Energy-saving type plug removal and injection increasing device

Abstract

An energy-saving unblocking and injection enhancement device relates to the field of oil production technology. The upper part of a protective tube blocks the piezoelectric ceramic tube, and the lower part of the protective tube is connected to a transfer tube with a clearance fit. The transfer tube is located below the piezoelectric ceramic tube, and a lower pressure cap is provided at the lower part of the transfer tube. A lower buffer pad is sandwiched between the lower pressure cap and the transfer tube. An upper pressure cap is provided at the upper part of a boss, and an upper buffer pad is sandwiched between the upper pressure cap and the boss. The upper and lower pressure caps are connected by double-ended bolts. The beneficial effects of this invention are: by setting an upper buffer pad above the protective tube and a lower buffer pad below the transfer tube, the L-shaped buffer pads buffer the end faces and outer circles of the protective tube and the transfer tube, absorbing the impact and vibration transmitted from the axial and radial directions, reducing the impact on the piezoelectric ceramic tube, and improving its service life. The piezoelectric ceramic tube, protective tube, and piezoelectric ceramic positive electrode are assembled using cryogenic assembly, which prevents damage to the piezoelectric ceramic tube during assembly.

Description

Technical Field

[0001] This utility model relates to the field of oil production technology, and in particular to an energy-saving unblocking and injection enhancement device. Background Technology

[0002] Currently, oilfield unblocking and injection enhancement devices use high-power ultrasonic transducers. Since the electroacoustic conversion materials used are piezoelectric ceramics, which are brittle and easily damaged by impacts, most systems suspend the piezoelectric ceramics within a protective tube to prevent damage. However, the gap between the suspended ceramic string and the protective tube is filled with silicone oil. Because the sound velocities of the silicone oil and the protective tube differ significantly, the ultrasonic waves emitted by the piezoelectric ceramics have low propagation efficiency during unblocking operations, resulting in poor unblocking and injection enhancement effects.

[0003] Application number CN 108131117 A discloses a high-power ultrasonic transducer, which eliminates the obstruction of the intermediate medium by assembling the protective cylinder, piezoelectric ceramic and piezoelectric ceramic positive electrode through interference fit, thereby greatly improving the ultrasonic propagation efficiency.

[0004] However, the problem with interference fit assembly is that the piezoelectric ceramic and the protective tube become a single structure in terms of strength. When the protective tube is subjected to external impact and vibration, the piezoelectric ceramic will inevitably be affected at the same time, which can easily damage the brittle piezoelectric ceramic and reduce its service life. Utility Model Content

[0005] To address the problems of low ultrasonic wave propagation efficiency, high energy consumption, and short service life in existing oilfield unblocking and injection enhancement devices, this utility model provides an energy-saving unblocking and injection enhancement device.

[0006] The technical solution provided by this utility model is: an energy-saving unblocking and injection device, including a protective tube, a piezoelectric ceramic tube inside the protective tube, a piezoelectric ceramic positive electrode inside the piezoelectric ceramic tube, the protective tube and the piezoelectric ceramic tube being connected by an interference fit, the piezoelectric ceramic tube and the piezoelectric ceramic positive electrode being connected by an interference fit, the upper part of the protective tube blocking above the piezoelectric ceramic tube, a cylindrical boss extending from the upper part of the protective tube, a transfer tube being connected to the lower part of the protective tube by a clearance fit, the transfer tube being located below the piezoelectric ceramic tube, a lower pressure cap being provided at the lower part of the transfer tube, a lower buffer pad being sandwiched between the lower pressure cap and the transfer tube, an upper pressure cap being provided at the upper part of the boss, an upper buffer pad being sandwiched between the upper pressure cap and the boss, the upper pressure cap and the lower pressure cap being connected by double-headed bolts, the number of double-headed bolts being four, the four double-headed bolts being evenly arranged around the circumference;

[0007] Both the upper and lower buffer pads are L-shaped ring structures. The upper buffer pad wraps around the outer circle and upper end face of the boss, and the lower buffer pad wraps around the outer circle and lower end face of the adapter pipe. Both the upper and lower buffer pads are made of rubber.

[0008] The upper pressure cap extends upward into a sealing groove. Both the upper pressure cap and the protective tube have a central hole. A cable is installed in the central hole. The copper wire of the cable is electrically connected to the positive electrode of the piezoelectric ceramic through a conductor. The cable passes through the protective tube and the upper pressure cap. At the sealing groove, the cable is covered with a conical sleeve made of rubber. A lifting cap is connected to the sealing groove by a thread. The lifting cap has a central hole in its center. The cable extends out of the lifting cap. The outer diameter of the lifting cap is larger than the sealing groove. Tightening the lifting cap can seal the conical sleeve and the cable.

[0009] The lower buffer pad extends downwards to form a pressure balance cap, and the lower pressure cover extends downwards to form a protective cap. The protective cap has an inlet hole, and the space above the pressure balance cap is filled with silicone oil.

[0010] The upper part of the protective tube blocks the piezoelectric ceramic tube, and the adapter tube is located below the piezoelectric ceramic tube. Instead, an upper gasket is sandwiched between the protective tube and the piezoelectric ceramic tube, and a lower gasket is sandwiched between the adapter tube and the piezoelectric ceramic tube. Both the upper and lower gaskets are made of rubber.

[0011] The piezoelectric ceramic tube, protective tube, and piezoelectric ceramic positive electrode are assembled using cryogenic methods.

[0012] The beneficial effects of this utility model are as follows: the protective tube and the piezoelectric ceramic tube are connected by an interference fit, resulting in high ultrasonic transmission efficiency and low energy consumption. By setting an upper buffer pad above the protective tube and a lower buffer pad below the adapter tube, the L-shaped buffer pads provide a buffering effect on the end faces and outer circles of the protective tube and the adapter tube, absorbing the impact and vibration transmitted from the axial and radial directions, reducing the impact on the piezoelectric ceramic tube, and improving its service life. The piezoelectric ceramic tube, the protective tube, and the piezoelectric ceramic positive electrode are assembled by cryogenic assembly, which will not damage the piezoelectric ceramic tube during the assembly process. Attached Figure Description

[0013] Appendix Figure 1 This is a schematic diagram of the structure of this utility model.

[0014] In the diagram, 1-protective tube, 101-boss, 2-piezoelectric ceramic tube, 3-piezoelectric ceramic positive electrode, 4-upper pressure cap, 401-sealing groove, 5-lower pressure cap, 501-protective cap, 502-liquid inlet, 6-lower buffer pad, 601-pressure balance cap, 7-upper buffer pad, 8-adapter pipe, 9-double-ended bolt, 10-wire, 11-copper wire, 12-cable, 13-lifting cap, 14-conical sleeve, 15-upper gasket, 16-lower gasket. Detailed Implementation

[0015] like Figure 1As shown, an energy-saving unblocking and injection device includes a protective tube 1, a piezoelectric ceramic tube 2 inside the protective tube 1, a piezoelectric ceramic positive electrode 3 inside the piezoelectric ceramic tube 2, the protective tube 1 and the piezoelectric ceramic tube 2 are connected by an interference fit, the piezoelectric ceramic tube 2 and the piezoelectric ceramic positive electrode 3 are connected by an interference fit, the upper part of the protective tube 1 blocks above the piezoelectric ceramic tube 2, a cylindrical boss 101 extends from the upper part of the protective tube 1, the lower part of the protective tube 1 is connected by a transfer pipe 8 with a clearance fit, the transfer pipe 8 is located below the piezoelectric ceramic tube 2, the lower part of the transfer pipe 8 is provided with a lower pressure cap 5, a lower buffer pad 6 is sandwiched between the lower pressure cap 5 and the transfer pipe 8, the upper part of the boss 101 is provided with an upper pressure cap 4, an upper buffer pad 7 is sandwiched between the upper pressure cap 4 and the boss 101, the upper pressure cap 4 and the lower pressure cap 5 are connected by double-headed bolts 9, the number of double-headed bolts 9 is four, and the four double-headed bolts 9 are evenly arranged around the circumference;

[0016] Both the upper buffer pad 7 and the lower buffer pad 6 are L-shaped ring structures. The upper buffer pad 7 wraps around the outer circle and the upper end face of the boss 101, and the lower buffer pad 6 wraps around the outer circle and the lower end face of the adapter pipe 8. Both the upper buffer pad 7 and the lower buffer pad 6 are made of rubber.

[0017] The upper pressure cover 4 extends upward into a sealing groove 401. Both the upper pressure cover 4 and the protective tube 1 have a central hole. A cable 12 is installed in the central hole. The copper wire 11 of the cable 12 is electrically connected to the piezoelectric ceramic positive electrode 3 through the conductor 10. The cable 12 passes through the protective tube 1 and the upper pressure cover 4. At the sealing groove 401, the cable 12 is covered with a conical sleeve 14, which is made of rubber. The sealing groove 401 is connected to a lifting cap 13 by a thread. The lifting cap 13 has a central hole. The cable 12 extends out of the lifting cap 13. The outer diameter of the lifting cap 13 is larger than that of the sealing groove 401. Tightening the lifting cap 13 can seal the conical sleeve 14 and the cable 12.

[0018] The lower buffer pad 6 extends downward to a pressure balance cap 601, and the lower pressure cover 5 extends downward to a protective cap 501. The protective cap 501 has a liquid inlet hole 502, and the space above the pressure balance cap 601 is filled with silicone oil.

[0019] The upper part of the protective tube 1 blocks the piezoelectric ceramic tube 2, and the adapter tube 8 is located below the piezoelectric ceramic tube 2. Instead, an upper gasket 15 is sandwiched between the protective tube 1 and the piezoelectric ceramic tube 2, and a lower gasket 16 is sandwiched between the adapter tube 8 and the piezoelectric ceramic tube 2. Both the upper gasket 15 and the lower gasket 16 are made of rubber, which further plays a buffering role, reduces the impact on the piezoelectric ceramic tube 2, and improves its service life.

[0020] The piezoelectric ceramic tube 2, the protective tube 1, and the piezoelectric ceramic positive electrode 3 are assembled by cryogenic assembly, that is, the piezoelectric ceramic tube 2 is cooled to -200 to 220°C. At this time, the outer circle of the piezoelectric ceramic tube 2 shrinks and the inner diameter expands, so the three can be assembled smoothly without knocking.

Claims

1. An energy-saving unblocking and injection device, comprising a protective tube (1), characterized in that: The protective tube (1) contains a piezoelectric ceramic tube (2), and the piezoelectric ceramic tube (2) contains a piezoelectric ceramic positive electrode (3). The protective tube (1) and the piezoelectric ceramic tube (2) are connected by an interference fit, and the piezoelectric ceramic tube (2) and the piezoelectric ceramic positive electrode (3) are connected by an interference fit. The upper part of the protective tube (1) is positioned above the piezoelectric ceramic tube (2). A cylindrical boss (101) extends from the upper part of the protective tube (1). The lower part of the protective tube (1) is connected by a transfer tube (8) with a clearance fit. Located below the piezoelectric ceramic tube (2), the lower part of the adapter tube (8) is provided with a lower pressure cover (5), and a lower buffer pad (6) is sandwiched between the lower pressure cover (5) and the adapter tube (8). The upper part of the boss (101) is provided with an upper pressure cover (4), and an upper buffer pad (7) is sandwiched between the upper pressure cover (4) and the boss (101). The upper pressure cover (4) and the lower pressure cover (5) are connected by double-headed bolts (9). There are four double-headed bolts (9), and the four double-headed bolts (9) are evenly arranged around the circumference. The upper buffer pad (7) and the lower buffer pad (6) are both L-shaped ring structures. The upper buffer pad (7) wraps around the outer circle and the upper end face of the boss (101), and the lower buffer pad (6) wraps around the outer circle and the lower end face of the adapter pipe (8). Both the upper buffer pad (7) and the lower buffer pad (6) are made of rubber. The upper pressure cap (4) extends upward into a sealing groove (401). The upper pressure cap (4) and the protective tube (1) both have a central hole. A cable (12) is installed in the central hole. The copper wire (11) of the cable (12) is electrically connected to the positive electrode (3) of the piezoelectric ceramic through the conductor (10). The cable (12) passes through the protective tube (1) and the upper pressure cap (4). At the sealing groove (401), the cable (12) is covered with a conical sleeve (14). The conical sleeve (14) is made of rubber. The sealing groove (401) is connected to the lifting cap (13) by a thread. The lifting cap (13) has a central hole. The cable (12) extends out of the lifting cap (13). The outer diameter of the lifting cap (13) is larger than that of the sealing groove (401). Tightening the lifting cap (13) can seal the conical sleeve (14) and the cable (12). The lower buffer pad (6) extends downward to a pressure balance cap (601), and the lower pressure cap (5) extends downward to a protective cap (501). The protective cap (501) has an inlet hole (502), and the space above the pressure balance cap (601) is filled with silicone oil.

2. The energy-saving unblocking and injection device according to claim 1, characterized in that: The upper part of the protective tube (1) is positioned above the piezoelectric ceramic tube (2), and the adapter tube (8) is located below the piezoelectric ceramic tube (2). Instead, an upper gasket (15) is sandwiched between the protective tube (1) and the piezoelectric ceramic tube (2), and a lower gasket (16) is sandwiched between the adapter tube (8) and the piezoelectric ceramic tube (2). Both the upper gasket (15) and the lower gasket (16) are made of rubber.

3. The energy-saving unblocking and injection device according to claim 1, characterized in that: The piezoelectric ceramic tube (2), the protective tube (1), and the piezoelectric ceramic positive electrode (3) are assembled using cryogenic assembly.

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