Thermal production well non-stop injection follow-up centering and deviation-adjusting sealing device

Abstract

The invention relates to a thermal production well non-stop injection follow-up centering and deviation adjusting sealing device, which belongs to an oil well mouth device, and comprises a lower sealing shell, an upper sealing shell and a blowout prevention box, the lower end of the upper sealing shell is arranged in an upper opening of the lower sealing shell, an inner follow-up disc I is arranged in the lower sealing shell, an outer follow-up disc I is arranged on the inner follow-up disc I, and an outer follow-up disc II is arranged on the outer follow-up disc I; a spherical lower follow-up sleeve is arranged in the inner follow-up disc I and the outer follow-up disc I, and a lower limiting sleeve is arranged in the lower sealing shell; an inner follow-up disc II is arranged in the upper sealing shell, an outer follow-up disc II is arranged on the inner follow-up disc II, a spherical upper follow-up sleeve is arranged in the inner follow-up disc II and the outer follow-up disc II, an upper limiting sleeve is arranged in an upper port of the upper sealing shell, a blowout prevention box is in threaded connection with the outer wall of the upper end of the upper sealing shell, and a blowout prevention ball is arranged in the blowout prevention box; and the outer wall of the upper sealing shell is sleeved with a material injection disc. All parts of the device are rigidly connected, no sealing ring is arranged, the situation that leakage is caused by aging of the sealing ring is avoided, centering and deviation adjusting can be conducted on a pumping unit without shutdown, and eccentric wear of a sucker rod is prevented.

Description

Technical Field

[0001] The invention belongs to an oil well head device, and mainly relates to a non-stop material injection and follow-up centering and deviation adjustment sealing device for a thermal recovery oil well. Background Art

[0002] The problem of eccentric wear of pumping wells is becoming increasingly prominent. As the wellhead sealing device of the rod pumping unit, the packing box is the weakest link of the whole machine, and its sealing performance is severely affected by eccentric wear. Since it is impossible to achieve absolute precision in the installation of the pumping unit, the misalignment between the wellhead and the bare rod causes serious eccentric wear of the bare rod, which shortens the service life of the packing box and increases power consumption. At the same time, according to statistics, 80% of the rod pumping wells have an axial deviation of 3-10mm, which causes serious eccentric wear of the bare rod packing, thereby reducing the service life of the packing, and even causes the friction between the packing box and the bare rod to cause the bare rod to be scraped. In more serious cases, after the seal is worn, the pressure in the oil well will carry the oil and gas in the well out of the sealing box and pollute the wellhead or well site. At the same time, the existing sealing device requires the well to be stopped to replace the packing, resulting in a long shutdown time.

[0003] The automatic centering and deviation adjustment sealing device for the oil wellhead with announcement number CN114856475A solves the above problems to a certain extent, but its structure is complex, with many components and complicated assembly. The components are sealed by O-rings, which are prone to leakage over time due to aging of the sealing rings. In addition, after the device is centered and deflected, it is in a locked state, making it impossible for the oil pump to achieve follow-up deviation adjustment during normal operation, and there is still a certain degree of bidirectional eccentric wear. Summary of the invention

[0004] The present invention aims to overcome the deficiencies of the prior art and provides a non-stop material injection and centering and deviation adjustment sealing device for thermal oil wells.

[0005] The non-stop material injection and centering and deviation adjustment sealing device for thermal oil wells of the present invention comprises a lower sealing shell, an upper sealing shell and a blowout prevention box, wherein the lower end of the upper sealing shell is placed in the upper opening of the lower sealing shell and is fixedly connected with the lower sealing shell by threads; An inner follower disc I is provided in the middle and lower part of the lower sealing housing, a limiting hole I is provided in the middle of the inner follower disc I, the upper diameter of the limiting hole I is larger than the lower diameter, an outer follower disc I is provided above the inner follower disc I, a limiting hole II is provided in the middle of the outer follower disc I, the upper diameter of the limiting hole II is smaller than the lower diameter; a spherical lower follower sleeve is seated in the limiting hole I, the limiting hole II on the outer follower disc I is clamped on the spherical lower follower sleeve and cooperates with the inner follower disc I, and a lower limiting sleeve is threadedly connected to the upper end of the outer follower disc I in the lower sealing housing; An inner follower disc II is arranged in the upper end of the upper sealing shell, a limiting hole III is arranged in the middle of the inner follower disc II, and the upper diameter of the limiting hole III is larger than the lower diameter; an outer follower disc II is arranged above the inner follower disc II, a limiting hole IV is arranged in the middle of the outer follower disc II, and the upper diameter of the limiting hole IV is smaller than the lower diameter; a spherical upper follower sleeve is seated in the limiting hole III, the limiting hole IV on the outer follower disc II is clamped on the spherical upper follower sleeve and cooperates with the inner follower disc II, an upper limit sleeve is threadedly connected to the upper end of the outer follower disc II in the upper port of the upper sealing shell, a ball rod at the upper end of the spherical upper follower sleeve passes through the upper limit sleeve and is placed outside it, a blowout box is threadedly connected to the outer wall of the upper end of the ball rod, and a blowout ball is arranged in the blowout box; a material injection disc is sleeved on the outer wall of the lower end of the upper sealing shell.

[0006] As a further improvement of the present invention, the lower sealing shell is provided with an enlarged cavity I in the middle and lower part of the cylindrical shell, the lower end of the cavity I is a connecting section, an annular clamping platform is provided at the bottom of the cavity I, the inner follower plate I is seated on the annular clamping platform, an annular groove is provided on the inner follower plate I, and the outer follower plate I is seated in the annular groove.

[0007] As a further improvement of the present invention, the upper sealing shell is provided with an enlarged cavity II at the upper part of the cylindrical shell, an annular clamping platform II is provided at the bottom of the cavity II, the inner follower plate II is seated on the annular clamping platform II, the inner follower plate II is provided with an annular groove, and the outer follower plate II is seated in the annular groove.

[0008] As a further improvement of the present invention, a filling port, a sliding groove, a force hole and a power-assisting hole are provided on the outer wall of the filling plate, and a threaded through hole, a filling port and a limit groove are provided on the outer wall of the upper sealing shell and below the cavity II. The sliding through groove corresponds to the threaded through hole, and an intelligent sealing sensor is threadedly connected in the threaded through hole. The intelligent sealing sensor passes through the sliding through groove and is placed outside it. The force hole corresponds to the limit groove, and a limit pin is provided in the force hole, and a wire plug is provided in the filling port.

[0009] The sealing device for centering and adjusting deviation of hot oil wells without stopping the machine for injection of materials of the present invention has a reasonable structural design, few parts, rigid connection between various parts, no sealing ring, and no leakage caused by aging of the sealing ring; during the normal operation of the pumping unit, the sucker rod will not always remain in the same straight line during the up and down process of the sucker rod, and when the sucker rod deviates, the spherical lower follower sleeve and the spherical upper follower sleeve will move in the direction of the deviation of the sucker rod, so that the pumping unit can be centered and adjusted without stopping, and the centering can be ≤10 mm and the deviation can be ≤2° during operation, effectively preventing the sucker rod from wearing eccentrically; during the operation of the pumping unit, the intelligent sealing sensor can monitor the pressure in the inner cavity of the device in real time and transmit the monitoring results to the monitoring platform, so that the staff can grasp the sealing condition of the sealing filler in the device in real time, which is convenient for the staff to replenish the sealing filler in time, reducing the downtime and improving the output, while also saving material costs, labor costs and operating costs, etc., and reducing the production cost. BRIEF DESCRIPTION OF THE DRAWINGS

[0010] Figure 1 It is a structural cross-sectional view of the present invention; Figure 2 for Figure 1 Middle AA section view; Figure 3 It is a cross-sectional view of the injection plate of the present invention; Figure 4 It is a structural cross-sectional view of the upper sealing shell of the present invention; Figure 5 for Figure 4 Middle BB section view. DETAILED DESCRIPTION

[0011] The non-stop injection and centering and deviation-adjusting sealing device for thermal oil wells of the present invention is applicable to oil wells with an angle of 38-280°, especially to oil wells with an angle of 200-280°, and has better deviation-adjusting, centering and sealing effects. The device comprises a lower sealing shell 1, an upper sealing shell 2 and a blowout prevention box 3, wherein the lower end of the upper sealing shell 2 is placed in the upper opening of the lower sealing shell 1 and is fixedly connected with the lower sealing shell 1 by threads.

[0012] The lower sealing shell 1 is provided with an enlarged cavity Ⅰ22 in the middle and lower part of the cylindrical shell, the lower end of the cavity Ⅰ22 is a connecting section 23, an annular clamping platform 24 is provided at the bottom of the cavity Ⅰ22, an inner follower plate Ⅰ4 is provided in the cavity Ⅰ22, and the inner follower plate Ⅰ4 is seated on the annular clamping platform 24, an annular groove is provided on the inner follower plate Ⅰ4, and an outer follower plate Ⅰ6 is provided in the annular groove; a limiting hole Ⅰ is provided in the middle of the inner follower plate Ⅰ4, the upper diameter of the limiting hole Ⅰ is larger than the lower diameter, and the outer follower plate Ⅰ6 is provided in the inner follower plate Ⅰ4. A limiting hole II is provided in the middle of Ⅰ6, and the upper diameter of the limiting hole II is smaller than the lower diameter. A spherical lower follower sleeve 5 is seated in the limiting hole Ⅰ, and the limiting hole Ⅱ on the outer follower plate Ⅰ6 is clamped on the spherical lower follower sleeve 5 and matched with the inner follower plate Ⅰ4. In the lower sealing housing 1, the upper end of the outer follower plate Ⅰ6 is threadedly connected with a lower positioning sleeve 7 to position it. A through hole Ⅰ is provided at the center of the lower positioning sleeve 7, and the diameter of the through hole Ⅰ is larger than the upper outer diameter of the spherical lower follower sleeve 5 and smaller than the upper outer diameter of the outer follower plate Ⅰ6; The upper sealing shell 2 is provided with an enlarged cavity II 25 at the upper part of the cylindrical shell, an annular clamping platform II 26 is provided at the bottom of the cavity II 25, an inner follower plate II 8 is provided in the cavity II 25, and the inner follower plate II 8 is seated on the annular clamping platform II 26, an annular groove is provided on the inner follower plate II 8, and an outer follower plate II 10 is provided in the annular groove; a limiting hole III is provided in the middle of the inner follower plate II 8, and the upper diameter of the limiting hole III is larger than the lower diameter, and a limiting hole IV is provided in the middle of the outer follower plate II 10, and the upper diameter of the limiting hole IV is smaller than the lower diameter A spherical upper follower sleeve 9 is seated in the limiting hole III, and a limiting hole IV on the outer follower disc II 10 is clamped on the spherical upper follower sleeve 9 and matched with the inner follower disc II 8. An upper positioning sleeve 11 is threadedly connected to the upper end of the outer follower disc II 10 in the upper port of the upper sealing housing 2, and a through hole II is provided at the center of the upper positioning sleeve 11. The diameter of the through hole II is larger than the outer wall of the upper end of the spherical upper follower sleeve 9 and smaller than the outer diameter of the outer follower disc II 10; the ball rod 21 at the upper end of the spherical upper follower sleeve 9 passes through the through hole II on the upper positioning sleeve 11 and is placed outside it; The inner walls of the above-mentioned limiting holes I, II, III and IV are all arc-shaped and matched with the outer wall of the spherical follower sleeve.

[0013] A material injection plate 13 is sleeved on the outer wall of the lower end of the upper sealing shell 2, and two material injection ports 14, a sliding groove 15, two force holes 16 and a force-assisting hole 17 are arranged on the outer wall of the material injection plate 13. A threaded through hole 18, two material injection ports 19 and two limit grooves 20 are arranged on the outer wall of the upper sealing shell 2 below the cavity II 25. The curvature of the sliding through groove 15 is greater than that of the threaded through hole 18, and the sliding through groove 15 corresponds to the threaded through hole 18. An intelligent sealing sensor is threadedly connected to the threaded through hole 18, and the intelligent sealing sensor passes through the sliding through groove 15 and is placed outside it. The intelligent sealing sensor is connected to the external monitoring platform signal, and the staff can receive the information monitored by the intelligent sealing sensor at any time. The force hole 16 corresponds to the limit groove 20, and a limit pin 28 is arranged in the force hole 16, and a wire plug 29 is arranged in the material injection port 14.

[0014] The outer wall of the upper end of the ball rod 21 is threadedly connected with a blowout prevention box 3, and a blowout prevention ball 12 is arranged in the blowout prevention box 3.

[0015] When the present invention is used, the whole device is first connected to the well plug at the well head, and the sucker rod is passed through the center of the whole device, and then, Figure 2 As shown, unscrew the limit pin 28 to release the limit on the injection disk 13, insert the boosting rods into the force hole 16 and the power-assisting hole 17 respectively, hold the boosting rod and rotate the injection disk 13 counterclockwise, and after the injection port 14 corresponds to the feeding port 19, remove the screw plug 29 and inject the sealing filler into the device. When the pressure value monitored by the intelligent sealing sensor reaches 50 MPa, stop adding. At this time, hold the boosting rod and rotate the injection disk 13 clockwise, and after the feeding port 19 is completely blocked, use the screw plug 29 to block the injection port 14 to complete the addition of the sealing filler. At the same time, remove the boosting rods in the force hole 16 and the power-assisting hole 17, screw the limit pin 28 into the force hole 16 so that one end of it is against the bottom of the limit groove 20, and position the injection disk 13 to prevent it from rotating. During the operation of the oil pump, when the intelligent sealing sensor detects that the pressure value of the inner cavity of the device is less than 30 MPa, the monitoring result will be transmitted to the monitoring platform to remind the staff to replenish the sealing filler in time. The staff can use the above method to replenish the sealing filler; during the normal operation of the oil pump, the sucker rod will not always remain in the same straight line during the up and down process. When the sucker rod is offset, the spherical lower follower sleeve 5 and the spherical upper follower sleeve 9 will move in the direction of the sucker rod offset, so that the oil pump can be operated normally without stopping and the centering and deviation can be achieved. The centering can be ≤10 mm and the deviation can be ≤2°, which effectively prevents the eccentric wear of the sucker rod.

Claims

1. Thermal oil well non-stop injection follow-up centering and deviation adjustment sealing device, characterized in that It comprises a lower sealing shell (1), an upper sealing shell (2) and a blowout prevention box (3), wherein the lower end of the upper sealing shell (2) is placed in the upper opening of the lower sealing shell (1) and is threadedly fixedly connected thereto; An inner follower disc I (4) is provided in the middle and lower part of the lower sealing housing (1), a limiting hole I is provided in the middle of the inner follower disc I (4), the upper diameter of the limiting hole I is larger than the lower diameter, an outer follower disc I (6) is provided above the inner follower disc I (4), a limiting hole II is provided in the middle of the outer follower disc I (6), the upper diameter of the limiting hole II is smaller than the lower diameter; a spherical lower follower sleeve (5) is seated in the limiting hole I, the limiting hole II on the outer follower disc I (6) is clamped on the spherical lower follower sleeve (5) and cooperates with the inner follower disc I (4), and a lower limiting sleeve (7) is threadedly connected to the upper ends of the outer follower discs I (6) in the lower sealing housing (1); An inner follower disc II (8) is provided at the upper end of the upper sealing housing (2), and a limit hole III is provided in the middle of the inner follower disc II (8), and the upper diameter of the limit hole III is larger than the lower diameter; an outer follower disc II (10) is provided above the inner follower disc II (8), and a limit hole IV is provided in the middle of the outer follower disc II (10), and the upper diameter of the limit hole IV is smaller than the lower diameter; a spherical upper follower sleeve (9) is seated in the limit hole III, and the limit hole IV on the outer follower disc II (10) is clamped in the spherical upper follower sleeve (9) ) and cooperates with the inner follower disk II (8); an upper limit sleeve (11) is threadedly connected to the upper end of the inner and outer follower disks II (10) at the upper port of the upper sealing shell (2); a ball rod (21) at the upper end of the spherical upper follower sleeve (9) passes through the upper limit sleeve (11) and is placed outside the upper limit sleeve (11); a blowout prevention box (3) is threadedly connected to the outer wall of the upper end of the ball rod (21); a blowout prevention ball (12) is arranged in the blowout prevention box (3); and a material injection plate (13) is sleeved on the outer wall of the lower end of the upper sealing shell (2).

2. The non-stop material injection and centering and deviation adjustment sealing device for thermal oil wells according to claim 1 is characterized in that The lower sealing shell (1) is provided with an enlarged cavity I (22) in the middle and lower part of the cylindrical shell, the lower end of the cavity I (22) is a connecting section (23), an annular clamping platform (24) is provided at the bottom of the cavity I (22), the inner follower plate I (4) is seated on the annular clamping platform (24), the inner follower plate I (4) is provided with an annular groove, and the outer follower plate I (6) is seated in the annular groove.

3. The non-stop material injection and centering and deviation adjustment sealing device for thermal oil wells according to claim 1 is characterized in that The upper sealing shell (2) is provided with an enlarged cavity II (25) at the upper part of the cylindrical shell, an annular clamping platform II (26) is provided at the bottom of the cavity II (25), the inner follower plate II (8) is seated on the annular clamping platform II (26), the inner follower plate II (8) is provided with an annular groove, and the outer follower plate II (10) is seated in the annular groove.

4. The non-stop material injection and centering and deviation adjustment sealing device for thermal oil wells according to claim 1 is characterized in that The outer wall of the injection plate (13) is provided with an injection port (14), a sliding groove (15), a force hole (16) and a force-assisting hole (17); a threaded through hole (18), a feeding port (19) and a limit groove (20) are provided on the outer wall of the upper sealing shell (2) and below the cavity II (25); the sliding groove (15) corresponds to the threaded through hole (18); an intelligent sealing sensor is connected to the inner thread of the threaded through hole (18); the intelligent sealing sensor passes through the sliding groove (15) and is placed outside the sliding groove; the force hole (16) corresponds to the limit groove (20), and a limit pin (28) is provided in the force hole (16); and a screw plug (29) is provided in the injection port (14).

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