A local bending, broken, no channel casing damage well centralizing grinding milling channel equipment

Abstract

This invention relates to the field of petroleum engineering technology, specifically to a straightening milling and channel-drilling device for wells with localized bending, misalignment, and channel-free casing damage. The device includes a hydraulic ball bearing straightening device, comprising a straightening tube and a piston tube. Multiple spiral straightening strips are protruding from the outer circumference of the straightening tube, each with multiple mounting holes, and each mounting hole houses a ball bearing. The piston tube is coaxially located inside the straightening tube, and its outer circumference has a limiting groove. The piston tube can slide up and down to allow the limiting groove to push the ball bearing out of the mounting hole. The spiral straightening strips are divided into multiple groups, evenly distributed around the circumference of the straightening tube. Each group includes two spiral straightening strips, which are staggered circumferentially and overlap vertically, improving the straightening effect and ensuring the tool does not deviate during casing milling and channel drilling.

Description

Technical Field

[0001] This invention relates to the field of petroleum engineering technology, and in particular to a milling and channel-opening device for wells with localized bending, misalignment, and casing damage. Background Technology

[0002] Oilfields are prone to three peak periods of casing damage during development. During these periods, the degree of casing damage undergoes significant and severe changes, manifesting in two main ways: First, wells with localized compression deformation, where the deformation intensifies, causing the deformed casing section to deviate from its original axis. Second, wells with partially broken casing damage, which gradually evolves into completely misaligned casing damage. After misalignment, the casing at the break point experiences significant lateral displacement, drastically reducing the space available for subsequent drilling and greatly hindering casing repair operations.

[0003] To address the repair needs of casing-damaged wells, existing technologies, such as the patent application with publication number CN107780861A, disclose a well-drilling tool that includes a hydraulic expansion device and a hydraulic ball-bearing straightening and cutting device. This tool can thoroughly clean the casing in oil or water wells that has multiple points of bending deformation and casing misalignment deformation, ensuring that the upper and lower ends of the casing remain on the original wellbore's central axis. However, the uneven distribution of balls on the hydraulic ball-bearing straightening and cutting device in this tool can easily lead to poor straightening effect, thus affecting the repair and unblocking of the casing-damaged well. Summary of the Invention

[0004] Therefore, it is necessary to provide a milling and channel-opening device for wells with locally bent, misaligned, or unconnected casing damage, addressing the technical problems of poor straightening effect and the impact on the repair of damaged casing wells caused by current hydraulic ball bearing straightening devices.

[0005] The above objectives are achieved through the following technical solutions: A straightening milling and channel-drilling device for locally bent, misaligned, and channel-free wells includes a hydraulic ball bearing straightening device. The hydraulic ball bearing straightening device includes a straightening tube and a piston tube. The straightening tube extends vertically, and its outer circumferential surface is provided with multiple spiral straightening strips extending circumferentially along the straightening tube. Each spiral straightening strip has multiple mounting holes, which are radially arranged through the straightening tube, and each mounting hole contains a ball bearing. The piston tube is coaxially disposed inside the straightening tube, and its outer circumferential surface has limiting grooves that correspond one-to-one with the mounting holes. The piston tube can slide vertically inside the straightening tube, allowing the limiting grooves to push the ball bearings out of the mounting holes. The spiral straightening strips are divided into multiple groups, evenly distributed around the circumference of the straightening tube. Each group of spiral straightening strips includes two spiral straightening strips distributed vertically. The two spiral straightening strips in the same group are staggered circumferentially around the straightening tube, and have overlapping portions in the vertical direction.

[0006] Furthermore, the horizontal cross-section of the spiral straightening bar is an isosceles trapezoid, with the upper base of the isosceles trapezoid positioned close to the axis of the straightening tube relative to the lower base, thereby forming a receiving groove between the spiral straightening bar and the outer circumferential surface of the straightening tube. The receiving groove is used to accommodate impurities such as sand particles.

[0007] Furthermore, the spiral straightening strip is composed of multiple quadrilateral units connected along the spiral direction, with adjacent quadrilateral units staggered in the circumferential direction of the straightening tube.

[0008] Furthermore, the mounting hole is located at the center of a portion of the quadrilateral unit of the spiral straightening bar.

[0009] Furthermore, the spiral straightening bar is provided in four groups, and each spiral straightening bar has four quadrilateral units, of which three quadrilateral units are provided with mounting holes.

[0010] Furthermore, the spiral straightening bar and the straightening tube are integrally formed.

[0011] Furthermore, the limiting groove is a V-shaped groove that extends in the vertical direction.

[0012] Furthermore, a retaining ring is coaxially provided on the inner wall of the straightening tube, and an annular groove is provided on the outer circumferential surface of the lower end of the piston tube. A return spring is coaxially sleeved in the annular groove. The upper end of the return spring is stopped by the bottom of the annular groove, and the lower end of the return spring is stopped by the retaining ring. The return spring has a tendency to make the piston tube move upward relative to the straightening tube.

[0013] Furthermore, the lower end of the piston tube is provided with a plurality of limiting strips in the circumferential direction, the limiting strips extending in the vertical direction, and the inner wall of the straightening tube is provided with an annular step, the limiting strips and the annular step being engaged in vertical blocking cooperation.

[0014] Furthermore, the lower end of the straightening tube is provided with a threaded connection part, which is used to connect with the tube column.

[0015] The beneficial effects of this invention are: The present invention provides a straightening milling and channel-making device for wells with localized bending, misalignment, and channel-free casing damage. First, by dividing the spiral straightening bar into multiple groups, each group includes two spiral straightening bars distributed vertically. The two spiral straightening bars in the same group are staggered in the circumferential direction of the straightening pipe, and the two spiral straightening bars in the same group have an overlapping part in the vertical direction. This not only does not change the direction of the workover fluid, allowing the workover fluid to pass smoothly, but also makes the balls evenly distributed in the circumferential direction of the straightening pipe, thereby improving the straightening effect of the hydraulic ball straightening device and ensuring that the tool does not deviate during casing milling and channel making.

[0016] Secondly, a receiving groove is formed between the spiral straightening bar and the outer circumference of the straightening pipe. When the workover fluid swirls around the spiral straightening bar, some impurities in the workover fluid will enter the receiving groove and stay there. This can prevent the gap between the well wall and the straightening pipe from having too many sand particles that would cause blockage, reduce the rotational resistance of the hydraulic ball straightening device, and facilitate normal drilling operations.

[0017] Third, each spiral straightening bar has a "staircase" structure. The connection between two adjacent quadrilateral units can act as a reinforcing rib, improving the tensile deformation strength of the spiral straightening bar and preventing the spiral straightening bar from deforming during the rotation of the hydraulic ball bearing straightening device, thus affecting its straightening effect.

[0018] Fourth, the "staircase-like" structure of the spiral centralizer bars better prevents impurities from falling from the well wall downwards, allowing the upward-flowing workover fluid to carry sand and other impurities upwards and out, avoiding blockages. Furthermore, the workover fluid flowing between adjacent spiral centralizer bars creates eddies, which draw in impurities that are clogging between the centralizer bars and the well wall, causing them to flow upwards with the workover fluid, thus preventing impurities from clogging between the centralizer bars and the well wall. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of the overall structure of the hydraulic ball bearing straightening device in a straightening milling and channel-drilling equipment for locally bent, misaligned, and channel-free wells provided in an embodiment of the present invention. Figure 2 A side view schematic diagram of the hydraulic ball bearing straightening device in a straightening milling and channel-drilling equipment for locally bent, misaligned, and channel-free wells provided in an embodiment of the present invention; Figure 3 for Figure 2 Schematic diagram of the AA section; Figure 4 for Figure 2 Schematic diagram of the BB section; Figure 5 for Figure 4 Enlarged view of the structure at point X; Figure 6 This is an exploded schematic diagram of the hydraulic ball bearing straightening device in a straightening milling and drilling equipment for locally bent, misaligned, and channel-free wells provided in an embodiment of the present invention.

[0020] in: 100. Straightening tube; 101. Mounting hole; 102. Spiral straightening bar; 103. Ball bearing; 104. Retaining ring; 105. Annular step; 106. Threaded connection; 200. Piston tube; 201. Limiting groove; 202. Limiting bar; 203. Return spring. Detailed Implementation

[0021] To make the objectives, technical solutions, and advantages of this invention clearer, the invention will be further described in detail below through embodiments and in conjunction with the accompanying drawings. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.

[0022] The component designations used in this document, such as "first" and "second," are merely for distinguishing the described objects and do not have any sequential or technical meaning. The terms "connection" and "linkage" used in this invention, unless otherwise specified, include both direct and indirect connections (linkages). It should be understood that the terms "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," and "counterclockwise," indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings and are used only for the convenience of describing the invention and simplifying the description. They 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, and therefore should not be construed as limiting the invention.

[0023] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature is in indirect contact with the second feature through an intermediate medium. Furthermore, "above," "over," and "on top" of the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0024] like Figures 1 to 6As shown, an embodiment of the present invention provides a straightening milling and channel-drilling device (hereinafter referred to as channel-drilling device) for wells with local bending, misalignment, and no channel damage. The device includes a hydraulic ball bearing straightening device, comprising a straightening tube 100 and a piston tube 200. The straightening tube 100 extends vertically, and its outer circumferential surface is provided with a plurality of spiral straightening strips 102 extending circumferentially along the straightening tube 100. Each spiral straightening strip 102 has a plurality of mounting holes 101, which are radially arranged through the straightening tube 100, and each mounting hole 101 contains a ball bearing 103. The piston tube 200 is coaxially disposed on the straightening tube 100. Inside, the piston tube 200 has a limiting groove 201 on its outer circumferential surface, which corresponds one-to-one with the mounting hole 101. The piston tube 200 can slide up and down inside the straightening tube 100 so that the limiting groove 201 can push the ball 103 out of the mounting hole 101. The spiral straightening strip 102 is divided into multiple groups, which are evenly distributed around the circumference of the straightening tube 100. Each group of spiral straightening strips 102 includes two spiral straightening strips 102 distributed vertically. The two spiral straightening strips 102 in the same group are staggered in the circumference of the straightening tube 100, and the two spiral straightening strips 102 in the same group have an overlapping part in the vertical direction.

[0025] In this embodiment, the spacing between two adjacent spiral centralizing bars 102 is consistent with the spacing between two adjacent spiral centralizing bars 102 in the prior art. This spacing is used to form a chip removal channel, through which the workover fluid in the well wall passes and forms a vortex.

[0026] By dividing the spiral straightening bar 102 into multiple groups, each group includes two spiral straightening bars 102 distributed vertically. The two spiral straightening bars 102 in the same group are staggered in the circumferential direction of the straightening pipe 100, and the two spiral straightening bars 102 in the same group have overlapping parts in the vertical direction. This not only does not change the direction of the workover fluid, allowing the workover fluid to pass smoothly, but also makes the balls 103 evenly distributed in the circumferential direction of the straightening pipe 100, thereby improving the straightening effect of the hydraulic ball straightening device and ensuring that the tool does not deviate when milling and drilling the channel.

[0027] Furthermore, the horizontal cross-section of the spiral straightening bar 102 is an isosceles trapezoid, with the upper base of the isosceles trapezoid positioned close to the axis of the straightening tube 100 relative to the lower base, thereby forming a receiving groove between the spiral straightening bar 102 and the outer circumferential surface of the straightening tube 100. The receiving groove is used to receive impurities such as sand particles.

[0028] Since the repair of damaged wells involves sand flushing and drilling operations, a large amount of flushing sand and drilling debris will remain on the well wall. By setting up a receiving tank, when the workover fluid swirls around the spiral straightening strip 102, some impurities in the workover fluid will enter the receiving tank and stay there. This can prevent the gap between the well wall and the straightening pipe 100 from being blocked by a lot of sand particles, reduce the rotational resistance of the hydraulic ball straightening device, and facilitate the normal operation of the well-drilling equipment.

[0029] Furthermore, the spiral straightening strip 102 is composed of multiple quadrilateral units connected along the spiral direction, with adjacent quadrilateral units staggered in the circumferential direction of the straightening tube 100.

[0030] In this way, each spiral straightening bar 102 has a "staircase" structure. The connection between two adjacent quadrilateral units acts as a reinforcing rib, improving the tensile strength of the spiral straightening bar 102 and preventing deformation of the spiral straightening bar 102 during the rotation of the hydraulic ball bearing straightening device, which would affect its straightening effect. Secondly, this "staircase" structure can better prevent impurities in the well wall from falling from top to bottom, allowing the upward-flowing well-working fluid to fully carry sand and other impurities upward and discharge them, avoiding blockage. Thirdly, because the well-working fluid flowing between two adjacent spiral straightening bars 102 forms a vortex, this vortex will draw in impurities that are blocking the space between each spiral straightening bar 102 and the well wall, causing them to flow upward with the well-working fluid, thereby preventing impurities from clogging between the spiral straightening bar 102 and the well wall.

[0031] Furthermore, the mounting hole 101 is located at the center of a portion of the quadrilateral units of the spiral straightening bar 102. This eliminates the need to provide a mounting hole 101 on each quadrilateral unit, ensuring that the number of mounting holes 101 remains consistent in the circumferential direction, thereby resulting in a uniform distribution of the balls 103 on the straightening tube 100.

[0032] Furthermore, the spiral straightening bar 102 is provided in four groups, and each spiral straightening bar 102 has four quadrilateral units, of which three quadrilateral units are provided with mounting holes 101. Specifically, the lower three quadrilateral units of the lower spiral straightening bar 102 are provided with mounting holes 101, and the upper three quadrilateral units of the upper spiral straightening bar 102 are provided with mounting holes 101.

[0033] Furthermore, the spiral straightening bar 102 and the straightening tube 100 are integrally formed. This structure is simple and easy to process.

[0034] Furthermore, the limiting groove 201 is a V-shaped groove that extends in the vertical direction. Thus, when the piston tube 200 moves up and down, the inclined surface within the V-shaped groove can push the ball bearing 103 out of the mounting hole 101.

[0035] Furthermore, a retaining ring 104 is coaxially provided on the inner wall of the straightening tube 100, and an annular groove is provided on the outer circumferential surface of the lower end of the piston tube 200. A return spring 203 is coaxially sleeved in the annular groove. The upper end of the return spring 203 is in a stop-fitting engagement with the bottom of the annular groove, and the lower end of the return spring 203 is in a stop-fitting engagement with the retaining ring 104. The return spring 203 has a tendency to cause the piston tube 200 to move upward relative to the straightening tube 100. By providing the return spring 203, the piston tube 200 can be automatically reset.

[0036] Furthermore, the lower end of the piston tube 200 is provided with a plurality of limiting strips 202 in a circumferential direction. The limiting strips 202 extend in the vertical direction, and the inner wall of the straightening tube 100 is provided with an annular step 105. The limiting strips 202 and the annular step 105 are engaged in vertical blocking cooperation. The limiting strips 202 can prevent the piston tube 200 from tilting and limit the lowest position of the piston tube 200.

[0037] Furthermore, the lower end of the straightening tube 100 is provided with a threaded connection part 106, which is used to connect with the tube column.

[0038] The hydraulic ball bearing straightening device in the straightening milling and channel-drilling equipment for locally bent, misaligned, and channel-damaged wells of this invention has the following usage process and working principle: After the hydraulic ball bearing straightening device is connected to the tubing string, it is lowered into the well together. When a breakthrough repair operation is required, hydraulic pressure is applied to the piston tube 200. The hydraulic pressure pushes the piston tube 200 downward and compresses the return spring 203. The limiting groove 201 on the piston tube 200 applies a thrust to the ball bearing 103 simultaneously using the inclined surface, driving the ball bearing 103 to extend out of the mounting hole 101, so that the ball bearing 103 contacts the well wall to achieve the straightening function. After the breakthrough repair operation is completed, the pump is stopped to make the hydraulic pressure disappear. The elastic return force of the return spring 203 pushes the piston tube 200 upward to return to its original position. The thrust on the ball bearing 103 disappears, so the ball bearing 103 retracts into the mounting hole 101. The ball bearing 103 can achieve the straightening function and reduce the friction between the tubing string and the well wall.

[0039] This invention also provides a method for straightening and milling through a partially bent, misaligned, and unobstructed well with casing damage: (1) Casing damage detection and verification of casing damage status: The casing damage area is detected by using lead mold printing and well cleaning tools to verify the casing damage status. The specific operation method is as follows: after the sucker rod and tubing are pulled out of the wellbore, a large lead mold with a diameter 6mm to 8mm smaller than the inner diameter of the casing and a small lead mold with a diameter of 90mm are used to print, and the casing damage diameter is determined by the lead mold imprint; then, well cleaning tools with an outer diameter of Φ73mm, Φ60mm, Φ45mm, and Φ30mm and a length of 1m to 5m are used to perform well cleaning detection to determine the approximate range of the casing damage diameter below the depth where the lead mold is blocked.

[0040] (2) Preparation of tools: Prepare a series of tools for straightening and milling that match the specifications and dimensions of the casing. These mainly include milling column, milling tapered short section, straightener, drill collar, well gauge, cutting and grinding tool, spiral drill collar, and hydraulic ball straightener. In the past, the tools prepared for milling and grinding the casing string were only milling and grinding tools and drill collar. Connecting the drill collar above the milling and grinding tool to directly mill the damaged section of the casing and create a channel would result in unsatisfactory straightening effect, low milling efficiency due to unreasonable selection of milling and grinding tools, and casing window problems. The tools prepared in this invention include milling column, milling tapered short section, straightener, well gauge, hydraulic ball straightener, and cutting and grinding tool. The hydraulic ball straightener adopts the above-mentioned hydraulic ball straightening device. Its structural features are as follows: First, the function of the milling column and milling tapered short section is to trim the casing above the fracture to ensure that the subsequent tool string can be smoothly lowered to the fracture position. II. The purpose of the wellbore gauge is to verify the effectiveness of the milling column and milling cone in trimming the casing above the fracture. If the desired effect is achieved, the clamping force of the wellbore gauge when raising and lowering the section above the fracture should be less than 5 kN. III. Centralizers, hydraulic ball centralizers, drill collars, and auger collars are rigid tools. When used in combination with cutting tools, they can reduce the lateral offset of the cutting tools and play a forced centralizing role.

[0041] (3) Repairing the casing above the fracture: The purpose is to allow subsequent large-diameter tools and tubing to be smoothly lowered above the fracture. Use a milling string or milling taper to short-circuit (or a combination thereof) to repair the casing above the fracture. This is a newly added step. In the past, milling operations omitted this step and directly used the milling string to mill the damaged section of the casing. Often, the tubing string would encounter obstruction before reaching the fracture depth, making it impossible to directly mill the fracture to create a channel.

[0042] Tubing structure: from bottom to top, it consists of a milled column or milled taper short section + short drill collar + centralizer + short drill collar + centralizer + drill pipe + square drill pipe.

[0043] Technical requirements: For deformed sections of the sleeve above the break, use a rotary milling method for repeated repair. During repair, the circulation flow rate should be ≥0.4m. 3 / min; After the sleeve is repaired, the clamping force of the tubing is less than 5kN when lifting and lowering.

[0044] Operating procedure: After connecting the tubing string, lower it into the wellbore to the depth where resistance is encountered. Start the pump, with a circulation rate greater than 0.4 m³ / h. 3 / min. The rotary table drives the tubing string to rotate, and the tubing string is lowered, with the drilling pressure controlled within 30kN. After the rotary milling reaches the fracture depth, the tubing string is raised and lowered in the milled section, with the clamping force less than 5kN, and the milling is completed.

[0045] (4) Checking the effect of the casing repair: This is a routine step, the purpose of which is to check the effect of the casing repair using a well gauge and lead mold, and at the same time to predict the passability of the forced straightening milling string. String structure: lead mold + well gauge + drill pipe (oil tubing).

[0046] Technical requirements: After the lowering string approaches the depth of the lower break, the lowering speed should be less than 5m / min. If resistance is encountered, apply pressure of 20kN to 30kN. Do not repeat the printing process after encountering resistance. The clamping force of the lowering string above the break should be less than 5kN to be considered qualified.

[0047] (5) Forced centralization milling to create channels: Forced centralization milling is used to create channels in the damaged well section. Tubing string structure: From bottom to top: cutting tool + auger collar (length selected according to actual conditions) + hydraulic ball centralizer + short drill collar + hydraulic ball centralizer + short drill collar + hydraulic ball centralizer + short drill collar + hydraulic ball centralizer + drill pipe + angular drill pipe.

[0048] Technical Requirements: Before running the hydraulic ball bearing centralizer, conduct a wellhead pressure test to ensure that the overall outer diameter of the tool reaches the specified size after the steel balls emerge from the centralizer. If the 103 balls do not fit tightly against the inner wall of the casing, a gap will form between the centralizer and the inner wall of the casing, causing the tubing string to shake during milling and affecting the centralizing effect. During milling, the drilling pressure should be controlled between 5kN and 10kN, and the machine speed should be controlled between 60r / min and 100r / min for optimal milling effect. Every 20cm to 50cm of milling, a lead mold should be used to check whether the fracture channel has increased. Combined with the amount of iron filings returned from the wellhead (an increase in the amount of iron filings indicates a good cutting and grinding effect), if the fracture channel reaches Φ73mm or more (meeting the requirement that the tool for finding channels with an outer diameter of Φ60mm and Φ73mm can pass through the fracture), the next step of channel finding construction can proceed.

[0049] This channeling method can address complex casing damage issues that traditional processes cannot handle, particularly in wells with locally curved or misaligned casing. Furthermore, by pre-treating the casing with a milling column / taper and precisely cutting the cutting tool, combined with an optimal drill pressure of 5kN–10kN and a rotation speed of 60r / min–100r / min, milling efficiency is improved by more than 30% compared to traditional methods. The hydraulic ball bearing stabilizer, as described in the previous embodiment, provides forced centering force, reduces lateral deviation of the cutting tool, and, combined with uniformly applied drill pressure, effectively prevents casing windowing.

[0050] An example of a method for straightening and milling through a partially bent, misaligned, and unconnected well with casing damage: Well A, with a 40mm diameter and a bent, discontinuous section at 407.2m, was initially treated using conventional methods: milling with a 120mm flat-bottomed grinding shoe, milling with a 118mm sleeve milling sleeve, and even using a pen tip to find the channel, all without success. A method of straightening and milling to create a channel was then employed, ultimately opening the channel to 75mm, resulting in successful remediation.

[0051] a. The upper broken sleeve is repeatedly ground by uniform milling of the sleeve column, and the clamping force is less than 2.5kN.

[0052] b. The effect of the sleeve repair was tested by testing the test string. A 120mm lead mold + 120mm gauge + 114mm drill collar were used. The clamping force was less than 2.5kN, and the effect of the sleeve repair was qualified.

[0053] c. A milling and grinding string was used to forcefully straighten and mill the lower fracture surface to create a shoulder. Before running it into the well, a wellhead test was conducted on the hydraulic ball centralizer. When pressure was applied to 10 MPa, ball 103 was exposed, and the outer diameter of the hydraulic ball centralizer reached 126.5 mm, proving the tool was effective. During shoulder creation, the drilling pressure was 3 kN–5 kN, the machine speed was 90 r / min, and the drilling speed was 100 mm / h. After milling 200 mm to a depth of 407.4 m, the drill string was pulled out for lead mold printing.

[0054] d. Based on the lead mold imprint, no shoulder was found. Replace the cutting tool and repeat "step c". Mill from 407.2m to 407.4m again, adjusting the feed rate to 50mm / h, while keeping the rotation speed and drilling pressure unchanged.

[0055] e. Based on the lead mold imprint, a shoulder has been created. Repeat step c, milling from 407.4m to 407.9m, keeping the drilling pressure, rotation speed, and feed rate constant.

[0056] f. Based on the lead mold imprint, the borehole diameter has reached Φ50mm. Adjust the forced-center milling string structure, add a spiral drill collar (1.5m in length) between the cutting tool and the centering device, repeat "step c", adjust the feed rate to 100mm / h, the rotation speed to 100r / min, and keep the drilling pressure unchanged, and mill from a well depth of 407.9m to 408.7m.

[0057] g. Based on the lead mold imprint, the diameter had reached Φ75mm. Conventional techniques such as punching, filing, and milling were then used to open the channel, and the problem was successfully resolved.

[0058] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0059] The embodiments described above are merely illustrative of several implementations of the present invention, and while the descriptions are specific and detailed, they should not be construed as limiting the scope of the invention. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of the present invention, and these modifications and improvements all fall within the scope of protection of the present invention. Therefore, the scope of protection of the present invention should be determined by the appended claims.

Claims

1. A righting and milling pass-through device for partially curved, broken and uncased damaged well, comprising a hydraulic ball righting device, characterized in that, The hydraulic ball bearing straightening device includes: The straightening tube extends in the vertical direction, and a plurality of spiral straightening strips extending in the circumferential direction are protruding on its outer circumferential surface. Each spiral straightening strip is provided with a plurality of mounting holes, which are arranged radially through the straightening tube, and a ball is locked inside each mounting hole. A piston tube is coaxially disposed inside the straightening tube. A limiting groove is provided on the outer circumferential surface of the piston tube, and the limiting groove corresponds one-to-one with the mounting hole. The piston tube can slide up and down inside the straightening tube so that the limiting groove can push the ball to extend out of the mounting hole. The spiral straightening strips are divided into multiple groups, and the multiple groups of spiral straightening strips are evenly distributed around the circumference of the straightening tube. Each group of spiral straightening strips includes two spiral straightening strips distributed vertically. The two spiral straightening strips in the same group are staggered in the circumference of the straightening tube, and the two spiral straightening strips in the same group have overlapping parts in the vertical direction.

2. The centralizing mill-through-the-tunnel equipment for partially bent, broken, and uncased lost-well hole according to claim 1, characterized in that, The horizontal cross-section of the spiral straightening bar is an isosceles trapezoid, with the upper base of the isosceles trapezoid positioned close to the axis of the straightening tube relative to the lower base, thereby forming a receiving groove between the spiral straightening bar and the outer circumferential surface of the straightening tube. The receiving groove is used to receive sand particles.

3. The centralizing mill-through-the-tunnel device for partially curved, broken, and unchanneled casing damage well according to claim 2, characterized in that, The spiral straightening strip is composed of multiple quadrilateral units connected along the spiral direction, with adjacent quadrilateral units staggered around the circumference of the straightening tube.

4. The milling and channel-driving equipment for locally bent, misaligned, and channel-free wells according to claim 3, characterized in that, The mounting hole is located at the center of a portion of the quadrilateral unit of the spiral straightening bar.

5. The straightening milling and channel-driving equipment for locally bent, misaligned, and channel-free wells according to claim 4, characterized in that, The spiral straightening bar is provided in four groups, and each spiral straightening bar has four quadrilateral units, of which three quadrilateral units are provided with mounting holes.

6. The milling and channel-driving equipment for locally bent, misaligned, and channel-free wells according to claim 1, characterized in that, The spiral straightening bar and the straightening tube are integrally formed.

7. The milling and channel-driving equipment for locally bent, misaligned, and channel-free wells according to claim 1, characterized in that, The limiting groove is a V-shaped groove that extends in the vertical direction.

8. The milling and channel-driving equipment for locally bent, misaligned, and channel-free wells according to claim 1, characterized in that, The inner wall of the straightening tube is coaxially provided with a retaining ring, and the lower end of the piston tube is provided with an annular groove. A return spring is coaxially sleeved in the annular groove. The upper end of the return spring is stopped by the bottom of the annular groove, and the lower end of the return spring is stopped by the retaining ring. The return spring has the tendency to make the piston tube move upward relative to the straightening tube.

9. The milling and channel-driving equipment for locally bent, misaligned, and channel-free wells according to claim 1, characterized in that, The lower end of the piston tube is provided with multiple limiting strips in a circumferential direction. The limiting strips extend in the vertical direction. The inner wall of the straightening tube is provided with an annular step. The limiting strips and the annular step are engaged in vertical blocking.

10. The straightening milling and channel-driving equipment for locally bent, misaligned, and channel-free wells according to claim 1, characterized in that, The lower end of the straightening tube is provided with a threaded connection part, which is used to connect with the tube column.

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