Deviation-following centralizing packing box

Abstract

The utility model discloses a deviation-following centralizing packing box, which relates to the technical field of oil field oil extraction operation and comprises a centralizing mechanism positioned at the top of the packing box. The centralizing mechanism is provided with a centralizing block; the centralizing block is mounted on the outer side of the polish rod; the centralizing block is arranged in the centralizing adjusting box; the bottom of the righting adjusting box abuts against the gland. The top ends of the centralizing block and the centralizing adjusting box are fixed in a spinning mode through a centralizing pressing cap. A second locking ring part is mounted on the side of the righting adjusting box; the righting adjusting box is connected to the top end of the packing box pressing cap in a screwed mode, and the righting adjusting box is locked to the packing box pressing cap through the second locking ring part. The rubber sleeve is positioned between the packing box shell and the spiral packing; the bottom of the rubber sleeve extends to the bottom wall of the packing box shell; the rubber sleeve in the device is of a bottom support type and cannot move up and down along with the polish rod, damage caused by back-and-forth stretching is avoided, and the service life of the rubber sleeve is prolonged; the centering mechanism ensures that the packing in the packing box is centered with the polish rod, side pressure borne by the rubber sleeve is reduced, and the service life of the packing and the service life of the rubber sleeve are prolonged.

Description

Technical Field

[0001] The utility model relates to the technical field of oil field production operations, in particular to a heel-centering packing box. Background Art

[0002] At present, the wellhead seal of oil wells adopts rigid stuffing box. Rubber or cloth rubber ring is added to the stuffing box. A gland and a packing cap are arranged on the upper part of the stuffing box. The packing cap is connected to the outer wall of the stuffing box by threads. The packing cap is rotated downward, which drives the gland to press down and deform the packing in the stuffing box to produce a sealing effect.

[0003] A Chinese utility model patent, with the announcement number CN216922068U, discloses a manual and automatic oil wellhead packing box, comprising a joint, a heel bias cap, and a heel bias disc, wherein the heel bias disc is partially located between the heel bias cap and the joint, and the heel bias disc can move with the light rod in the horizontal direction; the packing box also comprises a light rod and a packing box shell extending axially along the packing box; a stuffing box joint is embedded in the upper part of the packing box shell, and an elastic stuffing box is provided between the stuffing box joint and the light rod; a spiral packing is provided on the outer periphery of the part of the light rod placed in the packing box shell; a slope is provided at the lower part of the packing box shell, and a pressing block is held at the lower part of the stuffing box joint, and the pressing block can slide along the slope to press the elastic stuffing box; the packing box adopts an elastic stuffing box instead of a rigid stuffing box, and utilizes the back pressure of the wellhead to drive the pressing block to act on the outer surface of the elastic stuffing box, thereby acting on the packing, thereby ensuring a lasting sealing effect, and can ensure a long-term sealing without manual adjustment.

[0004] Compared with the above patents, the existing packing box still has the following problems:

[0005] 1. When the bare pole goes up or down, the rubber sleeve will be repeatedly pulled, and the rubber sleeve will be easily fatigued and damaged in the long run;

[0006] 2. In actual production, due to the quality of the pumping unit installation and the quality of the oil well foundation, the wellhead alignment will deviate. Over time, the deviation becomes more and more serious, with the deviation reaching tens of centimeters to dozens of centimeters, and even to the point where it is impossible to pump;

[0007] Therefore, in view of the problems existing in the above-mentioned existing oil well wellhead packing boxes, a device is designed to solve the above-mentioned problems by eliminating the need for repeated pulling of the rubber sleeve, preventing the rubber sleeve from being damaged due to fatigue, and allowing the packing in the packing box to be effectively aligned with the polished rod, thereby further extending the service life of the rubber sleeve and the packing and improving the reliability of the packing box. Utility Model Content

[0008] The utility model aims to provide a packing box with optimized structure, in which the rubber sleeve will not be damaged due to fatigue, the packing in the packing box and the polished rod can be effectively aligned, the service life of the rubber sleeve and the packing is further extended, and the reliability of the packing box is improved.

[0009] In order to achieve the above purpose, the utility model provides the following technical solutions:

[0010] The heel-centering packing box comprises a lower joint, a heel-centering pressure cover and a heel-centering plate, wherein the upper surface of the lower end of the heel-centering plate is pressed by the heel-centering pressure cover, the heel-centering plate part is located between the heel-centering pressure cover and the lower joint, the heel-centering plate is sleeved on the outside of the polished rod, and the heel-centering plate can move with the polished rod in the horizontal direction, the polished rod part is placed in the packing box shell, and the outer periphery of the part of the polished rod located in the packing box shell is installed with a spiral packing, wherein the upper end of the packing box shell is threadedly connected with a packing box pressure cap, and the lower end of the packing box shell is screwed on the heel-centering plate through a thread, a locking ring is installed at the bottom end of the upper thread of the heel-centering plate, a self-sealing ring is installed between the upper end of the heel-centering plate and the packing box shell, the lower end of the spiral packing has a bottom support sleeved on the outer periphery of the polished rod, the upper end of the spiral packing has a gland sleeved on the outer periphery of the polished rod, a heel-centering sealing ring is embedded on the inner side of the lower joint, and also comprises:

[0011] A righting mechanism, the righting mechanism being located on the top of the packing box;

[0012] The righting mechanism comprises a righting block;

[0013] The straightening block is installed on the outside of the polished rod;

[0014] The straightening block is placed in the straightening adjustment box;

[0015] The bottom of the straightening and adjusting box abuts against the gland;

[0016] The top ends of the straightening block and the straightening adjustment box are fixed by spinning through a straightening pressure cap;

[0017] Two locking rings are installed on the sides of the straightening and adjusting box;

[0018] The said centering adjustment box is screwed to the top of the packing box pressure cap, and the centering adjustment box is locked on the packing box pressure cap through two locking rings;

[0019] A rubber sleeve, the rubber sleeve is located between the packing box shell and the spiral packing;

[0020] The bottom of the rubber sleeve extends to the bottom wall of the packing box shell.

[0021] Furthermore, the sides where the straightening block and the straightening adjustment box are in contact are respectively formed with beveled edges to facilitate installation of the straightening block when the polished rod is deflected.

[0022] Furthermore, the straightening pressure cap has a stepped structure;

[0023] The straightening pressure cap is partially embedded and installed on the top of the straightening block and the straightening adjustment box, and the other part of the straightening pressure cap extends to the outside of the straightening adjustment box.

[0024] Furthermore, the upper and lower side ends of the packing box pressure cap are respectively screwed and fixed on the outer sides of the centralizing adjustment box and the packing box shell;

[0025] A groove is formed between the packing box pressure cap and the straightening pressure cap;

[0026] The second locking ring part is located in the groove.

[0027] Furthermore, the interior of the rubber sleeve is filled;

[0028] A rubber sleeve joint is bonded to the outer side of the upper end of the rubber sleeve;

[0029] The top ends of the rubber sleeve and the rubber sleeve joint abut against the packing box pressure cap;

[0030] The outer side of the rubber sleeve joint is attached to the inner wall of the packing box shell;

[0031] An inner cavity is formed inside the packing box shell;

[0032] A rubber sleeve sealing ring is installed in the inner cavity;

[0033] The rubber sleeve sealing ring is installed between the rubber sleeve joint and the packing box shell.

[0034] Furthermore, the upper end of the rubber sleeve extends upward to the outside of the gland;

[0035] The bottom of the rubber sleeve is located between the bottom support and the packing box shell.

[0036] Furthermore, the straightening block is made of engineering plastics.

[0037] In the above technical solution, the heel-centering packing box of the utility model has the following beneficial effects:

[0038] 1. The utility model designs the packing box for heel-biased straightening. After the rubber sleeve is changed to a bottom-supporting type, the rubber sleeve will not move up and down with the bare rod, thus avoiding damage caused by stretching back and forth and extending the service life of the rubber sleeve;

[0039] 2. The packing box designed by the utility model has an additional centering mechanism, which can ensure that the packing in the packing box is aligned with the polished rod no matter how deflected the wellhead is, thereby reducing the lateral pressure on the rubber sleeve and extending the service life of the packing and the rubber sleeve. BRIEF DESCRIPTION OF THE DRAWINGS

[0040] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings required for use in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments recorded in the present utility model. For ordinary technicians in this field, other drawings can also be obtained based on these drawings.

[0041] Figure 1 A schematic structural diagram of a heel-centering packing box provided in an embodiment of the utility model.

[0042] Description of reference numerals:

[0043] 1. Lower joint; 2. Heel bias pressure cover; 3. Heel bias plate; 4. Bare rod; 5. Packing box shell; 6. Spiral packing; 7. Packing box pressure cap; 8. Part of locking ring; 9. Self-sealing ring; 10. Bottom support; 11. Gland; 12. Heel bias sealing ring; 13. Righting mechanism; 14. Rubber sleeve; 15. Rubber sleeve joint; 16. Rubber sleeve sealing ring;

[0044] 131. Straightening block; 132. Straightening adjustment box; 133. Straightening pressure cap; 134. Second part of locking ring; 135. Bevel part. DETAILED DESCRIPTION

[0045] In order to enable those skilled in the art to better understand the technical solution of the present invention, the present invention will be further described in detail below in conjunction with the accompanying drawings.

[0046] It should be noted that the terms "outside", "top", "exterior", "periphery", "side", "inner periphery" and the like used herein indicate positions or positional relationships based on the positions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description. Similar expressions are only for the purpose of illustration, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention. In addition, the terms "one part", "two parts" and the like are only used for descriptive purposes and cannot be understood as indicating or implying relative importance.

[0047] See also Figure 1 As shown;

[0048] The heel-centering packing box comprises a lower joint 1, a heel-centering pressure cover 2, and a heel-centering plate 3. The upper surface of the lower end of the heel-centering plate 3 is pressed by the heel-centering pressure cover 2. The heel-centering plate 3 is partially located between the heel-centering pressure cover 2 and the lower joint 1. The heel-centering plate 3 is sleeved on the outside of the polished rod 4, and the heel-centering plate 3 can move along the horizontal direction with the polished rod 4. The polished rod 4 is partially placed in the packing box shell 5, and the outer periphery of the part of the polished rod 4 located in the packing box shell 5 is installed with a spiral packing 6, wherein the packing box shell 5 The upper end of the packing box is threadedly connected with a packing box pressure cap 7, and the lower end of the packing box housing 5 is screwed on the follow-up disc 3 through a thread, a locking ring 8 is installed at the bottom end of the upper thread of the follow-up disc 3, a self-sealing ring 9 is installed between the upper end of the follow-up disc 3 and the packing box housing 5, the lower end of the spiral packing 6 has a bottom support 10 sleeved on the outer periphery of the polished rod 4, the upper end of the spiral packing 6 has a gland 11 sleeved on the outer periphery of the polished rod 4, and a follow-up sealing ring 12 is embedded on the inner side of the lower joint 1, and also includes:

[0049] A straightening mechanism 13, the straightening mechanism 13 is located at the top of the packing box;

[0050] The righting mechanism 13 has a righting block 131;

[0051] The straightening block 131 is installed on the outside of the polished rod 4;

[0052] The straightening block 131 is placed in the straightening adjustment box 132;

[0053] The bottom of the righting and adjusting box 132 abuts against the gland 11;

[0054] The top ends of the straightening block 131 and the straightening adjustment box 132 are fixed by spinning through the straightening pressure cap 133;

[0055] The side of the straightening and adjusting box 132 is provided with a second locking ring 134;

[0056] The centering adjustment box 132 is screwed to the top of the packing box pressure cap 7, and the centering adjustment box 132 is locked on the packing box pressure cap 7 through the second locking ring 134;

[0057] The rubber sleeve 14 is located between the packing box housing 5 and the spiral packing 6;

[0058] The bottom of the rubber sleeve 14 extends to the bottom wall of the packing box housing 5 .

[0059] Specifically, the packing box with eccentricity is optimized in design compared with the packing box in the prior art, in which the rubber sleeve 14 (i.e., the elastic stuffing box) is changed from an upper hanging type to a bottom supporting type, the rubber sleeve 14 is located between the packing box shell 5 and the spiral packing 6, and the spiral packing 6 is installed in the elastic stuffing box to tightly embrace the polished rod 4 to achieve the purpose of sealing the polished rod 4 and the oil pipe annulus; there is a distance between the bottom of the upper hanging rubber sleeve 14 and the packing box shell 5 to compensate for the natural elongation of the spiral packing 6 after wear, but when the polished rod 4 goes down, it will bring The moving spiral packing 6 stretches the rubber sleeve 14 downward, and when the bare rod 4 moves upward, the rubber sleeve 14 will restore its original length. Over time, the rubber sleeve 14 is prone to fatigue damage. After the rubber sleeve 14 is changed to a bottom-supporting type, the bottom of the rubber sleeve 14 is extended to the bottom wall of the packing box shell 5. At this time, the rubber sleeve 14 will only bear pressure, so it will not be damaged due to fatigue, which prolongs the service life of the rubber sleeve 14 and improves the reliability of the packing box. The compensation of the natural elongation of the spiral packing 6 after wear is achieved by rotating the upward of the straightening adjustment box 132 arranged at the top.

[0060] Furthermore, a packing box is provided to correct the deviation. The packing box has a correcting mechanism 13 added thereto. In actual production, due to the quality of the installation of the pumping unit and the quality of the oil well foundation, there will be some deviations in the wellhead alignment. These deviations may become more and more serious over time. It is not uncommon for wells to have a deviation of more than ten centimeters or even dozens of centimeters (generally, the deviation can only be adjusted by 2-3 centimeters). Some oil wells are even unable to be pumped. Based on this, a correcting mechanism 13 is added to the top of the packing box. The correcting mechanism 13 consists of a correcting block 131, a correcting adjustment box 132, a correcting pressure cap 133 and two locking ring parts 134. The correcting block 131 is tightly attached to the outer side of the light rod 4, and the correcting adjustment box 132 is against the outer side of the correcting block 131. The correcting adjustment box 132 The bottom of the straightening block 131 rests on the gland 11, and the upper ends of the straightening block 131 and the straightening adjustment box 132 are jointly equipped with a straightening pressure cap 133, and the straightening pressure cap 133 is fixedly installed on the upper end of the straightening adjustment box 132 to fix and limit the straightening block 131. The second locking ring 134 is installed on the outer side of the straightening adjustment box 132. The straightening adjustment box 132 is both a shell for accommodating the straightening block 131 and a component for adjusting the length of the packing. After adjusting to the right position, it is locked with the second locking ring 134 to prevent the straightening adjustment box 132 from being reversed during operation; after adding the straightening mechanism 13, no matter how skewed the wellhead is, the spiral packing 6 in the packing box and the polished rod 4 can be guaranteed to be aligned, thereby extending the service life of the packing, eliminating and reducing the lateral pressure on the rubber sleeve 14, and extending the life of the rubber sleeve 14.

[0061] A beveled edge 135 is formed on one side where the straightening block 131 and the straightening adjustment box 132 are in contact with each other, so as to be used for installing the straightening block 131 when the polished rod 4 is deflected.

[0062] Specifically, the straightening adjustment box 132 is a shell for housing the straightening block 131, and the straightening adjustment box 132 supports and fixes the straightening block 131. At the connection below the two, the straightening adjustment box 132 and the straightening block 131 are both provided with a bevel portion 135 to facilitate the installation and replacement of the straightening block 131. The straightening block 131 is placed in the straightening pressure cap 133, with a small amount of space above and below. When the straightening pressure cap 133 needs to bear the entire load of the light rod 4, it is directly seated on the straightening adjustment box 132, and the straightening block 131 is not under pressure at this time.

[0063] The straightening pressure cap 133 has a stepped structure;

[0064] A portion of the straightening pressure cap 133 is embedded and installed on the top of the straightening block 131 and the straightening adjustment box 132 , and another portion of the straightening pressure cap 133 extends to the outside of the straightening adjustment box 132 .

[0065] Specifically, the installation height of the straightening block 131 is slightly higher than the straightening adjustment box 132, and the ends of the two are installed with straightening pressure caps 133, which have an L-shaped structure. The inner corners of the straightening pressure cap 133 are arranged in a stepped shape to match the height difference formed by the straightening block 131 and the straightening adjustment box 132, so that the straightening block 131 can be replaced more conveniently, and the outer corners of the straightening pressure cap 133 extend toward the direction of the light rod 4 and downward, respectively, and the part extending downward is screwed on the outside of the straightening adjustment box 132, thereby fixing the positions of the straightening block 131 and the straightening adjustment box 132.

[0066] The upper and lower ends of the packing box pressure cap 7 are respectively fixed on the outer sides of the centering adjustment box 132 and the packing box housing 5 by rotation;

[0067] A groove is formed between the packing box pressure cap 7 and the straightening pressure cap 133;

[0068] The second locking ring portion 134 is located in the groove.

[0069] Specifically, packing box pressure cap 7 is installed on the outer side of packing box shell 5 and straightening and adjusting box 132, and the two ends of packing box pressure cap 7 are respectively attached to packing box shell 5 and straightening and adjusting box 132, and there is space between the upper end of packing box pressure cap 7 and the lower end of straightening and adjusting box 133, and the space forms a groove, and the second part of locking ring 134 is installed in the groove, and the straightening and adjusting box 132 is locked and fixed by the second part of locking ring 134, so as to prevent the occurrence of buckling.

[0070] The inside of the rubber sleeve 14 is filled;

[0071] A rubber sleeve joint 15 is bonded to the outer side of the upper end of the rubber sleeve 14;

[0072] The top ends of the rubber sleeve 14 and the rubber sleeve joint 15 abut against the packing box pressure cap 7;

[0073] The outer side of the rubber sleeve joint 15 is attached to the inner wall of the packing box housing 5;

[0074] An inner cavity is formed inside the packing box housing 5;

[0075] A rubber sleeve sealing ring 16 is installed in the inner cavity;

[0076] The rubber sleeve sealing ring 16 is installed between the rubber sleeve joint 15 and the packing box housing 5 .

[0077] The upper end of the rubber sleeve 14 extends upward to the outside of the gland 11;

[0078] The bottom of the rubber sleeve 14 is located between the base 10 and the packing box housing 5 .

[0079] Specifically, the inside of the rubber sleeve 14 is solid, and when the bare rod 4 moves downward, the rubber sleeve 14 can provide good support to prevent the rubber sleeve 14 from being deformed; the rubber sleeve 14 has three sections, the upper, middle and lower sections, wherein the upper sections of the rubber sleeve 14 are respectively fitted between the gland 11 and the rubber sleeve joint 15, wherein the rubber sleeve joint 15 is bonded to form a whole with the rubber sleeve 14, and the top ends of the rubber sleeve 14 and the rubber sleeve joint 15 are abutted against the packing box pressure cap 7, and the outer side of the rubber sleeve joint 15 is fitted on the inner wall of the packing box shell 5, and a rubber sleeve sealing ring 16 is installed on the outer side of the rubber sleeve joint 15, and the rubber sleeve sealing ring 16 is installed on the side of the packing box shell 5 close to the rubber sleeve joint 15, and the rubber sleeve 14 is sealed and installed by the rubber sleeve sealing ring 16;

[0080] The middle section of the rubber sleeve 14 is located between the spiral packing 6 and the packing box shell 5, and the lower section of the rubber sleeve 14 extends downward to the bottom inner wall of the packing box shell 5. The bottom ends of the lower section of the rubber sleeve 14 are respectively located between the base 10 and the packing box shell 5. When the bare rod 4 moves downward, the bottom of the rubber sleeve 14 is subjected to the force from the spiral packing 6 squeezing the base 10, which is directly transmitted to the bottom wall of the packing box shell 5. When the bare rod 4 moves upward, the friction force of the spiral packing 6 is transmitted upward to the gland 11 and the straightening adjustment box 132, and is pressed by the packing pressure cap 7. The rubber sleeve 14 will not be pulled, and even after long-term use, the rubber sleeve 14 will not be damaged due to fatigue, thereby extending the service life of the rubber sleeve 14.

[0081] Specifically, the straightening block 131 is made of engineering plastics, which have excellent comprehensive properties such as wear resistance, self-lubrication, impact resistance, and aging resistance, and are suitable for practical use.

[0082] The above only describes some exemplary embodiments of the present invention by way of illustration. It is undoubted that those skilled in the art can modify the described embodiments in various ways without departing from the spirit and scope of the present invention. Therefore, the above drawings and descriptions are illustrative in nature and should not be construed as limiting the scope of protection of the claims of the present invention.

Claims

1. A heel-centering packing box, comprising a lower joint (1), a heel-centering pressure cover (2), and a heel-centering plate (3), wherein the upper surface of the lower end of the heel-centering plate (3) is pressed by the heel-centering pressure cover (2), the heel-centering plate (3) is partially located between the heel-centering pressure cover (2) and the lower joint (1), the heel-centering plate (3) is sleeved on the outside of a polished rod (4), and the heel-centering plate (3) can move along the horizontal direction with the polished rod (4), the polished rod (4) is partially placed in a packing box housing (5), and a spiral packing (6) is installed on the outer periphery of the part of the polished rod (4) located in the packing box housing (5), wherein the packing box housing ( The upper end of the spiral packing (6) is threadedly connected to a packing box pressure cap (7), and the lower end of the packing box shell (5) is screwed onto the heel plate (3) through a thread, a locking ring portion (8) is installed at the bottom end of the upper thread of the heel plate (3), a self-sealing ring (9) is installed between the upper end of the heel plate (3) and the packing box shell (5), the lower end of the spiral packing (6) has a base (10) sleeved on the outer periphery of the light rod (4), the upper end of the spiral packing (6) has a gland (11) sleeved on the outer periphery of the light rod (4), and a heel sealing ring (12) is embedded on the inner side of the lower joint (1), characterized in that: Also includes: A straightening mechanism (13), wherein the straightening mechanism (13) is located on the top of the packing box; The straightening mechanism (13) comprises a straightening block (131); The straightening block (131) is installed on the outside of the polished rod (4); The straightening block (131) is placed in the straightening adjustment box (132); The bottom of the straightening and adjusting box (132) abuts against the gland (11); The top ends of the straightening block (131) and the straightening adjustment box (132) are fixed by means of a straightening pressure cap (133) through rotation. Two locking rings (134) are installed on the sides of the straightening and adjusting box (132); The centering adjustment box (132) is screwed to the top of the packing box pressure cap (7), and the centering adjustment box (132) is locked on the packing box pressure cap (7) through the second locking ring (134); A rubber sleeve (14), wherein the rubber sleeve (14) is located between the packing box housing (5) and the spiral packing (6); The bottom of the rubber sleeve (14) extends to the bottom wall of the packing box housing (5).

2. The packing box for centering the heel according to claim 1, characterized in that: A beveled edge portion (135) is formed on one side where the straightening block (131) and the straightening adjustment box (132) are in contact with each other, so as to be used for installing the straightening block (131) when the polished rod (4) is deflected.

3. The packing box for centering the heel according to claim 1, characterized in that: The straightening pressure cap (133) has a stepped structure; The straightening pressure cap (133) is partially mounted on the straightening block (131) and the top end of the straightening adjustment box (132), and another portion of the straightening pressure cap (133) extends to the outside of the straightening adjustment box (132).

4. The packing box for centering the heel according to claim 1, characterized in that: The upper and lower side ends of the packing box pressing cap (7) are respectively screwed and fixed on the outer sides of the straightening adjustment box (132) and the packing box housing (5); A groove is formed between the packing box pressure cap (7) and the straightening pressure cap (133); The second locking ring part (134) is located in the groove.

5. The packing box for centering the heel according to claim 1, characterized in that: The interior of the rubber sleeve (14) is filled; A rubber sleeve joint (15) is bonded to the outer side of the upper end of the rubber sleeve (14); The top ends of the rubber sleeve (14) and the rubber sleeve joint (15) abut against the packing box pressure cap (7); The outer side of the rubber sleeve joint (15) is attached to the inner wall of the packing box housing (5); An inner cavity is formed on the inner side of the packing box housing (5); A rubber sleeve sealing ring (16) is installed in the inner cavity; The rubber sleeve sealing ring (16) is installed between the rubber sleeve joint (15) and the packing box housing (5).

6. The packing box for centering the heel according to claim 1, characterized in that: The upper end of the rubber sleeve (14) extends upward to the outside of the gland (11); The bottom of the rubber sleeve (14) is located between the base (10) and the packing box housing (5).

7. The packing box for centering the heel according to claim 1, characterized in that: The straightening block (131) is made of engineering plastics.

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