An electrically controlled self-setting and separate injection well packer

Abstract

The present invention provides an electric control self-setting injection well packer, comprising: a lower joint and an upper joint. A central tube is connected between the lower joint and the upper joint. A protection tube assembly is arranged on the periphery of the central tube. A setting assembly, an electromagnetic switch assembly and a hydraulic energy storage assembly are arranged between the central tube and the protection tube assembly; The hydraulic energy storage assembly includes a propulsion body, a high-pressure spring and a thrust ring sleeved on the central tube. The upper end of the propulsion body extends into the lower port of the protection tube assembly. The thrust ring is fixed above the lower joint. The high-pressure spring is pressed between the propulsion body and the thrust ring; wherein, the initial state of the high-pressure spring is a compressed state, and the space between the propulsion body and the electromagnetic switch assembly is filled with hydraulic oil.

Description

Technical Field

[0001] The present invention belongs to the field of oilfield water injection equipment, and particularly relates to an electric control self-setting separate injection well packer. Background Art

[0002] In the existing common packers, the power of the setting mechanism all comes from the pressure applied to the central pipe. The setting mechanism applies an axial pressure to the rubber cylinder, so that the rubber cylinder is compressed axially and then expands outwards, increasing in diameter, thereby realizing the setting of the packer. However, this process method requires a large high-pressure pump truck as the power source, not only with high construction costs, but also with the risk of high-pressure leakage and injury. Summary of the Invention

[0003] The present invention provides an electric control self-setting separate injection well packer to overcome the above problems or at least partially solve or alleviate the above problems.

[0004] An electric control self-setting separate injection well packer includes:

[0005] A lower joint and an upper joint, a central cylinder is connected between the lower joint and the upper joint, a protection cylinder assembly is arranged on the periphery of the central cylinder, and a setting assembly, an electromagnetic switch assembly and a hydraulic energy storage assembly are arranged between the central cylinder and the protection cylinder assembly;

[0006] The hydraulic energy storage assembly includes a propulsion body, a high-pressure spring and a thrust ring sleeved on the central cylinder. The upper end of the propulsion body extends into the lower port of the protection cylinder assembly. The thrust ring is fixed above the lower joint, and the high-pressure spring abuts between the propulsion body and the thrust ring;

[0007] Wherein, the initial state of the high-pressure spring is a compressed state, and the space between the propulsion body and the electromagnetic switch assembly is filled with hydraulic oil.

[0008] The electric control self-setting separate injection well packer of the present invention further has the following optional features.

[0009] Optionally, the electromagnetic switch assembly includes a circuit chamber, a valve ball, a slider, a sealing cap, an electromagnet, a permanent magnet, a linkage shaft, and a pressure guiding cylinder. A pressure guiding channel is provided on the pressure guiding cylinder. The lower port of the pressure guiding channel is blocked by the valve ball. The sealing cap is arranged on the outer side of the lower end of the pressure guiding cylinder. The slider is horizontally arranged at the lower end of the sealing cap. The inner end of the slider faces the valve ball. The electromagnet is arranged below the sealing cap. The electromagnet is electrically connected to the circuit chamber. The permanent magnet is arranged below the electromagnet. Through holes are provided on the electromagnet and the permanent magnet. The linkage shaft is slidably assembled in the through holes. The lower end of the linkage shaft is connected to the permanent magnet. The upper end of the linkage shaft extends out of the upper end of the electromagnet. An outer conical surface is arranged at the upper end of the linkage shaft. The outer end of the slider abuts against the outer conical surface.

[0010] Optionally, the setting packer assembly includes a setting head, a liner, an upper rubber cylinder, a first spacer ring, a middle rubber cylinder, a second spacer ring, a lower rubber cylinder, a push pipe, and a horse tooth sleeve; the setting head is sleeved on the upper part of the central tube. The lower end of the setting head is connected with the liner. The upper rubber cylinder, the first spacer ring, the middle rubber cylinder, the second spacer ring, the lower rubber cylinder, and the push pipe are sequentially and slidably sleeved on the liner. The horse tooth sleeve is hermetically connected to the outer side of the lower end of the push pipe. The outer side wall of the lower end of the horse tooth sleeve is slidably matched with the protection tube assembly.

[0011] Optionally, the lower end of the liner is connected with an inner tube. A releasing pin is arranged on the push pipe. The releasing pin passes through the inner tube and is fixed on the central tube. The inner side of the upper end of the horse tooth sleeve is slidably and hermetically matched with the outer side of the lower end of the push pipe.

[0012] Optionally, a lock ring hanger is further sleeved on the inner tube. The lock ring hanger is located below the push pipe. A lock ring is sleeved on the outer side of the lock ring hanger. A setting pin is arranged between the lock ring hanger and the inner tube.

[0013] Optionally, the lower end of the upper joint is connected with the central tube. A washing cylinder is connected between the outer side of the upper joint and the outer side of the setting head. A washing piston is slidably and hermetically assembled between the outer side of the lower end of the upper joint, the outer side of the upper end of the setting head, and the inner side of the washing cylinder. A through hole communicating with the cavity above the washing piston is arranged on the upper joint. A through hole communicating with the cavity below the washing piston is arranged on the washing cylinder. A washing channel communicating with the inner side of the washing piston is arranged between the setting head, the liner, and the push sleeve.

[0014] Optionally, through holes are arranged on the surface of the liner and on the push sleeve. When the push sleeve squeezes upward for setting, the through holes on the push sleeve are communicated with the through holes on the liner.

[0015] Optionally, the casing assembly includes a lower outer casing, a protective sleeve, an upper outer casing, a sleeve, and an outer connecting sleeve; the lower end of the lower outer casing is slidably sleeved on the outside of the propulsion body, the upper end of the lower outer casing is connected to the upper outer casing through the protective sleeve, the upper end of the upper outer casing is connected to the outer connecting sleeve through the sleeve, and the upper end of the outer connecting sleeve is slidably and sealingly fitted with the outside of the lower end of the sliding sleeve on the outside of the horse tooth sleeve.

[0016] Optionally, the central tube includes an upper tube, a connecting ring, and a lower tube; the upper end of the upper tube is connected to the lower end of the upper joint, the lower end of the upper tube is connected to the lower tube through the connecting ring, and the lower end of the lower tube is connected to the lower joint.

[0017] The electric control self-setting injection well packer of the present invention controls the electromagnetic body to generate magnetic force through an electric circuit, generates a repulsive force with the permanent magnet, pushes the valve ball to open the pressure guiding hole, conducts the pre-compressed spring force to the packer setting mechanism through hydraulic oil, compresses the rubber cylinder, and completes the setting of the packer, reducing the need for a large high-pressure pump truck to pressurize during the setting of a conventional packer, and reducing the operation cost and risk. Description of the Drawings

[0018] Figure 1 is the full-section structural schematic diagram of the upper half of the present invention;

[0019] Figure 2 is the full-section structural schematic diagram of the lower half of the present invention;

[0020] Figure 3 is the pressure conduction schematic diagram of the present invention;

[0021] Figure 4 is Figure 2 the structural schematic diagram of the electromagnetic switch assembly in

[0022] In the above figures: 1 lower joint; 2 thrust ring; 3 lower tube; 4 high-pressure spring; 5 propulsion body; 6 hydraulic oil; 7 permanent magnet; 8 electromagnet; 9 linkage shaft; 10 slider; 11 valve ball; 12 wire plug; 13 sealing cap; 14 circuit chamber; 15 lower outer casing; 16 pressure guiding cylinder; 17 protective sleeve; 18 connecting ring; 19 upper outer casing; 20 sleeve; 21 outer connecting sleeve; 22 horse tooth sleeve; 23 inner tube; 24 locking ring; 25 locking ring hook; 26 setting pin; 27 releasing pin; 28 liner; 29 propulsion tube; 30 lower rubber cylinder; 31 second spacer ring; 32 middle rubber cylinder; 33 first spacer ring; 34 upper rubber cylinder; 35 setting head; 36 upper tube; 37 washing piston; 38 washing cylinder; 39 upper joint. Detailed Description of the Invention

[0023] Example 1

[0024] Reference Figure 1 and Figure 2 An embodiment of the present invention provides an electronically controlled self-setting injection well packer, including: a lower joint 1 and an upper joint 39. A central tube is connected between the lower joint 1 and the upper joint 39. A protection tube assembly is arranged outside the central tube. A setting assembly, an electromagnetic switch assembly and a hydraulic energy storage assembly are arranged between the central tube and the protection tube assembly; the hydraulic energy storage assembly includes a propulsion body 5, a high-pressure spring 4 and a thrust ring 2 sleeved on the central tube. The upper end of the propulsion body 5 extends into the lower port of the protection tube assembly. The thrust ring 2 is fixed above the lower joint 1. The high-pressure spring 4 abuts between the propulsion body 5 and the thrust ring 2; wherein, the initial state of the high-pressure spring 4 is a compressed state, and the space between the propulsion body 5 and the electromagnetic switch assembly is filled with hydraulic oil.

[0025] The central tube includes an upper tube 36. The upper end of the upper tube 36 is connected to the lower end of the upper joint 39. The lower end of the upper tube 36 is connected to a lower tube 3 through a connecting ring 18. The lower end of the lower tube 3 is connected to the lower joint 1.

[0026] The lower joint 1 and the thrust ring 2 are connected to the lower end of the lower tube 3. The high-pressure spring 4 and the propulsion body 5 are sleeved on the lower tube 3. The high-pressure spring 4 stores energy in a compressed state during assembly and is used to provide power for setting. After the electromagnetic switch assembly is opened by circuit control, the high-pressure spring 4 in the hydraulic energy storage assembly is released. The high-pressure spring 4 pushes the hydraulic oil 6 upward through the propulsion body 5 into the lower port of the protection tube assembly. The hydraulic oil 6 is conducted to the packer setting mechanism to compress the rubber cylinder and complete the setting of the packer.

[0027] Embodiment 2

[0028] Reference Figure 2 、 Figure 3 and Figure 4On the basis of Example 1, the electromagnetic switch assembly includes a circuit compartment 14, a valve ball 11, a slider 10, a sealing cap 13, an electromagnet 8, a permanent magnet 7, a linkage shaft 9 and a pressure-conducting cylinder 16; a pressure-conducting channel is provided on the pressure-conducting cylinder 16, a valve ball 11 is blocked at the lower port of the pressure-conducting channel, a sealing cap 13 is provided on the outer side of the lower end of the pressure-conducting cylinder 16, a slider 10 is horizontally provided at the lower end of the sealing cap 13, and the inner end of the slider 10 is directly opposite to the valve ball 11, so An electromagnet 8 is arranged below the sealing cap 13, and the electromagnet 8 is electrically connected to the circuit compartment 14. A permanent magnet 7 is arranged below the electromagnet 8. Through holes are arranged on the electromagnet 8 and the permanent magnet 7. A linkage shaft 9 is slidably assembled in the through hole. The lower end of the linkage shaft 9 is connected to the permanent magnet 7, and the upper end of the linkage shaft 9 extends out of the upper end of the electromagnet 8. The upper end of the linkage shaft 9 is provided with an outer conical surface, and the outer end of the slider 10 is pressed against the outer conical surface.

[0029] The pressure-conducting cylinder 16 is sleeved on the lower cylinder 3. A circuit compartment 14, a sealing cap 13, an electromagnet 8 and a permanent magnet 7 are arranged between the pressure-conducting cylinder 16 and the casing assembly. The circuit compartment 14 is connected to a cable through a wire plug 12. The circuit compartment 14 and the electromagnet 8 can be powered by the cable. After the electromagnet 8 is powered, it pushes the permanent magnet 7 to move downward. The permanent magnet 7 pulls the linkage shaft 9 downward, so that the upper part of the linkage shaft 9 squeezes the slider 10 inward through the outer cone surface. When the slider 10 moves inward, the valve ball 11 is pushed out from the lower port of the pressure-conducting channel on the pressure-conducting cylinder 16 to unblock the pressure-conducting channel. At this time, the high-pressure hydraulic oil 6 can provide the sealing pressure to the sealing assembly through the pressure-conducting channel to achieve the sealing of the entire device.

[0030] Example 3

[0031] refer to Figure 1 On the basis of Example 1, the sealing assembly includes a sealing head 35, a liner 28, an upper rubber tube 34, a first spacer ring 33, a middle rubber tube 32, a second spacer ring 31, a lower rubber tube 30, a propulsion tube 29 and a tooth sleeve 22; the sealing head 35 is sleeved on the upper part of the center tube, and the lower end of the sealing head 35 is connected to the liner 28, and the liner 28 is slidably sleeved with an upper rubber tube 34, a first spacer ring 33, a middle rubber tube 32, a second spacer ring 31, a lower rubber tube 30 and a propulsion tube 29 in sequence; the outer side of the lower end of the propulsion tube 29 is sealed and connected with the tooth sleeve 22, and the outer side wall of the lower end of the tooth sleeve 22 is slidably matched with the casing assembly.

[0032] When the high-pressure hydraulic oil 6 flows through the pressure guiding channel to the lower part of the propulsion pipe 29, it will push the propulsion pipe 29 to move upward between the ferrule 22 and the liner 28, sequentially squeezing the lower rubber cylinder 30, the second spacer ring 31, the middle rubber cylinder 32, the first spacer ring 33 and the upper rubber cylinder 34, causing the lower rubber cylinder 30, the middle rubber cylinder 32 and the upper rubber cylinder 34 to expand and form a setting in the wellbore casing.

[0033] Embodiment 4

[0034] Reference Figure 1 , on the basis of Embodiment 3, an inner pipe 23 is connected to the lower end of the liner 28, a releasing pin 27 is arranged on the propulsion pipe 29, the releasing pin 27 passes through the inner pipe 23 and is fixed on the central cylinder, and the inner side of the upper end of the ferrule 22 is in sliding sealing fit with the outer side of the lower end of the propulsion pipe 29.

[0035] In the initial state, the liner 28 and the inner pipe 23 are indirectly fixed on the upper cylinder 36, the upper end of the liner 28 is threadedly connected to the setting head 35, the setting head 35 is pin-connected to the washing cylinder 38, and the upper end of the washing cylinder 38 is threadedly connected to the upper joint 39. Therefore, the upper end of the liner 28 is also fixedly connected. The lower end of the liner 28 is threadedly connected to the inner pipe 23. The releasing pin 27 passes through the propulsion pipe 29 and the inner pipe 23 and is fixed on the upper cylinder 36 of the central cylinder. When the hydraulic oil 6 pushes the propulsion pipe 29 upward, after cutting off the releasing pin 27, it can squeeze the lower rubber cylinder 30, the second spacer ring 31, the middle rubber cylinder 32, the first spacer ring 33 and the upper rubber cylinder 34 upward to achieve setting.

[0036] Embodiment 5

[0037] Reference Figure 1 , on the basis of Embodiment 4, a lock ring hanger 25 is further sleeved on the inner pipe 23. The lock ring hanger 25 is located below the propulsion pipe 29. A lock ring 24 is sleeved on the outer side of the lock ring hanger 25, and a setting pin 26 is arranged between the lock ring hanger 25 and the inner pipe 23.

[0038] When the hydraulic oil 6 pushes the propulsion pipe 29 upward to cut off the releasing pin 27 and then moves upward, the propulsion pipe 29 drives the ferrule 22 to move upward a certain distance until the helical teeth on the inner side of the lower end of the ferrule 22 hook the helical teeth on the surface of the lock ring 24 downward, preventing the propulsion pipe 29 and the ferrule 22 from retreating downward and maintaining the extrusion setting of the lower rubber cylinder 30, the middle rubber cylinder 32 and the upper rubber cylinder 34.

[0039] Embodiment 6

[0040] Reference Figure 1, on the basis of Embodiment 3 or Embodiment 4, the lower end of the upper joint 39 is connected to the central cylinder, a washing cylinder 38 is connected between the outer side of the upper joint 39 and the outer side of the setting head 35, and a washing piston 37 is slidably and sealingly assembled between the outer side of the lower end of the upper joint 39 and the outer side of the upper end of the setting head 35 and the inner side of the washing cylinder 38. A through hole communicating with the cavity above the washing piston 37 is provided on the upper joint 39, a through hole communicating with the cavity below the washing piston 37 is provided on the washing cylinder 38, and a washing channel communicating with the inner side of the washing piston 37 is provided between the setting head 35, the liner 28 and the propulsion pipe 29.

[0041] The lower end of the upper joint 39 is connected to the upper end of the upper cylinder 36. When the pressure in the tubing is greater than the pressure in the wellbore casing, the pressure fluid will enter the inner side of the washing cylinder 38 through the through hole on the upper joint 39 and push the washing piston 37 to move downward to block the through hole on the washing cylinder 38; when the washing channel is communicated and washing is required, washing fluid is injected into the wellbore casing. The washing fluid will enter the inner side of the washing cylinder 38 through the through hole on the washing cylinder 38 and push the washing piston 37 to move upward to block the through hole on the upper joint 39. At the same time, the washing fluid will flow into the lower part of the setting position through the washing channel between the setting head 35, the liner 28 and the propulsion pipe 29, and reverse washing can be realized.

[0042] Embodiment 7

[0043] Reference Figure 1 , on the basis of Embodiment 6, through holes are provided on the surface of the liner 28, and through holes are provided on the propulsion pipe 29. When the propulsion pipe 29 squeezes the setting upward, the through holes on the propulsion pipe 29 are communicated with the through holes on the liner 28.

[0044] When the propulsion pipe 29 squeezes the setting upward, due to the pressure consumption of the hydraulic oil 6, the propulsion pipe 29 will not move further upward, and at the same time, the through holes on the liner 28 are aligned with the through holes on the propulsion pipe 29. At this time, the entire washing channel communicates the upper and lower parts of the setting position.

[0045] Embodiment 8

[0046] Reference Figure 1 and Figure 2 , on the basis of any one of Embodiments 3 to 7, the casing assembly includes a lower outer casing 15, a protective sleeve 17, an upper outer casing 19, a sleeve 20 and an outer connecting sleeve 21; the lower end of the lower outer casing 15 is slidably sleeved on the outer side of the propulsion body 5, the upper end of the lower outer casing 15 is connected to the upper outer casing 19 through the protective sleeve 17, the upper end of the upper outer casing 19 is connected to the outer connecting sleeve 21 through the sleeve 20, and the upper end of the outer connecting sleeve 21 is slidably and sealingly matched with the outer side of the lower end of the split nut 22.

[0047] The hydraulic oil 6, the permanent magnet 7, the electromagnet 8, the sealing cap 13 and the circuit chamber 14 are located inside the lower outer casing 15, and the pressure guiding cylinder 16 is located between the sealing cap 13, the circuit chamber 14 and the protective sleeve 17 and the lower cylinder 3; the inner side of the upper end of the sleeve 20 is connected to the lower end of the inner tube 23.

[0048] As described above, only the preferred specific embodiments of the present invention are provided, but the protection scope of the present invention is not limited thereto. Any changes or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed by the present invention should be covered by the protection scope of the present invention. Therefore, the protection scope of the present invention should be subject to the protection scope of the claims. The components and structures not described in detail in this embodiment are well-known components and common structures or common means in this industry, and will not be described one by one here.

Claims

1. An electric control self-setting injection well packer, characterized in that, Comprising: A lower joint (1) and an upper joint (39), a central cylinder is connected between the lower joint (1) and the upper joint (39), a protection cylinder assembly is arranged on the periphery of the central cylinder, and a setting assembly, an electromagnetic switch assembly and a hydraulic energy storage assembly are arranged between the central cylinder and the protection cylinder assembly; The hydraulic energy storage assembly includes a propulsion body (5), a high-pressure spring (4) and a thrust ring (2) sleeved on the central cylinder. The upper end of the propulsion body (5) extends into the lower port of the protection cylinder assembly. The thrust ring (2) is fixed above the lower joint (1), and the high-pressure spring (4) abuts between the propulsion body (5) and the thrust ring (2); Wherein, the initial state of the high-pressure spring (4) is a compressed state, and the space between the propulsion body (5) and the electromagnetic switch assembly is filled with hydraulic oil; The electromagnetic switch assembly includes a circuit chamber (14), a valve ball (11), a slider (10), a sealing cap (13), an electromagnet (8), a permanent magnet (7), a linkage shaft (9) and a pressure guiding cylinder (16); a pressure guiding channel is arranged on the pressure guiding cylinder (16), the lower port of the pressure guiding channel is blocked by the valve ball (11), the sealing cap (13) is arranged on the outer side of the lower end of the pressure guiding cylinder (16), the slider (10) is horizontally arranged at the lower end of the sealing cap (13), the inner end of the slider (10) faces the valve ball (11), the electromagnet (8) is arranged below the sealing cap (13), the electromagnet (8) is electrically connected with the circuit chamber (14), the permanent magnet (7) is arranged below the electromagnet (8), through holes are arranged on the electromagnet (8) and the permanent magnet (7), the linkage shaft (9) is slidably assembled in the through holes, the lower end of the linkage shaft (9) is connected to the permanent magnet (7), the upper end of the linkage shaft (9) extends out of the upper end of the electromagnet (8), and an outer conical surface is arranged at the upper end of the linkage shaft (9), and the outer end of the slider (10) abuts against the outer conical surface.

2. The electric control self-setting injection well packer according to claim 1, characterized in that The setting assembly includes a setting head (35), a liner (28), an upper rubber cylinder (34), a first spacer ring (33), a middle rubber cylinder (32), a second spacer ring (31), a lower rubber cylinder (30), a propulsion pipe (29) and a horseshoe sleeve (22); the setting head (35) is sleeved on the upper part of the central cylinder, the liner (28) is connected to the lower end of the setting head (35), the upper rubber cylinder (34), the first spacer ring (33), the middle rubber cylinder (32), the second spacer ring (31), the lower rubber cylinder (30) and the propulsion pipe (29) are sequentially and slidably sleeved on the liner (28); the horseshoe sleeve (22) is hermetically connected to the outer side of the lower end of the propulsion pipe (29), and the outer side wall of the lower end of the horseshoe sleeve (22) is in sliding fit with the protection cylinder assembly.

3. The electric control self-setting separate injection well packer according to claim 2, wherein, The lower end of the liner (28) is connected to an inner tube (23). A releasing pin (27) is provided on the advancing tube (29). The releasing pin (27) passes through the inner tube (23) and is fixed to the central cylinder. The inner side of the upper end of the split sleeve (22) is in sliding sealing fit with the outer side of the lower end of the advancing tube (29).

4. The electric-control self-setting and separate-injection well packer according to claim 3, wherein A lock ring hanger (25) is also sleeved on the inner tube (23). The lock ring hanger (25) is located below the advancing tube (29). A lock ring (24) is sleeved on the outer side of the lock ring hanger (25). A setting pin (26) is provided between the lock ring hanger (25) and the inner tube (23).

5. The electric control self-setting injection well packer according to claim 2 or 3, characterized in that, The lower end of the upper joint (39) is connected to the central cylinder. A washing cylinder (38) is connected between the outer side of the upper joint (39) and the outer side of the setting head (35). A washing piston (37) is slidably and sealingly assembled between the outer side of the lower end of the upper joint (39) and the inner side of the washing cylinder (38) as well as between the outer side of the upper end of the setting head (35) and the inner side of the washing cylinder (38). A through hole communicating with the cavity above the washing piston (37) is provided on the upper joint (39). A through hole communicating with the cavity below the washing piston (37) is provided on the washing cylinder (38). A washing channel communicating with the inner side of the washing piston (37) is provided between the setting head (35), the liner (28), and the advancing tube (29).

6. The electric control self-setting injection well packer according to claim 5, wherein, Through holes are provided on the surface of the liner (28) and on the advancing tube (29). When the advancing tube (29) squeezes upward for setting, the through holes on the advancing tube (29) are in communication with the through holes on the liner (28).

7. The electric control self-setting separate injection well packer according to claim 6, characterized in that, The casing assembly includes a lower outer casing (15), a protective sleeve (17), an upper outer casing (19), a sleeve (20), and an outer connecting sleeve (21). The lower end of the lower outer casing (15) is slidably sleeved on the outer side of the advancing body (5). The upper end of the lower outer casing (15) is connected to the upper outer casing (19) through the protective sleeve (17). The upper end of the upper outer casing (19) is connected to the outer connecting sleeve (21) through the sleeve (20). The upper end of the outer connecting sleeve (21) is in sliding sealing fit with the outer side of the lower end of the split sleeve (22) sleeved thereon.

8. The electric control self-setting and separate injection well packer according to claim 7, characterized in that, The central cylinder includes an upper cylinder (36), a connecting ring (18), and a lower cylinder (3). The upper end of the upper cylinder (36) is connected to the lower end of the upper joint (39). The lower end of the upper cylinder (36) is connected to the lower cylinder (3) through the connecting ring (18). The lower end of the lower cylinder (3) is connected to the lower joint (1).

Images