CN216922068U - Manual-automatic integrated oil well wellhead packing box - Google Patents

Abstract

The utility model discloses a manual-self-integrated oil wellhead packing box, which comprises a joint, a heel-biasing cap and a heel-biasing plate. The heel-biasing plate is partially located between the heel-biasing cap and the joint, and the heel-biasing plate can move along a horizontal direction. It moves with the polished rod; the packing box also includes a polished rod and a packing box shell extending along the axial direction of the packing box; a stuffing box joint is embedded in the upper part of the packing box shell, and there is elastic packing between the stuffing box joint and the polished rod The outer circumference of the part of the polished rod placed in the casing of the packing box has a spiral packing; the lower part of the casing of the packing box has an inclined surface, and the lower part of the stuffing box joint is pressed with a pressing block, and the pressing block can slide along the inclined plane to Compress the elastic stuffing box. The packing box of the utility model adopts the elastic stuffing box instead of the rigid stuffing box, and the back pressure of the wellhead is used to drive the pressing block to act on the outer surface of the elastic stuffing box, so as to act on the packing, so as to ensure the lasting sealing effect, and it can be used without artificial In case of adjustment, a long-term seal is guaranteed.

Description

Manually integrated oil well head packing box

technical field

The utility model relates to the technical field of oil extraction operations in oil fields, in particular to a manual-autonomous oil well wellhead packing box.

Background technique

At present, a rigid stuffing box is used for the wellhead sealing of oil wells. Rubber or rubber rings are added to the stuffing box. The upper part of the stuffing box is provided with a gland and a packing cap. The packing cap is connected with the outer wall of the stuffing box by threads. The cap goes down, which drives the Gland to press down to deform the packing in the stuffing box, resulting in a sealing effect.

And the packing box structure in the prior art generally has the following defects, which are:

1. Manually adjusting the deformation of the packing cannot make the deformation reach the optimal state all the time. The initial deformation is too large, and the wear is high. After wear, the sealing performance is reduced. If it is not adjusted in time, it is easy to cause leakage and cause pollution.

2. Most of the packing boxes in the prior art do not have the offset adjustment function, and those with the offset adjustment function only use the offset adjustment method of eccentric (horizontal) or ball head (vertical), which are mostly manual adjustment and have a single function. Once adjusted, the direction and distance cannot be changed. However, in actual operation, the deflection of the wellhead is complex and varied, and a single deflection adjustment cannot meet the needs. Therefore, many oil wells have very serious wellhead leakage, resulting in a lot of waste of resources and environmental pollution;

3. In the prior art, in order to reduce losses and increase efficiency, the oilfield greatly reduces the number of workers, so a new type of packing box structure that does not require or greatly reduces labor is urgently needed.

Utility model content

The purpose of the utility model is to provide a common sealing method that replaces the rigid stuffing box with an elastic stuffing box, utilizes the back pressure of the wellhead and surrounds the outer elastic stuffing box with a pressing block to realize the pressure. The manual-integrated oil wellhead packing box has a good tracking function and can save a lot of labor costs.

In order to achieve the above object, the utility model provides the following technical solutions:

The utility model relates to a manual-integrated oil well head packing box, which comprises:

a joint at the bottom through which the packing box is connected to an external Christmas tree joint;

a heel biasing cap mounted on the upper part of the joint;

a tracking disc, the part of the tracking disc is located between the tracking cap and the joint, and the tracking disc can move freely along the horizontal direction;

The packing box also includes:

a polished rod extending axially along the packing box;

a packing box housing located at the upper part and connected to the upper part of the tracking deflection disc;

The upper part of the packing box shell is embedded with a stuffing box joint, and the stuffing box joint is built into a whole on the upper part of the elastic stuffing box;

The outer periphery of the part of the polished rod placed in the elastic stuffing box has a spiral packing;

The lower part of the packing box shell has an inclined surface, and the lower part of the stuffing box joint is pressed with a pressing block, and the pressing block can slide along the inclined surface to press the elastic stuffing box.

Further, the upper part of the joint is formed as a joint platform with a cross-sectional dimension larger than that of the joint;

The inner ring of the joint platform is provided with a sealing ring base, the sealing ring base is embedded with a tracking offset sealing ring, and the cross section of the tracking offset sealing ring is configured as a concave shape;

The tracking disc includes:

follow the disc body; and

an upper joint on the tracking disk extending toward the packing box housing along the axis direction of the tracking disk body;

The follower disc is sleeved on the outside of the polished rod;

The upper surface of the tracking disc body is pressed and held by the tracking biasing cap, and the tracking disc can move along the horizontal direction with the polished rod;

The heel-biasing cap is threadedly connected to the outer peripheral surface of the joint platform.

Further, the lower part of the packing box shell is threadedly connected with the upper part of the upper joint of the tracking disc, and the lower end of the packing box shell has a dead ring;

A self-sealing ring is installed between the upper end of the joint on the follower disc and the casing of the packing box.

Further, the lower end of the spiral packing has a bottom bracket sleeved on the outer circumference of the polished rod;

The upper end of the spiral packing has a grommet sleeved on the outer periphery of the polished rod;

The elastic stuffing box is located on the outer peripheral surface of the helical packing, the bottom bracket and the grommet;

The inner diameter of the elastic stuffing box is smaller than the outer diameter of the spiral packing.

Further, two seal ring cavities are spaced apart along the length direction of the outer circumference of the stuffing box joint, and an O-ring is embedded in the seal ring cavities;

The pressing block is configured as a pipe structure with inclined planes on both the upper and lower ends, and the pressing block is longitudinally cut into multiple pieces, and a pipe wall with a certain width between the pressing blocks is cut off to ensure the pressing force. There is necessary space when the tight block is squeezed inward;

The lower end of the stuffing box joint has a surface matched with the inclined surface of the upper end of the pressing block, between the stuffing box joint and the pressing block, and between the pressing block and the packing box shell The pressing block is driven to press the outer periphery of the elastic stuffing box by the inclined surface.

Further, the bottom of the elastic stuffing box is installed with a steel rubber sleeve and a steel bottom ring.

Further, the upper end of the packing box shell is threadedly connected with a packing pressure cap;

An adjusting nut is installed on the upper part of the polished rod, and the lower part of the adjusting nut extends to the inside of the packing pressing cap and abuts the upper end surface of the flange.

Further, the adjusting nut is threadedly connected with the inner ring of the packing and pressing cap.

In the above-mentioned technical scheme, the utility model provides a manual-integrated oil wellhead packing box, which has the following beneficial effects:

The packing box of the utility model adopts an elastic stuffing box instead of a rigid stuffing box, and uses the back pressure of the wellhead and the elastic shrinkage force of the stuffing box itself to drive the spiral packing to automatically adjust in the process of gradual wear and tear. long-term sealing;

When the packing box of the utility model is out of round, the back pressure is too low, the viscosity of the crude oil is too large, the production temperature is too high and the hot washing is frequent, the automatic adjustment force will be insufficient. Pressing, the lower slope of the elastic stuffing box joint presses the compression block, and the compression block squeezes the elastic stuffing box to the inside under the action of the slope pressure, which increases the internal pressure of the packing and improves the sealing effect of the packing.

In the packing box of the utility model, when the polished rod and the wellhead are misaligned, the polished rod drives the tracking disc to move flexibly laterally in the cavity formed between the biasing cap and the joint, and the elastic stuffing box is a flexible structure, which can adjust a certain amount of longitudinal skewed. When replacing the packing, turn the dead ring downward, rotate the packing box shell and press the self-sealing ring downward, and the self-sealing ring deforms and seals the smooth rod, so that the packing can be replaced without releasing the pressure, reducing the working time of replacing the packing and avoiding the waste of resources and Environmental pollution.

The device of the utility model is composed of a joint, a follower bias cap, a follower disc, and a follower seal, and the follower disc is located between the follower cap and the joint, and can move with the polished rod along the horizontal direction to realize the real-time anti-bias function; There is a self-sealing ring between the joint on the follower plate and the packing box shell. When replacing the packing, the spinning self-sealing ring is deformed and seals the annular space between the packing box and the polished rod, so that the packing can be replaced without pressure relief. , while reducing the waste of resources and saving labor time; the upper part of the packing box shell is embedded with a stuffing box joint, and there is an elastic stuffing box between the stuffing box joint and the polished rod; the spiral packing is installed in the elastic stuffing box, Hold the polished rod tightly to achieve the purpose of sealing the polished rod and the oil pipe annulus; the lower part of the packing box shell has a slope, which forms a manual pressing device with the lower slope of the stuffing box joint and multiple pressing blocks that also have upper and lower slopes. The tightening block can be screwed down by the packing cap to drive the stuffing box joint downward, and the pressing block moves to the center, squeezes the outer wall of the stuffing box, and adds a pressure to the packing, so that the sealing ability is improved; the packing of the utility model The box adopts an elastic stuffing box instead of a rigid stuffing box. The back pressure of the wellhead and the elastic shrinkage force of the stuffing box are used to drive the spiral packing to automatically adjust in the process of gradual wear, so as to ensure long-term sealing without manual adjustment. For wells with out-of-roundness, too low back pressure, too high crude oil viscosity, too high production temperature and frequent hot washing, the automatic adjustment force will be insufficient. requirements; it can also be temporarily tightened by tube well personnel after the automatic adjustment limit of the packing, without personnel replacing the packing in time, which can also play a temporary sealing effect.

Description of drawings

In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the accompanying drawings that need to be used in the embodiments will be briefly introduced below. Obviously, the drawings in the following description are only in the present invention For some of the described embodiments, for those of ordinary skill in the art, other drawings can also be obtained according to these drawings.

FIG. 1 is a schematic structural diagram of a manual-integrated oil wellhead packing box provided by an embodiment of the present invention.

Description of reference numbers:

1. Joint; 2. Follow offset sealing ring; 3. Follow offset pressure cap; 4. Follow offset plate; 5. Dead ring; 6. Packing box shell; 7. Elastic stuffing box; 8. Press block; 9. Packing cap; 10. Adjusting nut; 11. Polished rod; 13. Stuffing box joint; 14. Self-sealing ring;

101. Joint platform; 102. Seal ring base;

401. The body of the follower disc; 402, the upper joint of the follower disc;

701. Rigid bottom ring of rubber sleeve;

1201, spiral packing; 1202, Glan; 1203, bottom bracket;

1301. Seal the ring cavity.

Detailed ways

In order to make those skilled in the art better understand the technical solutions of the present invention, the present invention will be further described in detail below with reference to the accompanying drawings.

See Figure 1;

A manual-integrated oil wellhead packing box of the present embodiment, the packing box includes:

The joint 1 at the bottom, the packing box is connected to the external Christmas tree joint through the joint 1;

The heel bias cap 3 installed on the upper part of the joint 1;

The tracking disc 4, the part of the tracking disc 4 is located between the tracking cap 3 and the joint 1, and the tracking disc 4 can move arbitrarily along the horizontal direction;

The packing box also includes:

A polished rod 11 extending axially along the packing box;

The packing box housing 6 located on the upper part and connected with the deflection disc 4;

A stuffing box joint 13 is embedded in the upper part of the packing box shell 6, and there is an elastic stuffing box 7 between the stuffing box joint 13 and the polished rod 11;

The outer circumference of the part of the polished rod 11 placed in the elastic stuffing box 7 has a spiral packing 401;

The lower part of the packing box shell 6 has an inclined surface, and the lower part of the stuffing box joint 13 holds a pressing block 8 , which can slide along the inclined surface to press the elastic stuffing box 7 .

Wherein, the upper part of the above-mentioned joint 1 is formed as a joint platform 101 with a cross-sectional dimension larger than that of the joint 1;

The inner ring of the joint platform 101 is provided with a sealing ring base 102, the sealing ring base 102 is embedded with a tracking seal ring 2, and the cross section of the tracking sealing ring 2 is configured as a concave shape;

Track 4 includes:

tracking disc body 401; and

an upper joint 402 of the tracking disk extending toward the packing box housing 6 along the axis direction of the tracking disk body 401;

The tracking disc 4 is sleeved on the outside of the polished rod 11;

The upper surface of the tracking disc body 401 is pressed and held by the tracking biasing cap 3, and the tracking disc 4 can move along the horizontal direction with the polished rod 11;

The biasing cap 3 is screwed to the outer peripheral surface of the joint platform 101 .

Specifically, the present embodiment discloses a new type of packing box structure, which mainly includes a polished rod 11, a packing box shell 6, a joint 1 located at the bottom and connected to a Christmas tree joint, and the upper part of the joint 1 has a joint platform 101, The inner ring of the joint platform 101 is provided with a concave tracking and deflection sealing ring 2, and the threaded connection between the tracking and biasing cap 3 and the joint platform 101 is used to realize the pressing and holding of the tracking disk 4. The tracking disk 4 in this embodiment can follow the polished rod 11. Under the dynamic deflection of the wellhead, the follow-up adjustment in the horizontal direction is realized.

Preferably, the lower part of the packing box housing 6 of the present embodiment is threadedly connected with the upper part of the upper joint 402 of the tracking disc, and the lower end of the packing box housing 6 has a dead ring 5;

A self-sealing ring 14 is installed between the upper end of the joint 402 on the yaw plate and the casing 6 of the packing box.

The lower end of the spiral packing 1201 has a bottom bracket 1203 sleeved on the outer circumference of the polished rod 11;

The upper end of the spiral packing 1201 has a glan 1202 sleeved on the outer periphery of the polished rod 11;

The elastic stuffing box 7 is located on the outer peripheral surface of the spiral packing 1201, the bottom bracket 1203 and the Glan 1202;

The inner diameter of the elastic stuffing box 7 is smaller than the outer diameter of the spiral packing 1201 .

The outer circumference of the stuffing box joint 13 is spaced apart along its length direction with two sealing ring cavities 1301, and an O-ring is embedded in the sealing ring cavities 1301;

The pressing block 8 is configured as a pipe structure with inclined planes on both the upper and lower ends, the longitudinal line is cut into multiple pieces, and the tube wall with a certain width between the pressing blocks 8 is cut off to ensure that the pressing blocks are pressed inward necessary space;

The lower end of the stuffing box joint 13 has a surface that cooperates with the inclined surface of the upper end of the pressing block 8, and between the stuffing box joint 13 and the pressing block 8, and between the pressing block 8 and the packing box shell 6 are driven by the inclined surface The pressing block presses the outer circumference of the elastic stuffing box 7 .

Wherein, the bottom of the above-mentioned elastic stuffing box 7 is installed with a rubber-sleeved steel bottom ring 701 .

Wherein, the upper end of the above-mentioned packing box housing 6 is threadedly connected with a packing pressure cap 3;

An adjusting nut 10 is installed on the upper part of the packing cap 3 , and the lower part of the adjusting nut 10 extends to the inside of the packing cap 3 and abuts the upper end surface of the flange 1202 .

The adjusting nut 10 is threadedly connected to the inner ring of the packing cap 3 .

During operation, the inner diameter of the elastic stuffing box 7 is smaller than the outer diameter of the screw packing 1201. When the screw packing 1201 is added into the elastic stuffing box 7, the elastic stuffing box 7 is subjected to a force to ensure that the two form an interference fit. The packing is subjected to the elastic inner hoop force of the elastic stuffing box 7. During normal production, there is a certain back pressure at the wellhead, and the back pressure also acts on the outer surface of the elastic stuffing box 7, thus acting on the packing to ensure a lasting sealing force. It can guarantee long-term sealing without manual adjustment.

In the above-mentioned technical scheme, the utility model provides a manual-integrated oil wellhead packing box, which has the following beneficial effects:

The packing box of the present invention adopts the elastic stuffing box 7 instead of the rigid stuffing box, and uses the back pressure of the wellhead and the elastic shrinkage force of the elastic stuffing box 7 itself to drive the spiral packing to adjust automatically in the process of gradual wear and tear. The case guarantees a long-term seal.

When the packing box of the present invention is out of round, the back pressure is too low, the viscosity of crude oil is too large, the production temperature is too high, and the wells are frequently hot-washed, the automatic adjustment force will be insufficient, and the rotating packing pressure cap 3 And press down, the lower slope of the elastic stuffing box joint presses the compression block 8, and the compression block 8 squeezes the elastic stuffing box 7 to the inside under the action of the slope pressure to increase the internal pressure of the packing and improve the sealing effect of the packing.

In the packing box of the present invention, when the polished rod 11 is not aligned with the wellhead, the polished rod 11 drives the tracking disc 4 to move flexibly laterally in the cavity formed between the biasing cap 10 and the joint 1, and the elastic stuffing box 7 is a flexible structure. A certain amount of longitudinal skew can be adjusted. When replacing the packing, turn the dead ring 5 downward, and the rotating packing box shell presses the self-sealing ring 14 downward, and the self-sealing ring 14 deforms to seal the polished rod 11, so that the packing can be replaced without releasing the pressure, and the working time of replacing the packing can be reduced. Avoid resource waste and environmental pollution.

Certain exemplary embodiments of the present invention have been described above by way of illustration only, and it goes without saying that for those of ordinary skill in the art, without departing from the spirit and scope of the present invention, various different Modifications are made to the described embodiments. Accordingly, 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 (8)

1. Manual-integrated oil well head packing box, is characterized in that, this packing box comprises: A joint (1) at the bottom, through which the packing box is connected to an external Christmas tree joint; a heel biasing cap (3) mounted on the upper part of the joint (1); A tracking disc (4), the tracking disc (4) is partially located between the tracking cap (3) and the joint (1), and the tracking disc (4) can be arbitrarily arranged along the horizontal direction move; The packing box also includes: a polished rod (11) extending axially along the packing box; a packing box housing (6) located at the upper part and connected to the tracking disc (4); A stuffing box joint (13) is embedded in the upper part of the packing box shell (6), and an elastic stuffing box (7) is arranged between the stuffing box joint (13) and the polished rod (11); The outer periphery of the part of the polished rod (11) placed in the elastic stuffing box (7) has a spiral packing (1201); The lower part of the packing box shell (6) has an inclined surface, and the lower part of the stuffing box joint (13) holds a pressing block (8), and the pressing block (8) can slide along the inclined surface to compress the elastic stuffing box (7). 2. The manual-integrated oil wellhead packing box according to claim 1, wherein the upper part of the joint (1) is formed as a joint platform (101) with a cross-sectional dimension larger than the cross-sectional dimension of the joint (1); The inner ring of the joint platform (101) is provided with a sealing ring base (102), the sealing ring base (102) is embedded with a tracking offset sealing ring (2), and the cross section of the tracking offset sealing ring (2) is Configured as concave; The tracking disc (4) includes: a tracking disc body (401); and an upper joint (402) on the tracking disk extending toward the packing box housing (6) along the axial direction of the tracking disk body (401); The tracking disc (4) is sleeved on the outside of the polished rod (11); The upper surface of the tracking disc body (401) is pressed and held by the tracking biasing cap (3), and the tracking disc (4) can move freely along the horizontal direction along with the polished rod (11); The heel biasing cap (3) is threadedly connected to the outer peripheral surface of the joint platform (101). 3. The manual-integrated oil wellhead packing box according to claim 2, characterized in that, the lower part of the packing box casing (6) is threadedly connected with the upper part of the joint (402) on the follower plate, And the lower end of the packing box shell (6) is provided with a locking ring (5); A self-sealing ring (14) is installed between the upper end of the upper joint (402) of the tracking disc and the packing box housing (6). 4. The manual-integrated oil wellhead packing box according to claim 3, wherein the lower end of the spiral packing (1201) has a bottom bracket (1203) sleeved on the outer periphery of the polished rod (11); The upper end of the spiral packing (1201) is provided with a grommet (1202) sleeved on the outer periphery of the polished rod (11); The elastic stuffing box (7) is located on the outer peripheral surface of the spiral packing (1201), the bottom bracket (1203) and the glan (1202); The inner diameter of the elastic stuffing box (7) is smaller than the outer diameter of the spiral packing (1201). 5. The manual-integrated oil wellhead packing box according to claim 4, characterized in that, two sealing ring cavities (1301) are spaced apart from the outer periphery of the stuffing box joint (13) along its length direction, and the An O-ring is embedded in the sealing ring cavity (1301); The pressing block (8) is configured as a pipe with inclined planes at the upper and lower ends, the longitudinal line is cut into multiple pieces, and the pipe wall with a certain width between the pressing blocks (8) is cut off; The lower end of the stuffing box joint (13) has a surface matching with the inclined surface of the upper end of the pressing block (8). Both the pressing block (8) and the packing box shell (6) are driven by the inclined surface to press the pressing block (8) to hold the outer periphery of the elastic stuffing box (7). 6 . The manual-integrated oil wellhead packing box according to claim 5 , wherein a rubber-sleeved steel bottom ring ( 701 ) is installed at the bottom of the elastic stuffing box ( 7 ). 7 . 7. The manual-integrated oil wellhead packing box according to claim 5, wherein the upper end of the packing box casing (6) is threadedly connected with a packing cap (9); An adjusting nut (10) is installed on the upper part of the polished rod (11), and the lower part of the adjusting nut (10) extends to the inside of the packing pressing cap (9) and abuts the flange (1202) ) on the upper end face. 8 . The manual-integrated oil wellhead packing box according to claim 7 , wherein the adjusting nut ( 10 ) is threadedly connected to the inner ring of the packing pressure cap ( 9 ). 9 .

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