File sample processing tool for inner wall of oil casing

Abstract

The invention discloses an oil casing inner wall file sample machining tool which comprises a center pull rod, a lower connecting thread is arranged on the outer wall of one end of the center pull rod, an upper connecting thread is arranged on the outer wall of the other end of the center pull rod, the center pull rod is sleeved with a limiter and a balance weight sleeve, the balance weight sleeve is connected with a clamping jaw in a clamped mode, and the outer wall of the clamping jaw is sleeved with a clamping jaw fixing ring. And hard alloy block units are fixedly connected to the clamping jaws. According to the file sample machining tool for the inner wall of the oil casing, the problem that in existing downhole throttler operation, due to the fact that friction force between the inner wall of the oil casing and a downhole throttler is small, the downhole throttler is difficult to fish is solved.

Description

TECHNICAL FIELD

[0001] The present application belongs to the technical field of oil and gas field development equipment, and particularly relates to a tool for filing the inner wall of an oil casing. BACKGROUND

[0002] In use, the inner wall of an oil and gas field downhole oil pipe or casing is usually required to be smooth to reduce the friction coefficient between fluid and the inner wall of the oil pipe or casing, thereby reducing the resistance in the process of liquid flow. However, in some special application scenarios, such as downhole choke operation, about 10%-15% of downhole chokes are difficult to fish every year, which requires the smooth inner wall of the oil casing to be processed into a file-shaped inner wall to increase the friction between the sealing rubber of the downhole choke and the inner wall of the oil pipe and the filing capacity of the inner wall of the oil casing, facilitate fishing of the downhole choke, save time and effort, and save cost. SUMMARY

[0003] The present application aims to provide a tool for filing the inner wall of an oil casing to solve the problem of difficulty in fishing downhole chokes in existing downhole choke operations due to small friction between the inner wall of the oil casing and the downhole choke.

[0004] The technical solution adopted by the present application is a tool for filing the inner wall of an oil casing, which comprises a center pull rod, the outer wall of one end of the center pull rod is provided with a lower connecting thread, the outer wall of the other end of the center pull rod is provided with an upper connecting thread, a limiter and a counterweight sleeve are sleeved on the center pull rod, a clamping jaw is clamped to the counterweight sleeve, a clamping jaw fixing ring is sleeved on the outer wall of the clamping jaw, and a hard alloy block unit is fixed to the clamping jaw.

[0005] The present application is also characterized in that:

[0006] The limiter, the counterweight sleeve, the clamping jaw and the hard alloy block unit are sequentially arranged along the direction from the lower connecting thread to the upper connecting thread.

[0007] A plurality of pin holes are formed in the center pull rod, and the limiter is fixed to the center pull rod by pins in the pin holes.

[0008] The center pull rod comprises a first straight section rod body, the lower connecting thread is arranged at one end of the first straight section rod body, a gradually expanding section rod body and a second straight section rod body are sequentially fixed to the other end of the first straight section rod body, and the upper connecting thread is arranged at the other end of the second straight section rod body.

[0009] The limiter and the counterweight sleeve are arranged on the outer wall of the first straight section rod body, one end of the clamping jaw is clamped to the counterweight sleeve on the outer wall of the first straight section rod body, and the other end of the clamping jaw is fixed to the hard alloy block unit on the outer wall of the gradually expanding section rod body.

[0010] The hard alloy block unit comprises a plurality of hard alloy blocks, and the plurality of hard alloy blocks are fixed to the outer wall of the clamping jaw in the circumferential direction.

[0011] The cemented carbide blocks are fixed to the chucks by either embedding or welding.

[0012] The beneficial effects of this invention are:

[0013] The file-like machining tool for the inner wall of oil casing and tubing provided by this invention performs file-like surface machining on the inner wall of the oil tubing and casing in the vertical section of oil and gas fields, increasing the surface roughness of the inner wall of the oil tubing and casing, thereby increasing the friction between the inner wall of the oil tubing and the downhole choke, facilitating the retrieval of the downhole choke. This invention can selectively machine one or more locations on the inner wall of the oil casing and tubing into a file-like inner wall, and has the characteristics of simple operation and accurate positioning. Attached Figure Description

[0014] Figure 1 This is a schematic diagram of the structure of the file-like machining tool for the inner wall of the oil casing of the present invention.

[0015] In the diagram, 1. Lower connecting thread, 2. Limiter, 3. Pin, 4. Central tie rod, 401. First straight section rod, 402. Gradually expanding section rod, 403. Second straight section rod, 5. Counterweight sleeve, 6. Claw, 7. Claw retaining ring, 8. Carbide block, 9. Pin hole, 10. Upper connecting thread. Detailed Implementation

[0016] The present invention will now be described in detail with reference to the accompanying drawings and specific embodiments.

[0017] The oil casing inner wall processing tool provided by this invention, such as... Figure 1As shown, the device includes a central tie rod 4. One end of the central tie rod 4 has a lower connecting thread 1 on its outer wall. The lower connecting thread 1 is mainly used to connect with other special tools for connecting well testing wire or logging cables. The other end of the central tie rod 4 has an upper connecting thread 10 on its outer wall. A limiter 2 and a counterweight sleeve 5 are fitted onto the central tie rod 4. The counterweight sleeve 5 is engaged with a chuck 6. The counterweight sleeve 5 mainly relies on its own weight to pull the chuck 6, keeping the chuck 6 in a retracted state. A chuck fixing ring 7 is fitted onto the outer wall of the chuck 6 to prevent the chuck 6 from dislodging from its assembly position. A hard alloy block unit is fixedly connected to the chuck 6. The limiter 2, counterweight sleeve 5, chuck 6, and hard alloy block unit are arranged sequentially along the direction from the lower connecting thread 1 to the upper connecting thread 10. The central tie rod 4 has several pin holes 9. The limiter 2 is fixedly connected to the central tie rod 4 through pins 3 in the pin holes 9. The central tie rod 4 includes the first... A straight section rod 401 has a lower connecting thread 1 at one end. A gradually expanding section rod 402 and a second straight section rod 403 are sequentially fixed to the other end of the first straight section rod 401. An upper connecting thread 10 is located at the other end of the second straight section rod 403. A limiter 2 and a counterweight sleeve 5 are both located on the outer wall of the first straight section rod 401. One end of a claw 6 engages with the counterweight sleeve 5 on the outer wall of the first straight section rod 401. The other end of the 6 is fixed to the outer wall of the gradually expanding section rod 402 with a cemented carbide block unit; the cemented carbide block unit includes several cemented carbide blocks 8, which are fixed to the outer wall of the claw 6 along the circumferential direction; the cemented carbide blocks 8 and the claw 6 are fixed by either inlay or welding. The main function of the cemented carbide blocks 8 is to contact the inner surface of the oil casing and to scratch file-like machining marks on the inner surface of the oil casing.

[0018] The working principle of the file-like machining tool for the inner wall of the casing and tubing provided by this invention is as follows: the test wire or cable is connected to the central tie rod 4 through the lower connecting thread 1. After the test wire or cable is lowered into the casing and tubing of the oil and gas well to a predetermined depth, the test wire or logging cable is quickly lowered. The central tie rod 4 moves downward under the action of gravity, and the claws 6, which are embedded or welded with hard alloy 8, come into contact with the inner wall of the casing and tubing. Under the action of friction, the claws 6 move upward along the gradually expanding section 402 of the central tie rod 4 and embed into the inner surface of the casing and tubing, forming file-like machining marks on the inner surface of the casing and tubing. By repeating this up and down motion, a dense file-like surface can be formed at a predetermined position on the inner wall of the casing and tubing, thus achieving the ultimate purpose of this tool: increasing the friction between the sealing rubber of the downhole choke and the inner wall of the tubing and the filing ability of the inner wall of the casing and tubing, making it easier to retrieve the downhole choke.

[0019] Example 1

[0020] The oil casing inner wall processing tool proposed in this embodiment is a file-like tool, such as... Figure 1As shown, it includes a central tie rod 4. One end of the central tie rod 4 has a lower connecting thread 1 on its outer wall, and the other end of the central tie rod 4 has an upper connecting thread 10 on its outer wall. A limiter 2 and a counterweight sleeve 5 are fitted on the central tie rod 4. The counterweight sleeve 5 is engaged with a claw 6. A claw fixing ring 7 is fitted on the outer wall of the claw 6. A hard alloy block unit is fixedly connected to the claw 6.

[0021] Example 2

[0022] The oil casing inner wall processing tool proposed in this embodiment is a file-like tool, such as... Figure 1 As shown, it includes a central tie rod 4. One end of the central tie rod 4 has a lower connecting thread 1 on its outer wall, and the other end of the central tie rod 4 has an upper connecting thread 10 on its outer wall. A limiter 2 and a counterweight sleeve 5 are fitted on the central tie rod 4. A claw 6 is engaged with the counterweight sleeve 5. A claw fixing ring 7 is fitted on the outer wall of the claw 6. A hard alloy block unit is fixed to the claw 6. The limiter 2, the counterweight sleeve 5, the claw 6, and the hard alloy block unit are arranged sequentially along the direction from the lower connecting thread 1 to the upper connecting thread 10.

[0023] Example 3

[0024] The oil casing inner wall processing tool proposed in this embodiment is a file-like tool, such as... Figure 1 As shown, the device includes a central tie rod 4. One end of the central tie rod 4 has a lower connecting thread 1 on its outer wall, and the other end of the central tie rod 4 has an upper connecting thread 10 on its outer wall. A limiter 2 and a counterweight sleeve 5 are fitted onto the central tie rod 4. The counterweight sleeve 5 is engaged with a claw 6. A claw fixing ring 7 is fitted onto the outer wall of the claw 6. A hard alloy block unit is fixedly connected to the claw 6. The limiter 2, the counterweight sleeve 5, the claw 6, and the hard alloy block unit are arranged sequentially along the direction from the lower connecting thread 1 to the upper connecting thread 10. The central tie rod 4 has several pin holes 9. The limiter 2 is fixedly connected to the central tie rod 4 through pins 3 in the several pin holes 9.

[0025] Example 4

[0026] The oil casing inner wall processing tool proposed in this embodiment is a file-like tool, such as... Figure 1As shown, the device includes a central tie rod 4. One end of the central tie rod 4 has a lower connecting thread 1 on its outer wall, and the other end has an upper connecting thread 10 on its outer wall. A limiter 2 and a counterweight sleeve 5 are fitted onto the central tie rod 4. A pawl 6 is engaged with the counterweight sleeve 5. A pawl fixing ring 7 is fitted onto the outer wall of the pawl 6. A hard alloy block unit is fixed to the pawl 6. The limiter 2, counterweight sleeve 5, pawl 6, and hard alloy block unit are connected along the direction from the lower connecting thread 1 to the upper connecting thread 10. The following are arranged sequentially: a number of pin holes 9 are provided on the central tie rod 4, and the limiter 2 is fixed to the central tie rod 4 through pins 3 in the pin holes 9 respectively; the central tie rod 4 includes a first straight section rod body 401, a lower connecting thread 1 is provided at one end of the first straight section rod body 401, and a gradually expanding section rod body 402 and a second straight section rod body 403 are sequentially fixed to the other end of the first straight section rod body 401, and an upper connecting thread 10 is provided at the other end of the second straight section rod body 403.

[0027] Example 5

[0028] The oil casing inner wall processing tool proposed in this embodiment is a file-like tool, such as... Figure 1 As shown, the device includes a central tie rod 4. One end of the central tie rod 4 has a lower connecting thread 1 on its outer wall, and the other end has an upper connecting thread 10 on its outer wall. A limiter 2 and a counterweight sleeve 5 are fitted onto the central tie rod 4. A pawl 6 is engaged with the counterweight sleeve 5. A pawl fixing ring 7 is fitted onto the outer wall of the pawl 6. A hard alloy block unit is fixed to the pawl 6. The limiter 2, counterweight sleeve 5, pawl 6, and hard alloy block unit are arranged sequentially along the direction from the lower connecting thread 1 to the upper connecting thread 10. The central tie rod 4 has several pin holes 9, and the limiter 2 passes through several pin holes 9 with pins respectively. 3. Fixed to the central tie rod 4; the central tie rod 4 includes a first straight section rod 401, with a lower connecting thread 1 at one end of the first straight section rod 401, and a gradually expanding section rod 402 and a second straight section rod 403 sequentially fixed to the other end of the first straight section rod 401, with an upper connecting thread 10 at the other end of the second straight section rod 403; the limiter 2 and the counterweight sleeve 5 are both located on the outer wall of the first straight section rod 401, one end of the claw 6 is engaged with the counterweight sleeve 5 on the outer wall of the first straight section rod 401, and the other end of the claw 6 is fixed to the hard alloy block unit on the outer wall of the gradually expanding section rod 402.

[0029] Example 6

[0030] The oil casing inner wall processing tool proposed in this embodiment is a file-like tool, such as... Figure 1As shown, the device includes a central tie rod 4. One end of the central tie rod 4 has a lower connecting thread 1 on its outer wall, and the other end has an upper connecting thread 10 on its outer wall. A limiter 2 and a counterweight sleeve 5 are fitted onto the central tie rod 4. A pawl 6 is engaged with the counterweight sleeve 5. A pawl fixing ring 7 is fitted onto the outer wall of the pawl 6. A hard alloy block unit is fixedly connected to the pawl 6. The limiter 2, counterweight sleeve 5, pawl 6, and hard alloy block unit are arranged sequentially along the direction from the lower connecting thread 1 to the upper connecting thread 10. The central tie rod 4 has several pin holes 9. The limiter 2 is fixedly connected to the central tie rod 4 through pins 3 in the pin holes 9. The central tie rod 4 includes a first straight section rod body 401. The lower connecting thread 1 is provided on the first straight section rod body 401. One end of the straight section rod 401 and the other end of the first straight section rod 401 are sequentially fixed to the expanding section rod 402 and the second straight section rod 403. The upper connecting thread 10 is provided at the other end of the second straight section rod 403. The limiter 2 and the counterweight sleeve 5 are both provided on the outer wall of the first straight section rod 401. One end of the claw 6 is engaged with the counterweight sleeve 5 on the outer wall of the first straight section rod 401, and the other end of the claw 6 is fixed to the carbide block unit on the outer wall of the expanding section rod 402. The carbide block unit includes several carbide blocks 8, which are fixed to the outer wall of the claw 6 along the circumferential direction. The carbide blocks 8 and the claw 6 are fixed by either embedding or welding.

Claims

1. A casing or tubing internal wall rasp tool characterized by, The center pull rod (4) is provided with a lower connecting thread (1) on one end of the outer wall, and an upper connecting thread (10) is provided on the other end of the outer wall, a limiter (2) and a counterweight sleeve (5) are sleeved on the center pull rod (4), the counterweight sleeve (5) is clamped with a claw (6), the outer wall of the claw (6) is sleeved with a claw fixing ring (7), and the claw (6) is fixedly connected with a hard alloy block unit.

2. The casing or tubing inner wall rasp tool according to claim 1, wherein, The limiter (2), the counterweight sleeve (5), the claw (6) and the hard alloy block unit are sequentially arranged along the direction from the lower connecting thread (1) to the upper connecting thread (10).

3. The casing or tubing inner wall reaming tool according to claim 1, wherein, A plurality of pin holes (9) are formed in the center pull rod (4), and the limiter (2) is fixedly connected with the center pull rod (4) through the pins (3) in the pin holes (9).

4. The casing or tubing inner wall reaming tool according to claim 1, characterized in that, The center pull rod (4) includes a first straight section rod body (401), the lower connecting thread (1) is arranged at one end of the first straight section rod body (401), and the first straight section rod body (401) is sequentially fixedly connected with a gradually expanding section rod body (402) and a second straight section rod body (403) at the other end, and the upper connecting thread (10) is arranged at the other end of the second straight section rod body (403).

5. The casing or tubing inner wall rasp tool of claim 4, wherein, The limiter (2) and the counterweight sleeve (5) are arranged on the outer wall of the first straight section rod body (401), one end of the claw (6) is clamped with the counterweight sleeve (5) on the outer wall of the first straight section rod body (401), and the other end of the claw (6) is fixedly connected with the hard alloy block unit on the outer wall of the gradually expanding section rod body (402).

6. The liner bore scalping tool according to claim 1, wherein, The hard alloy block unit includes a plurality of hard alloy blocks (8), and the plurality of hard alloy blocks (8) are fixedly connected to the outer wall of the claw (6) in the circumferential direction.

7. The casing or tubing inner wall reaming tool according to claim 1, characterized in that, The hard alloy blocks (8) and the claw (6) are fixedly connected in a setting or welding manner.

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