Drill rod fishing tool

Abstract

The utility model belongs to the technical field of drilling equipment maintenance, and particularly provides a drill rod fishing tool which comprises a connecting rod and an internal expansion fishing head, a first pipe cavity penetrating up and down is formed in the connecting rod, a telescopic rod is installed in the first pipe cavity in a sliding mode, and the internal expansion fishing head is assembled at the lower end of the telescopic rod. The first pipe cavity is a variable-diameter pipe cavity, the upper end and the lower end of the variable-diameter pipe cavity are a wide section and a narrow section respectively, a variable-diameter section used for limiting is arranged at the top end of the telescopic rod, the internal expansion fishing head is arranged in the narrow section, and the inner diameter and the length of the narrow section are matched with the maximum outer diameter and the maximum length of the internal expansion fishing head. The outer diameter of the main body part of the telescopic rod is matched with the inner diameter of the narrow section; the tapping device further comprises an assembling kit and a tapping kit. The internal expansion fishing head takes an abrasive material as a medium and is matched with the clamping jaw to realize a high-stability internal expansion clamping effect; and the dual connection mode can provide sufficient stability redundancy, the fishing success rate is guaranteed, and the situation that idle stroke wastes time is avoided.

Description

TECHNICAL FIELD

[0001] The utility model belongs to the technical field of drilling equipment maintenance, and particularly provides a drill rod fishing tool. BACKGROUND

[0002] In the drilling construction process, the phenomenon of drill rod fracture may be caused by reasons such as sticking, burying, burning and poor state of drill rod, and the fractured drill rod remaining in the borehole will lead to the abandonment of the borehole. The loss caused by the abandonment of the borehole is very serious. Drill rod fishing is a general remedial measure for drill rod fracture problems.

[0003] At present, according to the drilling operation scene requirements, the drill rod fisher mainly has a male taper, a female taper, a sliding block slip fishing spear, a fishing barrel, a reverse circulation fishing basket and a strong magnetic fisher, wherein the reverse circulation fishing basket and the strong magnetic fisher are generally used for fishing small volume fractured blocks of the drill rod, and the male taper, the female taper, the sliding block slip fishing spear and the fishing barrel are used for fishing the whole fractured drill rod.

[0004] Considering that the drill rod fracture position is usually located at the middle and lower positions of the borehole, there is a certain distance between the fracture point of the drill rod and the sticking point of the drill bit, that is, there is more than one section of drill rod between the two points, and the drill rod is generally split and fished out section by section during the fishing operation, and the deeper the position of the drill rod, the higher the required connection strength between the fishing tool and the drill rod. The higher the connection strength of the fishing tool, the longer the connection operation difficulty and the single operation time, and considering the work efficiency, a spear type device is usually used to complete the fishing work of the shallow drill rod, and a tapping device is replaced to complete the fishing work of the deep drill rod after the fishing work of the shallow drill rod is completed.

[0005] However, in the actual construction process, it is difficult to clearly define the concept of deep and shallow layers, and only according to experience, the tapping device is directly replaced when the fishing work reaches a certain depth, which leads to a significant decrease in the work efficiency of the middle and deep drill rod fishing.

[0006] In addition, when fishing the deep drill rod or the drill rod directly connected with the drill bit, it may be difficult to complete the fishing work only by relying on the connection strength of the tapping device, and the connection strength of the tapping device will be greatly reduced after completing a tapping operation and the decoupling phenomenon occurs during the lifting process. UTILITY MODEL CONTENTS

[0007] To solve the above technical problems, the utility model adopts the technical scheme of a drill rod fishing tool, which comprises a connecting rod and an internal expansion fishing head, a first tubular cavity passing through up and down is formed in the connecting rod, a telescopic rod is slidably installed in the first tubular cavity, and the internal expansion fishing head is assembled at the lower end of the telescopic rod.

[0008] The first lumen is a variable-diameter lumen, the upper end and the lower end of the variable-diameter lumen are wide sections and narrow sections respectively, the top end of the telescopic rod is provided with a variable-diameter section for limiting, the inner expanding fishing head is arranged inside the narrow section, and the inner diameter and the length of the narrow section are matched with the maximum outer diameter and the length of the inner expanding fishing head, and the outer diameter of the telescopic rod main body part is matched with the inner diameter of the narrow section.

[0009] The inner expanding fishing head comprises a main rod body and a tapered head, the tapered head is fixedly installed at the lower end of the main rod body, the inside of the main rod body is provided with a second lumen penetrating through the upper and lower portions, the top of the second lumen is a connecting section, the middle part is a material guiding cavity, and a plurality of material discharge ports are formed in the side wall of the main rod body.

[0010] Further, the opening direction of the material discharge port is inclined downward from high inside to low outside.

[0011] Further, the bottom of the second lumen is a sliding limiting section, the connecting section is used for butt joint with the lower end of the telescopic rod, the material guiding cavity is used for connecting the connecting section and the sliding limiting section, the side wall of the tapered head is centrally and symmetrically provided with a plurality of sliding grooves, the top ends of the plurality of sliding grooves are connected to form a columnar cavity, the inner diameter of the columnar cavity corresponds to the inner diameter of the sliding limiting section, and the inner expanding fishing head is provided with a clamping jaw.

[0012] The clamping jaw is composed of a plurality of jaw heads, the number of the jaw heads corresponds to the number of the sliding grooves, each sliding groove is slidably installed with a jaw head, the upper ends of the plurality of sliding grooves extend into the columnar cavity, a tapered block is slidably installed in the sliding limiting section, and the lower end of the tapered block extends into the columnar cavity, and the tapered surface of the tapered block abuts against the top ends of the plurality of jaw heads.

[0013] Further, the side wall of the first lumen in the connecting rod is axially provided with a guide structure.

[0014] Further, the connecting rod further comprises an assembly kit and a tapping kit, the assembly kit and the tapping kit are fixedly connected, the assembly kit is fixedly installed at the lower end of the connecting rod, the outer wall of the tapping kit is an inverted cone shape with a wide upper part and a narrow lower part, the inner wall of the tapping kit is a tapered shape with a narrow upper part and a wide lower part, tapping threads are formed in the inner wall of the tapping kit, and a chip removal groove is axially formed in the inner wall of the tapping kit.

[0015] Further, the middle section of the outer wall of the connecting rod is provided with a threaded section, and the assembly kit is fixedly installed at the threaded section of the connecting rod by screwing.

[0016] Further, the lower end of the assembly kit is provided with a flange, and the assembly kit and the tapping kit are fixedly connected through the flange.

[0017] Further, the lower end face of the assembly kit is provided with a plurality of upper trapezoidal grooves, the upper end face of the tapping sleeve is provided with a plurality of lower trapezoidal grooves, the plurality of upper trapezoidal grooves and the plurality of lower trapezoidal grooves are annularly distributed, and the plurality of upper trapezoidal grooves and the plurality of lower trapezoidal grooves are staggered in position.

[0018] The beneficial effects of the utility model are as follows:

[0019] The inner expanding fishing head uses abrasive as medium, and cooperates with the clamping jaw to realize high-stability inner expanding clamping effect.

[0020] For the middle-deep layer drill rod, the inner expanding and external tapping double-insurance connection mode is adopted between the fishing tool and the drill rod, sufficient stability redundancy can be provided, the fishing success rate is ensured, and the situation of wasting time in idle stroke is avoided. BRIEF DESCRIPTION OF DRAWINGS

[0021] Figure 1 It is a structural schematic view of the utility model connecting rod and inner expanding fishing head combination.

[0022] Figure 2 It is a structural schematic view of the utility model connecting rod, inner expanding fishing head, assembly kit and tapping sleeve combination.

[0023] Figure 3 It is a sectional view of the utility model.

[0024] Figure 4 It is a sectional view of the utility model inner expanding fishing head.

[0025] Figure 5 It is a structural schematic view of the utility model connecting rod.

[0026] Figure 6 It is another structural schematic view of the utility model connecting rod.

[0027] Figure 7 It is an explosion view of the utility model inner expanding fishing head.

[0028] Figure 8 It is another explosion view of the utility model inner expanding fishing head.

[0029] Figure 9 It is a structural schematic view of the utility model assembly kit.

[0030] Figure 10 It is another structural schematic view of the utility model assembly kit.

[0031] Figure 11 It is a structural schematic view of the utility model tapping sleeve.

[0032] Figure 12Another structural schematic view of the tapping set of the utility model;

[0033] Reference signs include:

[0034] 1, connecting rod; 101, threaded section; 102, variable diameter lumen; 103, telescopic rod; 104, guide structure;

[0035] 2, inner expansion fishing head; 201, main rod body; 202, taper head; 203, connecting section; 204, material guide cavity; 205, sliding limiting section; 206, sliding groove; 207, material discharge port; 208, clamping jaw; 209, taper block;

[0036] 3, assembly set; 301, flange; 302, upper trapezoidal groove;

[0037] 4, tapping set; 401, chip removal groove; 402, lower trapezoidal groove. DETAILED DESCRIPTION

[0038] The utility model will be described in detail below in combination with the drawings.

[0039] Refer to Figure 1 , Figure 3 , Figure 4 , Figure 5 , Figure 6 , Figure 7 And Figure 8 A drill rod fishing tool, connecting rod 1 and inner expansion fishing head 2 are included, the inside of connecting rod 1 is provided with the first lumen that passes through up and down, telescopic rod 103 is slidably installed in the first lumen, and inner expansion fishing head 2 is assembled to the lower end of telescopic rod 103;

[0040] Connecting rod 1 is connected with the drill rod for fishing outside, the first lumen is communicated with the inner cavity of the drill rod, and is connected with the external feeding equipment, and the external feeding equipment can deliver abrasive materials to the first lumen through the pipeline;

[0041] The first lumen is variable diameter lumen 102, the upper end and the lower end of variable diameter lumen 102 are wide section and narrow section respectively, the top end of telescopic rod 103 is provided with the variable diameter section for limiting, inner expansion fishing head 2 is arranged in the narrow section, and the inner diameter and the length of the narrow section are matched with the maximum outer diameter and the length of inner expansion fishing head 2, and the outer diameter of the main body portion of telescopic rod 103 is matched with the inner diameter of the narrow section;

[0042] Inner expansion fishing head 2 includes main rod body 201 and taper head 202, taper head 202 is fixedly installed to the lower end of main rod body 201, the inside of main rod body 201 is provided with the second lumen that passes through up and down, the top of second lumen is connecting section 203, the middle part is material guide cavity 204, and a plurality of material discharge ports 207 are formed in the side wall of main rod body 201.

[0043] The main rod body 201 is funnel-shaped with a narrow middle and wide ends, and the plurality of discharge ports 207 are located at the waist of the funnel shape.

[0044] An inner expanding fishing head 2 with a proper size is selected according to the inner diameter of the drill rod, and the inner diameter of the drill rod is usually about 1mm different from the maximum outer diameter of the inner expanding fishing head 2;

[0045] During the fishing operation, the inner expanding fishing head 2 is lowered into the drill hole. After the inner expanding fishing head 2 enters the inner cavity of the drill rod, the external feeding device is started, and the abrasive is discharged from the discharge port 207 between the inner wall of the drill rod and the inner expanding fishing head 2. The abrasive is continuously supplied during the lifting or rotating process, and the inner expanding fishing head 2 is locked with the drill rod under the action of the abrasive, thereby realizing the fixed relationship between the inner expanding fishing head 2 and the drill rod, and facilitating the subsequent drill rod disassembly and lifting operation;

[0046] Preferably, the abrasive is irregularly shaped particles with a particle size of about 1mm.

[0047] Preferably, the discharge port 207 is inclined downward from high inside to low outside.

[0048] Specifically, the bottom of the second lumen is a sliding limiting section 205, the connecting section 203 is used to butt joint with the lower end of the telescopic rod 103, the guide lumen 204 is used to communicate the connecting section 203 and the sliding limiting section 205, the side wall of the taper head 202 is centrally and symmetrically provided with a plurality of sliding grooves 206, the top ends of the plurality of sliding grooves 206 meet to form a columnar cavity, the inner diameter of the columnar cavity corresponds to the inner diameter of the sliding limiting section 205, and the inner expanding fishing head 2 is internally provided with a clamping jaw 208.

[0049] Preferably, the clamping jaw 208 is composed of a plurality of jaw heads, the number of the jaw heads corresponds to the number of the sliding grooves 206, each sliding groove 206 is slidably provided with a jaw head, and the upper ends of the plurality of sliding grooves 206 extend into the columnar cavity. The taper block 209 is slidably installed in the sliding limiting section 205, and the lower end of the taper block 209 extends into the columnar cavity. The taper surface of the taper block 209 abuts against the top ends of the plurality of jaw heads.

[0050] Preferably, the taper block 209 is a permanent magnet, which can attract the jaw heads to keep them in a stable storage state under the condition of no external force.

[0051] During the feeding process, the abrasive pushes the taper block 209 downward to drive it to displace downward.

[0052] During the downward movement of the taper block 209, the taper surface of the taper block 209 extrudes and pushes the jaw heads of the clamping jaw 208 to slide along the sliding grooves 206. The plurality of jaw heads slide outward to expand, and the inner expanding clamps the hollow drill rod.

[0053] Preferably, the sliding groove 206 is an inclined groove with a rhombic longitudinal section.

[0054] The side wall of the first lumen inside the connecting rod 1 is provided with an axial guide structure 104;

[0055] Specifically, the guide structure 104 is a strip-shaped flange, and the telescopic rod 103 is correspondingly provided with a groove, and the two are matched to avoid rotation of the telescopic rod 103 when sliding in the first lumen.

[0056] Referring to Figure 2 , Figure 9 , Figure 10 , Figure 11 and Figure 12 , a drill rod fishing tool further comprises an assembly kit 3 and a tapping kit 4, the assembly kit 3 is fixedly connected with the tapping kit 4, the assembly kit 3 is fixedly installed at the lower end of the connecting rod 1, the outer wall of the tapping kit 4 is an inverted cone shape which is wide at the top and narrow at the bottom, and the inner wall of the tapping kit 4 is a tapered shape which is narrow at the top and wide at the bottom, tapping threads are formed on the inner wall of the tapping kit 4, and a chip groove 401 is formed axially on the inner wall of the tapping kit 4.

[0057] The tapping kit 4 is fixed with the drill rod by tapping the outer wall of the drill rod and screwing it, and in this scheme, the tapping kit 4 and the internal expansion fishing head 2 are assembled at the same time to perform the fishing work of the middle-deep drill rod;

[0058] After the staff completes the fishing of the shallow drill rod according to experience, the tapping kit 4 is installed, and in the construction process, tapping is performed first, and then abrasive supply operation is performed;

[0059] In the process of fishing the middle drill rod, the internal expansion fishing head 2 provides the main gripping force, and the tapping kit 4 only needs to complete 20%-40% of the tapping stroke to provide redundant gripping force and ensure the stability of lifting;

[0060] In this scheme, the full tapping stroke does not need to be completed, the construction time is shorter, and at the same time, the redundant gripping force can ensure the fishing success rate and avoid the problem of fishing failure caused by insufficient gripping force of the internal expansion fishing head 2 due to inaccurate experience judgment, resulting in waste of time of empty stroke;

[0061] In the process of fishing the deep drill rod, the tapping kit 4 completes the full tapping stroke, and the internal expansion fishing head 2 provides redundant gripping force to improve the fishing success rate.

[0062] Among them, the staff can conservatively judge the fishing situation, and install the tapping kit 4 in advance, and the time wasted in the construction process is still much less than the time consumed in the empty stroke or the full tapping stroke.

[0063] A middle segment of the outer wall of the connecting rod 1 is provided with a threaded segment 101, and the assembly kit 3 is fixedly installed at the threaded segment 101 of the connecting rod 1 by screwing.

[0064] The lower end of the assembly kit 3 is provided with a flange 301, and the assembly kit 3 and the tapping kit 4 are fixedly connected through the flange 301.

[0065] The lower end surface of the assembly kit 3 is provided with a plurality of upper trapezoidal grooves 302, and the upper end surface of the tapping kit 4 is provided with a plurality of lower trapezoidal grooves 402.

[0066] The above is only the preferred embodiment of the present application, and for those skilled in the art, many changes can be made in the specific implementation and application range according to the idea of the present application, as long as these changes do not deviate from the concept of the present application, and all belong to the protection scope of the present application.

Claims

1. A drill pipe fishing tool characterized by: The connecting rod is internally provided with a first tubular cavity extending upward and downward, a telescopic rod is slidably installed in the first tubular cavity, and the inner expanding fishing head is assembled to the lower end of the telescopic rod; The first tubular cavity is a variable-diameter tubular cavity, the upper end and the lower end of the variable-diameter tubular cavity are wide sections and narrow sections respectively, the top end of the telescopic rod is provided with a variable-diameter section for limiting, the inner expanding fishing head is arranged inside the narrow section, and the inner diameter and the length of the narrow section are matched with the maximum outer diameter and the length of the inner expanding fishing head, and the outer diameter of the main body of the telescopic rod is matched with the inner diameter of the narrow section; The inner expanding fishing head comprises a main rod body and a tapered head, the tapered head is fixedly installed at the lower end of the main rod body, the inside of the main rod body is provided with a second tubular cavity extending upward and downward, the top of the second tubular cavity is a connecting section, the middle part is a material guiding cavity, and a plurality of material discharging ports are formed in the side wall of the main rod body.

2. A drill pipe fishing tool as defined in claim 1 wherein: The material discharging ports are inclined downward from high inside to low outside.

3. A drill pipe fishing tool as defined in claim 1 wherein: The bottom of the second tubular cavity is a sliding limiting section, the connecting section is used for butt joint with the lower end of the telescopic rod, the material guiding cavity is used for connecting the connecting section and the sliding limiting section, the side wall of the tapered head is centrally and symmetrically provided with a plurality of sliding grooves, the top ends of the plurality of sliding grooves are connected to form a columnar cavity, the inner diameter of the columnar cavity corresponds to the inner diameter of the sliding limiting section, and the inner expanding fishing head is internally provided with a clamping jaw. The clamping jaw is composed of a plurality of jaw heads, the number of the jaw heads corresponds to the number of the sliding grooves, each sliding groove is slidably installed with a jaw head, the upper ends of the plurality of sliding grooves extend into the columnar cavity, a tapered block is slidably installed in the sliding limiting section, and the lower end of the tapered block extends into the columnar cavity, and the tapered surface of the tapered block abuts against the top ends of the plurality of jaw heads.

4. A drill pipe fishing tool according to any one of claims 1-3, characterized in that: An axial guide structure is arranged on the side wall of the first tubular cavity in the connecting rod.

5. A drill pipe fishing tool according to any one of claims 1-3, characterized in that: The drilling rod fishing tool further comprises an assembling kit and a tapping kit, the assembling kit and the tapping kit are fixedly connected, the assembling kit is fixedly installed at the lower end of the connecting rod, the outer wall of the tapping kit is in an inverted conical shape with the upper part being wide and the lower part being narrow, the inner wall of the tapping kit is in a conical shape with the upper part being narrow and the lower part being wide, tapping threads are formed in the inner wall of the tapping kit, and a chip discharging groove is axially formed in the inner wall of the tapping kit.

6. A drill pipe fishing tool as defined in claim 5 wherein: A threaded section is arranged in the middle section of the outer wall of the connecting rod, and the assembling kit is fixedly installed at the threaded section of the connecting rod by screwing.

7. A drill pipe fishing tool as defined in claim 5 wherein: A flange is arranged at the lower end of the assembling kit, and the assembling kit and the tapping kit are fixedly connected through the flange.

8. A drill pipe fishing tool as defined in claim 5 wherein: A plurality of upper trapezoidal grooves are arranged on the lower end surface of the assembling kit, a plurality of lower trapezoidal grooves are arranged on the upper end surface of the tapping kit, the plurality of upper trapezoidal grooves and the plurality of lower trapezoidal grooves are annularly distributed, the positions of the plurality of upper trapezoidal grooves and the plurality of lower trapezoidal grooves are staggered, and the plurality of upper trapezoidal grooves and the plurality of lower trapezoidal grooves are embedded in each other when the assembling kit and the tapping kit are butt jointed.

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