A milling cone structure for a machine-clamped tool block without milling and a method for opening a sleeve window.

Abstract

This invention provides a milling cone structure for a milling cutter block without milling and a method for opening windows in a sleeve. The milling cone structure includes a milling cutter, a milling cone, and a positioning and guiding unit. The milling cutter and the milling cone are fixed by a shear pin. The milling cutter has an upper ramp inside, and the milling cone moves along the upper ramp. The positioning and guiding unit includes a positioning ring and a positioning groove. The positioning groove is opened on the upper ramp, and the positioning ring is located on the milling cone. The positioning ring has a protrusion that cooperates with the positioning groove. This invention performs window opening operations through a milling window opening unit. During the setting process of the milling cutter, the sealing and guiding unit plays a role in sealing and guiding the flow. By adjusting the shape and size of the cutting tool, the angle and size of the groove, and the number of teeth, a window of appropriate size and shape can be opened to achieve the best cutting window opening effect. The positioning and guiding unit positions the milling cone and the milling cutter, ensuring that the milling cone and the milling cutter maintain a certain distance, avoiding the opening of the window by the milling cutter during operation.

Description

Technical Field

[0001] This invention belongs to the field of oil drilling tool technology, specifically relating to a milling cone structure for a clamped tool block without milling and a casing window opening method. Background Technology

[0002] Currently, many oilfields at home and abroad are entering the middle and late stages of development. In order to maintain the integrity of the well network and save costs, small-diameter window sidetracking technology is a new type of oil and gas drilling and development technology to solve the above problems. It mainly uses directional drilling tools and milling cones to grind through the casing for window sidetracking. Its window opening and repair efficiency and cost mainly depend on the quality and price of the milling cone.

[0003] Currently, most side-drilling cones for window opening are made by welding rectangular or columnar cemented carbide onto the main body. During the window opening and repair process, the welding process makes it difficult to ensure the smoothness of the cone end face, resulting in serious drill blockage. The cemented carbide welding wear cannot be repaired in time, affecting the window opening well size and increasing costs.

[0004] The invention patent with patent number CN103195362A, entitled "Integrated Window-Opening Side Drilling Tool", discloses a side drilling tool comprising a hollow milling cone, a guide wedge, and a setting and anchoring device connected in sequence. The guide wedge is locked in the arc-shaped dovetail groove at the lower part of the milling cone by a positioning block. A positioning bolt is provided between the upper end of the guide wedge and the milling cone. A liquid guide tube is provided inside the guide wedge. A secondary water hole is provided on the milling cone at the position corresponding to the positioning bolt. A blind hole communicating with the secondary water hole is provided on the positioning bolt. When the guide wedge is not separated from the milling cone, the positioning bolt blocks the secondary water hole. After the positioning bolt is sheared, the inner hole of the milling cone communicates with the outside through the secondary water hole and the blind hole of the positioning bolt. This side-drilling tool can avoid pump blockage caused by the milling cone nozzle hole being blocked, ensuring that sufficient drilling pressure can be applied when opening the window, increasing the milling speed, and thus improving the window opening efficiency; the fixed guide and milling cone window opening and repair operations can be completed with only one drilling start and stop, which can greatly improve work efficiency and reduce construction costs and labor intensity.

[0005] However, in the aforementioned side-drilling tools, since the guide directional tool is in direct contact with the milling cone, the guide directional tool is prone to wear during the milling cone window opening process. Summary of the Invention

[0006] The purpose of this invention is to provide a milling cone structure for a clamped tool block without milling, thereby overcoming the aforementioned technical problems in the prior art.

[0007] Another objective of this invention is to provide a casing window opening method with high success rate and qualification rate, reduced drilling frequency, and low operational risk.

[0008] Therefore, the technical solution provided by the present invention is as follows: A milling cone structure with a clamp-on tool block and a milling-free inclined device includes an inclined device, a milling cone, and a positioning and guiding unit. The inclined device and the milling cone are fixed by a shear pin. The inclined device has an upper ramp, and the milling cone moves along the upper ramp. The positioning and guiding unit includes a positioning ring and a positioning groove. The positioning groove is formed on the upper slope, the positioning ring is set on the milling cone, and the positioning ring is provided with a protrusion, which cooperates with the positioning groove. The milling cone includes a body, a milling window unit, and a sealing and guiding unit. The milling window unit is located at the front of the body, and the sealing and guiding unit is located inside the body.

[0009] The milling window opening unit includes a first carbide insert and a second carbide insert. The first carbide insert is detachably mounted on the head of the body and is distributed in multiple pieces along the circumference at a certain angle. The second carbide insert is detachably mounted on the neck of the body. The head of the body is conical and the neck of the body is cylindrical.

[0010] The sealing and guiding unit includes a sealing valve core and a guiding device. The sealing valve core is located inside the main body, and the guiding device is located on the wall of the main body. The sealing valve core is located below the guiding device.

[0011] The flow guiding device includes a flow guiding seat and a fixing member. The flow guiding seat has a notch on one side, and the fixing member is located in the notch on one side. The flow guiding seat is fixed to the body by the fixing member.

[0012] The sealing valve core includes a bushing and a sealing seat. The sealing seat is located inside the bushing. The bushing and the sealing seat are connected by a shear pin. A sealing groove is provided between the sealing seat and the bushing. A second sealing groove is provided outside the bushing.

[0013] The sealing valve core is fixed inside the body by a snap ring, and an outer sealing groove is provided on the flow guide seat, and a sealing ring is installed in the outer sealing groove.

[0014] A method for opening a sleeve window, using the aforementioned clamped tool block milling tapered structure without milling, is characterized by comprising the following steps: Step 1) After the liquid in the tubing enters through the flow guiding device of the sealed flow guiding unit, the inclinometer is set. After successful setting, the milling cone is lifted, the shear pin is cut off, and the milling cone is separated from the inclinometer. Step 2) Under hydraulic pressure, the milling cone moves and rotates along the upper slope of the directional device, and the carbide cutting tool at the head of the milling cone body opens a preset window in the inner wall of the sleeve. Step 3) Use two carbide cutting tools on the neck of the milling cone to scrape the preset window, expand and repair the window, and complete the opening.

[0015] After the milling cone separates from the slant, the milling cone rotates relative to the positioning ring and is locked in the positioning groove by the protrusion, positioning the milling cone and the slant, so that the milling cone and the slant maintain a certain distance for window operation, realizing milling-free operation of the slant.

[0016] The beneficial effects of this invention are: The present invention provides a milling cone structure for a clamp-on cutter block without milling. The window-opening operation is performed through a milling window-opening unit. During the setting process of the cutter, the sealing and guiding unit plays a role in sealing and guiding the flow. By adjusting the shape and size of the cutting blade, the angle and size of the notch, and the number of teeth, a window of suitable size and shape can be opened to achieve the best cutting window-opening effect.

[0017] In this invention, the milling taper body has threaded holes machined into the insert mounting slots for each insert. The carbide inserts are fixed to the taper body using socket head cap screws. After the inserts wear down, the worn inserts can be quickly replaced partially or completely on-site by removing the socket head cap screws, enabling the reuse of the milling taper and reducing production costs. The window-opening process using carbide inserts produces more regular, smooth, and unobstructed windows, reducing drill blockage and increasing the success rate of window opening on the first attempt.

[0018] The present invention uses a positioning guide unit to position the milling cone and the slant, so that the milling cone and the slant maintain a certain distance and avoid the opening of the slant during operation. Attached Figure Description

[0019] Figure 1 This is a schematic diagram illustrating an embodiment of the present invention; Figure 2 This is a schematic diagram of one embodiment of the milling cone of the present invention; Figure 3 This is a cross-sectional view of the milling cone of the present invention; Figure 4 This is a cross-sectional view of the flow guiding device; Figure 5 This is a cross-sectional view of the sealing valve core; Figure 6 This is a schematic diagram of the guide seat structure; Figure 7 This is a cross-sectional view of the guide seat.

[0020] In the diagram: 1. Body; 2. Guide seat; 3. Upper ramp; 4. Bushing; 5. Sealing seat; 6. Shear pin one; 7. Ball; 8. Carbide insert two; 9. Carbide insert one; 10. Socket head cap screw; 11. Guide channel; 12. Snap ring; 13. Sealing ring three; 14. Sealing ring two; 15. Sealing ring one; 16. Socket head countersunk screw; 17. Milling taper; 18. Incliner; 19. Locating ring; 20. Protrusion. Detailed Implementation

[0021] The following specific embodiments illustrate the implementation of the present invention. Those skilled in the art can easily understand other advantages and effects of the present invention from the content disclosed in this specification.

[0022] Exemplary embodiments of the present invention will now be described with reference to the accompanying drawings. However, the present invention may be embodied in many different forms and is not limited to the embodiments described herein. These embodiments are provided to fully and completely disclose the invention and to fully convey its scope to those skilled in the art. The terminology used in the exemplary embodiments illustrated in the drawings is not intended to limit the invention. In the drawings, the same units / elements are referred to by the same reference numerals.

[0023] Unless otherwise stated, the terms used herein (including technical terms) have their common meaning as understood by one of ordinary skill in the art. Furthermore, it is understood that terms defined in commonly used dictionaries should be understood to have a meaning consistent with the context of their relevant field, and not to be interpreted as having an idealized or overly formal meaning.

[0024] Example 1 This embodiment provides a milling cone structure for a clamped tool block without milling the inclined plane, such as... Figure 1 As shown, it includes a slant 18, a milling cone 17, and a positioning guide unit. The slant 18 and the milling cone 17 are fixed by a shear pin 6. The slant 18 is provided with an upper ramp 3, and the milling cone 17 moves along the upper ramp 3. The positioning guide unit includes a positioning ring 19 and a positioning groove. The positioning groove is formed on the upper slope 3, the positioning ring 19 is provided on the milling cone 17, and the positioning ring 19 is provided with a protrusion 20, which cooperates with the positioning groove. Usage process: After the milling cone 17 is connected to the tubing, it is lowered into the casing. Water is then injected, and under hydraulic pressure, the slanter 18 is seated inside the casing. The tubing is then lifted, and shear pin 6 cuts it off, separating the slanter 18 and the milling cone 17. Under pressure, the milling cone 17 is pushed along the ramp 3 of the slanter 18, rotating while simultaneously opening a window in the casing. Because the protrusion 20 is engaged in the positioning groove, the milling cone 17 and the slanter 18 are positioned. During the window-opening process of the milling cone 17, a certain distance is maintained between the milling cone 17 and the slanter 18, thus avoiding wear on the slanter 18 and achieving milling-free operation of the slanter 18.

[0025] Example 2 Based on Example 1, this example provides a milling cone structure for a clamped tool block without milling the inclined plane, such as... Figure 2As shown, the milling cone 17 includes a body 1, a milling window unit and a sealing and guiding unit. The milling window unit is located at the front of the body 1, and the sealing and guiding unit is located inside the body 1.

[0026] The milling window opening unit is used for window opening operations. During the setting process of the inclined device 18, the sealing and guiding unit plays the role of sealing and guiding.

[0027] Example 3 Based on Embodiment 2, this embodiment provides a milling cone structure for a clamped tool block without milling the oblique cutter. The milling window unit includes a first carbide insert 9 and a second carbide insert 8. The first carbide insert 9 is detachably mounted on the head of the body 1 and is distributed in multiple pieces along the circumference at a certain angle. The second carbide insert 8 is detachably mounted on the neck of the body 1. The head of the body 1 is conical and the neck of the body 1 is cylindrical.

[0028] The milling taper 17 is machined with insert mounting slots, and threaded holes corresponding to the number and position of the inserts are opened in the mounting slots. Carbide insert 1 (9) and carbide insert 2 (8) are both fixed in the mounting slots with hexagon countersunk screws 16 and connected to the milling taper 17. The insert mounting slots on the milling taper 17 are machined with threaded holes corresponding to each insert. The carbide inserts are fixed to the milling taper 17 with hexagon countersunk screws 16. After the inserts wear out, the worn inserts can be quickly replaced partially or completely on site by removing the hexagon countersunk screws 16, realizing the reuse of the milling taper 17 and reducing the problem of having to replace the entire milling taper 17 after the carbide block wears out. The opened window contour is regular, smooth and unobstructed, reducing drilling blockage. It can realize continuous window opening and repair operations, and the success rate of opening windows on the first try is high.

[0029] The shape and size of the cutting blades, the angle and size of the notch, and the number of teeth can be adjusted according to the well type and window-opening process to create windows of suitable size and shape, achieving the best cutting and window-opening effect. Simultaneously, due to the high strength of the carbide cutting blades and the high efficiency of the cutting and window-opening process, the window-opening time is reduced, eliminating the need for mid-drilling tripping and replacement of the taper 17. This results in a high success rate and pass rate for window opening, reduces the frequency of drilling tripping, and minimizes operational risks.

[0030] Example 4 Based on Embodiment 2, this embodiment provides a milling cone structure for a clamped tool block without milling the inclined plane. The sealing and guiding unit includes a sealing valve core and a guiding device. The sealing valve core is disposed inside the body 1, and the guiding device is disposed on the wall of the body 1. The sealing valve core is located below the guiding device. Figure 3 As shown.

[0031] During the setting process of the inclined device 18, the sealing valve core is sealed, and the liquid flows out through the guide channel 11 of the guide device, such as Figure 7 As shown.

[0032] Example 5 Based on Example 4, this example provides a milling cone structure for a clamped tool block without milling the inclined plane, such as... Figure 4 As shown, the flow guiding device includes a flow guiding seat 2 and a fixing member. The flow guiding seat 2 has a notch on one side, and the fixing member is located in the notch on one side. The flow guiding seat 2 is fixed to the body 1 by the fixing member.

[0033] Flow guide seat 2 as Figure 6 and Figure 7 As shown. In this embodiment, the fixing component is a hexagon socket head cap screw 10, and the flow guide seat 2 is connected to the milling taper 17 through the hexagon socket head cap screw 10.

[0034] Example 6 Based on Example 4, this example provides a milling cone structure for a clamped tool block without milling the inclined plane, such as... Figure 5 As shown, the sealing valve core includes a bushing 4 and a sealing seat 5. The sealing seat 5 is disposed inside the bushing 4. The bushing 4 and the sealing seat 5 are connected by a shear pin. A sealing groove 1 is provided between the sealing seat 5 and the bushing 4, and a sealing groove 2 is provided outside the bushing 4. A sealing ring 15 is provided inside the sealing groove 1, and a sealing ring 14 is provided inside the sealing groove 2.

[0035] Before lowering the washing cone into the well, place the sphere into the sealing seat 5, at which point the fluid passage is closed (e.g., Figure 5 (As shown). After the washing cone and directional device are lowered into the wellhead, the directional device 18 is set. Since the fluid channel is closed, the liquid flows through the flow guide device to the packer part and the mandrel part of the directional device 18, and flows through the mandrel hole to the upper and lower cones, pushing the upper and lower cones to the fixed positions on both sides, pushing the lower slip to fix it to the casing. After it is in place, the upper and lower cones no longer move, thus achieving the setting of the directional device 18.

[0036] After the sealing is completed, the pressure is increased to cut off the second shear pin, the sealing seat 5 separates from the bushing 4, the ball 7 slides down with the sealing seat 5 as a whole, the channel opens, and the liquid flows out through the through hole of the washing cone head.

[0037] Example 7 Based on embodiment 4, this embodiment provides a milling cone structure for a clamped tool block without milling, wherein the sealing valve core is fixed inside the body 1 by a snap ring 12, and an outer sealing groove is provided on the flow guide seat 2, and a sealing ring 3 13 is installed in the outer sealing groove.

[0038] like Figure 4 and Figure 5 As shown, the sealing valve core is confined within the milling cone 17 by a retaining ring 12, wherein the retaining ring 12 is located in the groove on the inner wall of the milling cone 17.

[0039] Example 8 This embodiment provides a method for opening windows in a sleeve, using the aforementioned clamped tool block milling tapered structure without milling, characterized by the following steps: Step 1) After the liquid in the tubing enters through the flow guiding device of the sealed flow guiding unit, the inclinometer 18 is set. After successful setting, the milling cone 17 is lifted, the shear pin is cut off, and the milling cone 17 is separated from the inclinometer 18. Step 2) Under hydraulic pressure, the milling cone 17 moves and rotates along the upper slope 3 of the inclined device 18, and the carbide cutting tool 9 at the head of the milling cone 17 opens a preset window in the inner wall of the sleeve. Step 3) The carbide insert 28 at the neck of the milling taper 17 scrapes the preset window to enlarge and repair the window, thus completing the window opening.

[0040] After the milling cone 17 separates from the slanter 18, the milling cone 17 rotates relative to the positioning ring 19 and is locked in the positioning groove by the protrusion 20, which positions the milling cone 17 and the slanter 18, so that the carbide insert 28 of the milling cone 17 maintains a certain distance from the slanter 18 for opening operations, thus achieving milling-free operation of the slanter 18.

[0041] The above examples are merely illustrative of the present invention and do not constitute a limitation on the scope of protection of the present invention. All designs that are the same as or similar to the present invention are within the scope of protection of the present invention.

Claims

1. A milling cone structure for a clamped tool block without milling, characterized in that: The device includes a slant, a milling cone, and a positioning and guiding unit. The slant and the milling cone are fixed by a shear pin. The slant has an upper ramp, and the milling cone moves along the upper ramp. The positioning and guiding unit includes a positioning ring and a positioning groove. The positioning groove is formed on the upper ramp. The positioning ring is mounted on the milling cone in a manner that allows it to rotate relative to the milling cone. The positioning ring has a protrusion that engages with the positioning groove. After the protrusion is engaged in the positioning groove, the milling cone can rotate relative to the positioning ring, and the carbide insert at the neck of the milling cone body is kept at a certain distance from the slant. The milling cone includes a body, a milling window unit, and a sealing and guiding unit. The milling window unit is located at the front of the body, and the sealing and guiding unit is located inside the body. The milling window-opening unit includes a first carbide insert and a second carbide insert. The first carbide insert is detachably mounted on the head of the body, and multiple first carbide inserts are distributed at an angle along the circumference. The second carbide insert is detachably mounted on the neck of the body. The head of the body is conical, and the neck of the body is cylindrical. The body is machined with insert mounting slots for mounting the first and second carbide inserts, respectively. The insert mounting slots have threaded holes corresponding to the number and position of the first and second carbide inserts. The first and second carbide inserts are fixed in the corresponding insert mounting slots by countersunk head hexagon screws. The sealing and guiding unit includes a sealing valve core and a guiding device. The sealing valve core is disposed within the main body, and the guiding device is disposed on the wall of the main body. The sealing valve core is located below the guiding device. The guiding device includes a guiding seat and a fixing member. One side of the guiding seat has a notch, and one side of the fixing member is disposed within the notch. The guiding seat is fixed to the main body by the fixing member, which is an internal hexagonal head screw. The guiding seat has a guiding channel for guiding the liquid in the tubing to the packer portion of the directional device. The sealing valve core includes a bushing, a sealing seat, a ball, and a second shear pin. The sealing seat is located inside the bushing and connected to the bushing via the second shear pin. The ball is located inside the sealing seat. The sealing valve core has a set-closed state and a window-open state. In the set-closed state, the second shear pin is not cut off, and the ball and the sealing seat together close the fluid passage inside the body. The liquid in the tubing flows through the guide channel to the packer portion of the deflector. In the window-open state, the second shear pin is cut off, and the sealing seat and the ball move downward relative to the bushing and open the fluid passage inside the body, allowing the liquid to flow out through the through hole at the head of the body.

2. The milling cone structure of the clamped tool block without milling the inclined plane according to claim 1, characterized in that: A sealing groove is provided between the sealing seat and the bushing, and a sealing ring is provided inside the sealing groove; a second sealing groove is provided outside the bushing, and a second sealing ring is provided inside the second sealing groove.

3. The milling cone structure for the clamped tool block without milling, as described in claim 1 or 2, is characterized in that: The sealing valve core is fixed inside the body by a snap ring, which is located in the groove on the inner wall of the body; an outer sealing groove is provided on the flow guide seat, and a sealing ring is installed in the outer sealing groove.

4. A method for opening a sleeve window, using the milling cone structure of the clamped tool block without milling as described in any one of claims 1-3, characterized in that, Includes the following steps: Step 1: Before lowering the milling cone into the well, place the ball inside the sealing seat to close the fluid passage inside the body; lower the milling cone and the directional device into the casing, and the liquid in the tubing flows through the guide channel of the guide seat to the packer part of the directional device, causing the directional device to set; after setting, increase the pressure to shear the second shear pin, and the sealing seat and the ball move downward relative to the bushing, opening the fluid passage inside the body, allowing the liquid to flow out through the through hole at the head of the body; lift the milling cone to shear the first shear pin, and the milling cone separates from the directional device; Step 2: Keep the protrusion locked in the positioning groove and rotate the milling cone relative to the positioning ring. The milling cone moves and rotates along the upper slope of the inclined device. The carbide blade one at the head of the body opens a preset window in the inner wall of the sleeve, while the carbide blade two at the neck of the body maintains a certain distance from the inclined device. Step 3: The carbide blade on the neck of the main body is used to scrape, enlarge, and repair the preset window to complete the sleeve opening.

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