Half-slope type strong magnetic fisher capable of reaming
By using 42CrMo ultra-high strength steel material and single-wheel drill bit design, the problems of insufficient structural strength and eye-clawing ability of the half-slope strong magnetic salvager are solved, and efficient downhole salvage and eye-clawing functions are achieved, reducing construction costs.
Patent Information
- Application Number
- CN202422844698.7
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-11-21
- Publication Date
- 2025-07-18
- Estimated Expiration
- 2034-11-21
AI Technical Summary
The existing half-slope strong magnetic salvage has insufficient structural strength, the lower structure of the salvage main body is unreasonable, easy to be crushed, the salvage effect is poor, and it is difficult to effectively draw the eye in complex underground conditions, resulting in the failure of salvage.
The semi-cylindrical structure of 42CrMo ultra-high strength steel is adopted to enhance the strength of the salvage main body, and a single-wheel drill bit is installed at the lower part. It is combined with the thrust bearing structure, which increases the eye-cut function and improves the water flow channel design to enhance the hydraulic flow impulse.
It improves the structural strength and eye-grabbing ability of the salvage, shortens the construction cycle, reduces the probability of complex situations, improves the salvage efficiency and effect, and reduces costs.
Smart Images
Figure CN223119885U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to a strong magnetic fishing tool, in particular to a reaming semi-slope type strong magnetic fishing tool, belonging to the technical field of downhole fishing tools for wellbore falling objects. Background Technique
[0002] In oilfield drilling, the strong magnetic fishing tool is mainly used to fish magnetizable metal debris in the well to purify the bottom of the well. Currently, the common strong magnetic fishing tools are of two types: cylindrical type and semi-slope type. The magnet of the cylindrical fishing tool is located inside the main body, and the magnet of the semi-slope type fishing tool is located on the slope of the main body.
[0003] The traditional strong magnetic fishing tool has the following problems:
[0004] 1. The structural strength of the commonly used semi-slope type strong magnetic fishing tool in drilling construction is insufficient, and the structure at the lower part of the fishing tool main body is unreasonable, with the upper part thick and the lower part thin, and the pressure-bearing and impact resistance at the bottom end are relatively weak; once it encounters resistance during the lowering process, it is easily crushed, resulting in an increase in complexity, an increase in fishing costs, and serious economic losses.
[0005] 2. The included angle between the transition zone of the fishing tool main body and the slope is unreasonably designed. When the drilling fluid circulates and scours the bottom of the well, eddy currents are easily generated between the transition zone of the fishing tool main body and the slope, and the flushed cuttings gather and fill the gap between the transition zone and the slope, which is not conducive to the adsorption of the magnet and affects the fishing effect.
[0006] 3. The traditional semi-slope type strong magnetic fishing tool can only be lowered when the downhole conditions are normal. When it is necessary to lower the strong magnetic fishing tool to fish for metal falling objects, there are often complex downhole conditions. When the tool is being drilled down, if it encounters well sections such as collapse or hole shrinkage, or encounters resistance when hitting a step during the downhole drilling, the fishing tool can only be slightly rotated and ground using the surface inserted teeth. The strength of the surface inserted teeth of the fishing tool is not enough, and it does not have the ability to ream the hole, resulting in a long time consumption and little effect.
[0007] 4. The front end of the semi-slope type strong magnetic fishing tool, which is similar to a shovel blade, is extremely easy to scrape the wellbore mud cake and the cuttings bed in the well section with thick drilling fluid virtual mud cake or thick cuttings bed in the large inclination well section during the lowering process. After excessive scraping, it will accumulate and cause the phenomenon of pressing the piston, resulting in resistance during the downhole drilling and difficulty in opening the pump. Even if the pump is slowly opened, the torque during reaming is extremely large, which is easy to stall the top drive or the rotary table. Since the torque during reaming is extremely large, one has to only pull out the drill string, resulting in difficulty in reaching the position of the metal falling object in the well, leading to fishing failure. Even after multiple hole cleaning operations, this problem still cannot be well solved, and there is still resistance during the downhole drilling, which prolongs the treatment time. Hole cleaning may also cause the falling object to be buried, increasing the fishing difficulty. Content of the Utility Model
[0008] The purpose of this section is to outline some aspects of the embodiments of the present utility model and briefly introduce some preferred embodiments. Some simplifications or omissions may be made in this section, as well as in the abstract and the title of the present application, and such simplifications or omissions shall not be used to limit the scope of the present utility model.
[0009] In view of the above and / or problems existing in the prior art, the present utility model is proposed.
[0010] The purpose of the present utility model is to overcome the problems existing in the prior art and provide a reaming semi-slope type strong magnetic fishing tool, which has high body strength, adds a reaming function, and improves the fishing efficiency and fishing effect.
[0011] To solve the above technical problems, a reaming semi-slope type strong magnetic fishing tool of the present utility model includes a body. The upper part of the body is a large end and is provided with a tapered female thread. Below the tapered female thread is a body central hole. The lower part of the body is a semi-cylinder. A groove is provided on the central plane of the semi-cylinder, and a plurality of strong magnets are embedded and fixed in the groove. A body connecting shaft extending downward is provided at the bottom of the semi-cylinder, and a single-cone bit is installed on the body connecting shaft.
[0012] As an improvement of the present utility model, a bit central water eye is provided along the axis of the single-cone bit. The upper end of the bit central water eye communicates with the lower end of the body water flow channel, and the upper end of the body water flow channel communicates with the body central hole.
[0013] As a further improvement of the present utility model, the body water flow channel includes a body inclined water eye, a body axial water eye, a body radial water eye, and a body connecting shaft central water eye that are connected in sequence. The upper end of the body inclined water eye communicates with the bit central water eye. The lower end of the body inclined water eye communicates with the upper end of the body axial water eye. The lower end of the body axial water eye communicates with the outer end of the body radial water eye. The inner end of the body radial water eye communicates with the upper end of the body connecting shaft central water eye. The lower end of the body connecting shaft central water eye communicates with the upper end of the bit central water eye.
[0014] As a further improvement of the present utility model, the strong magnets are fixed in the groove of the semi-cylinder by screws, and there are five pieces along the height direction. The outer end faces of the strong magnets are flush with the central plane of the semi-cylinder.
[0015] As a further improvement of the present utility model, a slope is provided at the bottom of the large end of the body, and the included angle between the slope and the central plane of the semi-cylinder is 120°.
[0016] As a further improvement of the present utility model, the lower part of the body is a 42CrMo semi-cylinder integrally connected thereto.
[0017] As a further improvement of the present utility model, the upper and lower ends of the single-cone bit are respectively supported on the body connecting shaft through thrust bearings, and skeleton oil seals are respectively arranged on both the upper and lower sides of the thrust bearings.
[0018] Compared with the prior art, the present utility model has achieved the following beneficial effects: the main structure strength of the present reaming semi-slope type strong magnetic fishing tool is increased, and it is combined with a single-cone bit to process the blocked formation, effectively improving the fishing efficiency, enhancing the fishing effect, avoiding the further deterioration of complex situations, shortening the construction period, and saving the drilling cost. BRIEF DESCRIPTION OF THE DRAWINGS
[0019] In order to more clearly illustrate the technical solutions of the embodiments of the present utility model, the following will briefly introduce the drawings required for the description of the embodiments. Obviously, the drawings in the following description are only some embodiments of the present utility model. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings. The drawings are only for reference and explanation, and are not used to limit the present utility model. Among them:
[0020] Figure 1 is a cross-sectional view of the reaming semi-slope type strong magnetic fishing tool of the present utility model;
[0021] Figure 2 is Figure 1 a partial enlarged view in
[0022] In the figure: 1. body; 1a. drill pipe female thread; 1b. body inclined water eye; 1c. body axial water eye; 1d. body radial water eye; 1e. body connecting shaft; 2. strong magnet; 3. single-cone bit; 4. compression screw; 5. bearing cover; 6. skeleton oil seal; 7. thrust bearing. DETAILED DESCRIPTION OF THE EMBODIMENTS
[0023] In the following description of the present utility model, the orientation or positional relationship indicated by the terms "upper", "lower", "front", "rear", "left", "right", "inner", "outer", etc. is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present utility model and simplifying the description, rather than indicating that the device must have a specific orientation.
[0024] In order to make the technical means, creative features, achieved purposes and effects of the present utility model easy to understand, the present utility model will be further described below with reference to specific illustrations. Obviously, the described embodiments are only a part of the embodiments of the present utility model, rather than all of the embodiments.
[0025] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by those of ordinary skill in the technical field to which this utility model pertains. The terms used herein in the description of this utility model are for the purpose of describing specific embodiments only and are not intended to limit this utility model.
[0026] As Figure 1 , Figure 2 shown, the reamer semi-slope high-intensity magnetic fishing tool of this utility model includes a body 1, a high-intensity magnet 2, and a single-cone bit 3. The upper end of the body 1 is provided with a drill pipe female thread 1a, which can be connected to the drill pipe. The lower part of the body 1 is the fishing part, made of 42CrMo ultra-high-strength steel, in the shape of a semi-cylinder and coaxial with the upper part of the body. A groove is provided on the central plane of the semi-cylinder, and multiple high-intensity magnets 2 are respectively fixed in the groove by screws. The body 1 has a transition zone, forming a 120° angle with the outer surface of the high-intensity magnet 2, and a fishing space is formed below the slope.
[0027] The bottom of the body is provided with a body connecting shaft 1e extending downward, and a single-cone bit 3 is installed on the body connecting shaft 1e. The upper and lower ends of the single-cone bit are respectively supported on the body connecting shaft 1e by thrust bearings 7, and skeleton oil seals 6 are respectively provided on the upper and lower sides of the thrust bearings 7. The outer edges of the bearing covers 5 are respectively fixed to the outer ports of the single-cone bit 3 by compression screws 4, and the inner end faces of the bearing covers 5 are respectively pressed against the outer sides of the inner rings of the thrust bearings 7.
[0028] The central water hole of the body connecting shaft 1e is in communication with the central water hole of the single-cone bit 3. The upper end of the central water hole of the body connecting shaft is in communication with the lower end of the body radial water hole 1d and the body axial water hole 1c. The body axial water hole 1c extends upward along the outer wall of the semi-cylinder, and the upper end communicates with the upper central hole of the body 1 through the body inclined water hole 1b. The body inclined water hole 1b, the body axial water hole 1c, the body radial water hole 1d, the central water hole of the body connecting shaft, and the central water hole of the single-cone bit form a water flow channel. The upper end of the water hole starts from the inner wall below the drill pipe female thread 1a, and the other end terminates at the bottom center of the single-cone bit 3, establishing a downhole circulation and forming a liquid flow impact force.
[0029] When the magnetic force of the high-intensity magnet 2 decreases or the single-cone bit 3 wears to the point where it cannot be used, both can be removed and replaced, without having to scrap the entire high-intensity magnetic fishing tool, reducing the tool cost.
[0030] When using this reamer semi-slope high-intensity magnetic fishing tool for fishing operations, first connect the upper end of the body 1 to the drill pipe and lower it into the well. When encountering resistance during lowering, the single-cone bit 3 reams through the blocked point. After reaching the bottom of the well, the drilling fluid sprays out from the bottom of the single-cone bit 3 through the water hole. Using the impact force of the liquid flow, the metal debris is flushed and floated up, fully adsorbed by the high-intensity magnet 2, and then lifted out of the well to complete the fishing operation.
[0031] A single-cone bit is added to the bottom of this semi-slope type high-intensity magnetic fishing tool. On the one hand, it avoids scraping and accumulation of soft mud cakes or cuttings beds, and at the same time enhances the ability to crush rocks, which is beneficial for reaming through when encountering resistance, improves the fishing efficiency, and shortens the drilling cycle. At the same time, the conventional rolling bearing structure of the single-cone bit palm is improved to a thrust bearing structure, increasing the bearing capacity of the bit and ensuring the stability and service life of the bit.
[0032] The fishing part at the lower part of the body is made of 42CrMo ultra-high-strength steel, and is improved to a semi-cylindrical shape with the same upper and lower radii, increasing the overall structural strength and being able to prevent being crushed. When encountering resistance, the fishing tool can be rotated, and the rotation speed ≤ 45 revolutions per minute, improving the reaming effect.
[0033] The included angle between the transition zone of the body and the outer surface of the strong magnet is 120°, which is larger than that of the conventional fishing tool, expanding the fishing space and being more conducive to the upward return of cuttings.
[0034] The above are only the preferred and feasible embodiments of the present utility model, showing and describing the basic principles, main features and advantages of the present utility model. The patent protection scope of the present utility model is not limited thereby. Those skilled in the art should understand that the present utility model is not limited by the above embodiments. Except for the above embodiments, without departing from the spirit and scope of the present utility model, the present utility model can also have other implementation manners. The present utility model will also have various changes and improvements. Any technical solutions formed by equivalent replacement or equivalent transformation fall within the protection scope required by the present utility model. The protection scope required by the present utility model is defined by the appended claims and their equivalents. The technical features not described in the present utility model can be realized by or adopted from the prior art, and will not be elaborated here.
Claims
1. A reamer semi-slope type strong magnetic fishing tool, comprising a body, the upper part of the body being a large end and provided with a tapered female thread, and a central hole of the body being provided below the tapered female thread, characterized in that: The lower part of the body is a semi-cylinder, and a groove is provided on the central plane of the semi-cylinder. A plurality of strong magnets are embedded and fixed in the groove; a body connecting shaft extending downward is provided at the bottom of the semi-cylinder, and a single-cone bit is installed on the body connecting shaft.
2. The eye - cutting semi - slope type strong magnetic fishing tool according to claim 1, wherein: A drill bit central water eye is provided along the axis of the single-cone bit. The upper end of the drill bit central water eye communicates with the lower end of the body water flow channel, and the upper end of the body water flow channel communicates with the body central hole.
3. The eye - cutting semi - slope type high - intensity magnetic fishing tool according to claim 2, wherein: The body water flow channel includes a body inclined water eye, a body axial water eye, a body radial water eye and a body connecting shaft central water eye that are connected in sequence. The upper end of the body inclined water eye communicates with the drill bit central water eye, the lower end of the body inclined water eye communicates with the upper end of the body axial water eye, the lower end of the body axial water eye communicates with the outer end of the body radial water eye, the inner end of the body radial water eye communicates with the upper end of the body connecting shaft central water eye, and the lower end of the body connecting shaft central water eye communicates with the upper end of the drill bit central water eye.
4. The eye-cutting semi-slope type high-intensity magnetic fishing tool according to claim 1, characterized in that: The strong magnets are fixed in the groove of the semi-cylinder by screws, and there are five pieces along the height direction. The outer end faces of the strong magnets are flush with the central plane of the semi-cylinder.
5. The eye-cutting semi-slope type high-intensity magnetic fishing tool according to claim 1, wherein: A slope is provided at the bottom of the large end of the body, and the included angle between the slope and the central plane of the semi-cylinder is 120°.
6. The eye - cutting semi - slope type strong magnetic fishing tool according to claim 1, characterized in that: The lower part of the body is a 42CrMo semi-cylinder integrated with it.
7. The eye - grooving semi - slope type high - intensity magnetic fishing tool according to any one of claims 1 to 6, characterized in that: The upper and lower ends of the single-cone bit are respectively supported on the body connecting shaft by thrust bearings, and skeleton oil seals are provided on both the upper and lower sides of the thrust bearings.