Efficient super-long guide rod strong magnetic milling shoe

Abstract

The utility model discloses an efficient super-long guide rod strong magnetic milling shoe which comprises a milling shoe body, the interior of the milling shoe body is hollow, a plurality of chip removal through grooves are evenly distributed in the side face of the milling shoe body in the circumferential direction, water outlet holes are formed in the bottom faces of the chip removal through grooves, and cutting teeth are fixed to the outer side wall of the milling shoe body. The interior of the guiding rod is hollow, one end of the guiding rod is fixed and communicated with the milling shoe body, a plurality of first drainage grooves are evenly distributed in the side face of the guiding rod in the circumferential direction, the upper centralizing rod is fixed and communicated with one end of the guiding rod, and a plurality of second drainage grooves are evenly distributed in the side wall of the upper centralizing rod in the circumferential direction; the multiple magnets are circumferentially and evenly distributed on the end face of the end, close to the milling shoe body, of the upper centralizing rod. The magnet is embedded in the end face, close to the guide rod, of the upper centralizing rod, so that milling scrap iron can be effectively adsorbed, and the guide rod and a milling shoe are prevented from being blocked due to sinking of the milling scrap iron.

Description

Technical Field

[0001] The utility model belongs to the field of drilling equipment, and relates to a workover tool, in particular to a high-efficiency ultra-long extension rod strong magnetic mill shoe. Background Technique

[0002] At present, in conventional milling and releasing stuck operations, external milling and over-milling methods are mostly used. Especially for various permanent packers currently in use, sometimes even the entire outer sleeve or outer cylinder needs to be milled and over-milled. However, for some wells with a long production cycle and a long tool running time in the well, the packers in the wellbore do not have the condition for over-milling the outer sleeve. The over-milling operation is time-consuming and laborious, and the operation risk is high during treatment. For this type of downhole tool structure, an extension rod mill shoe is used to mill the inner hole, damage the slip mandrel, and release the slip jam. The milling amount is small, which can effectively release the stuck and improve the operation efficiency.

[0003] However, limited by the processing length of the tool, the processing length of the inner hole of the conventional extension rod can only reach 600 mm. Secondly, affected by the inner hole water eye, the displacement is low, and the chip backflow effect of the milled chips is not good. The water with chips returns to the upper joint. Due to the change of flow velocity and flow direction, the chips are easy to precipitate and cause the extension rod to be jammed, resulting in the tool being buried and stuck.

[0004] Therefore, how to provide a high-efficiency ultra-long extension rod strong magnetic mill shoe to overcome the above problems is an urgent problem to be solved by those skilled in the art. Content of the Utility Model

[0005] In view of this, the utility model provides a high-efficiency ultra-long extension rod strong magnetic mill shoe, which solves the problem of extension rod jamming caused by chip precipitation.

[0006] In order to achieve the above purpose, the utility model adopts the following technical scheme:

[0007] A high-efficiency ultra-long extension rod strong magnetic mill shoe, comprising:

[0008] A mill shoe body, which is a composite body composed of two frustums with opposite bottom surfaces and a cylinder located between the bottom surfaces of the two frustums. The mill shoe body is hollow inside and is provided with chip discharge grooves axially arranged on its outer side surface. The chip discharge grooves are multiple and evenly distributed on the outer side wall of the mill shoe body. One side of the chip discharge groove is open and a water outlet hole communicating with the inside of the mill shoe body is arranged on its bottom surface. Cutting teeth are fixed on the outer side wall of the mill shoe body and close to the outer end face of the side wall of the chip discharge groove.

[0009] An extension rod, which is hollow inside and one end of which is fixed to the mill shoe body and the interiors of the two are communicated. A plurality of drainage grooves I are evenly distributed circumferentially on the side surface of the extension rod, and the drainage grooves I correspond to the positions of the chip discharge grooves.

[0010] The upper centralizer rod, the upper centralizer rod is a composite body composed of two cylindrical sections with different diameters, the inside of the upper centralizer rod is hollow and its large-diameter end is fixed to and internally connected with one end of the extension rod away from the mill shoe body, and a connecting thread is arranged inside the small-diameter end. A plurality of drainage grooves II with openings at both end faces and one side face are circumferentially and evenly distributed on the side wall of the large-diameter section of the upper centralizer rod;

[0011] Magnets, a plurality of magnets are arranged and circumferentially and evenly distributed on the end face of the upper centralizer rod close to the mill shoe body, and the number of the magnets is the same as that of the drainage grooves II and the positions correspond to each other.

[0012] Through the above technical solutions, compared with the prior art, the present invention discloses and provides a high-efficiency ultra-long extension rod strong magnetic mill shoe. In the mill shoe of the present invention, magnets are embedded on the end face of the upper centralizer rod close to the extension rod, and this setting can effectively adsorb the milled iron chips and prevent the extension rod and the mill shoe from being blocked due to the sinking of the milled chips.

[0013] Preferably, the taper of the end of the mill shoe body away from the extension rod is 1:1.6. This setting enables the mill shoe to be smoothly introduced into the wellbore.

[0014] Preferably, hard alloy blocks are welded on the end face of the mill shoe body away from the extension rod. This setting can ensure that the mill shoe can timely clean the blocking debris at the front end and ensure the normal introduction of the mill shoe.

[0015] Preferably, the maximum outer diameter of the mill shoe body is greater than the outer diameter of the extension rod and less than the minimum outer diameter of the upper centralizer rod. This setting can ensure that the mill shoe can be smoothly introduced into the wellbore.

[0016] Preferably, the extension rod is made by the process of drilling a whole round steel and its length range is 800mm - 1600mm. This setting can effectively increase the depth of the mill shoe's downward exploration.

[0017] Preferably, a plurality of trapezoidal grooves are radially opened on the end face of the upper centralizer rod close to the mill shoe body, and one end of the trapezoidal groove away from the axis of the upper centralizer rod is communicated with the drainage groove II. This setting can ensure that the sewage with debris can effectively flow out from the upper centralizer rod.

[0018] Preferably, the magnets are high-temperature strong magnets with a temperature resistance of up to 180°C and a magnetic property of 4000 - 4500 gauss, and their cross-section is trapezoidal and adapted to the trapezoidal groove. This setting can ensure that the magnets can still strongly adsorb the debris in a high-temperature environment.

[0019] Through the above technical solutions, compared with the prior art, the present invention discloses and provides a high-efficiency ultra-long extension rod strong magnetic mill shoe. The following technical effects can be achieved:

[0020] In the present utility model, the mill shoe fixes the mill shoe body to an extremely long extension rod, and an upper centralizer is fixed to the end of the extension rod away from the mill shoe body. This setting enables the mill shoe to be applied under the condition that the packer in the wellbore does not have the condition of outer milling. Moreover, due to the extremely long extension rod, the mill shoe body can further penetrate into the wellbore, increasing the application range of the mill shoe, saving time, and having a low operation risk during work. A high-temperature resistant strong magnet is embedded in the end face of the upper centralizer close to the extension rod. This setting enables the magnet to effectively adsorb the milled iron chips, preventing the extension rod and the mill shoe from being blocked due to the sinking of the milled debris. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] In order to more clearly illustrate the technical solutions in the embodiments of the present utility model or the prior art, the following will briefly introduce the drawings required for use in the description of the embodiments or the prior art. Obviously, the drawings described below are only the 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 the provided drawings.

[0022] Figure 1 is an overall axonometric view of a high-efficiency extremely long extension rod strong magnetic mill shoe;

[0023] Figure 2 is a front view of a high-efficiency extremely long extension rod strong magnetic mill shoe;

[0024] Figure 3 is a side view of a high-efficiency extremely long extension rod strong magnetic mill shoe;

[0025] Figure 4 is Figure 3 a sectional view taken along the A-A direction in

[0026] In the figure:

[0027] 1 is the mill shoe body, 10 is the chip removal groove, 11 is the water outlet hole, 12 is the cutting tooth, 13 is the cemented carbide block, 2 is the extension rod, 20 is the first drainage groove, 3 is the upper centralizer, 30 is the connecting thread, 31 is the second drainage groove, 32 is the trapezoidal groove, and 4 is the magnet. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0028] The following will clearly and completely describe the technical solutions in the embodiments of the present utility model. Obviously, the described embodiments are only a part of the embodiments of the present utility model, rather than all of them. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative efforts belong to the scope of protection of the present utility model.

[0029] In the present utility model, the mill shoe fixes the mill shoe body 1 to the ultra-long guide bar 2, and a top centralizer 3 is fixed to the end of the guide bar 2 away from the mill shoe body 1. This setting enables the mill shoe to be applied under the condition that the packer in the wellbore does not have the condition of external milling. And due to the ultra-long guide bar 2, the mill shoe body 1 can further penetrate into the wellbore, increasing the application range of the mill shoe, saving time, and having a low operation risk during work. On the end face of the top centralizer 3 close to the guide bar 2, a high-temperature resistant strong magnet 4 is embedded. This setting enables the magnet 4 to effectively adsorb the milled iron chips, preventing the guide bar 2 and the mill shoe from being blocked due to the sinking of the milled debris.

[0030] Embodiment

[0031] See Appendix Figures 1-4 It is a schematic diagram of the overall and partial structures of an embodiment of the present utility model. The present utility model specifically discloses a high-efficiency ultra-long guide bar strong magnetic mill shoe, including:

[0032] The mill shoe body 1 is a composite body composed of two frustums with opposite bottom surfaces and a cylinder located between the bottom surfaces of the two frustums. The mill shoe body 1 is hollow inside, and chip removal through grooves 10 are arranged axially on its outer side surface. There are multiple chip removal through grooves 10, which are evenly distributed on the outer side wall of the mill shoe body 1. One side of the chip removal through groove 10 is open, and a water outlet hole 11 communicating with the inside of the mill shoe body 1 is opened on its bottom surface. Cutting teeth 12 are fixed on the outer side wall of the mill shoe body 1 and near the outer end face of the side wall of the chip removal through groove 10.

[0033] The guide bar 2 is hollow inside, and one end of it is fixed to the mill shoe body 1 and their interiors are communicated. Multiple drainage grooves one 20 are evenly distributed circumferentially on the side surface of the guide bar 2. The drainage grooves one 20 correspond to the positions of the chip removal through grooves 10.

[0034] The top centralizer 3 is a composite body composed of two cylindrical sections with different diameters. The top centralizer 3 is hollow inside, and its large-diameter end is fixed to the end of the guide bar 2 away from the mill shoe body 1 and their interiors are communicated. A connecting thread 30 is arranged inside the small-diameter end. Multiple drainage grooves two 31 with both end faces and one side face open are evenly distributed circumferentially on the side wall of the large-diameter section of the top centralizer 3.

[0035] The magnets 4 are provided in multiple numbers and are evenly distributed circumferentially on the end face of the top centralizer 3 close to the mill shoe body 1. The number of the magnets 4 is the same as that of the drainage grooves two 31 and their positions correspond.

[0036] More specifically, the taper of the end of the mill shoe body 1 away from the guide bar 2 is 1:1.6.

[0037] More specifically, a hard alloy block 13 is welded on the end face of the mill shoe body 1 away from the guide bar 2.

[0038] More specifically, the maximum outer diameter of the mill shoe body 1 is greater than the outer diameter of the extension rod 2 and less than the minimum outer diameter of the upper centralizer 3.

[0039] More specifically, the extension rod 2 is made by the process of drilling a solid round steel bar, and its length ranges from 800 mm to 1600 mm.

[0040] More specifically, at one end face of the upper centralizer 3 close to the mill shoe body 1, a plurality of trapezoidal grooves 32 are radially formed. One end of the trapezoidal groove 32 far from the axis of the upper centralizer 3 is communicated with the second drainage groove 31.

[0041] More specifically, the magnet 4 is a high-temperature strong magnet 4 with a temperature resistance of up to 180 °C and a magnetism of 4000 - 4500 Gauss, and its cross-section is trapezoidal and adapted to the trapezoidal groove 32.

[0042] The using method of the high-efficiency and extra-long extension rod strong magnetic mill shoe:

[0043] In the present utility model, the extra-long extension rod 2 strong magnetic mill shoe is threadedly connected with the drill string through the upper centralizer 3. Before lowering it into the well, it is first necessary to accurately measure the dimensions of each part of the extra-long extension rod 2 strong magnetic mill shoe; extend the mill shoe into the wellbore and slowly lower it to the predetermined depth; when the end face of the mill shoe body 1 far from the extension rod 2 touches the upper end face of the packer inside the pipe string, it can be observed that the weight indicator changes. At this time, slowly start the rotary table for driving the mill shoe to rotate, and the weight changes, indicating that the mill shoe has been successfully introduced; continue to lower the mill shoe. If there is resistance or jamming, the weight indicator will show a change in weight. Take a low-pressure downward milling, combined with the measured downward distance of the mill shoe. When the downward distance of the mill shoe is equal to the depth of the lower slip of the packer from its upper end face, and at the same time, observe the change in weight, indicating that the packer is unsealed. After milling is completed, check the downward distance of the mill shoe. During milling, periodically lift and lower the drill string, and use the mud pump to circulate and flush the wellbore with a large displacement to make the debris return upward in time and be adsorbed by the magnet 4 fishing body. Check the milling effect. After milling is completed, lift and lower to check whether there is resistance or jamming in the pipe string and whether the lowering depth is consistent.

[0044] In this specification, each embodiment is described in a progressive manner. The key point of each embodiment is to illustrate the differences from other embodiments. The same or similar parts among the embodiments can be referred to each other.

[0045] The above description of the disclosed embodiments enables those skilled in the art to implement or use the present utility model. Various modifications to these embodiments will be obvious to those skilled in the art. The general principles defined herein can be implemented in other embodiments without departing from the spirit or scope of the present utility model. Therefore, the present utility model will not be limited to these embodiments shown herein, but will be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. An efficient super-long extension bar high-intensity magnetic mill shoe, characterized in that, Comprising: A mill shoe body (1), the mill shoe body (1) being a composite body composed of two frustums with opposite bottom surfaces and a cylinder located between the bottom surfaces of the two frustums. The inside of the mill shoe body (1) is hollow, and chip discharge through grooves (10) are arranged along its axial direction on its outer side surface. The chip discharge through grooves (10) are multiple and evenly distributed on the outer side wall of the mill shoe body (1). One side of the chip discharge through groove (10) is open, and a water outlet hole (11) communicating with the inside of the mill shoe body (1) is provided at its bottom surface. Cutting teeth (12) are fixed on the outer side wall of the mill shoe body (1) and near the outer end face of the side wall of the chip discharge through groove (10). A guiding rod (2), the inside of the guiding rod (2) being hollow, and one end of it being fixed to the mill shoe body (1) and their interiors being communicated. A plurality of first drainage grooves (20) are evenly distributed circumferentially on the side surface of the guiding rod (2), and the first drainage grooves (20) correspond to the positions of the chip discharge through grooves (10). An upper centralizer (3), the upper centralizer (3) being a composite body composed of two cylindrical segments with different diameters. The inside of the upper centralizer (3) is hollow, and its large-diameter end is fixed to and internally communicated with the end of the guiding rod (2) away from the mill shoe body (1). A connecting thread (30) is provided inside the small-diameter end. A plurality of second drainage grooves (31) with openings at both end faces and one side face are evenly distributed circumferentially on the side wall of the large-diameter section of the upper centralizer (3). Magnets (4), a plurality of magnets (4) being circumferentially evenly distributed on the end face of the upper centralizer (3) close to the mill shoe body (1), and the number of the magnets (4) being the same as and corresponding to the positions of the second drainage grooves (31).

2. The high-efficiency extra-long extension bar strong magnetic mill shoe according to claim 1, characterized in that The taper of the end of the mill shoe body (1) away from the guiding rod (2) is 1:1.

6.

3. An efficient ultra-long extension bar strong magnetic mill shoe according to claim 1, characterized in that, A hard alloy block (13) is surfacing-welded on the end face of the mill shoe body (1) away from the guiding rod (2).

4. An efficient extra-long extension bar high-intensity magnetic mill shoe according to claim 1, characterized in that, The maximum outer diameter of the mill shoe body (1) is greater than the outer diameter of the guiding rod (2) and less than the minimum outer diameter of the upper centralizer (3).

5. An efficient ultra-long extension bar strong magnetic mill shoe according to claim 1, characterized in that, The guiding rod (2) is made by the process of drilling a whole round steel, and its length ranges from 800 mm to 1600 mm.

6. The high-efficiency extra-long extension bar high-strength magnetic mill shoe according to claim 1, wherein A plurality of trapezoidal grooves (32) are radially opened on the end face of the upper centralizer (3) close to the mill shoe body (1), and the end of the trapezoidal groove (32) away from the axis of the upper centralizer (3) is communicated with the second drainage groove (31).

7. An efficient ultra-long extension bar high-strength magnetic mill shoe according to claim 6, characterized in that, The magnet (4) is a high-temperature type strong magnet (4) with a temperature resistance up to 180 °C and a magnetism of 4000 - 4500 gauss, and its cross-section is trapezoidal and adapted to the trapezoidal groove (32).

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