity, and belongs to the field of drilling equipment. A high-strength screw drill with efficient deflecting capacity comprises a hydraulic motor assembly, a universal shaft assembly and a transmission shaft assembly which are sequentially connected. The first shell section of the universal shaft assembly is connected with the second shell section of the transmission shaft assembly at an included angle; by arranging the protruding wear-resistant guide strips on the outer sides of the first shell section and the second shell section, continuous protection can be formed on the outer side of the connecting part, a certain guide effect can be achieved, and stability is improved; the front convex part of the wear-resistant guide strip is arranged in the front, and the front convex part with a higher convex degree can better crush and loosen rocks on the well wall through extrusion, so that the scraping of the rocks to the connecting part is reduced; meanwhile, other parts of the wear-resistant guide strip are lower, so that a protection effect can be achieved, and excessive resistance can be avoided; the front convex part is arranged at one end of the wear-resistant guide strip, and the wear-resistant guide strip can provide support for the front convex part, so that the front convex part is prevented from being broken.

Description

Technical Field

[0001] This application belongs to the field of drilling equipment technology, and more specifically, relates to a high-strength screw drill bit with efficient directional drilling capability. Background Technology

[0002] In oil drilling, screw drills with directional drilling capabilities are needed to change the drilling direction. These screw drills have a bend angle; after being lowered into the wellbore, the bend angle causes the drill bit to drill in one direction, turning the wellbore. However, during drilling, the outer side of the bend in the screw drill experiences greater pressure and is more prone to wear. To address this, a wear-resistant layer or wear-resistant protrusions are typically added to the bend to improve durability. However, in hard formations, the rock on the wellbore wall more easily scrapes the outer side of the bend, making the current method of adding wear-resistant layers or protrusions less effective in providing wear resistance. Utility Model Content

[0003] In view of this, the present application provides a high-strength screw drill bit with efficient directional drilling capability to solve the technical problem that the outer side of the bent part of the screw drill bit is easily worn in the prior art.

[0004] To achieve the above objectives, the technical solution adopted in this application is as follows:

[0005] On the one hand, a high-strength screw drill bit with efficient directional drilling capability is provided, comprising: a hydraulic motor assembly, a universal joint assembly and a drive shaft assembly connected in sequence;

[0006] The first housing section of the universal joint assembly is connected to the second housing section of the drive shaft assembly at an angle.

[0007] A wear-resistant guide strip is provided on the outer side of the connection between the first outer shell segment and the second outer shell segment. The wear-resistant guide strip is raised and extends from the outer side of the first outer shell segment to the outer side of the second outer shell segment.

[0008] The wear-resistant guide strip has a forward protrusion at one end on the second outer shell section, and the height of the forward protrusion is greater than the height of the rest of the wear-resistant guide strip.

[0009] In some embodiments, there are multiple wear-resistant guide strips, which are distributed circumferentially along the outer side of the connection between the first housing segment and the second housing segment, and each wear-resistant guide strip is provided with the forward protrusion.

[0010] In some embodiments, the surface of the connection portion between the first housing segment and the second housing segment is provided with wear-resistant protrusions located between adjacent wear-resistant guide strips.

[0011] In some embodiments, a mounting groove is provided on the outer side of the connection between the first housing segment and the second housing segment. The mounting groove extends from the outer side of the first housing segment to the outer side of the second housing segment. The wear-resistant guide strip is embedded in the mounting groove and welded in place.

[0012] In some embodiments, the front end of the protrusion is pointed and fits against the surface of the second housing segment.

[0013] In some embodiments, the height of the wear-resistant guide strip is 8 to 32 mm, the height of the forward protrusion is greater than 1.5 times the height of the wear-resistant guide strip, and the orthographic projection of the forward protrusion on the radial plane of the first housing segment does not exceed the outer contour of the first housing segment.

[0014] The beneficial effects of the high-strength screw drill with efficient directional drilling capability provided in this application embodiment are as follows: Compared with the prior art, the high-strength screw drill with efficient directional drilling capability in this application embodiment, by setting protruding wear-resistant guide strips on the outer side of the first outer shell section and the second outer shell section, can on the one hand form continuous protection on the outer side of the connecting part, and on the other hand play a certain guiding role, thereby improving stability.

[0015] As the drill string advances, the front convex part of the wear-resistant guide bar is in front. The more prominent front convex part can better crush and loosen the rock on the well wall through compression, reducing the scraping of the rock on the connection between the first and second outer shell sections. At the same time, the lower part of the wear-resistant guide bar can both provide protection and avoid excessive resistance.

[0016] In addition, the protruding part is located at one end of the wear-resistant guide strip, which can provide support for the protruding part, distribute the force on the protruding part, and prevent the protruding part from breaking. Attached Figure Description

[0017] To more clearly illustrate the technical solutions in the embodiments of this application, 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 application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0018] Figure 1 A perspective view of a screw drill bit in the prior art that is improved according to the embodiments of this application;

[0019] Figure 2 A cross-sectional view of the connection between the first and second outer shell sections of a high-strength screw drill bit with efficient directional drilling capability provided in an embodiment of this application;

[0020] Figure 3for Figure 2 A bottom view of the connection between the first and second outer shell sections;

[0021] Figure 4 for Figure 2 A schematic diagram of the cross-section of the wear-resistant guide strip.

[0022] The following are the labeling elements in the figure:

[0023] 1-Hydraulic motor assembly; 2-Universal shaft assembly; 21-First housing section; 3-Drive shaft assembly; 31-Second housing section; 4-Wear-resistant guide strip; 41-Front protrusion; 42-Front end of front protrusion; 43-Mounting groove; 44-Bevel; 5-Wear-resistant protrusion. Detailed Implementation

[0024] To make the technical problems, technical solutions, and beneficial effects to be solved by this application clearer, the following detailed description is provided in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative and are not intended to limit the scope of this application.

[0025] It should be noted that when a component is referred to as being "fixed to" or "set on" another component, it can be directly on or indirectly on that other component. When a component is referred to as being "connected to" another component, it can be directly connected to or indirectly connected to that other component.

[0026] It should be understood that the terms "length", "width", "upper", "lower", "front", "rear", "left", "right", "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. They are only for the convenience of describing this application 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 limitations on this application.

[0027] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this application, "multiple" or "several" means two or more, unless otherwise explicitly specified.

[0028] Please refer to the following: Figures 1 to 4 The high-strength screw drill bit with efficient directional drilling capability provided in the embodiments of this application will now be described. A high-strength screw drill bit with efficient directional drilling capability includes: a hydraulic motor assembly, a universal joint assembly, and a drive shaft assembly connected in sequence;

[0029] The first housing section of the universal joint assembly is connected at an angle to the second housing section of the drive shaft assembly;

[0030] A wear-resistant guide strip is provided on the outer side of the connection between the first outer shell section and the second outer shell section. The wear-resistant guide strip is raised and extends from the outer side of the first outer shell section to the outer side of the second outer shell section.

[0031] The wear-resistant guide strip has a forward protrusion at one end on the second housing section, and the height of the forward protrusion is greater than the height of the rest of the wear-resistant guide strip.

[0032] Compared with the prior art, the high-strength screw drill with efficient directional drilling capability in the embodiments of this application provides continuous protection for the outer side of the connecting part and also plays a certain guiding role, thereby improving stability by setting raised wear-resistant guide strips on the outer side of the first outer shell section and the second outer shell section.

[0033] As the drill string advances, the front convex part of the wear-resistant guide bar is in front. The more prominent front convex part can better crush and loosen the rock on the well wall through compression, reducing the scraping of the rock on the connection between the first and second outer shell sections. At the same time, the lower part of the wear-resistant guide bar can both provide protection and avoid excessive resistance.

[0034] In addition, the protruding part is located at one end of the wear-resistant guide strip, which can provide support for the protruding part, distribute the force on the protruding part, and prevent the protruding part from breaking.

[0035] In this embodiment, the first housing section of the universal joint assembly and the second housing section of the drive shaft assembly are connected at an obtuse angle. A wear-resistant guide strip is raised and extends from the first housing section to the second housing section along the outer side of the connection between the first and second housing sections. This allows the raised wear-resistant guide strip to support the connection between the connection and the well wall, reducing wear on the connection. Simultaneously, the raised wear-resistant guide strip also provides some crushing and breaking effect on the fractured rock, thereby reducing wear to a certain extent. Specifically, the wear-resistant guide strip can be fixed to the outer side of the connection by welding or by additive manufacturing methods such as laser cladding. The wear-resistant guide strip is made of a more wear-resistant material than the first and second housing sections, or is coated with a wear-resistant coating.

[0036] During drilling, the drive shaft assembly is in front, and the universal joint assembly is behind. The forward protrusion is located at one end of the wear-resistant guide strip on the second outer shell section, allowing it to contact the rock on the well wall first during drilling and break and loosen the rock through compression. The forward protrusion is higher than the rest of the wear-resistant guide strip, enabling it to compress the rock on the well wall to a greater extent, playing a primary role in rock breaking and reducing pressure on other parts of the wear-resistant guide strip and the connection between the first and second outer shell sections.

[0037] This application is based on Figure 1 It is an improvement on the existing screw drilling rig. The specific internal structure of its hydraulic motor assembly, universal joint assembly and drive shaft assembly can be referred to the existing screw drilling tools on the market, and will not be described in detail here.

[0038] Please see Figure 2 As a specific embodiment of the high-strength screw drill with efficient directional drilling capability provided in this application, there are multiple wear-resistant guide strips. The multiple wear-resistant guide strips are distributed circumferentially along the outer side of the connection between the first outer shell section and the second outer shell section, and each wear-resistant guide strip is provided with a forward protrusion.

[0039] In this embodiment, by setting multiple wear-resistant guide strips, a larger area of ​​protection can be formed on the outer side of the connection between the first and second outer shell segments, further reducing wear. Specifically, the number of wear-resistant guide strips is about 3 to 7, the width of a single wear-resistant guide strip is about 8 to 30 mm, and the gap width between two adjacent wear-resistant guide strips is about 10 to 34 mm.

[0040] Please see Figure 2 As a specific embodiment of the high-strength screw drill with efficient directional drilling capability provided in this application, the surface of the connection part between the first outer shell section and the second outer shell section is provided with wear-resistant protrusions located between adjacent wear-resistant guide strips.

[0041] In this embodiment, wear-resistant bumps are used to protect the area between adjacent wear-resistant guide strips of the connecting part, thereby improving wear resistance.

[0042] In practical implementation, PDC (polycrystalline diamond composite) sheets are embedded in the surface of the connection between the first and second outer shell sections to form wear-resistant bumps. The height of the wear-resistant bumps is lower than the height of the wear-resistant guide strip.

[0043] Please see Figure 2 and Figure 4 As a specific embodiment of the high-strength screw drill with efficient directional drilling capability provided in this application, an installation groove is provided on the outer side of the connection between the first outer shell section and the second outer shell section. The installation groove extends from the outer side of the first outer shell section to the outer side of the second outer shell section. The wear-resistant guide strip is embedded in the installation groove and welded and fixed.

[0044] In this embodiment, by setting an installation groove, the welding contact area between the wear-resistant guide strip and the connection part between the first outer shell section and the second outer shell section is increased, thereby improving the welding strength.

[0045] In practice, the mounting groove extends from the first housing segment to the second housing segment. The bottom of the wear-resistant guide strip is inserted into the mounting groove, and bevels are formed on both sides of the bottom of the wear-resistant guide strip, followed by welding at the bevels. The bevels extend to the bottom surface of the wear-resistant guide strip, ensuring that the bottom of the wear-resistant guide strip is essentially welded to both the first and second housing segments. After welding, the welded portion is heated to release welding stress.

[0046] Please see Figure 2 and Figure 3 As a specific embodiment of the high-strength screw drill with efficient directional drilling capability provided in this application, the front end of the protrusion is pointed and fits against the surface of the second outer shell section.

[0047] In this embodiment, during drilling, the pointed front end of the protruding part can gradually apply pressure to the rock on the well wall, causing the rock to break.

[0048] Please see Figures 2 to 4 As a specific embodiment of the high-strength screw drill with efficient directional drilling capability provided in this application, the wear-resistant guide bar has a height of 8-32mm, the height of the front protrusion is greater than 1.5 times the height of the wear-resistant guide bar, and the orthographic projection of the front protrusion on the radial plane of the first outer shell section does not exceed the outer contour of the first outer shell section.

[0049] In this embodiment, the height of the wear-resistant guide strip is 8–32 mm, meaning the height of the wear-resistant guide strip excluding the protruding part is 8–32 mm. This 8–32 mm height not only protects the drill bit body on the outer side of the bend to a certain extent, reducing wear and extending the drill bit's service life, but also prevents excessive resistance increase, which could affect the normal operation of the drill bit. The height of the protruding part is greater than 1.5 times the height of the wear-resistant guide strip, thus ensuring the protruding part's breaking effect on the wellbore rock. However, to avoid excessive breaking, the height of the protruding part is limited so that its orthographic projection on the radial plane of the first outer shell section does not exceed the outer contour of the first outer shell section; that is, viewed axially from the first outer shell section, the protruding part does not extend beyond the outer contour of the first outer shell section.

[0050] In practice, when facing particularly hard geological conditions, if the height of the wear-resistant guide strip exceeds 20mm, the height of the front protrusion can be selected to be only 10mm larger than the height of the wear-resistant guide strip to avoid the front protrusion being too large.

[0051] It should be noted that the height of the protruding part is based on the highest point; the height of the wear-resistant guide strip is based on the average height if there are no local protrusions; and the height of the wear-resistant guide strip is based on the highest point if there are local protrusions.

[0052] The above description is merely a preferred embodiment of this application and is not intended to limit this application. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of this application should be included within the protection scope of this application.

Claims

1. A high-strength screw drill bit with efficient directional drilling capability, characterized in that, include: The hydraulic motor assembly, universal joint assembly, and drive shaft assembly are connected in sequence. The first housing section of the universal joint assembly is connected to the second housing section of the drive shaft assembly at an angle. A wear-resistant guide strip is provided on the outer side of the connection between the first outer shell segment and the second outer shell segment. The wear-resistant guide strip is raised and extends from the outer side of the first outer shell segment to the outer side of the second outer shell segment. The wear-resistant guide strip has a forward protrusion at one end on the second outer shell section, and the height of the forward protrusion is greater than the height of the rest of the wear-resistant guide strip.

2. The high-strength screw drill bit with efficient directional drilling capability as described in claim 1, characterized in that, The wear-resistant guide strips are multiple in number, and the multiple wear-resistant guide strips are distributed circumferentially along the outer side of the connection between the first outer shell segment and the second outer shell segment, and each wear-resistant guide strip is provided with the forward protrusion.

3. The high-strength screw drill bit with efficient directional drilling capability as described in claim 1, characterized in that, The surface of the connection portion between the first housing segment and the second housing segment is provided with wear-resistant protrusions located between adjacent wear-resistant guide strips.

4. The high-strength screw drill bit with efficient directional drilling capability as described in any one of claims 1 to 3, characterized in that, An installation groove is provided on the outer side of the connection between the first outer shell segment and the second outer shell segment. The installation groove extends from the outer side of the first outer shell segment to the outer side of the second outer shell segment. The wear-resistant guide strip is embedded in the installation groove and welded in place.

5. The high-strength screw drill bit with efficient directional drilling capability as described in any one of claims 1 to 3, characterized in that, The front end of the protrusion is pointed and fits against the surface of the second outer shell segment.

6. The high-strength screw drill bit with efficient directional drilling capability as described in any one of claims 1 to 3, characterized in that, The wear-resistant guide strip has a height of 8-32mm, the height of the protruding part is greater than 1.5 times the height of the wear-resistant guide strip, and the orthographic projection of the protruding part on the radial plane of the first housing segment does not exceed the outer contour of the first housing segment.

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