Multifunctional rod piece fallen object fisher

Abstract

The utility model relates to the technical field of petroleum and natural gas drilling, in particular to a multifunctional rod piece fallen object fisher, which comprises an upper connecting thread, a body, a grabbing and fishing tooth plate, a fixing bolt, a lower connecting thread and a guide device, the upper portion of the body is a connecting end connected with a drilling tool, and the lower portion of the body is connected with the guide device. At least one grabbing and fishing tooth plate set is arranged in the body in the axial direction at intervals, each grabbing and fishing tooth plate set comprises at least two grabbing and fishing tooth plates, and the grabbing and fishing tooth plates in each grabbing and fishing tooth plate set are arranged in the body in the circumferential direction at intervals. And an elastic piece for promoting the grabbing and fishing tooth plate to do reciprocating motion along the radial direction of the body is arranged between each grabbing and fishing tooth plate and the body. The fisher can fish out small rod piece falling objects, and the situation that due to the fact that the falling objects cannot be effectively fished out of a borehole, faults are complicated is avoided.

Description

Technical Field

[0001] The utility model relates to the technical field of oil and natural gas drilling, in particular to a multifunctional rod-piece fallen object salvage device. Background Art

[0002] To better explore and develop oil and gas resources, directional drilling is becoming increasingly common, and with it, the need for transmission logging operations in completions. However, issues such as poor wellbore trajectory, high friction, poor drilling fluid lubricity, and thick mudcake can easily lead to instruments becoming stuck or even falling into the well during transmission operations. Due to their small size, light weight, and specialized, indestructible materials, logging instruments can face significant challenges and difficulties when dropped in highly deviated or horizontal well sections, severely hindering their success rate.

[0003] Currently, a common method for recovering such debris includes the use of plate-type strong magnetic salvage devices. However, these devices present the following challenges: 1. Short salvage range: The attraction zone of a strong magnetic salvage device is typically located at the lower end of the casing, limiting its reach. 2. Unstable attraction: During the drilling process, due to the influence of wellbore quality and trajectory, scraping of debris against the wellbore wall can result in poor attraction, increasing the risk of salvage failure. 3. Temperature-dependent magnetic force: The magnetic force of a strong magnetic salvage device weakens with temperature fluctuations, affecting its applicability and reliability.

[0004] Windowed wire drums are also a common salvage tool. They work by elastically deforming the internal wire to hold fallen objects. However, this tool also presents some issues: 1. Difficulty selecting wire hardness: A wire that is too soft may not effectively hold the object, while a wire that is too hard may have difficulty entering the holding area. 2. Risk of pressurization: Excessive pressure during the salvage process may damage the object, increasing operational risks.

[0005] In summary, existing salvage tools are difficult to meet the salvage needs when facing such fallen objects. Utility Model Content

[0006] In view of the above-mentioned shortcomings of the existing technology in meeting the salvage needs, the utility model provides a multifunctional rod-shaped object salvage device that can salvage small rod-shaped objects and avoid the complication of failure caused by the inability to effectively salvage the objects out of the wellbore.

[0007] In order to solve the above technical problems, the present invention adopts the following technical solutions: a multifunctional rod object salvage device, comprising a main body, the upper part of the main body being a connecting end for connecting a drilling tool, the lower part of the main body being connected to a guiding device, at least one group of grabbing tooth plate groups being arranged axially at intervals inside the main body, each group of grabbing tooth plate groups comprising at least two grabbing tooth plates, and the grabbing tooth plates in each group of grabbing tooth plate groups being arranged circumferentially at intervals inside the main body; an elastic member is provided between each grabbing tooth plate and the main body to urge the grabbing tooth plate to reciprocate radially along the main body.

[0008] Furthermore, two groups of grabbing teeth plates are provided in the main body at intervals along the axial direction.

[0009] Furthermore, the grabbing teeth in the two groups of grabbing teeth are evenly arranged inside the body in the circumferential direction.

[0010] Furthermore, in each group of the grabbing tooth plates, four grabbing tooth plates are arranged along the circumference of the body.

[0011] Furthermore, the front end of the grabbing tooth plate is a grabbing portion. When the grabbing tooth plate is in an extended state, the grabbing portions at the front ends of the grabbing tooth plates in the two groups of grabbing tooth plate groups partially overlap in projection in the axial direction of the body.

[0012] Furthermore, the tooth-grabbing portion is provided with an inclined surface, and the inclined surface extends obliquely along the direction of the guiding device to the connecting end.

[0013] Furthermore, a fixing bolt for assembling the grabbing tooth plate is provided on the inner wall of the main body, a groove is provided on the grabbing tooth plate, the fixing bolt is inserted into the groove, the elastic member is placed in the groove, and one end is connected to the grabbing tooth plate and the other end is connected to the fixing bolt.

[0014] Furthermore, an annular mounting groove is provided on the inner wall of the main body, and the grabbing tooth plate is arranged in the mounting groove.

[0015] Furthermore, a guiding surface is provided on the inner side of the guiding device, and the inner diameter of the guiding surface gradually decreases from the outer end of the guiding device to one end of the connecting body, and the minimum inner diameter of the guiding device is greater than or equal to the inner diameter of the body.

[0016] Furthermore, the connecting end of the body is provided with an upper connecting thread connected to the drilling tool, and the other end of the body is provided with a lower connecting thread connected to the guiding device.

[0017] In summary, the present invention has the following beneficial effects:

[0018] (1) One end of the main body of the device is connected to the guide device, and a grabbing tooth plate is set in the main body. The grabbing tooth plate is elastically extended and retracted to generate gripping force and reset the grabbing tooth plate. Different small objects that enter the interior of the main body through the guide device are lowered and taken out by the device to achieve the purpose of salvaging. In this way, small rods can be effectively salvaged, including magnetic and non-magnetic objects, and the adaptability is wide.

[0019] (2) Different guide devices can be replaced according to different wellbores to suit wellbores of different sizes. After the fallen objects are introduced into the guide device and into the body, the drilling tool is lowered. The fallen objects force the grabbing teeth to shrink, and the grabbing teeth eat into the outer wall of the fallen objects. Multiple grabbing teeth are evenly distributed on the outer wall of the fallen objects, forming multiple points of force, which greatly protects the integrity of the fallen objects. This is conducive to guiding the fallen objects into the wellbore, effectively improving the flexibility and success rate of salvage, reducing and preventing salvage failures caused by scraping against the wellbore wall, and avoiding the complication of faults caused by the inability to effectively salvage the fallen objects out of the wellbore. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 This is a schematic diagram of a multifunctional rod-shaped object salvage device.

[0021] Figure 2 This is the layout diagram of the grabbing tooth plate inside the body.

[0022] The accompanying drawings are described as follows:

[0023] 1. Upper connecting thread; 2. Main body; 3. Grabbing tooth plate; 4. Fixing bolt; 5. Lower connecting thread; 6. Guide device; 61. Guide surface; 7. Mounting groove. DETAILED DESCRIPTION

[0024] The present invention will be further described in detail below with reference to the embodiments.

[0025] When implementing: Figures 1 to 2 As shown, a multifunctional rod object salvage device includes a main body 2, the upper part of the main body 2 is a connecting end for connecting a drilling tool, the lower part of the main body 2 is connected to a guiding device 6, at least one group of grabbing tooth plate groups are arranged axially at intervals inside the main body 2, each group of grabbing tooth plate groups includes at least two grabbing tooth plates 3, and the grabbing tooth plates 3 in each group of grabbing tooth plate groups are arranged circumferentially at intervals inside the main body 2; each grabbing tooth plate 3 is provided with an elastic member between the main body 2 to cause the grabbing tooth plate 3 to reciprocate radially along the main body 2.

[0026] The connecting end of the main body 2 is provided with an upper connecting thread 1 connected to the drilling tool, and the other end of the main body 2 is provided with a lower connecting thread 5 connected to the guide device 6. The drilling tool and the guide device 6 are connected to the main body 2 by a threaded connection, which is convenient for disassembly and replacement of the guide device 6.

[0027] The grabbing teeth 3 are arranged along the circumferential direction of the main body 2 and are all facing the axis of the main body 2. The grabbing teeth 3 have radial elasticity and restoring force under the action of the elastic member. The length of the grabbing teeth 3 is suitable for the grabbing activity space in the main body 2, and the strength of the grabbing teeth 3 can effectively meet the requirements of clamping the fallen objects. A guide surface 61 is provided on the inner side of the guide device 6. The guide surface 61 gradually decreases along the inner diameter from the outer end of the guide device 6 to the end connected to the main body 2, and the minimum inner diameter of the guide device 6 is greater than or equal to the inner diameter of the main body 2. The inner wall of the guide device 6 gradually decreases from one end to the other end connected to the main body 2 to form a guide surface 61 for guiding the fallen objects into the interior of the main body 2. The guide device 6 can be replaced to adapt to different wellbores. At the same time, the grabbing teeth 3 can also be replaced according to the outer diameter of the fallen objects. The guide device 6 guides the fallen objects into the main body 2 and is clamped by the grabbing teeth 3, effectively improving the flexibility and success rate of salvage, and reducing and preventing salvage failures caused by scraping against the well wall.

[0028] When implementing, Figure 2 As shown, two groups of grabbing teeth 3 are spaced axially within the body 2. The grabbing teeth 3 in each group are arranged in a circular, cross-shaped pattern along the inner wall of the body 2, meaning that the grabbing teeth 3 in both groups are evenly spaced circumferentially. Each group has two to four grabbing teeth 3 arranged circumferentially along the body 2, for a total of eight grabbing teeth 3 in both groups. These are evenly spaced circumferentially along the body 2, creating a 45° angle between the grabbing teeth 3 along the circumference of the body 2.

[0029] In this embodiment, the number of grabbing teeth 3 in a single group is set to four. The grabbing teeth portion of the grabbing teeth 3 close to the axis side is provided with an inclined surface, and the inclined surface extends obliquely along the direction of the guide device 6 to the connection end. At the same time, when the eight grabbing teeth portions are in the uncontracted state, when projected from the axial direction, two adjacent grabbing teeth portions partially overlap. When the grabbing teeth 3 and the grabbing teeth are integrated, the front end of the grabbing teeth 3 is the grabbing teeth portion. When the grabbing teeth 3 are in the extended state, the grabbing teeth portions at the front end of the grabbing teeth 3 in the two groups of grabbing teeth groups partially overlap in the axial projection of the main body 2. When the grabbing teeth 3 and the grabbing teeth are separate, the grabbing teeth 3 include a fixing seat and a grabbing teeth. The grabbing teeth are embedded and installed in the fixing seat, and the elastic member is assembled between the grabbing teeth and the fixing seat. The fixing seat is fixed to the inner wall of the main body by bolts.

[0030] Four grab teeth 3 are evenly distributed along the circumferential inner wall of the main body 2. Objects are pressed against the inner wall of the main body 2 by the contact points with the inclined surfaces of the grab teeth 3, thereby entering the grab teeth 3. The upper ends of the grab teeth 3, acted upon by springs, tightly adhere to the outer wall of the object. When the drill string is raised, the restoring force of the springs and the main body 2 move upward with the drill string, forcing the grab teeth 3 to contract and clamp the object. Within the radial horizontal plane of the main body where the single grab tooth group is located, the grabbing force is evenly distributed across the four grab teeth 3, creating a multi-point force distribution to protect the integrity of the object.

[0031] Specifically, when the front ends of the four grabbing teeth 3 move radially to the maximum distance, or when the grabbing teeth 3 are in a natural state, the grabbing teeth at the front ends of the extended grabbing teeth 3 have overlapping parts, and the grabbing portion formed by the total number of grabbing teeth 3 of the two groups of grabbing teeth groups has a smaller diameter.

[0032] During implementation, the inner wall of the body 2 is provided with an annular mounting groove 7, and the catching teeth 3 are arranged circumferentially within the mounting groove 7. The mounting groove 7 has a certain depth, providing more space for the catching teeth 3, making it more adaptable to falling objects of different sizes. The catching teeth 3 are internally provided with a groove, and the elastic member includes a spring disposed within the groove. The catching teeth 3 are fixed to the inner wall of the body 2 via a fixing bolt 4 installed on the inner wall of the body 2. The fixing bolt 4 is inserted into the groove, and the elastic member is placed within the groove, with one end connected to the catching teeth 3 and the other end connected to the fixing bolt 4.

[0033] Working principle of the tool: When the fallen object is introduced into the guide device 6 and enters the main body 2, the drill tool continues to be lowered. During the lowering process, the fallen object forces the upper part of the grabbing tooth plate 3 to move toward the inner wall of the main body 2 to make way. The fallen object passes through the lower grabbing tooth plate 3, and the grabbing part at the front end of the grabbing tooth plate 3 is tightly attached to the outer wall of the fallen object under the action of the spring; when the drill tool is lifted, the restoring force of the spring itself and the main body 2 move upward with the drill tool, forcing the grabbing tooth plate 3 to contract; the fallen object is pulled out along with the drill tool.

[0034] A method for using a multifunctional rod-drop salvage device comprises the following steps: a. assembling a drill tool assembly comprising the multifunctional rod-drop salvage device, a drill tool check valve, and a drill pipe on site; b. lowering the assembled drill tool assembly to a depth of 5 to 10 meters from the top of the fish; c. circulating drilling fluid through a pump for more than one and a half weeks; d. weighing; e. salvaging; and f. pulling out the drill tool assembly and dropping the fish.

[0035] During assembly, the drill string assembly, consisting of a multifunctional rod-type object salvage device, a drill check valve, and a drill pipe, is assembled on-site. The appropriate multifunctional rod-type object salvage device is selected based on the outer diameter of the object and the drill bit size. A guide device 6 is installed as needed based on the drill bit size, with the maximum outer diameter of the guide device 6 being 10-15 mm smaller than the drill bit size. Grab teeth 3 are also installed as needed based on the outer diameter of the object, with the inner diameter of each set of grab teeth 3 in its free state smaller than the outer diameter of the object. When lowering the salvage device, the theoretical well depth of the object is calculated, and the assembled drill string assembly is lowered into the well to a distance of 5-10 m from the top of the fish. The drilling fluid is then pumped through the wellbore for at least one and a half cycles to eliminate gas intrusion. A cycle is defined as the time it takes for the drilling fluid to enter the drill hole, exit the hole, and finally return to the surface in the wellbore annulus. This cycle, also called a circulation cycle, is the time it takes for the drilling fluid to be pumped in and out of the wellhead. During weighing, record the displacement and pump pressure with the pump on, the weight of the drill string being raised at a constant speed, the weight of the drill string being lowered at a constant speed, the torque and weight of the drill string rotating at 10 rpm / min when stopping and lowering, the torque and weight of the drill string rotating at 10 rpm / min when raising and lowering, and the torque and weight of the drill string rotating at 10 rpm / min when lowering. During salvage, operate the drill string assembly, rotating and lowering the drill string at 10 rpm / min. Once the pump pressure rises, stop rotating the drill string. Continue lowering the drill string until the weight is 30-50 kN less than the weight of the drill string being lowered at a constant speed with the pump on during weighing, then stop the pump. Retrieve the drill string assembly and any fallen objects. After catching the objects, remove the drill string assembly and objects from the well.

[0036] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent replacements, and improvements made within the spirit and principles of the present invention shall be included in the scope of protection of the present invention.

Claims

1. A multifunctional rod-shaped object salvage device, characterized in that: The invention comprises a body (2), the upper part of the body (2) being a connection end for connecting a drilling tool, the lower part of the body (2) being connected to a guide device (6), at least one group of grabbing tooth plate groups being arranged at intervals along the axial direction inside the body (2), each group of grabbing tooth plate groups comprising at least two grabbing tooth plates (3), the grabbing tooth plates (3) in each group of grabbing tooth plate groups being arranged at intervals along the circumferential direction inside the body (2); and an elastic member for causing the grabbing tooth plate (3) to reciprocate radially along the body (2) being arranged between each grabbing tooth plate (3) and the body (2).

2. The multifunctional rod-shaped object salvage device according to claim 1, characterized in that: Two groups of grabbing teeth (3) are arranged in the body (2) at intervals along the axial direction.

3. The multifunctional rod-shaped object salvage device according to claim 2, characterized in that: The grabbing tooth plates (3) in the two groups of grabbing tooth plate groups are evenly arranged in the circumferential direction inside the body (2).

4. The multifunctional rod-shaped object salvage device according to claim 3, characterized in that: Four grabbing tooth plates (3) in each grabbing tooth plate group are arranged along the circumference of the body (2).

5. The multifunctional rod-piece salvage device according to claim 4, characterized in that: The front end of the grabbing tooth plate (3) is a grabbing portion. When the grabbing tooth plate (3) is in an extended state, the grabbing portions at the front ends of the grabbing tooth plates (3) in the two groups of grabbing tooth plate groups partially overlap in projection in the axial direction of the body (2).

6. The multifunctional rod-piece salvage device according to claim 5, characterized in that: The tooth-grabbing portion is provided with an inclined surface, and the inclined surface extends obliquely along the direction of the guide device (6) to the connection end.

7. The multifunctional rod-piece salvage device according to claim 6, characterized in that: A fixing bolt (4) for assembling the grabbing tooth plate (3) is provided on the inner wall of the body (2), a groove is provided on the grabbing tooth plate (3), the fixing bolt (4) is inserted into the groove, and the elastic member is placed in the groove, with one end connected to the grabbing tooth plate (3) and the other end connected to the fixing bolt (4).

8. The multifunctional rod-piece salvage device according to claim 6, characterized in that: An annular mounting groove (7) is provided on the inner wall of the body (2), and the grabbing tooth plate (3) is arranged in the mounting groove (7).

9. The multifunctional rod-piece salvage device according to claim 1, characterized in that: A guiding surface (61) is provided on the inner side of the guiding device (6), and the inner diameter of the guiding surface (61) gradually decreases from the outer end of the guiding device (6) to the end connected to the body (2), and the minimum inner diameter of the guiding device (6) is greater than or equal to the inner diameter of the body (2).

10. The multifunctional rod-piece salvage device according to claim 9, characterized in that: An upper connecting thread (1) connected to a drilling tool is provided at a connecting end of the body (2), and a lower connecting thread (5) connected to a guide device (6) is provided at the other end of the body (2).

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