Windowing positioning milling cone

Abstract

The invention belongs to the technical field of well drilling equipment, and discloses a windowing positioning milling cone which is used for windowing operation of an old well casing and comprises a connector, a drill bit and a guide part. One end of the joint is connected to the driving mechanism; the drill bit is fixedly connected to the end, away from the driving mechanism, of the connector and is configured to cut and mill the side wall of the sleeve. The guide part is connected to the end, away from the connector, of the drill bit, a whipstock is arranged in the casing pipe, in the direction away from the guide part, one side of the whipstock is attached to the casing pipe, the other side of the whipstock is a guide face, the distance between the guide face and the inner wall of the casing pipe is gradually reduced, and the guide part can abut against the guide face. Under driving of the driving mechanism, the connector can drive the drill bit to rotate in the axial direction of the drill bit, the guide part can abut against the guide face, the drill bit can move along the guide face and gradually approach the side wall of the casing pipe, so that windowing operation is completed, the contact area of the drill bit and the whipstock in the rotating process is reduced, and the tip of the whipstock is prevented from being abraded or even abraded through.

Description

Technical Field

[0001] This invention relates to the field of drilling equipment technology, and in particular to a window-opening positioning milling cone. Background Technology

[0002] Developing the remaining oil reservoir by drilling through the casing of old wells is an effective method to restore production of old wells and improve oil and gas recovery.

[0003] In the existing technology of window milling cone, due to the influence of well structure and construction design, some old well casings have high steel grade, high hardness and thick walls, which leads to excessive milling damage to the tip of the directional device during the window opening process, and may even further damage the directional device body and anchoring mechanism, ultimately causing the window opening to fail. Summary of the Invention

[0004] The purpose of this invention is to provide a window-opening positioning milling cone that minimizes wear on the slant and facilitates positioning.

[0005] To achieve this objective, the present invention adopts the following technical solution:

[0006] A window-opening positioning milling cone, configured to extend into a sleeve and open a window on the side wall of the sleeve, is characterized by comprising:

[0007] The connector is connected at one end to the drive mechanism;

[0008] A drill bit is fixedly connected to the end of the joint away from the drive mechanism, and the drill bit is configured to cut and mill the sidewall of the casing;

[0009] A guide section is connected to the end of the drill bit away from the connector. A directional device is provided in the casing. In the direction away from the guide section, one side of the directional device is attached to the casing, and the other side is a guide surface. The distance between the guide surface and the inner wall of the casing gradually decreases, and the guide section can press against the guide surface.

[0010] Preferably, the drill bit comprises:

[0011] Matrix

[0012] Multiple cutting blocks are spaced apart around the outer periphery of the substrate;

[0013] The milling block is provided in multiple parts, and the milling block is arranged at intervals on the cutting block.

[0014] Preferably, the substrate is provided with a diameter-preserving portion and a frustum-shaped portion connected to each other. The diameter-preserving portion is cylindrical, and the frustum-shaped portion is truncated cone-shaped. The diameter of the frustum-shaped portion gradually decreases in the direction away from the diameter-preserving portion.

[0015] Preferably, the cutting block is elongated and angled relative to the axial direction of the substrate.

[0016] Preferably, the material of the cutting block is an alloy.

[0017] Preferably, the milling block is made of an alloy and is granular.

[0018] Preferably, the substrate is further provided with multiple guide grooves at intervals, each of which is located between two adjacent cutting blocks.

[0019] Preferably, the guide portion is cylindrical, and the end of the guide portion away from the drill bit is provided with a rounded corner.

[0020] Preferably, the outer surface of the guide portion is provided with a water eye, and the connector, the drill bit and the guide portion are provided with water channels inside, and the water eye is connected to the water channels.

[0021] Preferably, the guide portion is detachably connected to the drill bit.

[0022] The beneficial effects of this invention are:

[0023] Driven by the drive mechanism, the joint can drive the drill bit to rotate around its own axis. The guide part cooperates with the directional device in the casing. The guide part can press against the guide surface, so that the drill bit can move along the guide surface and gradually approach the side wall of the casing to complete the window opening operation, reduce the contact area between the drill bit and the directional device during rotation, and prevent the tip of the directional device from wearing or even being worn through. Attached Figure Description

[0024] Figure 1 This is a half-sectional view of the window-opening positioning milling cone described in this invention;

[0025] Figure 2 yes Figure 1 Side view in the AA direction;

[0026] Figure 3 This is a cross-sectional view of the window positioning described in this invention when it is located in the sleeve.

[0027] In the picture:

[0028] 100. Sleeve;

[0029] 200. Incliner; 201. Guide surface;

[0030] 1. Connector;

[0031] 2. Drill bit; 21. Base; 211. Gauge protection section; 212. Frustum section; 22. Cutting block; 23. Milling block; 24. Guide groove;

[0032] 3. Guiding section; 31. Water inlet. Detailed Implementation

[0033] Embodiments of the present invention are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar components or components having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and intended to explain the present invention, and should not be construed as limiting the present invention.

[0034] In the description of this invention, unless otherwise explicitly specified and limited, the terms "connected," "linked," and "fixed" should be interpreted broadly. For example, they can refer to a fixed connection or a detachable connection; a mechanical connection or an electrical connection; a direct connection or an indirect connection through an intermediate medium; or the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0035] In the description of this invention, unless otherwise expressly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature being directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature being directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0036] The technical solution of the present invention will be further described below with reference to the accompanying drawings and specific embodiments.

[0037] like Figures 1-3 As shown, the present invention provides a window-opening positioning milling cone for window-opening operations on old well casing 100. The window-opening positioning milling cone is configured to extend into the casing 100 and open a window on the side wall of the casing 100. The window-opening positioning milling cone includes a connector 1, a drill bit 2, and a guide portion 3. One end of the connector 1 is connected to a drive mechanism; the drill bit 2 is fixedly connected to the end of the connector 1 away from the drive mechanism, and the drill bit 2 is configured to cut and mill the side wall of the casing 100; the guide portion 3 is connected to the end of the drill bit 2 away from the connector 1. A deflector 200 is provided in the casing 100. In the direction away from the guide portion 3, one side of the deflector 200 abuts against the casing 100, and the other side is a guide surface 201. The distance between the guide surface 201 and the inner wall of the casing 100 gradually decreases, and the guide portion 3 can press against the guide surface 201.

[0038] Driven by the drive mechanism, the connector 1 can drive the drill bit 2 to rotate around its own axis. The guide part 3 cooperates with the directional device 200 in the casing 100. The guide part 3 can press against the guide surface 201, so that the drill bit 2 can move along the guide surface 201 and gradually approach the side wall of the casing 100 to complete the window opening operation, reduce the contact area between the drill bit 2 and the directional device 200 during rotation, and prevent the tip of the directional device 200 from being worn or even worn through.

[0039] Specifically, the drill bit 2 includes a base 21, cutting blocks 22, and milling blocks 23. Multiple cutting blocks 22 are spaced apart around the outer periphery of the base 21; multiple milling blocks 23 are also provided, spaced apart on the cutting blocks 22. With this arrangement, the cutting blocks 22 and milling blocks 23 cooperate, and together, driven by the base 21, cut and mill the inner wall of the casing 100.

[0040] Preferably, in this embodiment, both the cutting block 22 and the milling block 23 are made of alloy, and the milling block 23 is granular. In other embodiments, the cutting block 22 and the milling block 23 may be made of other materials, which are not specifically limited here.

[0041] Preferably, in this embodiment, six cutting blocks 22 are spaced apart and are centrally symmetrically distributed about the axis of the drill bit 2.

[0042] More specifically, the base 21 is provided with an interconnected diameter-maintaining portion 211 and a frustum-shaped portion 212. The diameter-maintaining portion 211 is cylindrical, and the frustum-shaped portion 212 is truncated cone-shaped. The diameter of the frustum-shaped portion 212 gradually decreases in the direction away from the diameter-maintaining portion 211. The aforementioned frustum-shaped portion 212 cooperates with the directional tool 200 to increase the contact area between the drill bit 2 and the inner wall of the casing 100, thereby improving the window opening efficiency.

[0043] Preferably, in this embodiment, the cutting block 22 is elongated and angled to the axial direction of the base 21. In other embodiments, the cutting block 22 may also have other shapes, which are not specifically limited here.

[0044] Specifically, multiple guide grooves 24 are spaced apart on the base 21, with each guide groove 24 located between two adjacent cutting blocks 22. The guide grooves 24 facilitate the discharge of iron filings and rock cuttings, and prevent iron filings and rock cuttings from jamming the drill bit 2 in the casing 100.

[0045] More specifically, the guide portion 3 is cylindrical, and the end of the guide portion 3 away from the drill bit 2 is provided with a rounded corner. The above-mentioned configuration can prevent damage to the directional device 200.

[0046] Specifically, a water eye 31 is provided on the outer surface of the guide part 3, and water channels are provided inside the connector 1, the drill bit 2, and the guide part 3, with the water eye 31 connected to the water channels. This arrangement, with the water eye 31 and the water channels working together, allows water flow to cool the drill bit 2 and prevent overheating.

[0047] Specifically, the guide part 3 is detachably connected to the drill bit 2. This configuration allows for the configuration of guide parts 3 and directional cutters 200 of different sizes depending on the diameter of the casing 100, achieving the desired window-opening effect. Furthermore, during the window-opening process, after the drill bit 2 partially embeds into the inner wall of the casing 100, the drill bit 2 will not rub against the directional cutter 200. In this case, the guide part 3 can be replaced with a commonly used window-opening milling taper to improve window-opening efficiency. Alternatively, drilling can be directly initiated, and the window-opening operation can continue using a commonly used window-opening milling taper.

[0048] Obviously, the above embodiments of the present invention are merely examples for clearly illustrating the present invention, and are not intended to limit the implementation of the present invention. Those skilled in the art can make other variations or modifications based on the above description. It is neither necessary nor possible to exhaustively describe all embodiments here. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention should be included within the scope of protection of the claims of the present invention.

Claims

1. A window-opening positioning milling cone, configured to extend into a sleeve (100) and open a window on the side wall of the sleeve (100), characterized in that, include: Connector (1), one end of which is connected to the drive mechanism; A drill bit (2) is fixedly connected to one end of the connector (1) away from the drive mechanism, and the drill bit (2) is configured to cut and mill the sidewall of the casing (100); The guide part (3) is connected to the end of the drill bit (2) away from the joint (1). The casing (100) is provided with a directional device (200). In the direction away from the guide part (3), one side of the directional device (200) is attached to the casing (100), and the other side is a guide surface (201). The distance between the guide surface (201) and the inner wall of the casing (100) gradually decreases, and the guide part (3) can press against the guide surface (201).

2. The window-opening positioning milling cone according to claim 1, characterized in that, The drill bit (2) includes: Matrix (21), Multiple cutting blocks (22) are provided at intervals around the outer periphery of the base (21); There are multiple milling blocks (23), which are spaced apart on the cutting block (22).

3. The window-opening positioning milling cone according to claim 2, characterized in that, The base (21) is provided with a diameter-protecting part (211) and a frustum-shaped part (212) connected to each other. The diameter-protecting part (211) is cylindrical and the frustum-shaped part (212) is frustum-shaped. The diameter of the frustum-shaped part (212) gradually decreases in the direction away from the diameter-protecting part (211).

4. The window-opening positioning milling cone according to claim 2, characterized in that, The cutting block (22) is elongated and is angled relative to the axial direction of the base (21).

5. The window-opening positioning milling cone according to claim 2, characterized in that, The material of the cutting block (22) is an alloy.

6. The window-opening positioning milling cone according to claim 2, characterized in that, The milling block (23) is made of an alloy and is granular.

7. The window-opening positioning milling cone according to claim 2, characterized in that, The substrate (21) is also provided with a plurality of guide grooves (24) spaced apart, each of the guide grooves (24) being located between two adjacent cutting blocks (22).

8. The window-opening positioning milling cone according to any one of claims 1-7, characterized in that, The guide part (3) is cylindrical, and the end of the guide part (3) away from the drill bit (2) is provided with a rounded corner.

9. The window-opening positioning milling cone according to any one of claims 1-7, characterized in that, The guide part (3) has a water eye (31) on its outer surface, and the connector (1), the drill bit (2) and the guide part (3) have water channels inside, with the water eye (31) connected to the water channel.

10. The window-opening positioning milling cone according to any one of claims 1-7, characterized in that, The guide part (3) is detachably connected to the drill bit (2).

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