Underground fishing tool for oil pipe

Abstract

The utility model relates to an oil pipe underground fishing tool, which belongs to the technical field of fishing equipment and comprises an upper joint and a spear rod, two mounting inclined planes are arranged on the outer side wall of the spear rod, the two mounting inclined planes are connected with thread sliding blocks in a sliding manner, and a water flow channel is arranged in the spear rod. A first flow conveying channel and a second flow conveying channel are connected to the two sides of the end, away from the upper connector, of the water flow channel respectively, the end, away from the upper connector, of the first flow conveying channel and the end, away from the upper connector, of the second flow conveying channel are inclined flow channels, a protection plate is fixed to the upper end of the thread sliding block, and a hemispherical groove is formed in the position, corresponding to a water outlet hole of the inclined flow channel, of the protection plate. The end portions of the ends, away from the upper connector, of the first flow conveying channel and the second flow conveying channel are the inclined flow channels parallel to the corresponding installation inclined faces, liquid can be sprayed out in the direction of the installation inclined faces, the thread sliding block is better pushed, the protection plate can effectively resist scouring erosion of water flow, the thread sliding block is better protected, and due to the arrangement of the grooves, the service life of the thread sliding block is prolonged. Dispersion of impact water flow can be reduced, and thrust of the loose tooth block is guaranteed.

Description

TECHNICAL FIELD

[0001] The utility model relates to a kind of oil pipe downhole fishing tool, belong to fishing equipment technical field. BACKGROUND

[0002] In drilling and workover operations, various complex situations can cause drilling tools to fall into the well as "fish", requiring the use of fishing tools for fishing operations. Although the traditional sliding block spear is simple in structure and easy to maintain, it has many problems in actual application. In actual application, affected by the complex environment in the oil well, such as silt, viscous liquid, and factors such as horizontal well without gravity assistance, the sliding block is difficult to descend, resulting in a low success rate of fishing. Some fishing tools now have a water flow channel in the fishing rod that extends to the end of the bevel, and high-pressure water is injected into the drill pipe, which is then sprayed from the water flow channel onto the sliding block, pushing the sliding block to slide. However, the outlet of the current water flow channel is perpendicular to the sliding block, causing the pushing force to have an angle with the direction of the sliding block, affecting the pushing of the sliding block. Moreover, the high-pressure water sprayed from the water flow channel directly impacts the sliding block, and the contact surface between the sliding block and the water outlet is easily eroded by the water flow, reducing the service life of the tool. SUMMARY

[0003] The utility model provides a kind of oil pipe downhole fishing tool, solve the problems in the above background technique.

[0004] The utility model relates to a kind of oil pipe downhole fishing tool, including upper joint and spear rod, two installation inclines are equipped on the outside wall of spear rod, two installation inclines are slidably connected with sliding tooth block, water flow channel is equipped in spear rod, the both sides of the end of water flow channel far from upper joint are respectively connected with flow channel one and flow channel two, flow channel one and flow channel two far from the end of upper joint are respectively extended to the upper end surface of installation incline, the end of flow channel one and flow channel two far from upper joint is the inclined flow channel parallel with corresponding installation incline, the upper end of sliding tooth block is fixed with protection plate, the recess is set in the water outlet hole of protection plate and inclined flow channel, and the recess is hemispherical.

[0005] As a preferred, the lower end of installation incline is equipped with limit block to prevent sliding tooth block from falling out.

[0006] As a preferred, the inner wall of flow channel one is equipped with multiple turbulence protrusions along its axial direction, and the multiple turbulence protrusions are arranged in a spiral shape. When high-pressure water flows through, the turbulence protrusions cause the water flow to form a complex turbulence state, increasing the turbulence degree of the water flow, preventing the formation of a low-flow boundary layer near the pipe wall, and improving the overall energy transfer efficiency of the water flow, thereby more effectively pushing the sliding block.

[0007] As a preferred, the radial height of the multiple turbulence protrusions is not equal.

[0008] As a kind of preferred, the protection plate inside the recess is provided with upper convex water retaining platform, the setting of upper convex water retaining platform can reduce water flow to inside, impact installation slope, the outside of recess is provided with multiple scattering arrangement guide groove, guide groove design makes that high-pressure water flow can guide water flow to outside evenly dispersed when impacting recess, avoid water flow concentration in a point, enhance the uniformity of water flow to the action of slider, make the pushing force of slider more stable.

[0009] As a kind of preferred, the protection plate is fixed with positioning column close to the side of sliding tooth block, sliding tooth block is provided with positioning hole matched with positioning column, and the protection plate is positioned and installed conveniently and quickly.

[0010] As a kind of preferred, the support ring is fixed on the outer wall of the one end of the lance close to the upper joint, a plurality of guide sleeves are fixed in circular array on the outer wall of the support ring, a spring is fixed on the bottom of the inner hole of the guide sleeve, a telescopic guide rod is fixed on the outer end of the spring, and a rolling ball is installed on the outer end of the telescopic guide rod, so that the lance can be better kept in a good central state in the wellbore, and collision and friction between the lance and the wellbore wall are prevented, the damage risk of the wellbore wall and the lance itself is reduced, and the telescopic guide rod can be telescoped without affecting the extension of the lance into the inner hole of the fished object.

[0011] As a kind of preferred, the support ring is composed of two semicircular rings, a connecting flange is arranged at the connecting position of the two semicircular rings, and a connecting bolt is fixed on the connecting flange, so that the support ring can be conveniently installed and fixed.

[0012] As a kind of preferred, a fixed cover is threadedly installed on the outer end of the guide sleeve, the outer end of the telescopic guide rod passes through the fixed cover, the outer end of the telescopic guide rod is provided with a rolling ball groove for rolling of the rolling ball, a blocking plate is fixed on the outer end of the telescopic guide rod, a through hole is arranged on the blocking plate for the outer end of the rolling ball to pass out, a guide groove is arranged on the inner side wall of the upper part of the guide sleeve, and a guide boss is arranged on the outer side wall of the telescopic guide rod and matched with the guide groove, so that the telescopic guide rod can be conveniently installed.

[0013] The utility model has the following beneficial effects:

[0014] The end of the flow channel one and the flow channel two away from the upper joint one is an inclined flow channel parallel to the corresponding installation slope, liquid can be sprayed in the direction of the installation slope, the sliding tooth block is better pushed, the protection plate can effectively resist the erosion of water flow, the sliding tooth block is better protected, and the recess is arranged to reduce the dispersion of impact water flow and ensure the pushing force of the sliding tooth block. BRIEF DESCRIPTION OF DRAWINGS

[0015] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the following will briefly introduce the drawings needed in the description of the embodiments or the prior art. Obviously, the drawings described below are only exemplary, and for those skilled in the art, other drawings can be derived from the provided drawings without creative labor.

[0016] The structures, proportions, sizes, etc. disclosed in the specification are only used to cooperate with the content disclosed in the specification, for understanding and reading by those skilled in the art, and are not used to limit the limiting conditions that can be implemented by the present application, so they do not have technical substantive significance. Any modification of structure, change of proportion relationship or adjustment of size, without affecting the effects and purposes that can be achieved by the present application, should still fall within the scope of the technical content disclosed by the present application.

[0017] Figure 1 It is a front view structural schematic diagram of the present application;

[0018] Figure 2 It is Figure 1 It is an enlarged structural schematic diagram of A in the middle;

[0019] Figure 3 It is a side view structural schematic diagram of the protective plate;

[0020] Figure 4 It is a front view structural schematic diagram of the installation of the support ring;

[0021] Figure 5 It is a side view structural schematic diagram of the support ring;

[0022] In the figure: 1, upper joint; 2, spear; 3, water flow channel; 4, flow channel one; 5, flow channel two; 6, sliding block; 7, limiting block; 8, protective plate; 9, installation inclined surface; 10, groove; 11, turbulence protrusion; 12, flow guide groove; 13, positioning column; 14, upper convex water retaining platform; 15, support ring; 16, guide sleeve; 17, rolling ball; 18, guide boss; 19, spring; 20, telescopic guide rod; 21, fixed cover. DETAILED DESCRIPTION

[0023] The technical solutions in the embodiments of the present application will be described clearly and completely in combination with the drawings in the embodiments of the present application. Obviously, the described embodiments are only a part of the embodiments of the present application, not all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor fall within the scope of the present application.

[0024] Embodiment one, such as Figures 1 to 5The utility model discloses a kind of oil pipe downhole fishing tools, including upper joint 1 and lance 2, two installation inclines 9 are equipped on the outer side wall of lance 2, two installation inclines 9 are slidably connected with sliding tooth block 6, sliding tooth block 6 slides along installation incline 9, water flow passage 3 is equipped in lance 2, water flow passage 3 is connected with flow channel one 4 and flow channel two 5 respectively at both sides of end portion far from upper joint 1 one end, flow channel one 4 and flow channel two 5 are extended to the upper end surface of installation incline 9 respectively far from upper joint 1 one end, the end portion far from upper joint 1 one end of flow channel one 4 and flow channel two 5 is the inclined flow channel parallel with corresponding installation incline 9, the upper end of sliding tooth block 6 is fixed with guard plate 8, the water outlet hole of guard plate 8 and inclined flow channel is set recess 10 at corresponding place, recess 10 is hemispherical.

[0025] Before carrying out fishing operation, check whether sliding tooth block 6 can normally slide, whether water flow passage 3, flow channel one 4 and flow channel two 5 are unobstructed.Connect upper joint 1 to drill rod, lower to well, lance 2 lower end is inserted into fish inner hole, then ground equipment injects high pressure water into drill rod, then high pressure water enters flow channel one 4 and flow channel two 5 from water flow passage 3, then is sprayed at recess 10 at inclined flow channel, impact recess 10 on sliding tooth block 6, sliding tooth block 6 is pushed along installation incline 9 and slides, realizes the capture of fish, then raises drill rod, completes fishing operation.

[0026] In the embodiment two, on the basis of the embodiment one, the lower end of installation incline 9 is equipped with limiting block 7 for preventing sliding tooth block 6 from falling out. The surface of recess 10 is sprayed with tungsten carbide coating. Guard plate 8 is made of ceramic-metal composite material, the ceramic layer faces the water flow direction, has high hardness and good wear resistance, can effectively resist the erosion of water flow; the metal layer is welded and fixed with sliding tooth block 6, to ensure the firm installation of guard plate 8.

[0027] A plurality of flow-disturbing protrusions 11 are arranged on the inner wall of flow channel one 4 along the axial direction thereof, and the plurality of flow-disturbing protrusions 11 are arranged in a helical manner.

[0028] The heights of the plurality of flow-disturbing protrusions 11 in the radial direction are not equal.

[0029] The upper convex water-blocking platform 14 is arranged on the guard plate 8 inside the recess 10, and a plurality of scattering flow guide grooves 12 are arranged on the outer side of the recess 10. When the water flow impacts the recess 10, the water inside the recess 10 is blocked by the upper convex water-blocking platform 14, which better prevents the impact on the lance 2, and the water outside the recess 10 is guided out by the flow guide grooves 12 for dispersion.

[0030] The positioning column 13 is fixed to the side of the guard plate 8 close to the sliding tooth block 6, and the positioning hole is arranged on the sliding tooth block 6 and matched with the positioning column 13. When the guard plate 8 is installed, the positioning column 13 and the positioning hole can be used for rapid positioning and installation.

[0031] The lance 2 is fixed with a support ring 15 on the outer side wall of the end close to the upper joint 1, a plurality of guide sleeves 16 are fixed in a circular array on the outer side wall of the support ring 15, a spring 19 is fixed on the bottom of the inner hole of the guide sleeve 16, an outer end of the spring 19 is fixed with a telescopic guide rod 20, and the outer end of the telescopic guide rod 20 is installed with a rolling ball 17.

[0032] The support ring 15 is composed of two half circular rings, and a connecting flange is arranged at the connecting position of the two half circular rings, and a connecting bolt is fixed on the connecting flange.

[0033] The outer end of the guide sleeve 16 is installed with a fixed cover 21 in a threaded mode, the outer end of the telescopic guide rod 20 penetrates through the fixed cover 21, the outer end of the telescopic guide rod 20 is provided with a rolling ball groove for rolling of the rolling ball 17, the outer end of the telescopic guide rod 20 is fixed with a blocking plate, the blocking plate is provided with a through hole for the outer end of the rolling ball 17 to penetrate out, a guide groove is arranged on the inner side wall of the upper portion of the guide sleeve 16, and a guide boss 18 is arranged on the outer side wall of the telescopic guide rod 20 and matched with the guide groove. When the lance 2 is lowered into the well, the telescopic guide rod 20 will be telescoped outward under the action of the spring 19, the rolling ball 17 will be abutted against the inner wall of the well, the lance 2 is lowered into the well, and the rolling ball 17 will roll along the inner wall of the well to centrally guide the lance 2.

[0034] After the fishing operation is completed, the lance 2 is taken out of the well. Whether the sliding tooth block 6 is damaged is checked, if damaged, it is replaced in time. The wear condition of the tungsten carbide coating on the surface of the matching groove 10 is observed, if the wear is serious, the groove 10 is re-sprayed. Whether the sliding tooth block 6 is flexible is checked, if there is a jam, it is debugged to ensure that the fishing lance is in a good working state and is prepared for the next fishing operation.

[0035] In addition, it should be understood that although the present specification is described in terms of embodiments, not every embodiment contains only one independent technical solution, and the description of the specification is only for the sake of clarity, and those skilled in the art should consider the specification as a whole, and the technical solutions in each embodiment can be appropriately combined to form other embodiments that those skilled in the art can understand.

[0036] In the description of the present application, the directions or position relationships indicated by the terms "inner", "outer", "longitudinal", "transverse", "upper", "lower", "top", "bottom" and the like are based on the directions or position relationships shown in the drawings, and are only for the convenience of describing the present application and not for the requirement that the present application must be constructed and operated in a particular direction, therefore it cannot be understood as a limitation on the present application.

Claims

1. A tubing downhole fishing tool, comprising an upper joint (1) and a spear shaft (2), two installation inclined surfaces (9) are arranged on the outer side wall of the spear shaft (2), a sliding jaw block (6) is slidably connected on each of the two installation inclined surfaces (9), and a water flow channel (3) is arranged in the spear shaft (2), characterized in that: The water flow channel (3) is connected with a flow channel one (4) and a flow channel two (5) at both sides of the end away from the upper joint (1), the flow channel one (4) and the flow channel two (5) extend to the upper end surface of the installation slope (9) away from the upper joint (1), the end of the flow channel one (4) and the flow channel two (5) away from the upper joint (1) is an inclined flow channel parallel to the corresponding installation slope (9), the upper end of the sliding block (6) is fixed with a protective plate (8), the protective plate (8) is provided with a groove (10) corresponding to the water outlet hole of the inclined flow channel, and the groove (10) is in a semispherical shape.

2. A tubing downhole fishing tool according to claim 1, characterized in that: The lower end of the installation slope (9) is provided with a limiting block (7) for preventing the sliding block (6) from falling out.

3. A tubing downhole fishing tool according to claim 2, characterized in that: A plurality of turbulence protrusions (11) are arranged on the inner wall of the flow channel one (4) in the axial direction.

4. A tubing downhole fishing tool according to claim 3, characterized in that: The heights of the plurality of turbulence protrusions (11) in the radial direction are not equal.

5. The tubing downhole fishing tool of claim 1, wherein: The protective plate (8) on the inner side of the groove (10) is provided with an upper convex water retaining platform (14), and the outer side of the groove (10) is provided with a plurality of scatteringly arranged flow guide grooves (12).

6. A tubing downhole fishing tool as defined in claim 1, wherein: The protective plate (8) is fixed with a positioning column (13) close to the side of the sliding block (6), and the sliding block (6) is provided with a positioning hole matched with the positioning column (13).

7. A tubing downhole fishing tool as defined in claim 1, wherein: The lance (2) is fixed with a support ring (15) on the outer side wall close to the upper joint (1), a plurality of guide sleeves (16) are fixed in a circular array on the outer side wall of the support ring (15), a spring (19) is fixed on the inner hole bottom of the guide sleeve (16), the outer end of the spring (19) is fixed with a telescopic guide rod (20), and the outer end of the telescopic guide rod (20) is provided with a rolling ball (17).

8. A tubing downhole fishing tool according to claim 6, characterized in that: The support ring (15) is composed of two semicircular rings, and the connecting part of the two semicircular rings is provided with a connecting flange, and the connecting flange is fixed with a connecting bolt.

9. A tubing downhole fishing tool as defined in claim 6, wherein: The outer end of the guide sleeve (16) is screwed with a fixed cover (21), the outer end of the telescopic guide rod (20) penetrates through the fixed cover (21), the outer end of the telescopic guide rod (20) is provided with a rolling ball groove for rolling of the rolling ball (17), the outer end of the telescopic guide rod (20) is fixed with a blocking plate, the blocking plate is provided with a perforation for the outer end of the rolling ball (17) to penetrate out, the upper inner side wall of the guide sleeve (16) is provided with a guide groove, and the outer side wall of the telescopic guide rod (20) is provided with a guide boss (18) matched with the guide groove.

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