CN217976147U - Polished rod sealing assembly - Google Patents

Abstract

The utility model relates to a polish rod sealing assembly, which comprises a dynamic self-aligning polish rod clip and a polish rod sealer, wherein the dynamic self-aligning polish rod clip comprises a C-shaped seat, a support ring, a ball group, a spherical guide plate and a polish rod spherical clip, and the C-shaped seat is fixed on the upper surface of a polished rod eye of a pumping unit; the ball group is arranged on the support ring, the spherical guide plate is arranged on the ball group, and a gap is reserved between the spherical guide plate and the C-shaped seat, so that the spherical guide plate can horizontally move; the spherical guide plate is in spherical fit with the spherical clamp of the polish rod; the inner hole of the spherical clamp of the polish rod is in interference fit with the polish rod. Because the spherical structure of the polished rod spherical clip is matched with the spherical structure of the spherical guide plate, the polished rod spherical clip centers the center, and the spherical guide plate resets in a follow-up manner, so that the polished rod is always coaxial with the elastic polished rod sealer in the process of up-and-down reciprocating motion. The accidents of polished rod breakage, downhole fluid leakage and the like caused by misalignment of the polished rod and the polished rod sealer are reduced.

Description

Polished rod sealing assembly

Technical Field

The utility model belongs to the technical field of oil development beam-pumping unit, a polished rod seal assembly is related to.

Background

The polished rod is one of the main parts of the oil pumping unit and is vertically installed and used. The upper end of the polish rod is seated on the polished rod eye of the oil pumping unit through a polish rod clip, and the lower end of the polish rod is inserted into the oil well and connected with the oil pumping rod. In the working process of the oil pumping unit, the motor reducer drives the rope hanger and the polished rod to reciprocate up and down through the transmission mechanism, so that a piston of the sucker rod in the oil well is pulled to reciprocate up and down, and oil, natural gas, coal bed gas and the like are pumped out of the ground.

In order to prevent the produced liquid from being sprayed out from the well mouth, a polish rod sealer is arranged at the well mouth and is rigidly connected with the well mouth, and a sealing packing arranged in the polish rod sealer plays a role in sealing the polish rod.

The friction grains are arranged in the polish rod clamp, so that the fastening degree between the polish rod clamp and the polish rod is improved, the friction grains are tightly embedded into the polish rod to cause mechanical damage and fatigue cracks on the surface of the polish rod, the polish rod is often broken into an upper section and a lower section, and the production of a pumping well is stopped; secondly, the broken lower part of the polish rod falls into an oil well, and the sealing failure of a wellhead causes the leakage of underground liquid, thereby causing environmental pollution; thirdly, the "upper part of the polish rod" that causes the fracture falls from the air, which can injure the personnel and equipment below.

The polished rod and the polished rod sealer are difficult to center under the influence of factors such as installation precision error of an oil well head, well deviation in a well, uneven settlement (changed along with seasons) of a pumping unit foundation on the well and the like, firstly, the loss speed of the packing of the polished rod sealer is accelerated, the sealing performance of the packing is deteriorated, the service life of the packing is shortened, and leakage accidents at the polished rod are caused; secondly, the additional load at the polish rod clip is increased, so that the fatigue life of the polish rod is reduced, and the polish rod is burst to break at the additional load.

The measures adopted at present are as follows: the polished rod sealer has the functions of static horizontal deviation adjustment and spherical surface centering; filling sealant into the sealer irregularly to compensate the abrasion of the sealing surface; adding lubricating grease to the sealing surface to slow down the abrasion of the sealing surface; and so on. However, these measures are static offset methods, and the effect is not ideal in the practical application process, and needs to be further improved.

Disclosure of Invention

For overcoming the not enough of prior art, the utility model aims at providing a polished rod seal assembly has the dynamic aligning function, can prolong sealed life, can implement the main sealed operation of changing on line, can also effectively solve because of polished rod and polished rod sealing device not the polished rod fracture that the centering leads to, the problem of liquid leakage in the pit.

In order to achieve the above object, the utility model discloses a following technical scheme realizes:

a polish rod sealing assembly comprises a dynamic aligning polish rod clip and a polish rod sealer, wherein the dynamic aligning polish rod clip is arranged on a polished rod eye of a pumping unit and is rigidly connected with a well head; the support ring is placed on the inner end face of the C-shaped seat, the ball group is installed on the support ring, the spherical guide plate is placed on the ball group, and a gap is reserved between the spherical guide plate and the C-shaped seat, so that the spherical guide plate can horizontally rotate; the spherical guide plate is in spherical fit with the spherical clamp of the polish rod; the inner hole of the polished rod spherical clamp is in interference fit with the polished rod;

the elastic polish rod sealer comprises a joint, a shell, a multi-stage annular sealing packing and a single-stage annular sealing packing; the lower end of the joint is fixedly connected with a wellhead, and the upper end of the joint is in threaded connection with the lower end of the shell; the upper end and the lower end of the shell are both provided with cavities, and the multistage annular sealing packing is arranged in the upper cavity of the shell; the multistage annular sealing disk root consists of a sealing disk root end cover, a sealing packing outer ring and a sealing packing inner ring, wherein the inner walls of the sealing disk root end cover and the sealing packing inner ring are sleeved with a polished rod, the sealing packing outer ring is sleeved outside the sealing disk root end cover and the sealing packing inner ring, the contact surfaces of the sealing packing outer ring, the sealing disk root end cover and the sealing packing inner ring are conical surfaces, the sealing disk root end covers are arranged at two ends of the sealing packing inner ring, and more than one sealing packing inner ring is arranged; the single-stage annular sealing packing is arranged in a closed cavity formed by the lower end cavity of the shell and the upper part of the joint, the shell is rotated, and the single-stage annular sealing packing is compressed to hold the polished rod tightly when the closed cavity is reduced.

The descaling device also comprises a sealing cylinder, a gland, a first distance ring and a descaling ring, wherein the sealing cylinder is placed in the upper end cavity of the shell and is fixedly connected with the shell through a bolt; the gland is arranged at the top of the sealing cylinder and is fixedly connected with the sealing cylinder through a screw; the descaling ring is arranged between the polished rod and the gland and is provided with a lip-shaped sealing body structure, and the inner diameter of the lip-shaped sealing body of the descaling ring is tightly matched with the polished rod; the first distance ring is placed below the descaling ring, the lower end of the first distance ring is flush with the lower end of the gland, the inner diameter of the first distance ring is in clearance fit with the polished rod, and the outer diameter of the first distance ring is in clearance fit with the gland; the multistage annular sealing packing is arranged in a space enclosed by the sealing cylinder and the gland.

The single-stage annular sealing disc root comprises a sealing disc root end cover and a sealing disc root outer ring, wherein the sealing disc root end cover is provided with the sealing disc root outer ring, and the contact surface between the sealing disc root end cover and the sealing disc root end cover is a conical surface.

The polished rod is characterized by further comprising a second distance ring, the lower portion of the joint is an open cavity, the second distance ring is arranged in the open cavity, the inner diameter of the second distance ring is in clearance fit with the polished rod, and the outer diameter of the second distance ring is in clearance fit with the joint.

The dynamic aligning polish rod clip further comprises a guide plate limiting seat, the guide plate limiting seat is fixed on the upper surface of the beam hanger of the pumping unit, and the guide plate limiting seat is arranged on the outer side of the spherical guide plate and limits the axial position and the radial position of the guide plate limiting seat.

The upper part of the spherical guide plate is of an inwards concave spherical structure, and the bottom of the polished rod spherical clamp is of an outwards convex spherical structure.

The upper surface of the support ring is provided with a ball concave ring.

The polished rod anti-drop device is characterized by further comprising a polished rod anti-drop clamp and a chain, wherein the polished rod anti-drop clamp is arranged below the polished rod eye of the pumping unit, an inner hole of the polished rod anti-drop clamp is in interference fit with the polished rod, one end of the chain is fixed on the polished rod anti-drop clamp, and the other end of the chain is fixedly connected with a polished rod spherical clamp.

Compared with the prior art, the beneficial effects of the utility model are that:

the polished rod sealing assembly has a dynamic aligning function, the service life of the sealer is prolonged by adopting multi-stage and single-stage annular sealing packing, the cost performance is high, the main sealing operation is replaced on line, and the accidents of polished rod fracture, underground liquid leakage and the like caused by misalignment of the polished rod and the polished rod sealer can be effectively reduced. Specifically, the method comprises the following steps:

1) When the polished rod and the polished rod sealer are not centered, the polished rod spherical clamp enables the spherical guide plate to horizontally move under the driving of the polished rod, and meanwhile, the outer spherical surface of the polished rod spherical clamp can automatically center, so that the polished rod can be always coaxial with the elastic polished rod sealer.

In addition, the polished rod sealer is internally provided with a multi-stage and single-stage annular sealing packing which can reduce the motion amplitude of the polished rod and is beneficial to the reset of the polished rod.

2) The spherical clamp of the polish rod is in interference fit with the polish rod, so that the mechanical damage and fatigue crack on the surface of the polish rod can not be caused.

3) When the polish rod is broken carelessly, the chain can hang the upper part and the lower part of the polish rod formed after the polish rod is broken on the polished rod eye of the oil pumping unit, so that the leakage accident caused by the fact that the lower part of the polish rod formed after the polish rod is broken falls into an oil well is avoided; the 'upper part of the polish rod' formed after the polish rod is broken can be prevented from falling down from the air, so that the accidents that personnel below are injured and equipment and facilities are damaged can be avoided.

4) Multistage annular seal packing in the elasticity polished rod sealing ware is main seal effect, and single-stage annular seal packing in the elasticity polished rod sealing ware is supplementary seal effect, and single-stage annular seal packing is non-input state under the normal operating condition, and when needing to be changed multistage annular seal packing, accessible rotatory casing makes single-stage annular seal packing receive the compression and get into operating condition, realizes changing main seal operation on line.

Drawings

Fig. 1 is a front view of a polish rod seal assembly.

Fig. 2 is a top view of the polish rod seal assembly.

Fig. 3 is a side view of the polish rod seal assembly.

Fig. 4 isbase:Sub>A cross-sectional view taken along linebase:Sub>A-base:Sub>A of fig. 1.

Fig. 5 is a cross-sectional view taken along line B-B of fig. 1.

Fig. 6 is an enlarged view of a portion a of fig. 5.

Fig. 7 is a schematic structural view of the C-shaped seat.

Fig. 8 is a schematic structural view of the support ring.

Fig. 9 is a schematic structural view of the spherical guide.

FIG. 10 is a schematic view of the structure of the guide plate retainer.

Fig. 11 is a schematic structural view of a sphere clip of a polish rod.

Fig. 12 is a structural schematic view of the anti-drop clip of the polish rod.

In the figure: 100-dynamic self-aligning polish rod clip, 200-polish rod sealer, 1-pumping unit polished rod eye, 2-polish rod, 3-C type seat, 4-support ring, 5-ball group, 6-spherical guide plate, 7-guide plate limit seat, 8-polish rod spherical clip, 9-polish rod anti-drop clip, 10-chain, 11-joint, 12-shell, 13-sealing cylinder, 14-gland, 15-descaling ring, 16-spacing ring I, 300-multistage annular sealing packing, 400-single stage annular sealing packing, 17-sealing disk root end cover, 18-sealing packing outer ring, 19-packing inner ring and 20-spacing ring II.

Detailed Description

The present invention will be described in detail below with reference to the accompanying drawings, but it should be noted that the present invention is not limited to the following embodiments.

Referring to fig. 1-4, fig. 6-12, a polish rod sealing assembly includes a dynamic centering polish rod clip 100 and a polish rod sealer 200, the dynamic centering polish rod clip 100 is arranged on a polished rod eye 1 of an oil pumping unit, and the polish rod sealer 200 is fixedly connected with a wellhead.

The dynamic self-aligning polish rod clip 100 comprises a C-shaped seat 3, a support ring 4, a ball group 5, a spherical guide plate 6 and a polish rod spherical clip 8, wherein the C-shaped seat 3 is welded on the upper surface of the beam hanger 1 of the pumping unit and is coaxial with a central hole of the beam hanger 1 of the pumping unit; the support ring 4 is placed on the inner end face of the C-shaped seat 3, a ball concave ring is arranged on the upper surface of the support ring 4 and used for limiting the position of a ball group 5, the ball group 5 is installed on the ball concave ring, the spherical guide plate 6 is placed on the ball group 5, and a gap is reserved between the spherical guide plate 6 and the C-shaped seat 3, so that the spherical guide plate 6 can horizontally move and does not interfere with the C-shaped seat; the spherical guide plate 6 is of an inwards concave spherical structure, the bottom of the polished rod spherical clamp 8 is of an outwards convex spherical structure, and the spherical guide plate 6 and the polished rod spherical clamp 8 are coaxially arranged and are matched through the spherical structure; the inner hole of the polish rod spherical clip 8 is in interference fit with the polish rod 2.

In addition, the guide plate limiting seat 7 is fixed on the upper surface of the beam hanger 1 of the pumping unit, the guide plate limiting seat 7 is arranged outside the spherical guide plate 6, and the guide plate limiting seat 7 limits the axial position and the radial position of the spherical guide plate 6.

The polish rod spherical clamp 8 is of a split structure and is longitudinally split into two parts, and the two parts are fastened through a bolt 82 and a nut 83 to form the integral polish rod spherical clamp 8, so that the polish rod spherical clamp 8 and the polish rod 2 are in interference fit while the installation is convenient.

On polished rod 2, polished rod anti-drop checkpost 9's hole and polished rod 2 interference fit, polished rod anti-drop checkpost 9 sets up in beam-pumping unit polished rod eye 1 below, and chain 10 upper end is fixed on polished rod anti-drop checkpost 9, lower extreme and polished rod sphere checkpost 8 fixed connection. The polished rod anti-drop checkpost 9 also can adopt the components of a whole that can function independently structure, vertically cuts open and is divided into two parts, and the two forms whole polished rod anti-drop checkpost 9 through bolt 91, nut 92 fastening, when easy to assemble, ensures polished rod anti-drop checkpost 9 and polished rod 2 interference fit. A circular ring structure consisting of two chains 10 can be adopted to be sleeved on the beam hanger 1 of the pumping unit to ensure that the broken polished rod 2 cannot fall off, as shown in figure 3.

Referring to fig. 4-6, the elastic polish rod sealer 200 includes a joint 11, a housing 12, a multi-stage annular seal packing 300, a single-stage annular seal packing 400; the lower end of the joint 11 is fixedly connected with a wellhead, and the upper end of the joint 11 is in threaded connection with the lower end of the shell 12; the upper and lower both ends of casing 12 all are equipped with open cavity, and multistage annular seal packing 300 sets up in the upper end cavity of casing 12.

Specifically, a sealing cylinder 13 is placed in an upper end cavity of the shell 12, and the sealing cylinder 13 is fixedly connected with the shell 12 through a bolt; the gland 14 is placed at the top of the sealing cylinder 13 and is fixedly connected with the sealing cylinder 13 through screws; the descaling ring 15 is arranged between the polished rod 2 and the gland 14, the descaling ring 15 is provided with a lip-shaped sealing body structure, and the inner diameter of the lip-shaped sealing body of the descaling ring 15 is tightly matched with the polished rod 2; the first distance ring 16 is placed below the descaling ring 15, the lower end of the first distance ring 16 is flush with the lower end of the gland 14, the inner diameter of the first distance ring 16 is in clearance fit with the polished rod 2, and the outer diameter of the first distance ring 16 is in clearance fit with the gland 14; the first distance ring 16 plays a role in supporting the descaling ring 15, meanwhile, the descaling ring 15 needs to be installed from the lower part, and the first distance ring 16 can fill the space left after the descaling ring 15 is installed. The multi-stage annular packing 300 is disposed in a space enclosed by the seal cylinder 13 and the gland 14. The axial compression amount of the multistage annular seal packing 300 is increased, and the radial compression amount of the multistage annular seal packing 300 to the polish rod 2 is also increased synchronously, so that the holding force between the multistage annular seal packing 300 and the polish rod 2 is increased, and the sealing property is improved.

Multistage annular seal packing 300 is by sealed disk root end cover 17, sealed packing outer loop 18 and sealed packing inner ring 19 are constituteed, sealed disk root end cover 17, sealed packing inner ring 19's inner wall cup joints with polished rod 2, sealed disk root end cover 17, sealed packing outer loop 18 has been cup jointed to sealed packing inner ring 19's outside, sealed packing outer loop 18 and sealed disk root end cover 17, sealed packing inner ring 19's contact surface is the conical surface, 19 surfaces of sealed packing inner ring are the biconical surface, sealed disk root end cover 17 sets up at 19 both ends of sealed packing inner ring, sealed packing inner ring 19 is more than one.

Single-stage annular seal packing 400 sets up in the closed cavity that the lower extreme cavity of casing 12 and joint 11 upper portion enclose, and single-stage annular seal packing 400 comprises sealed dish root end cover 17 and sealed packing outer loop 18, and two sealed dish root end cover 17 outsides set up sealed packing outer loop 18, and the contact surface between sealed packing outer loop 18 and the sealed dish root end cover 17 is the circular conical surface. The multi-stage annular sealing packing 300 and the single-stage annular sealing packing 400 can be made of rubber or resin materials, and the sealing effect is ensured.

The lower part of the joint 11 is an open cavity, a second distance ring 20 is arranged in the open cavity, the inner diameter of the second distance ring 20 is in clearance fit with the polished rod 2, and the outer diameter of the second distance ring 20 is in clearance fit with the joint 11. And a descaling ring 15 is arranged between the inner diameter of the second distance ring 20 and the polished rod 2. The housing 12 is rotated and the single-stage annular packing 400 is compressed to hold the polish rod 2 tightly when the closed cavity is reduced.

When the polish rod 2 and the polish rod sealer 200 are not coaxial, the polish rod spherical clip 8 is driven by the polish rod 2 to enable the spherical guide plate 6 to move horizontally, the ball group 5 achieves small play of the spherical guide plate 6, and the polish rod spherical clip 8 automatically aligns in motion due to the fact that the spherical structure of the polish rod spherical clip 8 is matched with the spherical structure of the spherical guide plate 6, so that the polish rod 2 can be always coaxial with the elastic polish rod sealer 200, and dynamic alignment of the polish rod 2 is achieved. The movable structure between the polished rod spherical clamp 8 and the pumping unit polished rod eye 1 provides a micro-motion space for the polished rod 2, reduces the phenomenon that the polished rod generates fatigue cracks, and prolongs the service life of the polished rod 2.

The utility model relates to an application method of polished rod seal assembly:

1. when the polished rod 2 is not centered with the polished rod sealer 200, the polished rod spherical clip 8 is driven by the polished rod 2 to enable the spherical guide plate 6 to horizontally move, and meanwhile, the outer spherical surface of the polished rod spherical clip 8 can automatically rotate to center, so that the polished rod 2 can be always coaxial with the elastic polished rod sealer 200.

2. The spherical clamp 8 of the polished rod is in interference fit with the polished rod 2, so that the mechanical damage and fatigue crack on the surface of the polished rod 2 can not be caused.

3. When the polish rod 2 is broken carelessly, the chain 10 can hang the upper part and the lower part of the polish rod formed after the polish rod 2 is broken on the polished rod eye 1 of the oil pumping unit, so that the leakage accident caused by the fact that the lower part of the polish rod formed after the polish rod 2 is broken falls into an oil well is avoided; the 'upper part of the polish rod' formed after the polish rod 2 is broken can be prevented from falling down from the air, so that the accidents of injury of people below and damage of equipment and facilities can be avoided.

4. The multistage annular seal packing 300 in the elastic polish rod sealer 200 plays a main sealing role, the single-stage annular seal packing 400 plays an auxiliary sealing role, the single-stage annular seal packing 400 is in a non-input state under normal working conditions, and when the multistage annular seal packing 300 needs to be replaced, the single-stage annular seal packing 400 can enter a working state by compressing the single-stage annular seal packing 400 through rotating the shell 12.

The utility model discloses a developments aligning polished rod checkpost structure has realized the developments aligning function, still has simple structure, long, the sexual valence relative altitude of sealed life, and the convenient characteristics of the sealed operation of main change on line can effectively be solved because of polished rod 2 and polished rod sealer 200 not centering and the emergence of accidents such as polished rod 2 fracture, liquid leakage in the pit that lead to.

Claims (8)

1. A polished rod sealing assembly comprises a dynamic self-aligning polished rod clip and a polished rod sealer, wherein the dynamic self-aligning polished rod clip is arranged on a polished rod eye of a pumping unit and is rigidly connected with a well head; the support ring is placed on the inner end face of the C-shaped seat, the ball group is installed on the support ring, the spherical guide plate is placed on the ball group, and a gap is reserved between the spherical guide plate and the C-shaped seat, so that the spherical guide plate can horizontally move; the spherical guide plate is in spherical fit with the spherical clamp of the polish rod; the inner hole of the spherical clamp of the polish rod is in interference fit with the polish rod;

the elastic polish rod sealer comprises a joint, a shell, a multi-stage annular sealing packing and a single-stage annular sealing packing; the lower end of the joint is fixedly connected with a wellhead, and the upper end of the joint is in threaded connection with the lower end of the shell; the upper end and the lower end of the shell are both provided with cavities, and the multistage annular sealing packing is arranged in the upper end cavity of the shell; the multistage annular sealing disc root consists of a sealing disc root end cover, a sealing packing outer ring and a sealing packing inner ring, wherein the inner walls of the sealing disc root end cover and the sealing packing inner ring are sleeved with a polished rod, the sealing packing outer ring is sleeved outside the sealing disc root end cover and the sealing packing inner ring, the contact surfaces of the sealing packing outer ring, the sealing disc root end cover and the sealing packing inner ring are conical surfaces, the sealing disc root end cover is arranged at two ends of the sealing packing inner ring, and more than one sealing packing inner ring is arranged; the single-stage annular sealing packing is arranged in a closed cavity formed by the lower end cavity of the shell and the upper part of the joint, the shell is rotated, and the single-stage annular sealing packing is compressed to hold the polished rod tightly when the closed cavity is reduced.

2. The polish rod seal assembly of claim 1, further comprising a sealing cylinder, a gland, a first distance ring and a descaling ring, wherein the sealing cylinder is placed in the upper end cavity of the housing and is fixedly connected with the housing through a bolt; the gland is arranged at the top of the sealing cylinder and is fixedly connected with the sealing cylinder through a screw; the descaling ring is arranged between the polished rod and the gland and is provided with a lip-shaped sealing body structure, and the inner diameter of the lip-shaped sealing body of the descaling ring is tightly matched with the polished rod; the first distance ring is placed below the descaling ring, the lower end of the first distance ring is flush with the lower end of the gland, the inner diameter of the first distance ring is in clearance fit with the polished rod, and the outer diameter of the first distance ring is in clearance fit with the gland; the multistage annular sealing packing is arranged in a space enclosed by the sealing cylinder and the gland.

3. The polish rod seal assembly of claim 1, wherein the single-stage annular packing gland is composed of a packing gland cover and a packing gland outer ring, the packing gland outer ring is arranged between the two packing gland covers, and the contact surface between the packing gland outer ring and the packing gland cover is a conical surface.

4. The polish rod sealing assembly of claim 1, further comprising a second distance ring, wherein the lower part of the joint is an open cavity, the second distance ring is arranged in the open cavity, the inner diameter of the second distance ring is in clearance fit with the polish rod, and the outer diameter of the second distance ring is in clearance fit with the joint.

5. The polish rod sealing assembly of claim 1, wherein the dynamic self-aligning polish rod clip further comprises a guide plate limiting seat fixed on the upper surface of the polished rod eye of the pumping unit, and the guide plate limiting seat is arranged outside the spherical guide plate to limit the axial and radial positions of the guide plate limiting seat.

6. The polish rod seal assembly of claim 1, wherein the upper portion of the spherical guide plate is of a concave spherical configuration and the bottom portion of the spherical polish rod clip is of a convex spherical configuration.

7. The polish rod seal assembly of claim 1, wherein the upper surface of the support ring is provided with a concave ring of balls.

8. The polish rod sealing assembly according to claim 1, further comprising a polish rod anti-drop clip, a chain, wherein the polish rod anti-drop clip is disposed under the beam hanger of the pumping unit, an inner hole of the polish rod anti-drop clip is in interference fit with the polish rod, one end of the chain is fixed on the polish rod anti-drop clip, and the other end of the chain is fixedly connected with the polish rod spherical clip.

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