Small fallen object fishing socket

Abstract

The utility model discloses a small fallen object fishing cylinder which is characterized by comprising a cylinder body, an upper connector is arranged at one end of the cylinder body, a lower connector is arranged at the other end of the cylinder body, the lower connector is connected with a milling shoe or a pulling hook, and through the large drift diameter design of a second inner cavity, the fishing requirement of rubber or other large-diameter small fallen objects in a well is met. The adaptability to falling objects with different sizes is improved; a milling shoe is designed aiming at the scaling problem of the casing wall, and the scale can be removed through ground rotation, so that a fishing tool can smoothly reach the fish top position, and the fishing operation can be smoothly carried out; a pulling hook is designed for solving the problem that small iron falling objects are prone to being stuck, the stuck falling objects can be pulled out, and the fishing success rate is increased. The lengthened fishing cavity is designed, the situation that the number of small falling objects is large can be handled, and the fishing efficiency is improved.

Description

Technical Field

[0001] The utility model belongs to the technical field of small fallen object salvaging equipment in oil fields and relates to a small fallen object salvaging tube. Background Art

[0002] During oilfield production, the proper operation of oil and water wells is crucial to the efficient production of the entire field. However, small debris has become one of the main causes of disrupted well production. A wide variety of small debris occurs at oilfield production sites, including rubber, hydraulic clamp teeth, and sucker rod straighteners. These debris come in a variety of materials, including rubber and metal; in a variety of shapes, including blocks and flakes; and in a wide variety of sizes.

[0003] Currently, oilfields face numerous challenges in handling small debris. First, there is a lack of integrated small debris recovery tools, requiring specific tools to be used for each type of small debris. This not only increases tool inventory costs but also forces operators to frequently change tools when recovering different debris, significantly reducing work efficiency. Furthermore, in some oil and water wells, a variety of small debris are mixed together, creating a complex and unclear downhole situation. This makes it difficult for operators to accurately determine the type and location of the debris, further hindering recovery efforts. Furthermore, when the casing wall is scaled, small debris recovery tools cannot be lowered to the fishhead, further hindering recovery efforts. Small iron debris, such as tooth blocks, can easily become lodged in the casing annulus, where the impact of water flow has little effect on them, preventing them from being suspended and often leading to recovery failures. Furthermore, in situations where a large number of small debris are present, such as sucker rod straightening blocks, an undersized overshot chamber can result in low recovery efficiency, severely impacting oilfield production progress.

[0004] In summary, the existing small object salvage method can no longer meet the needs of efficient oil field production, and a new type of integrated small object salvage tool is urgently needed to solve these problems. Utility Model Content

[0005] The utility model aims to provide a small-piece fallen object overshot, which has the characteristics of overcoming casing wall scaling and adapting to the salvage of different fallen objects.

[0006] The technical solution adopted by the utility model is that the small fallen object salvage tube comprises a tube body, one end of the tube body is provided with an upper joint, the other end of the tube body is provided with a lower joint, and the lower joint is connected with a milling shoe or a puller hook.

[0007] The utility model is also characterized in that:

[0008] The lower joint is connected to the milling shoe, and copper basket claws are installed inside the milling shoe.

[0009] The lower joint is connected to a drawing hook, and a copper basket claw is installed inside the drawing hook.

[0010] The cylinder includes a first inner cavity and a second inner cavity. The inner diameter ratio of the first inner cavity to the second inner cavity is 1:1.2-1.5. One end of the first inner cavity is fixedly connected to an upper joint, the other end of the first inner cavity is connected to the second inner cavity, and the second inner cavity is fixedly connected to a lower joint.

[0011] A cross baffle is fixedly connected inside the first inner cavity near the upper joint.

[0012] The milling shoe comprises a milling shoe cylinder, one end of the milling shoe cylinder is provided with a milling shoe joint, the other end of the milling shoe cylinder is provided with milling teeth, the milling shoe joint is threadedly connected to the lower joint, and a copper basket claw is installed inside the milling shoe cylinder.

[0013] The copper basket claw includes a basket claw seat and a pin shaft. Several basket claws are installed in the basket claw seat. Each basket claw is fixed to the basket claw seat through a pin shaft. The basket claw seat is connected to the milling shoe cylinder.

[0014] The beneficial effects of the present invention are: 1. The large diameter design of the second inner cavity meets the demand for salvaging rubber or other small objects with large diameters in the well, and improves the adaptability to objects of different sizes.

[0015] 2. The milling shoe is designed to solve the scaling problem on the casing wall. It can remove scale by rotating on the ground, so that the salvage tool can reach the fish top position smoothly, ensuring the smooth progress of the salvage operation.

[0016] 3. Aiming at the problem that small iron objects are easily stuck, a pull-out hook is designed, which can pull out the stuck objects and improve the success rate of salvage.

[0017] 4. The extended salvage cavity is designed to cope with the situation where there are a large number of small fallen objects, thereby improving the salvage efficiency.

[0018] 5. Applied in multiple wells at Oil Production Plant No. 10, it has comprehensive functions, reduces on-site downtime, has high salvage efficiency, and has strong practical value. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 This is a structural diagram of a small fallen object overshot tube of the utility model;

[0020] Figure 2 This is the structural intention of the milling shoe in the small-piece overshot barrel of the utility model;

[0021] Figure 3 This is a left side view of the milling shoe in the small-piece overshot barrel of the utility model;

[0022] Figure 4 This is the structural intention of the copper basket claw in the small fallen object overshot tube of the utility model;

[0023] Figure 5This is the structural intention of the hook extraction device in the small fallen object overshot tube of the utility model.

[0024] In the figure, 1. Upper joint, 2. Cross baffle, 3. Cylinder, 4. Lower joint, 5. Milling shoe, 6. Copper basket claw, 7. Pulling hook;

[0025] 3-1. First inner cavity, 3-2. Second inner cavity, 5-1. Milling shoe upper joint, 5-2. Milling shoe cylinder, 5-3. Milling teeth, 6-1. Basket claw seat, 6-2. Basket claw, 6-3. Pin shaft. DETAILED DESCRIPTION

[0026] The present invention will be described in detail below with reference to the accompanying drawings and specific implementation methods.

[0027] The utility model of the small piece of fallen objects overshot tube, such as Figure 1 As shown, it includes a cylinder 3, an upper joint 1 is provided at one end of the cylinder 3, the upper joint 1 is used to be connected to the upper salvage pipe thread, a lower joint 4 is provided at the other end of the cylinder 3, the lower joint 4 is connected to a milling shoe 5 or a pull hook 7, the lower joint 4 is connected to the milling shoe 5, a copper basket claw 6 is installed inside the milling shoe 5, the lower joint 4 is connected to the pull hook 7, the pull hook 7 is used to pull out stuck objects for salvage, and a copper basket claw 6 is installed inside the pull hook 7. The cylinder 3 is designed as an "upper cone and lower cylinder" structure with an inner and outer diameter, including a first inner cavity 3-1 and a second inner cavity 3-2, the first inner cavity 3-1 and the second inner cavity 3-2. The inner diameter ratio of the inner diameter of the inner cavity 3-1 to the inner diameter of the second inner cavity 3-2 is 1:1.2-1.5. One end of the first inner cavity 3-1 is fixedly connected to the upper joint 1, and the other end of the first inner cavity 3-1 is connected to the second inner cavity 3-2. The second inner cavity 3-2 is fixedly connected to the lower joint 4. The first inner cavity 3-1 is used to increase the flow area of ​​the oil casing annulus, and the second inner cavity 3-2 is used to maximize the diameter of the salvage cavity. A cross baffle 2 is fixedly connected to the inside of the first inner cavity 3-1 near the upper joint 1 to prevent small objects from entering the inner cavity of the tubing string and prevent the tubing string from being blocked.

[0028] The milling shoe 5 includes a milling shoe cylinder 5-2, a milling shoe joint 5-1 is provided at one end of the milling shoe cylinder 5-2, and a milling tooth 5-3 is provided at the other end of the milling shoe cylinder 5-2. The outer surface of the milling tooth 5-3 is welded with hard alloy. The milling shoe joint 5-1 is threadedly connected to the lower joint 4, and a copper basket claw 6 is installed inside the milling shoe cylinder 5-2.

[0029] The copper basket claw 6 includes a basket claw seat 6-1 and a pin shaft 6-3. Several basket claws 6-2 are installed in the basket claw seat 6-1. Each basket claw 6-2 is fixed to the basket claw seat 6-1 by a pin shaft 6-3. Each basket claw 6-2 rotates around the pin shaft 6-3. The basket claw seat 6-1 is connected to the milling shoe cylinder 5-2. Under normal conditions, several basket claws 6-2 are acted upon by gravity, so that the inner cavity of the copper basket claw 6 is radially closed to prevent fallen objects from falling into the well for the second time; during the reverse circulation flushing process, the basket claw 6-2 is impacted by the water flow and rotates around the pin shaft, the closed channel is opened, and small fallen objects are allowed to enter the cylinder 3.

[0030] Example 1

[0031] This embodiment uses a small-item salvage tube to salvage small objects in the well. When there is a slight scale bridge on the casing wall and the salvage tool cannot approach the small objects, the milling shoe 5 is connected to the lower joint 4, and the upper joint 1 is connected to the pipe string. The salvage tool is lowered into the well. When the pipe string is lowered and encounters resistance, the pipe string is rotated to remove scale, so that the salvage tool is lowered to the fish top position, and circulating fluid is pumped into the annulus of the oil casing to flush the fish top. At this time, the basket claw 6-2 rotates around the pin shaft 6-3, the channel is opened, and the small objects enter the inner cavity of the barrel 3 under the impact of the circulating fluid. When the pump is stopped, the basket claw 6-2 is reset under the action of gravity, the inner cavity is closed, and the small objects are prevented from falling into the well again, and the salvage pipe string is pulled out.

[0032] Example 2

[0033] When the small fallen object salvage tube is used to salvage small fallen objects in the well in this embodiment, the milling shoe 5 is connected to the lower joint 4, and the upper joint 1 is connected to the pipe string. The salvage tool is lowered into the well to the small fallen object salvage tube to the fish top position, and circulating fluid is pumped into the annulus of the oil casing to flush the fish top. At this time, the basket claw 6-2 rotates around the pin shaft 6-3, and the channel is opened. The small fallen objects enter the inner cavity of the cylinder 3 under the impact of the circulating fluid. The cylinder 3 includes a first inner cavity 3-1 and a second inner cavity 3-2. The inner diameter ratio of the first inner cavity 3-1 to the inner diameter of the second inner cavity 3-2 is 1:1.2. When the pump is stopped, the basket claw 6-2 is reset under the action of gravity, the inner cavity is closed, and the small fallen objects are prevented from falling into the well again, and the salvage pipe string is pulled out.

[0034] Example 3

[0035] This embodiment uses a small-item salvage tube to salvage small items in the well. When the small items are stuck in the annulus of the oil casing, the pull hook 7 is connected to the lower joint 4, and the upper joint 1 is connected to the pipe string. The salvage tool is lowered into the well and lowered to the fish top position. The salvage is rotated and the hook 7 is used to pull out the stuck small items. Circulating fluid is pumped into the annulus of the oil casing to flush the fish top. At this time, the basket claw 6-2 rotates around the pin shaft 6-3, the channel is opened, and the small items enter the inner cavity of the cylinder 3 under the impact of the circulating fluid. The cylinder 3 includes a first inner cavity 3-1 and a second inner cavity 3-2. The inner diameter ratio of the inner diameter of the first inner cavity 3-1 to the inner diameter of the second inner cavity 3-2 is 1:1.3. When the pump is stopped, the basket claw 6-2 is reset under the action of gravity, the inner cavity is closed, and the small items are prevented from falling into the well again, and the salvage pipe string is pulled out.

[0036] Example 4

[0037] This embodiment uses a small object salvage tube to salvage small objects in the well. The small object salvage tube includes a cylinder 3, an upper joint 1 is provided at one end of the cylinder 3, and a lower joint 4 is provided at the other end of the cylinder 3. The lower joint 4 is connected to a milling shoe 5 or a pull hook 7. The lower joint 4 is connected to the milling shoe 5, and a copper basket claw 6 is installed inside the milling shoe 5. The lower joint 4 is connected to the pull hook 7, and a copper basket claw 6 is installed inside the pull hook 7. The cylinder 3 includes a first inner cavity 3-1 and a second inner cavity 3-2. The inner diameter ratio of the first inner cavity 3-1 to the inner diameter of the second inner cavity 3-2 is 1:1.5. One end of the first inner cavity 3-1 is fixedly connected to the upper joint 1, and the other end of the first inner cavity 3-1 is connected to the second inner cavity 3-2. The second inner cavity 3-2 is fixedly connected to the lower joint 4. A cross baffle 2 is fixedly connected to the inside of the first inner cavity 3-1 near the upper joint 1. The milling shoe 5 includes a milling shoe cylinder 5-2. A milling shoe joint 5-1 is provided at one end of the milling shoe cylinder 5-2, and a milling tooth 5-3 is provided at the other end of the milling shoe cylinder 5-2. The milling shoe joint 5-1 is threadedly connected to the lower joint 4, and a copper basket claw 6 is installed inside the milling shoe cylinder 5-2.

[0038] The copper basket claw 6 includes a basket claw seat 6-1 and a pin shaft 6-3. Several basket claws 6-2 are installed in the basket claw seat 6-1. Each basket claw 6-2 is fixed to the basket claw seat 6-1 through a pin shaft 6-3. The basket claw seat 6-1 is connected to the milling shoe cylinder 5-2.

Claims

1. Small object overshot, characterized by: It comprises a cylinder (3), one end of which is provided with an upper joint (1), the other end of which is provided with a lower joint (4), and the lower joint (4) is connected to a milling shoe (5) or a pull hook (7).

2. The small object overshot according to claim 1, characterized in that: The lower joint (4) is connected to the milling shoe (5), and a copper basket claw (6) is installed inside the milling shoe (5).

3. The small object overshot according to claim 1, characterized in that: The lower joint (4) is connected to a drawing hook (7), and a copper basket claw (6) is installed inside the drawing hook (7).

4. The small object overshot according to claim 1, characterized in that: The cylinder (3) comprises a first inner cavity (3-1) and a second inner cavity (3-2), wherein the inner diameter ratio of the first inner cavity (3-1) to the inner diameter of the second inner cavity (3-2) is 1:1.2-1.5, an upper joint (1) is fixedly connected to one end of the first inner cavity (3-1), the other end of the first inner cavity (3-1) is connected to the second inner cavity (3-2), and the second inner cavity (3-2) is fixedly connected to a lower joint (4).

5. The small object overshot according to claim 4, characterized in that: A cross baffle (2) is fixedly connected to the interior of the first inner cavity (3-1) near the upper joint (1).

6. The small object overshot according to claim 1, characterized in that: The milling shoe (5) comprises a milling shoe cylinder (5-2), one end of the milling shoe cylinder (5-2) is provided with a milling shoe joint (5-1), the other end of the milling shoe cylinder (5-2) is provided with milling teeth (5-3), the milling shoe joint (5-1) is threadedly connected to the lower joint (4), and a copper basket claw (6) is installed inside the milling shoe cylinder (5-2).

7. The small object overshot according to claim 2, characterized in that: The copper basket claw (6) comprises a basket claw seat (6-1) and a pin shaft (6-3); a plurality of basket claws (6-2) are installed in the basket claw seat (6-1); each basket claw (6-2) is fixed to the basket claw seat (6-1) via a pin shaft (6-3); and the basket claw seat (6-1) is connected to the milling shoe cylinder (5-2).

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